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 "internal.h"
36 #include "wtv.h"
37 #include "mpegts.h"
38
39 /* Macros for formatting GUIDs */
40 #define PRI_PRETTY_GUID \
41 "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
42 #define ARG_PRETTY_GUID(g) \
43 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]
44 #define LEN_PRETTY_GUID 34
45
46 /*
47 * File system routines
48 */
49
50 typedef struct WtvFile {
51 AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
52
53 int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
54 uint32_t *sectors; /**< file allocation table */
55 int nb_sectors; /**< number of sectors */
56
57 int error;
58 int64_t position;
59 int64_t length;
60 } WtvFile;
61
seek_by_sector(AVIOContext * pb,int64_t sector,int64_t offset)62 static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
63 {
64 return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
65 }
66
67 /**
68 * @return bytes read, AVERROR_EOF on end of file, or <0 on error
69 */
wtvfile_read_packet(void * opaque,uint8_t * buf,int buf_size)70 static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
71 {
72 WtvFile *wf = opaque;
73 AVIOContext *pb = wf->pb_filesystem;
74 int nread = 0, n = 0;
75
76 if (wf->error || pb->error)
77 return -1;
78 if (wf->position >= wf->length || avio_feof(pb))
79 return AVERROR_EOF;
80
81 buf_size = FFMIN(buf_size, wf->length - wf->position);
82 while(nread < buf_size) {
83 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
84 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
85
86 n = avio_read(pb, buf, read_request);
87 if (n <= 0)
88 break;
89 nread += n;
90 buf += n;
91 wf->position += n;
92 if (n == remaining_in_sector) {
93 int i = wf->position >> wf->sector_bits;
94 if (i >= wf->nb_sectors ||
95 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
96 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
97 wf->error = 1;
98 break;
99 }
100 }
101 }
102 return nread ? nread : n;
103 }
104
105 /**
106 * @return position (or file length)
107 */
wtvfile_seek(void * opaque,int64_t offset,int whence)108 static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
109 {
110 WtvFile *wf = opaque;
111 AVIOContext *pb = wf->pb_filesystem;
112
113 if (whence == AVSEEK_SIZE)
114 return wf->length;
115 else if (whence == SEEK_CUR)
116 offset = wf->position + offset;
117 else if (whence == SEEK_END)
118 offset = wf->length;
119
120 wf->error = offset < 0 || offset >= wf->length ||
121 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
122 offset & ((1 << wf->sector_bits) - 1)) < 0;
123 wf->position = offset;
124 return offset;
125 }
126
127 /**
128 * read non-zero integers (le32) from input stream
129 * @param pb
130 * @param[out] data destination
131 * @param count maximum number of integers to read
132 * @return total number of integers read
133 */
read_ints(AVIOContext * pb,uint32_t * data,int count)134 static int read_ints(AVIOContext *pb, uint32_t *data, int count)
135 {
136 int i, total = 0;
137 for (i = 0; i < count; i++) {
138 if ((data[total] = avio_rl32(pb)))
139 total++;
140 }
141 return total;
142 }
143
144 /**
145 * Open file
146 * @param first_sector First sector
147 * @param length Length of file (bytes)
148 * @param depth File allocation table depth
149 * @return NULL on error
150 */
wtvfile_open_sector(unsigned first_sector,uint64_t length,int depth,AVFormatContext * s)151 static AVIOContext * wtvfile_open_sector(unsigned first_sector, uint64_t length, int depth, AVFormatContext *s)
152 {
153 AVIOContext *pb;
154 WtvFile *wf;
155 uint8_t *buffer;
156 int64_t size;
157
158 if (seek_by_sector(s->pb, first_sector, 0) < 0)
159 return NULL;
160
161 wf = av_mallocz(sizeof(WtvFile));
162 if (!wf)
163 return NULL;
164
165 if (depth == 0) {
166 wf->sectors = av_malloc(sizeof(uint32_t));
167 if (!wf->sectors) {
168 av_free(wf);
169 return NULL;
170 }
171 wf->sectors[0] = first_sector;
172 wf->nb_sectors = 1;
173 } else if (depth == 1) {
174 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
175 if (!wf->sectors) {
176 av_free(wf);
177 return NULL;
178 }
179 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
180 } else if (depth == 2) {
181 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
182 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
183 int i;
184
185 wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS);
186 if (!wf->sectors) {
