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
52 #include "avformat.h"
53 #include "avio_internal.h"
54 #include "internal.h"
55 #include "isom.h"
56 #include "matroska.h"
57 #include "oggdec.h"
58 /* For ff_codec_get_id(). */
59 #include "riff.h"
60 #include "rmsipr.h"
61
62 #if CONFIG_BZLIB
63 #include <bzlib.h>
64 #endif
65 #if CONFIG_ZLIB
66 #include <zlib.h>
67 #endif
68
69 #include "qtpalette.h"
70
71 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
72 #define NEEDS_CHECKING 2 /* Indicates that some error checks
73 * still need to be performed */
74 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
75 * syntax level used for parsing ended. */
76 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
77 * of unkown, potentially damaged data is encountered,
78 * it is considered an error. */
79 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
80 * to this many bytes of unknown data for the
81 * SKIP_THRESHOLD check. */
82
83 typedef enum {
84 EBML_NONE,
85 EBML_UINT,
86 EBML_SINT,
87 EBML_FLOAT,
88 EBML_STR,
89 EBML_UTF8,
90 EBML_BIN,
91 EBML_NEST,
92 EBML_LEVEL1,
93 EBML_STOP,
94 EBML_TYPE_COUNT
95 } EbmlType;
96
97 typedef const struct EbmlSyntax {
98 uint32_t id;
99 EbmlType type;
100 size_t list_elem_size;
101 size_t data_offset;
102 union {
103 int64_t i;
104 uint64_t u;
105 double f;
106 const char *s;
107 const struct EbmlSyntax *n;
108 } def;
109 } EbmlSyntax;
110
111 typedef struct EbmlList {
112 int nb_elem;
113 unsigned int alloc_elem_size;
114 void *elem;
115 } EbmlList;
116
117 typedef struct EbmlBin {
118 int size;
119 AVBufferRef *buf;
120 uint8_t *data;
121 int64_t pos;
122 } EbmlBin;
123
124 typedef struct Ebml {
125 uint64_t version;
126 uint64_t max_size;
127 uint64_t id_length;
128 char *doctype;
129 uint64_t doctype_version;
130 } Ebml;
131
132 typedef struct MatroskaTrackCompression {
133 uint64_t algo;
134 EbmlBin settings;
135 } MatroskaTrackCompression;
136
137 typedef struct MatroskaTrackEncryption {
138 uint64_t algo;
139 EbmlBin key_id;
140 } MatroskaTrackEncryption;
141
142 typedef struct MatroskaTrackEncoding {
143 uint64_t scope;
144 uint64_t type;
145 MatroskaTrackCompression compression;
146 MatroskaTrackEncryption encryption;
147 } MatroskaTrackEncoding;
148
149 typedef struct MatroskaMasteringMeta {
150 double r_x;
151 double r_y;
152 double g_x;
153 double g_y;
154 double b_x;
155 double b_y;
156 double white_x;
157 double white_y;
158 double max_luminance;
159 double min_luminance;
160 } MatroskaMasteringMeta;
161
162 typedef struct MatroskaTrackVideoColor {
163 uint64_t matrix_coefficients;
164 uint64_t bits_per_channel;
165 uint64_t chroma_sub_horz;
166 uint64_t chroma_sub_vert;
167 uint64_t cb_sub_horz;
168 uint64_t cb_sub_vert;
169 uint64_t chroma_siting_horz;
170 uint64_t chroma_siting_vert;
171 uint64_t range;
172 uint64_t transfer_characteristics;
173 uint64_t primaries;
174 uint64_t max_cll;
175 uint64_t max_fall;
176 MatroskaMasteringMeta mastering_meta;
177 } MatroskaTrackVideoColor;
178
179 typedef struct MatroskaTrackVideoProjection {
180 uint64_t type;
181 EbmlBin private;
182 double yaw;
183 double pitch;
184 double roll;
185 } MatroskaTrackVideoProjection;
186
187 typedef struct MatroskaTrackVideo {
188 double frame_rate;
189 uint64_t display_width;
190 uint64_t display_height;
191 uint64_t pixel_width;
192 uint64_t pixel_height;
193 EbmlBin color_space;
194 uint64_t display_unit;
195 uint64_t interlaced;
196 uint64_t field_order;
197 uint64_t stereo_mode;
198 uint64_t alpha_mode;
199 EbmlList color;
200 MatroskaTrackVideoProjection projection;
201 } MatroskaTrackVideo;
202
203 typedef struct MatroskaTrackAudio {
204 double samplerate;
205 double out_samplerate;
206 uint64_t bitdepth;
207 uint64_t channels;
208
209 /* real audio header (extracted from extradata) */
210 int coded_framesize;
211 int sub_packet_h;
212 int frame_size;
213 int sub_packet_size;
214 int sub_packet_cnt;
215 int pkt_cnt;
216 uint64_t buf_timecode;
217 uint8_t *buf;
218 } MatroskaTrackAudio;
219
220 typedef struct MatroskaTrackPlane {
221 uint64_t uid;
222 uint64_t type;
223 } MatroskaTrackPlane;
224
225 typedef struct MatroskaTrackOperation {
226 EbmlList combine_planes;
227 } MatroskaTrackOperation;
228
229 typedef struct MatroskaTrack {
230 uint64_t num;
231 uint64_t uid;
232 uint64_t type;
233 char *name;
234 char *codec_id;
235 EbmlBin codec_priv;
236 char *language;
237 double time_scale;
238 uint64_t default_duration;
239 uint64_t flag_default;
240 uint64_t flag_forced;
241 uint64_t seek_preroll;
242 MatroskaTrackVideo video;
243 MatroskaTrackAudio audio;
244 MatroskaTrackOperation operation;
245 EbmlList encodings;
246 uint64_t codec_delay;
247 uint64_t codec_delay_in_track_tb;
248
249 AVStream *stream;
250 int64_t end_timecode;
251 int ms_compat;
252 int needs_decoding;
253 uint64_t max_block_additional_id;
254
255 uint32_t palette[AVPALETTE_COUNT];
256 int has_palette;
257 } MatroskaTrack;
258
259 typedef struct MatroskaAttachment {
260 uint64_t uid;
261 char *filename;
262 char *description;
263 char *mime;
264 EbmlBin bin;
265
266 AVStream *stream;
267 } MatroskaAttachment;
268
269 typedef struct MatroskaChapter {
270 uint64_t start;
271 uint64_t end;
272 uint64_t uid;
273 char *title;
274
275 AVChapter *chapter;
276 } MatroskaChapter;
277
278 typedef struct MatroskaIndexPos {
279 uint64_t track;
280 uint64_t pos;
281 } MatroskaIndexPos;
282
283 typedef struct MatroskaIndex {
284 uint64_t time;
285 EbmlList pos;
286 } MatroskaIndex;
287
288 typedef struct MatroskaTag {
289 char *name;
290 char *string;
291 char *lang;
292 uint64_t def;
293 EbmlList sub;
294 } MatroskaTag;
295
296 typedef struct MatroskaTagTarget {
297 char *type;
298 uint64_t typevalue;
299 uint64_t trackuid;
300 uint64_t chapteruid;
301 uint64_t attachuid;
302 } MatroskaTagTarget;
303
304 typedef struct MatroskaTags {
305 MatroskaTagTarget target;
306 EbmlList tag;
307 } MatroskaTags;
308
309 typedef struct MatroskaSeekhead {
310 uint64_t id;
311 uint64_t pos;
312 } MatroskaSeekhead;
313
314 typedef struct MatroskaLevel {
315 uint64_t start;
316 uint64_t length;
317 } MatroskaLevel;
318
319 typedef struct MatroskaBlock {
320 uint64_t duration;
321 int64_t reference;
322 uint64_t non_simple;
323 EbmlBin bin;
324 uint64_t additional_id;
325 EbmlBin additional;
326 int64_t discard_padding;
327 } MatroskaBlock;
328
329 typedef struct MatroskaCluster {
330 MatroskaBlock block;
331 uint64_t timecode;
332 int64_t pos;
333 } MatroskaCluster;
334
335 typedef struct MatroskaLevel1Element {
336 int64_t pos;
337 uint32_t id;
338 int parsed;
339 } MatroskaLevel1Element;
340
341 typedef struct MatroskaDemuxContext {
342 const AVClass *class;
343 AVFormatContext *ctx;
344
345 /* EBML stuff */
346 MatroskaLevel levels[EBML_MAX_DEPTH];
347 int num_levels;
348 uint32_t current_id;
349 int64_t resync_pos;
350 int unknown_count;
351
352 uint64_t time_scale;
353 double duration;
354 char *title;
355 char *muxingapp;
356 EbmlBin date_utc;
357 EbmlList tracks;
358 EbmlList attachments;
359 EbmlList chapters;
360 EbmlList index;
361 EbmlList tags;
362 EbmlList seekhead;
363
364 /* byte position of the segment inside the stream */
365 int64_t segment_start;
366
367 /* the packet queue */
368 AVPacketList *queue;
369 AVPacketList *queue_end;
370
371 int done;
372
373 /* What to skip before effectively reading a packet. */
374 int skip_to_keyframe;
375 uint64_t skip_to_timecode;
376
377 /* File has a CUES element, but we defer parsing until it is needed. */
378 int cues_parsing_deferred;
379
380 /* Level1 elements and whether they were read yet */
381 MatroskaLevel1Element level1_elems[64];
382 int num_level1_elems;
383
384 MatroskaCluster current_cluster;
385
386 /* WebM DASH Manifest live flag */
387 int is_live;
388
389 /* Bandwidth value for WebM DASH Manifest */
390 int bandwidth;
391 } MatroskaDemuxContext;
392
393 #define CHILD_OF(parent) { .def = { .n = parent } }
394
395 // The following forward declarations need their size because
396 // a tentative definition with internal linkage must not be an
397 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
398 // Removing the sizes breaks MSVC.
399 static EbmlSyntax ebml_syntax[3], matroska_segment[9], matroska_track_video_color[15], matroska_track_video[19],
400 matroska_track[27], matroska_track_encoding[6], matroska_track_encodings[2],
401 matroska_track_combine_planes[2], matroska_track_operation[2], matroska_tracks[2],
402 matroska_attachments[2], matroska_chapter_entry[9], matroska_chapter[6], matroska_chapters[2],
403 matroska_index_entry[3], matroska_index[2], matroska_tag[3], matroska_tags[2], matroska_seekhead[2],
404 matroska_blockadditions[2], matroska_blockgroup[8], matroska_cluster_parsing[8];
405
406 static EbmlSyntax ebml_header[] = {
407 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
408 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
409 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
410 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
411 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
412 { EBML_ID_EBMLVERSION, EBML_NONE },
413 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
414 CHILD_OF(ebml_syntax)
415 };
416
417 static EbmlSyntax ebml_syntax[] = {
418 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
419 { MATROSKA_ID_SEGMENT, EBML_STOP },
420 { 0 }
421 };
422
423 static EbmlSyntax matroska_info[] = {
424 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
425 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
426 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
427 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
428 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
429 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
430 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
431 CHILD_OF(matroska_segment)
432 };
433
434 static EbmlSyntax matroska_mastering_meta[] = {
435 { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
436 { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
437 { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
438 { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
439 { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
440 { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
441 { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
442 { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
443 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
444 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
445 CHILD_OF(matroska_track_video_color)
446 };
447
448 static EbmlSyntax matroska_track_video_color[] = {
449 { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
450 { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=0 } },
451 { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
452 { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
453 { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
454 { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
455 { MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u = MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED } },
456 { MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u = MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED } },
457 { MATROSKA_ID_VIDEOCOLORRANGE, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, range), { .u = AVCOL_RANGE_UNSPECIFIED } },
458 { MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u = AVCOL_TRC_UNSPECIFIED } },
459 { MATROSKA_ID_VIDEOCOLORPRIMARIES, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u = AVCOL_PRI_UNSPECIFIED } },
460 { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
461 { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
462 { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
463 CHILD_OF(matroska_track_video)
464 };
465
466 static EbmlSyntax matroska_track_video_projection[] = {
467 { MATROSKA_ID_VIDEOPROJECTIONTYPE, EBML_UINT, 0, offsetof(MatroskaTrackVideoProjection, type), { .u = MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR } },
468 { MATROSKA_ID_VIDEOPROJECTIONPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrackVideoProjection, private) },
469 { MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f=0.0 } },
470 { MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f=0.0 } },
471 { MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f=0.0 } },
472 CHILD_OF(matroska_track_video)
473 };
474
475 static EbmlSyntax matroska_track_video[] = {
476 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
477 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
478 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
479 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
480 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
481 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
482 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
483 { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
484 { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
485 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
486 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
487 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
488 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
489 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
490 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
491 { MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
492 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
493 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
494 CHILD_OF(matroska_track)
495 };
496
497 static EbmlSyntax matroska_track_audio[] = {
498 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
499 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
500 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
501 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
502 CHILD_OF(matroska_track)
503 };
504
505 static EbmlSyntax matroska_track_encoding_compression[] = {
506 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
507 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
508 CHILD_OF(matroska_track_encoding)
509 };
510
511 static EbmlSyntax matroska_track_encoding_encryption[] = {
512 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
513 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
514 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
515 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
516 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
517 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
518 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
519 CHILD_OF(matroska_track_encoding)
520 };
521 static EbmlSyntax matroska_track_encoding[] = {
522 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
523 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
524 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
525 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
526 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
527 CHILD_OF(matroska_track_encodings)
528 };
529
530 static EbmlSyntax matroska_track_encodings[] = {
531 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
532 CHILD_OF(matroska_track)
533 };
534
535 static EbmlSyntax matroska_track_plane[] = {
536 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
537 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
538 CHILD_OF(matroska_track_combine_planes)
539 };
540
541 static EbmlSyntax matroska_track_combine_planes[] = {
542 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
543 CHILD_OF(matroska_track_operation)
544 };
545
546 static EbmlSyntax matroska_track_operation[] = {
547 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
548 CHILD_OF(matroska_track)
549 };
550
551 static EbmlSyntax matroska_track[] = {
552 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
553 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
554 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
555 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
556 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
557 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
558 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
559 { MATROSKA_ID_TRACKLANGUAGE, EBML_STR, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
560 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
561 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
562 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
563 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
564 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
565 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
566 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
567 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
568 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
569 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
570 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
571 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
572 { MATROSKA_ID_CODECNAME, EBML_NONE },
573 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
574 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
575 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
576 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
577 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
578 CHILD_OF(matroska_tracks)
579 };
580
581 static EbmlSyntax matroska_tracks[] = {
582 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
583 CHILD_OF(matroska_segment)
584 };
585
586 static EbmlSyntax matroska_attachment[] = {
587 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
588 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
589 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
590 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
591 { MATROSKA_ID_FILEDESC, EBML_UTF8, 0, offsetof(MatroskaAttachment, description) },
592 CHILD_OF(matroska_attachments)
593 };
594
595 static EbmlSyntax matroska_attachments[] = {
596 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
597 CHILD_OF(matroska_segment)
598 };
599
600 static EbmlSyntax matroska_chapter_display[] = {
601 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
602 { MATROSKA_ID_CHAPLANG, EBML_NONE },
603 { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
604 CHILD_OF(matroska_chapter_entry)
605 };
606
607 static EbmlSyntax matroska_chapter_entry[] = {
608 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
609 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
610 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
611 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
612 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
613 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
614 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
615 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
616 CHILD_OF(matroska_chapter)
617 };
618
619 static EbmlSyntax matroska_chapter[] = {
620 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
621 { MATROSKA_ID_EDITIONUID, EBML_NONE },
622 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
623 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
624 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
625 CHILD_OF(matroska_chapters)
626 };
627
628 static EbmlSyntax matroska_chapters[] = {
629 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
630 CHILD_OF(matroska_segment)
631 };
632
633 static EbmlSyntax matroska_index_pos[] = {
634 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
635 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
636 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
637 { MATROSKA_ID_CUEDURATION, EBML_NONE },
638 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
639 CHILD_OF(matroska_index_entry)
640 };
641
642 static EbmlSyntax matroska_index_entry[] = {
643 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
644 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
645 CHILD_OF(matroska_index)
646 };
647
648 static EbmlSyntax matroska_index[] = {
649 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
650 CHILD_OF(matroska_segment)
651 };
652
653 static EbmlSyntax matroska_simpletag[] = {
654 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
655 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
656 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
657 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
658 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
659 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
660 CHILD_OF(matroska_tag)
661 };
662
663 static EbmlSyntax matroska_tagtargets[] = {
664 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
665 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
666 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
667 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
668 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
669 CHILD_OF(matroska_tag)
670 };
671
672 static EbmlSyntax matroska_tag[] = {
673 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
674 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
675 CHILD_OF(matroska_tags)
676 };
677
678 static EbmlSyntax matroska_tags[] = {
679 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
680 CHILD_OF(matroska_segment)
681 };
682
683 static EbmlSyntax matroska_seekhead_entry[] = {
684 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
685 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
686 CHILD_OF(matroska_seekhead)
687 };
688
689 static EbmlSyntax matroska_seekhead[] = {
690 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
691 CHILD_OF(matroska_segment)
692 };
693
694 static EbmlSyntax matroska_segment[] = {
695 { MATROSKA_ID_CLUSTER, EBML_STOP },
696 { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
697 { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
698 { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
699 { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
700 { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
701 { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
702 { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
703 { 0 } /* We don't want to go back to level 0, so don't add the parent. */
704 };
705
706 static EbmlSyntax matroska_segments[] = {
707 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
708 { 0 }
709 };
710
711 static EbmlSyntax matroska_blockmore[] = {
712 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
713 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
714 CHILD_OF(matroska_blockadditions)
715 };
716
717 static EbmlSyntax matroska_blockadditions[] = {
718 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
719 CHILD_OF(matroska_blockgroup)
720 };
721
722 static EbmlSyntax matroska_blockgroup[] = {
723 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
724 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
725 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
726 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
727 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
728 { MATROSKA_ID_CODECSTATE, EBML_NONE },
729 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
730 CHILD_OF(matroska_cluster_parsing)
731 };
732
733 // The following array contains SimpleBlock and BlockGroup twice
734 // in order to reuse the other values for matroska_cluster_enter.
