1 /*
2 * AVI demuxer
3 * Copyright (c) 2001 Fabrice Bellard
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 #include <inttypes.h>
23
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "avformat.h"
32 #include "avi.h"
33 #include "dv.h"
34 #include "internal.h"
35 #include "isom.h"
36 #include "riff.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 #include "libavcodec/internal.h"
40
41 typedef struct AVIStream {
42 int64_t frame_offset; /* current frame (video) or byte (audio) counter
43 * (used to compute the pts) */
44 int remaining;
45 int packet_size;
46
47 uint32_t handler;
48 uint32_t scale;
49 uint32_t rate;
50 int sample_size; /* size of one sample (or packet)
51 * (in the rate/scale sense) in bytes */
52
53 int64_t cum_len; /* temporary storage (used during seek) */
54 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
55 int prefix_count;
56 uint32_t pal[256];
57 int has_pal;
58 int dshow_block_align; /* block align variable used to emulate bugs in
59 * the MS dshow demuxer */
60
61 AVFormatContext *sub_ctx;
62 AVPacket sub_pkt;
63 uint8_t *sub_buffer;
64
65 int64_t seek_pos;
66 } AVIStream;
67
68 typedef struct AVIContext {
69 const AVClass *class;
70 int64_t riff_end;
71 int64_t movi_end;
72 int64_t fsize;
73 int64_t io_fsize;
74 int64_t movi_list;
75 int64_t last_pkt_pos;
76 int index_loaded;
77 int is_odml;
78 int non_interleaved;
79 int stream_index;
80 DVDemuxContext *dv_demux;
81 int odml_depth;
82 int use_odml;
83 #define MAX_ODML_DEPTH 1000
84 int64_t dts_max;
85 } AVIContext;
86
87
88 static const AVOption options[] = {
89 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
90 { NULL },
91 };
92
93 static const AVClass demuxer_class = {
94 .class_name = "avi",
95 .item_name = av_default_item_name,
96 .option = options,
97 .version = LIBAVUTIL_VERSION_INT,
98 .category = AV_CLASS_CATEGORY_DEMUXER,
99 };
100
101
102 static const char avi_headers[][8] = {
103 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
104 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
105 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
106 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
107 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
108 { 0 }
109 };
110
111 static const AVMetadataConv avi_metadata_conv[] = {
112 { "strn", "title" },
113 { 0 },
114 };
115
116 static int avi_load_index(AVFormatContext *s);
117 static int guess_ni_flag(AVFormatContext *s);
118
119 #define print_tag(s, str, tag, size) \
120 av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
121 avio_tell(pb), str, av_fourcc2str(tag), size) \
122
get_duration(AVIStream * ast,int len)123 static inline int get_duration(AVIStream *ast, int len)
124 {
125 if (ast->sample_size)
126 return len;
127 else if (ast->dshow_block_align)
128 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
129 else
130 return 1;
131 }
132
get_riff(AVFormatContext * s,AVIOContext * pb)133 static int get_riff(AVFormatContext *s, AVIOContext *pb)
134 {
135 AVIContext *avi = s->priv_data;
136 char header[8] = {0};
137 int i;
138
139 /* check RIFF header */
140 avio_read(pb, header, 4);
141 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
142 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
143 avio_read(pb, header + 4, 4);
144
145 for (i = 0; avi_headers[i][0]; i++)
146 if (!memcmp(header, avi_headers[i], 8))
147 break;
148 if (!avi_headers[i][0])
149 return AVERROR_INVALIDDATA;
150
151 if (header[7] == 0x19)
152 av_log(s, AV_LOG_INFO,
153 "This file has been generated by a totally broken muxer.\n");
154
155 return 0;
156 }
157
read_odml_index(AVFormatContext * s,int frame_num)158 static int read_odml_index(AVFormatContext *s, int frame_num)
159 {
160 AVIContext *avi = s->priv_data;
161 AVIOContext *pb = s->pb;
162 int longs_per_entry = avio_rl16(pb);
163 int index_sub_type = avio_r8(pb);
164 int index_type = avio_r8(pb);
165 int entries_in_use = avio_rl32(pb);
166 int chunk_id = avio_rl32(pb);
167 int64_t base = avio_rl64(pb);
168 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
169 ((chunk_id >> 8 & 0xFF) - '0');
170 AVStream *st;
171 AVIStream *ast;
172 int i;
173 int64_t last_pos = -1;
174 int64_t filesize = avi->fsize;
175
176 av_log(s, AV_LOG_TRACE,
177 "longs_per_entry:%d index_type:%d entries_in_use:%d "
178 "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
179 longs_per_entry,
180 index_type,
181 entries_in_use,
182 chunk_id,
183 base,
184 frame_num);
185
186 if (stream_id >= s->nb_streams || stream_id < 0)
187 return AVERROR_INVALIDDATA;
188 st = s->streams[stream_id];
189 ast = st->priv_data;
190
191 if (index_sub_type)
192 return AVERROR_INVALIDDATA;
193
194 avio_rl32(pb);
195
196 if (index_type && longs_per_entry != 2)
197 return AVERROR_INVALIDDATA;
198 if (index_type > 1)
199 return AVERROR_INVALIDDATA;
200
201 if (filesize > 0 && base >= filesize) {
202 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
203 if (base >> 32 == (base & 0xFFFFFFFF) &&
204 (base & 0xFFFFFFFF) < filesize &&
205 filesize <= 0xFFFFFFFF)
206 base &= 0xFFFFFFFF;
207 else
208 return AVERROR_INVALIDDATA;
209 }
210
211 for (i = 0; i < entries_in_use; i++) {
212 if (index_type) {
213 int64_t pos = avio_rl32(pb) + base - 8;
214 int len = avio_rl32(pb);
215 int key = len >= 0;
216 len &= 0x7FFFFFFF;
217
218 av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
219
220 if (avio_feof(pb))
221 return AVERROR_INVALIDDATA;
222
223 if (last_pos == pos || pos == base - 8)
224 avi->non_interleaved = 1;
225 if (last_pos != pos && len)
226 av_add_index_entry(st, pos, ast->cum_len, len, 0,
227 key ? AVINDEX_KEYFRAME : 0);
228
229 ast->cum_len += get_duration(ast, len);
230 last_pos = pos;
231 } else {
232 int64_t offset, pos;
233 int duration;
234 offset = avio_rl64(pb);
235 avio_rl32(pb); /* size */
236 duration = avio_rl32(pb);
237
238 if (avio_feof(pb))
239 return AVERROR_INVALIDDATA;
240
241 pos = avio_tell(pb);
242
243 if (avi->odml_depth > MAX_ODML_DEPTH) {
244 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
245 return AVERROR_INVALIDDATA;
246 }
247
248 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
249 return -1;
250 avi->odml_depth++;
251 read_odml_index(s, frame_num);
252 avi->odml_depth--;
253 frame_num += duration;
254
