1 /*
2 * Windows Television (WTV) demuxer
3 * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
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 * Windows Television (WTV) demuxer
25 * @author Peter Ross <pross@xvid.org>
26 */
27
28 #include <inttypes.h>
29
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/intfloat.h"
33 #include "libavutil/time_internal.h"
34 #include "avformat.h"
35 #include "demux.h"
36 #include "internal.h"
37 #include "wtv.h"
38 #include "mpegts.h"
39
40 /* Macros for formatting GUIDs */
41 #define PRI_PRETTY_GUID \
42 "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
43 #define ARG_PRETTY_GUID(g) \
44 AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
45 #define LEN_PRETTY_GUID 34
46
47 /*
48 * File system routines
49 */
50
51 typedef struct WtvFile {
52 AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
53
54 int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
55 uint32_t *sectors; /**< file allocation table */
56 int nb_sectors; /**< number of sectors */
57
58 int error;
59 int64_t position;
60 int64_t length;
61 } WtvFile;
62
seek_by_sector(AVIOContext * pb,int64_t sector,int64_t offset)63 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
64 {
65 return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
66 }
67
68 /**
69 * @return bytes read, AVERROR_EOF on end of file, or <0 on error
70 */
wtvfile_read_packet(void * opaque,uint8_t * buf,int buf_size)71 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
72 {
73 WtvFile *wf = opaque;
74 AVIOContext *pb = wf->pb_filesystem;
75 int nread = 0, n = 0;
76
77 if (wf->error || pb->error)
78 return -1;
79 if (wf->position >= wf->length || avio_feof(pb))
80 return AVERROR_EOF;
81
82 buf_size = FFMIN(buf_size, wf->length - wf->position);
83 while(nread < buf_size) {
84 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
85 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
86
87 n = avio_read(pb, buf, read_request);
88 if (n <= 0)
89 break;
90 nread += n;
91 buf += n;
92 wf->position += n;
93 if (n == remaining_in_sector) {
94 int i = wf->position >> wf->sector_bits;
95 if (i >= wf->nb_sectors ||
96 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
97 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
98 wf->error = 1;
99 break;
100 }
101 }
102 }
103 return nread ? nread : n;
104 }
105
106 /**
107 * @return position (or file length)
108 */
wtvfile_seek(void * opaque,int64_t offset,int whence)109 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
110 {
111 WtvFile *wf = opaque;
112 AVIOContext *pb = wf->pb_filesystem;
113
114 if (whence == AVSEEK_SIZE)
115 return wf->length;
116 else if (whence == SEEK_CUR)
117 offset = wf->position + offset;
118 else if (whence == SEEK_END)
119 offset = wf->length;
120
121 wf->error = offset < 0 || offset >= wf->length ||
122 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
123 offset & ((1 << wf->sector_bits) - 1)) < 0;
124 wf->position = offset;
125 return offset;
126 }
127
128 /**
129 * read non-zero integers (le32) from input stream
130 * @param pb
131 * @param[out] data destination
132 * @param count maximum number of integers to read
133 * @return total number of integers read
134 */
read_ints(AVIOContext * pb,uint32_t * data,int count)135 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
136 {
137 int i, total = 0;
138 for (i = 0; i < count; i++) {
139 if ((data[total] = avio_rl32(pb)))
140 total++;
141 }
142 return total;
143 }
144
145 /**
146 * Open file
147 * @param first_sector First sector
148 * @param length Length of file (bytes)
149 * @param depth File allocation table depth
150 * @return NULL on error
151 */
wtvfile_open_sector(unsigned first_sector,uint64_t length,int depth,AVFormatContext * s)152 static AVIOContext * wtvfile_open_sector(unsigned first_sector, uint64_t length, int depth, AVFormatContext *s)
153 {
154 AVIOContext *pb;
155 WtvFile *wf;
156 uint8_t *buffer;
157 int64_t size;
158
159 if (seek_by_sector(s->pb, first_sector, 0) < 0)
160 return NULL;
161
162 wf = av_mallocz(sizeof(WtvFile));
163 if (!wf)
164 return NULL;
165
166 if (depth == 0) {
167 wf->sectors = av_malloc(sizeof(uint32_t));
168 if (!wf->sectors) {
169 av_free(wf);
170 return NULL;
171 }
172 wf->sectors[0] = first_sector;
173 wf->nb_sectors = 1;
174 } else if (depth == 1) {
175 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
176 if (!wf->sectors) {