735 static EbmlSyntax matroska_cluster_parsing[] = {
736 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
737 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
738 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
739 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
740 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
741 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
742 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
743 CHILD_OF(matroska_segment)
744 };
745
746 static EbmlSyntax matroska_cluster_enter[] = {
747 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = &matroska_cluster_parsing[2] } },
748 { 0 }
749 };
750 #undef CHILD_OF
751
752 static const CodecMime mkv_image_mime_tags[] = {
753 {"image/gif" , AV_CODEC_ID_GIF},
754 {"image/jpeg" , AV_CODEC_ID_MJPEG},
755 {"image/png" , AV_CODEC_ID_PNG},
756 {"image/tiff" , AV_CODEC_ID_TIFF},
757
758 {"" , AV_CODEC_ID_NONE}
759 };
760
761 static const CodecMime mkv_mime_tags[] = {
762 {"text/plain" , AV_CODEC_ID_TEXT},
763 {"application/x-truetype-font", AV_CODEC_ID_TTF},
764 {"application/x-font" , AV_CODEC_ID_TTF},
765 {"application/vnd.ms-opentype", AV_CODEC_ID_OTF},
766 {"binary" , AV_CODEC_ID_BIN_DATA},
767
768 {"" , AV_CODEC_ID_NONE}
769 };
770
771 static const char *const matroska_doctypes[] = { "matroska", "webm" };
772
773 static int matroska_read_close(AVFormatContext *s);
774
775 /*
776 * This function prepares the status for parsing of level 1 elements.
777 */
matroska_reset_status(MatroskaDemuxContext * matroska,uint32_t id,int64_t position)778 static int matroska_reset_status(MatroskaDemuxContext *matroska,
779 uint32_t id, int64_t position)
780 {
781 if (position >= 0) {
782 int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
783 if (err < 0)
784 return err;
785 }
786
787 matroska->current_id = id;
788 matroska->num_levels = 1;
789 matroska->unknown_count = 0;
790 matroska->resync_pos = avio_tell(matroska->ctx->pb);
791 if (id)
792 matroska->resync_pos -= (av_log2(id) + 7) / 8;
793
794 return 0;
795 }
796
matroska_resync(MatroskaDemuxContext * matroska,int64_t last_pos)797 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
798 {
799 AVIOContext *pb = matroska->ctx->pb;
800 uint32_t id;
801
802 /* Try to seek to the last position to resync from. If this doesn't work,
803 * we resync from the earliest position available: The start of the buffer. */
804 if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
805 av_log(matroska->ctx, AV_LOG_WARNING,
806 "Seek to desired resync point failed. Seeking to "
807 "earliest point available instead.\n");
808 avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
809 last_pos + 1), SEEK_SET);
810 }
811
812 id = avio_rb32(pb);
813
814 // try to find a toplevel element
815 while (!avio_feof(pb)) {
816 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
817 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
818 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
819 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
820 /* Prepare the context for parsing of a level 1 element. */
821 matroska_reset_status(matroska, id, -1);
822 /* Given that we are here means that an error has occurred,
823 * so treat the segment as unknown length in order not to
824 * discard valid data that happens to be beyond the designated
825 * end of the segment. */
826 matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
827 return 0;
828 }
829 id = (id << 8) | avio_r8(pb);
830 }
831
832 matroska->done = 1;
833 return pb->error ? pb->error : AVERROR_EOF;
834 }
835
836 /*
837 * Read: an "EBML number", which is defined as a variable-length
838 * array of bytes. The first byte indicates the length by giving a
839 * number of 0-bits followed by a one. The position of the first
840 * "one" bit inside the first byte indicates the length of this
841 * number.
842 * Returns: number of bytes read, < 0 on error
843 */
ebml_read_num(MatroskaDemuxContext * matroska,AVIOContext * pb,int max_size,uint64_t * number,int eof_forbidden)844 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
845 int max_size, uint64_t *number, int eof_forbidden)
846 {
847 int read, n = 1;
848 uint64_t total;
849 int64_t pos;
850
851 /* The first byte tells us the length in bytes - except when it is zero. */
852 total = avio_r8(pb);
853 if (pb->eof_reached)
854 goto err;
855
856 /* get the length of the EBML number */
857 read = 8 - ff_log2_tab[total];
858
859 if (!total || read > max_size) {
860 pos = avio_tell(pb) - 1;
861 if (!total) {
862 av_log(matroska->ctx, AV_LOG_ERROR,
863 "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
864 "of an EBML number\n", pos, pos);
865 } else {
866 av_log(matroska->ctx, AV_LOG_ERROR,
867 "Length %d indicated by an EBML number's first byte 0x%02x "
868 "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
869 read, (uint8_t) total, pos, pos, max_size);
870 }
871 return AVERROR_INVALIDDATA;
872 }
873
874 /* read out length */
875 total ^= 1 << ff_log2_tab[total];
876 while (n++ < read)
877 total = (total << 8) | avio_r8(pb);
878
879 if (pb->eof_reached) {
880 eof_forbidden = 1;
881 goto err;
882 }
883
884 *number = total;
885
886 return read;
887
888 err:
889 pos = avio_tell(pb);
890 if (pb->error) {
891 av_log(matroska->ctx, AV_LOG_ERROR,
892 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
893 pos, pos);
894 return pb->error;
895 }
896 if (eof_forbidden) {
897 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
898 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
899 return AVERROR(EIO);
900 }
901 return AVERROR_EOF;
902 }
903
904 /**
905 * Read a EBML length value.
906 * This needs special handling for the "unknown length" case which has multiple
907 * encodings.
908 */
ebml_read_length(MatroskaDemuxContext * matroska,AVIOContext * pb,uint64_t * number)909 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
910 uint64_t *number)
911 {
912 int res = ebml_read_num(matroska, pb, 8, number, 1);
913 if (res > 0 && *number + 1 == 1ULL << (7 * res))
914 *number = EBML_UNKNOWN_LENGTH;
915 return res;
916 }
917
918 /*
919 * Read the next element as an unsigned int.
920 * Returns NEEDS_CHECKING.
921 */
ebml_read_uint(AVIOContext * pb,int size,uint64_t * num)922 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
923 {
924 int n = 0;
925
926 /* big-endian ordering; build up number */
927 *num = 0;
928 while (n++ < size)
929 *num = (*num << 8) | avio_r8(pb);
930
931 return NEEDS_CHECKING;
932 }
933
934 /*
935 * Read the next element as a signed int.
936 * Returns NEEDS_CHECKING.
937 */
ebml_read_sint(AVIOContext * pb,int size,int64_t * num)938 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
939 {
940 int n = 1;
941
942 if (size == 0) {
943 *num = 0;
944 } else {
945 *num = sign_extend(avio_r8(pb), 8);
946
947 /* big-endian ordering; build up number */
948 while (n++ < size)
949 *num = ((uint64_t)*num << 8) | avio_r8(pb);
950 }
951
952 return NEEDS_CHECKING;
953 }
954
955 /*
956 * Read the next element as a float.
957 * Returns NEEDS_CHECKING or < 0 on obvious failure.
958 */
ebml_read_float(AVIOContext * pb,int size,double * num)959 static int ebml_read_float(AVIOContext *pb, int size, double *num)
960 {
961 if (size == 0)
962 *num = 0;
963 else if (size == 4)
964 *num = av_int2float(avio_rb32(pb));
965 else if (size == 8)
966 *num = av_int2double(avio_rb64(pb));
967 else
968 return AVERROR_INVALIDDATA;
969
970 return NEEDS_CHECKING;
971 }
972
973 /*
974 * Read the next element as an ASCII string.
975 * 0 is success, < 0 or NEEDS_CHECKING is failure.
976 */
ebml_read_ascii(AVIOContext * pb,int size,char ** str)977 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
978 {
979 char *res;
980 int ret;
981
982 /* EBML strings are usually not 0-terminated, so we allocate one
983 * byte more, read the string and NULL-terminate it ourselves. */
984 if (!(res = av_malloc(size + 1)))
985 return AVERROR(ENOMEM);
986 if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
987 av_free(res);
988 return ret < 0 ? ret : NEEDS_CHECKING;
989 }
990 (res)[size] = '\0';
991 av_free(*str);
992 *str = res;
993
994 return 0;
995 }
996
997 /*
998 * Read the next element as binary data.
999 * 0 is success, < 0 or NEEDS_CHECKING is failure.
1000 */
ebml_read_binary(AVIOContext * pb,int length,int64_t pos,EbmlBin * bin)1001 static int ebml_read_binary(AVIOContext *pb, int length,
1002 int64_t pos, EbmlBin *bin)
1003 {
1004 int ret;
1005
1006 ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
1007 if (ret < 0)
1008 return ret;
1009 memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1010
1011 bin->data = bin->buf->data;
1012 bin->size = length;
1013 bin->pos = pos;
1014 if ((ret = avio_read(pb, bin->data, length)) != length) {
1015 av_buffer_unref(&bin->buf);
1016 bin->data = NULL;
1017 bin->size = 0;
1018 return ret < 0 ? ret : NEEDS_CHECKING;
1019 }
1020
1021 return 0;
1022 }
1023
1024 /*
1025 * Read the next element, but only the header. The contents
1026 * are supposed to be sub-elements which can be read separately.
1027 * 0 is success, < 0 is failure.
1028 */
ebml_read_master(MatroskaDemuxContext * matroska,uint64_t length,int64_t pos)1029 static int ebml_read_master(MatroskaDemuxContext *matroska,
1030 uint64_t length, int64_t pos)
1031 {
1032 MatroskaLevel *level;
1033
1034 if (matroska->num_levels >= EBML_MAX_DEPTH) {
1035 av_log(matroska->ctx, AV_LOG_ERROR,
1036 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1037 return AVERROR(ENOSYS);
1038 }
1039
1040 level = &matroska->levels[matroska->num_levels++];
1041 level->start = pos;
1042 level->length = length;
1043
1044 return 0;
1045 }
1046
1047 /*
1048 * Read a signed "EBML number"
1049 * Return: number of bytes processed, < 0 on error
1050 */
matroska_ebmlnum_sint(MatroskaDemuxContext * matroska,AVIOContext * pb,int64_t * num)1051 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
1052 AVIOContext *pb, int64_t *num)
1053 {
1054 uint64_t unum;
1055 int res;
1056
1057 /* read as unsigned number first */
1058 if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1059 return res;
1060
1061 /* make signed (weird way) */
1062 *num = unum - ((1LL << (7 * res - 1)) - 1);
1063
1064 return res;
1065 }
1066
1067 static int ebml_parse(MatroskaDemuxContext *matroska,
1068 EbmlSyntax *syntax, void *data);
1069
ebml_parse_id(EbmlSyntax * syntax,uint32_t id)1070 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1071 {
1072 int i;
1073
1074 // Whoever touches this should be aware of the duplication
1075 // existing in matroska_cluster_parsing.
1076 for (i = 0; syntax[i].id; i++)
1077 if (id == syntax[i].id)
1078 break;
1079
1080 return &syntax[i];
1081 }
1082
ebml_parse_nest(MatroskaDemuxContext * matroska,EbmlSyntax * syntax,void * data)1083 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1084 void *data)
1085 {
1086 int res;
1087
1088 if (data) {
1089 for (int i = 0; syntax[i].id; i++)
1090 switch (syntax[i].type) {
1091 case EBML_UINT:
1092 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1093 break;
1094 case EBML_SINT:
1095 *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1096 break;
1097 case EBML_FLOAT:
1098 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1099 break;
1100 case EBML_STR:
1101 case EBML_UTF8:
1102 // the default may be NULL
1103 if (syntax[i].def.s) {
1104 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1105 *dst = av_strdup(syntax[i].def.s);
1106 if (!*dst)
1107 return AVERROR(ENOMEM);
1108 }
1109 break;
1110 }
1111
1112 if (!matroska->levels[matroska->num_levels - 1].length) {
1113 matroska->num_levels--;
1114 return 0;
1115 }
1116 }
1117
1118 do {
1119 res = ebml_parse(matroska, syntax, data);
1120 } while (!res);
1121
1122 return res == LEVEL_ENDED ? 0 : res;
1123 }
1124
is_ebml_id_valid(uint32_t id)1125 static int is_ebml_id_valid(uint32_t id)
1126 {
1127 // Due to endian nonsense in Matroska, the highest byte with any bits set
1128 // will contain the leading length bit. This bit in turn identifies the
1129 // total byte length of the element by its position within the byte.
1130 unsigned int bits = av_log2(id);
1131 return id && (bits + 7) / 8 == (8 - bits % 8);
1132 }
1133
1134 /*
1135 * Allocate and return the entry for the level1 element with the given ID. If
1136 * an entry already exists, return the existing entry.
1137 */
matroska_find_level1_elem(MatroskaDemuxContext * matroska,uint32_t id,int64_t pos)1138 static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
1139 uint32_t id, int64_t pos)
1140 {
1141 int i;
1142 MatroskaLevel1Element *elem;
1143
1144 if (!is_ebml_id_valid(id))
1145 return NULL;
1146
1147 // Some files link to all clusters; useless.
1148 if (id == MATROSKA_ID_CLUSTER)
1149 return NULL;
1150
1151 // There can be multiple SeekHeads and Tags.
1152 for (i = 0; i < matroska->num_level1_elems; i++) {
1153 if (matroska->level1_elems[i].id == id) {
1154 if (matroska->level1_elems[i].pos == pos ||
1155 id != MATROSKA_ID_SEEKHEAD && id != MATROSKA_ID_TAGS)
1156 return &matroska->level1_elems[i];
1157 }
1158 }
1159
1160 // Only a completely broken file would have more elements.
1161 if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1162 av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements.\n");
1163 return NULL;
1164 }
1165
1166 elem = &matroska->level1_elems[matroska->num_level1_elems++];
1167 *elem = (MatroskaLevel1Element){.id = id};
1168
1169 return elem;
1170 }
1171
ebml_parse(MatroskaDemuxContext * matroska,EbmlSyntax * syntax,void * data)1172 static int ebml_parse(MatroskaDemuxContext *matroska,
1173 EbmlSyntax *syntax, void *data)
1174 {
1175 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1176 // Forbid unknown-length EBML_NONE elements.
1177 [EBML_NONE] = EBML_UNKNOWN_LENGTH - 1,
1178 [EBML_UINT] = 8,
1179 [EBML_SINT] = 8,
1180 [EBML_FLOAT] = 8,
1181 // max. 16 MB for strings
1182 [EBML_STR] = 0x1000000,
1183 [EBML_UTF8] = 0x1000000,
1184 // max. 256 MB for binary data
1185 [EBML_BIN] = 0x10000000,
1186 // no limits for anything else
1187 };
1188 AVIOContext *pb = matroska->ctx->pb;
1189 uint32_t id;
1190 uint64_t length;
1191 int64_t pos = avio_tell(pb), pos_alt;
1192 int res, update_pos = 1, level_check;
1193 MatroskaLevel1Element *level1_elem;
1194 MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1195
1196 if (!matroska->current_id) {
1197 uint64_t id;
1198 res = ebml_read_num(matroska, pb, 4, &id, 0);
1199 if (res < 0) {
1200 if (pb->eof_reached && res == AVERROR_EOF) {
1201 if (matroska->is_live)
1202 // in live mode, finish parsing if EOF is reached.
1203 return 1;
1204 if (level && pos == avio_tell(pb)) {
1205 if (level->length == EBML_UNKNOWN_LENGTH) {
1206 // Unknown-length levels automatically end at EOF.