187 av_free(wf);
188 return NULL;
189 }
190 wf->nb_sectors = 0;
191 for (i = 0; i < nb_sectors1; i++) {
192 if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
193 break;
194 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
195 }
196 } else {
197 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
198 av_free(wf);
199 return NULL;
200 }
201 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
202
203 if (!wf->nb_sectors) {
204 av_freep(&wf->sectors);
205 av_freep(&wf);
206 return NULL;
207 }
208
209 size = avio_size(s->pb);
210 if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
211 av_log(s, AV_LOG_WARNING, "truncated file\n");
212
213 /* check length */
214 length &= 0xFFFFFFFFFFFF;
215 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
216 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);
217 length = (int64_t)wf->nb_sectors << wf->sector_bits;
218 }
219 wf->length = length;
220
221 /* seek to initial sector */
222 wf->position = 0;
223 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
224 av_freep(&wf->sectors);
225 av_freep(&wf);
226 return NULL;
227 }
228
229 wf->pb_filesystem = s->pb;
230 buffer = av_malloc(1 << wf->sector_bits);
231 if (!buffer) {
232 av_freep(&wf->sectors);
233 av_freep(&wf);
234 return NULL;
235 }
236
237 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
238 wtvfile_read_packet, NULL, wtvfile_seek);
239 if (!pb) {
240 av_freep(&buffer);
241 av_freep(&wf->sectors);
242 av_freep(&wf);
243 }
244 return pb;
245 }
246
247 /**
248 * Open file using filename
249 * @param[in] buf directory buffer
250 * @param buf_size directory buffer size
251 * @param[in] filename
252 * @param filename_size size of filename
253 * @return NULL on error
254 */
wtvfile_open2(AVFormatContext * s,const uint8_t * buf,int buf_size,const uint8_t * filename,int filename_size)255 static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
256 {
257 const uint8_t *buf_end = buf + buf_size;
258
259 while(buf + 48 <= buf_end) {
260 int dir_length, name_size, first_sector, depth;
261 uint64_t file_length;
262 const uint8_t *name;
263 if (ff_guidcmp(buf, ff_dir_entry_guid)) {
264 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
265 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
266 break;
267 }
268 dir_length = AV_RL16(buf + 16);
269 file_length = AV_RL64(buf + 24);
270 name_size = 2 * AV_RL32(buf + 32);
271 if (name_size < 0) {
272 av_log(s, AV_LOG_ERROR,
273 "bad filename length, remaining directory entries ignored\n");
274 break;
275 }
276 if (dir_length == 0) {
277 av_log(s, AV_LOG_ERROR,
278 "bad dir length, remaining directory entries ignored\n");
279 break;
280 }
281 if (48 + (int64_t)name_size > buf_end - buf) {
282 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
283 break;
284 }
285 first_sector = AV_RL32(buf + 40 + name_size);
286 depth = AV_RL32(buf + 44 + name_size);
287
288 /* compare file name; test optional null terminator */
289 name = buf + 40;
290 if (name_size >= filename_size &&
291 !memcmp(name, filename, filename_size) &&
292 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
293 return wtvfile_open_sector(first_sector, file_length, depth, s);
294
295 buf += dir_length;
296 }
297 return NULL;
298 }
299
300 #define wtvfile_open(s, buf, buf_size, filename) \
301 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
302
303 /**
304 * Close file opened with wtvfile_open_sector(), or wtv_open()
305 */
wtvfile_close(AVIOContext * pb)306 static void wtvfile_close(AVIOContext *pb)
307 {
308 WtvFile *wf = pb->opaque;
309 av_freep(&wf->sectors);
310 av_freep(&pb->opaque);
311 av_freep(&pb->buffer);
312 avio_context_free(&pb);
313 }
314
315 /*
316 * Main demuxer
317 */
318
319 typedef struct WtvStream {
320 int seen_data;
321 } WtvStream;
322
323 typedef struct WtvContext {
324 AVIOContext *pb; /**< timeline file */
325 int64_t epoch;
326 int64_t pts; /**< pts for next data chunk */
327 int64_t last_valid_pts; /**< latest valid pts, used for interactive seeking */
328
329 /* maintain private seek index, as the AVIndexEntry->pos is relative to the
330 start of the 'timeline' file, not the file system (AVFormatContext->pb) */
331 AVIndexEntry *index_entries;
332 int nb_index_entries;
333 unsigned int index_entries_allocated_size;
334 } WtvContext;
335
336 /* WTV GUIDs */
337 static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
