1 /*
2 * Matroska file demuxer
3 * Copyright (c) 2003-2008 The FFmpeg Project
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Matroska file demuxer
25 * @author Ronald Bultje <rbultje@ronald.bitfreak.net>
26 * @author with a little help from Moritz Bunkus <moritz@bunkus.org>
27 * @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28 * @see specs available on the Matroska project page: http://www.matroska.org/
29 */
30
31 #include "config.h"
32
33 #include <inttypes.h>
34 #include <stdio.h>
35
36 #include "libavutil/avstring.h"
37 #include "libavutil/base64.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lzo.h"
42 #include "libavutil/mastering_display_metadata.h"
43 #include "libavutil/mathematics.h"
44 #include "libavutil/opt.h"
45 #include "libavutil/time_internal.h"
46 #include "libavutil/spherical.h"
47
48 #include "libavcodec/bytestream.h"
49 #include "libavcodec/flac.h"
50 #include "libavcodec/mpeg4audio.h"
51 #include "libavcodec/packet_internal.h"
52
53 #include "avformat.h"
54 #include "avio_internal.h"
55 #include "internal.h"
56 #include "isom.h"
57 #include "matroska.h"
58 #include "oggdec.h"
59 /* For ff_codec_get_id(). */
60 #include "riff.h"
61 #include "rmsipr.h"
62
63 #if CONFIG_BZLIB
64 #include <bzlib.h>
65 #endif
66 #if CONFIG_ZLIB
67 #include <zlib.h>
68 #endif
69
70 #include "qtpalette.h"
71
72 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
73 #define NEEDS_CHECKING 2 /* Indicates that some error checks
74 * still need to be performed */
75 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
76 * syntax level used for parsing ended. */
77 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
78 * of unkown, potentially damaged data is encountered,
79 * it is considered an error. */
80 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
81 * to this many bytes of unknown data for the
82 * SKIP_THRESHOLD check. */
83
84 typedef enum {
85 EBML_NONE,
86 EBML_UINT,
87 EBML_SINT,
88 EBML_FLOAT,
89 EBML_STR,
90 EBML_UTF8,
91 EBML_BIN,
92 EBML_NEST,
93 EBML_LEVEL1,
94 EBML_STOP,
95 EBML_TYPE_COUNT
96 } EbmlType;
97
98 typedef struct CountedElement {
99 union {
100 uint64_t u;
101 int64_t i;
102 double f;
103 char *s;
104 } el;
105 unsigned count;
106 } CountedElement;
107
108 typedef const struct EbmlSyntax {
109 uint32_t id;
110 uint8_t type;
111 uint8_t is_counted;
112 size_t list_elem_size;
113 size_t data_offset;
114 union {
115 int64_t i;
116 uint64_t u;
117 double f;
118 const char *s;
119 const struct EbmlSyntax *n;
120 } def;
121 } EbmlSyntax;
122
123 typedef struct EbmlList {
124 int nb_elem;
125 unsigned int alloc_elem_size;
126 void *elem;
127 } EbmlList;
128
129 typedef struct EbmlBin {
130 int size;
131 AVBufferRef *buf;
132 uint8_t *data;
133 int64_t pos;
134 } EbmlBin;
135
136 typedef struct Ebml {
137 uint64_t version;
138 uint64_t max_size;
139 uint64_t id_length;
140 char *doctype;
141 uint64_t doctype_version;
142 } Ebml;
143
144 typedef struct MatroskaTrackCompression {
145 uint64_t algo;
146 EbmlBin settings;
147 } MatroskaTrackCompression;
148
149 typedef struct MatroskaTrackEncryption {
150 uint64_t algo;
151 EbmlBin key_id;
152 } MatroskaTrackEncryption;
153
154 typedef struct MatroskaTrackEncoding {
155 uint64_t scope;
156 uint64_t type;
157 MatroskaTrackCompression compression;
158 MatroskaTrackEncryption encryption;
159 } MatroskaTrackEncoding;
160
161 typedef struct MatroskaMasteringMeta {
162 double r_x;
163 double r_y;
164 double g_x;
165 double g_y;
166 double b_x;
167 double b_y;
168 double white_x;
169 double white_y;
170 double max_luminance;
171 CountedElement min_luminance;
172 } MatroskaMasteringMeta;
173
174 typedef struct MatroskaTrackVideoColor {
175 uint64_t matrix_coefficients;
176 uint64_t bits_per_channel;
177 uint64_t chroma_sub_horz;
178 uint64_t chroma_sub_vert;
179 uint64_t cb_sub_horz;
180 uint64_t cb_sub_vert;
181 uint64_t chroma_siting_horz;
182 uint64_t chroma_siting_vert;
183 uint64_t range;
184 uint64_t transfer_characteristics;
185 uint64_t primaries;
186 uint64_t max_cll;
187 uint64_t max_fall;
188 MatroskaMasteringMeta mastering_meta;
189 } MatroskaTrackVideoColor;
190
191 typedef struct MatroskaTrackVideoProjection {
192 uint64_t type;
193 EbmlBin private;
194 double yaw;
195 double pitch;
196 double roll;
197 } MatroskaTrackVideoProjection;
198
199 typedef struct MatroskaTrackVideo {
200 double frame_rate;
201 uint64_t display_width;
202 uint64_t display_height;
203 uint64_t pixel_width;
204 uint64_t pixel_height;
205 EbmlBin color_space;
206 uint64_t display_unit;
207 uint64_t interlaced;
208 uint64_t field_order;
209 uint64_t stereo_mode;
210 uint64_t alpha_mode;
211 EbmlList color;
212 MatroskaTrackVideoProjection projection;
213 } MatroskaTrackVideo;
214
215 typedef struct MatroskaTrackAudio {
216 double samplerate;
217 double out_samplerate;
218 uint64_t bitdepth;
219 uint64_t channels;
220
221 /* real audio header (extracted from extradata) */
222 int coded_framesize;
223 int sub_packet_h;
224 int frame_size;
225 int sub_packet_size;
226 int sub_packet_cnt;
227 int pkt_cnt;
228 uint64_t buf_timecode;
229 uint8_t *buf;
230 } MatroskaTrackAudio;
231
232 typedef struct MatroskaTrackPlane {
233 uint64_t uid;
234 uint64_t type;
235 } MatroskaTrackPlane;
236
237 typedef struct MatroskaTrackOperation {
238 EbmlList combine_planes;
239 } MatroskaTrackOperation;
240
241 typedef struct MatroskaTrack {
242 uint64_t num;
243 uint64_t uid;
244 uint64_t type;
245 char *name;
246 char *codec_id;
247 EbmlBin codec_priv;
248 char *language;
249 double time_scale;
250 uint64_t default_duration;
251 uint64_t flag_default;
252 uint64_t flag_forced;
253 uint64_t flag_comment;
254 uint64_t flag_hearingimpaired;
255 uint64_t flag_visualimpaired;
256 uint64_t flag_textdescriptions;
257 CountedElement flag_original;
258 uint64_t seek_preroll;
259 MatroskaTrackVideo video;
260 MatroskaTrackAudio audio;
261 MatroskaTrackOperation operation;
262 EbmlList encodings;
263 uint64_t codec_delay;
264 uint64_t codec_delay_in_track_tb;
265
266 AVStream *stream;
267 int64_t end_timecode;
268 int ms_compat;
269 int needs_decoding;
270 uint64_t max_block_additional_id;
271
272 uint32_t palette[AVPALETTE_COUNT];
273 int has_palette;
274 } MatroskaTrack;
275
276 typedef struct MatroskaAttachment {
277 uint64_t uid;
278 char *filename;
279 char *description;
280 char *mime;
281 EbmlBin bin;
282
283 AVStream *stream;
284 } MatroskaAttachment;
285
286 typedef struct MatroskaChapter {
287 uint64_t start;
288 uint64_t end;
289 uint64_t uid;
290 char *title;
291
292 AVChapter *chapter;
293 } MatroskaChapter;
294
295 typedef struct MatroskaIndexPos {
296 uint64_t track;
297 uint64_t pos;
298 } MatroskaIndexPos;
299
300 typedef struct MatroskaIndex {
301 uint64_t time;
302 EbmlList pos;
303 } MatroskaIndex;
304
305 typedef struct MatroskaTag {
306 char *name;
307 char *string;
308 char *lang;
309 uint64_t def;
310 EbmlList sub;
311 } MatroskaTag;
312
313 typedef struct MatroskaTagTarget {
314 char *type;
315 uint64_t typevalue;
316 uint64_t trackuid;
317 uint64_t chapteruid;
318 uint64_t attachuid;
319 } MatroskaTagTarget;
320
321 typedef struct MatroskaTags {
322 MatroskaTagTarget target;
323 EbmlList tag;
324 } MatroskaTags;
325
326 typedef struct MatroskaSeekhead {
327 uint64_t id;
328 uint64_t pos;
329 } MatroskaSeekhead;
330
331 typedef struct MatroskaLevel {
332 uint64_t start;
333 uint64_t length;
334 } MatroskaLevel;
335
336 typedef struct MatroskaBlock {
337 uint64_t duration;
338 CountedElement reference;
339 uint64_t non_simple;
340 EbmlBin bin;
341 uint64_t additional_id;
342 EbmlBin additional;
343 int64_t discard_padding;
344 } MatroskaBlock;
345
346 typedef struct MatroskaCluster {
347 MatroskaBlock block;
348 uint64_t timecode;
349 int64_t pos;
350 } MatroskaCluster;
351
352 typedef struct MatroskaLevel1Element {
353 int64_t pos;
354 uint32_t id;
355 int parsed;
356 } MatroskaLevel1Element;
357
358 typedef struct MatroskaDemuxContext {
359 const AVClass *class;
360 AVFormatContext *ctx;
361
362 /* EBML stuff */
363 MatroskaLevel levels[EBML_MAX_DEPTH];
364 int num_levels;
365 uint32_t current_id;
366 int64_t resync_pos;
367 int unknown_count;
368
369 uint64_t time_scale;
370 double duration;
371 char *title;
372 char *muxingapp;
373 EbmlBin date_utc;
374 EbmlList tracks;
375 EbmlList attachments;
376 EbmlList chapters;
377 EbmlList index;
378 EbmlList tags;
379 EbmlList seekhead;
380
381 /* byte position of the segment inside the stream */
382 int64_t segment_start;
383
384 AVPacket *pkt;
385
386 /* the packet queue */
387 PacketList *queue;
388 PacketList *queue_end;
389
390 int done;
391
392 /* What to skip before effectively reading a packet. */
393 int skip_to_keyframe;
394 uint64_t skip_to_timecode;
395
396 /* File has a CUES element, but we defer parsing until it is needed. */
397 int cues_parsing_deferred;
398
399 /* Level1 elements and whether they were read yet */
400 MatroskaLevel1Element level1_elems[64];
401 int num_level1_elems;
402
403 MatroskaCluster current_cluster;
404
405 /* WebM DASH Manifest live flag */
406 int is_live;
407
408 /* Bandwidth value for WebM DASH Manifest */
409 int bandwidth;
410 } MatroskaDemuxContext;
411
412 #define CHILD_OF(parent) { .def = { .n = parent } }
413
414 // The following forward declarations need their size because
415 // a tentative definition with internal linkage must not be an
416 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
417 // Removing the sizes breaks MSVC.
418 static EbmlSyntax ebml_syntax[3], matroska_segment[9], matroska_track_video_color[15], matroska_track_video[19],
419 matroska_track[32], matroska_track_encoding[6], matroska_track_encodings[2],
420 matroska_track_combine_planes[2], matroska_track_operation[2], matroska_tracks[2],
421 matroska_attachments[2], matroska_chapter_entry[9], matroska_chapter[6], matroska_chapters[2],
422 matroska_index_entry[3], matroska_index[2], matroska_tag[3], matroska_tags[2], matroska_seekhead[2],
423 matroska_blockadditions[2], matroska_blockgroup[8], matroska_cluster_parsing[8];
424
425 static EbmlSyntax ebml_header[] = {
426 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
427 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, 0, offsetof(Ebml, max_size), { .u = 8 } },
428 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, 0, offsetof(Ebml, id_length), { .u = 4 } },
429 { EBML_ID_DOCTYPE, EBML_STR, 0, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
430 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
431 { EBML_ID_EBMLVERSION, EBML_NONE },
432 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
433 CHILD_OF(ebml_syntax)
434 };
435
436 static EbmlSyntax ebml_syntax[] = {
437 { EBML_ID_HEADER, EBML_NEST, 0, 0, 0, { .n = ebml_header } },
438 { MATROSKA_ID_SEGMENT, EBML_STOP },
439 { 0 }
440 };
441
442 static EbmlSyntax matroska_info[] = {
443 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
444 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, 0, offsetof(MatroskaDemuxContext, duration) },
445 { MATROSKA_ID_TITLE, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, title) },
446 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
447 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, muxingapp) },
448 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, 0, offsetof(MatroskaDemuxContext, date_utc) },
449 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
450 CHILD_OF(matroska_segment)
451 };
452
453 static EbmlSyntax matroska_mastering_meta[] = {
454 { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, r_x) },
455 { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, r_y) },
456 { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, g_x) },
457 { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, g_y) },
458 { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_x) },
459 { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_y) },
460 { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_x) },
461 { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_y) },
462 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 1, 0, offsetof(MatroskaMasteringMeta, min_luminance) },
463 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, max_luminance) },
464 CHILD_OF(matroska_track_video_color)
465 };
466
467 static EbmlSyntax matroska_track_video_color[] = {
468 { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
469 { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u = 0 } },
470 { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz) },
471 { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert) },
472 { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz) },
473 { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert) },
474 { MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u = MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED } },
475 { MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u = MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED } },
476 { MATROSKA_ID_VIDEOCOLORRANGE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, range), { .u = AVCOL_RANGE_UNSPECIFIED } },
477 { MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u = AVCOL_TRC_UNSPECIFIED } },
478 { MATROSKA_ID_VIDEOCOLORPRIMARIES, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u = AVCOL_PRI_UNSPECIFIED } },
479 { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_cll) },
480 { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_fall) },
481 { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
482 CHILD_OF(matroska_track_video)
483 };
484
485 static EbmlSyntax matroska_track_video_projection[] = {
486 { MATROSKA_ID_VIDEOPROJECTIONTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoProjection, type), { .u = MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR } },
487 { MATROSKA_ID_VIDEOPROJECTIONPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideoProjection, private) },
488 { MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f = 0.0 } },
489 { MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f = 0.0 } },
490 { MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f = 0.0 } },
491 CHILD_OF(matroska_track_video)
492 };
493
494 static EbmlSyntax matroska_track_video[] = {
495 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideo, frame_rate) },
496 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
497 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
498 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_width) },
499 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_height) },
500 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideo, color_space) },
501 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, alpha_mode), { .u = 0 } },
502 { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, 0, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
503 { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
504 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
505 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
506 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
507 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
508 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
509 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
510 { MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
511 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
512 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
513 CHILD_OF(matroska_track)
514 };
515
516 static EbmlSyntax matroska_track_audio[] = {
517 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
518 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
519 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, bitdepth) },
520 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
521 CHILD_OF(matroska_track)
522 };
523
524 static EbmlSyntax matroska_track_encoding_compression[] = {
525 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackCompression, algo), { .u = MATROSKA_TRACK_ENCODING_COMP_ZLIB } },
526 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, 0, offsetof(MatroskaTrackCompression, settings) },
527 CHILD_OF(matroska_track_encoding)
528 };
529
530 static EbmlSyntax matroska_track_encoding_encryption[] = {
531 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
532 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, 0, offsetof(MatroskaTrackEncryption,key_id) },
533 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
534 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
535 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
536 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
537 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
538 CHILD_OF(matroska_track_encoding)
539 };
540 static EbmlSyntax matroska_track_encoding[] = {
541 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
542 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
543 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
544 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
545 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
546 CHILD_OF(matroska_track_encodings)
547 };
548
549 static EbmlSyntax matroska_track_encodings[] = {
550 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, 0, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
551 CHILD_OF(matroska_track)
552 };
553
554 static EbmlSyntax matroska_track_plane[] = {
555 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, 0, offsetof(MatroskaTrackPlane,uid) },
556 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackPlane,type) },
557 CHILD_OF(matroska_track_combine_planes)
558 };
559
560 static EbmlSyntax matroska_track_combine_planes[] = {
561 { MATROSKA_ID_TRACKPLANE, EBML_NEST, 0, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
562 CHILD_OF(matroska_track_operation)
563 };
564
565 static EbmlSyntax matroska_track_operation[] = {
566 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, 0, {.n = matroska_track_combine_planes} },
567 CHILD_OF(matroska_track)
568 };
569
570 static EbmlSyntax matroska_track[] = {
571 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, 0, offsetof(MatroskaTrack, num) },
572 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTrack, name) },
573 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, uid) },
574 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrack, type) },
575 { MATROSKA_ID_CODECID, EBML_STR, 0, 0, offsetof(MatroskaTrack, codec_id) },
576 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrack, codec_priv) },
577 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, codec_delay), { .u = 0 } },
578 { MATROSKA_ID_TRACKLANGUAGE, EBML_STR, 0, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
579 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, 0, offsetof(MatroskaTrack, default_duration) },
580 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
581 { MATROSKA_ID_TRACKFLAGCOMMENTARY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_comment), { .u = 0 } },
582 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
583 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
584 { MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_hearingimpaired), { .u = 0 } },
585 { MATROSKA_ID_TRACKFLAGVISUALIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_visualimpaired), { .u = 0 } },
586 { MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_textdescriptions), { .u = 0 } },
587 { MATROSKA_ID_TRACKFLAGORIGINAL, EBML_UINT, 1, 0, offsetof(MatroskaTrack, flag_original), {.u = 0 } },
588 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
589 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
590 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
591 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, 0, { .n = matroska_track_encodings } },
592 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, max_block_additional_id), { .u = 0 } },
593 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, 0, offsetof(MatroskaTrack, seek_preroll), { .u = 0 } },
594 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
595 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
596 { MATROSKA_ID_CODECNAME, EBML_NONE },
597 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
598 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
599 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
600 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
601 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
602 CHILD_OF(matroska_tracks)
603 };
604
605 static EbmlSyntax matroska_tracks[] = {
606 { MATROSKA_ID_TRACKENTRY, EBML_NEST, 0, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
607 CHILD_OF(matroska_segment)
608 };
609
610 static EbmlSyntax matroska_attachment[] = {
611 { MATROSKA_ID_FILEUID, EBML_UINT, 0, 0, offsetof(MatroskaAttachment, uid) },
612 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, filename) },
613 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, 0, offsetof(MatroskaAttachment, mime) },
614 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, 0, offsetof(MatroskaAttachment, bin) },
615 { MATROSKA_ID_FILEDESC, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, description) },
616 CHILD_OF(matroska_attachments)
617 };
618
619 static EbmlSyntax matroska_attachments[] = {
620 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, 0, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
621 CHILD_OF(matroska_segment)
622 };
623
624 static EbmlSyntax matroska_chapter_display[] = {
625 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaChapter, title) },
626 { MATROSKA_ID_CHAPLANG, EBML_NONE },
627 { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
628 CHILD_OF(matroska_chapter_entry)
629 };
630
631 static EbmlSyntax matroska_chapter_entry[] = {
632 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
633 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
634 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaChapter, uid) },
635 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter_display } },
636 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
637 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
638 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
639 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
640 CHILD_OF(matroska_chapter)
641 };
642
643 static EbmlSyntax matroska_chapter[] = {
644 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, 0, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
645 { MATROSKA_ID_EDITIONUID, EBML_NONE },
646 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
647 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
648 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
649 CHILD_OF(matroska_chapters)
650 };
651
652 static EbmlSyntax matroska_chapters[] = {
653 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter } },
654 CHILD_OF(matroska_segment)
655 };
656
657 static EbmlSyntax matroska_index_pos[] = {
658 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, track) },
659 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, pos) },
660 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
661 { MATROSKA_ID_CUEDURATION, EBML_NONE },
662 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
663 CHILD_OF(matroska_index_entry)
664 };
665
666 static EbmlSyntax matroska_index_entry[] = {
667 { MATROSKA_ID_CUETIME, EBML_UINT, 0, 0, offsetof(MatroskaIndex, time) },
668 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, 0, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
669 CHILD_OF(matroska_index)
670 };
671
672 static EbmlSyntax matroska_index[] = {
673 { MATROSKA_ID_POINTENTRY, EBML_NEST, 0, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
674 CHILD_OF(matroska_segment)
675 };
676
677 static EbmlSyntax matroska_simpletag[] = {
678 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTag, name) },
679 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaTag, string) },
680 { MATROSKA_ID_TAGLANG, EBML_STR, 0, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
681 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
682 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
683 { MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
684 CHILD_OF(matroska_tag)
685 };
686
687 static EbmlSyntax matroska_tagtargets[] = {
688 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, 0, offsetof(MatroskaTagTarget, type) },
689 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
690 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, trackuid), { .u = 0 } },
691 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, chapteruid), { .u = 0 } },
692 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, attachuid), { .u = 0 } },
693 CHILD_OF(matroska_tag)
694 };
695
696 static EbmlSyntax matroska_tag[] = {
697 { MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
698 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
699 CHILD_OF(matroska_tags)
700 };
701
702 static EbmlSyntax matroska_tags[] = {
703 { MATROSKA_ID_TAG, EBML_NEST, 0, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
704 CHILD_OF(matroska_segment)
705 };
706
707 static EbmlSyntax matroska_seekhead_entry[] = {
708 { MATROSKA_ID_SEEKID, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, id) },
709 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
710 CHILD_OF(matroska_seekhead)
711 };
712
713 static EbmlSyntax matroska_seekhead[] = {
714 { MATROSKA_ID_SEEKENTRY, EBML_NEST, 0, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
715 CHILD_OF(matroska_segment)
716 };
717
718 static EbmlSyntax matroska_segment[] = {
719 { MATROSKA_ID_CLUSTER, EBML_STOP },
720 { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, 0, { .n = matroska_info } },
721 { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tracks } },
722 { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_attachments } },
723 { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_chapters } },
724 { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, 0, { .n = matroska_index } },
725 { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tags } },
726 { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, 0, { .n = matroska_seekhead } },
727 { 0 } /* We don't want to go back to level 0, so don't add the parent. */
728 };
729
730 static EbmlSyntax matroska_segments[] = {
731 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, 0, { .n = matroska_segment } },
732 { 0 }
733 };
734
735 static EbmlSyntax matroska_blockmore[] = {
736 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
737 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, 0, offsetof(MatroskaBlock,additional) },
738 CHILD_OF(matroska_blockadditions)
739 };
740
741 static EbmlSyntax matroska_blockadditions[] = {
742 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, 0, {.n = matroska_blockmore} },
743 CHILD_OF(matroska_blockgroup)
744 };
745
746 static EbmlSyntax matroska_blockgroup[] = {
747 { MATROSKA_ID_BLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
748 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, 0, { .n = matroska_blockadditions} },
749 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, 0, offsetof(MatroskaBlock, duration) },
750 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, 0, offsetof(MatroskaBlock, discard_padding) },
751 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 1, 0, offsetof(MatroskaBlock, reference) },
752 { MATROSKA_ID_CODECSTATE, EBML_NONE },
753 { 1, EBML_UINT, 0, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
754 CHILD_OF(matroska_cluster_parsing)
755 };
756
757 // The following array contains SimpleBlock and BlockGroup twice
758 // in order to reuse the other values for matroska_cluster_enter.