177 av_free(wf);
178 return NULL;
179 }
180 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
181 } else if (depth == 2) {
182 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
183 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
184 int i;
185
186 wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS);
187 if (!wf->sectors) {
188 av_free(wf);
189 return NULL;
190 }
191 wf->nb_sectors = 0;
192 for (i = 0; i < nb_sectors1; i++) {
193 if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
194 break;
195 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
196 }
197 } else {
198 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
199 av_free(wf);
200 return NULL;
201 }
202 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
203
204 if (!wf->nb_sectors) {
205 av_freep(&wf->sectors);
206 av_freep(&wf);
207 return NULL;
208 }
209
210 size = avio_size(s->pb);
211 if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
212 av_log(s, AV_LOG_WARNING, "truncated file\n");
213
214 /* check length */
215 length &= 0xFFFFFFFFFFFF;
216 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
217 av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
218 length = (int64_t)wf->nb_sectors << wf->sector_bits;
219 }
220 wf->length = length;
221
222 /* seek to initial sector */
223 wf->position = 0;
224 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
225 av_freep(&wf->sectors);
226 av_freep(&wf);
227 return NULL;
228 }
229
230 wf->pb_filesystem = s->pb;
231 buffer = av_malloc(1 << wf->sector_bits);
232 if (!buffer) {
233 av_freep(&wf->sectors);
234 av_freep(&wf);
235 return NULL;
236 }
237
238 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
239 wtvfile_read_packet, NULL, wtvfile_seek);
240 if (!pb) {
241 av_freep(&buffer);
242 av_freep(&wf->sectors);
243 av_freep(&wf);
244 }
245 return pb;
246 }
247
248 /**
249 * Open file using filename
250 * @param[in] buf directory buffer
251 * @param buf_size directory buffer size
252 * @param[in] filename
253 * @param filename_size size of filename
254 * @return NULL on error
255 */
wtvfile_open2(AVFormatContext * s,const uint8_t * buf,int buf_size,const uint8_t * filename,int filename_size)256 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
257 {
258 const uint8_t *buf_end = buf + buf_size;
259
260 while(buf + 48 <= buf_end) {
261 int dir_length, name_size, first_sector, depth;
262 uint64_t file_length;
263 const uint8_t *name;
264 if (ff_guidcmp(buf, ff_dir_entry_guid)) {
265 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
266 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
267 break;
268 }
269 dir_length = AV_RL16(buf + 16);
270 file_length = AV_RL64(buf + 24);
271 name_size = 2 * AV_RL32(buf + 32);
272 if (name_size < 0) {
273 av_log(s, AV_LOG_ERROR,
274 "bad filename length, remaining directory entries ignored\n");
275 break;
276 }
277 if (dir_length == 0) {
278 av_log(s, AV_LOG_ERROR,
279 "bad dir length, remaining directory entries ignored\n");
280 break;
281 }
282 if (48 + (int64_t)name_size > buf_end - buf) {
283 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
284 break;
285 }
286 first_sector = AV_RL32(buf + 40 + name_size);
287 depth = AV_RL32(buf + 44 + name_size);
288
289 /* compare file name; test optional null terminator */
290 name = buf + 40;
291 if (name_size >= filename_size &&
292 !memcmp(name, filename, filename_size) &&
293 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
294 return wtvfile_open_sector(first_sector, file_length, depth, s);
295
296 buf += dir_length;
297 }
298 return NULL;
299 }
300
301 #define wtvfile_open(s, buf, buf_size, filename) \
302 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
303
304 /**
305 * Close file opened with wtvfile_open_sector(), or wtv_open()
306 */
wtvfile_close(AVIOContext * pb)307 static void wtvfile_close(AVIOContext *pb)
308 {
309 WtvFile *wf = pb->opaque;
310 av_freep(&wf->sectors);
311 av_freep(&pb->opaque);
312 av_freep(&pb->buffer);
313 avio_context_free(&pb);
314 }
315
316 /*
317 * Main demuxer
318 */
319
320 typedef struct WtvStream {
321 int seen_data;
322 } WtvStream;
323
324 typedef struct WtvContext {
325 AVIOContext *pb; /**< timeline file */
326 int64_t epoch;
327 int64_t pts; /**< pts for next data chunk */
328 int64_t last_valid_pts; /**< latest valid pts, used for interactive seeking */
329
330 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