338 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
339 static const ff_asf_guid EVENTID_LanguageSpanningEvent =
340 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
341 static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
342 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
343 static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
344 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
345 static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
346 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
347 static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
348 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
349 static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
350 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
351 static const ff_asf_guid EVENTID_TeletextSpanningEvent =
352 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
353 static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
354 {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
355
356 /* Windows media GUIDs */
357
358 /* Media types */
359 static const ff_asf_guid mediasubtype_mpeg1payload =
360 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
361 static const ff_asf_guid mediatype_mpeg2_sections =
362 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
363 static const ff_asf_guid mediatype_mpeg2_pes =
364 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
365 static const ff_asf_guid mediatype_mstvcaption =
366 {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
367
368 /* Media subtypes */
369 static const ff_asf_guid mediasubtype_dvb_subtitle =
370 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
371 static const ff_asf_guid mediasubtype_teletext =
372 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
373 static const ff_asf_guid mediasubtype_dtvccdata =
374 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
375 static const ff_asf_guid mediasubtype_mpeg2_sections =
376 {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
377
read_probe(const AVProbeData * p)378 static int read_probe(const AVProbeData *p)
379 {
380 return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
381 }
382
383 /**
384 * Convert win32 FILETIME to ISO-8601 string
385 * @return <0 on error
386 */
filetime_to_iso8601(char * buf,int buf_size,int64_t value)387 static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
388 {
389 time_t t = (value / 10000000LL) - 11644473600LL;
390 struct tm tmbuf;
391 struct tm *tm = gmtime_r(&t, &tmbuf);
392 if (!tm)
393 return -1;
394 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
395 return -1;
396 return 0;
397 }
398
399 /**
400 * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
401 * @return <0 on error
402 */
crazytime_to_iso8601(char * buf,int buf_size,int64_t value)403 static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
404 {
405 time_t t = (value / 10000000LL) - 719162LL*86400LL;
406 struct tm tmbuf;
407 struct tm *tm = gmtime_r(&t, &tmbuf);
408 if (!tm)
409 return -1;
410 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
411 return -1;
412 return 0;
413 }
414
415 /**
416 * Convert OLE DATE to ISO-8601 string
417 * @return <0 on error
418 */
oledate_to_iso8601(char * buf,int buf_size,int64_t value)419 static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
420 {
421 time_t t = (av_int2double(value) - 25569.0) * 86400;
422 struct tm tmbuf;
423 struct tm *tm= gmtime_r(&t, &tmbuf);
424 if (!tm)
425 return -1;
426 if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
427 return -1;
428 return 0;
429 }
430
get_attachment(AVFormatContext * s,AVIOContext * pb,int length)431 static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
432 {
433 char mime[1024];
434 char description[1024];
435 unsigned int filesize;
436 AVStream *st;
437 int ret;
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 st = avformat_new_stream(s, NULL);
451 if (!st)
452 goto done;
453 av_dict_set(&st->metadata, "title", description, 0);
454 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
455 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
456 st->id = -1;
457 ret = av_get_packet(pb, &st->attached_pic, filesize);
458 if (ret < 0)
459 goto done;
460 st->attached_pic.stream_index = st->index;
461 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
462 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
463 done:
