Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / wtvdec.c
... / ...
CommitLineData
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 formating 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 *
48 * File system routines
49 *
50 */
51
52typedef struct {
53 AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
54
55 int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
56 uint32_t *sectors; /**< file allocation table */
57 int nb_sectors; /**< number of sectors */
58
59 int error;
60 int64_t position;
61 int64_t length;
62} WtvFile;
63
64static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
65{
66 return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
67}
68
69/**
70 * @return bytes read, 0 on end of file, or <0 on error
71 */
72static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
73{
74 WtvFile *wf = opaque;
75 AVIOContext *pb = wf->pb_filesystem;
76 int nread = 0;
77
78 if (wf->error || pb->error)
79 return -1;
80 if (wf->position >= wf->length || avio_feof(pb))
81 return 0;
82
83 buf_size = FFMIN(buf_size, wf->length - wf->position);
84 while(nread < buf_size) {
85 int n;
86 int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
87 int read_request = FFMIN(buf_size - nread, remaining_in_sector);
88
89 n = avio_read(pb, buf, read_request);
90 if (n <= 0)
91 break;
92 nread += n;
93 buf += n;
94 wf->position += n;
95 if (n == remaining_in_sector) {
96 int i = wf->position >> wf->sector_bits;
97 if (i >= wf->nb_sectors ||
98 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
99 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
100 wf->error = 1;
101 break;
102 }
103 }
104 }
105 return nread;
106}
107
108/**
109 * @return position (or file length)
110 */
111static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
112{
113 WtvFile *wf = opaque;
114 AVIOContext *pb = wf->pb_filesystem;
115
116 if (whence == AVSEEK_SIZE)
117 return wf->length;
118 else if (whence == SEEK_CUR)
119 offset = wf->position + offset;
120 else if (whence == SEEK_END)
121 offset = wf->length;
122
123 wf->error = offset < 0 || offset >= wf->length ||
124 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
125 offset & ((1 << wf->sector_bits) - 1)) < 0;
126 wf->position = offset;
127 return offset;
128}
129
130/**
131 * read non-zero integers (le32) from input stream
132 * @param pb
133 * @param[out] data destination
134 * @param count maximum number of integers to read
135 * @return total number of integers read
136 */
137static int read_ints(AVIOContext *pb, uint32_t *data, int count)
138{
139 int i, total = 0;
140 for (i = 0; i < count; i++) {
141 if ((data[total] = avio_rl32(pb)))
142 total++;
143 }
144 return total;
145}
146
147/**
148 * Open file
149 * @param first_sector First sector
150 * @param length Length of file (bytes)
151 * @param depth File allocation table depth
152 * @return NULL on error
153 */
154static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
155{
156 AVIOContext *pb;
157 WtvFile *wf;
158 uint8_t *buffer;
159 int64_t size;
160
161 if (seek_by_sector(s->pb, first_sector, 0) < 0)
162 return NULL;
163
164 wf = av_mallocz(sizeof(WtvFile));
165 if (!wf)
166 return NULL;
167
168 if (depth == 0) {
169 wf->sectors = av_malloc(sizeof(uint32_t));
170 if (!wf->sectors) {
171 av_free(wf);
172 return NULL;
173 }
174 wf->sectors[0] = first_sector;
175 wf->nb_sectors = 1;
176 } else if (depth == 1) {
177 wf->sectors = av_malloc(WTV_SECTOR_SIZE);
178 if (!wf->sectors) {
179 av_free(wf);
180 return NULL;
181 }
182 wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
183 } else if (depth == 2) {
184 uint32_t sectors1[WTV_SECTOR_SIZE / 4];
185 int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
186 int i;
187
188 wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS);
189 if (!wf->sectors) {
190 av_free(wf);
191 return NULL;
192 }
193 wf->nb_sectors = 0;
194 for (i = 0; i < nb_sectors1; i++) {
195 if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
196 break;
197 wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
198 }
199 } else {
200 av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
201 av_free(wf);
202 return NULL;
203 }
204 wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
205
206 if (!wf->nb_sectors) {
207 av_free(wf->sectors);
208 av_free(wf);
209 return NULL;
210 }
211
212 size = avio_size(s->pb);
213 if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
214 av_log(s, AV_LOG_WARNING, "truncated file\n");
215
216 /* check length */
217 length &= 0xFFFFFFFFFFFF;
218 if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
219 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);
220 length = (int64_t)wf->nb_sectors << wf->sector_bits;
221 }
222 wf->length = length;
223
224 /* seek to initial sector */
225 wf->position = 0;
226 if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
227 av_free(wf->sectors);
228 av_free(wf);
229 return NULL;
230 }
231
232 wf->pb_filesystem = s->pb;
233 buffer = av_malloc(1 << wf->sector_bits);
234 if (!buffer) {
235 av_free(wf->sectors);
236 av_free(wf);
237 return NULL;
238 }
239
240 pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
241 wtvfile_read_packet, NULL, wtvfile_seek);
242 if (!pb) {
243 av_free(buffer);
244 av_free(wf->sectors);
245 av_free(wf);
246 }