1207 matroska->num_levels--;
1208 return LEVEL_ENDED;
1209 } else {
1210 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1211 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1212 }
1213 }
1214 }
1215 return res;
1216 }
1217 matroska->current_id = id | 1 << 7 * res;
1218 pos_alt = pos + res;
1219 } else {
1220 pos_alt = pos;
1221 pos -= (av_log2(matroska->current_id) + 7) / 8;
1222 }
1223
1224 id = matroska->current_id;
1225
1226 syntax = ebml_parse_id(syntax, id);
1227 if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1228 if (level && level->length == EBML_UNKNOWN_LENGTH) {
1229 // Unknown-length levels end when an element from an upper level
1230 // in the hierarchy is encountered.
1231 while (syntax->def.n) {
1232 syntax = ebml_parse_id(syntax->def.n, id);
1233 if (syntax->id) {
1234 matroska->num_levels--;
1235 return LEVEL_ENDED;
1236 }
1237 };
1238 }
1239
1240 av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1241 "%"PRId64"\n", id, pos);
1242 update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1243 }
1244
1245 if (data) {
1246 data = (char *) data + syntax->data_offset;
1247 if (syntax->list_elem_size) {
1248 EbmlList *list = data;
1249 void *newelem;
1250
1251 if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1252 return AVERROR(ENOMEM);
1253 newelem = av_fast_realloc(list->elem,
1254 &list->alloc_elem_size,
1255 (list->nb_elem + 1) * syntax->list_elem_size);
1256 if (!newelem)
1257 return AVERROR(ENOMEM);
1258 list->elem = newelem;
1259 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1260 memset(data, 0, syntax->list_elem_size);
1261 list->nb_elem++;
1262 }
1263 }
1264
1265 if (syntax->type != EBML_STOP) {
1266 matroska->current_id = 0;
1267 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1268 return res;
1269
1270 pos_alt += res;
1271
1272 if (matroska->num_levels > 0) {
1273 if (length != EBML_UNKNOWN_LENGTH &&
1274 level->length != EBML_UNKNOWN_LENGTH) {
1275 uint64_t elem_end = pos_alt + length,
1276 level_end = level->start + level->length;
1277
1278 if (elem_end < level_end) {
1279 level_check = 0;
1280 } else if (elem_end == level_end) {
1281 level_check = LEVEL_ENDED;
1282 } else {
1283 av_log(matroska->ctx, AV_LOG_ERROR,
1284 "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1285 "containing master element ending at 0x%"PRIx64"\n",
1286 pos, elem_end, level_end);
1287 return AVERROR_INVALIDDATA;
1288 }
1289 } else if (length != EBML_UNKNOWN_LENGTH) {
1290 level_check = 0;
1291 } else if (level->length != EBML_UNKNOWN_LENGTH) {
1292 av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1293 "at 0x%"PRIx64" inside parent with finite size\n", pos);
1294 return AVERROR_INVALIDDATA;
1295 } else {
1296 level_check = 0;
1297 if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1298 || syntax->type == EBML_NEST)) {
1299 // According to the current specifications only clusters and
1300 // segments are allowed to be unknown-length. We also accept
1301 // other unknown-length master elements.
1302 av_log(matroska->ctx, AV_LOG_WARNING,
1303 "Found unknown-length element 0x%"PRIX32" other than "
1304 "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1305 "parsing will nevertheless be attempted.\n", id, pos);
1306 update_pos = -1;
1307 }
1308 }
1309 } else
1310 level_check = 0;
1311
1312 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1313 if (length != EBML_UNKNOWN_LENGTH) {
1314 av_log(matroska->ctx, AV_LOG_ERROR,
1315 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1316 "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1317 length, max_lengths[syntax->type], id, pos);
1318 } else if (syntax->type != EBML_NONE) {
1319 av_log(matroska->ctx, AV_LOG_ERROR,
1320 "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1321 "unknown length, yet the length of an element of its "
1322 "type must be known.\n", id, pos);
1323 } else {
1324 av_log(matroska->ctx, AV_LOG_ERROR,
1325 "Found unknown-length element with ID 0x%"PRIX32" at "
1326 "pos. 0x%"PRIx64" for which no syntax for parsing is "
1327 "available.\n", id, pos);
1328 }
1329 return AVERROR_INVALIDDATA;
1330 }
1331
1332 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1333 // Loosing sync will likely manifest itself as encountering unknown
1334 // elements which are not reliably distinguishable from elements
1335 // belonging to future extensions of the format.
1336 // We use a heuristic to detect such situations: If the current
1337 // element is not expected at the current syntax level and there
1338 // were only a few unknown elements in a row, then the element is
1339 // skipped or considered defective based upon the length of the
1340 // current element (i.e. how much would be skipped); if there were
1341 // more than a few skipped elements in a row and skipping the current
1342 // element would lead us more than SKIP_THRESHOLD away from the last
1343 // known good position, then it is inferred that an error occurred.
1344 // The dependency on the number of unknown elements in a row exists
1345 // because the distance to the last known good position is
1346 // automatically big if the last parsed element was big.
1347 // In both cases, each unknown element is considered equivalent to
1348 // UNKNOWN_EQUIV of skipped bytes for the check.
1349 // The whole check is only done for non-seekable output, because
1350 // in this situation skipped data can't simply be rechecked later.
1351 // This is especially important when using unkown length elements
1352 // as the check for whether a child exceeds its containing master
1353 // element is not effective in this situation.
1354 if (update_pos) {
1355 matroska->unknown_count = 0;
1356 } else {
1357 int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1358
1359 if (matroska->unknown_count > 3)
1360 dist += pos_alt - matroska->resync_pos;
1361
1362 if (dist > SKIP_THRESHOLD) {
1363 av_log(matroska->ctx, AV_LOG_ERROR,
1364 "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1365 "length 0x%"PRIx64" considered as invalid data. Last "
1366 "known good position 0x%"PRIx64", %d unknown elements"
1367 " in a row\n", id, pos, length, matroska->resync_pos,
1368 matroska->unknown_count);
1369 return AVERROR_INVALIDDATA;
1370 }
1371 }
1372 }
1373
1374 if (update_pos > 0) {
1375 // We have found an element that is allowed at this place
1376 // in the hierarchy and it passed all checks, so treat the beginning
1377 // of the element as the "last known good" position.
1378 matroska->resync_pos = pos;
1379 }
1380
1381 if (!data && length != EBML_UNKNOWN_LENGTH)
1382 goto skip;
1383 }
1384
1385 switch (syntax->type) {
1386 case EBML_UINT:
1387 res = ebml_read_uint(pb, length, data);
1388 break;
1389 case EBML_SINT:
1390 res = ebml_read_sint(pb, length, data);
1391 break;
1392 case EBML_FLOAT:
1393 res = ebml_read_float(pb, length, data);
1394 break;
1395 case EBML_STR:
1396 case EBML_UTF8:
1397 res = ebml_read_ascii(pb, length, data);
1398 break;
1399 case EBML_BIN:
1400 res = ebml_read_binary(pb, length, pos_alt, data);
1401 break;
1402 case EBML_LEVEL1:
1403 case EBML_NEST:
1404 if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1405 return res;
1406 if (id == MATROSKA_ID_SEGMENT)
1407 matroska->segment_start = pos_alt;
1408 if (id == MATROSKA_ID_CUES)
1409 matroska->cues_parsing_deferred = 0;
1410 if (syntax->type == EBML_LEVEL1 &&
1411 (level1_elem = matroska_find_level1_elem(matroska, syntax->id, pos))) {
1412 if (!level1_elem->pos) {
1413 // Zero is not a valid position for a level 1 element.
1414 level1_elem->pos = pos;
1415 } else if (level1_elem->pos != pos)
1416 av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1417 level1_elem->parsed = 1;
1418 }
1419 if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1420 return res;
1421 break;
1422 case EBML_STOP:
1423 return 1;
1424 skip:
1425 default:
1426 if (length) {
1427 int64_t res2;
1428 if (ffio_limit(pb, length) != length) {
1429 // ffio_limit emits its own error message,
1430 // so we don't have to.
1431 return AVERROR(EIO);
1432 }
1433 if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1434 // avio_skip might take us past EOF. We check for this
1435 // by skipping only length - 1 bytes, reading a byte and
1436 // checking the error flags. This is done in order to check
1437 // that the element has been properly skipped even when
1438 // no filesize (that ffio_limit relies on) is available.
1439 avio_r8(pb);
1440 res = NEEDS_CHECKING;
1441 } else
1442 res = res2;
1443 } else
1444 res = 0;
1445 }
1446 if (res) {
1447 if (res == NEEDS_CHECKING) {
1448 if (pb->eof_reached) {
1449 if (pb->error)
1450 res = pb->error;
1451 else
1452 res = AVERROR_EOF;
1453 } else
1454 goto level_check;
1455 }
1456
1457 if (res == AVERROR_INVALIDDATA)
1458 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1459 else if (res == AVERROR(EIO))
1460 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1461 else if (res == AVERROR_EOF) {
1462 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1463 res = AVERROR(EIO);
1464 }
1465
1466 return res;
1467 }
1468
1469 level_check:
1470 if (level_check == LEVEL_ENDED && matroska->num_levels) {
1471 level = &matroska->levels[matroska->num_levels - 1];
1472 pos = avio_tell(pb);
1473
1474 // Given that pos >= level->start no check for
1475 // level->length != EBML_UNKNOWN_LENGTH is necessary.
1476 while (matroska->num_levels && pos == level->start + level->length) {
1477 matroska->num_levels--;
1478 level--;
1479 }
1480 }
1481
1482 return level_check;
1483 }
1484
ebml_free(EbmlSyntax * syntax,void * data)1485 static void ebml_free(EbmlSyntax *syntax, void *data)
1486 {
1487 int i, j;
1488 for (i = 0; syntax[i].id; i++) {
1489 void *data_off = (char *) data + syntax[i].data_offset;
1490 switch (syntax[i].type) {
1491 case EBML_STR:
1492 case EBML_UTF8:
1493 av_freep(data_off);
1494 break;
1495 case EBML_BIN:
1496 av_buffer_unref(&((EbmlBin *) data_off)->buf);
1497 break;
1498 case EBML_LEVEL1:
1499 case EBML_NEST:
1500 if (syntax[i].list_elem_size) {
1501 EbmlList *list = data_off;
1502 char *ptr = list->elem;
1503 for (j = 0; j < list->nb_elem;
1504 j++, ptr += syntax[i].list_elem_size)
1505 ebml_free(syntax[i].def.n, ptr);
1506 av_freep(&list->elem);
1507 list->nb_elem = 0;
1508 list->alloc_elem_size = 0;
1509 } else
1510 ebml_free(syntax[i].def.n, data_off);
1511 default:
1512 break;
1513 }
1514 }
1515 }
1516
1517 /*
1518 * Autodetecting...
1519 */
matroska_probe(const AVProbeData * p)1520 static int matroska_probe(const AVProbeData *p)
1521 {
1522 uint64_t total = 0;
1523 int len_mask = 0x80, size = 1, n = 1, i;
1524
1525 /* EBML header? */
1526 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1527 return 0;
1528
1529 /* length of header */
1530 total = p->buf[4];
1531 while (size <= 8 && !(total & len_mask)) {
1532 size++;
1533 len_mask >>= 1;
1534 }
1535 if (size > 8)
1536 return 0;
1537 total &= (len_mask - 1);
1538 while (n < size)
1539 total = (total << 8) | p->buf[4 + n++];
1540
1541 if (total + 1 == 1ULL << (7 * size)){
1542 /* Unknown-length header - simply parse the whole buffer. */
1543 total = p->buf_size - 4 - size;
1544 } else {
1545 /* Does the probe data contain the whole header? */
1546 if (p->buf_size < 4 + size + total)
1547 return 0;
1548 }
1549
1550 /* The header should contain a known document type. For now,
1551 * we don't parse the whole header but simply check for the
1552 * availability of that array of characters inside the header.
1553 * Not fully fool-proof, but good enough. */
1554 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1555 size_t probelen = strlen(matroska_doctypes[i]);
1556 if (total < probelen)
1557 continue;
1558 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1559 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1560 return AVPROBE_SCORE_MAX;
1561 }
1562
1563 // probably valid EBML header but no recognized doctype
1564 return AVPROBE_SCORE_EXTENSION;
1565 }
1566
matroska_find_track_by_num(MatroskaDemuxContext * matroska,uint64_t num)1567 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1568 uint64_t num)
1569 {
1570 MatroskaTrack *tracks = matroska->tracks.elem;
1571 int i;
1572
1573 for (i = 0; i < matroska->tracks.nb_elem; i++)
1574 if (tracks[i].num == num)
1575 return &tracks[i];
1576
1577 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %"PRIu64"\n", num);
1578 return NULL;
1579 }
1580
matroska_decode_buffer(uint8_t ** buf,int * buf_size,MatroskaTrack * track)1581 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1582 MatroskaTrack *track)
1583 {
1584 MatroskaTrackEncoding *encodings = track->encodings.elem;
1585 uint8_t *data = *buf;
1586 int isize = *buf_size;
1587 uint8_t *pkt_data = NULL;
1588 uint8_t av_unused *newpktdata;
1589 int pkt_size = isize;
1590 int result = 0;
1591 int olen;
1592
1593 if (pkt_size >= 10000000U)
1594 return AVERROR_INVALIDDATA;
1595
1596 switch (encodings[0].compression.algo) {
1597 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1598 {
1599 int header_size = encodings[0].compression.settings.size;
1600 uint8_t *header = encodings[0].compression.settings.data;
1601
1602 if (header_size && !header) {
1603 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1604 return -1;
1605 }
1606
1607 if (!header_size)
1608 return 0;
1609
1610 pkt_size = isize + header_size;
1611 pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1612 if (!pkt_data)
1613 return AVERROR(ENOMEM);
1614
1615 memcpy(pkt_data, header, header_size);
1616 memcpy(pkt_data + header_size, data, isize);
1617 break;
1618 }
1619 #if CONFIG_LZO
1620 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1621 do {
1622 int insize = isize;
1623 olen = pkt_size *= 3;
1624 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1625 + AV_INPUT_BUFFER_PADDING_SIZE);
1626 if (!newpktdata) {
1627 result = AVERROR(ENOMEM);
1628 goto failed;
1629 }
1630 pkt_data = newpktdata;
1631 result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1632 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1633 if (result) {
1634 result = AVERROR_INVALIDDATA;
1635 goto failed;
1636 }
1637 pkt_size -= olen;
1638 break;
1639 #endif
1640 #if CONFIG_ZLIB
1641 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1642 {
1643 z_stream zstream = { 0 };
1644 if (inflateInit(&zstream) != Z_OK)
1645 return -1;
1646 zstream.next_in = data;
1647 zstream.avail_in = isize;
1648 do {
1649 pkt_size *= 3;
1650 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1651 if (!newpktdata) {
1652 inflateEnd(&zstream);
1653 result = AVERROR(ENOMEM);
1654 goto failed;
1655 }
1656 pkt_data = newpktdata;
1657 zstream.avail_out = pkt_size - zstream.total_out;
1658 zstream.next_out = pkt_data + zstream.total_out;
1659 result = inflate(&zstream, Z_NO_FLUSH);
1660 } while (result == Z_OK && pkt_size < 10000000);
1661 pkt_size = zstream.total_out;
1662 inflateEnd(&zstream);
1663 if (result != Z_STREAM_END) {
1664 if (result == Z_MEM_ERROR)
1665 result = AVERROR(ENOMEM);
1666 else
1667 result = AVERROR_INVALIDDATA;
1668 goto failed;
1669 }
1670 break;
1671 }
1672 #endif
1673 #if CONFIG_BZLIB
1674 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1675 {
1676 bz_stream bzstream = { 0 };
1677 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1678 return -1;
1679 bzstream.next_in = data;
1680 bzstream.avail_in = isize;
1681 do {
1682 pkt_size *= 3;
1683 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1684 if (!newpktdata) {
1685 BZ2_bzDecompressEnd(&bzstream);
1686 result = AVERROR(ENOMEM);
1687 goto failed;
1688 }
1689 pkt_data = newpktdata;
1690 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1691 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1692 result = BZ2_bzDecompress(&bzstream);
1693 } while (result == BZ_OK && pkt_size < 10000000);
1694 pkt_size = bzstream.total_out_lo32;
1695 BZ2_bzDecompressEnd(&bzstream);
1696 if (result != BZ_STREAM_END) {
1697 if (result == BZ_MEM_ERROR)
1698 result = AVERROR(ENOMEM);
1699 else
1700 result = AVERROR_INVALIDDATA;
1701 goto failed;
1702 }
1703 break;
1704 }
1705 #endif
1706 default:
1707 return AVERROR_INVALIDDATA;
1708 }
1709
1710 memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1711
1712 *buf = pkt_data;
1713 *buf_size = pkt_size;
1714 return 0;
1715
1716 failed:
1717 av_free(pkt_data);
1718 return result;
1719 }
1720
matroska_convert_tag(AVFormatContext * s,EbmlList * list,AVDictionary ** metadata,char * prefix)1721 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1722 AVDictionary **metadata, char *prefix)
1723 {
1724 MatroskaTag *tags = list->elem;
1725 char key[1024];
1726 int i;
1727
1728 for (i = 0; i < list->nb_elem; i++) {
1729 const char *lang = tags[i].lang &&
1730 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1731
1732 if (!tags[i].name) {