464 avio_seek(pb, pos + length, SEEK_SET);
465 }
466
get_tag(AVFormatContext * s,AVIOContext * pb,const char * key,int type,int length)467 static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
468 {
469 int buf_size;
470 char *buf;
471
472 if (!strcmp(key, "WM/MediaThumbType")) {
473 avio_skip(pb, length);
474 return;
475 }
476
477 buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
478 buf = av_malloc(buf_size);
479 if (!buf)
480 return;
481
482 if (type == 0 && length == 4) {
483 snprintf(buf, buf_size, "%u", avio_rl32(pb));
484 } else if (type == 1) {
485 avio_get_str16le(pb, length, buf, buf_size);
486 if (!strlen(buf)) {
487 av_free(buf);
488 return;
489 }
490 } else if (type == 3 && length == 4) {
491 strcpy(buf, avio_rl32(pb) ? "true" : "false");
492 } else if (type == 4 && length == 8) {
493 int64_t num = avio_rl64(pb);
494 if (!strcmp(key, "WM/EncodingTime") ||
495 !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
496 if (filetime_to_iso8601(buf, buf_size, num) < 0) {
497 av_free(buf);
498 return;
499 }
500 } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
501 !strcmp(key, "WM/WMRVEndTime")) {
502 if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
503 av_free(buf);
504 return;
505 }
506 } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
507 if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
508 av_free(buf);
509 return;
510 }
511 } else if (!strcmp(key, "WM/WMRVBitrate"))
512 snprintf(buf, buf_size, "%f", av_int2double(num));
513 else
514 snprintf(buf, buf_size, "%"PRIi64, num);
515 } else if (type == 5 && length == 2) {
516 snprintf(buf, buf_size, "%u", avio_rl16(pb));
517 } else if (type == 6 && length == 16) {
518 ff_asf_guid guid;
519 avio_read(pb, guid, 16);
520 snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
521 } else if (type == 2 && !strcmp(key, "WM/Picture")) {
522 get_attachment(s, pb, length);
523 av_freep(&buf);
524 return;
525 } else {
526 av_freep(&buf);
527 av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
528 avio_skip(pb, length);
529 return;
530 }
531
532 av_dict_set(&s->metadata, key, buf, 0);
533 av_freep(&buf);
534 }
535
536 /**
537 * Parse metadata entries
538 */
parse_legacy_attrib(AVFormatContext * s,AVIOContext * pb)539 static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
540 {
541 ff_asf_guid guid;
542 int length, type;
543 while(!avio_feof(pb)) {
544 char key[1024];
545 ff_get_guid(pb, &guid);
546 type = avio_rl32(pb);
547 length = avio_rl32(pb);
548 if (!length)
549 break;
550 if (ff_guidcmp(&guid, ff_metadata_guid)) {
551 av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
552 "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
553 break;
554 }
555 avio_get_str16le(pb, INT_MAX, key, sizeof(key));
556 get_tag(s, pb, key, type, length);
557 }
558
559 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
560 }
561
562 /**
563 * parse VIDEOINFOHEADER2 structure
564 * @return bytes consumed
565 */
parse_videoinfoheader2(AVFormatContext * s,AVStream * st)566 static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
567 {
568 WtvContext *wtv = s->priv_data;
569 AVIOContext *pb = wtv->pb;
570
571 avio_skip(pb, 72); // picture aspect ratio is unreliable
572 st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL);
573
574 return 72 + 40;
575 }
576
577 /**
578 * Parse MPEG1WAVEFORMATEX extradata structure
579 */
parse_mpeg1waveformatex(AVStream * st)580 static void parse_mpeg1waveformatex(AVStream *st)
581 {
582 /* fwHeadLayer */
583 switch (AV_RL16(st->codecpar->extradata)) {
584 case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
585 case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
586 case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
587 }
588
589 st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
590
591 /* dwHeadMode */
592 switch (AV_RL16(st->codecpar->extradata + 6)) {
593 case 1 :
594 case 2 :
595 case 4 : st->codecpar->channels = 2;
596 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
597 break;
598 case 8 : st->codecpar->channels = 1;
599 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
600 break;
601 }
602 }
603
604 /**
605 * Initialise stream
606 * @param st Stream to initialise, or NULL to create and initialise new stream
607 * @return NULL on error
608 */
new_stream(AVFormatContext * s,AVStream * st,int sid,int codec_type)609 static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