759 static EbmlSyntax matroska_cluster_parsing[] = {
760 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
761 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, 0, { .n = matroska_blockgroup } },
762 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, 0, offsetof(MatroskaCluster, timecode) },
763 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
764 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
765 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
766 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
767 CHILD_OF(matroska_segment)
768 };
769
770 static EbmlSyntax matroska_cluster_enter[] = {
771 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, 0, { .n = &matroska_cluster_parsing[2] } },
772 { 0 }
773 };
774 #undef CHILD_OF
775
776 static const CodecMime mkv_image_mime_tags[] = {
777 {"image/gif" , AV_CODEC_ID_GIF},
778 {"image/jpeg" , AV_CODEC_ID_MJPEG},
779 {"image/png" , AV_CODEC_ID_PNG},
780 {"image/tiff" , AV_CODEC_ID_TIFF},
781
782 {"" , AV_CODEC_ID_NONE}
783 };
784
785 static const CodecMime mkv_mime_tags[] = {
786 {"text/plain" , AV_CODEC_ID_TEXT},
787 {"application/x-truetype-font", AV_CODEC_ID_TTF},
788 {"application/x-font" , AV_CODEC_ID_TTF},
789 {"application/vnd.ms-opentype", AV_CODEC_ID_OTF},
790 {"binary" , AV_CODEC_ID_BIN_DATA},
791
792 {"" , AV_CODEC_ID_NONE}
793 };
794
795 static const char *const matroska_doctypes[] = { "matroska", "webm" };
796
797 static int matroska_read_close(AVFormatContext *s);
798
799 /*
800 * This function prepares the status for parsing of level 1 elements.
801 */
matroska_reset_status(MatroskaDemuxContext * matroska,uint32_t id,int64_t position)802 static int matroska_reset_status(MatroskaDemuxContext *matroska,
803 uint32_t id, int64_t position)
804 {
805 int64_t err = 0;
806 if (position >= 0) {
807 err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
808 if (err > 0)
809 err = 0;
810 } else
811 position = avio_tell(matroska->ctx->pb);
812
813 matroska->current_id = id;
814 matroska->num_levels = 1;
815 matroska->unknown_count = 0;
816 matroska->resync_pos = position;
817 if (id)
818 matroska->resync_pos -= (av_log2(id) + 7) / 8;
819
820 return err;
821 }
822
matroska_resync(MatroskaDemuxContext * matroska,int64_t last_pos)823 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
824 {
825 AVIOContext *pb = matroska->ctx->pb;
826 uint32_t id;
827
828 /* Try to seek to the last position to resync from. If this doesn't work,
829 * we resync from the earliest position available: The start of the buffer. */
830 if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
831 av_log(matroska->ctx, AV_LOG_WARNING,
832 "Seek to desired resync point failed. Seeking to "
833 "earliest point available instead.\n");
834 avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
835 last_pos + 1), SEEK_SET);
836 }
837
838 id = avio_rb32(pb);
839
840 // try to find a toplevel element
841 while (!avio_feof(pb)) {
842 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
843 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
844 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
845 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
846 /* Prepare the context for parsing of a level 1 element. */
847 matroska_reset_status(matroska, id, -1);
848 /* Given that we are here means that an error has occurred,
849 * so treat the segment as unknown length in order not to
850 * discard valid data that happens to be beyond the designated
851 * end of the segment. */
852 matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
853 return 0;
854 }
855 id = (id << 8) | avio_r8(pb);
856 }
857
858 matroska->done = 1;
859 return pb->error ? pb->error : AVERROR_EOF;
860 }
861
862 /*
863 * Read: an "EBML number", which is defined as a variable-length
864 * array of bytes. The first byte indicates the length by giving a
865 * number of 0-bits followed by a one. The position of the first
866 * "one" bit inside the first byte indicates the length of this
867 * number.
868 * Returns: number of bytes read, < 0 on error
869 */
ebml_read_num(MatroskaDemuxContext * matroska,AVIOContext * pb,int max_size,uint64_t * number,int eof_forbidden)870 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
871 int max_size, uint64_t *number, int eof_forbidden)
872 {
873 int read, n = 1;
874 uint64_t total;
875 int64_t pos;
876
877 /* The first byte tells us the length in bytes - except when it is zero. */
878 total = avio_r8(pb);
879 if (pb->eof_reached)
880 goto err;
881
882 /* get the length of the EBML number */
883 read = 8 - ff_log2_tab[total];
884
885 if (!total || read > max_size) {
886 pos = avio_tell(pb) - 1;
887 if (!total) {
888 av_log(matroska->ctx, AV_LOG_ERROR,
889 "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
890 "of an EBML number\n", pos, pos);
891 } else {
892 av_log(matroska->ctx, AV_LOG_ERROR,
893 "Length %d indicated by an EBML number's first byte 0x%02x "
894 "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
895 read, (uint8_t) total, pos, pos, max_size);
896 }
897 return AVERROR_INVALIDDATA;
898 }
899
900 /* read out length */
901 total ^= 1 << ff_log2_tab[total];
902 while (n++ < read)
903 total = (total << 8) | avio_r8(pb);
904
905 if (pb->eof_reached) {
906 eof_forbidden = 1;
907 goto err;
908 }
909
910 *number = total;
911
912 return read;
913
914 err:
915 pos = avio_tell(pb);
916 if (pb->error) {
917 av_log(matroska->ctx, AV_LOG_ERROR,
918 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
919 pos, pos);
920 return pb->error;
921 }
922 if (eof_forbidden) {
923 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
924 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
925 return AVERROR(EIO);
926 }
927 return AVERROR_EOF;
928 }
929
930 /**
931 * Read a EBML length value.
932 * This needs special handling for the "unknown length" case which has multiple
933 * encodings.
934 */
ebml_read_length(MatroskaDemuxContext * matroska,AVIOContext * pb,uint64_t * number)935 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
936 uint64_t *number)
937 {
938 int res = ebml_read_num(matroska, pb, 8, number, 1);
939 if (res > 0 && *number + 1 == 1ULL << (7 * res))
940 *number = EBML_UNKNOWN_LENGTH;
941 return res;
942 }
943
944 /*
945 * Read the next element as an unsigned int.
946 * Returns NEEDS_CHECKING unless size == 0.
947 */
ebml_read_uint(AVIOContext * pb,int size,uint64_t default_value,uint64_t * num)948 static int ebml_read_uint(AVIOContext *pb, int size,
949 uint64_t default_value, uint64_t *num)
950 {
951 int n = 0;
952
953 if (size == 0) {
954 *num = default_value;
955 return 0;
956 }
957 /* big-endian ordering; build up number */
958 *num = 0;
959 while (n++ < size)
960 *num = (*num << 8) | avio_r8(pb);
961
962 return NEEDS_CHECKING;
963 }
964
965 /*
966 * Read the next element as a signed int.
967 * Returns NEEDS_CHECKING unless size == 0.
968 */
ebml_read_sint(AVIOContext * pb,int size,int64_t default_value,int64_t * num)969 static int ebml_read_sint(AVIOContext *pb, int size,
970 int64_t default_value, int64_t *num)
971 {
972 int n = 1;
973
974 if (size == 0) {
975 *num = default_value;
976 return 0;
977 } else {
978 *num = sign_extend(avio_r8(pb), 8);
979
980 /* big-endian ordering; build up number */
981 while (n++ < size)
982 *num = ((uint64_t)*num << 8) | avio_r8(pb);
983 }
984
985 return NEEDS_CHECKING;
986 }
987
988 /*
989 * Read the next element as a float.
990 * Returns 0 if size == 0, NEEDS_CHECKING or < 0 on obvious failure.
991 */
ebml_read_float(AVIOContext * pb,int size,double default_value,double * num)992 static int ebml_read_float(AVIOContext *pb, int size,
993 double default_value, double *num)
994 {
995 if (size == 0) {
996 *num = default_value;
997 return 0;
998 } else if (size == 4) {
999 *num = av_int2float(avio_rb32(pb));
1000 } else if (size == 8) {
1001 *num = av_int2double(avio_rb64(pb));
1002 } else
1003 return AVERROR_INVALIDDATA;
1004
1005 return NEEDS_CHECKING;
1006 }
1007
1008 /*
1009 * Read the next element as an ASCII string.
1010 * 0 is success, < 0 or NEEDS_CHECKING is failure.
1011 */
ebml_read_ascii(AVIOContext * pb,int size,const char * default_value,char ** str)1012 static int ebml_read_ascii(AVIOContext *pb, int size,
1013 const char *default_value, char **str)
1014 {
1015 char *res;
1016 int ret;
1017
1018 if (size == 0 && default_value) {
1019 res = av_strdup(default_value);
1020 if (!res)
1021 return AVERROR(ENOMEM);
1022 } else {
1023 /* EBML strings are usually not 0-terminated, so we allocate one
1024 * byte more, read the string and NUL-terminate it ourselves. */
1025 if (!(res = av_malloc(size + 1)))
1026 return AVERROR(ENOMEM);
1027 if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
1028 av_free(res);
1029 return ret < 0 ? ret : NEEDS_CHECKING;
1030 }
1031 (res)[size] = '\0';
1032 }
1033 av_free(*str);
1034 *str = res;
1035
1036 return 0;
1037 }
1038
1039 /*
1040 * Read the next element as binary data.
1041 * 0 is success, < 0 or NEEDS_CHECKING is failure.
1042 */
ebml_read_binary(AVIOContext * pb,int length,int64_t pos,EbmlBin * bin)1043 static int ebml_read_binary(AVIOContext *pb, int length,
1044 int64_t pos, EbmlBin *bin)
1045 {
1046 int ret;
1047
1048 ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
1049 if (ret < 0)
1050 return ret;
1051 memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1052
1053 bin->data = bin->buf->data;
1054 bin->size = length;
1055 bin->pos = pos;
1056 if ((ret = avio_read(pb, bin->data, length)) != length) {
1057 av_buffer_unref(&bin->buf);
1058 bin->data = NULL;
1059 bin->size = 0;
1060 return ret < 0 ? ret : NEEDS_CHECKING;
1061 }
1062
1063 return 0;
1064 }
1065
1066 /*
1067 * Read the next element, but only the header. The contents
1068 * are supposed to be sub-elements which can be read separately.
1069 * 0 is success, < 0 is failure.
1070 */
ebml_read_master(MatroskaDemuxContext * matroska,uint64_t length,int64_t pos)1071 static int ebml_read_master(MatroskaDemuxContext *matroska,
1072 uint64_t length, int64_t pos)
1073 {
1074 MatroskaLevel *level;
1075
1076 if (matroska->num_levels >= EBML_MAX_DEPTH) {
1077 av_log(matroska->ctx, AV_LOG_ERROR,
1078 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1079 return AVERROR(ENOSYS);
1080 }
1081
1082 level = &matroska->levels[matroska->num_levels++];
1083 level->start = pos;
1084 level->length = length;
1085
1086 return 0;
1087 }
1088
1089 /*
1090 * Read a signed "EBML number"
1091 * Return: number of bytes processed, < 0 on error
1092 */
matroska_ebmlnum_sint(MatroskaDemuxContext * matroska,AVIOContext * pb,int64_t * num)1093 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
1094 AVIOContext *pb, int64_t *num)
1095 {
1096 uint64_t unum;
1097 int res;
1098
1099 /* read as unsigned number first */
1100 if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1101 return res;
1102
1103 /* make signed (weird way) */
1104 *num = unum - ((1LL << (7 * res - 1)) - 1);
1105
1106 return res;
1107 }
1108
1109 static int ebml_parse(MatroskaDemuxContext *matroska,
1110 EbmlSyntax *syntax, void *data);
1111
ebml_parse_id(EbmlSyntax * syntax,uint32_t id)1112 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1113 {
1114 int i;
1115
1116 // Whoever touches this should be aware of the duplication
1117 // existing in matroska_cluster_parsing.
1118 for (i = 0; syntax[i].id; i++)
1119 if (id == syntax[i].id)
1120 break;
1121
1122 return &syntax[i];
1123 }
1124
ebml_parse_nest(MatroskaDemuxContext * matroska,EbmlSyntax * syntax,void * data)1125 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1126 void *data)
1127 {
1128 int res;
1129
1130 if (data) {
1131 for (int i = 0; syntax[i].id; i++) {
1132 void *dst = (char *)data + syntax[i].data_offset;
1133 switch (syntax[i].type) {
1134 case EBML_UINT:
1135 *(uint64_t *)dst = syntax[i].def.u;
1136 break;
1137 case EBML_SINT:
1138 *(int64_t *) dst = syntax[i].def.i;
1139 break;
1140 case EBML_FLOAT:
1141 *(double *) dst = syntax[i].def.f;
1142 break;
1143 case EBML_STR:
1144 case EBML_UTF8:
1145 // the default may be NULL
1146 if (syntax[i].def.s) {
1147 *(char**)dst = av_strdup(syntax[i].def.s);
1148 if (!*(char**)dst)
1149 return AVERROR(ENOMEM);
1150 }
1151 break;
1152 }
1153 }
1154
1155 if (!matroska->levels[matroska->num_levels - 1].length) {
1156 matroska->num_levels--;
1157 return 0;
1158 }
1159 }
1160
1161 do {
1162 res = ebml_parse(matroska, syntax, data);
1163 } while (!res);
1164
1165 return res == LEVEL_ENDED ? 0 : res;
1166 }
1167
is_ebml_id_valid(uint32_t id)1168 static int is_ebml_id_valid(uint32_t id)
1169 {
1170 // Due to endian nonsense in Matroska, the highest byte with any bits set
1171 // will contain the leading length bit. This bit in turn identifies the
1172 // total byte length of the element by its position within the byte.