255 if (avio_seek(pb, pos, SEEK_SET) < 0) {
256 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
257 return -1;
258 }
259
260 }
261 }
262 avi->index_loaded = 2;
263 return 0;
264 }
265
clean_index(AVFormatContext * s)266 static void clean_index(AVFormatContext *s)
267 {
268 int i;
269 int64_t j;
270
271 for (i = 0; i < s->nb_streams; i++) {
272 AVStream *st = s->streams[i];
273 AVIStream *ast = st->priv_data;
274 int n = st->nb_index_entries;
275 int max = ast->sample_size;
276 int64_t pos, size, ts;
277
278 if (n != 1 || ast->sample_size == 0)
279 continue;
280
281 while (max < 1024)
282 max += max;
283
284 pos = st->index_entries[0].pos;
285 size = st->index_entries[0].size;
286 ts = st->index_entries[0].timestamp;
287
288 for (j = 0; j < size; j += max)
289 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
290 AVINDEX_KEYFRAME);
291 }
292 }
293
avi_read_tag(AVFormatContext * s,AVStream * st,uint32_t tag,uint32_t size)294 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
295 uint32_t size)
296 {
297 AVIOContext *pb = s->pb;
298 char key[5] = { 0 };
299 char *value;
300
301 size += (size & 1);
302
303 if (size == UINT_MAX)
304 return AVERROR(EINVAL);
305 value = av_malloc(size + 1);
306 if (!value)
307 return AVERROR(ENOMEM);
308 if (avio_read(pb, value, size) != size) {
309 av_freep(&value);
310 return AVERROR_INVALIDDATA;
311 }
312 value[size] = 0;
313
314 AV_WL32(key, tag);
315
316 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
317 AV_DICT_DONT_STRDUP_VAL);
318 }
319
320 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
321 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
322
avi_metadata_creation_time(AVDictionary ** metadata,char * date)323 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
324 {
325 char month[4], time[9], buffer[64];
326 int i, day, year;
327 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
328 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
329 month, &day, time, &year) == 4) {
330 for (i = 0; i < 12; i++)
331 if (!av_strcasecmp(month, months[i])) {
332 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
333 year, i + 1, day, time);
334 av_dict_set(metadata, "creation_time", buffer, 0);
335 }
336 } else if (date[4] == '/' && date[7] == '/') {
337 date[4] = date[7] = '-';
338 av_dict_set(metadata, "creation_time", date, 0);
339 }
340 }
341
avi_read_nikon(AVFormatContext * s,uint64_t end)342 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
343 {
344 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
345 uint32_t tag = avio_rl32(s->pb);
346 uint32_t size = avio_rl32(s->pb);
347 switch (tag) {
348 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
349 {
350 uint64_t tag_end = avio_tell(s->pb) + size;
351 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
352 uint16_t tag = avio_rl16(s->pb);
353 uint16_t size = avio_rl16(s->pb);
354 const char *name = NULL;
355 char buffer[64] = { 0 };
356 size = FFMIN(size, tag_end - avio_tell(s->pb));
357 size -= avio_read(s->pb, buffer,
358 FFMIN(size, sizeof(buffer) - 1));
359 switch (tag) {
360 case 0x03:
361 name = "maker";
362 break;
363 case 0x04:
364 name = "model";
365 break;
366 case 0x13:
367 name = "creation_time";
368 if (buffer[4] == ':' && buffer[7] == ':')
369 buffer[4] = buffer[7] = '-';
370 break;
371 }
372 if (name)
373 av_dict_set(&s->metadata, name, buffer, 0);
374 avio_skip(s->pb, size);
375 }
376 break;
377 }
378 default:
379 avio_skip(s->pb, size);
380 break;
381 }
382 }
383 }
384
avi_extract_stream_metadata(AVFormatContext * s,AVStream * st)385 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
386 {
387 GetByteContext gb;
388 uint8_t *data = st->codecpar->extradata;
389 int data_size = st->codecpar->extradata_size;
390 int tag, offset;
391
392 if (!data || data_size < 8) {
393 return AVERROR_INVALIDDATA;
394 }
395
396 bytestream2_init(&gb, data, data_size);
397
398 tag = bytestream2_get_le32(&gb);
399
400 switch (tag) {
401 case MKTAG('A', 'V', 'I', 'F'):
402 // skip 4 byte padding
403 bytestream2_skip(&gb, 4);
404 offset = bytestream2_tell(&gb);
405
406 // decode EXIF tags from IFD, AVI is always little-endian
407 return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
408 1, 0, &st->metadata);
409 break;
410 case MKTAG('C', 'A', 'S', 'I'):
411 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
412 break;
413 case MKTAG('Z', 'o', 'r', 'a'):
414 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
415 break;
416 default:
417 break;
418 }
419
420 return 0;
421 }
422
calculate_bitrate(AVFormatContext * s)423 static int calculate_bitrate(AVFormatContext *s)
424 {
425 AVIContext *avi = s->priv_data;
426 int i, j;
427 int64_t lensum = 0;
428 int64_t maxpos = 0;
429
430 for (i = 0; i<s->nb_streams; i++) {
431 int64_t len = 0;
432 AVStream *st = s->streams[i];
433
434 if (!st->nb_index_entries)
435 continue;
436
437 for (j = 0; j < st->nb_index_entries; j++)
438 len += st->index_entries[j].size;
439 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
440 lensum += len;
441 }
442 if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
443 return 0;
444 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
445 return 0;
446
447 for (i = 0; i<s->nb_streams; i++) {
448 int64_t len = 0;
449 AVStream *st = s->streams[i];
450 int64_t duration;
451 int64_t bitrate;
452
453 for (j = 0; j < st->nb_index_entries; j++)
454 len += st->index_entries[j].size;
455
456 if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
457 continue;
458 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
459 bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
460 if (bitrate > 0) {
461 st->codecpar->bit_rate = bitrate;
462 }
463 }
464 return 1;
465 }
466
avi_read_header(AVFormatContext * s)467 static int avi_read_header(AVFormatContext *s)
468 {
469 AVIContext *avi = s->priv_data;
470 AVIOContext *pb = s->pb;
471 unsigned int tag, tag1, handler;
472 int codec_type, stream_index, frame_period;
473 unsigned int size;
474 int i;
475 AVStream *st;
476 AVIStream *ast = NULL;
477 int avih_width = 0, avih_height = 0;
478 int amv_file_format = 0;
479 uint64_t list_end = 0;
480 int64_t pos;
481 int ret;
482 AVDictionaryEntry *dict_entry;
483
484 avi->stream_index = -1;
485
486 ret = get_riff(s, pb);
487 if (ret < 0)
488 return ret;