610 {
611 if (st) {
612 if (st->codecpar->extradata) {
613 av_freep(&st->codecpar->extradata);
614 st->codecpar->extradata_size = 0;
615 }
616 } else {
617 WtvStream *wst = av_mallocz(sizeof(WtvStream));
618 if (!wst)
619 return NULL;
620 st = avformat_new_stream(s, NULL);
621 if (!st) {
622 av_free(wst);
623 return NULL;
624 }
625 st->id = sid;
626 st->priv_data = wst;
627 }
628 st->codecpar->codec_type = codec_type;
629 st->need_parsing = AVSTREAM_PARSE_FULL;
630 avpriv_set_pts_info(st, 64, 1, 10000000);
631 return st;
632 }
633
634 /**
635 * parse Media Type structure and populate stream
636 * @param st Stream, or NULL to create new stream
637 * @param mediatype Mediatype GUID
638 * @param subtype Subtype GUID
639 * @param formattype Format GUID
640 * @param size Size of format buffer
641 * @return NULL on error
642 */
parse_media_type(AVFormatContext * s,AVStream * st,int sid,ff_asf_guid mediatype,ff_asf_guid subtype,ff_asf_guid formattype,uint64_t size)643 static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
644 ff_asf_guid mediatype, ff_asf_guid subtype,
645 ff_asf_guid formattype, uint64_t size)
646 {
647 WtvContext *wtv = s->priv_data;
648 AVIOContext *pb = wtv->pb;
649 if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
650 !ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
651 ff_asf_guid actual_subtype;
652 ff_asf_guid actual_formattype;
653
654 if (size < 32) {
655 av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
656 avio_skip(pb, size);
657 return NULL;
658 }
659
660 avio_skip(pb, size - 32);
661 ff_get_guid(pb, &actual_subtype);
662 ff_get_guid(pb, &actual_formattype);
663 if (avio_feof(pb))
664 return NULL;
665 avio_seek(pb, -size, SEEK_CUR);
666
667 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
668 avio_skip(pb, 32);
669 return st;
670 } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
671 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
672 if (!st)
673 return NULL;
674 if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
675 int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
676 if (ret < 0)
677 return NULL;
678 } else {
679 if (ff_guidcmp(formattype, ff_format_none))
680 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
681 avio_skip(pb, size);
682 }
683
684 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
685 st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
686 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
687 if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
688 parse_mpeg1waveformatex(st);
689 else
690 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
691 } else {
692 st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
693 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
694 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
695 }
696 return st;
697 } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
698 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
699 if (!st)
700 return NULL;
701 if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
702 int consumed = parse_videoinfoheader2(s, st);
703 avio_skip(pb, FFMAX(size - consumed, 0));
704 } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
705 uint64_t consumed = parse_videoinfoheader2(s, st);
706 /* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
707 avio_skip(pb, FFMAX(size - consumed, 0));
708 } else {
709 if (ff_guidcmp(formattype, ff_format_none))
710 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
711 avio_skip(pb, size);
712 }
713
714 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
715 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
716 } else {
717 st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
718 }
719 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
720 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
721 return st;
722 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
723 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
724 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
725 if (!st)
726 return NULL;
727 if (ff_guidcmp(formattype, ff_format_none))
728 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
729 avio_skip(pb, size);
730 st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
731 return st;
732 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
733 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
734 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