1173 unsigned int bits = av_log2(id);
1174 return id && (bits + 7) / 8 == (8 - bits % 8);
1175 }
1176
1177 /*
1178 * Allocate and return the entry for the level1 element with the given ID. If
1179 * an entry already exists, return the existing entry.
1180 */
matroska_find_level1_elem(MatroskaDemuxContext * matroska,uint32_t id,int64_t pos)1181 static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
1182 uint32_t id, int64_t pos)
1183 {
1184 int i;
1185 MatroskaLevel1Element *elem;
1186
1187 if (!is_ebml_id_valid(id))
1188 return NULL;
1189
1190 // Some files link to all clusters; useless.
1191 if (id == MATROSKA_ID_CLUSTER)
1192 return NULL;
1193
1194 // There can be multiple SeekHeads and Tags.
1195 for (i = 0; i < matroska->num_level1_elems; i++) {
1196 if (matroska->level1_elems[i].id == id) {
1197 if (matroska->level1_elems[i].pos == pos ||
1198 id != MATROSKA_ID_SEEKHEAD && id != MATROSKA_ID_TAGS)
1199 return &matroska->level1_elems[i];
1200 }
1201 }
1202
1203 // Only a completely broken file would have more elements.
1204 if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1205 av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements.\n");
1206 return NULL;
1207 }
1208
1209 elem = &matroska->level1_elems[matroska->num_level1_elems++];
1210 *elem = (MatroskaLevel1Element){.id = id};
1211
1212 return elem;
1213 }
1214
ebml_parse(MatroskaDemuxContext * matroska,EbmlSyntax * syntax,void * data)1215 static int ebml_parse(MatroskaDemuxContext *matroska,
1216 EbmlSyntax *syntax, void *data)
1217 {
1218 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1219 // Forbid unknown-length EBML_NONE elements.
1220 [EBML_NONE] = EBML_UNKNOWN_LENGTH - 1,
1221 [EBML_UINT] = 8,
1222 [EBML_SINT] = 8,
1223 [EBML_FLOAT] = 8,
1224 // max. 16 MB for strings
1225 [EBML_STR] = 0x1000000,
1226 [EBML_UTF8] = 0x1000000,
1227 // max. 256 MB for binary data
1228 [EBML_BIN] = 0x10000000,
1229 // no limits for anything else
1230 };
1231 AVIOContext *pb = matroska->ctx->pb;
1232 uint32_t id;
1233 uint64_t length;
1234 int64_t pos = avio_tell(pb), pos_alt;
1235 int res, update_pos = 1, level_check;
1236 MatroskaLevel1Element *level1_elem;
1237 MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1238
1239 if (!matroska->current_id) {
1240 uint64_t id;
1241 res = ebml_read_num(matroska, pb, 4, &id, 0);
1242 if (res < 0) {
1243 if (pb->eof_reached && res == AVERROR_EOF) {
1244 if (matroska->is_live)
1245 // in live mode, finish parsing if EOF is reached.
1246 return 1;
1247 if (level && pos == avio_tell(pb)) {
1248 if (level->length == EBML_UNKNOWN_LENGTH) {
1249 // Unknown-length levels automatically end at EOF.
1250 matroska->num_levels--;
1251 return LEVEL_ENDED;
1252 } else {
1253 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1254 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1255 }
1256 }
1257 }
1258 return res;
1259 }
1260 matroska->current_id = id | 1 << 7 * res;
1261 pos_alt = pos + res;
1262 } else {
1263 pos_alt = pos;
1264 pos -= (av_log2(matroska->current_id) + 7) / 8;
1265 }
1266
1267 id = matroska->current_id;
1268
1269 syntax = ebml_parse_id(syntax, id);
1270 if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1271 if (level && level->length == EBML_UNKNOWN_LENGTH) {
1272 // Unknown-length levels end when an element from an upper level
1273 // in the hierarchy is encountered.
1274 while (syntax->def.n) {
1275 syntax = ebml_parse_id(syntax->def.n, id);
1276 if (syntax->id) {
1277 matroska->num_levels--;
1278 return LEVEL_ENDED;
1279 }
1280 };
1281 }
1282
1283 av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1284 "%"PRId64"\n", id, pos);
1285 update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1286 }
1287
1288 if (data) {
1289 data = (char *) data + syntax->data_offset;
1290 if (syntax->list_elem_size) {
1291 EbmlList *list = data;
1292 void *newelem;
1293
1294 if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1295 return AVERROR(ENOMEM);
1296 newelem = av_fast_realloc(list->elem,
1297 &list->alloc_elem_size,
1298 (list->nb_elem + 1) * syntax->list_elem_size);
1299 if (!newelem)
1300 return AVERROR(ENOMEM);
1301 list->elem = newelem;
1302 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1303 memset(data, 0, syntax->list_elem_size);
1304 list->nb_elem++;
1305 }
1306 }
1307
1308 if (syntax->type != EBML_STOP) {
1309 matroska->current_id = 0;
1310 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1311 return res;
1312
1313 pos_alt += res;
1314
1315 if (matroska->num_levels > 0) {
1316 if (length != EBML_UNKNOWN_LENGTH &&
1317 level->length != EBML_UNKNOWN_LENGTH) {
1318 uint64_t elem_end = pos_alt + length,
1319 level_end = level->start + level->length;
1320
1321 if (elem_end < level_end) {
1322 level_check = 0;
1323 } else if (elem_end == level_end) {
1324 level_check = LEVEL_ENDED;
1325 } else {
1326 av_log(matroska->ctx, AV_LOG_ERROR,
1327 "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1328 "containing master element ending at 0x%"PRIx64"\n",
1329 pos, elem_end, level_end);
1330 return AVERROR_INVALIDDATA;
1331 }
1332 } else if (length != EBML_UNKNOWN_LENGTH) {
1333 level_check = 0;
1334 } else if (level->length != EBML_UNKNOWN_LENGTH) {
1335 av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1336 "at 0x%"PRIx64" inside parent with finite size\n", pos);
1337 return AVERROR_INVALIDDATA;
1338 } else {
1339 level_check = 0;
1340 if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1341 || syntax->type == EBML_NEST)) {
1342 // According to the current specifications only clusters and
1343 // segments are allowed to be unknown-length. We also accept
1344 // other unknown-length master elements.
1345 av_log(matroska->ctx, AV_LOG_WARNING,
1346 "Found unknown-length element 0x%"PRIX32" other than "
1347 "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1348 "parsing will nevertheless be attempted.\n", id, pos);
1349 update_pos = -1;
1350 }
1351 }
1352 } else
1353 level_check = 0;
1354
1355 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1356 if (length != EBML_UNKNOWN_LENGTH) {
1357 av_log(matroska->ctx, AV_LOG_ERROR,
1358 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1359 "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1360 length, max_lengths[syntax->type], id, pos);
1361 } else if (syntax->type != EBML_NONE) {
1362 av_log(matroska->ctx, AV_LOG_ERROR,
1363 "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1364 "unknown length, yet the length of an element of its "
1365 "type must be known.\n", id, pos);
1366 } else {
1367 av_log(matroska->ctx, AV_LOG_ERROR,
1368 "Found unknown-length element with ID 0x%"PRIX32" at "
1369 "pos. 0x%"PRIx64" for which no syntax for parsing is "
1370 "available.\n", id, pos);
1371 }
1372 return AVERROR_INVALIDDATA;
1373 }
1374
1375 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1376 // Loosing sync will likely manifest itself as encountering unknown
1377 // elements which are not reliably distinguishable from elements
1378 // belonging to future extensions of the format.
1379 // We use a heuristic to detect such situations: If the current
1380 // element is not expected at the current syntax level and there
1381 // were only a few unknown elements in a row, then the element is
1382 // skipped or considered defective based upon the length of the
1383 // current element (i.e. how much would be skipped); if there were
1384 // more than a few skipped elements in a row and skipping the current
1385 // element would lead us more than SKIP_THRESHOLD away from the last
1386 // known good position, then it is inferred that an error occurred.
1387 // The dependency on the number of unknown elements in a row exists
1388 // because the distance to the last known good position is
1389 // automatically big if the last parsed element was big.
1390 // In both cases, each unknown element is considered equivalent to
1391 // UNKNOWN_EQUIV of skipped bytes for the check.
1392 // The whole check is only done for non-seekable output, because
1393 // in this situation skipped data can't simply be rechecked later.
1394 // This is especially important when using unkown length elements
1395 // as the check for whether a child exceeds its containing master
1396 // element is not effective in this situation.
1397 if (update_pos) {
1398 matroska->unknown_count = 0;
1399 } else {
1400 int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1401
1402 if (matroska->unknown_count > 3)
1403 dist += pos_alt - matroska->resync_pos;
1404
1405 if (dist > SKIP_THRESHOLD) {
1406 av_log(matroska->ctx, AV_LOG_ERROR,
1407 "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1408 "length 0x%"PRIx64" considered as invalid data. Last "
1409 "known good position 0x%"PRIx64", %d unknown elements"
1410 " in a row\n", id, pos, length, matroska->resync_pos,
1411 matroska->unknown_count);
1412 return AVERROR_INVALIDDATA;
1413 }
1414 }
1415 }
1416
1417 if (update_pos > 0) {
1418 // We have found an element that is allowed at this place
1419 // in the hierarchy and it passed all checks, so treat the beginning
1420 // of the element as the "last known good" position.
1421 matroska->resync_pos = pos;
1422 }
1423
1424 if (!data && length != EBML_UNKNOWN_LENGTH)
1425 goto skip;
1426 }
1427
1428 switch (syntax->type) {
1429 case EBML_UINT:
1430 res = ebml_read_uint(pb, length, syntax->def.u, data);
1431 break;
1432 case EBML_SINT:
1433 res = ebml_read_sint(pb, length, syntax->def.i, data);
1434 break;
1435 case EBML_FLOAT:
1436 res = ebml_read_float(pb, length, syntax->def.f, data);
1437 break;
1438 case EBML_STR:
1439 case EBML_UTF8:
1440 res = ebml_read_ascii(pb, length, syntax->def.s, data);
1441 break;
1442 case EBML_BIN:
1443 res = ebml_read_binary(pb, length, pos_alt, data);
1444 break;
1445 case EBML_LEVEL1:
1446 case EBML_NEST:
1447 if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1448 return res;
1449 if (id == MATROSKA_ID_SEGMENT)
1450 matroska->segment_start = pos_alt;
1451 if (id == MATROSKA_ID_CUES)
1452 matroska->cues_parsing_deferred = 0;
1453 if (syntax->type == EBML_LEVEL1 &&
1454 (level1_elem = matroska_find_level1_elem(matroska, syntax->id, pos))) {
1455 if (!level1_elem->pos) {
1456 // Zero is not a valid position for a level 1 element.
1457 level1_elem->pos = pos;
1458 } else if (level1_elem->pos != pos)
1459 av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1460 level1_elem->parsed = 1;
1461 }
1462 if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1463 return res;
1464 break;
1465 case EBML_STOP:
1466 return 1;
1467 skip:
1468 default:
1469 if (length) {
1470 int64_t res2;
1471 if (ffio_limit(pb, length) != length) {
1472 // ffio_limit emits its own error message,
1473 // so we don't have to.
1474 return AVERROR(EIO);
1475 }
1476 if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1477 // avio_skip might take us past EOF. We check for this
1478 // by skipping only length - 1 bytes, reading a byte and
1479 // checking the error flags. This is done in order to check
1480 // that the element has been properly skipped even when
1481 // no filesize (that ffio_limit relies on) is available.
1482 avio_r8(pb);
1483 res = NEEDS_CHECKING;
1484 } else
1485 res = res2;
1486 } else
1487 res = 0;
1488 }
1489 if (res) {
1490 if (res == NEEDS_CHECKING) {
1491 if (pb->eof_reached) {
1492 if (pb->error)
1493 res = pb->error;
1494 else
1495 res = AVERROR_EOF;
1496 } else
1497 goto level_check;
1498 }
1499
1500 if (res == AVERROR_INVALIDDATA)
1501 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1502 else if (res == AVERROR(EIO))
1503 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1504 else if (res == AVERROR_EOF) {
1505 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1506 res = AVERROR(EIO);
1507 }
1508
1509 return res;
1510 }
1511
1512 level_check:
1513 if (syntax->is_counted && data) {
1514 CountedElement *elem = data;
1515 if (elem->count != UINT_MAX)
1516 elem->count++;
1517 }
1518
1519 if (level_check == LEVEL_ENDED && matroska->num_levels) {
1520 level = &matroska->levels[matroska->num_levels - 1];
1521 pos = avio_tell(pb);
1522
1523 // Given that pos >= level->start no check for
1524 // level->length != EBML_UNKNOWN_LENGTH is necessary.
1525 while (matroska->num_levels && pos == level->start + level->length) {
1526 matroska->num_levels--;
1527 level--;
1528 }
1529 }
1530
1531 return level_check;
1532 }
1533
ebml_free(EbmlSyntax * syntax,void * data)1534 static void ebml_free(EbmlSyntax *syntax, void *data)
1535 {
1536 int i, j;
1537 for (i = 0; syntax[i].id; i++) {
1538 void *data_off = (char *) data + syntax[i].data_offset;
1539 switch (syntax[i].type) {
1540 case EBML_STR:
1541 case EBML_UTF8:
1542 av_freep(data_off);
1543 break;
1544 case EBML_BIN:
1545 av_buffer_unref(&((EbmlBin *) data_off)->buf);
1546 break;
1547 case EBML_LEVEL1:
1548 case EBML_NEST:
1549 if (syntax[i].list_elem_size) {
1550 EbmlList *list = data_off;
1551 char *ptr = list->elem;
1552 for (j = 0; j < list->nb_elem;
1553 j++, ptr += syntax[i].list_elem_size)
1554 ebml_free(syntax[i].def.n, ptr);
1555 av_freep(&list->elem);
1556 list->nb_elem = 0;
1557 list->alloc_elem_size = 0;
1558 } else
1559 ebml_free(syntax[i].def.n, data_off);
1560 default:
1561 break;
1562 }
1563 }
1564 }
1565
1566 /*
1567 * Autodetecting...
1568 */
matroska_probe(const AVProbeData * p)1569 static int matroska_probe(const AVProbeData *p)
1570 {
1571 uint64_t total = 0;
1572 int len_mask = 0x80, size = 1, n = 1, i;
1573
1574 /* EBML header? */
1575 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1576 return 0;
1577
1578 /* length of header */
1579 total = p->buf[4];
1580 while (size <= 8 && !(total & len_mask)) {
1581 size++;
1582 len_mask >>= 1;
1583 }
1584 if (size > 8)
1585 return 0;
1586 total &= (len_mask - 1);
1587 while (n < size)
1588 total = (total << 8) | p->buf[4 + n++];
1589
1590 if (total + 1 == 1ULL << (7 * size)){
1591 /* Unknown-length header - simply parse the whole buffer. */
1592 total = p->buf_size - 4 - size;
1593 } else {
1594 /* Does the probe data contain the whole header? */
1595 if (p->buf_size < 4 + size + total)
1596 return 0;
1597 }
1598
1599 /* The header should contain a known document type. For now,
1600 * we don't parse the whole header but simply check for the
1601 * availability of that array of characters inside the header.