247 return pb;
248}
249
250/**
251 * Open file using filename
252 * @param[in] buf directory buffer
253 * @param buf_size directory buffer size
254 * @param[in] filename
255 * @param filename_size size of filename
256 * @return NULL on error
257 */
258static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
259{
260 const uint8_t *buf_end = buf + buf_size;
261
262 while(buf + 48 <= buf_end) {
263 int dir_length, name_size, first_sector, depth;
264 uint64_t file_length;
265 const uint8_t *name;
266 if (ff_guidcmp(buf, ff_dir_entry_guid)) {
267 av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
268 "remaining directory entries ignored\n", FF_ARG_GUID(buf));
269 break;
270 }
271 dir_length = AV_RL16(buf + 16);
272 file_length = AV_RL64(buf + 24);
273 name_size = 2 * AV_RL32(buf + 32);
274 if (name_size < 0) {
275 av_log(s, AV_LOG_ERROR,
276 "bad filename length, remaining directory entries ignored\n");
277 break;
278 }
279 if (48 + (int64_t)name_size > buf_end - buf) {
280 av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
281 break;
282 }
283 first_sector = AV_RL32(buf + 40 + name_size);
284 depth = AV_RL32(buf + 44 + name_size);
285
286 /* compare file name; test optional null terminator */
287 name = buf + 40;
288 if (name_size >= filename_size &&
289 !memcmp(name, filename, filename_size) &&
290 (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
291 return wtvfile_open_sector(first_sector, file_length, depth, s);
292
293 buf += dir_length;
294 }
295 return 0;
296}
297
298#define wtvfile_open(s, buf, buf_size, filename) \
299 wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
300
301/**
302 * Close file opened with wtvfile_open_sector(), or wtv_open()
303 */
304static void wtvfile_close(AVIOContext *pb)
305{
306 WtvFile *wf = pb->opaque;
307 av_free(wf->sectors);
308 av_freep(&pb->opaque);
309 av_freep(&pb->buffer);
310 av_free(pb);
311}
312
313/*
314 *
315 * Main demuxer
316 *
317 */
318
319typedef struct {
320 int seen_data;
321} WtvStream;
322
323typedef struct {
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 interative 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 */
337static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
338 {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
339static const ff_asf_guid EVENTID_LanguageSpanningEvent =
340 {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
341static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
342 {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
343static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
344 {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
345static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
346 {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
347static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
348 {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
349static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
350 {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
351static const ff_asf_guid EVENTID_TeletextSpanningEvent =
352 {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
353static 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 */
359static const ff_asf_guid mediasubtype_mpeg1payload =
360 {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
361static const ff_asf_guid mediatype_mpeg2_sections =
362 {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
363static const ff_asf_guid mediatype_mpeg2_pes =
364 {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
365static 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 */
369static const ff_asf_guid mediasubtype_dvb_subtitle =
370 {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
371static const ff_asf_guid mediasubtype_teletext =
372 {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
373static const ff_asf_guid mediasubtype_dtvccdata =
374 {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
375static 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
378static int read_probe(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 */
387static 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 */
403static 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 */
419static 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
431static 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->codec->codec_type = AVMEDIA_TYPE_VIDEO;
455 st->codec->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;
463done:
464 avio_seek(pb, pos + length, SEEK_SET);
465}
466
467static 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 */
539static 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 */
566static 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->codec->codec_tag = ff_get_bmp_header(pb, st, NULL);
573
574 return 72 + 40;
575}
576
577/**
578 * Parse MPEG1WAVEFORMATEX extradata structure
579 */
580static void parse_mpeg1waveformatex(AVStream *st)
581{
582 /* fwHeadLayer */
583 switch (AV_RL16(st->codec->extradata)) {
584 case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break;
585 case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break;
586 case 0x0004 : st->codec->codec_id = AV_CODEC_ID_MP3; break;
587 }
588
589 st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
590