735 if (!st)
736 return NULL;
737 if (ff_guidcmp(formattype, ff_format_none))
738 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
739 avio_skip(pb, size);
740 st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
741 return st;
742 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
743 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
744 if (ff_guidcmp(formattype, ff_format_none))
745 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
746 avio_skip(pb, size);
747 return NULL;
748 }
749
750 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
751 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
752 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
753 avio_skip(pb, size);
754 return NULL;
755 }
756
757 enum {
758 SEEK_TO_DATA = 0,
759 SEEK_TO_PTS,
760 };
761
762 /**
763 * Try to seek over a broken chunk
764 * @return <0 on error
765 */
recover(WtvContext * wtv,uint64_t broken_pos)766 static int recover(WtvContext *wtv, uint64_t broken_pos)
767 {
768 AVIOContext *pb = wtv->pb;
769 int i;
770 for (i = 0; i < wtv->nb_index_entries; i++) {
771 if (wtv->index_entries[i].pos > broken_pos) {
772 int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
773 if (ret < 0)
774 return ret;
775 wtv->pts = wtv->index_entries[i].timestamp;
776 return 0;
777 }
778 }
779 return AVERROR(EIO);
780 }
781
782 /**
783 * Parse WTV chunks
784 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
785 * @param seekts timestamp
786 * @param[out] len_ptr Length of data chunk
787 * @return stream index of data chunk, or <0 on error
788 */
parse_chunks(AVFormatContext * s,int mode,int64_t seekts,int * len_ptr)789 static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
790 {
791 WtvContext *wtv = s->priv_data;
792 AVIOContext *pb = wtv->pb;
793 while (!avio_feof(pb)) {
794 ff_asf_guid g;
795 int len, sid, consumed;
796
797 ff_get_guid(pb, &g);
798 len = avio_rl32(pb);
799 if (len < 32 || len > INT_MAX - 7) {
800 int ret;
801 if (avio_feof(pb))
802 return AVERROR_EOF;
803 av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
804 if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
805 return ret;
806 continue;
807 }
808 sid = avio_rl32(pb) & 0x7FFF;
809 avio_skip(pb, 8);
810 consumed = 32;
811
812 if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
813 if (ff_find_stream_index(s, sid) < 0) {
814 ff_asf_guid mediatype, subtype, formattype;
815 int size;
816 avio_skip(pb, 28);
817 ff_get_guid(pb, &mediatype);
818 ff_get_guid(pb, &subtype);
819 avio_skip(pb, 12);
820 ff_get_guid(pb, &formattype);
821 size = avio_rl32(pb);
822 if (size < 0 || size > INT_MAX - 92 - consumed)
823 return AVERROR_INVALIDDATA;
824 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
825 consumed += 92 + size;
826 }
827 } else if (!ff_guidcmp(g, ff_stream2_guid)) {
828 int stream_index = ff_find_stream_index(s, sid);
829 if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
830 ff_asf_guid mediatype, subtype, formattype;
831 int size;
832 avio_skip(pb, 12);
833 ff_get_guid(pb, &mediatype);
834 ff_get_guid(pb, &subtype);
835 avio_skip(pb, 12);
836 ff_get_guid(pb, &formattype);
837 size = avio_rl32(pb);
838 if (size < 0 || size > INT_MAX - 76 - consumed)
839 return AVERROR_INVALIDDATA;
840 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
841 consumed += 76 + size;
842 }
843 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
844 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
845 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
846 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
847 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
848 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
849 int stream_index = ff_find_stream_index(s, sid);
850 if (stream_index >= 0) {
851 AVStream *st = s->streams[stream_index];
852 uint8_t buf[258];
853 const uint8_t *pbuf = buf;
854 int buf_size;
855
856 avio_skip(pb, 8);
857 consumed += 8;
858 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
859 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
860 avio_skip(pb, 6);
861 consumed += 6;
862 }
863
864 buf_size = FFMIN(len - consumed, sizeof(buf));
865 avio_read(pb, buf, buf_size);
866 consumed += buf_size;
867 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
868 }
869 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
870 int stream_index = ff_find_stream_index(s, sid);