1602 * Not fully fool-proof, but good enough. */
1603 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1604 size_t probelen = strlen(matroska_doctypes[i]);
1605 if (total < probelen)
1606 continue;
1607 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1608 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1609 return AVPROBE_SCORE_MAX;
1610 }
1611
1612 // probably valid EBML header but no recognized doctype
1613 return AVPROBE_SCORE_EXTENSION;
1614 }
1615
matroska_find_track_by_num(MatroskaDemuxContext * matroska,uint64_t num)1616 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1617 uint64_t num)
1618 {
1619 MatroskaTrack *tracks = matroska->tracks.elem;
1620 int i;
1621
1622 for (i = 0; i < matroska->tracks.nb_elem; i++)
1623 if (tracks[i].num == num)
1624 return &tracks[i];
1625
1626 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %"PRIu64"\n", num);
1627 return NULL;
1628 }
1629
matroska_decode_buffer(uint8_t ** buf,int * buf_size,MatroskaTrack * track)1630 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1631 MatroskaTrack *track)
1632 {
1633 MatroskaTrackEncoding *encodings = track->encodings.elem;
1634 uint8_t *data = *buf;
1635 int isize = *buf_size;
1636 uint8_t *pkt_data = NULL;
1637 uint8_t av_unused *newpktdata;
1638 int pkt_size = isize;
1639 int result = 0;
1640 int olen;
1641
1642 if (pkt_size >= 10000000U)
1643 return AVERROR_INVALIDDATA;
1644
1645 switch (encodings[0].compression.algo) {
1646 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1647 {
1648 int header_size = encodings[0].compression.settings.size;
1649 uint8_t *header = encodings[0].compression.settings.data;
1650
1651 if (header_size && !header) {
1652 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1653 return -1;
1654 }
1655
1656 if (!header_size)
1657 return 0;
1658
1659 pkt_size = isize + header_size;
1660 pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1661 if (!pkt_data)
1662 return AVERROR(ENOMEM);
1663
1664 memcpy(pkt_data, header, header_size);
1665 memcpy(pkt_data + header_size, data, isize);
1666 break;
1667 }
1668 #if CONFIG_LZO
1669 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1670 do {
1671 int insize = isize;
1672 olen = pkt_size *= 3;
1673 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1674 + AV_INPUT_BUFFER_PADDING_SIZE);
1675 if (!newpktdata) {
1676 result = AVERROR(ENOMEM);
1677 goto failed;
1678 }
1679 pkt_data = newpktdata;
1680 result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1681 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1682 if (result) {
1683 result = AVERROR_INVALIDDATA;
1684 goto failed;
1685 }
1686 pkt_size -= olen;
1687 break;
1688 #endif
1689 #if CONFIG_ZLIB
1690 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1691 {
1692 z_stream zstream = { 0 };
1693 if (inflateInit(&zstream) != Z_OK)
1694 return -1;
1695 zstream.next_in = data;
1696 zstream.avail_in = isize;
1697 do {
1698 pkt_size *= 3;
1699 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1700 if (!newpktdata) {
1701 inflateEnd(&zstream);
1702 result = AVERROR(ENOMEM);
1703 goto failed;
1704 }
1705 pkt_data = newpktdata;
1706 zstream.avail_out = pkt_size - zstream.total_out;
1707 zstream.next_out = pkt_data + zstream.total_out;
1708 result = inflate(&zstream, Z_NO_FLUSH);
1709 } while (result == Z_OK && pkt_size < 10000000);
1710 pkt_size = zstream.total_out;
1711 inflateEnd(&zstream);
1712 if (result != Z_STREAM_END) {
1713 if (result == Z_MEM_ERROR)
1714 result = AVERROR(ENOMEM);
1715 else
1716 result = AVERROR_INVALIDDATA;
1717 goto failed;
1718 }
1719 break;
1720 }
1721 #endif
1722 #if CONFIG_BZLIB
1723 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1724 {
1725 bz_stream bzstream = { 0 };
1726 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1727 return -1;
1728 bzstream.next_in = data;
1729 bzstream.avail_in = isize;
1730 do {
1731 pkt_size *= 3;
1732 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1733 if (!newpktdata) {
1734 BZ2_bzDecompressEnd(&bzstream);
1735 result = AVERROR(ENOMEM);
1736 goto failed;
1737 }
1738 pkt_data = newpktdata;
1739 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1740 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1741 result = BZ2_bzDecompress(&bzstream);
1742 } while (result == BZ_OK && pkt_size < 10000000);
1743 pkt_size = bzstream.total_out_lo32;
1744 BZ2_bzDecompressEnd(&bzstream);
1745 if (result != BZ_STREAM_END) {
1746 if (result == BZ_MEM_ERROR)
1747 result = AVERROR(ENOMEM);
1748 else
1749 result = AVERROR_INVALIDDATA;
1750 goto failed;
1751 }
1752 break;
1753 }
1754 #endif
1755 default:
1756 return AVERROR_INVALIDDATA;
1757 }
1758
1759 memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1760
1761 *buf = pkt_data;
1762 *buf_size = pkt_size;
1763 return 0;
1764
1765 failed:
1766 av_free(pkt_data);
1767 return result;
1768 }
1769
matroska_convert_tag(AVFormatContext * s,EbmlList * list,AVDictionary ** metadata,char * prefix)1770 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1771 AVDictionary **metadata, char *prefix)
1772 {
1773 MatroskaTag *tags = list->elem;
1774 char key[1024];
1775 int i;
1776
1777 for (i = 0; i < list->nb_elem; i++) {
1778 const char *lang = tags[i].lang &&
1779 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1780
1781 if (!tags[i].name) {
1782 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1783 continue;
1784 }
1785 if (prefix)
1786 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1787 else
1788 av_strlcpy(key, tags[i].name, sizeof(key));
1789 if (tags[i].def || !lang) {
1790 av_dict_set(metadata, key, tags[i].string, 0);
1791 if (tags[i].sub.nb_elem)
1792 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1793 }
1794 if (lang) {
1795 av_strlcat(key, "-", sizeof(key));
1796 av_strlcat(key, lang, sizeof(key));
1797 av_dict_set(metadata, key, tags[i].string, 0);
1798 if (tags[i].sub.nb_elem)
1799 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1800 }
1801 }
1802 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1803 }
1804
matroska_convert_tags(AVFormatContext * s)1805 static void matroska_convert_tags(AVFormatContext *s)
1806 {
1807 MatroskaDemuxContext *matroska = s->priv_data;
1808 MatroskaTags *tags = matroska->tags.elem;
1809 int i, j;
1810
1811 for (i = 0; i < matroska->tags.nb_elem; i++) {
1812 if (tags[i].target.attachuid) {
1813 MatroskaAttachment *attachment = matroska->attachments.elem;
1814 int found = 0;
1815 for (j = 0; j < matroska->attachments.nb_elem; j++) {
1816 if (attachment[j].uid == tags[i].target.attachuid &&
1817 attachment[j].stream) {
1818 matroska_convert_tag(s, &tags[i].tag,
1819 &attachment[j].stream->metadata, NULL);
1820 found = 1;
1821 }
1822 }
1823 if (!found) {
1824 av_log(s, AV_LOG_WARNING,
1825 "The tags at index %d refer to a "
1826 "non-existent attachment %"PRId64".\n",
1827 i, tags[i].target.attachuid);
1828 }
1829 } else if (tags[i].target.chapteruid) {
1830 MatroskaChapter *chapter = matroska->chapters.elem;
1831 int found = 0;
1832 for (j = 0; j < matroska->chapters.nb_elem; j++) {
1833 if (chapter[j].uid == tags[i].target.chapteruid &&
1834 chapter[j].chapter) {
1835 matroska_convert_tag(s, &tags[i].tag,
1836 &chapter[j].chapter->metadata, NULL);
1837 found = 1;
1838 }
1839 }
1840 if (!found) {
1841 av_log(s, AV_LOG_WARNING,
1842 "The tags at index %d refer to a non-existent chapter "
1843 "%"PRId64".\n",
1844 i, tags[i].target.chapteruid);
1845 }
1846 } else if (tags[i].target.trackuid) {
1847 MatroskaTrack *track = matroska->tracks.elem;
1848 int found = 0;
1849 for (j = 0; j < matroska->tracks.nb_elem; j++) {
1850 if (track[j].uid == tags[i].target.trackuid &&
1851 track[j].stream) {
1852 matroska_convert_tag(s, &tags[i].tag,
1853 &track[j].stream->metadata, NULL);
1854 found = 1;
1855 }
1856 }
1857 if (!found) {
1858 av_log(s, AV_LOG_WARNING,
1859 "The tags at index %d refer to a non-existent track "
1860 "%"PRId64".\n",
1861 i, tags[i].target.trackuid);
1862 }
1863 } else {
1864 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1865 tags[i].target.type);
1866 }
1867 }
1868 }
1869
matroska_parse_seekhead_entry(MatroskaDemuxContext * matroska,int64_t pos)1870 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1871 int64_t pos)
1872 {
1873 uint32_t saved_id = matroska->current_id;
1874 int64_t before_pos = avio_tell(matroska->ctx->pb);
1875 int ret = 0;
1876 int ret2;
1877
1878 /* seek */
1879 if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1880 /* We don't want to lose our seekhead level, so we add
1881 * a dummy. This is a crude hack. */
1882 if (matroska->num_levels == EBML_MAX_DEPTH) {
1883 av_log(matroska->ctx, AV_LOG_INFO,
1884 "Max EBML element depth (%d) reached, "
1885 "cannot parse further.\n", EBML_MAX_DEPTH);
1886 ret = AVERROR_INVALIDDATA;
1887 } else {
1888 matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1889 matroska->num_levels++;
1890 matroska->current_id = 0;
1891
1892 ret = ebml_parse(matroska, matroska_segment, matroska);
1893 if (ret == LEVEL_ENDED) {
1894 /* This can only happen if the seek brought us beyond EOF. */
1895 ret = AVERROR_EOF;
1896 }
1897 }
1898 }
1899 /* Seek back - notice that in all instances where this is used
1900 * it is safe to set the level to 1. */
1901 ret2 = matroska_reset_status(matroska, saved_id, before_pos);
1902 if (ret >= 0)
1903 ret = ret2;
1904
1905 return ret;
1906 }
1907
matroska_execute_seekhead(MatroskaDemuxContext * matroska)1908 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1909 {
1910 EbmlList *seekhead_list = &matroska->seekhead;
1911 int i;
1912
1913 // we should not do any seeking in the streaming case
1914 if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1915 return;
1916
1917 for (i = 0; i < seekhead_list->nb_elem; i++) {
1918 MatroskaSeekhead *seekheads = seekhead_list->elem;
1919 uint32_t id = seekheads[i].id;
1920 int64_t pos = seekheads[i].pos + matroska->segment_start;
1921 MatroskaLevel1Element *elem;
1922
1923 if (id != seekheads[i].id || pos < matroska->segment_start)
1924 continue;
1925
1926 elem = matroska_find_level1_elem(matroska, id, pos);
1927 if (!elem || elem->parsed)
1928 continue;
1929
1930 elem->pos = pos;
1931
1932 // defer cues parsing until we actually need cue data.
1933 if (id == MATROSKA_ID_CUES)
1934 continue;
1935
1936 if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1937 // mark index as broken
1938 matroska->cues_parsing_deferred = -1;
1939 break;
1940 }
1941
1942 elem->parsed = 1;
1943 }
1944 }
1945
matroska_add_index_entries(MatroskaDemuxContext * matroska)1946 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1947 {
1948 EbmlList *index_list;
1949 MatroskaIndex *index;
1950 uint64_t index_scale = 1;
1951 int i, j;
1952
1953 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1954 return;
1955
1956 index_list = &matroska->index;
1957 index = index_list->elem;
1958 if (index_list->nb_elem < 2)
1959 return;
1960 if (index[1].time > 1E14 / matroska->time_scale) {
1961 av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1962 return;
1963 }
1964 for (i = 0; i < index_list->nb_elem; i++) {
1965 EbmlList *pos_list = &index[i].pos;
1966 MatroskaIndexPos *pos = pos_list->elem;
1967 for (j = 0; j < pos_list->nb_elem; j++) {
1968 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1969 pos[j].track);
1970 if (track && track->stream)
1971 av_add_index_entry(track->stream,
1972 pos[j].pos + matroska->segment_start,
1973 index[i].time / index_scale, 0, 0,
1974 AVINDEX_KEYFRAME);
1975 }
1976 }
1977 }
1978
matroska_parse_cues(MatroskaDemuxContext * matroska)1979 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1980 int i;
1981
1982 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1983 return;
1984
1985 for (i = 0; i < matroska->num_level1_elems; i++) {
1986 MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1987 if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1988 if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1989 matroska->cues_parsing_deferred = -1;
1990 elem->parsed = 1;
1991 break;
1992 }
1993 }
1994
1995 matroska_add_index_entries(matroska);
1996 }
1997
matroska_aac_profile(char * codec_id)1998 static int matroska_aac_profile(char *codec_id)
1999 {
2000 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
2001 int profile;
2002
2003 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
2004 if (strstr(codec_id, aac_profiles[profile]))
2005 break;
2006 return profile + 1;
2007 }
2008
matroska_aac_sri(int samplerate)2009 static int matroska_aac_sri(int samplerate)
2010 {
2011 int sri;
2012
2013 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
2014 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
2015 break;
2016 return sri;
2017 }
2018
matroska_metadata_creation_time(AVDictionary ** metadata,int64_t date_utc)2019 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
2020 {
2021 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
2022 avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
2023 }
2024
matroska_parse_flac(AVFormatContext * s,MatroskaTrack * track,int * offset)2025 static int matroska_parse_flac(AVFormatContext *s,
2026 MatroskaTrack *track,
2027 int *offset)
2028 {
2029 AVStream *st = track->stream;
2030 uint8_t *p = track->codec_priv.data;
2031 int size = track->codec_priv.size;
2032
2033 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
2034 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
2035 track->codec_priv.size = 0;
2036 return 0;
2037 }
2038 *offset = 8;
2039 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
2040
2041 p += track->codec_priv.size;
2042 size -= track->codec_priv.size;
2043
2044 /* parse the remaining metadata blocks if present */
2045 while (size >= 4) {
2046 int block_last, block_type, block_size;
2047
2048 flac_parse_block_header(p, &block_last, &block_type, &block_size);
2049
2050 p += 4;
2051 size -= 4;
2052 if (block_size > size)
2053 return 0;
2054
2055 /* check for the channel mask */
2056 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
2057 AVDictionary *dict = NULL;
2058 AVDictionaryEntry *chmask;
2059
2060 ff_vorbis_comment(s, &dict, p, block_size, 0);
2061 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
2062 if (chmask) {
2063 uint64_t mask = strtol(chmask->value, NULL, 0);
2064 if (!mask || mask & ~0x3ffffULL) {
2065 av_log(s, AV_LOG_WARNING,
2066 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
2067 } else
2068 st->codecpar->channel_layout = mask;
2069 }
2070 av_dict_free(&dict);
2071 }
2072
2073 p += block_size;
2074 size -= block_size;
2075 }
2076
2077 return 0;
2078 }
2079
mkv_field_order(MatroskaDemuxContext * matroska,int64_t field_order)2080 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2081 {
2082 int minor, micro, bttb = 0;
2083
2084 /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2085 * this function, and fixed in 57.52 */
2086 if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf57.%d.%d", &minor, µ) == 2)
2087 bttb = (minor >= 36 && minor <= 51 && micro >= 100);
2088
2089 switch (field_order) {
2090 case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
2091 return AV_FIELD_PROGRESSIVE;
2092 case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
2093 return AV_FIELD_UNKNOWN;
2094 case MATROSKA_VIDEO_FIELDORDER_TT:
2095 return AV_FIELD_TT;
2096 case MATROSKA_VIDEO_FIELDORDER_BB:
2097 return AV_FIELD_BB;
2098 case MATROSKA_VIDEO_FIELDORDER_BT:
2099 return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2100 case MATROSKA_VIDEO_FIELDORDER_TB:
2101 return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2102 default:
2103 return AV_FIELD_UNKNOWN;
2104 }
2105 }
2106
mkv_stereo_mode_display_mul(int stereo_mode,int * h_width,int * h_height)2107 static void mkv_stereo_mode_display_mul(int stereo_mode,
2108 int *h_width, int *h_height)
2109 {
2110 switch (stereo_mode) {
2111 case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
2112 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
2113 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
2114 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
2115 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
2116 break;
2117 case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
2118 case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
2119 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
2120 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
2121 *h_width = 2;
2122 break;
2123 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
2124 case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
2125 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
2126 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
2127 *h_height = 2;
2128 break;
2129 }
2130 }
2131
mkv_parse_video_color(AVStream * st,const MatroskaTrack * track)2132 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2133 const MatroskaTrackVideoColor *color = track->video.color.elem;
2134 const MatroskaMasteringMeta *mastering_meta;
2135 int has_mastering_primaries, has_mastering_luminance;
2136
2137 if (!track->video.color.nb_elem)
2138 return 0;
2139
2140 mastering_meta = &color->mastering_meta;
2141 // Mastering primaries are CIE 1931 coords, and must be > 0.