489
490 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
491
492 avi->io_fsize = avi->fsize = avio_size(pb);
493 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
494 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
495
496 /* first list tag */
497 stream_index = -1;
498 codec_type = -1;
499 frame_period = 0;
500 for (;;) {
501 if (avio_feof(pb))
502 goto fail;
503 tag = avio_rl32(pb);
504 size = avio_rl32(pb);
505
506 print_tag(s, "tag", tag, size);
507
508 switch (tag) {
509 case MKTAG('L', 'I', 'S', 'T'):
510 list_end = avio_tell(pb) + size;
511 /* Ignored, except at start of video packets. */
512 tag1 = avio_rl32(pb);
513
514 print_tag(s, "list", tag1, 0);
515
516 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
517 avi->movi_list = avio_tell(pb) - 4;
518 if (size)
519 avi->movi_end = avi->movi_list + size + (size & 1);
520 else
521 avi->movi_end = avi->fsize;
522 av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
523 goto end_of_header;
524 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
525 ff_read_riff_info(s, size - 4);
526 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
527 avi_read_nikon(s, list_end);
528
529 break;
530 case MKTAG('I', 'D', 'I', 'T'):
531 {
532 unsigned char date[64] = { 0 };
533 size += (size & 1);
534 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
535 avio_skip(pb, size);
536 avi_metadata_creation_time(&s->metadata, date);
537 break;
538 }
539 case MKTAG('d', 'm', 'l', 'h'):
540 avi->is_odml = 1;
541 avio_skip(pb, size + (size & 1));
542 break;
543 case MKTAG('a', 'm', 'v', 'h'):
544 amv_file_format = 1;
545 case MKTAG('a', 'v', 'i', 'h'):
546 /* AVI header */
547 /* using frame_period is bad idea */
548 frame_period = avio_rl32(pb);
549 avio_rl32(pb); /* max. bytes per second */
550 avio_rl32(pb);
551 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
552
553 avio_skip(pb, 2 * 4);
554 avio_rl32(pb);
555 avio_rl32(pb);
556 avih_width = avio_rl32(pb);
557 avih_height = avio_rl32(pb);
558
559 avio_skip(pb, size - 10 * 4);
560 break;
561 case MKTAG('s', 't', 'r', 'h'):
562 /* stream header */
563
564 tag1 = avio_rl32(pb);
565 handler = avio_rl32(pb); /* codec tag */
566
567 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
568 avio_skip(pb, size - 8);
569 break;
570 } else {
571 stream_index++;
572 st = avformat_new_stream(s, NULL);
573 if (!st)
574 goto fail;
575
576 st->id = stream_index;
577 ast = av_mallocz(sizeof(AVIStream));
578 if (!ast)
579 goto fail;
580 st->priv_data = ast;
581 }
582 if (amv_file_format)
583 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
584 : MKTAG('v', 'i', 'd', 's');
585
586 print_tag(s, "strh", tag1, -1);
587
588 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
589 tag1 == MKTAG('i', 'v', 'a', 's')) {
590 int64_t dv_dur;
591
592 /* After some consideration -- I don't think we
593 * have to support anything but DV in type1 AVIs. */
594 if (s->nb_streams != 1)
595 goto fail;
596
597 if (handler != MKTAG('d', 'v', 's', 'd') &&
598 handler != MKTAG('d', 'v', 'h', 'd') &&
599 handler != MKTAG('d', 'v', 's', 'l'))
600 goto fail;
601
602 ast = s->streams[0]->priv_data;
603 av_freep(&s->streams[0]->codecpar->extradata);
604 av_freep(&s->streams[0]->codecpar);
605 #if FF_API_LAVF_AVCTX
606 FF_DISABLE_DEPRECATION_WARNINGS
607 av_freep(&s->streams[0]->codec);
608 FF_ENABLE_DEPRECATION_WARNINGS
609 #endif
610 if (s->streams[0]->info)
611 av_freep(&s->streams[0]->info->duration_error);
612 av_freep(&s->streams[0]->info);
613 if (s->streams[0]->internal)
614 av_freep(&s->streams[0]->internal->avctx);
615 av_freep(&s->streams[0]->internal);
616 av_freep(&s->streams[0]);
617 s->nb_streams = 0;
618 if (CONFIG_DV_DEMUXER) {
619 avi->dv_demux = avpriv_dv_init_demux(s);
620 if (!avi->dv_demux)
621 goto fail;
622 } else
623 goto fail;
624 s->streams[0]->priv_data = ast;
625 avio_skip(pb, 3 * 4);
626 ast->scale = avio_rl32(pb);
627 ast->rate = avio_rl32(pb);
628 avio_skip(pb, 4); /* start time */
629
630 dv_dur = avio_rl32(pb);
631 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
632 dv_dur *= AV_TIME_BASE;
633 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
634 }
635 /* else, leave duration alone; timing estimation in utils.c
636 * will make a guess based on bitrate. */
637
638 stream_index = s->nb_streams - 1;
639 avio_skip(pb, size - 9 * 4);
640 break;
641 }
642
643 av_assert0(stream_index < s->nb_streams);
644 ast->handler = handler;
645
646 avio_rl32(pb); /* flags */
647 avio_rl16(pb); /* priority */
648 avio_rl16(pb); /* language */
649 avio_rl32(pb); /* initial frame */
650 ast->scale = avio_rl32(pb);
651 ast->rate = avio_rl32(pb);
652 if (!(ast->scale && ast->rate)) {
653 av_log(s, AV_LOG_WARNING,
654 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
655 "(This file has been generated by broken software.)\n",
656 ast->scale,
657 ast->rate);
658 if (frame_period) {
659 ast->rate = 1000000;
660 ast->scale = frame_period;
661 } else {
662 ast->rate = 25;
663 ast->scale = 1;
664 }
665 }
666 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
667
668 ast->cum_len = avio_rl32(pb); /* start */
669 st->nb_frames = avio_rl32(pb);
670
671 st->start_time = 0;
672 avio_rl32(pb); /* buffer size */
673 avio_rl32(pb); /* quality */
674 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
675 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
676 ast->cum_len = 0;
677 }
678 ast->sample_size = avio_rl32(pb);
679 ast->cum_len *= FFMAX(1, ast->sample_size);
680 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
681 ast->rate, ast->scale, ast->sample_size);
682
683 switch (tag1) {
684 case MKTAG('v', 'i', 'd', 's'):
685 codec_type = AVMEDIA_TYPE_VIDEO;
686
687 ast->sample_size = 0;
688 st->avg_frame_rate = av_inv_q(st->time_base);
689 break;
690 case MKTAG('a', 'u', 'd', 's'):
691 codec_type = AVMEDIA_TYPE_AUDIO;
692 break;
693 case MKTAG('t', 'x', 't', 's'):
694 codec_type = AVMEDIA_TYPE_SUBTITLE;
695 break;
696 case MKTAG('d', 'a', 't', 's'):
697 codec_type = AVMEDIA_TYPE_DATA;
698 break;
699 default:
700 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
701 }
702
703 if (ast->sample_size < 0) {
704 if (s->error_recognition & AV_EF_EXPLODE) {
705 av_log(s, AV_LOG_ERROR,
706 "Invalid sample_size %d at stream %d\n",