591 /* dwHeadMode */
592 switch (AV_RL16(st->codec->extradata + 6)) {
593 case 1 :
594 case 2 :
595 case 4 : st->codec->channels = 2;
596 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
597 break;
598 case 8 : st->codec->channels = 1;
599 st->codec->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 */
609static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
610{
611 if (st) {
612 if (st->codec->extradata) {
613 av_freep(&st->codec->extradata);
614 st->codec->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->codec->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 */
643static 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 avio_seek(pb, -size, SEEK_CUR);
664
665 st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
666 avio_skip(pb, 32);
667 return st;
668 } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
669 st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
670 if (!st)
671 return NULL;
672 if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
673 int ret = ff_get_wav_header(pb, st->codec, size);
674 if (ret < 0)
675 return NULL;
676 } else {
677 if (ff_guidcmp(formattype, ff_format_none))
678 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
679 avio_skip(pb, size);
680 }
681
682 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
683 st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
684 } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
685 if (st->codec->extradata && st->codec->extradata_size >= 22)
686 parse_mpeg1waveformatex(st);
687 else
688 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
689 } else {
690 st->codec->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
691 if (st->codec->codec_id == AV_CODEC_ID_NONE)
692 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
693 }
694 return st;
695 } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
696 st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
697 if (!st)
698 return NULL;
699 if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
700 int consumed = parse_videoinfoheader2(s, st);
701 avio_skip(pb, FFMAX(size - consumed, 0));
702 } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
703 uint64_t consumed = parse_videoinfoheader2(s, st);
704 /* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
705 avio_skip(pb, FFMAX(size - consumed, 0));
706 } else {
707 if (ff_guidcmp(formattype, ff_format_none))
708 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
709 avio_skip(pb, size);
710 }
711
712 if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
713 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
714 } else {
715 st->codec->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
716 }
717 if (st->codec->codec_id == AV_CODEC_ID_NONE)
718 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
719 return st;
720 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
721 !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
722 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
723 if (!st)
724 return NULL;
725 if (ff_guidcmp(formattype, ff_format_none))
726 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
727 avio_skip(pb, size);
728 st->codec->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
729 return st;
730 } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
731 (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
732 st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
733 if (!st)
734 return NULL;
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 st->codec->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
739 return st;
740 } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
741 !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
742 if (ff_guidcmp(formattype, ff_format_none))
743 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
744 avio_skip(pb, size);
745 return NULL;
746 }
747
748 av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
749 ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
750 FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
751 avio_skip(pb, size);
752 return NULL;
753}
754
755enum {
756 SEEK_TO_DATA = 0,
757 SEEK_TO_PTS,
758};
759
760/**
761 * Try to seek over a broken chunk
762 * @return <0 on error
763 */
764static int recover(WtvContext *wtv, uint64_t broken_pos)
765{
766 AVIOContext *pb = wtv->pb;
767 int i;
768 for (i = 0; i < wtv->nb_index_entries; i++) {
769 if (wtv->index_entries[i].pos > broken_pos) {
770 int ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
771 if (ret < 0)
772 return ret;
773 wtv->pts = wtv->index_entries[i].timestamp;
774 return 0;
775 }
776 }
777 return AVERROR(EIO);
778}
779
780/**
781 * Parse WTV chunks
782 * @param mode SEEK_TO_DATA or SEEK_TO_PTS
783 * @param seekts timestamp
784 * @param[out] len_ptr Length of data chunk
785 * @return stream index of data chunk, or <0 on error
786 */
787static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
788{
789 WtvContext *wtv = s->priv_data;
790 AVIOContext *pb = wtv->pb;
791 while (!avio_feof(pb)) {
792 ff_asf_guid g;
793 int len, sid, consumed;
794
795 ff_get_guid(pb, &g);
796 len = avio_rl32(pb);
797 if (len < 32) {
798 int ret;
799 if (avio_feof(pb))
800 return AVERROR_EOF;
801 av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
802 if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