331 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
332 AVIndexEntry *index_entries;
333 int nb_index_entries;
334 unsigned int index_entries_allocated_size;
335 } WtvContext;
336
337 /* WTV GUIDs */
338 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
339 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
340 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
341 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
342 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
343 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
344 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
345 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
346 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
347 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
348 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
349 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
350 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
351 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
352 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
353 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
354 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
355 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
356
357 /* Windows media GUIDs */
358
359 /* Media types */
360 static const ff_asf_guid mediasubtype_mpeg1payload =
361 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
362 static const ff_asf_guid mediatype_mpeg2_sections =
363 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
364 static const ff_asf_guid mediatype_mpeg2_pes =
365 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
366 static const ff_asf_guid mediatype_mstvcaption =
367 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
368
369 /* Media subtypes */
370 static const ff_asf_guid mediasubtype_dvb_subtitle =
371 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
372 static const ff_asf_guid mediasubtype_teletext =
373 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
374 static const ff_asf_guid mediasubtype_dtvccdata =
375 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
376 static const ff_asf_guid mediasubtype_mpeg2_sections =
377 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
378
read_probe(const AVProbeData * p)379 static int read_probe(const AVProbeData *p)
380 {
381 return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
382 }
383
384 /**
385 * Convert win32 FILETIME to ISO-8601 string
386 * @return <0 on error
387 */
filetime_to_iso8601(char * buf,int buf_size,int64_t value)388 static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
389 {
390 time_t t = (value / 10000000LL) - 11644473600LL;
391 struct tm tmbuf;
392 struct tm *tm = gmtime_r(&t, &tmbuf);
393 if (!tm)
394 return -1;
395 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
396 return -1;
397 return 0;
398 }
399
400 /**
401 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
402 * @return <0 on error
403 */
crazytime_to_iso8601(char * buf,int buf_size,int64_t value)404 static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
405 {
406 time_t t = (value / 10000000LL) - 719162LL*86400LL;
407 struct tm tmbuf;
408 struct tm *tm = gmtime_r(&t, &tmbuf);
409 if (!tm)
410 return -1;
411 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
412 return -1;
413 return 0;
414 }
415
416 /**
417 * Convert OLE DATE to ISO-8601 string
418 * @return <0 on error
419 */
oledate_to_iso8601(char * buf,int buf_size,int64_t value)420 static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
421 {
422 time_t t = (av_int2double(value) - 25569.0) * 86400;
423 struct tm tmbuf;
424 struct tm *tm= gmtime_r(&t, &tmbuf);
425 if (!tm)
426 return -1;
427 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
428 return -1;
429 return 0;
430 }
431
get_attachment(AVFormatContext * s,AVIOContext * pb,int length)432 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
433 {
434 char mime[1024];
435 char description[1024];
436 unsigned int filesize;
437 AVStream *st;
438 int64_t pos = avio_tell(pb);
439
440 avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
441 if (strcmp(mime, "image/jpeg"))
442 goto done;
443
444 avio_r8(pb);
445 avio_get_str16le(pb, INT_MAX, description, sizeof(description));
446 filesize = avio_rl32(pb);
447 if (!filesize)
448 goto done;
449
450 if (ff_add_attached_pic(s, NULL, pb, NULL, filesize) < 0)
451 goto done;