707 ast->sample_size,
708 stream_index);
709 goto fail;
710 }
711 av_log(s, AV_LOG_WARNING,
712 "Invalid sample_size %d at stream %d "
713 "setting it to 0\n",
714 ast->sample_size,
715 stream_index);
716 ast->sample_size = 0;
717 }
718
719 if (ast->sample_size == 0) {
720 st->duration = st->nb_frames;
721 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
722 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
723 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
724 }
725 }
726 ast->frame_offset = ast->cum_len;
727 avio_skip(pb, size - 12 * 4);
728 break;
729 case MKTAG('s', 't', 'r', 'f'):
730 /* stream header */
731 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
732 codec_type == AVMEDIA_TYPE_VIDEO))
733 break;
734 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
735 avio_skip(pb, size);
736 } else {
737 uint64_t cur_pos = avio_tell(pb);
738 unsigned esize;
739 if (cur_pos < list_end)
740 size = FFMIN(size, list_end - cur_pos);
741 st = s->streams[stream_index];
742 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
743 avio_skip(pb, size);
744 break;
745 }
746 switch (codec_type) {
747 case AVMEDIA_TYPE_VIDEO:
748 if (amv_file_format) {
749 st->codecpar->width = avih_width;
750 st->codecpar->height = avih_height;
751 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
752 st->codecpar->codec_id = AV_CODEC_ID_AMV;
753 avio_skip(pb, size);
754 break;
755 }
756 tag1 = ff_get_bmp_header(pb, st, &esize);
757
758 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
759 tag1 == MKTAG('D', 'X', 'S', 'A')) {
760 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
761 st->codecpar->codec_tag = tag1;
762 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
763 break;
764 }
765
766 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
767 if (esize == size-1 && (esize&1)) {
768 st->codecpar->extradata_size = esize - 10 * 4;
769 } else
770 st->codecpar->extradata_size = size - 10 * 4;
771 if (st->codecpar->extradata) {
772 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
773 }
774 ret = ff_get_extradata(s, st->codecpar, pb,
775 st->codecpar->extradata_size);
776 if (ret < 0)
777 return ret;
778 }
779
780 // FIXME: check if the encoder really did this correctly
781 if (st->codecpar->extradata_size & 1)
782 avio_r8(pb);
783
784 /* Extract palette from extradata if bpp <= 8.
785 * This code assumes that extradata contains only palette.
786 * This is true for all paletted codecs implemented in
787 * FFmpeg. */
788 if (st->codecpar->extradata_size &&
789 (st->codecpar->bits_per_coded_sample <= 8)) {
790 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
791 const uint8_t *pal_src;
792
793 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
794 pal_src = st->codecpar->extradata +
795 st->codecpar->extradata_size - pal_size;
796 /* Exclude the "BottomUp" field from the palette */
797 if (pal_src - st->codecpar->extradata >= 9 &&
798 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
799 pal_src -= 9;
800 for (i = 0; i < pal_size / 4; i++)
801 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
802 ast->has_pal = 1;
803 }
804
805 print_tag(s, "video", tag1, 0);
806
807 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
808 st->codecpar->codec_tag = tag1;
809 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
810 tag1);
811 /* If codec is not found yet, try with the mov tags. */
812 if (!st->codecpar->codec_id) {
813 st->codecpar->codec_id =
814 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
815 if (st->codecpar->codec_id)
816 av_log(s, AV_LOG_WARNING,
817 "mov tag found in avi (fourcc %s)\n",
818 av_fourcc2str(tag1));
819 }
820 if (!st->codecpar->codec_id)
821 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
822
823 /* This is needed to get the pict type which is necessary
824 * for generating correct pts. */
825 st->need_parsing = AVSTREAM_PARSE_HEADERS;
826
827 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
828 ast->handler == MKTAG('X', 'V', 'I', 'D'))
829 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
830
831 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
832 st->need_parsing = AVSTREAM_PARSE_FULL;
833 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
834 st->need_parsing = AVSTREAM_PARSE_NONE;
835
836 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
837 st->codecpar->extradata_size < 1U << 30) {
838 st->codecpar->extradata_size += 9;
839 if ((ret = av_reallocp(&st->codecpar->extradata,
840 st->codecpar->extradata_size +
841 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
842 st->codecpar->extradata_size = 0;
843 return ret;
844 } else
845 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
846 "BottomUp", 9);
847 }
848 st->codecpar->height = FFABS(st->codecpar->height);
849
850 // avio_skip(pb, size - 5 * 4);
851 break;
852 case AVMEDIA_TYPE_AUDIO:
853 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
854 if (ret < 0)
855 return ret;
856 ast->dshow_block_align = st->codecpar->block_align;
857 if (ast->sample_size && st->codecpar->block_align &&
858 ast->sample_size != st->codecpar->block_align) {
859 av_log(s,
860 AV_LOG_WARNING,
861 "sample size (%d) != block align (%d)\n",
862 ast->sample_size,
863 st->codecpar->block_align);
864 ast->sample_size = st->codecpar->block_align;
865 }
866 /* 2-aligned
867 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
868 if (size & 1)
869 avio_skip(pb, 1);
870 /* Force parsing as several audio frames can be in
871 * one packet and timestamps refer to packet start. */
872 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
873 /* ADTS header is in extradata, AAC without header must be
874 * stored as exact frames. Parser not needed and it will
875 * fail. */
876 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
877 st->codecpar->extradata_size)
878 st->need_parsing = AVSTREAM_PARSE_NONE;
879 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
880 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
881 st->need_parsing = AVSTREAM_PARSE_NONE;
882 /* AVI files with Xan DPCM audio (wrongly) declare PCM
883 * audio in the header but have Axan as stream_code_tag. */
884 if (ast->handler == AV_RL32("Axan")) {
885 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
886 st->codecpar->codec_tag = 0;