2142 has_mastering_primaries =
2143 mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2144 mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2145 mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2146 mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2147 has_mastering_luminance = mastering_meta->max_luminance >
2148 mastering_meta->min_luminance.el.f &&
2149 mastering_meta->min_luminance.el.f >= 0 &&
2150 mastering_meta->min_luminance.count;
2151
2152 if (color->matrix_coefficients != AVCOL_SPC_RESERVED)
2153 st->codecpar->color_space = color->matrix_coefficients;
2154 if (color->primaries != AVCOL_PRI_RESERVED &&
2155 color->primaries != AVCOL_PRI_RESERVED0)
2156 st->codecpar->color_primaries = color->primaries;
2157 if (color->transfer_characteristics != AVCOL_TRC_RESERVED &&
2158 color->transfer_characteristics != AVCOL_TRC_RESERVED0)
2159 st->codecpar->color_trc = color->transfer_characteristics;
2160 if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2161 color->range <= AVCOL_RANGE_JPEG)
2162 st->codecpar->color_range = color->range;
2163 if (color->chroma_siting_horz != MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED &&
2164 color->chroma_siting_vert != MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED &&
2165 color->chroma_siting_horz < MATROSKA_COLOUR_CHROMASITINGHORZ_NB &&
2166 color->chroma_siting_vert < MATROSKA_COLOUR_CHROMASITINGVERT_NB) {
2167 st->codecpar->chroma_location =
2168 avcodec_chroma_pos_to_enum((color->chroma_siting_horz - 1) << 7,
2169 (color->chroma_siting_vert - 1) << 7);
2170 }
2171 if (color->max_cll && color->max_fall) {
2172 size_t size = 0;
2173 int ret;
2174 AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
2175 if (!metadata)
2176 return AVERROR(ENOMEM);
2177 ret = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
2178 (uint8_t *)metadata, size);
2179 if (ret < 0) {
2180 av_freep(&metadata);
2181 return ret;
2182 }
2183 metadata->MaxCLL = color->max_cll;
2184 metadata->MaxFALL = color->max_fall;
2185 }
2186
2187 if (has_mastering_primaries || has_mastering_luminance) {
2188 AVMasteringDisplayMetadata *metadata =
2189 (AVMasteringDisplayMetadata*) av_stream_new_side_data(
2190 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
2191 sizeof(AVMasteringDisplayMetadata));
2192 if (!metadata) {
2193 return AVERROR(ENOMEM);
2194 }
2195 memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2196 if (has_mastering_primaries) {
2197 metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2198 metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2199 metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2200 metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2201 metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2202 metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2203 metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2204 metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2205 metadata->has_primaries = 1;
2206 }
2207 if (has_mastering_luminance) {
2208 metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2209 metadata->min_luminance = av_d2q(mastering_meta->min_luminance.el.f, INT_MAX);
2210 metadata->has_luminance = 1;
2211 }
2212 }
2213 return 0;
2214 }
2215
mkv_parse_video_projection(AVStream * st,const MatroskaTrack * track,void * logctx)2216 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
2217 void *logctx)
2218 {
2219 AVSphericalMapping *spherical;
2220 const MatroskaTrackVideoProjection *mkv_projection = &track->video.projection;
2221 const uint8_t *priv_data = mkv_projection->private.data;
2222 enum AVSphericalProjection projection;
2223 size_t spherical_size;
2224 uint32_t l = 0, t = 0, r = 0, b = 0;
2225 uint32_t padding = 0;
2226 int ret;
2227
2228 if (mkv_projection->private.size && priv_data[0] != 0) {
2229 av_log(logctx, AV_LOG_WARNING, "Unknown spherical metadata\n");
2230 return 0;
2231 }
2232
2233 switch (track->video.projection.type) {
2234 case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
2235 if (track->video.projection.private.size == 20) {
2236 t = AV_RB32(priv_data + 4);
2237 b = AV_RB32(priv_data + 8);
2238 l = AV_RB32(priv_data + 12);
2239 r = AV_RB32(priv_data + 16);
2240
2241 if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2242 av_log(logctx, AV_LOG_ERROR,
2243 "Invalid bounding rectangle coordinates "
2244 "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2245 l, t, r, b);
2246 return AVERROR_INVALIDDATA;
2247 }
2248 } else if (track->video.projection.private.size != 0) {
2249 av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2250 return AVERROR_INVALIDDATA;
2251 }
2252
2253 if (l || t || r || b)
2254 projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2255 else
2256 projection = AV_SPHERICAL_EQUIRECTANGULAR;
2257 break;
2258 case MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP:
2259 if (track->video.projection.private.size < 4) {
2260 av_log(logctx, AV_LOG_ERROR, "Missing projection private properties\n");
2261 return AVERROR_INVALIDDATA;
2262 } else if (track->video.projection.private.size == 12) {
2263 uint32_t layout = AV_RB32(priv_data + 4);
2264 if (layout) {
2265 av_log(logctx, AV_LOG_WARNING,
2266 "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2267 return 0;
2268 }
2269 projection = AV_SPHERICAL_CUBEMAP;
2270 padding = AV_RB32(priv_data + 8);
2271 } else {
2272 av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2273 return AVERROR_INVALIDDATA;
2274 }
2275 break;
2276 case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
2277 /* No Spherical metadata */
2278 return 0;
2279 default:
2280 av_log(logctx, AV_LOG_WARNING,
2281 "Unknown spherical metadata type %"PRIu64"\n",
2282 track->video.projection.type);
2283 return 0;
2284 }
2285
2286 spherical = av_spherical_alloc(&spherical_size);
2287 if (!spherical)
2288 return AVERROR(ENOMEM);
2289
2290 spherical->projection = projection;
2291
2292 spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2293 spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2294 spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2295
2296 spherical->padding = padding;
2297
2298 spherical->bound_left = l;
2299 spherical->bound_top = t;
2300 spherical->bound_right = r;
2301 spherical->bound_bottom = b;
2302
2303 ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2304 spherical_size);
2305 if (ret < 0) {
2306 av_freep(&spherical);
2307 return ret;
2308 }
2309
2310 return 0;
2311 }
2312
get_qt_codec(MatroskaTrack * track,uint32_t * fourcc,enum AVCodecID * codec_id)2313 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2314 {
2315 const AVCodecTag *codec_tags;
2316
2317 codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2318 ff_codec_movvideo_tags : ff_codec_movaudio_tags;
2319
2320 /* Normalize noncompliant private data that starts with the fourcc
2321 * by expanding/shifting the data by 4 bytes and storing the data
2322 * size at the start. */
2323 if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2324 int ret = av_buffer_realloc(&track->codec_priv.buf,
2325 track->codec_priv.size + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
2326 if (ret < 0)
2327 return ret;
2328
2329 track->codec_priv.data = track->codec_priv.buf->data;
2330 memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2331 track->codec_priv.size += 4;
2332 AV_WB32(track->codec_priv.data, track->codec_priv.size);
2333 }
2334
2335 *fourcc = AV_RL32(track->codec_priv.data + 4);
2336 *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2337
2338 return 0;
2339 }
2340
matroska_parse_tracks(AVFormatContext * s)2341 static int matroska_parse_tracks(AVFormatContext *s)
2342 {
2343 MatroskaDemuxContext *matroska = s->priv_data;
2344 MatroskaTrack *tracks = matroska->tracks.elem;
2345 AVStream *st;
2346 int i, j, ret;
2347 int k;
2348
2349 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2350 MatroskaTrack *track = &tracks[i];
2351 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
2352 EbmlList *encodings_list = &track->encodings;
2353 MatroskaTrackEncoding *encodings = encodings_list->elem;
2354 uint8_t *extradata = NULL;
2355 int extradata_size = 0;
2356 int extradata_offset = 0;
2357 uint32_t fourcc = 0;
2358 AVIOContext b;
2359 char* key_id_base64 = NULL;
2360 int bit_depth = -1;
2361
2362 /* Apply some sanity checks. */
2363 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2364 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2365 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2366 track->type != MATROSKA_TRACK_TYPE_METADATA) {
2367 av_log(matroska->ctx, AV_LOG_INFO,
2368 "Unknown or unsupported track type %"PRIu64"\n",
2369 track->type);
2370 continue;
2371 }
2372 if (!track->codec_id)
2373 continue;
2374
2375 if ( track->type == MATROSKA_TRACK_TYPE_AUDIO && track->codec_id[0] != 'A'
2376 || track->type == MATROSKA_TRACK_TYPE_VIDEO && track->codec_id[0] != 'V'
2377 || track->type == MATROSKA_TRACK_TYPE_SUBTITLE && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2378 || track->type == MATROSKA_TRACK_TYPE_METADATA && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2379 ) {
2380 av_log(matroska->ctx, AV_LOG_INFO, "Inconsistent track type\n");
2381 continue;
2382 }
2383
2384 if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2385 isnan(track->audio.samplerate)) {
2386 av_log(matroska->ctx, AV_LOG_WARNING,
2387 "Invalid sample rate %f, defaulting to 8000 instead.\n",
2388 track->audio.samplerate);
2389 track->audio.samplerate = 8000;
2390 }
2391
2392 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2393 if (!track->default_duration && track->video.frame_rate > 0) {
2394 double default_duration = 1000000000 / track->video.frame_rate;
2395 if (default_duration > UINT64_MAX || default_duration < 0) {
2396 av_log(matroska->ctx, AV_LOG_WARNING,
2397 "Invalid frame rate %e. Cannot calculate default duration.\n",
2398 track->video.frame_rate);
2399 } else {
2400 track->default_duration = default_duration;
2401 }
2402 }
2403 if (track->video.display_width == -1)
2404 track->video.display_width = track->video.pixel_width;
2405 if (track->video.display_height == -1)
2406 track->video.display_height = track->video.pixel_height;
2407 if (track->video.color_space.size == 4)
2408 fourcc = AV_RL32(track->video.color_space.data);
2409 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2410 if (!track->audio.out_samplerate)
2411 track->audio.out_samplerate = track->audio.samplerate;
2412 }
2413 if (encodings_list->nb_elem > 1) {
2414 av_log(matroska->ctx, AV_LOG_ERROR,
2415 "Multiple combined encodings not supported");
2416 } else if (encodings_list->nb_elem == 1) {
2417 if (encodings[0].type) {
2418 if (encodings[0].encryption.key_id.size > 0) {
2419 /* Save the encryption key id to be stored later as a
2420 metadata tag. */
2421 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2422 key_id_base64 = av_malloc(b64_size);
2423 if (key_id_base64 == NULL)
2424 return AVERROR(ENOMEM);
2425
2426 av_base64_encode(key_id_base64, b64_size,
2427 encodings[0].encryption.key_id.data,
2428 encodings[0].encryption.key_id.size);
2429 } else {
2430 encodings[0].scope = 0;
2431 av_log(matroska->ctx, AV_LOG_ERROR,
2432 "Unsupported encoding type");
2433 }
2434 } else if (
2435 #if CONFIG_ZLIB
2436 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2437 #endif
2438 #if CONFIG_BZLIB
2439 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
2440 #endif
2441 #if CONFIG_LZO
2442 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
2443 #endif
2444 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
2445 encodings[0].scope = 0;
2446 av_log(matroska->ctx, AV_LOG_ERROR,
2447 "Unsupported encoding type");
2448 } else if (track->codec_priv.size && encodings[0].scope & 2) {
2449 uint8_t *codec_priv = track->codec_priv.data;
2450 int ret = matroska_decode_buffer(&track->codec_priv.data,
2451 &track->codec_priv.size,
2452 track);
2453 if (ret < 0) {
2454 track->codec_priv.data = NULL;
2455 track->codec_priv.size = 0;
2456 av_log(matroska->ctx, AV_LOG_ERROR,
2457 "Failed to decode codec private data\n");
2458 }
2459
2460 if (codec_priv != track->codec_priv.data) {
2461 av_buffer_unref(&track->codec_priv.buf);
2462 if (track->codec_priv.data) {
2463 track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2464 track->codec_priv.size + AV_INPUT_BUFFER_PADDING_SIZE,
2465 NULL, NULL, 0);
2466 if (!track->codec_priv.buf) {
2467 av_freep(&track->codec_priv.data);
2468 track->codec_priv.size = 0;
2469 return AVERROR(ENOMEM);
2470 }
2471 }
2472 }
2473 }
2474 }
2475 track->needs_decoding = encodings && !encodings[0].type &&
2476 encodings[0].scope & 1 &&
2477 (encodings[0].compression.algo !=
2478 MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP ||
2479 encodings[0].compression.settings.size);
2480
2481 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2482 if (av_strstart(track->codec_id, ff_mkv_codec_tags[j].str, NULL)) {
2483 codec_id = ff_mkv_codec_tags[j].id;
2484 break;
2485 }
2486 }
2487
2488 st = track->stream = avformat_new_stream(s, NULL);
2489 if (!st) {
2490 av_free(key_id_base64);
2491 return AVERROR(ENOMEM);
2492 }
2493
2494 if (key_id_base64) {
2495 /* export encryption key id as base64 metadata tag */
2496 av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2497 AV_DICT_DONT_STRDUP_VAL);
2498 }
2499
2500 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2501 track->codec_priv.size >= 40 &&
2502 track->codec_priv.data) {
2503 track->ms_compat = 1;
2504 bit_depth = AV_RL16(track->codec_priv.data + 14);
2505 fourcc = AV_RL32(track->codec_priv.data + 16);
2506 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
2507 fourcc);
2508 if (!codec_id)
2509 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
2510 fourcc);
2511 extradata_offset = 40;
2512 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2513 track->codec_priv.size >= 14 &&
2514 track->codec_priv.data) {
2515 int ret;
2516 ffio_init_context(&b, track->codec_priv.data,
2517 track->codec_priv.size,
2518 0, NULL, NULL, NULL, NULL);
2519 ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2520 if (ret < 0)
2521 return ret;
2522 codec_id = st->codecpar->codec_id;
2523 fourcc = st->codecpar->codec_tag;
2524 extradata_offset = FFMIN(track->codec_priv.size, 18);
2525 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2526 /* Normally 36, but allow noncompliant private data */
2527 && (track->codec_priv.size >= 32)
2528 && (track->codec_priv.data)) {
2529 uint16_t sample_size;
2530 int ret = get_qt_codec(track, &fourcc, &codec_id);
2531 if (ret < 0)
2532 return ret;
2533 sample_size = AV_RB16(track->codec_priv.data + 26);
2534 if (fourcc == 0) {
2535 if (sample_size == 8) {
2536 fourcc = MKTAG('r','a','w',' ');
2537 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2538 } else if (sample_size == 16) {
2539 fourcc = MKTAG('t','w','o','s');
2540 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2541 }
2542 }
2543 if ((fourcc == MKTAG('t','w','o','s') ||
2544 fourcc == MKTAG('s','o','w','t')) &&
2545 sample_size == 8)
2546 codec_id = AV_CODEC_ID_PCM_S8;
2547 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2548 (track->codec_priv.size >= 21) &&
2549 (track->codec_priv.data)) {
2550 int ret = get_qt_codec(track, &fourcc, &codec_id);
2551 if (ret < 0)
2552 return ret;
2553 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2554 fourcc = MKTAG('S','V','Q','3');
2555 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2556 }
2557 if (codec_id == AV_CODEC_ID_NONE)
2558 av_log(matroska->ctx, AV_LOG_ERROR,
2559 "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2560 if (track->codec_priv.size >= 86) {
2561 bit_depth = AV_RB16(track->codec_priv.data + 82);
2562 ffio_init_context(&b, track->codec_priv.data,
2563 track->codec_priv.size,
2564 0, NULL, NULL, NULL, NULL);
2565 if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2566 bit_depth &= 0x1F;
2567 track->has_palette = 1;
2568 }
2569 }
2570 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2571 switch (track->audio.bitdepth) {
2572 case 8:
2573 codec_id = AV_CODEC_ID_PCM_U8;
2574 break;
2575 case 24:
2576 codec_id = AV_CODEC_ID_PCM_S24BE;
2577 break;
2578 case 32:
2579 codec_id = AV_CODEC_ID_PCM_S32BE;
2580 break;
2581 }
2582 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2583 switch (track->audio.bitdepth) {
2584 case 8:
2585 codec_id = AV_CODEC_ID_PCM_U8;
2586 break;
2587 case 24:
2588 codec_id = AV_CODEC_ID_PCM_S24LE;
2589 break;
2590 case 32:
2591 codec_id = AV_CODEC_ID_PCM_S32LE;
2592 break;
2593 }
2594 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2595 track->audio.bitdepth == 64) {
2596 codec_id = AV_CODEC_ID_PCM_F64LE;
2597 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2598 int profile = matroska_aac_profile(track->codec_id);
2599 int sri = matroska_aac_sri(track->audio.samplerate);
2600 extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2601 if (!extradata)
2602 return AVERROR(ENOMEM);
2603 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2604 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2605 if (strstr(track->codec_id, "SBR")) {
2606 sri = matroska_aac_sri(track->audio.out_samplerate);
2607 extradata[2] = 0x56;
2608 extradata[3] = 0xE5;
2609 extradata[4] = 0x80 | (sri << 3);
2610 extradata_size = 5;
2611 } else
2612 extradata_size = 2;
2613 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2614 /* Only ALAC's magic cookie is stored in Matroska's track headers.
2615 * Create the "atom size", "tag", and "tag version" fields the
2616 * decoder expects manually. */
2617 extradata_size = 12 + track->codec_priv.size;
2618 extradata = av_mallocz(extradata_size +
2619 AV_INPUT_BUFFER_PADDING_SIZE);
2620 if (!extradata)
2621 return AVERROR(ENOMEM);
2622 AV_WB32(extradata, extradata_size);
2623 memcpy(&extradata[4], "alac", 4);
2624 AV_WB32(&extradata[8], 0);
2625 memcpy(&extradata[12], track->codec_priv.data,
2626 track->codec_priv.size);
2627 } else if (codec_id == AV_CODEC_ID_TTA) {
2628 uint8_t *ptr;
2629 if (track->audio.channels > UINT16_MAX ||
2630 track->audio.bitdepth > UINT16_MAX) {
2631 av_log(matroska->ctx, AV_LOG_WARNING,
2632 "Too large audio channel number %"PRIu64
2633 " or bitdepth %"PRIu64". Skipping track.\n",
2634 track->audio.channels, track->audio.bitdepth);
2635 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2636 return AVERROR_INVALIDDATA;
2637 else
2638 continue;
2639 }
2640 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2641 return AVERROR_INVALIDDATA;
2642 extradata_size = 22;
2643 extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2644 if (!extradata)
2645 return AVERROR(ENOMEM);
2646 ptr = extradata;
2647 bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2648 bytestream_put_le16(&ptr, 1);
2649 bytestream_put_le16(&ptr, track->audio.channels);
2650 bytestream_put_le16(&ptr, track->audio.bitdepth);
2651 bytestream_put_le32(&ptr, track->audio.out_samplerate);
2652 bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2653 track->audio.out_samplerate,
2654 AV_TIME_BASE * 1000));
2655 } else if (codec_id == AV_CODEC_ID_RV10 ||
2656 codec_id == AV_CODEC_ID_RV20 ||
2657 codec_id == AV_CODEC_ID_RV30 ||
2658 codec_id == AV_CODEC_ID_RV40) {
2659 extradata_offset = 26;
2660 } else if (codec_id == AV_CODEC_ID_RA_144) {
2661 track->audio.out_samplerate = 8000;
2662 track->audio.channels = 1;
2663 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2664 codec_id == AV_CODEC_ID_COOK ||
2665 codec_id == AV_CODEC_ID_ATRAC3 ||
2666 codec_id == AV_CODEC_ID_SIPR)
2667 && track->codec_priv.data) {
2668 int flavor;
2669
2670 ffio_init_context(&b, track->codec_priv.data,
2671 track->codec_priv.size,
2672 0, NULL, NULL, NULL, NULL);
2673 avio_skip(&b, 22);
2674 flavor = avio_rb16(&b);
2675 track->audio.coded_framesize = avio_rb32(&b);
2676 avio_skip(&b, 12);
2677 track->audio.sub_packet_h = avio_rb16(&b);
2678 track->audio.frame_size = avio_rb16(&b);
2679 track->audio.sub_packet_size = avio_rb16(&b);
2680 if (track->audio.coded_framesize <= 0 ||
2681 track->audio.sub_packet_h <= 0 ||
2682 track->audio.frame_size <= 0)
2683 return AVERROR_INVALIDDATA;
2684
2685 if (codec_id == AV_CODEC_ID_RA_288) {
2686 if (track->audio.sub_packet_h & 1 || 2 * track->audio.frame_size
2687 != (int64_t)track->audio.sub_packet_h * track->audio.coded_framesize)
2688 return AVERROR_INVALIDDATA;
2689 st->codecpar->block_align = track->audio.coded_framesize;
2690 track->codec_priv.size = 0;
2691 } else {
2692 if (codec_id == AV_CODEC_ID_SIPR) {
2693 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2694 if (flavor > 3)
2695 return AVERROR_INVALIDDATA;
2696 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2697 st->codecpar->bit_rate = sipr_bit_rate[flavor];
2698 } else if (track->audio.sub_packet_size <= 0 ||
2699 track->audio.frame_size % track->audio.sub_packet_size)
2700 return AVERROR_INVALIDDATA;
2701 st->codecpar->block_align = track->audio.sub_packet_size;
2702 extradata_offset = 78;
2703 }
2704 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2705 track->audio.frame_size);
2706 if (!track->audio.buf)
2707 return AVERROR(ENOMEM);
2708 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2709 ret = matroska_parse_flac(s, track, &extradata_offset);
2710 if (ret < 0)
2711 return ret;
2712 } else if (codec_id == AV_CODEC_ID_WAVPACK && track->codec_priv.size < 2) {
2713 av_log(matroska->ctx, AV_LOG_INFO, "Assuming WavPack version 4.10 "
2714 "in absence of valid CodecPrivate.\n");
2715 extradata_size = 2;
2716 extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
2717 if (!extradata)
2718 return AVERROR(ENOMEM);
2719 AV_WL16(extradata, 0x410);
2720 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2721 fourcc = AV_RL32(track->codec_priv.data);
2722 } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2723 /* we don't need any value stored in CodecPrivate.