871 if (stream_index >= 0) {
872 AVStream *st = s->streams[stream_index];
873 int audio_type;
874 avio_skip(pb, 8);
875 audio_type = avio_r8(pb);
876 if (audio_type == 2)
877 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
878 else if (audio_type == 3)
879 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
880 consumed += 9;
881 }
882 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
883 int stream_index = ff_find_stream_index(s, sid);
884 if (stream_index >= 0) {
885 avio_skip(pb, 12);
886 if (avio_rl32(pb))
887 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
888 consumed += 16;
889 }
890 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
891 int stream_index = ff_find_stream_index(s, sid);
892 if (stream_index >= 0) {
893 AVStream *st = s->streams[stream_index];
894 uint8_t language[4];
895 avio_skip(pb, 12);
896 avio_read(pb, language, 3);
897 if (language[0]) {
898 language[3] = 0;
899 av_dict_set(&st->metadata, "language", language, 0);
900 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
901 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
902 }
903 consumed += 15;
904 }
905 } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
906 int stream_index = ff_find_stream_index(s, sid);
907 if (stream_index >= 0) {
908 avio_skip(pb, 8);
909 wtv->pts = avio_rl64(pb);
910 consumed += 16;
911 if (wtv->pts == -1)
912 wtv->pts = AV_NOPTS_VALUE;
913 else {
914 wtv->last_valid_pts = wtv->pts;
915 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
916 wtv->epoch = wtv->pts;
917 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
918 avio_skip(pb, WTV_PAD8(len) - consumed);
919 return 0;
920 }
921 }
922 }
923 } else if (!ff_guidcmp(g, ff_data_guid)) {
924 int stream_index = ff_find_stream_index(s, sid);
925 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
926 WtvStream *wst = s->streams[stream_index]->priv_data;
927 wst->seen_data = 1;
928 if (len_ptr) {
929 *len_ptr = len;
930 }
931 return stream_index;
932 }
933 } 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})) {
934 int stream_index = ff_find_stream_index(s, sid);
935 if (stream_index >= 0)
936 av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
937 } else if (
938 !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}) ||
939 !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}) ||
940 !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}) ||
941 !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
942 !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}) ||
943 !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}) ||
944 !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}) ||
945 !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}) ||
946 !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}) ||
947 !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}) ||
948 !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}) ||
949 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
950 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
951 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
952 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
953 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
954 !ff_guidcmp(g, ff_index_guid) ||
955 !ff_guidcmp(g, ff_sync_guid) ||
956 !ff_guidcmp(g, ff_stream1_guid) ||
957 !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
958 //ignore known guids
959 } else
960 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
961
962 if (avio_feof(pb))
963 break;
964
965 avio_skip(pb, WTV_PAD8(len) - consumed);
966 }
967 return AVERROR_EOF;
968 }
969
read_header(AVFormatContext * s)970 static int read_header(AVFormatContext *s)
971 {
972 WtvContext *wtv = s->priv_data;
973 unsigned root_sector;
974 int root_size;
975 uint8_t root[WTV_SECTOR_SIZE];
976 AVIOContext *pb;
977 int64_t timeline_pos;
978 int64_t ret;
979
980 wtv->epoch =
981 wtv->pts =
982 wtv->last_valid_pts = AV_NOPTS_VALUE;
983
984 /* read root directory sector */
985 avio_skip(s->pb, 0x30);
986 root_size = avio_rl32(s->pb);
987 if (root_size > sizeof(root)) {
988 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
989 return AVERROR_INVALIDDATA;
990 }
991 avio_skip(s->pb, 4);
992 root_sector = avio_rl32(s->pb);
993
994 ret = seek_by_sector(s->pb, root_sector, 0);
995 if (ret < 0)
996 return ret;
997 root_size = avio_read(s->pb, root, root_size);
998 if (root_size < 0)