887 ast->dshow_block_align = 0;
888 }
889 if (amv_file_format) {
890 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
891 ast->dshow_block_align = 0;
892 }
893 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
894 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
895 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
896 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
897 ast->dshow_block_align = 0;
898 }
899 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
900 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
901 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
902 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
903 ast->sample_size = 0;
904 }
905 break;
906 case AVMEDIA_TYPE_SUBTITLE:
907 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
908 st->request_probe= 1;
909 avio_skip(pb, size);
910 break;
911 default:
912 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
913 st->codecpar->codec_id = AV_CODEC_ID_NONE;
914 st->codecpar->codec_tag = 0;
915 avio_skip(pb, size);
916 break;
917 }
918 }
919 break;
920 case MKTAG('s', 't', 'r', 'd'):
921 if (stream_index >= (unsigned)s->nb_streams
922 || s->streams[stream_index]->codecpar->extradata_size
923 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
924 avio_skip(pb, size);
925 } else {
926 uint64_t cur_pos = avio_tell(pb);
927 if (cur_pos < list_end)
928 size = FFMIN(size, list_end - cur_pos);
929 st = s->streams[stream_index];
930
931 if (size<(1<<30)) {
932 if (st->codecpar->extradata) {
933 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
934 }
935 if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
936 return ret;
937 }
938
939 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
940 avio_r8(pb);
941
942 ret = avi_extract_stream_metadata(s, st);
943 if (ret < 0) {
944 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
945 }
946 }
947 break;
948 case MKTAG('i', 'n', 'd', 'x'):
949 pos = avio_tell(pb);
950 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
951 avi->use_odml &&
952 read_odml_index(s, 0) < 0 &&
953 (s->error_recognition & AV_EF_EXPLODE))
954 goto fail;
955 avio_seek(pb, pos + size, SEEK_SET);
956 break;
957 case MKTAG('v', 'p', 'r', 'p'):
958 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
959 AVRational active, active_aspect;
960
961 st = s->streams[stream_index];
962 avio_rl32(pb);
963 avio_rl32(pb);
964 avio_rl32(pb);
965 avio_rl32(pb);
966 avio_rl32(pb);
967
968 active_aspect.den = avio_rl16(pb);
969 active_aspect.num = avio_rl16(pb);
970 active.num = avio_rl32(pb);
971 active.den = avio_rl32(pb);
972 avio_rl32(pb); // nbFieldsPerFrame
973
974 if (active_aspect.num && active_aspect.den &&
975 active.num && active.den) {
976 st->sample_aspect_ratio = av_div_q(active_aspect, active);
977 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
978 active_aspect.num, active_aspect.den,
979 active.num, active.den);
980 }
981 size -= 9 * 4;
982 }
983 avio_skip(pb, size);
984 break;
985 case MKTAG('s', 't', 'r', 'n'):
986 if (s->nb_streams) {
987 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
988 if (ret < 0)
989 return ret;
990 break;
991 }
992 default:
993 if (size > 1000000) {
994 av_log(s, AV_LOG_ERROR,
995 "Something went wrong during header parsing, "
996 "tag %s has size %u, "
997 "I will ignore it and try to continue anyway.\n",
998 av_fourcc2str(tag), size);
999 if (s->error_recognition & AV_EF_EXPLODE)
1000 goto fail;
1001 avi->movi_list = avio_tell(pb) - 4;
1002 avi->movi_end = avi->fsize;
1003 goto end_of_header;
1004 }
1005 /* Do not fail for very large idx1 tags */
1006 case MKTAG('i', 'd', 'x', '1'):
1007 /* skip tag */
1008 size += (size & 1);
1009 avio_skip(pb, size);
1010 break;
1011 }
1012 }
1013
1014 end_of_header:
1015 /* check stream number */
1016 if (stream_index != s->nb_streams - 1) {
1017
1018 fail:
1019 return AVERROR_INVALIDDATA;
1020 }
1021
1022 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1023 avi_load_index(s);
1024 calculate_bitrate(s);
1025 avi->index_loaded |= 1;
1026
1027 if ((ret = guess_ni_flag(s)) < 0)
1028 return ret;
1029
1030 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1031
1032 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1033 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1034 for (i = 0; i < s->nb_streams; i++) {
1035 AVStream *st = s->streams[i];
1036 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1037 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1038 st->need_parsing = AVSTREAM_PARSE_FULL;
1039 }
1040
1041 for (i = 0; i < s->nb_streams; i++) {
1042 AVStream *st = s->streams[i];
1043 if (st->nb_index_entries)
1044 break;
1045 }
1046 // DV-in-AVI cannot be non-interleaved, if set this must be
1047 // a mis-detection.
1048 if (avi->dv_demux)
1049 avi->non_interleaved = 0;
1050 if (i == s->nb_streams && avi->non_interleaved) {
1051 av_log(s, AV_LOG_WARNING,
1052 "Non-interleaved AVI without index, switching to interleaved\n");
1053 avi->non_interleaved = 0;
1054 }
1055
1056 if (avi->non_interleaved) {
1057 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1058 clean_index(s);
1059 }
1060
1061 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1062 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1063
1064 return 0;
1065 }
1066
read_gab2_sub(AVFormatContext * s,AVStream * st,AVPacket * pkt)1067 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1068 {
1069 if (pkt->size >= 7 &&
1070 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1071 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1072 uint8_t desc[256];
1073 int score = AVPROBE_SCORE_EXTENSION, ret;
1074 AVIStream *ast = st->priv_data;
1075 ff_const59 AVInputFormat *sub_demuxer;
1076 AVRational time_base;
1077 int size;
1078 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1079 pkt->size - 7,
1080 0, NULL, NULL, NULL, NULL);
1081 AVProbeData pd;
1082 unsigned int desc_len = avio_rl32(pb);
1083
1084 if (desc_len > pb->buf_end - pb->buf_ptr)
1085 goto error;
1086
1087 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1088 avio_skip(pb, desc_len - ret);
1089 if (*desc)
1090 av_dict_set(&st->metadata, "title", desc, 0);
1091
1092 avio_rl16(pb); /* flags? */
1093 avio_rl32(pb); /* data size */
1094
1095 size = pb->buf_end - pb->buf_ptr;