452 st = s->streams[s->nb_streams - 1];
453 av_dict_set(&st->metadata, "title", description, 0);
454 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
455 st->id = -1;
456 done:
457 avio_seek(pb, pos + length, SEEK_SET);
458 }
459
get_tag(AVFormatContext * s,AVIOContext * pb,const char * key,int type,int length)460 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
461 {
462 int buf_size;
463 char *buf;
464
465 if (!strcmp(key, "WM/MediaThumbType")) {
466 avio_skip(pb, length);
467 return;
468 }
469
470 buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
471 buf = av_malloc(buf_size);
472 if (!buf)
473 return;
474
475 if (type == 0 && length == 4) {
476 snprintf(buf, buf_size, "%u", avio_rl32(pb));
477 } else if (type == 1) {
478 avio_get_str16le(pb, length, buf, buf_size);
479 if (!strlen(buf)) {
480 av_free(buf);
481 return;
482 }
483 } else if (type == 3 && length == 4) {
484 strcpy(buf, avio_rl32(pb) ? "true" : "false");
485 } else if (type == 4 && length == 8) {
486 int64_t num = avio_rl64(pb);
487 if (!strcmp(key, "WM/EncodingTime") ||
488 !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
489 if (filetime_to_iso8601(buf, buf_size, num) < 0) {
490 av_free(buf);
491 return;
492 }
493 } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
494 !strcmp(key, "WM/WMRVEndTime")) {
495 if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
496 av_free(buf);
497 return;
498 }
499 } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
500 if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
501 av_free(buf);
502 return;
503 }
504 } else if (!strcmp(key, "WM/WMRVBitrate"))
505 snprintf(buf, buf_size, "%f", av_int2double(num));
506 else
507 snprintf(buf, buf_size, "%"PRIi64, num);
508 } else if (type == 5 && length == 2) {
509 snprintf(buf, buf_size, "%u", avio_rl16(pb));
510 } else if (type == 6 && length == 16) {
511 ff_asf_guid guid;
512 avio_read(pb, guid, 16);
513 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
514 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
515 get_attachment(s, pb, length);
516 av_freep(&buf);
517 return;
518 } else {
519 av_freep(&buf);
520 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
521 avio_skip(pb, length);
522 return;
523 }
524
525 av_dict_set(&s->metadata, key, buf, 0);
526 av_freep(&buf);
527 }
528
529 /**
530 * Parse metadata entries
531 */
parse_legacy_attrib(AVFormatContext * s,AVIOContext * pb)532 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
533 {
534 ff_asf_guid guid;
535 int length, type;
536 while(!avio_feof(pb)) {
537 char key[1024];
538 ff_get_guid(pb, &guid);
539 type = avio_rl32(pb);
540 length = avio_rl32(pb);
541 if (!length)
542 break;
543 if (ff_guidcmp(&guid, ff_metadata_guid)) {
544 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
545 "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
546 break;
547 }
548 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
549 get_tag(s, pb, key, type, length);
550 }
551
552 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
553 }
554
555 /**
556 * parse VIDEOINFOHEADER2 structure
557 * @return bytes consumed
558 */
parse_videoinfoheader2(AVFormatContext * s,AVStream * st)559 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
560 {
561 WtvContext *wtv = s->priv_data;
562 AVIOContext *pb = wtv->pb;
563
564 avio_skip(pb, 72); // picture aspect ratio is unreliable
565 st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL);
566
567 return 72 + 40;
568 }
569
570 /**
571 * Parse MPEG1WAVEFORMATEX extradata structure
572 */
parse_mpeg1waveformatex(AVStream * st)573 static void parse_mpeg1waveformatex(AVStream *st)
574 {
575 /* fwHeadLayer */
576 switch (AV_RL16(st->codecpar->extradata)) {
577 case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
578 case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
579 case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
580 }
581
582 st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
583
584 /* dwHeadMode */
585 switch (AV_RL16(st->codecpar->extradata + 6)) {
586 case 1 :
587 case 2 :
588 case 4 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
589 break;
590 case 8 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
591 break;
592 }
593 }
594
595 /**
596 * Initialise stream
597 * @param st Stream to initialise, or NULL to create and initialise new stream
598 * @return NULL on error
599 */