1733 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1734 continue;
1735 }
1736 if (prefix)
1737 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1738 else
1739 av_strlcpy(key, tags[i].name, sizeof(key));
1740 if (tags[i].def || !lang) {
1741 av_dict_set(metadata, key, tags[i].string, 0);
1742 if (tags[i].sub.nb_elem)
1743 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1744 }
1745 if (lang) {
1746 av_strlcat(key, "-", sizeof(key));
1747 av_strlcat(key, lang, sizeof(key));
1748 av_dict_set(metadata, key, tags[i].string, 0);
1749 if (tags[i].sub.nb_elem)
1750 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1751 }
1752 }
1753 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1754 }
1755
matroska_convert_tags(AVFormatContext * s)1756 static void matroska_convert_tags(AVFormatContext *s)
1757 {
1758 MatroskaDemuxContext *matroska = s->priv_data;
1759 MatroskaTags *tags = matroska->tags.elem;
1760 int i, j;
1761
1762 for (i = 0; i < matroska->tags.nb_elem; i++) {
1763 if (tags[i].target.attachuid) {
1764 MatroskaAttachment *attachment = matroska->attachments.elem;
1765 int found = 0;
1766 for (j = 0; j < matroska->attachments.nb_elem; j++) {
1767 if (attachment[j].uid == tags[i].target.attachuid &&
1768 attachment[j].stream) {
1769 matroska_convert_tag(s, &tags[i].tag,
1770 &attachment[j].stream->metadata, NULL);
1771 found = 1;
1772 }
1773 }
1774 if (!found) {
1775 av_log(s, AV_LOG_WARNING,
1776 "The tags at index %d refer to a "
1777 "non-existent attachment %"PRId64".\n",
1778 i, tags[i].target.attachuid);
1779 }
1780 } else if (tags[i].target.chapteruid) {
1781 MatroskaChapter *chapter = matroska->chapters.elem;
1782 int found = 0;
1783 for (j = 0; j < matroska->chapters.nb_elem; j++) {
1784 if (chapter[j].uid == tags[i].target.chapteruid &&
1785 chapter[j].chapter) {
1786 matroska_convert_tag(s, &tags[i].tag,
1787 &chapter[j].chapter->metadata, NULL);
1788 found = 1;
1789 }
1790 }
1791 if (!found) {
1792 av_log(s, AV_LOG_WARNING,
1793 "The tags at index %d refer to a non-existent chapter "
1794 "%"PRId64".\n",
1795 i, tags[i].target.chapteruid);
1796 }
1797 } else if (tags[i].target.trackuid) {
1798 MatroskaTrack *track = matroska->tracks.elem;
1799 int found = 0;
1800 for (j = 0; j < matroska->tracks.nb_elem; j++) {
1801 if (track[j].uid == tags[i].target.trackuid &&
1802 track[j].stream) {
1803 matroska_convert_tag(s, &tags[i].tag,
1804 &track[j].stream->metadata, NULL);
1805 found = 1;
1806 }
1807 }
1808 if (!found) {
1809 av_log(s, AV_LOG_WARNING,
1810 "The tags at index %d refer to a non-existent track "
1811 "%"PRId64".\n",
1812 i, tags[i].target.trackuid);
1813 }
1814 } else {
1815 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1816 tags[i].target.type);
1817 }
1818 }
1819 }
1820
matroska_parse_seekhead_entry(MatroskaDemuxContext * matroska,int64_t pos)1821 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1822 int64_t pos)
1823 {
1824 uint32_t saved_id = matroska->current_id;
1825 int64_t before_pos = avio_tell(matroska->ctx->pb);
1826 int ret = 0;
1827
1828 /* seek */
1829 if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1830 /* We don't want to lose our seekhead level, so we add
1831 * a dummy. This is a crude hack. */
1832 if (matroska->num_levels == EBML_MAX_DEPTH) {
1833 av_log(matroska->ctx, AV_LOG_INFO,
1834 "Max EBML element depth (%d) reached, "
1835 "cannot parse further.\n", EBML_MAX_DEPTH);
1836 ret = AVERROR_INVALIDDATA;
1837 } else {
1838 matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1839 matroska->num_levels++;
1840 matroska->current_id = 0;
1841
1842 ret = ebml_parse(matroska, matroska_segment, matroska);
1843 if (ret == LEVEL_ENDED) {
1844 /* This can only happen if the seek brought us beyond EOF. */
1845 ret = AVERROR_EOF;
1846 }
1847 }
1848 }
1849 /* Seek back - notice that in all instances where this is used
1850 * it is safe to set the level to 1. */
1851 matroska_reset_status(matroska, saved_id, before_pos);
1852
1853 return ret;
1854 }
1855
matroska_execute_seekhead(MatroskaDemuxContext * matroska)1856 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1857 {
1858 EbmlList *seekhead_list = &matroska->seekhead;
1859 int i;
1860
1861 // we should not do any seeking in the streaming case
1862 if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1863 return;
1864
1865 for (i = 0; i < seekhead_list->nb_elem; i++) {
1866 MatroskaSeekhead *seekheads = seekhead_list->elem;
1867 uint32_t id = seekheads[i].id;
1868 int64_t pos = seekheads[i].pos + matroska->segment_start;
1869 MatroskaLevel1Element *elem;
1870
1871 if (id != seekheads[i].id || pos < matroska->segment_start)
1872 continue;
1873
1874 elem = matroska_find_level1_elem(matroska, id, pos);
1875 if (!elem || elem->parsed)
1876 continue;
1877
1878 elem->pos = pos;
1879
1880 // defer cues parsing until we actually need cue data.
1881 if (id == MATROSKA_ID_CUES)
1882 continue;
1883
1884 if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1885 // mark index as broken
1886 matroska->cues_parsing_deferred = -1;
1887 break;
1888 }
1889
1890 elem->parsed = 1;
1891 }
1892 }
1893
matroska_add_index_entries(MatroskaDemuxContext * matroska)1894 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1895 {
1896 EbmlList *index_list;
1897 MatroskaIndex *index;
1898 uint64_t index_scale = 1;
1899 int i, j;
1900
1901 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1902 return;
1903
1904 index_list = &matroska->index;
1905 index = index_list->elem;
1906 if (index_list->nb_elem < 2)
1907 return;
1908 if (index[1].time > 1E14 / matroska->time_scale) {
1909 av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1910 return;
1911 }
1912 for (i = 0; i < index_list->nb_elem; i++) {
1913 EbmlList *pos_list = &index[i].pos;
1914 MatroskaIndexPos *pos = pos_list->elem;
1915 for (j = 0; j < pos_list->nb_elem; j++) {
1916 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1917 pos[j].track);
1918 if (track && track->stream)
1919 av_add_index_entry(track->stream,
1920 pos[j].pos + matroska->segment_start,
1921 index[i].time / index_scale, 0, 0,
1922 AVINDEX_KEYFRAME);
1923 }
1924 }
1925 }
1926
matroska_parse_cues(MatroskaDemuxContext * matroska)1927 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1928 int i;
1929
1930 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1931 return;
1932
1933 for (i = 0; i < matroska->num_level1_elems; i++) {
1934 MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1935 if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1936 if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1937 matroska->cues_parsing_deferred = -1;
1938 elem->parsed = 1;
1939 break;
1940 }
1941 }
1942
1943 matroska_add_index_entries(matroska);
1944 }
1945
matroska_aac_profile(char * codec_id)1946 static int matroska_aac_profile(char *codec_id)
1947 {
1948 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1949 int profile;
1950
1951 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1952 if (strstr(codec_id, aac_profiles[profile]))
1953 break;
1954 return profile + 1;
1955 }
1956
matroska_aac_sri(int samplerate)1957 static int matroska_aac_sri(int samplerate)
1958 {
1959 int sri;
1960
1961 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1962 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1963 break;
1964 return sri;
1965 }
1966
matroska_metadata_creation_time(AVDictionary ** metadata,int64_t date_utc)1967 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1968 {
1969 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1970 avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1971 }
1972
matroska_parse_flac(AVFormatContext * s,MatroskaTrack * track,int * offset)1973 static int matroska_parse_flac(AVFormatContext *s,
1974 MatroskaTrack *track,
1975 int *offset)
1976 {
1977 AVStream *st = track->stream;
1978 uint8_t *p = track->codec_priv.data;
1979 int size = track->codec_priv.size;
1980
1981 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1982 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1983 track->codec_priv.size = 0;
1984 return 0;
1985 }
1986 *offset = 8;
1987 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1988
1989 p += track->codec_priv.size;
1990 size -= track->codec_priv.size;
1991
1992 /* parse the remaining metadata blocks if present */
1993 while (size >= 4) {
1994 int block_last, block_type, block_size;
1995
1996 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1997
1998 p += 4;
1999 size -= 4;
2000 if (block_size > size)
2001 return 0;
2002
2003 /* check for the channel mask */
2004 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
2005 AVDictionary *dict = NULL;
2006 AVDictionaryEntry *chmask;
2007
2008 ff_vorbis_comment(s, &dict, p, block_size, 0);
2009 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
2010 if (chmask) {
2011 uint64_t mask = strtol(chmask->value, NULL, 0);
2012 if (!mask || mask & ~0x3ffffULL) {
2013 av_log(s, AV_LOG_WARNING,
2014 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
2015 } else
2016 st->codecpar->channel_layout = mask;
2017 }
2018 av_dict_free(&dict);
2019 }
2020
2021 p += block_size;
2022 size -= block_size;
2023 }
2024
2025 return 0;
2026 }
2027
mkv_field_order(MatroskaDemuxContext * matroska,int64_t field_order)2028 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2029 {
2030 int major, minor, micro, bttb = 0;
2031
2032 /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2033 * this function, and fixed in 57.52 */
2034 if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, µ) == 3)
2035 bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
2036
2037 switch (field_order) {
2038 case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
2039 return AV_FIELD_PROGRESSIVE;
2040 case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
2041 return AV_FIELD_UNKNOWN;
2042 case MATROSKA_VIDEO_FIELDORDER_TT:
2043 return AV_FIELD_TT;
2044 case MATROSKA_VIDEO_FIELDORDER_BB:
2045 return AV_FIELD_BB;
2046 case MATROSKA_VIDEO_FIELDORDER_BT:
2047 return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2048 case MATROSKA_VIDEO_FIELDORDER_TB:
2049 return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2050 default:
2051 return AV_FIELD_UNKNOWN;
2052 }
2053 }
2054
mkv_stereo_mode_display_mul(int stereo_mode,int * h_width,int * h_height)2055 static void mkv_stereo_mode_display_mul(int stereo_mode,
2056 int *h_width, int *h_height)
2057 {
2058 switch (stereo_mode) {
2059 case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
2060 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
2061 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
2062 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
2063 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
2064 break;
2065 case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
2066 case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
2067 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
2068 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
2069 *h_width = 2;
2070 break;
2071 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
2072 case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
2073 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
2074 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
2075 *h_height = 2;
2076 break;
2077 }
2078 }
2079
mkv_parse_video_color(AVStream * st,const MatroskaTrack * track)2080 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2081 const MatroskaTrackVideoColor *color = track->video.color.elem;
2082 const MatroskaMasteringMeta *mastering_meta;
2083 int has_mastering_primaries, has_mastering_luminance;
2084
2085 if (!track->video.color.nb_elem)
2086 return 0;
2087
2088 mastering_meta = &color->mastering_meta;
2089 // Mastering primaries are CIE 1931 coords, and must be > 0.
2090 has_mastering_primaries =
2091 mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2092 mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2093 mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2094 mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2095 has_mastering_luminance = mastering_meta->max_luminance > 0;
2096
2097 if (color->matrix_coefficients != AVCOL_SPC_RESERVED)
2098 st->codecpar->color_space = color->matrix_coefficients;
2099 if (color->primaries != AVCOL_PRI_RESERVED &&
2100 color->primaries != AVCOL_PRI_RESERVED0)
2101 st->codecpar->color_primaries = color->primaries;
2102 if (color->transfer_characteristics != AVCOL_TRC_RESERVED &&
2103 color->transfer_characteristics != AVCOL_TRC_RESERVED0)
2104 st->codecpar->color_trc = color->transfer_characteristics;
2105 if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2106 color->range <= AVCOL_RANGE_JPEG)
2107 st->codecpar->color_range = color->range;
2108 if (color->chroma_siting_horz != MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED &&
2109 color->chroma_siting_vert != MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED &&
2110 color->chroma_siting_horz < MATROSKA_COLOUR_CHROMASITINGHORZ_NB &&
2111 color->chroma_siting_vert < MATROSKA_COLOUR_CHROMASITINGVERT_NB) {
2112 st->codecpar->chroma_location =
2113 avcodec_chroma_pos_to_enum((color->chroma_siting_horz - 1) << 7,
2114 (color->chroma_siting_vert - 1) << 7);
2115 }
2116 if (color->max_cll && color->max_fall) {
2117 size_t size = 0;
2118 int ret;
2119 AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
2120 if (!metadata)
2121 return AVERROR(ENOMEM);
2122 ret = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
2123 (uint8_t *)metadata, size);
2124 if (ret < 0) {
2125 av_freep(&metadata);
2126 return ret;
2127 }
2128 metadata->MaxCLL = color->max_cll;
2129 metadata->MaxFALL = color->max_fall;
2130 }
2131
2132 if (has_mastering_primaries || has_mastering_luminance) {
2133 AVMasteringDisplayMetadata *metadata =
2134 (AVMasteringDisplayMetadata*) av_stream_new_side_data(
2135 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
2136 sizeof(AVMasteringDisplayMetadata));
2137 if (!metadata) {
2138 return AVERROR(ENOMEM);
2139 }
2140 memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2141 if (has_mastering_primaries) {
2142 metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2143 metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2144 metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2145 metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2146 metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2147 metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2148 metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2149 metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2150 metadata->has_primaries = 1;
2151 }
2152 if (has_mastering_luminance) {
2153 metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2154 metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
2155 metadata->has_luminance = 1;
2156 }
2157 }
2158 return 0;
2159 }
2160
mkv_parse_video_projection(AVStream * st,const MatroskaTrack * track,void * logctx)2161 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
2162 void *logctx)
2163 {
2164 AVSphericalMapping *spherical;
2165 enum AVSphericalProjection projection;
2166 size_t spherical_size;
2167 uint32_t l = 0, t = 0, r = 0, b = 0;
2168 uint32_t padding = 0;
2169 int ret;
2170 GetByteContext gb;
2171
2172 bytestream2_init(&gb, track->video.projection.private.data,
2173 track->video.projection.private.size);
2174
2175 if (bytestream2_get_byte(&gb) != 0) {
2176 av_log(logctx, AV_LOG_WARNING, "Unknown spherical metadata\n");
2177 return 0;
2178 }
2179
2180 bytestream2_skip(&gb, 3); // flags
2181
2182 switch (track->video.projection.type) {
2183 case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
2184 if (track->video.projection.private.size == 20) {
2185 t = bytestream2_get_be32(&gb);
2186 b = bytestream2_get_be32(&gb);
2187 l = bytestream2_get_be32(&gb);
2188 r = bytestream2_get_be32(&gb);
2189
2190 if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2191 av_log(logctx, AV_LOG_ERROR,
2192 "Invalid bounding rectangle coordinates "
2193 "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2194 l, t, r, b);
2195 return AVERROR_INVALIDDATA;
2196 }
2197 } else if (track->video.projection.private.size != 0) {
2198 av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2199 return AVERROR_INVALIDDATA;
2200 }
2201
2202 if (l || t || r || b)
2203 projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2204 else
2205 projection = AV_SPHERICAL_EQUIRECTANGULAR;
2206 break;
2207 case MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP:
2208 if (track->video.projection.private.size < 4) {
2209 av_log(logctx, AV_LOG_ERROR, "Missing projection private properties\n");
2210 return AVERROR_INVALIDDATA;
2211 } else if (track->video.projection.private.size == 12) {
2212 uint32_t layout = bytestream2_get_be32(&gb);