1096 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1097 .buf_size = size };
1098 if (!pd.buf)
1099 goto error;
1100 memcpy(pd.buf, pb->buf_ptr, size);
1101 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1102 av_freep(&pd.buf);
1103 if (!sub_demuxer)
1104 goto error;
1105
1106 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1107 goto error;
1108
1109 if (!(ast->sub_ctx = avformat_alloc_context()))
1110 goto error;
1111
1112 ast->sub_ctx->pb = pb;
1113
1114 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1115 goto error;
1116
1117 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1118 if (ast->sub_ctx->nb_streams != 1)
1119 goto error;
1120 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1121 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1122 time_base = ast->sub_ctx->streams[0]->time_base;
1123 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1124 }
1125 ast->sub_buffer = pkt->data;
1126 memset(pkt, 0, sizeof(*pkt));
1127 return 1;
1128
1129 error:
1130 av_freep(&ast->sub_ctx);
1131 avio_context_free(&pb);
1132 }
1133 return 0;
1134 }
1135
get_subtitle_pkt(AVFormatContext * s,AVStream * next_st,AVPacket * pkt)1136 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1137 AVPacket *pkt)
1138 {
1139 AVIStream *ast, *next_ast = next_st->priv_data;
1140 int64_t ts, next_ts, ts_min = INT64_MAX;
1141 AVStream *st, *sub_st = NULL;
1142 int i;
1143
1144 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1145 AV_TIME_BASE_Q);
1146
1147 for (i = 0; i < s->nb_streams; i++) {
1148 st = s->streams[i];
1149 ast = st->priv_data;
1150 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1151 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1152 if (ts <= next_ts && ts < ts_min) {
1153 ts_min = ts;
1154 sub_st = st;
1155 }
1156 }
1157 }
1158
1159 if (sub_st) {
1160 ast = sub_st->priv_data;
1161 *pkt = ast->sub_pkt;
1162 pkt->stream_index = sub_st->index;
1163
1164 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1165 ast->sub_pkt.data = NULL;
1166 }
1167 return sub_st;
1168 }
1169
get_stream_idx(const unsigned * d)1170 static int get_stream_idx(const unsigned *d)
1171 {
1172 if (d[0] >= '0' && d[0] <= '9' &&
1173 d[1] >= '0' && d[1] <= '9') {
1174 return (d[0] - '0') * 10 + (d[1] - '0');
1175 } else {
1176 return 100; // invalid stream ID
1177 }
1178 }
1179
1180 /**
1181 *
1182 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1183 */
avi_sync(AVFormatContext * s,int exit_early)1184 static int avi_sync(AVFormatContext *s, int exit_early)
1185 {
1186 AVIContext *avi = s->priv_data;
1187 AVIOContext *pb = s->pb;
1188 int n;
1189 unsigned int d[8];
1190 unsigned int size;
1191 int64_t i, sync;
1192
1193 start_sync:
1194 memset(d, -1, sizeof(d));
1195 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1196 int j;
1197
1198 for (j = 0; j < 7; j++)
1199 d[j] = d[j + 1];
1200 d[7] = avio_r8(pb);
1201
1202 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1203
1204 n = get_stream_idx(d + 2);
1205 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1206 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1207 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1208 continue;
1209
1210 // parse ix##
1211 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1212 // parse JUNK
1213 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1214 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1215 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1216 avio_skip(pb, size);
1217 goto start_sync;
1218 }
1219
1220 // parse stray LIST
1221 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1222 avio_skip(pb, 4);
1223 goto start_sync;
1224 }
1225
1226 n = get_stream_idx(d);
1227
1228 if (!((i - avi->last_pkt_pos) & 1) &&
1229 get_stream_idx(d + 1) < s->nb_streams)
1230 continue;
1231
1232 // detect ##ix chunk and skip
1233 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1234 avio_skip(pb, size);
1235 goto start_sync;
1236 }
1237
1238 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1239 avio_skip(pb, 16 * 3 + 8);
1240 goto start_sync;
1241 }
1242
1243 if (avi->dv_demux && n != 0)
1244 continue;
1245
1246 // parse ##dc/##wb
1247 if (n < s->nb_streams) {
1248 AVStream *st;
1249 AVIStream *ast;
1250 st = s->streams[n];
1251 ast = st->priv_data;
1252
1253 if (!ast) {
1254 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1255 continue;
1256 }
1257
1258 if (s->nb_streams >= 2) {
1259 AVStream *st1 = s->streams[1];
1260 AVIStream *ast1 = st1->priv_data;
1261 // workaround for broken small-file-bug402.avi
1262 if ( d[2] == 'w' && d[3] == 'b'
1263 && n == 0
1264 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1265 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1266 && ast->prefix == 'd'*256+'c'
1267 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1268 ) {
1269 n = 1;
1270 st = st1;
1271 ast = ast1;
1272 av_log(s, AV_LOG_WARNING,
1273 "Invalid stream + prefix combination, assuming audio.\n");
1274 }
1275 }
1276
1277 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1278 int k = avio_r8(pb);
1279 int last = (k + avio_r8(pb) - 1) & 0xFF;
1280
1281 avio_rl16(pb); // flags
1282
1283 // b + (g << 8) + (r << 16);
1284 for (; k <= last; k++)
1285 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1286
1287 ast->has_pal = 1;
1288 goto start_sync;
1289 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1290 d[2] < 128 && d[3] < 128) ||
1291 d[2] * 256 + d[3] == ast->prefix /* ||
1292 (d[2] == 'd' && d[3] == 'c') ||
1293 (d[2] == 'w' && d[3] == 'b') */) {
1294 if (exit_early)
1295 return 0;
1296 if (d[2] * 256 + d[3] == ast->prefix)
1297 ast->prefix_count++;
1298 else {
1299 ast->prefix = d[2] * 256 + d[3];
1300 ast->prefix_count = 0;
1301 }
1302
1303 if (!avi->dv_demux &&
1304 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1305 // FIXME: needs a little reordering
1306 (st->discard >= AVDISCARD_NONKEY &&
1307 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1308 || st->discard >= AVDISCARD_ALL)) {
1309
1310 ast->frame_offset += get_duration(ast, size);
1311 avio_skip(pb, size);
1312 goto start_sync;
1313 }
1314
1315 avi->stream_index = n;
1316 ast->packet_size = size + 8;
1317 ast->remaining = size;
1318
1319 if (size) {
1320 uint64_t pos = avio_tell(pb) - 8;