new_stream(AVFormatContext * s,AVStream * st,int sid,int codec_type)600 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
601 {
602 if (st) {
603 if (st->codecpar->extradata) {
604 av_freep(&st->codecpar->extradata);
605 st->codecpar->extradata_size = 0;
606 }
607 } else {
608 WtvStream *wst = av_mallocz(sizeof(WtvStream));
609 if (!wst)
610 return NULL;
611 st = avformat_new_stream(s, NULL);
612 if (!st) {
613 av_free(wst);
614 return NULL;
615 }
616 st->id = sid;
617 st->priv_data = wst;
618 }
619 st->codecpar->codec_type = codec_type;
620 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
621 avpriv_set_pts_info(st, 64, 1, 10000000);
622 return st;
623 }
624
625 /**
626 * parse Media Type structure and populate stream
627 * @param st Stream, or NULL to create new stream
628 * @param mediatype Mediatype GUID
629 * @param subtype Subtype GUID
630 * @param formattype Format GUID
631 * @param size Size of format buffer
632 * @return NULL on error
633 */
parse_media_type(AVFormatContext * s,AVStream * st,int sid,ff_asf_guid mediatype,ff_asf_guid subtype,ff_asf_guid formattype,uint64_t size)634 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
635 ff_asf_guid mediatype, ff_asf_guid subtype,
636 ff_asf_guid formattype, uint64_t size)
637 {
638 WtvContext *wtv = s->priv_data;
639 AVIOContext *pb = wtv->pb;
640 if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
641 !ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
642 ff_asf_guid actual_subtype;
643 ff_asf_guid actual_formattype;
644
645 if (size < 32) {
646 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
647 avio_skip(pb, size);
648 return NULL;
649 }
650
651 avio_skip(pb, size - 32);
652 ff_get_guid(pb, &actual_subtype);
653 ff_get_guid(pb, &actual_formattype);
654 if (avio_feof(pb))
655 return NULL;
656 avio_seek(pb, -size, SEEK_CUR);
657
658 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
659 avio_skip(pb, 32);
660 return st;
661 } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
662 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
663 if (!st)
664 return NULL;
665 if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
666 int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
667 if (ret < 0)
668 return NULL;
669 } else {
670 if (ff_guidcmp(formattype, ff_format_none))
671 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
672 avio_skip(pb, size);
673 }
674
675 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
676 st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
677 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
678 if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
679 parse_mpeg1waveformatex(st);
680 else
681 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
682 } else {
683 st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
684 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
685 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
686 }
687 return st;
688 } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
689 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
690 if (!st)
691 return NULL;
692 if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
693 int consumed = parse_videoinfoheader2(s, st);
694 avio_skip(pb, FFMAX(size - consumed, 0));
695 } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
696 uint64_t consumed = parse_videoinfoheader2(s, st);
697 /* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
698 avio_skip(pb, FFMAX(size - consumed, 0));
699 } else {
700 if (ff_guidcmp(formattype, ff_format_none))
701 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
702 avio_skip(pb, size);
703 }
704
705 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
706 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
707 } else {
708 st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
709 }
710 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
711 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
712 return st;
713 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
714 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
715 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
716 if (!st)
717 return NULL;
718 if (ff_guidcmp(formattype, ff_format_none))
719 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
720 avio_skip(pb, size);
721 st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
722 return st;
723 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