2724 make sure that it's not exported as extradata. */
2725 track->codec_priv.size = 0;
2726 } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2727 /* For now, propagate only the OBUs, if any. Once libavcodec is
2728 updated to handle isobmff style extradata this can be removed. */
2729 extradata_offset = 4;
2730 }
2731 track->codec_priv.size -= extradata_offset;
2732
2733 if (codec_id == AV_CODEC_ID_NONE)
2734 av_log(matroska->ctx, AV_LOG_INFO,
2735 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2736
2737 if (track->time_scale < 0.01) {
2738 av_log(matroska->ctx, AV_LOG_WARNING,
2739 "Track TimestampScale too small %f, assuming 1.0.\n",
2740 track->time_scale);
2741 track->time_scale = 1.0;
2742 }
2743 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2744 1000 * 1000 * 1000); /* 64 bit pts in ns */
2745
2746 /* convert the delay from ns to the track timebase */
2747 track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
2748 (AVRational){ 1, 1000000000 },
2749 st->time_base);
2750
2751 st->codecpar->codec_id = codec_id;
2752
2753 if (strcmp(track->language, "und"))
2754 av_dict_set(&st->metadata, "language", track->language, 0);
2755 av_dict_set(&st->metadata, "title", track->name, 0);
2756
2757 if (track->flag_default)
2758 st->disposition |= AV_DISPOSITION_DEFAULT;
2759 if (track->flag_forced)
2760 st->disposition |= AV_DISPOSITION_FORCED;
2761 if (track->flag_comment)
2762 st->disposition |= AV_DISPOSITION_COMMENT;
2763 if (track->flag_hearingimpaired)
2764 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
2765 if (track->flag_visualimpaired)
2766 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2767 if (track->flag_original.count > 0)
2768 st->disposition |= track->flag_original.el.u ? AV_DISPOSITION_ORIGINAL
2769 : AV_DISPOSITION_DUB;
2770
2771 if (!st->codecpar->extradata) {
2772 if (extradata) {
2773 st->codecpar->extradata = extradata;
2774 st->codecpar->extradata_size = extradata_size;
2775 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2776 if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2777 return AVERROR(ENOMEM);
2778 memcpy(st->codecpar->extradata,
2779 track->codec_priv.data + extradata_offset,
2780 track->codec_priv.size);
2781 }
2782 }
2783
2784 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2785 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
2786 int display_width_mul = 1;
2787 int display_height_mul = 1;
2788
2789 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2790 st->codecpar->codec_tag = fourcc;
2791 if (bit_depth >= 0)
2792 st->codecpar->bits_per_coded_sample = bit_depth;
2793 st->codecpar->width = track->video.pixel_width;
2794 st->codecpar->height = track->video.pixel_height;
2795
2796 if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
2797 st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2798 else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
2799 st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2800
2801 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2802 mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2803
2804 if (track->video.display_unit < MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN) {
2805 av_reduce(&st->sample_aspect_ratio.num,
2806 &st->sample_aspect_ratio.den,
2807 st->codecpar->height * track->video.display_width * display_width_mul,
2808 st->codecpar->width * track->video.display_height * display_height_mul,
2809 255);
2810 }
2811 if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2812 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2813
2814 if (track->default_duration) {
2815 int div = track->default_duration <= INT64_MAX ? 1 : 2;
2816 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2817 1000000000 / div, track->default_duration / div, 30000);
2818 #if FF_API_R_FRAME_RATE
2819 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2820 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2821 st->r_frame_rate = st->avg_frame_rate;
2822 #endif
2823 }
2824
2825 /* export stereo mode flag as metadata tag */
2826 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2827 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2828
2829 /* export alpha mode flag as metadata tag */
2830 if (track->video.alpha_mode)
2831 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2832
2833 /* if we have virtual track, mark the real tracks */
2834 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2835 char buf[32];
2836 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2837 continue;
2838 snprintf(buf, sizeof(buf), "%s_%d",
2839 ff_matroska_video_stereo_plane[planes[j].type], i);
2840 for (k=0; k < matroska->tracks.nb_elem; k++)
2841 if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2842 av_dict_set(&tracks[k].stream->metadata,
2843 "stereo_mode", buf, 0);
2844 break;
2845 }
2846 }
2847 // add stream level stereo3d side data if it is a supported format
2848 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
2849 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2850 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2851 if (ret < 0)
2852 return ret;
2853 }
2854
2855 ret = mkv_parse_video_color(st, track);
2856 if (ret < 0)
2857 return ret;
2858 ret = mkv_parse_video_projection(st, track, matroska->ctx);
2859 if (ret < 0)
2860 return ret;
2861 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2862 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
2863 st->codecpar->codec_tag = fourcc;
2864 st->codecpar->sample_rate = track->audio.out_samplerate;
2865 st->codecpar->channels = track->audio.channels;
2866 if (!st->codecpar->bits_per_coded_sample)
2867 st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
2868 if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2869 st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2870 st->codecpar->codec_id == AV_CODEC_ID_TRUEHD)
2871 st->need_parsing = AVSTREAM_PARSE_FULL;
2872 else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2873 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2874 if (track->codec_delay > 0) {
2875 st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
2876 (AVRational){1, 1000000000},
2877 (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2878 48000 : st->codecpar->sample_rate});
2879 }
2880 if (track->seek_preroll > 0) {
2881 st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
2882 (AVRational){1, 1000000000},
2883 (AVRational){1, st->codecpar->sample_rate});
2884 }
2885 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2886 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2887
2888 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2889 st->disposition |= AV_DISPOSITION_CAPTIONS;
2890 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2891 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2892 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2893 st->disposition |= AV_DISPOSITION_METADATA;
2894 }
2895 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2896 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2897
2898 if (track->flag_textdescriptions)
2899 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2900 }
2901 }
2902
2903 return 0;
2904 }
2905
matroska_read_header(AVFormatContext * s)2906 static int matroska_read_header(AVFormatContext *s)
2907 {
2908 MatroskaDemuxContext *matroska = s->priv_data;
2909 EbmlList *attachments_list = &matroska->attachments;
2910 EbmlList *chapters_list = &matroska->chapters;
2911 MatroskaAttachment *attachments;
2912 MatroskaChapter *chapters;
2913 uint64_t max_start = 0;
2914 int64_t pos;
2915 Ebml ebml = { 0 };
2916 int i, j, res;
2917
2918 matroska->ctx = s;
2919 matroska->cues_parsing_deferred = 1;
2920
2921 /* First read the EBML header. */
2922 if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2923 av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2924 ebml_free(ebml_syntax, &ebml);
2925 return AVERROR_INVALIDDATA;
2926 }
2927 if (ebml.version > EBML_VERSION ||
2928 ebml.max_size > sizeof(uint64_t) ||
2929 ebml.id_length > sizeof(uint32_t) ||
2930 ebml.doctype_version > 3) {
2931 avpriv_report_missing_feature(matroska->ctx,
2932 "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2933 ebml.version, ebml.doctype, ebml.doctype_version);
2934 ebml_free(ebml_syntax, &ebml);
2935 return AVERROR_PATCHWELCOME;
2936 } else if (ebml.doctype_version == 3) {
2937 av_log(matroska->ctx, AV_LOG_WARNING,
2938 "EBML header using unsupported features\n"
2939 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2940 ebml.version, ebml.doctype, ebml.doctype_version);
2941 }
2942 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2943 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2944 break;
2945 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2946 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2947 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2948 ebml_free(ebml_syntax, &ebml);
2949 return AVERROR_INVALIDDATA;
2950 }
2951 }
2952 ebml_free(ebml_syntax, &ebml);
2953
2954 matroska->pkt = av_packet_alloc();
2955 if (!matroska->pkt)
2956 return AVERROR(ENOMEM);
2957
2958 /* The next thing is a segment. */
2959 pos = avio_tell(matroska->ctx->pb);
2960 res = ebml_parse(matroska, matroska_segments, matroska);
2961 // Try resyncing until we find an EBML_STOP type element.
2962 while (res != 1) {
2963 res = matroska_resync(matroska, pos);
2964 if (res < 0)
2965 goto fail;
2966 pos = avio_tell(matroska->ctx->pb);
2967 res = ebml_parse(matroska, matroska_segment, matroska);
2968 if (res == AVERROR(EIO)) // EOF is translated to EIO, this exists the loop on EOF
2969 goto fail;
2970 }
2971 /* Set data_offset as it might be needed later by seek_frame_generic. */
2972 if (matroska->current_id == MATROSKA_ID_CLUSTER)
2973 s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2974 matroska_execute_seekhead(matroska);
2975
2976 if (!matroska->time_scale)
2977 matroska->time_scale = 1000000;
2978 if (matroska->duration)
2979 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2980 1000 / AV_TIME_BASE;
2981 av_dict_set(&s->metadata, "title", matroska->title, 0);
2982 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2983
2984 if (matroska->date_utc.size == 8)
2985 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2986
2987 res = matroska_parse_tracks(s);
2988 if (res < 0)
2989 goto fail;
2990
2991 attachments = attachments_list->elem;
2992 for (j = 0; j < attachments_list->nb_elem; j++) {
2993 if (!(attachments[j].filename && attachments[j].mime &&
2994 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2995 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2996 } else {
2997 AVStream *st = avformat_new_stream(s, NULL);
2998 if (!st)
2999 break;
3000 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
3001 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
3002 if (attachments[j].description)
3003 av_dict_set(&st->metadata, "title", attachments[j].description, 0);
3004 st->codecpar->codec_id = AV_CODEC_ID_NONE;
3005
3006 for (i = 0; mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
3007 if (av_strstart(attachments[j].mime, mkv_image_mime_tags[i].str, NULL)) {
3008 st->codecpar->codec_id = mkv_image_mime_tags[i].id;
3009 break;
3010 }
3011 }
3012
3013 attachments[j].stream = st;
3014
3015 if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
3016 AVPacket *pkt = &st->attached_pic;
3017
3018 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
3019 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
3020
3021 av_packet_unref(pkt);
3022 pkt->buf = attachments[j].bin.buf;
3023 attachments[j].bin.buf = NULL;
3024 pkt->data = attachments[j].bin.data;
3025 pkt->size = attachments[j].bin.size;
3026 pkt->stream_index = st->index;
3027 pkt->flags |= AV_PKT_FLAG_KEY;
3028 } else {
3029 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
3030 if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
3031 break;
3032 memcpy(st->codecpar->extradata, attachments[j].bin.data,
3033 attachments[j].bin.size);
3034
3035 for (i = 0; mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
3036 if (av_strstart(attachments[j].mime, mkv_mime_tags[i].str, NULL)) {
3037 st->codecpar->codec_id = mkv_mime_tags[i].id;
3038 break;
3039 }
3040 }
3041 }
3042 }
3043 }
3044
3045 chapters = chapters_list->elem;
3046 for (i = 0; i < chapters_list->nb_elem; i++)
3047 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
3048 (max_start == 0 || chapters[i].start > max_start)) {
3049 chapters[i].chapter =
3050 avpriv_new_chapter(s, chapters[i].uid,
3051 (AVRational) { 1, 1000000000 },
3052 chapters[i].start, chapters[i].end,
3053 chapters[i].title);
3054 max_start = chapters[i].start;
3055 }
3056
3057 matroska_add_index_entries(matroska);
3058
3059 matroska_convert_tags(s);
3060
3061 return 0;
3062 fail:
3063 matroska_read_close(s);
3064 return res;
3065 }
3066
3067 /*
3068 * Put one packet in an application-supplied AVPacket struct.
3069 * Returns 0 on success or -1 on failure.
3070 */
matroska_deliver_packet(MatroskaDemuxContext * matroska,AVPacket * pkt)3071 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
3072 AVPacket *pkt)
3073 {
3074 if (matroska->queue) {
3075 MatroskaTrack *tracks = matroska->tracks.elem;
3076 MatroskaTrack *track;
3077
3078 avpriv_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
3079 track = &tracks[pkt->stream_index];
3080 if (track->has_palette) {
3081 uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
3082 if (!pal) {
3083 av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
3084 } else {
3085 memcpy(pal, track->palette, AVPALETTE_SIZE);
3086 }
3087 track->has_palette = 0;
3088 }
3089 return 0;
3090 }
3091
3092 return -1;
3093 }
3094
3095 /*
3096 * Free all packets in our internal queue.