1321 if (!st->index_entries || !st->nb_index_entries ||
1322 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1323 av_add_index_entry(st, pos, ast->frame_offset, size,
1324 0, AVINDEX_KEYFRAME);
1325 }
1326 }
1327 return 0;
1328 }
1329 }
1330 }
1331
1332 if (pb->error)
1333 return pb->error;
1334 return AVERROR_EOF;
1335 }
1336
ni_prepare_read(AVFormatContext * s)1337 static int ni_prepare_read(AVFormatContext *s)
1338 {
1339 AVIContext *avi = s->priv_data;
1340 int best_stream_index = 0;
1341 AVStream *best_st = NULL;
1342 AVIStream *best_ast;
1343 int64_t best_ts = INT64_MAX;
1344 int i;
1345
1346 for (i = 0; i < s->nb_streams; i++) {
1347 AVStream *st = s->streams[i];
1348 AVIStream *ast = st->priv_data;
1349 int64_t ts = ast->frame_offset;
1350 int64_t last_ts;
1351
1352 if (!st->nb_index_entries)
1353 continue;
1354
1355 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1356 if (!ast->remaining && ts > last_ts)
1357 continue;
1358
1359 ts = av_rescale_q(ts, st->time_base,
1360 (AVRational) { FFMAX(1, ast->sample_size),
1361 AV_TIME_BASE });
1362
1363 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1364 st->time_base.num, st->time_base.den, ast->frame_offset);
1365 if (ts < best_ts) {
1366 best_ts = ts;
1367 best_st = st;
1368 best_stream_index = i;
1369 }
1370 }
1371 if (!best_st)
1372 return AVERROR_EOF;
1373
1374 best_ast = best_st->priv_data;
1375 best_ts = best_ast->frame_offset;
1376 if (best_ast->remaining) {
1377 i = av_index_search_timestamp(best_st,
1378 best_ts,
1379 AVSEEK_FLAG_ANY |
1380 AVSEEK_FLAG_BACKWARD);
1381 } else {
1382 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1383 if (i >= 0)
1384 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1385 }
1386
1387 if (i >= 0) {
1388 int64_t pos = best_st->index_entries[i].pos;
1389 pos += best_ast->packet_size - best_ast->remaining;
1390 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1391 return AVERROR_EOF;
1392
1393 av_assert0(best_ast->remaining <= best_ast->packet_size);
1394
1395 avi->stream_index = best_stream_index;
1396 if (!best_ast->remaining)
1397 best_ast->packet_size =
1398 best_ast->remaining = best_st->index_entries[i].size;
1399 }
1400 else
1401 return AVERROR_EOF;
1402
1403 return 0;
1404 }
1405
avi_read_packet(AVFormatContext * s,AVPacket * pkt)1406 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1407 {
1408 AVIContext *avi = s->priv_data;
1409 AVIOContext *pb = s->pb;
1410 int err;
1411
1412 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1413 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1414 if (size >= 0)
1415 return size;
1416 else
1417 goto resync;
1418 }
1419
1420 if (avi->non_interleaved) {
1421 err = ni_prepare_read(s);
1422 if (err < 0)
1423 return err;
1424 }
1425
1426 resync:
1427 if (avi->stream_index >= 0) {
1428 AVStream *st = s->streams[avi->stream_index];
1429 AVIStream *ast = st->priv_data;
1430 int size, err;
1431
1432 if (get_subtitle_pkt(s, st, pkt))
1433 return 0;
1434
1435 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1436 if (ast->sample_size <= 1)
1437 size = INT_MAX;
1438 else if (ast->sample_size < 32)
1439 // arbitrary multiplier to avoid tiny packets for raw PCM data
1440 size = 1024 * ast->sample_size;
1441 else
1442 size = ast->sample_size;
1443
1444 if (size > ast->remaining)
1445 size = ast->remaining;
1446 avi->last_pkt_pos = avio_tell(pb);
1447 err = av_get_packet(pb, pkt, size);
1448 if (err < 0)
1449 return err;
1450 size = err;
1451
1452 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1453 uint8_t *pal;
1454 pal = av_packet_new_side_data(pkt,
1455 AV_PKT_DATA_PALETTE,
1456 AVPALETTE_SIZE);
1457 if (!pal) {
1458 av_log(s, AV_LOG_ERROR,
1459 "Failed to allocate data for palette\n");
1460 } else {
1461 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1462 ast->has_pal = 0;
1463 }
1464 }
1465
1466 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1467 AVBufferRef *avbuf = pkt->buf;
1468 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1469 pkt->data, pkt->size, pkt->pos);
1470 pkt->buf = avbuf;
1471 pkt->flags |= AV_PKT_FLAG_KEY;
1472 if (size < 0)
1473 av_packet_unref(pkt);
1474 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1475 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1476 ast->frame_offset++;
1477 avi->stream_index = -1;
1478 ast->remaining = 0;
1479 goto resync;
1480 } else {
1481 /* XXX: How to handle B-frames in AVI? */
1482 pkt->dts = ast->frame_offset;
1483 // pkt->dts += ast->start;
1484 if (ast->sample_size)
1485 pkt->dts /= ast->sample_size;
1486 pkt->stream_index = avi->stream_index;
1487
1488 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1489 AVIndexEntry *e;
1490 int index;
1491
1492 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1493 e = &st->index_entries[index];
1494
1495 if (index >= 0 && e->timestamp == ast->frame_offset) {
1496 if (index == st->nb_index_entries-1) {
1497 int key=1;
1498 uint32_t state=-1;
1499 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1500 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1501 while (ptr < end) {
1502 ptr = avpriv_find_start_code(ptr, end, &state);
1503 if (state == 0x1B6 && ptr < end) {
1504 key = !(*ptr & 0xC0);
1505 break;
1506 }
1507 }
1508 }
1509 if (!key)
1510 e->flags &= ~AVINDEX_KEYFRAME;
1511 }
1512 if (e->flags & AVINDEX_KEYFRAME)
1513 pkt->flags |= AV_PKT_FLAG_KEY;
1514 }
1515 } else {
1516 pkt->flags |= AV_PKT_FLAG_KEY;
1517 }
1518 ast->frame_offset += get_duration(ast, pkt->size);
1519 }
1520 ast->remaining -= err;
1521 if (!ast->remaining) {
1522 avi->stream_index = -1;
1523 ast->packet_size = 0;
1524 }
1525
1526 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1527 av_packet_unref(pkt);
1528 goto resync;
1529 }
1530 ast->seek_pos= 0;
1531
1532 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1533 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1534
1535 if (avi->dts_max < dts) {
1536 avi->dts_max = dts;
1537 } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1538 avi->non_interleaved= 1;
1539 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1540 }
1541 }
1542
1543 return 0;
1544 }
1545
1546 if ((err = avi_sync(s, 0)) < 0)
1547 return err;
1548 goto resync;
1549 }
1550
1551 /* XXX: We make the implicit supposition that the positions are sorted