724 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
725 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
726 if (!st)
727 return NULL;
728 if (ff_guidcmp(formattype, ff_format_none))
729 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
730 avio_skip(pb, size);
731 st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
732 return st;
733 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
734 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
735 if (ff_guidcmp(formattype, ff_format_none))
736 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
737 avio_skip(pb, size);
738 return NULL;
739 }
740
741 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
742 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
743 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
744 avio_skip(pb, size);
745 return NULL;
746 }
747
748 enum {
749 SEEK_TO_DATA = 0,
750 SEEK_TO_PTS,
751 };
752
753 /**
754 * Try to seek over a broken chunk
755 * @return <0 on error
756 */
recover(WtvContext * wtv,uint64_t broken_pos)757 static int recover(WtvContext *wtv, uint64_t broken_pos)
758 {
759 AVIOContext *pb = wtv->pb;
760 int i;
761 for (i = 0; i < wtv->nb_index_entries; i++) {
762 if (wtv->index_entries[i].pos > broken_pos) {
763 int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
764 if (ret < 0)
765 return ret;
766 wtv->pts = wtv->index_entries[i].timestamp;
767 return 0;
768 }
769 }
770 return AVERROR(EIO);
771 }
772
773 /**
774 * Parse WTV chunks
775 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
776 * @param seekts timestamp
777 * @param[out] len_ptr Length of data chunk
778 * @return stream index of data chunk, or <0 on error
779 */
parse_chunks(AVFormatContext * s,int mode,int64_t seekts,int * len_ptr)780 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
781 {
782 WtvContext *wtv = s->priv_data;
783 AVIOContext *pb = wtv->pb;
784 while (!avio_feof(pb)) {
785 ff_asf_guid g;
786 int len, sid, consumed;
787
788 ff_get_guid(pb, &g);
789 len = avio_rl32(pb);
790 if (len < 32 || len > INT_MAX - 7) {
791 int ret;
792 if (avio_feof(pb))
793 return AVERROR_EOF;
794 av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
795 if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
796 return ret;
797 continue;
798 }
799 sid = avio_rl32(pb) & 0x7FFF;
800 avio_skip(pb, 8);
801 consumed = 32;
802
803 if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
804 if (ff_find_stream_index(s, sid) < 0) {
805 ff_asf_guid mediatype, subtype, formattype;
806 int size;
807 avio_skip(pb, 28);
808 ff_get_guid(pb, &mediatype);
809 ff_get_guid(pb, &subtype);
810 avio_skip(pb, 12);
811 ff_get_guid(pb, &formattype);
812 size = avio_rl32(pb);
813 if (size < 0 || size > INT_MAX - 92 - consumed)
814 return AVERROR_INVALIDDATA;
815 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
816 consumed += 92 + size;
817 }
818 } else if (!ff_guidcmp(g, ff_stream2_guid)) {
819 int stream_index = ff_find_stream_index(s, sid);
820 if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
821 ff_asf_guid mediatype, subtype, formattype;
822 int size;
823 avio_skip(pb, 12);
824 ff_get_guid(pb, &mediatype);
825 ff_get_guid(pb, &subtype);
826 avio_skip(pb, 12);
827 ff_get_guid(pb, &formattype);
828 size = avio_rl32(pb);
829 if (size < 0 || size > INT_MAX - 76 - consumed)
830 return AVERROR_INVALIDDATA;
831 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
832 consumed += 76 + size;
833 }
834 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
835 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
836 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
837 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
838 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
839 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
840 int stream_index = ff_find_stream_index(s, sid);
841 if (stream_index >= 0) {
842 AVStream *st = s->streams[stream_index];
843 uint8_t buf[258];
844 const uint8_t *pbuf = buf;
845 int buf_size;
846
847 avio_skip(pb, 8);
848 consumed += 8;
849 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
850 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
851 avio_skip(pb, 6);
852 consumed += 6;
853 }
854
855 buf_size = FFMIN(len - consumed, sizeof(buf));
856 avio_read(pb, buf, buf_size);
857 consumed += buf_size;
858 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
859 }
860 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