803 return ret;
804 continue;
805 }
806 sid = avio_rl32(pb) & 0x7FFF;
807 avio_skip(pb, 8);
808 consumed = 32;
809
810 if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
811 if (ff_find_stream_index(s, sid) < 0) {
812 ff_asf_guid mediatype, subtype, formattype;
813 int size;
814 avio_skip(pb, 28);
815 ff_get_guid(pb, &mediatype);
816 ff_get_guid(pb, &subtype);
817 avio_skip(pb, 12);
818 ff_get_guid(pb, &formattype);
819 size = avio_rl32(pb);
820 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
821 consumed += 92 + size;
822 }
823 } else if (!ff_guidcmp(g, ff_stream2_guid)) {
824 int stream_index = ff_find_stream_index(s, sid);
825 if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
826 ff_asf_guid mediatype, subtype, formattype;
827 int size;
828 avio_skip(pb, 12);
829 ff_get_guid(pb, &mediatype);
830 ff_get_guid(pb, &subtype);
831 avio_skip(pb, 12);
832 ff_get_guid(pb, &formattype);
833 size = avio_rl32(pb);
834 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
835 consumed += 76 + size;
836 }
837 } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
838 !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
839 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
840 !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
841 !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
842 !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
843 int stream_index = ff_find_stream_index(s, sid);
844 if (stream_index >= 0) {
845 AVStream *st = s->streams[stream_index];
846 uint8_t buf[258];
847 const uint8_t *pbuf = buf;
848 int buf_size;
849
850 avio_skip(pb, 8);
851 consumed += 8;
852 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
853 !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
854 avio_skip(pb, 6);
855 consumed += 6;
856 }
857
858 buf_size = FFMIN(len - consumed, sizeof(buf));
859 avio_read(pb, buf, buf_size);
860 consumed += buf_size;
861 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
862 }
863 } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
864 int stream_index = ff_find_stream_index(s, sid);
865 if (stream_index >= 0) {
866 AVStream *st = s->streams[stream_index];
867 int audio_type;
868 avio_skip(pb, 8);
869 audio_type = avio_r8(pb);
870 if (audio_type == 2)
871 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
872 else if (audio_type == 3)
873 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
874 consumed += 9;
875 }
876 } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
877 int stream_index = ff_find_stream_index(s, sid);
878 if (stream_index >= 0) {
879 avio_skip(pb, 12);
880 if (avio_rl32(pb))
881 av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
882 consumed += 16;
883 }
884 } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
885 int stream_index = ff_find_stream_index(s, sid);
886 if (stream_index >= 0) {
887 AVStream *st = s->streams[stream_index];
888 uint8_t language[4];
889 avio_skip(pb, 12);
890 avio_read(pb, language, 3);
891 if (language[0]) {
892 language[3] = 0;
893 av_dict_set(&st->metadata, "language", language, 0);
894 if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
895 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
896 }
897 consumed += 15;
898 }
899 } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
900 int stream_index = ff_find_stream_index(s, sid);
901 if (stream_index >= 0) {
902 avio_skip(pb, 8);
903 wtv->pts = avio_rl64(pb);
904 consumed += 16;
905 if (wtv->pts == -1)
906 wtv->pts = AV_NOPTS_VALUE;
907 else {
908 wtv->last_valid_pts = wtv->pts;
909 if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
910 wtv->epoch = wtv->pts;
911 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
912 avio_skip(pb, WTV_PAD8(len) - consumed);
913 return 0;
914 }
915 }
916 }
917 } else if (!ff_guidcmp(g, ff_data_guid)) {
918 int stream_index = ff_find_stream_index(s, sid);
919 if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
920 WtvStream *wst = s->streams[stream_index]->priv_data;
921 wst->seen_data = 1;
922 if (len_ptr) {
923 *len_ptr = len;
924 }
925 return stream_index;
926 }
927 } 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})) {
928 int stream_index = ff_find_stream_index(s, sid);
929 if (stream_index >= 0)
930 av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
931 } else if (
932 !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}) ||
933 !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}) ||
934 !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}) ||
935 !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
936 !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}) ||
937 !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}) ||
938 !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}) ||
939 !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}) ||
940 !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}) ||
941 !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}) ||
942 !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}) ||
943 !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
944 !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
945 !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
946 !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