2213 if (layout) {
2214 av_log(logctx, AV_LOG_WARNING,
2215 "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2216 return 0;
2217 }
2218 projection = AV_SPHERICAL_CUBEMAP;
2219 padding = bytestream2_get_be32(&gb);
2220 } else {
2221 av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2222 return AVERROR_INVALIDDATA;
2223 }
2224 break;
2225 case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
2226 /* No Spherical metadata */
2227 return 0;
2228 default:
2229 av_log(logctx, AV_LOG_WARNING,
2230 "Unknown spherical metadata type %"PRIu64"\n",
2231 track->video.projection.type);
2232 return 0;
2233 }
2234
2235 spherical = av_spherical_alloc(&spherical_size);
2236 if (!spherical)
2237 return AVERROR(ENOMEM);
2238
2239 spherical->projection = projection;
2240
2241 spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2242 spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2243 spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2244
2245 spherical->padding = padding;
2246
2247 spherical->bound_left = l;
2248 spherical->bound_top = t;
2249 spherical->bound_right = r;
2250 spherical->bound_bottom = b;
2251
2252 ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2253 spherical_size);
2254 if (ret < 0) {
2255 av_freep(&spherical);
2256 return ret;
2257 }
2258
2259 return 0;
2260 }
2261
get_qt_codec(MatroskaTrack * track,uint32_t * fourcc,enum AVCodecID * codec_id)2262 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2263 {
2264 const AVCodecTag *codec_tags;
2265
2266 codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2267 ff_codec_movvideo_tags : ff_codec_movaudio_tags;
2268
2269 /* Normalize noncompliant private data that starts with the fourcc
2270 * by expanding/shifting the data by 4 bytes and storing the data
2271 * size at the start. */
2272 if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2273 int ret = av_buffer_realloc(&track->codec_priv.buf,
2274 track->codec_priv.size + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
2275 if (ret < 0)
2276 return ret;
2277
2278 track->codec_priv.data = track->codec_priv.buf->data;
2279 memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2280 track->codec_priv.size += 4;
2281 AV_WB32(track->codec_priv.data, track->codec_priv.size);
2282 }
2283
2284 *fourcc = AV_RL32(track->codec_priv.data + 4);
2285 *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2286
2287 return 0;
2288 }
2289
matroska_parse_tracks(AVFormatContext * s)2290 static int matroska_parse_tracks(AVFormatContext *s)
2291 {
2292 MatroskaDemuxContext *matroska = s->priv_data;
2293 MatroskaTrack *tracks = matroska->tracks.elem;
2294 AVStream *st;
2295 int i, j, ret;
2296 int k;
2297
2298 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2299 MatroskaTrack *track = &tracks[i];
2300 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
2301 EbmlList *encodings_list = &track->encodings;
2302 MatroskaTrackEncoding *encodings = encodings_list->elem;
2303 uint8_t *extradata = NULL;
2304 int extradata_size = 0;
2305 int extradata_offset = 0;
2306 uint32_t fourcc = 0;
2307 AVIOContext b;
2308 char* key_id_base64 = NULL;
2309 int bit_depth = -1;
2310
2311 /* Apply some sanity checks. */
2312 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2313 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2314 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2315 track->type != MATROSKA_TRACK_TYPE_METADATA) {
2316 av_log(matroska->ctx, AV_LOG_INFO,
2317 "Unknown or unsupported track type %"PRIu64"\n",
2318 track->type);
2319 continue;
2320 }
2321 if (!track->codec_id)
2322 continue;
2323
2324 if ( track->type == MATROSKA_TRACK_TYPE_AUDIO && track->codec_id[0] != 'A'
2325 || track->type == MATROSKA_TRACK_TYPE_VIDEO && track->codec_id[0] != 'V'
2326 || track->type == MATROSKA_TRACK_TYPE_SUBTITLE && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2327 || track->type == MATROSKA_TRACK_TYPE_METADATA && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2328 ) {
2329 av_log(matroska->ctx, AV_LOG_INFO, "Inconsistent track type\n");
2330 continue;
2331 }
2332
2333 if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2334 isnan(track->audio.samplerate)) {
2335 av_log(matroska->ctx, AV_LOG_WARNING,
2336 "Invalid sample rate %f, defaulting to 8000 instead.\n",
2337 track->audio.samplerate);
2338 track->audio.samplerate = 8000;
2339 }
2340
2341 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2342 if (!track->default_duration && track->video.frame_rate > 0) {
2343 double default_duration = 1000000000 / track->video.frame_rate;
2344 if (default_duration > UINT64_MAX || default_duration < 0) {
2345 av_log(matroska->ctx, AV_LOG_WARNING,
2346 "Invalid frame rate %e. Cannot calculate default duration.\n",
2347 track->video.frame_rate);
2348 } else {
2349 track->default_duration = default_duration;
2350 }
2351 }
2352 if (track->video.display_width == -1)
2353 track->video.display_width = track->video.pixel_width;
2354 if (track->video.display_height == -1)
2355 track->video.display_height = track->video.pixel_height;
2356 if (track->video.color_space.size == 4)
2357 fourcc = AV_RL32(track->video.color_space.data);
2358 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2359 if (!track->audio.out_samplerate)
2360 track->audio.out_samplerate = track->audio.samplerate;
2361 }
2362 if (encodings_list->nb_elem > 1) {
2363 av_log(matroska->ctx, AV_LOG_ERROR,
2364 "Multiple combined encodings not supported");
2365 } else if (encodings_list->nb_elem == 1) {
2366 if (encodings[0].type) {
2367 if (encodings[0].encryption.key_id.size > 0) {
2368 /* Save the encryption key id to be stored later as a
2369 metadata tag. */
2370 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2371 key_id_base64 = av_malloc(b64_size);
2372 if (key_id_base64 == NULL)
2373 return AVERROR(ENOMEM);
2374
2375 av_base64_encode(key_id_base64, b64_size,
2376 encodings[0].encryption.key_id.data,
2377 encodings[0].encryption.key_id.size);
2378 } else {
2379 encodings[0].scope = 0;
2380 av_log(matroska->ctx, AV_LOG_ERROR,
2381 "Unsupported encoding type");
2382 }
2383 } else if (
2384 #if CONFIG_ZLIB
2385 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2386 #endif
2387 #if CONFIG_BZLIB
2388 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
2389 #endif
2390 #if CONFIG_LZO
2391 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
2392 #endif
2393 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
2394 encodings[0].scope = 0;
2395 av_log(matroska->ctx, AV_LOG_ERROR,
2396 "Unsupported encoding type");
2397 } else if (track->codec_priv.size && encodings[0].scope & 2) {
2398 uint8_t *codec_priv = track->codec_priv.data;
2399 int ret = matroska_decode_buffer(&track->codec_priv.data,
2400 &track->codec_priv.size,
2401 track);
2402 if (ret < 0) {
2403 track->codec_priv.data = NULL;
2404 track->codec_priv.size = 0;
2405 av_log(matroska->ctx, AV_LOG_ERROR,
2406 "Failed to decode codec private data\n");
2407 }
2408
2409 if (codec_priv != track->codec_priv.data) {
2410 av_buffer_unref(&track->codec_priv.buf);
2411 if (track->codec_priv.data) {
2412 track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2413 track->codec_priv.size + AV_INPUT_BUFFER_PADDING_SIZE,
2414 NULL, NULL, 0);
2415 if (!track->codec_priv.buf) {
2416 av_freep(&track->codec_priv.data);
2417 track->codec_priv.size = 0;
2418 return AVERROR(ENOMEM);
2419 }
2420 }
2421 }
2422 }
2423 }
2424 track->needs_decoding = encodings && !encodings[0].type &&
2425 encodings[0].scope & 1 &&
2426 (encodings[0].compression.algo !=
2427 MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP ||
2428 encodings[0].compression.settings.size);
2429
2430 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2431 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2432 strlen(ff_mkv_codec_tags[j].str))) {
2433 codec_id = ff_mkv_codec_tags[j].id;
2434 break;
2435 }
2436 }
2437
2438 st = track->stream = avformat_new_stream(s, NULL);
2439 if (!st) {
2440 av_free(key_id_base64);
2441 return AVERROR(ENOMEM);
2442 }
2443
2444 if (key_id_base64) {
2445 /* export encryption key id as base64 metadata tag */
2446 av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2447 AV_DICT_DONT_STRDUP_VAL);
2448 }
2449
2450 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2451 track->codec_priv.size >= 40 &&
2452 track->codec_priv.data) {
2453 track->ms_compat = 1;
2454 bit_depth = AV_RL16(track->codec_priv.data + 14);
2455 fourcc = AV_RL32(track->codec_priv.data + 16);
2456 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
2457 fourcc);
2458 if (!codec_id)
2459 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
2460 fourcc);
2461 extradata_offset = 40;
2462 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2463 track->codec_priv.size >= 14 &&
2464 track->codec_priv.data) {
2465 int ret;
2466 ffio_init_context(&b, track->codec_priv.data,
2467 track->codec_priv.size,
2468 0, NULL, NULL, NULL, NULL);
2469 ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2470 if (ret < 0)
2471 return ret;
2472 codec_id = st->codecpar->codec_id;
2473 fourcc = st->codecpar->codec_tag;
2474 extradata_offset = FFMIN(track->codec_priv.size, 18);
2475 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2476 /* Normally 36, but allow noncompliant private data */
2477 && (track->codec_priv.size >= 32)
2478 && (track->codec_priv.data)) {
2479 uint16_t sample_size;
2480 int ret = get_qt_codec(track, &fourcc, &codec_id);
2481 if (ret < 0)
2482 return ret;
2483 sample_size = AV_RB16(track->codec_priv.data + 26);
2484 if (fourcc == 0) {
2485 if (sample_size == 8) {
2486 fourcc = MKTAG('r','a','w',' ');
2487 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2488 } else if (sample_size == 16) {
2489 fourcc = MKTAG('t','w','o','s');
2490 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2491 }
2492 }
2493 if ((fourcc == MKTAG('t','w','o','s') ||
2494 fourcc == MKTAG('s','o','w','t')) &&
2495 sample_size == 8)
2496 codec_id = AV_CODEC_ID_PCM_S8;
2497 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2498 (track->codec_priv.size >= 21) &&
2499 (track->codec_priv.data)) {
2500 int ret = get_qt_codec(track, &fourcc, &codec_id);
2501 if (ret < 0)
2502 return ret;
2503 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2504 fourcc = MKTAG('S','V','Q','3');
2505 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2506 }
2507 if (codec_id == AV_CODEC_ID_NONE)
2508 av_log(matroska->ctx, AV_LOG_ERROR,
2509 "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2510 if (track->codec_priv.size >= 86) {
2511 bit_depth = AV_RB16(track->codec_priv.data + 82);
2512 ffio_init_context(&b, track->codec_priv.data,
2513 track->codec_priv.size,
2514 0, NULL, NULL, NULL, NULL);
2515 if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2516 bit_depth &= 0x1F;
2517 track->has_palette = 1;
2518 }
2519 }
2520 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2521 switch (track->audio.bitdepth) {
2522 case 8:
2523 codec_id = AV_CODEC_ID_PCM_U8;
2524 break;
2525 case 24:
2526 codec_id = AV_CODEC_ID_PCM_S24BE;
2527 break;
2528 case 32:
2529 codec_id = AV_CODEC_ID_PCM_S32BE;
2530 break;
2531 }
2532 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2533 switch (track->audio.bitdepth) {
2534 case 8:
2535 codec_id = AV_CODEC_ID_PCM_U8;
2536 break;
2537 case 24:
2538 codec_id = AV_CODEC_ID_PCM_S24LE;
2539 break;
2540 case 32:
2541 codec_id = AV_CODEC_ID_PCM_S32LE;
2542 break;
2543 }
2544 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2545 track->audio.bitdepth == 64) {
2546 codec_id = AV_CODEC_ID_PCM_F64LE;
2547 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2548 int profile = matroska_aac_profile(track->codec_id);
2549 int sri = matroska_aac_sri(track->audio.samplerate);
2550 extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2551 if (!extradata)
2552 return AVERROR(ENOMEM);
2553 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2554 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2555 if (strstr(track->codec_id, "SBR")) {
2556 sri = matroska_aac_sri(track->audio.out_samplerate);
2557 extradata[2] = 0x56;
2558 extradata[3] = 0xE5;
2559 extradata[4] = 0x80 | (sri << 3);
2560 extradata_size = 5;
2561 } else
2562 extradata_size = 2;
2563 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2564 /* Only ALAC's magic cookie is stored in Matroska's track headers.
2565 * Create the "atom size", "tag", and "tag version" fields the
2566 * decoder expects manually. */
2567 extradata_size = 12 + track->codec_priv.size;
2568 extradata = av_mallocz(extradata_size +
2569 AV_INPUT_BUFFER_PADDING_SIZE);
2570 if (!extradata)
2571 return AVERROR(ENOMEM);
2572 AV_WB32(extradata, extradata_size);
2573 memcpy(&extradata[4], "alac", 4);
2574 AV_WB32(&extradata[8], 0);
2575 memcpy(&extradata[12], track->codec_priv.data,
2576 track->codec_priv.size);
2577 } else if (codec_id == AV_CODEC_ID_TTA) {
2578 uint8_t *ptr;
2579 if (track->audio.channels > UINT16_MAX ||
2580 track->audio.bitdepth > UINT16_MAX) {
2581 av_log(matroska->ctx, AV_LOG_WARNING,
2582 "Too large audio channel number %"PRIu64
2583 " or bitdepth %"PRIu64". Skipping track.\n",
2584 track->audio.channels, track->audio.bitdepth);
2585 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2586 return AVERROR_INVALIDDATA;
2587 else
2588 continue;
2589 }
2590 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2591 return AVERROR_INVALIDDATA;
2592 extradata_size = 22;
2593 extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2594 if (!extradata)
2595 return AVERROR(ENOMEM);
2596 ptr = extradata;
2597 bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2598 bytestream_put_le16(&ptr, 1);
2599 bytestream_put_le16(&ptr, track->audio.channels);
2600 bytestream_put_le16(&ptr, track->audio.bitdepth);
2601 bytestream_put_le32(&ptr, track->audio.out_samplerate);
2602 bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2603 track->audio.out_samplerate,
2604 AV_TIME_BASE * 1000));
2605 } else if (codec_id == AV_CODEC_ID_RV10 ||
2606 codec_id == AV_CODEC_ID_RV20 ||
2607 codec_id == AV_CODEC_ID_RV30 ||
2608 codec_id == AV_CODEC_ID_RV40) {
2609 extradata_offset = 26;
2610 } else if (codec_id == AV_CODEC_ID_RA_144) {
2611 track->audio.out_samplerate = 8000;
2612 track->audio.channels = 1;
2613 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2614 codec_id == AV_CODEC_ID_COOK ||
2615 codec_id == AV_CODEC_ID_ATRAC3 ||
2616 codec_id == AV_CODEC_ID_SIPR)
2617 && track->codec_priv.data) {
2618 int flavor;
2619
2620 ffio_init_context(&b, track->codec_priv.data,
2621 track->codec_priv.size,
2622 0, NULL, NULL, NULL, NULL);
2623 avio_skip(&b, 22);
2624 flavor = avio_rb16(&b);
2625 track->audio.coded_framesize = avio_rb32(&b);
2626 avio_skip(&b, 12);
2627 track->audio.sub_packet_h = avio_rb16(&b);
2628 track->audio.frame_size = avio_rb16(&b);
2629 track->audio.sub_packet_size = avio_rb16(&b);
2630 if (track->audio.coded_framesize <= 0 ||
2631 track->audio.sub_packet_h <= 0 ||
2632 track->audio.frame_size <= 0)
2633 return AVERROR_INVALIDDATA;
2634
2635 if (codec_id == AV_CODEC_ID_RA_288) {
2636 if (track->audio.sub_packet_h & 1 || 2 * track->audio.frame_size
2637 != (int64_t)track->audio.sub_packet_h * track->audio.coded_framesize)
2638 return AVERROR_INVALIDDATA;
2639 st->codecpar->block_align = track->audio.coded_framesize;
2640 track->codec_priv.size = 0;
2641 } else {
2642 if (codec_id == AV_CODEC_ID_SIPR) {
2643 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2644 if (flavor > 3)
2645 return AVERROR_INVALIDDATA;
2646 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2647 st->codecpar->bit_rate = sipr_bit_rate[flavor];
2648 } else if (track->audio.sub_packet_size <= 0 ||
2649 track->audio.frame_size % track->audio.sub_packet_size)
2650 return AVERROR_INVALIDDATA;
2651 st->codecpar->block_align = track->audio.sub_packet_size;
2652 extradata_offset = 78;
2653 }
2654 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2655 track->audio.frame_size);
2656 if (!track->audio.buf)
2657 return AVERROR(ENOMEM);
2658 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2659 ret = matroska_parse_flac(s, track, &extradata_offset);
2660 if (ret < 0)
2661 return ret;
2662 } else if (codec_id == AV_CODEC_ID_WAVPACK && track->codec_priv.size < 2) {
2663 av_log(matroska->ctx, AV_LOG_INFO, "Assuming WavPack version 4.10 "
2664 "in absence of valid CodecPrivate.\n");
2665 extradata_size = 2;
2666 extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
2667 if (!extradata)
2668 return AVERROR(ENOMEM);
2669 AV_WL16(extradata, 0x410);
2670 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2671 fourcc = AV_RL32(track->codec_priv.data);
2672 } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2673 /* we don't need any value stored in CodecPrivate.