861 int stream_index = ff_find_stream_index(s, sid);
862 if (stream_index >= 0) {
863 AVStream *st = s->streams[stream_index];
864 int audio_type;
865 avio_skip(pb, 8);
866 audio_type = avio_r8(pb);
867 if (audio_type == 2)
868 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
869 else if (audio_type == 3)
870 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
871 consumed += 9;
872 }
873 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
874 int stream_index = ff_find_stream_index(s, sid);
875 if (stream_index >= 0) {
876 avio_skip(pb, 12);
877 if (avio_rl32(pb))
878 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
879 consumed += 16;
880 }
881 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
882 int stream_index = ff_find_stream_index(s, sid);
883 if (stream_index >= 0) {
884 AVStream *st = s->streams[stream_index];
885 uint8_t language[4];
886 avio_skip(pb, 12);
887 avio_read(pb, language, 3);
888 if (language[0]) {
889 language[3] = 0;
890 av_dict_set(&st->metadata, "language", language, 0);
891 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
892 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
893 }
894 consumed += 15;
895 }
896 } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
897 int stream_index = ff_find_stream_index(s, sid);
898 if (stream_index >= 0) {
899 avio_skip(pb, 8);
900 wtv->pts = avio_rl64(pb);
901 consumed += 16;
902 if (wtv->pts == -1)
903 wtv->pts = AV_NOPTS_VALUE;
904 else {
905 wtv->last_valid_pts = wtv->pts;
906 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
907 wtv->epoch = wtv->pts;
908 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
909 avio_skip(pb, WTV_PAD8(len) - consumed);
910 return 0;
911 }
912 }
913 }
914 } else if (!ff_guidcmp(g, ff_data_guid)) {
915 int stream_index = ff_find_stream_index(s, sid);
916 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
917 WtvStream *wst = s->streams[stream_index]->priv_data;
918 wst->seen_data = 1;
919 if (len_ptr) {
920 *len_ptr = len;
921 }
922 return stream_index;
923 }
924 } else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
925 int stream_index = ff_find_stream_index(s, sid);
926 if (stream_index >= 0)
927 av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
928 } else if (
929 !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||
930 !ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
931 !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||
932 !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
933 !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||
934 !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||
935 !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||
936 !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||
937 !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||
938 !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||
939 !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||
940 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
941 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
942 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
943 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
944 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
945 !ff_guidcmp(g, ff_index_guid) ||
946 !ff_guidcmp(g, ff_sync_guid) ||
947 !ff_guidcmp(g, ff_stream1_guid) ||
948 !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
949 //ignore known guids
950 } else
951 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
952
953 if (avio_feof(pb))
954 break;
955
956 avio_skip(pb, WTV_PAD8(len) - consumed);
957 }
958 return AVERROR_EOF;
959 }
960
read_header(AVFormatContext * s)961 static int read_header(AVFormatContext *s)
962 {
963 WtvContext *wtv = s->priv_data;
964 unsigned root_sector;
965 int root_size;
966 uint8_t root[WTV_SECTOR_SIZE];
967 AVIOContext *pb;
968 int64_t timeline_pos;
969 int64_t ret;
970
971 wtv->epoch =
972 wtv->pts =
973 wtv->last_valid_pts = AV_NOPTS_VALUE;
974
975 /* read root directory sector */
976 avio_skip(s->pb, 0x30);
977 root_size = avio_rl32(s->pb);
978 if (root_size > sizeof(root)) {
979 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
980 return AVERROR_INVALIDDATA;
981 }
982 avio_skip(s->pb, 4);
983 root_sector = avio_rl32(s->pb);
984
985 ret = seek_by_sector(s->pb, root_sector, 0);
986 if (ret < 0)
987 return ret;
988 root_size = avio_read(s->pb, root, root_size);