3097 */
matroska_clear_queue(MatroskaDemuxContext * matroska)3098 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
3099 {
3100 avpriv_packet_list_free(&matroska->queue, &matroska->queue_end);
3101 }
3102
matroska_parse_laces(MatroskaDemuxContext * matroska,uint8_t ** buf,int size,int type,AVIOContext * pb,uint32_t lace_size[256],int * laces)3103 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
3104 int size, int type, AVIOContext *pb,
3105 uint32_t lace_size[256], int *laces)
3106 {
3107 int n;
3108 uint8_t *data = *buf;
3109
3110 if (!type) {
3111 *laces = 1;
3112 lace_size[0] = size;
3113 return 0;
3114 }
3115
3116 if (size <= 0)
3117 return AVERROR_INVALIDDATA;
3118
3119 *laces = *data + 1;
3120 data += 1;
3121 size -= 1;
3122
3123 switch (type) {
3124 case 0x1: /* Xiph lacing */
3125 {
3126 uint8_t temp;
3127 uint32_t total = 0;
3128 for (n = 0; n < *laces - 1; n++) {
3129 lace_size[n] = 0;
3130
3131 do {
3132 if (size <= total)
3133 return AVERROR_INVALIDDATA;
3134 temp = *data;
3135 total += temp;
3136 lace_size[n] += temp;
3137 data += 1;
3138 size -= 1;
3139 } while (temp == 0xff);
3140 }
3141 if (size < total)
3142 return AVERROR_INVALIDDATA;
3143
3144 lace_size[n] = size - total;
3145 break;
3146 }
3147
3148 case 0x2: /* fixed-size lacing */
3149 if (size % (*laces))
3150 return AVERROR_INVALIDDATA;
3151 for (n = 0; n < *laces; n++)
3152 lace_size[n] = size / *laces;
3153 break;
3154
3155 case 0x3: /* EBML lacing */
3156 {
3157 uint64_t num;
3158 uint64_t total;
3159 int offset;
3160
3161 avio_skip(pb, 4);
3162
3163 n = ebml_read_num(matroska, pb, 8, &num, 1);
3164 if (n < 0)
3165 return n;
3166 if (num > INT_MAX)
3167 return AVERROR_INVALIDDATA;
3168
3169 total = lace_size[0] = num;
3170 offset = n;
3171 for (n = 1; n < *laces - 1; n++) {
3172 int64_t snum;
3173 int r;
3174 r = matroska_ebmlnum_sint(matroska, pb, &snum);
3175 if (r < 0)
3176 return r;
3177 if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3178 return AVERROR_INVALIDDATA;
3179
3180 lace_size[n] = lace_size[n - 1] + snum;
3181 total += lace_size[n];
3182 offset += r;
3183 }
3184 data += offset;
3185 size -= offset;
3186 if (size < total)
3187 return AVERROR_INVALIDDATA;
3188
3189 lace_size[*laces - 1] = size - total;
3190 break;
3191 }
3192 }
3193
3194 *buf = data;
3195
3196 return 0;
3197 }
3198
matroska_parse_rm_audio(MatroskaDemuxContext * matroska,MatroskaTrack * track,AVStream * st,uint8_t * data,int size,uint64_t timecode,int64_t pos)3199 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
3200 MatroskaTrack *track, AVStream *st,
3201 uint8_t *data, int size, uint64_t timecode,
3202 int64_t pos)
3203 {
3204 const int a = st->codecpar->block_align;
3205 const int sps = track->audio.sub_packet_size;
3206 const int cfs = track->audio.coded_framesize;
3207 const int h = track->audio.sub_packet_h;
3208 const int w = track->audio.frame_size;
3209 int y = track->audio.sub_packet_cnt;
3210 int x;
3211
3212 if (!track->audio.pkt_cnt) {
3213 if (track->audio.sub_packet_cnt == 0)
3214 track->audio.buf_timecode = timecode;
3215 if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3216 if (size < cfs * h / 2) {
3217 av_log(matroska->ctx, AV_LOG_ERROR,
3218 "Corrupt int4 RM-style audio packet size\n");
3219 return AVERROR_INVALIDDATA;
3220 }
3221 for (x = 0; x < h / 2; x++)
3222 memcpy(track->audio.buf + x * 2 * w + y * cfs,
3223 data + x * cfs, cfs);
3224 } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3225 if (size < w) {
3226 av_log(matroska->ctx, AV_LOG_ERROR,
3227 "Corrupt sipr RM-style audio packet size\n");
3228 return AVERROR_INVALIDDATA;
3229 }
3230 memcpy(track->audio.buf + y * w, data, w);
3231 } else {
3232 if (size < w) {
3233 av_log(matroska->ctx, AV_LOG_ERROR,
3234 "Corrupt generic RM-style audio packet size\n");
3235 return AVERROR_INVALIDDATA;
3236 }
3237 for (x = 0; x < w / sps; x++)
3238 memcpy(track->audio.buf +
3239 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3240 data + x * sps, sps);
3241 }
3242
3243 if (++track->audio.sub_packet_cnt >= h) {
3244 if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3245 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3246 track->audio.sub_packet_cnt = 0;
3247 track->audio.pkt_cnt = h * w / a;
3248 }
3249 }
3250
3251 while (track->audio.pkt_cnt) {
3252 int ret;
3253 AVPacket *pkt = matroska->pkt;
3254
3255 ret = av_new_packet(pkt, a);
3256 if (ret < 0) {
3257 return ret;
3258 }
3259 memcpy(pkt->data,
3260 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3261 a);
3262 pkt->pts = track->audio.buf_timecode;
3263 track->audio.buf_timecode = AV_NOPTS_VALUE;
3264 pkt->pos = pos;
3265 pkt->stream_index = st->index;
3266 ret = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3267 if (ret < 0) {
3268 av_packet_unref(pkt);
3269 return AVERROR(ENOMEM);
3270 }
3271 }
3272
3273 return 0;
3274 }
3275
3276 /* reconstruct full wavpack blocks from mangled matroska ones */
matroska_parse_wavpack(MatroskaTrack * track,uint8_t ** data,int * size)3277 static int matroska_parse_wavpack(MatroskaTrack *track,
3278 uint8_t **data, int *size)
3279 {
3280 uint8_t *dst = NULL;
3281 uint8_t *src = *data;
3282 int dstlen = 0;
3283 int srclen = *size;
3284 uint32_t samples;
3285 uint16_t ver;
3286 int ret, offset = 0;
3287
3288 if (srclen < 12)
3289 return AVERROR_INVALIDDATA;
3290
3291 av_assert1(track->stream->codecpar->extradata_size >= 2);
3292 ver = AV_RL16(track->stream->codecpar->extradata);
3293
3294 samples = AV_RL32(src);
3295 src += 4;
3296 srclen -= 4;
3297
3298 while (srclen >= 8) {
3299 int multiblock;
3300 uint32_t blocksize;
3301 uint8_t *tmp;
3302
3303 uint32_t flags = AV_RL32(src);
3304 uint32_t crc = AV_RL32(src + 4);
3305 src += 8;
3306 srclen -= 8;
3307
3308 multiblock = (flags & 0x1800) != 0x1800;
3309 if (multiblock) {
3310 if (srclen < 4) {
3311 ret = AVERROR_INVALIDDATA;
3312 goto fail;
3313 }
3314 blocksize = AV_RL32(src);
3315 src += 4;
3316 srclen -= 4;
3317 } else
3318 blocksize = srclen;
3319
3320 if (blocksize > srclen) {
3321 ret = AVERROR_INVALIDDATA;
3322 goto fail;
3323 }
3324
3325 tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3326 if (!tmp) {
3327 ret = AVERROR(ENOMEM);
3328 goto fail;
3329 }
3330 dst = tmp;
3331 dstlen += blocksize + 32;
3332
3333 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3334 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3335 AV_WL16(dst + offset + 8, ver); // version
3336 AV_WL16(dst + offset + 10, 0); // track/index_no
3337 AV_WL32(dst + offset + 12, 0); // total samples
3338 AV_WL32(dst + offset + 16, 0); // block index
3339 AV_WL32(dst + offset + 20, samples); // number of samples
3340 AV_WL32(dst + offset + 24, flags); // flags
3341 AV_WL32(dst + offset + 28, crc); // crc
3342 memcpy(dst + offset + 32, src, blocksize); // block data
3343
3344 src += blocksize;
3345 srclen -= blocksize;
3346 offset += blocksize + 32;
3347 }
3348
3349 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3350
3351 *data = dst;
3352 *size = dstlen;
3353
3354 return 0;
3355
3356 fail:
3357 av_freep(&dst);
3358 return ret;
3359 }
3360
matroska_parse_prores(MatroskaTrack * track,uint8_t ** data,int * size)3361 static int matroska_parse_prores(MatroskaTrack *track,
3362 uint8_t **data, int *size)
3363 {
3364 uint8_t *dst;
3365 int dstlen = *size + 8;
3366
3367 dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3368 if (!dst)
3369 return AVERROR(ENOMEM);
3370
3371 AV_WB32(dst, dstlen);
3372 AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3373 memcpy(dst + 8, *data, dstlen - 8);
3374 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3375
3376 *data = dst;
3377 *size = dstlen;
3378
3379 return 0;
3380 }
3381
matroska_parse_webvtt(MatroskaDemuxContext * matroska,MatroskaTrack * track,AVStream * st,uint8_t * data,int data_len,uint64_t timecode,uint64_t duration,int64_t pos)3382 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
3383 MatroskaTrack *track,
3384 AVStream *st,
3385 uint8_t *data, int data_len,
3386 uint64_t timecode,
3387 uint64_t duration,
3388 int64_t pos)
3389 {
3390 AVPacket *pkt = matroska->pkt;
3391 uint8_t *id, *settings, *text, *buf;
3392 int id_len, settings_len, text_len;
3393 uint8_t *p, *q;
3394 int err;
3395
3396 if (data_len <= 0)
3397 return AVERROR_INVALIDDATA;
3398
3399 p = data;
3400 q = data + data_len;
3401
3402 id = p;
3403 id_len = -1;
3404 while (p < q) {
3405 if (*p == '\r' || *p == '\n') {
3406 id_len = p - id;
3407 if (*p == '\r')
3408 p++;
3409 break;
3410 }
3411 p++;
3412 }
3413
3414 if (p >= q || *p != '\n')
3415 return AVERROR_INVALIDDATA;
3416 p++;
3417
3418 settings = p;
3419 settings_len = -1;
3420 while (p < q) {
3421 if (*p == '\r' || *p == '\n') {
3422 settings_len = p - settings;
3423 if (*p == '\r')
3424 p++;
3425 break;
3426 }
3427 p++;
3428 }
3429
3430 if (p >= q || *p != '\n')
3431 return AVERROR_INVALIDDATA;
3432 p++;
3433
3434 text = p;
3435 text_len = q - p;
3436 while (text_len > 0) {
3437 const int len = text_len - 1;
3438 const uint8_t c = p[len];
3439 if (c != '\r' && c != '\n')
3440 break;
3441 text_len = len;
3442 }
3443
3444 if (text_len <= 0)
3445 return AVERROR_INVALIDDATA;
3446
3447 err = av_new_packet(pkt, text_len);
3448 if (err < 0) {
3449 return err;
3450 }
3451
3452 memcpy(pkt->data, text, text_len);
3453
3454 if (id_len > 0) {
3455 buf = av_packet_new_side_data(pkt,
3456 AV_PKT_DATA_WEBVTT_IDENTIFIER,
3457 id_len);
3458 if (!buf) {
3459 av_packet_unref(pkt);
3460 return AVERROR(ENOMEM);
3461 }
3462 memcpy(buf, id, id_len);
3463 }
3464
3465 if (settings_len > 0) {
3466 buf = av_packet_new_side_data(pkt,
3467 AV_PKT_DATA_WEBVTT_SETTINGS,
3468 settings_len);
3469 if (!buf) {
3470 av_packet_unref(pkt);
3471 return AVERROR(ENOMEM);
3472 }
3473 memcpy(buf, settings, settings_len);
3474 }
3475
3476 // Do we need this for subtitles?
3477 // pkt->flags = AV_PKT_FLAG_KEY;
3478
3479 pkt->stream_index = st->index;
3480 pkt->pts = timecode;
3481
3482 // Do we need this for subtitles?
3483 // pkt->dts = timecode;
3484
3485 pkt->duration = duration;
3486 pkt->pos = pos;
3487
3488 err = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3489 if (err < 0) {
3490 av_packet_unref(pkt);
3491 return AVERROR(ENOMEM);
3492 }
3493
3494 return 0;
3495 }
3496
matroska_parse_frame(MatroskaDemuxContext * matroska,MatroskaTrack * track,AVStream * st,AVBufferRef * buf,uint8_t * data,int pkt_size,uint64_t timecode,uint64_t lace_duration,int64_t pos,int is_keyframe,uint8_t * additional,uint64_t additional_id,int additional_size,int64_t discard_padding)3497 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
3498 MatroskaTrack *track, AVStream *st,
3499 AVBufferRef *buf, uint8_t *data, int pkt_size,
3500 uint64_t timecode, uint64_t lace_duration,
3501 int64_t pos, int is_keyframe,
3502 uint8_t *additional, uint64_t additional_id, int additional_size,
3503 int64_t discard_padding)
3504 {
3505 uint8_t *pkt_data = data;
3506 int res = 0;
3507 AVPacket *pkt = matroska->pkt;
3508
3509 if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3510 res = matroska_parse_wavpack(track, &pkt_data, &pkt_size);
3511 if (res < 0) {
3512 av_log(matroska->ctx, AV_LOG_ERROR,
3513 "Error parsing a wavpack block.\n");
3514 goto fail;
3515 }
3516 if (!buf)
3517 av_freep(&data);
3518 buf = NULL;
3519 }
3520
3521 if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3522 AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3523 res = matroska_parse_prores(track, &pkt_data, &pkt_size);
3524 if (res < 0) {
3525 av_log(matroska->ctx, AV_LOG_ERROR,
3526 "Error parsing a prores block.\n");
3527 goto fail;
3528 }
3529 if (!buf)
3530 av_freep(&data);
3531 buf = NULL;
3532 }
3533
3534 if (!pkt_size && !additional_size)
3535 goto no_output;
3536
3537 av_packet_unref(pkt);
3538 if (!buf)
3539 pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3540 NULL, NULL, 0);
3541 else
3542 pkt->buf = av_buffer_ref(buf);
3543
3544 if (!pkt->buf) {
3545 res = AVERROR(ENOMEM);
3546 goto fail;
3547 }
3548
3549 pkt->data = pkt_data;
3550 pkt->size = pkt_size;
3551 pkt->flags = is_keyframe;
3552 pkt->stream_index = st->index;
3553
3554 if (additional_size > 0) {
3555 uint8_t *side_data = av_packet_new_side_data(pkt,
3556 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
3557 additional_size + 8);
3558 if (!side_data) {
3559 av_packet_unref(pkt);
3560 return AVERROR(ENOMEM);
3561 }
3562 AV_WB64(side_data, additional_id);
3563 memcpy(side_data + 8, additional, additional_size);
3564 }
3565
3566 if (discard_padding) {
3567 uint8_t *side_data = av_packet_new_side_data(pkt,
3568 AV_PKT_DATA_SKIP_SAMPLES,
3569 10);
3570 if (!side_data) {
3571 av_packet_unref(pkt);
3572 return AVERROR(ENOMEM);
3573 }
3574 discard_padding = av_rescale_q(discard_padding,
3575 (AVRational){1, 1000000000},
3576 (AVRational){1, st->codecpar->sample_rate});
3577 if (discard_padding > 0) {
3578 AV_WL32(side_data + 4, discard_padding);
3579 } else {
3580 AV_WL32(side_data, -discard_padding);
3581 }
3582 }
3583
3584 if (track->ms_compat)
3585 pkt->dts = timecode;
3586 else
3587 pkt->pts = timecode;
3588 pkt->pos = pos;
3589 pkt->duration = lace_duration;
3590
3591 #if FF_API_CONVERGENCE_DURATION
3592 FF_DISABLE_DEPRECATION_WARNINGS
3593 if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3594 pkt->convergence_duration = lace_duration;
3595 }
3596 FF_ENABLE_DEPRECATION_WARNINGS
3597 #endif
3598
3599 res = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3600 if (res < 0) {
3601 av_packet_unref(pkt);
3602 return AVERROR(ENOMEM);
3603 }
3604
3605 return 0;
3606
3607 no_output:
3608 fail:
3609 if (!buf)
3610 av_free(pkt_data);
3611 return res;
3612 }
3613
matroska_parse_block(MatroskaDemuxContext * matroska,AVBufferRef * buf,uint8_t * data,int size,int64_t pos,uint64_t cluster_time,uint64_t block_duration,int is_keyframe,uint8_t * additional,uint64_t additional_id,int additional_size,int64_t cluster_pos,int64_t discard_padding)3614 static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf, uint8_t *data,
3615 int size, int64_t pos, uint64_t cluster_time,
3616 uint64_t block_duration, int is_keyframe,
3617 uint8_t *additional, uint64_t additional_id, int additional_size,
3618 int64_t cluster_pos, int64_t discard_padding)
3619 {
3620 uint64_t timecode = AV_NOPTS_VALUE;
3621 MatroskaTrack *track;
3622 AVIOContext pb;
3623 int res = 0;
3624 AVStream *st;
3625 int16_t block_time;
3626 uint32_t lace_size[256];
3627 int n, flags, laces = 0;
3628 uint64_t num;
3629 int trust_default_duration;
3630
3631 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3632
3633 if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3634 return n;
3635 data += n;
3636 size -= n;
3637
3638 track = matroska_find_track_by_num(matroska, num);
3639 if (!track || size < 3)
3640 return AVERROR_INVALIDDATA;
3641
3642 if (!(st = track->stream)) {
3643 av_log(matroska->ctx, AV_LOG_VERBOSE,
3644 "No stream associated to TrackNumber %"PRIu64". "
3645 "Ignoring Block with this TrackNumber.\n", num);
3646 return 0;
3647 }
3648
3649 if (st->discard >= AVDISCARD_ALL)
3650 return res;
3651 if (block_duration > INT64_MAX)
3652 block_duration = INT64_MAX;
3653
3654 block_time = sign_extend(AV_RB16(data), 16);
3655 data += 2;
3656 flags = *data++;
3657 size -= 3;
3658 if (is_keyframe == -1)
3659 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3660
3661 if (cluster_time != (uint64_t) -1 &&
3662 (block_time >= 0 || cluster_time >= -block_time)) {
3663 uint64_t timecode_cluster_in_track_tb = (double) cluster_time / track->time_scale;
3664 timecode = timecode_cluster_in_track_tb + block_time - track->codec_delay_in_track_tb;
3665 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3666 timecode < track->end_timecode)
3667 is_keyframe = 0; /* overlapping subtitles are not key frame */
3668 if (is_keyframe) {
3669 ff_reduce_index(matroska->ctx, st->index);
3670 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3671 AVINDEX_KEYFRAME);
3672 }
3673 }
3674
3675 if (matroska->skip_to_keyframe &&
3676 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3677 // Compare signed timecodes. Timecode may be negative due to codec delay
3678 // offset. We don't support timestamps greater than int64_t anyway - see
3679 // AVPacket's pts.
3680 if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3681 return res;
3682 if (is_keyframe)
3683 matroska->skip_to_keyframe = 0;
3684 else if (!st->internal->skip_to_keyframe) {
3685 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3686 matroska->skip_to_keyframe = 0;
3687 }
3688 }
3689
3690 res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3691 &pb, lace_size, &laces);
3692 if (res < 0) {
3693 av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3694 return res;
3695 }
3696
3697 trust_default_duration = track->default_duration != 0;
3698 if (track->audio.samplerate == 8000 && trust_default_duration) {
3699 // If this is needed for more codecs, then add them here
3700 if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3701 if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3702 trust_default_duration = 0;
3703 }
3704 }
3705
3706 if (!block_duration && trust_default_duration)
3707 block_duration = track->default_duration * laces / matroska->time_scale;
3708
3709 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3710 track->end_timecode =
3711 FFMAX(track->end_timecode, timecode + block_duration);
3712
3713 for (n = 0; n < laces; n++) {
3714 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3715 uint8_t *out_data = data;
3716 int out_size = lace_size[n];
3717
3718 if (track->needs_decoding) {
3719 res = matroska_decode_buffer(&out_data, &out_size, track);
3720 if (res < 0)
3721 return res;
3722 /* Given that we are here means that out_data is no longer
3723 * owned by buf, so set it to NULL. This depends upon
3724 * zero-length header removal compression being ignored. */
3725 av_assert1(out_data != data);
3726 buf = NULL;
3727 }
3728
3729 if (track->audio.buf) {
3730 res = matroska_parse_rm_audio(matroska, track, st,
3731 out_data, out_size,
3732 timecode, pos);
3733 if (!buf)
3734 av_free(out_data);
3735 if (res)
3736 return res;
3737 } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3738 res = matroska_parse_webvtt(matroska, track, st,
3739 out_data, out_size,
3740 timecode, lace_duration,
3741 pos);
3742 if (!buf)
3743 av_free(out_data);
3744 if (res)
3745 return res;
3746 } else {
3747 res = matroska_parse_frame(matroska, track, st, buf, out_data,
3748 out_size, timecode, lace_duration,
3749 pos, !n ? is_keyframe : 0,
3750 additional, additional_id, additional_size,
3751 discard_padding);
3752 if (res)
3753 return res;
3754 }
3755
3756 if (timecode != AV_NOPTS_VALUE)
3757 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3758 data += lace_size[n];
3759 }
3760
3761 return 0;
3762 }
3763
matroska_parse_cluster(MatroskaDemuxContext * matroska)3764 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
3765 {
3766 MatroskaCluster *cluster = &matroska->current_cluster;
3767 MatroskaBlock *block = &cluster->block;
3768 int res;
3769
3770 av_assert0(matroska->num_levels <= 2);
3771
3772 if (matroska->num_levels == 1) {
3773 res = ebml_parse(matroska, matroska_segment, NULL);
3774
3775 if (res == 1) {
3776 /* Found a cluster: subtract the size of the ID already read. */
3777 cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3778
3779 res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3780 if (res < 0)
3781 return res;
3782 }
3783 }
3784
3785 if (matroska->num_levels == 2) {
3786 /* We are inside a cluster. */
3787 res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3788
3789 if (res >= 0 && block->bin.size > 0) {
3790 int is_keyframe = block->non_simple ? block->reference.count == 0 : -1;
3791 uint8_t* additional = block->additional.size > 0 ?