2674 make sure that it's not exported as extradata. */
2675 track->codec_priv.size = 0;
2676 } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2677 /* For now, propagate only the OBUs, if any. Once libavcodec is
2678 updated to handle isobmff style extradata this can be removed. */
2679 extradata_offset = 4;
2680 }
2681 track->codec_priv.size -= extradata_offset;
2682
2683 if (codec_id == AV_CODEC_ID_NONE)
2684 av_log(matroska->ctx, AV_LOG_INFO,
2685 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2686
2687 if (track->time_scale < 0.01)
2688 track->time_scale = 1.0;
2689 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2690 1000 * 1000 * 1000); /* 64 bit pts in ns */
2691
2692 /* convert the delay from ns to the track timebase */
2693 track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
2694 (AVRational){ 1, 1000000000 },
2695 st->time_base);
2696
2697 st->codecpar->codec_id = codec_id;
2698
2699 if (strcmp(track->language, "und"))
2700 av_dict_set(&st->metadata, "language", track->language, 0);
2701 av_dict_set(&st->metadata, "title", track->name, 0);
2702
2703 if (track->flag_default)
2704 st->disposition |= AV_DISPOSITION_DEFAULT;
2705 if (track->flag_forced)
2706 st->disposition |= AV_DISPOSITION_FORCED;
2707
2708 if (!st->codecpar->extradata) {
2709 if (extradata) {
2710 st->codecpar->extradata = extradata;
2711 st->codecpar->extradata_size = extradata_size;
2712 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2713 if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2714 return AVERROR(ENOMEM);
2715 memcpy(st->codecpar->extradata,
2716 track->codec_priv.data + extradata_offset,
2717 track->codec_priv.size);
2718 }
2719 }
2720
2721 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2722 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
2723 int display_width_mul = 1;
2724 int display_height_mul = 1;
2725
2726 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2727 st->codecpar->codec_tag = fourcc;
2728 if (bit_depth >= 0)
2729 st->codecpar->bits_per_coded_sample = bit_depth;
2730 st->codecpar->width = track->video.pixel_width;
2731 st->codecpar->height = track->video.pixel_height;
2732
2733 if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
2734 st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2735 else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
2736 st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2737
2738 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2739 mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2740
2741 if (track->video.display_unit < MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN) {
2742 av_reduce(&st->sample_aspect_ratio.num,
2743 &st->sample_aspect_ratio.den,
2744 st->codecpar->height * track->video.display_width * display_width_mul,
2745 st->codecpar->width * track->video.display_height * display_height_mul,
2746 255);
2747 }
2748 if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2749 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2750
2751 if (track->default_duration) {
2752 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2753 1000000000, track->default_duration, 30000);
2754 #if FF_API_R_FRAME_RATE
2755 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2756 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2757 st->r_frame_rate = st->avg_frame_rate;
2758 #endif
2759 }
2760
2761 /* export stereo mode flag as metadata tag */
2762 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2763 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2764
2765 /* export alpha mode flag as metadata tag */
2766 if (track->video.alpha_mode)
2767 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2768
2769 /* if we have virtual track, mark the real tracks */
2770 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2771 char buf[32];
2772 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2773 continue;
2774 snprintf(buf, sizeof(buf), "%s_%d",
2775 ff_matroska_video_stereo_plane[planes[j].type], i);
2776 for (k=0; k < matroska->tracks.nb_elem; k++)
2777 if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2778 av_dict_set(&tracks[k].stream->metadata,
2779 "stereo_mode", buf, 0);
2780 break;
2781 }
2782 }
2783 // add stream level stereo3d side data if it is a supported format
2784 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
2785 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2786 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2787 if (ret < 0)
2788 return ret;
2789 }
2790
2791 ret = mkv_parse_video_color(st, track);
2792 if (ret < 0)
2793 return ret;
2794 ret = mkv_parse_video_projection(st, track, matroska->ctx);
2795 if (ret < 0)
2796 return ret;
2797 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2798 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
2799 st->codecpar->codec_tag = fourcc;
2800 st->codecpar->sample_rate = track->audio.out_samplerate;
2801 st->codecpar->channels = track->audio.channels;
2802 if (!st->codecpar->bits_per_coded_sample)
2803 st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
2804 if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2805 st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2806 st->codecpar->codec_id == AV_CODEC_ID_TRUEHD)
2807 st->need_parsing = AVSTREAM_PARSE_FULL;
2808 else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2809 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2810 if (track->codec_delay > 0) {
2811 st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
2812 (AVRational){1, 1000000000},
2813 (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2814 48000 : st->codecpar->sample_rate});
2815 }
2816 if (track->seek_preroll > 0) {
2817 st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
2818 (AVRational){1, 1000000000},
2819 (AVRational){1, st->codecpar->sample_rate});
2820 }
2821 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2822 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2823
2824 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2825 st->disposition |= AV_DISPOSITION_CAPTIONS;
2826 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2827 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2828 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2829 st->disposition |= AV_DISPOSITION_METADATA;
2830 }
2831 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2832 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2833 }
2834 }
2835
2836 return 0;
2837 }
2838
matroska_read_header(AVFormatContext * s)2839 static int matroska_read_header(AVFormatContext *s)
2840 {
2841 MatroskaDemuxContext *matroska = s->priv_data;
2842 EbmlList *attachments_list = &matroska->attachments;
2843 EbmlList *chapters_list = &matroska->chapters;
2844 MatroskaAttachment *attachments;
2845 MatroskaChapter *chapters;
2846 uint64_t max_start = 0;
2847 int64_t pos;
2848 Ebml ebml = { 0 };
2849 int i, j, res;
2850
2851 matroska->ctx = s;
2852 matroska->cues_parsing_deferred = 1;
2853
2854 /* First read the EBML header. */
2855 if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2856 av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2857 ebml_free(ebml_syntax, &ebml);
2858 return AVERROR_INVALIDDATA;
2859 }
2860 if (ebml.version > EBML_VERSION ||
2861 ebml.max_size > sizeof(uint64_t) ||
2862 ebml.id_length > sizeof(uint32_t) ||
2863 ebml.doctype_version > 3) {
2864 avpriv_report_missing_feature(matroska->ctx,
2865 "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2866 ebml.version, ebml.doctype, ebml.doctype_version);
2867 ebml_free(ebml_syntax, &ebml);
2868 return AVERROR_PATCHWELCOME;
2869 } else if (ebml.doctype_version == 3) {
2870 av_log(matroska->ctx, AV_LOG_WARNING,
2871 "EBML header using unsupported features\n"
2872 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2873 ebml.version, ebml.doctype, ebml.doctype_version);
2874 }
2875 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2876 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2877 break;
2878 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2879 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2880 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2881 ebml_free(ebml_syntax, &ebml);
2882 return AVERROR_INVALIDDATA;
2883 }
2884 }
2885 ebml_free(ebml_syntax, &ebml);
2886
2887 /* The next thing is a segment. */
2888 pos = avio_tell(matroska->ctx->pb);
2889 res = ebml_parse(matroska, matroska_segments, matroska);
2890 // Try resyncing until we find an EBML_STOP type element.
2891 while (res != 1) {
2892 res = matroska_resync(matroska, pos);
2893 if (res < 0)
2894 goto fail;
2895 pos = avio_tell(matroska->ctx->pb);
2896 res = ebml_parse(matroska, matroska_segment, matroska);
2897 }
2898 /* Set data_offset as it might be needed later by seek_frame_generic. */
2899 if (matroska->current_id == MATROSKA_ID_CLUSTER)
2900 s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2901 matroska_execute_seekhead(matroska);
2902
2903 if (!matroska->time_scale)
2904 matroska->time_scale = 1000000;
2905 if (matroska->duration)
2906 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2907 1000 / AV_TIME_BASE;
2908 av_dict_set(&s->metadata, "title", matroska->title, 0);
2909 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2910
2911 if (matroska->date_utc.size == 8)
2912 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2913
2914 res = matroska_parse_tracks(s);
2915 if (res < 0)
2916 goto fail;
2917
2918 attachments = attachments_list->elem;
2919 for (j = 0; j < attachments_list->nb_elem; j++) {
2920 if (!(attachments[j].filename && attachments[j].mime &&
2921 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2922 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2923 } else {
2924 AVStream *st = avformat_new_stream(s, NULL);
2925 if (!st)
2926 break;
2927 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2928 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2929 if (attachments[j].description)
2930 av_dict_set(&st->metadata, "title", attachments[j].description, 0);
2931 st->codecpar->codec_id = AV_CODEC_ID_NONE;
2932
2933 for (i = 0; mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2934 if (!strncmp(mkv_image_mime_tags[i].str, attachments[j].mime,
2935 strlen(mkv_image_mime_tags[i].str))) {
2936 st->codecpar->codec_id = mkv_image_mime_tags[i].id;
2937 break;
2938 }
2939 }
2940
2941 attachments[j].stream = st;
2942
2943 if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2944 AVPacket *pkt = &st->attached_pic;
2945
2946 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
2947 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2948
2949 av_init_packet(pkt);
2950 pkt->buf = attachments[j].bin.buf;
2951 attachments[j].bin.buf = NULL;
2952 pkt->data = attachments[j].bin.data;
2953 pkt->size = attachments[j].bin.size;
2954 pkt->stream_index = st->index;
2955 pkt->flags |= AV_PKT_FLAG_KEY;
2956 } else {
2957 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2958 if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2959 break;
2960 memcpy(st->codecpar->extradata, attachments[j].bin.data,
2961 attachments[j].bin.size);
2962
2963 for (i = 0; mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2964 if (!strncmp(mkv_mime_tags[i].str, attachments[j].mime,
2965 strlen(mkv_mime_tags[i].str))) {
2966 st->codecpar->codec_id = mkv_mime_tags[i].id;
2967 break;
2968 }
2969 }
2970 }
2971 }
2972 }
2973
2974 chapters = chapters_list->elem;
2975 for (i = 0; i < chapters_list->nb_elem; i++)
2976 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2977 (max_start == 0 || chapters[i].start > max_start)) {
2978 chapters[i].chapter =
2979 avpriv_new_chapter(s, chapters[i].uid,
2980 (AVRational) { 1, 1000000000 },
2981 chapters[i].start, chapters[i].end,
2982 chapters[i].title);
2983 max_start = chapters[i].start;
2984 }
2985
2986 matroska_add_index_entries(matroska);
2987
2988 matroska_convert_tags(s);
2989
2990 return 0;
2991 fail:
2992 matroska_read_close(s);
2993 return res;
2994 }
2995
2996 /*
2997 * Put one packet in an application-supplied AVPacket struct.
2998 * Returns 0 on success or -1 on failure.
2999 */
matroska_deliver_packet(MatroskaDemuxContext * matroska,AVPacket * pkt)3000 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
3001 AVPacket *pkt)
3002 {
3003 if (matroska->queue) {
3004 MatroskaTrack *tracks = matroska->tracks.elem;
3005 MatroskaTrack *track;
3006
3007 ff_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
3008 track = &tracks[pkt->stream_index];
3009 if (track->has_palette) {
3010 uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
3011 if (!pal) {
3012 av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
3013 } else {
3014 memcpy(pal, track->palette, AVPALETTE_SIZE);
3015 }
3016 track->has_palette = 0;
3017 }
3018 return 0;
3019 }
3020
3021 return -1;
3022 }
3023
3024 /*
3025 * Free all packets in our internal queue.
3026 */
matroska_clear_queue(MatroskaDemuxContext * matroska)3027 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
3028 {
3029 ff_packet_list_free(&matroska->queue, &matroska->queue_end);
3030 }
3031
matroska_parse_laces(MatroskaDemuxContext * matroska,uint8_t ** buf,int size,int type,AVIOContext * pb,uint32_t lace_size[256],int * laces)3032 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
3033 int size, int type, AVIOContext *pb,
3034 uint32_t lace_size[256], int *laces)
3035 {
3036 int n;
3037 uint8_t *data = *buf;
3038
3039 if (!type) {
3040 *laces = 1;
3041 lace_size[0] = size;
3042 return 0;
3043 }
3044
3045 if (size <= 0)
3046 return AVERROR_INVALIDDATA;
3047
3048 *laces = *data + 1;
3049 data += 1;
3050 size -= 1;
3051
3052 switch (type) {
3053 case 0x1: /* Xiph lacing */
3054 {
3055 uint8_t temp;
3056 uint32_t total = 0;
3057 for (n = 0; n < *laces - 1; n++) {
3058 lace_size[n] = 0;
3059
3060 do {
3061 if (size <= total)
3062 return AVERROR_INVALIDDATA;
3063 temp = *data;
3064 total += temp;
3065 lace_size[n] += temp;
3066 data += 1;
3067 size -= 1;
3068 } while (temp == 0xff);
3069 }
3070 if (size < total)
3071 return AVERROR_INVALIDDATA;
3072
3073 lace_size[n] = size - total;
3074 break;
3075 }
3076
3077 case 0x2: /* fixed-size lacing */
3078 if (size % (*laces))
3079 return AVERROR_INVALIDDATA;
3080 for (n = 0; n < *laces; n++)
3081 lace_size[n] = size / *laces;
3082 break;
3083
3084 case 0x3: /* EBML lacing */
3085 {
3086 uint64_t num;
3087 uint64_t total;
3088 int offset;
3089
3090 avio_skip(pb, 4);
3091
3092 n = ebml_read_num(matroska, pb, 8, &num, 1);
3093 if (n < 0)
3094 return n;
3095 if (num > INT_MAX)
3096 return AVERROR_INVALIDDATA;
3097
3098 total = lace_size[0] = num;
3099 offset = n;
3100 for (n = 1; n < *laces - 1; n++) {
3101 int64_t snum;
3102 int r;
3103 r = matroska_ebmlnum_sint(matroska, pb, &snum);
3104 if (r < 0)
3105 return r;
3106 if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3107 return AVERROR_INVALIDDATA;
3108
3109 lace_size[n] = lace_size[n - 1] + snum;
3110 total += lace_size[n];
3111 offset += r;
3112 }
3113 data += offset;
3114 size -= offset;
3115 if (size < total)
3116 return AVERROR_INVALIDDATA;
3117
3118 lace_size[*laces - 1] = size - total;
3119 break;
3120 }
3121 }
3122
3123 *buf = data;
3124
3125 return 0;
3126 }
3127
matroska_parse_rm_audio(MatroskaDemuxContext * matroska,MatroskaTrack * track,AVStream * st,uint8_t * data,int size,uint64_t timecode,int64_t pos)3128 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
3129 MatroskaTrack *track, AVStream *st,
3130 uint8_t *data, int size, uint64_t timecode,
3131 int64_t pos)
3132 {
3133 const int a = st->codecpar->block_align;
3134 const int sps = track->audio.sub_packet_size;
3135 const int cfs = track->audio.coded_framesize;
3136 const int h = track->audio.sub_packet_h;
3137 const int w = track->audio.frame_size;
3138 int y = track->audio.sub_packet_cnt;
3139 int x;
3140
3141 if (!track->audio.pkt_cnt) {
3142 if (track->audio.sub_packet_cnt == 0)
3143 track->audio.buf_timecode = timecode;
3144 if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3145 if (size < cfs * h / 2) {
3146 av_log(matroska->ctx, AV_LOG_ERROR,
3147 "Corrupt int4 RM-style audio packet size\n");
3148 return AVERROR_INVALIDDATA;
3149 }
3150 for (x = 0; x < h / 2; x++)
3151 memcpy(track->audio.buf + x * 2 * w + y * cfs,
3152 data + x * cfs, cfs);
3153 } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3154 if (size < w) {
3155 av_log(matroska->ctx, AV_LOG_ERROR,
3156 "Corrupt sipr RM-style audio packet size\n");
3157 return AVERROR_INVALIDDATA;
3158 }
3159 memcpy(track->audio.buf + y * w, data, w);