989 if (root_size < 0)
990 return AVERROR_INVALIDDATA;
991
992 /* parse chunks up until first data chunk */
993 wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
994 if (!wtv->pb) {
995 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
996 return AVERROR_INVALIDDATA;
997 }
998
999 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
1000 if (ret < 0) {
1001 wtvfile_close(wtv->pb);
1002 return ret;
1003 }
1004 avio_seek(wtv->pb, -32, SEEK_CUR);
1005
1006 timeline_pos = avio_tell(s->pb); // save before opening another file
1007
1008 /* read metadata */
1009 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
1010 if (pb) {
1011 parse_legacy_attrib(s, pb);
1012 wtvfile_close(pb);
1013 }
1014
1015 s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv
1016
1017 /* read seek index */
1018 if (s->nb_streams) {
1019 AVStream *st = s->streams[0];
1020 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
1021 if (pb) {
1022 while(1) {
1023 uint64_t timestamp = avio_rl64(pb);
1024 uint64_t frame_nb = avio_rl64(pb);
1025 if (avio_feof(pb))
1026 break;
1027 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1028 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1029 }
1030 wtvfile_close(pb);
1031
1032 if (wtv->nb_index_entries) {
1033 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
1034 if (pb) {
1035 AVIndexEntry *e = wtv->index_entries;
1036 AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1;
1037 uint64_t last_position = 0;
1038 while (1) {
1039 uint64_t frame_nb = avio_rl64(pb);
1040 uint64_t position = avio_rl64(pb);
1041 while (e <= e_end && frame_nb > e->size) {
1042 e->pos = last_position;
1043 e++;
1044 }
1045 if (avio_feof(pb))
1046 break;
1047 last_position = position;
1048 }
1049 e_end->pos = last_position;
1050 wtvfile_close(pb);
1051 st->duration = e_end->timestamp;
1052 }
1053 }
1054 }
1055 }
1056
1057 avio_seek(s->pb, timeline_pos, SEEK_SET);
1058 return 0;
1059 }
1060
read_packet(AVFormatContext * s,AVPacket * pkt)1061 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1062 {
1063 WtvContext *wtv = s->priv_data;
1064 AVIOContext *pb = wtv->pb;
1065 int stream_index, len, ret;
1066
1067 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1068 if (stream_index < 0)
1069 return stream_index;
1070
1071 ret = av_get_packet(pb, pkt, len - 32);
1072 if (ret < 0)
1073 return ret;
1074 pkt->stream_index = stream_index;
1075 pkt->pts = wtv->pts;
1076 avio_skip(pb, WTV_PAD8(len) - len);
1077 return 0;
1078 }
1079
read_seek(AVFormatContext * s,int stream_index,int64_t ts,int flags)1080 static int read_seek(AVFormatContext *s, int stream_index,
1081 int64_t ts, int flags)
1082 {
1083 WtvContext *wtv = s->priv_data;
1084 AVIOContext *pb = wtv->pb;
1085 AVStream *st = s->streams[0];
1086 int64_t ts_relative;
1087 int i;
1088
1089 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1090 return AVERROR(ENOSYS);
1091
1092 /* timestamp adjustment is required because wtv->pts values are absolute,
1093 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1094 ts_relative = ts;
1095 if (wtv->epoch != AV_NOPTS_VALUE)
1096 ts_relative -= wtv->epoch;
1097
1098 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1099 if (i < 0) {
1100 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1101 if (avio_seek(pb, 0, SEEK_SET) < 0)
1102 return -1;
1103 } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1104 if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1105 return -1;
1106 }
1107 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1108 return AVERROR(ERANGE);
1109 return 0;
1110 }
1111 if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1112 return -1;
1113 wtv->pts = wtv->index_entries[i].timestamp;
1114 if (wtv->epoch != AV_NOPTS_VALUE)
1115 wtv->pts += wtv->epoch;
1116 wtv->last_valid_pts = wtv->pts;
1117 return 0;
1118 }
1119
read_close(AVFormatContext * s)1120 static int read_close(AVFormatContext *s)
1121 {
1122 WtvContext *wtv = s->priv_data;
1123 av_freep(&wtv->index_entries);
1124 wtvfile_close(wtv->pb);
1125 return 0;
1126 }
1127
1128 const AVInputFormat ff_wtv_demuxer = {
1129 .name = "wtv",
1130 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1131 .priv_data_size = sizeof(WtvContext),
1132 .read_probe = read_probe,
1133 .read_header = read_header,
1134 .read_packet = read_packet,
1135 .read_seek = read_seek,
1136 .read_close = read_close,
1137 .flags = AVFMT_SHOW_IDS,
1138 };
1139