999 return AVERROR_INVALIDDATA;
1000
1001 /* parse chunks up until first data chunk */
1002 wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
1003 if (!wtv->pb) {
1004 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
1005 return AVERROR_INVALIDDATA;
1006 }
1007
1008 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
1009 if (ret < 0) {
1010 wtvfile_close(wtv->pb);
1011 return ret;
1012 }
1013 avio_seek(wtv->pb, -32, SEEK_CUR);
1014
1015 timeline_pos = avio_tell(s->pb); // save before opening another file
1016
1017 /* read metadata */
1018 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
1019 if (pb) {
1020 parse_legacy_attrib(s, pb);
1021 wtvfile_close(pb);
1022 }
1023
1024 s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv
1025
1026 /* read seek index */
1027 if (s->nb_streams) {
1028 AVStream *st = s->streams[0];
1029 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
1030 if (pb) {
1031 while(1) {
1032 uint64_t timestamp = avio_rl64(pb);
1033 uint64_t frame_nb = avio_rl64(pb);
1034 if (avio_feof(pb))
1035 break;
1036 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1037 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1038 }
1039 wtvfile_close(pb);
1040
1041 if (wtv->nb_index_entries) {
1042 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
1043 if (pb) {
1044 AVIndexEntry *e = wtv->index_entries;
1045 AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1;
1046 uint64_t last_position = 0;
1047 while (1) {
1048 uint64_t frame_nb = avio_rl64(pb);
1049 uint64_t position = avio_rl64(pb);
1050 while (e <= e_end && frame_nb > e->size) {
1051 e->pos = last_position;
1052 e++;
1053 }
1054 if (avio_feof(pb))
1055 break;
1056 last_position = position;
1057 }
1058 e_end->pos = last_position;
1059 wtvfile_close(pb);
1060 st->duration = e_end->timestamp;
1061 }
1062 }
1063 }
1064 }
1065
1066 avio_seek(s->pb, timeline_pos, SEEK_SET);
1067 return 0;
1068 }
1069
read_packet(AVFormatContext * s,AVPacket * pkt)1070 static int read_packet(AVFormatContext *s, AVPacket *pkt)
1071 {
1072 WtvContext *wtv = s->priv_data;
1073 AVIOContext *pb = wtv->pb;
1074 int stream_index, len, ret;
1075
1076 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1077 if (stream_index < 0)
1078 return stream_index;
1079
1080 ret = av_get_packet(pb, pkt, len - 32);
1081 if (ret < 0)
1082 return ret;
1083 pkt->stream_index = stream_index;
1084 pkt->pts = wtv->pts;
1085 avio_skip(pb, WTV_PAD8(len) - len);
1086 return 0;
1087 }
1088
read_seek(AVFormatContext * s,int stream_index,int64_t ts,int flags)1089 static int read_seek(AVFormatContext *s, int stream_index,
1090 int64_t ts, int flags)
1091 {
1092 WtvContext *wtv = s->priv_data;
1093 AVIOContext *pb = wtv->pb;
1094 AVStream *st = s->streams[0];
1095 int64_t ts_relative;
1096 int i;
1097
1098 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1099 return AVERROR(ENOSYS);
1100
1101 /* timestamp adjustment is required because wtv->pts values are absolute,
1102 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1103 ts_relative = ts;
1104 if (wtv->epoch != AV_NOPTS_VALUE)
1105 ts_relative -= wtv->epoch;
1106
1107 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1108 if (i < 0) {
1109 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1110 if (avio_seek(pb, 0, SEEK_SET) < 0)
1111 return -1;
1112 } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1113 if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1114 return -1;
1115 }
1116 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1117 return AVERROR(ERANGE);
1118 return 0;
1119 }
1120 if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1121 return -1;
1122 wtv->pts = wtv->index_entries[i].timestamp;
1123 if (wtv->epoch != AV_NOPTS_VALUE)
1124 wtv->pts += wtv->epoch;
1125 wtv->last_valid_pts = wtv->pts;
1126 return 0;
1127 }
1128
read_close(AVFormatContext * s)1129 static int read_close(AVFormatContext *s)
1130 {
1131 WtvContext *wtv = s->priv_data;
1132 av_freep(&wtv->index_entries);
1133 wtvfile_close(wtv->pb);
1134 return 0;
1135 }
1136
1137 AVInputFormat ff_wtv_demuxer = {
1138 .name = "wtv",
1139 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1140 .priv_data_size = sizeof(WtvContext),
1141 .read_probe = read_probe,
1142 .read_header = read_header,
1143 .read_packet = read_packet,
1144 .read_seek = read_seek,
1145 .read_close = read_close,
1146 .flags = AVFMT_SHOW_IDS,
1147 };
1148