3160 } else {
3161 if (size < w) {
3162 av_log(matroska->ctx, AV_LOG_ERROR,
3163 "Corrupt generic RM-style audio packet size\n");
3164 return AVERROR_INVALIDDATA;
3165 }
3166 for (x = 0; x < w / sps; x++)
3167 memcpy(track->audio.buf +
3168 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3169 data + x * sps, sps);
3170 }
3171
3172 if (++track->audio.sub_packet_cnt >= h) {
3173 if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3174 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3175 track->audio.sub_packet_cnt = 0;
3176 track->audio.pkt_cnt = h * w / a;
3177 }
3178 }
3179
3180 while (track->audio.pkt_cnt) {
3181 int ret;
3182 AVPacket pktl, *pkt = &pktl;
3183
3184 ret = av_new_packet(pkt, a);
3185 if (ret < 0) {
3186 return ret;
3187 }
3188 memcpy(pkt->data,
3189 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3190 a);
3191 pkt->pts = track->audio.buf_timecode;
3192 track->audio.buf_timecode = AV_NOPTS_VALUE;
3193 pkt->pos = pos;
3194 pkt->stream_index = st->index;
3195 ret = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3196 if (ret < 0) {
3197 av_packet_unref(pkt);
3198 return AVERROR(ENOMEM);
3199 }
3200 }
3201
3202 return 0;
3203 }
3204
3205 /* reconstruct full wavpack blocks from mangled matroska ones */
matroska_parse_wavpack(MatroskaTrack * track,uint8_t ** data,int * size)3206 static int matroska_parse_wavpack(MatroskaTrack *track,
3207 uint8_t **data, int *size)
3208 {
3209 uint8_t *dst = NULL;
3210 uint8_t *src = *data;
3211 int dstlen = 0;
3212 int srclen = *size;
3213 uint32_t samples;
3214 uint16_t ver;
3215 int ret, offset = 0;
3216
3217 if (srclen < 12)
3218 return AVERROR_INVALIDDATA;
3219
3220 av_assert1(track->stream->codecpar->extradata_size >= 2);
3221 ver = AV_RL16(track->stream->codecpar->extradata);
3222
3223 samples = AV_RL32(src);
3224 src += 4;
3225 srclen -= 4;
3226
3227 while (srclen >= 8) {
3228 int multiblock;
3229 uint32_t blocksize;
3230 uint8_t *tmp;
3231
3232 uint32_t flags = AV_RL32(src);
3233 uint32_t crc = AV_RL32(src + 4);
3234 src += 8;
3235 srclen -= 8;
3236
3237 multiblock = (flags & 0x1800) != 0x1800;
3238 if (multiblock) {
3239 if (srclen < 4) {
3240 ret = AVERROR_INVALIDDATA;
3241 goto fail;
3242 }
3243 blocksize = AV_RL32(src);
3244 src += 4;
3245 srclen -= 4;
3246 } else
3247 blocksize = srclen;
3248
3249 if (blocksize > srclen) {
3250 ret = AVERROR_INVALIDDATA;
3251 goto fail;
3252 }
3253
3254 tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3255 if (!tmp) {
3256 ret = AVERROR(ENOMEM);
3257 goto fail;
3258 }
3259 dst = tmp;
3260 dstlen += blocksize + 32;
3261
3262 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3263 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3264 AV_WL16(dst + offset + 8, ver); // version
3265 AV_WL16(dst + offset + 10, 0); // track/index_no
3266 AV_WL32(dst + offset + 12, 0); // total samples
3267 AV_WL32(dst + offset + 16, 0); // block index
3268 AV_WL32(dst + offset + 20, samples); // number of samples
3269 AV_WL32(dst + offset + 24, flags); // flags
3270 AV_WL32(dst + offset + 28, crc); // crc
3271 memcpy(dst + offset + 32, src, blocksize); // block data
3272
3273 src += blocksize;
3274 srclen -= blocksize;
3275 offset += blocksize + 32;
3276 }
3277
3278 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3279
3280 *data = dst;
3281 *size = dstlen;
3282
3283 return 0;
3284
3285 fail:
3286 av_freep(&dst);
3287 return ret;
3288 }
3289
matroska_parse_prores(MatroskaTrack * track,uint8_t ** data,int * size)3290 static int matroska_parse_prores(MatroskaTrack *track,
3291 uint8_t **data, int *size)
3292 {
3293 uint8_t *dst;
3294 int dstlen = *size + 8;
3295
3296 dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3297 if (!dst)
3298 return AVERROR(ENOMEM);
3299
3300 AV_WB32(dst, dstlen);
3301 AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3302 memcpy(dst + 8, *data, dstlen - 8);
3303 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3304
3305 *data = dst;
3306 *size = dstlen;
3307
3308 return 0;
3309 }
3310
matroska_parse_webvtt(MatroskaDemuxContext * matroska,MatroskaTrack * track,AVStream * st,uint8_t * data,int data_len,uint64_t timecode,uint64_t duration,int64_t pos)3311 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
3312 MatroskaTrack *track,
3313 AVStream *st,
3314 uint8_t *data, int data_len,
3315 uint64_t timecode,
3316 uint64_t duration,
3317 int64_t pos)
3318 {
3319 AVPacket pktl, *pkt = &pktl;
3320 uint8_t *id, *settings, *text, *buf;
3321 int id_len, settings_len, text_len;
3322 uint8_t *p, *q;
3323 int err;
3324
3325 if (data_len <= 0)
3326 return AVERROR_INVALIDDATA;
3327
3328 p = data;
3329 q = data + data_len;
3330
3331 id = p;
3332 id_len = -1;
3333 while (p < q) {
3334 if (*p == '\r' || *p == '\n') {
3335 id_len = p - id;
3336 if (*p == '\r')
3337 p++;
3338 break;
3339 }
3340 p++;
3341 }
3342
3343 if (p >= q || *p != '\n')
3344 return AVERROR_INVALIDDATA;
3345 p++;
3346
3347 settings = p;
3348 settings_len = -1;
3349 while (p < q) {
3350 if (*p == '\r' || *p == '\n') {
3351 settings_len = p - settings;
3352 if (*p == '\r')
3353 p++;
3354 break;
3355 }
3356 p++;
3357 }
3358
3359 if (p >= q || *p != '\n')
3360 return AVERROR_INVALIDDATA;
3361 p++;
3362
3363 text = p;
3364 text_len = q - p;
3365 while (text_len > 0) {
3366 const int len = text_len - 1;
3367 const uint8_t c = p[len];
3368 if (c != '\r' && c != '\n')
3369 break;
3370 text_len = len;
3371 }
3372
3373 if (text_len <= 0)
3374 return AVERROR_INVALIDDATA;
3375
3376 err = av_new_packet(pkt, text_len);
3377 if (err < 0) {
3378 return err;
3379 }
3380
3381 memcpy(pkt->data, text, text_len);
3382
3383 if (id_len > 0) {
3384 buf = av_packet_new_side_data(pkt,
3385 AV_PKT_DATA_WEBVTT_IDENTIFIER,
3386 id_len);
3387 if (!buf) {
3388 av_packet_unref(pkt);
3389 return AVERROR(ENOMEM);
3390 }
3391 memcpy(buf, id, id_len);
3392 }
3393
3394 if (settings_len > 0) {
3395 buf = av_packet_new_side_data(pkt,
3396 AV_PKT_DATA_WEBVTT_SETTINGS,
3397 settings_len);
3398 if (!buf) {
3399 av_packet_unref(pkt);
3400 return AVERROR(ENOMEM);
3401 }
3402 memcpy(buf, settings, settings_len);
3403 }
3404
3405 // Do we need this for subtitles?
3406 // pkt->flags = AV_PKT_FLAG_KEY;
3407
3408 pkt->stream_index = st->index;
3409 pkt->pts = timecode;
3410
3411 // Do we need this for subtitles?
3412 // pkt->dts = timecode;
3413
3414 pkt->duration = duration;
3415 pkt->pos = pos;
3416
3417 err = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3418 if (err < 0) {
3419 av_packet_unref(pkt);
3420 return AVERROR(ENOMEM);
3421 }
3422
3423 return 0;
3424 }
3425
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)3426 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
3427 MatroskaTrack *track, AVStream *st,
3428 AVBufferRef *buf, uint8_t *data, int pkt_size,
3429 uint64_t timecode, uint64_t lace_duration,
3430 int64_t pos, int is_keyframe,
3431 uint8_t *additional, uint64_t additional_id, int additional_size,
3432 int64_t discard_padding)
3433 {
3434 uint8_t *pkt_data = data;
3435 int res = 0;
3436 AVPacket pktl, *pkt = &pktl;
3437
3438 if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3439 res = matroska_parse_wavpack(track, &pkt_data, &pkt_size);
3440 if (res < 0) {
3441 av_log(matroska->ctx, AV_LOG_ERROR,
3442 "Error parsing a wavpack block.\n");
3443 goto fail;
3444 }
3445 if (!buf)
3446 av_freep(&data);
3447 buf = NULL;
3448 }
3449
3450 if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3451 AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3452 res = matroska_parse_prores(track, &pkt_data, &pkt_size);
3453 if (res < 0) {
3454 av_log(matroska->ctx, AV_LOG_ERROR,
3455 "Error parsing a prores block.\n");
3456 goto fail;
3457 }
3458 if (!buf)
3459 av_freep(&data);
3460 buf = NULL;
3461 }
3462
3463 if (!pkt_size && !additional_size)
3464 goto no_output;
3465
3466 av_init_packet(pkt);
3467 if (!buf)
3468 pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3469 NULL, NULL, 0);
3470 else
3471 pkt->buf = av_buffer_ref(buf);
3472
3473 if (!pkt->buf) {
3474 res = AVERROR(ENOMEM);
3475 goto fail;
3476 }
3477
3478 pkt->data = pkt_data;
3479 pkt->size = pkt_size;
3480 pkt->flags = is_keyframe;
3481 pkt->stream_index = st->index;
3482
3483 if (additional_size > 0) {
3484 uint8_t *side_data = av_packet_new_side_data(pkt,
3485 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
3486 additional_size + 8);
3487 if (!side_data) {
3488 av_packet_unref(pkt);
3489 return AVERROR(ENOMEM);
3490 }
3491 AV_WB64(side_data, additional_id);
3492 memcpy(side_data + 8, additional, additional_size);
3493 }
3494
3495 if (discard_padding) {
3496 uint8_t *side_data = av_packet_new_side_data(pkt,
3497 AV_PKT_DATA_SKIP_SAMPLES,
3498 10);
3499 if (!side_data) {
3500 av_packet_unref(pkt);
3501 return AVERROR(ENOMEM);
3502 }
3503 discard_padding = av_rescale_q(discard_padding,
3504 (AVRational){1, 1000000000},
3505 (AVRational){1, st->codecpar->sample_rate});
3506 if (discard_padding > 0) {
3507 AV_WL32(side_data + 4, discard_padding);
3508 } else {
3509 AV_WL32(side_data, -discard_padding);
3510 }
3511 }
3512
3513 if (track->ms_compat)
3514 pkt->dts = timecode;
3515 else
3516 pkt->pts = timecode;
3517 pkt->pos = pos;
3518 pkt->duration = lace_duration;
3519
3520 #if FF_API_CONVERGENCE_DURATION
3521 FF_DISABLE_DEPRECATION_WARNINGS
3522 if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3523 pkt->convergence_duration = lace_duration;
3524 }
3525 FF_ENABLE_DEPRECATION_WARNINGS
3526 #endif
3527
3528 res = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3529 if (res < 0) {
3530 av_packet_unref(pkt);
3531 return AVERROR(ENOMEM);
3532 }
3533
3534 return 0;
3535
3536 no_output:
3537 fail:
3538 if (!buf)
3539 av_free(pkt_data);
3540 return res;
3541 }
3542
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)3543 static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf, uint8_t *data,
3544 int size, int64_t pos, uint64_t cluster_time,
3545 uint64_t block_duration, int is_keyframe,
3546 uint8_t *additional, uint64_t additional_id, int additional_size,
3547 int64_t cluster_pos, int64_t discard_padding)
3548 {
3549 uint64_t timecode = AV_NOPTS_VALUE;
3550 MatroskaTrack *track;
3551 AVIOContext pb;
3552 int res = 0;
3553 AVStream *st;
3554 int16_t block_time;
3555 uint32_t lace_size[256];
3556 int n, flags, laces = 0;
3557 uint64_t num;
3558 int trust_default_duration = 1;
3559
3560 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3561
3562 if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3563 return n;
3564 data += n;
3565 size -= n;
3566
3567 track = matroska_find_track_by_num(matroska, num);
3568 if (!track || size < 3)
3569 return AVERROR_INVALIDDATA;
3570
3571 if (!(st = track->stream)) {
3572 av_log(matroska->ctx, AV_LOG_VERBOSE,
3573 "No stream associated to TrackNumber %"PRIu64". "
3574 "Ignoring Block with this TrackNumber.\n", num);
3575 return 0;
3576 }
3577
3578 if (st->discard >= AVDISCARD_ALL)
3579 return res;
3580 if (block_duration > INT64_MAX)
3581 block_duration = INT64_MAX;
3582
3583 block_time = sign_extend(AV_RB16(data), 16);
3584 data += 2;
3585 flags = *data++;
3586 size -= 3;
3587 if (is_keyframe == -1)
3588 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3589
3590 if (cluster_time != (uint64_t) -1 &&
3591 (block_time >= 0 || cluster_time >= -block_time)) {
3592 timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3593 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3594 timecode < track->end_timecode)
3595 is_keyframe = 0; /* overlapping subtitles are not key frame */
3596 if (is_keyframe) {
3597 ff_reduce_index(matroska->ctx, st->index);
3598 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3599 AVINDEX_KEYFRAME);
3600 }
3601 }
3602
3603 if (matroska->skip_to_keyframe &&
3604 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3605 // Compare signed timecodes. Timecode may be negative due to codec delay
3606 // offset. We don't support timestamps greater than int64_t anyway - see
3607 // AVPacket's pts.
3608 if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3609 return res;
3610 if (is_keyframe)
3611 matroska->skip_to_keyframe = 0;
3612 else if (!st->skip_to_keyframe) {
3613 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3614 matroska->skip_to_keyframe = 0;
3615 }
3616 }
3617
3618 res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3619 &pb, lace_size, &laces);
3620 if (res < 0) {
3621 av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3622 return res;
3623 }
3624
3625 if (track->audio.samplerate == 8000) {
3626 // If this is needed for more codecs, then add them here
3627 if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3628 if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3629 trust_default_duration = 0;
3630 }
3631 }
3632
3633 if (!block_duration && trust_default_duration)
3634 block_duration = track->default_duration * laces / matroska->time_scale;
3635
3636 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3637 track->end_timecode =
3638 FFMAX(track->end_timecode, timecode + block_duration);
3639
3640 for (n = 0; n < laces; n++) {
3641 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3642 uint8_t *out_data = data;
3643 int out_size = lace_size[n];
3644
3645 if (track->needs_decoding) {
3646 res = matroska_decode_buffer(&out_data, &out_size, track);
3647 if (res < 0)
3648 return res;
3649 /* Given that we are here means that out_data is no longer
3650 * owned by buf, so set it to NULL. This depends upon
3651 * zero-length header removal compression being ignored. */
3652 av_assert1(out_data != data);
3653 buf = NULL;
3654 }
3655
3656 if (track->audio.buf) {
3657 res = matroska_parse_rm_audio(matroska, track, st,
3658 out_data, out_size,
3659 timecode, pos);
3660 if (!buf)
3661 av_free(out_data);
3662 if (res)
3663 return res;
3664 } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3665 res = matroska_parse_webvtt(matroska, track, st,
3666 out_data, out_size,
3667 timecode, lace_duration,
3668 pos);
3669 if (!buf)
3670 av_free(out_data);
3671 if (res)
3672 return res;
3673 } else {
3674 res = matroska_parse_frame(matroska, track, st, buf, out_data,
3675 out_size, timecode, lace_duration,
3676 pos, !n ? is_keyframe : 0,
3677 additional, additional_id, additional_size,
3678 discard_padding);
3679 if (res)
3680 return res;
3681 }
3682
3683 if (timecode != AV_NOPTS_VALUE)
3684 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3685 data += lace_size[n];
3686 }
3687
3688 return 0;
3689 }
3690
matroska_parse_cluster(MatroskaDemuxContext * matroska)3691 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
3692 {
3693 MatroskaCluster *cluster = &matroska->current_cluster;
3694 MatroskaBlock *block = &cluster->block;
3695 int res;
3696
3697 av_assert0(matroska->num_levels <= 2);
3698
3699 if (matroska->num_levels == 1) {
3700 res = ebml_parse(matroska, matroska_segment, NULL);
3701
3702 if (res == 1) {
3703 /* Found a cluster: subtract the size of the ID already read. */
3704 cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3705
3706 res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3707 if (res < 0)
3708 return res;
3709 }
3710 }
3711
3712 if (matroska->num_levels == 2) {
3713 /* We are inside a cluster. */
3714 res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3715
3716 if (res >= 0 && block->bin.size > 0) {
3717 int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3718 uint8_t* additional = block->additional.size > 0 ?
3719 block->additional.data : NULL;
3720
3721 res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3722 block->bin.size, block->bin.pos,
3723 cluster->timecode, block->duration,
3724 is_keyframe, additional, block->additional_id,
3725 block->additional.size, cluster->pos,
3726 block->discard_padding);
3727 }
3728
3729 ebml_free(matroska_blockgroup, block);
3730 memset(block, 0, sizeof(*block));
3731 } else if (!matroska->num_levels) {
3732 if (!avio_feof(matroska->ctx->pb)) {
3733 avio_r8(matroska->ctx->pb);
3734 if (!avio_feof(matroska->ctx->pb)) {
3735 av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3736 "end of segment.\n");
3737 return AVERROR_INVALIDDATA;
3738 }
3739 }
3740 matroska->done = 1;
3741 return AVERROR_EOF;
3742 }
3743
3744 return res;
3745 }
3746
matroska_read_packet(AVFormatContext * s,AVPacket * pkt)3747 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
3748 {
3749 MatroskaDemuxContext *matroska = s->priv_data;
3750 int ret = 0;
3751
3752 if (matroska->resync_pos == -1) {
3753 // This can only happen if generic seeking has been used.