3792 block->additional.data : NULL;
3793
3794 res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3795 block->bin.size, block->bin.pos,
3796 cluster->timecode, block->duration,
3797 is_keyframe, additional, block->additional_id,
3798 block->additional.size, cluster->pos,
3799 block->discard_padding);
3800 }
3801
3802 ebml_free(matroska_blockgroup, block);
3803 memset(block, 0, sizeof(*block));
3804 } else if (!matroska->num_levels) {
3805 if (!avio_feof(matroska->ctx->pb)) {
3806 avio_r8(matroska->ctx->pb);
3807 if (!avio_feof(matroska->ctx->pb)) {
3808 av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3809 "end of segment.\n");
3810 return AVERROR_INVALIDDATA;
3811 }
3812 }
3813 matroska->done = 1;
3814 return AVERROR_EOF;
3815 }
3816
3817 return res;
3818 }
3819
matroska_read_packet(AVFormatContext * s,AVPacket * pkt)3820 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
3821 {
3822 MatroskaDemuxContext *matroska = s->priv_data;
3823 int ret = 0;
3824
3825 if (matroska->resync_pos == -1) {
3826 // This can only happen if generic seeking has been used.
3827 matroska->resync_pos = avio_tell(s->pb);
3828 }
3829
3830 while (matroska_deliver_packet(matroska, pkt)) {
3831 if (matroska->done)
3832 return (ret < 0) ? ret : AVERROR_EOF;
3833 if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3834 ret = matroska_resync(matroska, matroska->resync_pos);
3835 }
3836
3837 return 0;
3838 }
3839
matroska_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)3840 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3841 int64_t timestamp, int flags)
3842 {
3843 MatroskaDemuxContext *matroska = s->priv_data;
3844 MatroskaTrack *tracks = NULL;
3845 AVStream *st = s->streams[stream_index];
3846 int i, index;
3847
3848 /* Parse the CUES now since we need the index data to seek. */
3849 if (matroska->cues_parsing_deferred > 0) {
3850 matroska->cues_parsing_deferred = 0;
3851 matroska_parse_cues(matroska);
3852 }
3853
3854 if (!st->nb_index_entries)
3855 goto err;
3856 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3857
3858 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3859 matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3860 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3861 matroska_clear_queue(matroska);
3862 if (matroska_parse_cluster(matroska) < 0)
3863 break;
3864 }
3865 }
3866
3867 matroska_clear_queue(matroska);
3868 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3869 goto err;
3870
3871 tracks = matroska->tracks.elem;
3872 for (i = 0; i < matroska->tracks.nb_elem; i++) {
3873 tracks[i].audio.pkt_cnt = 0;
3874 tracks[i].audio.sub_packet_cnt = 0;
3875 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3876 tracks[i].end_timecode = 0;
3877 }
3878
3879 /* We seek to a level 1 element, so set the appropriate status. */
3880 matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3881 if (flags & AVSEEK_FLAG_ANY) {
3882 st->internal->skip_to_keyframe = 0;
3883 matroska->skip_to_timecode = timestamp;
3884 } else {
3885 st->internal->skip_to_keyframe = 1;
3886 matroska->skip_to_timecode = st->index_entries[index].timestamp;
3887 }
3888 matroska->skip_to_keyframe = 1;
3889 matroska->done = 0;
3890 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3891 return 0;
3892 err:
3893 // slightly hackish but allows proper fallback to
3894 // the generic seeking code.
3895 matroska_reset_status(matroska, 0, -1);
3896 matroska->resync_pos = -1;
3897 matroska_clear_queue(matroska);
3898 st->internal->skip_to_keyframe =
3899 matroska->skip_to_keyframe = 0;
3900 matroska->done = 0;
3901 return -1;
3902 }
3903
matroska_read_close(AVFormatContext * s)3904 static int matroska_read_close(AVFormatContext *s)
3905 {
3906 MatroskaDemuxContext *matroska = s->priv_data;
3907 MatroskaTrack *tracks = matroska->tracks.elem;
3908 int n;
3909
3910 matroska_clear_queue(matroska);
3911 av_packet_free(&matroska->pkt);
3912
3913 for (n = 0; n < matroska->tracks.nb_elem; n++)
3914 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3915 av_freep(&tracks[n].audio.buf);
3916 ebml_free(matroska_segment, matroska);
3917
3918 return 0;
3919 }
3920
3921 typedef struct {
3922 int64_t start_time_ns;
3923 int64_t end_time_ns;
3924 int64_t start_offset;
3925 int64_t end_offset;
3926 } CueDesc;
3927
3928 /* This function searches all the Cues and returns the CueDesc corresponding to
3929 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3930 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3931 */
get_cue_desc(AVFormatContext * s,int64_t ts,int64_t cues_start)3932 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3933 MatroskaDemuxContext *matroska = s->priv_data;
3934 CueDesc cue_desc;
3935 int i;
3936 int nb_index_entries = s->streams[0]->nb_index_entries;
3937 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3938 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3939 for (i = 1; i < nb_index_entries; i++) {
3940 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3941 index_entries[i].timestamp * matroska->time_scale > ts) {
3942 break;
3943 }
3944 }
3945 --i;
3946 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3947 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3948 if (i != nb_index_entries - 1) {
3949 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3950 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3951 } else {
3952 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3953 // FIXME: this needs special handling for files where Cues appear
3954 // before Clusters. the current logic assumes Cues appear after
3955 // Clusters.
3956 cue_desc.end_offset = cues_start - matroska->segment_start;
3957 }
3958 return cue_desc;
3959 }
3960
webm_clusters_start_with_keyframe(AVFormatContext * s)3961 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3962 {
3963 MatroskaDemuxContext *matroska = s->priv_data;
3964 uint32_t id = matroska->current_id;
3965 int64_t cluster_pos, before_pos;
3966 int index, rv = 1;
3967 if (s->streams[0]->nb_index_entries <= 0) return 0;
3968 // seek to the first cluster using cues.
3969 index = av_index_search_timestamp(s->streams[0], 0, 0);
3970 if (index < 0) return 0;
3971 cluster_pos = s->streams[0]->index_entries[index].pos;
3972 before_pos = avio_tell(s->pb);
3973 while (1) {
3974 uint64_t cluster_id, cluster_length;
3975 int read;
3976 AVPacket *pkt;
3977 avio_seek(s->pb, cluster_pos, SEEK_SET);
3978 // read cluster id and length
3979 read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3980 if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3981 break;
3982 read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3983 if (read < 0)
3984 break;
3985
3986 matroska_reset_status(matroska, 0, cluster_pos);
3987 matroska_clear_queue(matroska);
3988 if (matroska_parse_cluster(matroska) < 0 ||
3989 !matroska->queue) {
3990 break;
3991 }
3992 pkt = &matroska->queue->pkt;
3993 // 4 + read is the length of the cluster id and the cluster length field.
3994 cluster_pos += 4 + read + cluster_length;
3995 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3996 rv = 0;
3997 break;
3998 }
3999 }
4000
4001 /* Restore the status after matroska_read_header: */
4002 matroska_reset_status(matroska, id, before_pos);
4003
4004 return rv;
4005 }
4006
buffer_size_after_time_downloaded(int64_t time_ns,double search_sec,int64_t bps,double min_buffer,double * buffer,double * sec_to_download,AVFormatContext * s,int64_t cues_start)4007 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
4008 double min_buffer, double* buffer,
4009 double* sec_to_download, AVFormatContext *s,
4010 int64_t cues_start)
4011 {
4012 double nano_seconds_per_second = 1000000000.0;
4013 double time_sec = time_ns / nano_seconds_per_second;
4014 int rv = 0;
4015 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
4016 int64_t end_time_ns = time_ns + time_to_search_ns;
4017 double sec_downloaded = 0.0;
4018 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
4019 if (desc_curr.start_time_ns == -1)
4020 return -1;
4021 *sec_to_download = 0.0;
4022
4023 // Check for non cue start time.
4024 if (time_ns > desc_curr.start_time_ns) {
4025 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
4026 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
4027 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
4028 double timeToDownload = (cueBytes * 8.0) / bps;
4029
4030 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
4031 *sec_to_download += timeToDownload;
4032
4033 // Check if the search ends within the first cue.
4034 if (desc_curr.end_time_ns >= end_time_ns) {
4035 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
4036 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
4037 sec_downloaded = percent_to_sub * sec_downloaded;
4038 *sec_to_download = percent_to_sub * *sec_to_download;
4039 }
4040
4041 if ((sec_downloaded + *buffer) <= min_buffer) {
4042 return 1;
4043 }
4044
4045 // Get the next Cue.
4046 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4047 }
4048
4049 while (desc_curr.start_time_ns != -1) {
4050 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
4051 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
4052 double desc_sec = desc_ns / nano_seconds_per_second;
4053 double bits = (desc_bytes * 8.0);
4054 double time_to_download = bits / bps;
4055
4056 sec_downloaded += desc_sec - time_to_download;
4057 *sec_to_download += time_to_download;
4058
4059 if (desc_curr.end_time_ns >= end_time_ns) {
4060 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
4061 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
4062 sec_downloaded = percent_to_sub * sec_downloaded;
4063 *sec_to_download = percent_to_sub * *sec_to_download;
4064
4065 if ((sec_downloaded + *buffer) <= min_buffer)
4066 rv = 1;
4067 break;
4068 }
4069
4070 if ((sec_downloaded + *buffer) <= min_buffer) {
4071 rv = 1;
4072 break;
4073 }
4074
4075 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4076 }
4077 *buffer = *buffer + sec_downloaded;
4078 return rv;
4079 }
4080
4081 /* This function computes the bandwidth of the WebM file with the help of
4082 * buffer_size_after_time_downloaded() function. Both of these functions are
4083 * adapted from WebM Tools project and are adapted to work with FFmpeg's
4084 * Matroska parsing mechanism.
4085 *
4086 * Returns the bandwidth of the file on success; -1 on error.
4087 * */
webm_dash_manifest_compute_bandwidth(AVFormatContext * s,int64_t cues_start)4088 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
4089 {
4090 MatroskaDemuxContext *matroska = s->priv_data;
4091 AVStream *st = s->streams[0];
4092 double bandwidth = 0.0;
4093 int i;
4094
4095 for (i = 0; i < st->nb_index_entries; i++) {
4096 int64_t prebuffer_ns = 1000000000;
4097 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
4098 double nano_seconds_per_second = 1000000000.0;
4099 int64_t prebuffered_ns = time_ns + prebuffer_ns;
4100 double prebuffer_bytes = 0.0;
4101 int64_t temp_prebuffer_ns = prebuffer_ns;
4102 int64_t pre_bytes, pre_ns;
4103 double pre_sec, prebuffer, bits_per_second;
4104 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
4105
4106 // Start with the first Cue.
4107 CueDesc desc_end = desc_beg;
4108
4109 // Figure out how much data we have downloaded for the prebuffer. This will
4110 // be used later to adjust the bits per sample to try.
4111 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
4112 // Prebuffered the entire Cue.
4113 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
4114 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
4115 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4116 }
4117 if (desc_end.start_time_ns == -1) {
4118 // The prebuffer is larger than the duration.
4119 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
4120 return -1;
4121 bits_per_second = 0.0;
4122 } else {
4123 // The prebuffer ends in the last Cue. Estimate how much data was
4124 // prebuffered.
4125 pre_bytes = desc_end.end_offset - desc_end.start_offset;
4126 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
4127 pre_sec = pre_ns / nano_seconds_per_second;
4128 prebuffer_bytes +=
4129 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
4130
4131 prebuffer = prebuffer_ns / nano_seconds_per_second;
4132
4133 // Set this to 0.0 in case our prebuffer buffers the entire video.
4134 bits_per_second = 0.0;
4135 do {
4136 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4137 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4138 double desc_sec = desc_ns / nano_seconds_per_second;
4139 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4140
4141 // Drop the bps by the percentage of bytes buffered.
4142 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4143 double mod_bits_per_second = calc_bits_per_second * percent;
4144
4145 if (prebuffer < desc_sec) {
4146 double search_sec =
4147 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4148
4149 // Add 1 so the bits per second should be a little bit greater than file
4150 // datarate.
4151 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4152 const double min_buffer = 0.0;
4153 double buffer = prebuffer;
4154 double sec_to_download = 0.0;
4155
4156 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4157 min_buffer, &buffer, &sec_to_download,
4158 s, cues_start);
4159 if (rv < 0) {
4160 return -1;
4161 } else if (rv == 0) {
4162 bits_per_second = (double)(bps);
4163 break;
4164 }
4165 }
4166
4167 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4168 } while (desc_end.start_time_ns != -1);
4169 }
4170 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4171 }
4172 return (int64_t)bandwidth;
4173 }
4174
webm_dash_manifest_cues(AVFormatContext * s,int64_t init_range)4175 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4176 {
4177 MatroskaDemuxContext *matroska = s->priv_data;
4178 EbmlList *seekhead_list = &matroska->seekhead;
4179 MatroskaSeekhead *seekhead = seekhead_list->elem;
4180 char *buf;
4181 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4182 int i;
4183 int end = 0;
4184
4185 // determine cues start and end positions
4186 for (i = 0; i < seekhead_list->nb_elem; i++)
4187 if (seekhead[i].id == MATROSKA_ID_CUES)
4188 break;
4189
4190 if (i >= seekhead_list->nb_elem) return -1;
4191
4192 before_pos = avio_tell(matroska->ctx->pb);
4193 cues_start = seekhead[i].pos + matroska->segment_start;
4194 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4195 // cues_end is computed as cues_start + cues_length + length of the
4196 // Cues element ID (i.e. 4) + EBML length of the Cues element.
4197 // cues_end is inclusive and the above sum is reduced by 1.
4198 uint64_t cues_length, cues_id;
4199 int bytes_read;
4200 bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4201 if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4202 return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4203 bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4204 if (bytes_read < 0)
4205 return bytes_read;
4206 cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4207 }
4208 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4209 if (cues_start == -1 || cues_end == -1) return -1;
4210
4211 // parse the cues
4212 matroska_parse_cues(matroska);
4213
4214 // cues start
4215 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4216
4217 // cues end
4218 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4219
4220 // if the file has cues at the start, fix up the init range so that
4221 // it does not include it
4222 if (cues_start <= init_range)
4223 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4224
4225 // bandwidth
4226 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4227 if (bandwidth < 0) return -1;
4228 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4229
4230 // check if all clusters start with key frames
4231 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
4232
4233 // store cue point timestamps as a comma separated list for checking subsegment alignment in
4234 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4235 buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4236 if (!buf) return -1;
4237 strcpy(buf, "");
4238 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4239 int ret = snprintf(buf + end, 20,
4240 "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4241 i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4242 if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4243 av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4244 av_free(buf);
4245 return AVERROR_INVALIDDATA;
4246 }
4247 end += ret;
4248 }
4249 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS,
4250 buf, AV_DICT_DONT_STRDUP_VAL);
4251
4252 return 0;
4253 }
4254
webm_dash_manifest_read_header(AVFormatContext * s)4255 static int webm_dash_manifest_read_header(AVFormatContext *s)
4256 {
4257 char *buf;
4258 int ret = matroska_read_header(s);
4259 int64_t init_range;
4260 MatroskaTrack *tracks;
4261 MatroskaDemuxContext *matroska = s->priv_data;
4262 if (ret) {
4263 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4264 return -1;
4265 }
4266 if (!matroska->tracks.nb_elem || !s->nb_streams) {
4267 av_log(s, AV_LOG_ERROR, "No track found\n");
4268 ret = AVERROR_INVALIDDATA;
4269 goto fail;
4270 }
4271
4272 if (!matroska->is_live) {
4273 buf = av_asprintf("%g", matroska->duration);
4274 if (!buf) {
4275 ret = AVERROR(ENOMEM);
4276 goto fail;
4277 }
4278 av_dict_set(&s->streams[0]->metadata, DURATION,
4279 buf, AV_DICT_DONT_STRDUP_VAL);
4280
4281 // initialization range
4282 // 5 is the offset of Cluster ID.
4283 init_range = avio_tell(s->pb) - 5;
4284 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4285 }
4286
4287 // basename of the file
4288 buf = strrchr(s->url, '/');
4289 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4290
4291 // track number
4292 tracks = matroska->tracks.elem;
4293 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4294
4295 // parse the cues and populate Cue related fields
4296 if (!matroska->is_live) {
4297 ret = webm_dash_manifest_cues(s, init_range);
4298 if (ret < 0) {
4299 av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4300 goto fail;
4301 }
4302 }
4303
4304 // use the bandwidth from the command line if it was provided
4305 if (matroska->bandwidth > 0) {
4306 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH,
4307 matroska->bandwidth, 0);
4308 }
4309 return 0;
4310 fail:
4311 matroska_read_close(s);
4312 return ret;
4313 }
4314
webm_dash_manifest_read_packet(AVFormatContext * s,AVPacket * pkt)4315 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
4316 {
4317 return AVERROR_EOF;
4318 }
4319
4320 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4321 static const AVOption options[] = {
4322 { "live", "flag indicating that the input is a live file that only has the headers.", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
4323 { "bandwidth", "bandwidth of this stream to be specified in the DASH manifest.", OFFSET(bandwidth), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
4324 { NULL },
4325 };
4326
4327 static const AVClass webm_dash_class = {
4328 .class_name = "WebM DASH Manifest demuxer",
4329 .item_name = av_default_item_name,
4330 .option = options,
4331 .version = LIBAVUTIL_VERSION_INT,
4332 };
4333
4334 AVInputFormat ff_matroska_demuxer = {
4335 .name = "matroska,webm",
4336 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4337 .extensions = "mkv,mk3d,mka,mks,webm",
4338 .priv_data_size = sizeof(MatroskaDemuxContext),
4339 .read_probe = matroska_probe,
4340 .read_header = matroska_read_header,
4341 .read_packet = matroska_read_packet,
4342 .read_close = matroska_read_close,
4343 .read_seek = matroska_read_seek,
4344 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4345 };
4346
4347 AVInputFormat ff_webm_dash_manifest_demuxer = {
4348 .name = "webm_dash_manifest",
4349 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4350 .priv_data_size = sizeof(MatroskaDemuxContext),
4351 .read_header = webm_dash_manifest_read_header,
4352 .read_packet = webm_dash_manifest_read_packet,
4353 .read_close = matroska_read_close,
4354 .priv_class = &webm_dash_class,
4355 };
4356