947 !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
948 !ff_guidcmp(g, ff_index_guid) ||
949 !ff_guidcmp(g, ff_sync_guid) ||
950 !ff_guidcmp(g, ff_stream1_guid) ||
951 !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
952 //ignore known guids
953 } else
954 av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
955
956 avio_skip(pb, WTV_PAD8(len) - consumed);
957 }
958 return AVERROR_EOF;
959}
960
961static int read_header(AVFormatContext *s)
962{
963 WtvContext *wtv = s->priv_data;
964 int root_sector, root_size;
965 uint8_t root[WTV_SECTOR_SIZE];
966 AVIOContext *pb;
967 int64_t timeline_pos;
968 int ret;
969
970 wtv->epoch =
971 wtv->pts =
972 wtv->last_valid_pts = AV_NOPTS_VALUE;
973
974 /* read root directory sector */
975 avio_skip(s->pb, 0x30);
976 root_size = avio_rl32(s->pb);
977 if (root_size > sizeof(root)) {
978 av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
979 return AVERROR_INVALIDDATA;
980 }
981 avio_skip(s->pb, 4);
982 root_sector = avio_rl32(s->pb);
983
984 ret = seek_by_sector(s->pb, root_sector, 0);
985 if (ret < 0)
986 return ret;
987 root_size = avio_read(s->pb, root, root_size);
988 if (root_size < 0)
989 return AVERROR_INVALIDDATA;
990
991 /* parse chunks up until first data chunk */
992 wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
993 if (!wtv->pb) {
994 av_log(s, AV_LOG_ERROR, "timeline data missing\n");
995 return AVERROR_INVALIDDATA;
996 }
997
998 ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
999 if (ret < 0)
1000 return ret;
1001 avio_seek(wtv->pb, -32, SEEK_CUR);
1002
1003 timeline_pos = avio_tell(s->pb); // save before opening another file
1004
1005 /* read metadata */
1006 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
1007 if (pb) {
1008 parse_legacy_attrib(s, pb);
1009 wtvfile_close(pb);
1010 }
1011
1012 /* read seek index */
1013 if (s->nb_streams) {
1014 AVStream *st = s->streams[0];
1015 pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
1016 if (pb) {
1017 while(1) {
1018 uint64_t timestamp = avio_rl64(pb);
1019 uint64_t frame_nb = avio_rl64(pb);
1020 if (avio_feof(pb))
1021 break;
1022 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
1023 0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
1024 }
1025 wtvfile_close(pb);
1026
1027 if (wtv->nb_index_entries) {
1028 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
1029 if (pb) {
1030 int i;
1031 while (1) {
1032 uint64_t frame_nb = avio_rl64(pb);
1033 uint64_t position = avio_rl64(pb);
1034 if (avio_feof(pb))
1035 break;
1036 for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
1037 AVIndexEntry *e = wtv->index_entries + i;
1038 if (frame_nb > e->size)
1039 break;
1040 if (position > e->pos)
1041 e->pos = position;
1042 }
1043 }
1044 wtvfile_close(pb);
1045 st->duration = wtv->index_entries[wtv->nb_index_entries - 1].timestamp;
1046 }
1047 }
1048 }
1049 }
1050
1051 avio_seek(s->pb, timeline_pos, SEEK_SET);
1052 return 0;
1053}
1054
1055static int read_packet(AVFormatContext *s, AVPacket *pkt)
1056{
1057 WtvContext *wtv = s->priv_data;
1058 AVIOContext *pb = wtv->pb;
1059 int stream_index, len, ret;
1060
1061 stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
1062 if (stream_index < 0)
1063 return stream_index;
1064
1065 ret = av_get_packet(pb, pkt, len - 32);
1066 if (ret < 0)
1067 return ret;
1068 pkt->stream_index = stream_index;
1069 pkt->pts = wtv->pts;
1070 avio_skip(pb, WTV_PAD8(len) - len);
1071 return 0;
1072}
1073
1074static int read_seek(AVFormatContext *s, int stream_index,
1075 int64_t ts, int flags)
1076{
1077 WtvContext *wtv = s->priv_data;
1078 AVIOContext *pb = wtv->pb;
1079 AVStream *st = s->streams[0];
1080 int64_t ts_relative;
1081 int i;
1082
1083 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
1084 return AVERROR(ENOSYS);
1085
1086 /* timestamp adjustment is required because wtv->pts values are absolute,
1087 * whereas AVIndexEntry->timestamp values are relative to epoch. */
1088 ts_relative = ts;
1089 if (wtv->epoch != AV_NOPTS_VALUE)
1090 ts_relative -= wtv->epoch;
1091
1092 i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
1093 if (i < 0) {
1094 if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
1095 if (avio_seek(pb, 0, SEEK_SET) < 0)
1096 return -1;
1097 } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
1098 if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
1099 return -1;
1100 }
1101 if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
1102 return AVERROR(ERANGE);
1103 return 0;
1104 }
1105 if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
1106 return -1;
1107 wtv->pts = wtv->index_entries[i].timestamp;
1108 if (wtv->epoch != AV_NOPTS_VALUE)
1109 wtv->pts += wtv->epoch;
1110 wtv->last_valid_pts = wtv->pts;
1111 return 0;
1112}
1113
1114static int read_close(AVFormatContext *s)
1115{
1116 WtvContext *wtv = s->priv_data;
1117 av_freep(&wtv->index_entries);
1118 wtvfile_close(wtv->pb);
1119 return 0;
1120}
1121
1122AVInputFormat ff_wtv_demuxer = {
1123 .name = "wtv",
1124 .long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
1125 .priv_data_size = sizeof(WtvContext),
1126 .read_probe = read_probe,
1127 .read_header = read_header,
1128 .read_packet = read_packet,
1129 .read_seek = read_seek,
1130 .read_close = read_close,
1131 .flags = AVFMT_SHOW_IDS,
1132};