3754 matroska->resync_pos = avio_tell(s->pb);
3755 }
3756
3757 while (matroska_deliver_packet(matroska, pkt)) {
3758 if (matroska->done)
3759 return (ret < 0) ? ret : AVERROR_EOF;
3760 if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3761 ret = matroska_resync(matroska, matroska->resync_pos);
3762 }
3763
3764 return 0;
3765 }
3766
matroska_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)3767 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3768 int64_t timestamp, int flags)
3769 {
3770 MatroskaDemuxContext *matroska = s->priv_data;
3771 MatroskaTrack *tracks = NULL;
3772 AVStream *st = s->streams[stream_index];
3773 int i, index;
3774
3775 /* Parse the CUES now since we need the index data to seek. */
3776 if (matroska->cues_parsing_deferred > 0) {
3777 matroska->cues_parsing_deferred = 0;
3778 matroska_parse_cues(matroska);
3779 }
3780
3781 if (!st->nb_index_entries)
3782 goto err;
3783 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3784
3785 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3786 matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3787 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3788 matroska_clear_queue(matroska);
3789 if (matroska_parse_cluster(matroska) < 0)
3790 break;
3791 }
3792 }
3793
3794 matroska_clear_queue(matroska);
3795 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3796 goto err;
3797
3798 tracks = matroska->tracks.elem;
3799 for (i = 0; i < matroska->tracks.nb_elem; i++) {
3800 tracks[i].audio.pkt_cnt = 0;
3801 tracks[i].audio.sub_packet_cnt = 0;
3802 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3803 tracks[i].end_timecode = 0;
3804 }
3805
3806 /* We seek to a level 1 element, so set the appropriate status. */
3807 matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3808 if (flags & AVSEEK_FLAG_ANY) {
3809 st->skip_to_keyframe = 0;
3810 matroska->skip_to_timecode = timestamp;
3811 } else {
3812 st->skip_to_keyframe = 1;
3813 matroska->skip_to_timecode = st->index_entries[index].timestamp;
3814 }
3815 matroska->skip_to_keyframe = 1;
3816 matroska->done = 0;
3817 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3818 return 0;
3819 err:
3820 // slightly hackish but allows proper fallback to
3821 // the generic seeking code.
3822 matroska_reset_status(matroska, 0, -1);
3823 matroska->resync_pos = -1;
3824 matroska_clear_queue(matroska);
3825 st->skip_to_keyframe =
3826 matroska->skip_to_keyframe = 0;
3827 matroska->done = 0;
3828 return -1;
3829 }
3830
matroska_read_close(AVFormatContext * s)3831 static int matroska_read_close(AVFormatContext *s)
3832 {
3833 MatroskaDemuxContext *matroska = s->priv_data;
3834 MatroskaTrack *tracks = matroska->tracks.elem;
3835 int n;
3836
3837 matroska_clear_queue(matroska);
3838
3839 for (n = 0; n < matroska->tracks.nb_elem; n++)
3840 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3841 av_freep(&tracks[n].audio.buf);
3842 ebml_free(matroska_segment, matroska);
3843
3844 return 0;
3845 }
3846
3847 typedef struct {
3848 int64_t start_time_ns;
3849 int64_t end_time_ns;
3850 int64_t start_offset;
3851 int64_t end_offset;
3852 } CueDesc;
3853
3854 /* This function searches all the Cues and returns the CueDesc corresponding to
3855 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3856 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3857 */
get_cue_desc(AVFormatContext * s,int64_t ts,int64_t cues_start)3858 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3859 MatroskaDemuxContext *matroska = s->priv_data;
3860 CueDesc cue_desc;
3861 int i;
3862 int nb_index_entries = s->streams[0]->nb_index_entries;
3863 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3864 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3865 for (i = 1; i < nb_index_entries; i++) {
3866 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3867 index_entries[i].timestamp * matroska->time_scale > ts) {
3868 break;
3869 }
3870 }
3871 --i;
3872 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3873 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3874 if (i != nb_index_entries - 1) {
3875 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3876 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3877 } else {
3878 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3879 // FIXME: this needs special handling for files where Cues appear
3880 // before Clusters. the current logic assumes Cues appear after
3881 // Clusters.
3882 cue_desc.end_offset = cues_start - matroska->segment_start;
3883 }
3884 return cue_desc;
3885 }
3886
webm_clusters_start_with_keyframe(AVFormatContext * s)3887 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3888 {
3889 MatroskaDemuxContext *matroska = s->priv_data;
3890 uint32_t id = matroska->current_id;
3891 int64_t cluster_pos, before_pos;
3892 int index, rv = 1;
3893 if (s->streams[0]->nb_index_entries <= 0) return 0;
3894 // seek to the first cluster using cues.
3895 index = av_index_search_timestamp(s->streams[0], 0, 0);
3896 if (index < 0) return 0;
3897 cluster_pos = s->streams[0]->index_entries[index].pos;
3898 before_pos = avio_tell(s->pb);
3899 while (1) {
3900 uint64_t cluster_id, cluster_length;
3901 int read;
3902 AVPacket *pkt;
3903 avio_seek(s->pb, cluster_pos, SEEK_SET);
3904 // read cluster id and length
3905 read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3906 if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3907 break;
3908 read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3909 if (read < 0)
3910 break;
3911
3912 matroska_reset_status(matroska, 0, cluster_pos);
3913 matroska_clear_queue(matroska);
3914 if (matroska_parse_cluster(matroska) < 0 ||
3915 !matroska->queue) {
3916 break;
3917 }
3918 pkt = &matroska->queue->pkt;
3919 // 4 + read is the length of the cluster id and the cluster length field.
3920 cluster_pos += 4 + read + cluster_length;
3921 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3922 rv = 0;
3923 break;
3924 }
3925 }
3926
3927 /* Restore the status after matroska_read_header: */
3928 matroska_reset_status(matroska, id, before_pos);
3929
3930 return rv;
3931 }
3932
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)3933 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3934 double min_buffer, double* buffer,
3935 double* sec_to_download, AVFormatContext *s,
3936 int64_t cues_start)
3937 {
3938 double nano_seconds_per_second = 1000000000.0;
3939 double time_sec = time_ns / nano_seconds_per_second;
3940 int rv = 0;
3941 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3942 int64_t end_time_ns = time_ns + time_to_search_ns;
3943 double sec_downloaded = 0.0;
3944 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3945 if (desc_curr.start_time_ns == -1)
3946 return -1;
3947 *sec_to_download = 0.0;
3948
3949 // Check for non cue start time.
3950 if (time_ns > desc_curr.start_time_ns) {
3951 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3952 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3953 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3954 double timeToDownload = (cueBytes * 8.0) / bps;
3955
3956 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3957 *sec_to_download += timeToDownload;
3958
3959 // Check if the search ends within the first cue.
3960 if (desc_curr.end_time_ns >= end_time_ns) {
3961 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3962 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3963 sec_downloaded = percent_to_sub * sec_downloaded;
3964 *sec_to_download = percent_to_sub * *sec_to_download;
3965 }
3966
3967 if ((sec_downloaded + *buffer) <= min_buffer) {
3968 return 1;
3969 }
3970
3971 // Get the next Cue.
3972 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3973 }
3974
3975 while (desc_curr.start_time_ns != -1) {
3976 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3977 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3978 double desc_sec = desc_ns / nano_seconds_per_second;
3979 double bits = (desc_bytes * 8.0);
3980 double time_to_download = bits / bps;
3981
3982 sec_downloaded += desc_sec - time_to_download;
3983 *sec_to_download += time_to_download;
3984
3985 if (desc_curr.end_time_ns >= end_time_ns) {
3986 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3987 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3988 sec_downloaded = percent_to_sub * sec_downloaded;
3989 *sec_to_download = percent_to_sub * *sec_to_download;
3990
3991 if ((sec_downloaded + *buffer) <= min_buffer)
3992 rv = 1;
3993 break;
3994 }
3995
3996 if ((sec_downloaded + *buffer) <= min_buffer) {
3997 rv = 1;
3998 break;
3999 }
4000
4001 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4002 }
4003 *buffer = *buffer + sec_downloaded;
4004 return rv;
4005 }
4006
4007 /* This function computes the bandwidth of the WebM file with the help of
4008 * buffer_size_after_time_downloaded() function. Both of these functions are
4009 * adapted from WebM Tools project and are adapted to work with FFmpeg's
4010 * Matroska parsing mechanism.
4011 *
4012 * Returns the bandwidth of the file on success; -1 on error.
4013 * */
webm_dash_manifest_compute_bandwidth(AVFormatContext * s,int64_t cues_start)4014 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
4015 {
4016 MatroskaDemuxContext *matroska = s->priv_data;
4017 AVStream *st = s->streams[0];
4018 double bandwidth = 0.0;
4019 int i;
4020
4021 for (i = 0; i < st->nb_index_entries; i++) {
4022 int64_t prebuffer_ns = 1000000000;
4023 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
4024 double nano_seconds_per_second = 1000000000.0;
4025 int64_t prebuffered_ns = time_ns + prebuffer_ns;
4026 double prebuffer_bytes = 0.0;
4027 int64_t temp_prebuffer_ns = prebuffer_ns;
4028 int64_t pre_bytes, pre_ns;
4029 double pre_sec, prebuffer, bits_per_second;
4030 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
4031
4032 // Start with the first Cue.
4033 CueDesc desc_end = desc_beg;
4034
4035 // Figure out how much data we have downloaded for the prebuffer. This will
4036 // be used later to adjust the bits per sample to try.
4037 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
4038 // Prebuffered the entire Cue.
4039 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
4040 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
4041 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4042 }
4043 if (desc_end.start_time_ns == -1) {
4044 // The prebuffer is larger than the duration.
4045 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
4046 return -1;
4047 bits_per_second = 0.0;
4048 } else {
4049 // The prebuffer ends in the last Cue. Estimate how much data was
4050 // prebuffered.
4051 pre_bytes = desc_end.end_offset - desc_end.start_offset;
4052 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
4053 pre_sec = pre_ns / nano_seconds_per_second;
4054 prebuffer_bytes +=
4055 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
4056
4057 prebuffer = prebuffer_ns / nano_seconds_per_second;
4058
4059 // Set this to 0.0 in case our prebuffer buffers the entire video.
4060 bits_per_second = 0.0;
4061 do {
4062 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4063 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4064 double desc_sec = desc_ns / nano_seconds_per_second;
4065 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4066
4067 // Drop the bps by the percentage of bytes buffered.
4068 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4069 double mod_bits_per_second = calc_bits_per_second * percent;
4070
4071 if (prebuffer < desc_sec) {
4072 double search_sec =
4073 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4074
4075 // Add 1 so the bits per second should be a little bit greater than file
4076 // datarate.
4077 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4078 const double min_buffer = 0.0;
4079 double buffer = prebuffer;
4080 double sec_to_download = 0.0;
4081
4082 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4083 min_buffer, &buffer, &sec_to_download,
4084 s, cues_start);
4085 if (rv < 0) {
4086 return -1;
4087 } else if (rv == 0) {
4088 bits_per_second = (double)(bps);
4089 break;
4090 }
4091 }
4092
4093 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4094 } while (desc_end.start_time_ns != -1);
4095 }
4096 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4097 }
4098 return (int64_t)bandwidth;
4099 }
4100
webm_dash_manifest_cues(AVFormatContext * s,int64_t init_range)4101 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4102 {
4103 MatroskaDemuxContext *matroska = s->priv_data;
4104 EbmlList *seekhead_list = &matroska->seekhead;
4105 MatroskaSeekhead *seekhead = seekhead_list->elem;
4106 char *buf;
4107 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4108 int i;
4109 int end = 0;
4110
4111 // determine cues start and end positions
4112 for (i = 0; i < seekhead_list->nb_elem; i++)
4113 if (seekhead[i].id == MATROSKA_ID_CUES)
4114 break;
4115
4116 if (i >= seekhead_list->nb_elem) return -1;
4117
4118 before_pos = avio_tell(matroska->ctx->pb);
4119 cues_start = seekhead[i].pos + matroska->segment_start;
4120 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4121 // cues_end is computed as cues_start + cues_length + length of the
4122 // Cues element ID (i.e. 4) + EBML length of the Cues element.
4123 // cues_end is inclusive and the above sum is reduced by 1.
4124 uint64_t cues_length, cues_id;
4125 int bytes_read;
4126 bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4127 if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4128 return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4129 bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4130 if (bytes_read < 0)
4131 return bytes_read;
4132 cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4133 }
4134 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4135 if (cues_start == -1 || cues_end == -1) return -1;
4136
4137 // parse the cues
4138 matroska_parse_cues(matroska);
4139
4140 // cues start
4141 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4142
4143 // cues end
4144 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4145
4146 // if the file has cues at the start, fix up the init range so that
4147 // it does not include it
4148 if (cues_start <= init_range)
4149 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4150
4151 // bandwidth
4152 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4153 if (bandwidth < 0) return -1;
4154 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4155
4156 // check if all clusters start with key frames
4157 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
4158
4159 // store cue point timestamps as a comma separated list for checking subsegment alignment in
4160 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4161 buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4162 if (!buf) return -1;
4163 strcpy(buf, "");
4164 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4165 int ret = snprintf(buf + end, 20,
4166 "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4167 i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4168 if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4169 av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4170 av_free(buf);
4171 return AVERROR_INVALIDDATA;
4172 }
4173 end += ret;
4174 }
4175 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS,
4176 buf, AV_DICT_DONT_STRDUP_VAL);
4177
4178 return 0;
4179 }
4180
webm_dash_manifest_read_header(AVFormatContext * s)4181 static int webm_dash_manifest_read_header(AVFormatContext *s)
4182 {
4183 char *buf;
4184 int ret = matroska_read_header(s);
4185 int64_t init_range;
4186 MatroskaTrack *tracks;
4187 MatroskaDemuxContext *matroska = s->priv_data;
4188 if (ret) {
4189 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4190 return -1;
4191 }
4192 if (!matroska->tracks.nb_elem || !s->nb_streams) {
4193 av_log(s, AV_LOG_ERROR, "No track found\n");
4194 ret = AVERROR_INVALIDDATA;
4195 goto fail;
4196 }
4197
4198 if (!matroska->is_live) {
4199 buf = av_asprintf("%g", matroska->duration);
4200 if (!buf) {
4201 ret = AVERROR(ENOMEM);
4202 goto fail;
4203 }
4204 av_dict_set(&s->streams[0]->metadata, DURATION,
4205 buf, AV_DICT_DONT_STRDUP_VAL);
4206
4207 // initialization range
4208 // 5 is the offset of Cluster ID.
4209 init_range = avio_tell(s->pb) - 5;
4210 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4211 }
4212
4213 // basename of the file
4214 buf = strrchr(s->url, '/');
4215 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4216
4217 // track number
4218 tracks = matroska->tracks.elem;
4219 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4220
4221 // parse the cues and populate Cue related fields
4222 if (!matroska->is_live) {
4223 ret = webm_dash_manifest_cues(s, init_range);
4224 if (ret < 0) {
4225 av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4226 goto fail;
4227 }
4228 }
4229
4230 // use the bandwidth from the command line if it was provided
4231 if (matroska->bandwidth > 0) {
4232 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH,
4233 matroska->bandwidth, 0);
4234 }
4235 return 0;
4236 fail:
4237 matroska_read_close(s);
4238 return ret;
4239 }
4240
webm_dash_manifest_read_packet(AVFormatContext * s,AVPacket * pkt)4241 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
4242 {
4243 return AVERROR_EOF;
4244 }
4245
4246 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4247 static const AVOption options[] = {
4248 { "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 },
4249 { "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 },
4250 { NULL },
4251 };
4252
4253 static const AVClass webm_dash_class = {
4254 .class_name = "WebM DASH Manifest demuxer",
4255 .item_name = av_default_item_name,
4256 .option = options,
4257 .version = LIBAVUTIL_VERSION_INT,
4258 };
4259
4260 AVInputFormat ff_matroska_demuxer = {
4261 .name = "matroska,webm",
4262 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4263 .extensions = "mkv,mk3d,mka,mks",
4264 .priv_data_size = sizeof(MatroskaDemuxContext),
4265 .read_probe = matroska_probe,
4266 .read_header = matroska_read_header,
4267 .read_packet = matroska_read_packet,
4268 .read_close = matroska_read_close,
4269 .read_seek = matroska_read_seek,
4270 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4271 };
4272
4273 AVInputFormat ff_webm_dash_manifest_demuxer = {
4274 .name = "webm_dash_manifest",
4275 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4276 .priv_data_size = sizeof(MatroskaDemuxContext),
4277 .read_header = webm_dash_manifest_read_header,
4278 .read_packet = webm_dash_manifest_read_packet,
4279 .read_close = matroska_read_close,
4280 .priv_class = &webm_dash_class,
4281 };
4282