1552 * for each stream. */
avi_read_idx1(AVFormatContext * s,int size)1553 static int avi_read_idx1(AVFormatContext *s, int size)
1554 {
1555 AVIContext *avi = s->priv_data;
1556 AVIOContext *pb = s->pb;
1557 int nb_index_entries, i;
1558 AVStream *st;
1559 AVIStream *ast;
1560 int64_t pos;
1561 unsigned int index, tag, flags, len, first_packet = 1;
1562 int64_t last_pos = -1;
1563 unsigned last_idx = -1;
1564 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1565 int anykey = 0;
1566
1567 nb_index_entries = size / 16;
1568 if (nb_index_entries <= 0)
1569 return AVERROR_INVALIDDATA;
1570
1571 idx1_pos = avio_tell(pb);
1572 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1573 if (avi_sync(s, 1) == 0)
1574 first_packet_pos = avio_tell(pb) - 8;
1575 avi->stream_index = -1;
1576 avio_seek(pb, idx1_pos, SEEK_SET);
1577
1578 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1579 first_packet_pos = 0;
1580 data_offset = avi->movi_list;
1581 }
1582
1583 /* Read the entries and sort them in each stream component. */
1584 for (i = 0; i < nb_index_entries; i++) {
1585 if (avio_feof(pb))
1586 return -1;
1587
1588 tag = avio_rl32(pb);
1589 flags = avio_rl32(pb);
1590 pos = avio_rl32(pb);
1591 len = avio_rl32(pb);
1592 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1593 i, tag, flags, pos, len);
1594
1595 index = ((tag & 0xff) - '0') * 10;
1596 index += (tag >> 8 & 0xff) - '0';
1597 if (index >= s->nb_streams)
1598 continue;
1599 st = s->streams[index];
1600 ast = st->priv_data;
1601
1602 /* Skip 'xxpc' palette change entries in the index until a logic
1603 * to process these is properly implemented. */
1604 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1605 continue;
1606
1607 if (first_packet && first_packet_pos) {
1608 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1609 data_offset = first_packet_pos - pos;
1610 first_packet = 0;
1611 }
1612 pos += data_offset;
1613
1614 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1615
1616 // even if we have only a single stream, we should
1617 // switch to non-interleaved to get correct timestamps
1618 if (last_pos == pos)
1619 avi->non_interleaved = 1;
1620 if (last_idx != pos && len) {
1621 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1622 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1623 last_idx= pos;
1624 }
1625 ast->cum_len += get_duration(ast, len);
1626 last_pos = pos;
1627 anykey |= flags&AVIIF_INDEX;
1628 }
1629 if (!anykey) {
1630 for (index = 0; index < s->nb_streams; index++) {
1631 st = s->streams[index];
1632 if (st->nb_index_entries)
1633 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1634 }
1635 }
1636 return 0;
1637 }
1638
1639 /* Scan the index and consider any file with streams more than
1640 * 2 seconds or 64MB apart non-interleaved. */
check_stream_max_drift(AVFormatContext * s)1641 static int check_stream_max_drift(AVFormatContext *s)
1642 {
1643 int64_t min_pos, pos;
1644 int i;
1645 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1646 if (!idx)
1647 return AVERROR(ENOMEM);
1648 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1649 int64_t max_dts = INT64_MIN / 2;
1650 int64_t min_dts = INT64_MAX / 2;
1651 int64_t max_buffer = 0;
1652
1653 min_pos = INT64_MAX;
1654
1655 for (i = 0; i < s->nb_streams; i++) {
1656 AVStream *st = s->streams[i];
1657 AVIStream *ast = st->priv_data;
1658 int n = st->nb_index_entries;
1659 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1660 idx[i]++;
1661 if (idx[i] < n) {
1662 int64_t dts;
1663 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1664 FFMAX(ast->sample_size, 1),
1665 st->time_base, AV_TIME_BASE_Q);
1666 min_dts = FFMIN(min_dts, dts);
1667 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1668 }
1669 }
1670 for (i = 0; i < s->nb_streams; i++) {
1671 AVStream *st = s->streams[i];
1672 AVIStream *ast = st->priv_data;
1673
1674 if (idx[i] && min_dts != INT64_MAX / 2) {
1675 int64_t dts;
1676 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1677 FFMAX(ast->sample_size, 1),
1678 st->time_base, AV_TIME_BASE_Q);
1679 max_dts = FFMAX(max_dts, dts);
1680 max_buffer = FFMAX(max_buffer,
1681 av_rescale(dts - min_dts,
1682 st->codecpar->bit_rate,
1683 AV_TIME_BASE));
1684 }
1685 }
1686 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1687 max_buffer > 1024 * 1024 * 8 * 8) {
1688 av_free(idx);
1689 return 1;
1690 }
1691 }
1692 av_free(idx);
1693 return 0;
1694 }
1695
guess_ni_flag(AVFormatContext * s)1696 static int guess_ni_flag(AVFormatContext *s)
1697 {
1698 int i;
1699 int64_t last_start = 0;
1700 int64_t first_end = INT64_MAX;
1701 int64_t oldpos = avio_tell(s->pb);
1702
1703 for (i = 0; i < s->nb_streams; i++) {
1704 AVStream *st = s->streams[i];
1705 int n = st->nb_index_entries;
1706 unsigned int size;
1707
1708 if (n <= 0)
1709 continue;
1710
1711 if (n >= 2) {
1712 int64_t pos = st->index_entries[0].pos;
1713 unsigned tag[2];
1714 avio_seek(s->pb, pos, SEEK_SET);
1715 tag[0] = avio_r8(s->pb);
1716 tag[1] = avio_r8(s->pb);
1717 avio_rl16(s->pb);
1718 size = avio_rl32(s->pb);
1719 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1720 last_start = INT64_MAX;
1721 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1722 last_start = INT64_MAX;
1723 }
1724
1725 if (st->index_entries[0].pos > last_start)
1726 last_start = st->index_entries[0].pos;
1727 if (st->index_entries[n - 1].pos < first_end)
1728 first_end = st->index_entries[n - 1].pos;
1729 }
1730 avio_seek(s->pb, oldpos, SEEK_SET);
1731
1732 if (last_start > first_end)
1733 return 1;
1734
1735 return check_stream_max_drift(s);
1736 }
1737
avi_load_index(AVFormatContext * s)1738 static int avi_load_index(AVFormatContext *s)
1739 {
1740 AVIContext *avi = s->priv_data;
1741 AVIOContext *pb = s->pb;
1742 uint32_t tag, size;
1743 int64_t pos = avio_tell(pb);
1744 int64_t next;
1745 int ret = -1;
1746
1747 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1748 goto the_end; // maybe truncated file
1749 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1750 for (;;) {
1751 tag = avio_rl32(pb);
1752 size = avio_rl32(pb);
1753 if (avio_feof(pb))
1754 break;
1755 next = avio_tell(pb) + size + (size & 1);
1756
1757 if (tag == MKTAG('i', 'd', 'x', '1') &&
1758 avi_read_idx1(s, size) >= 0) {
1759 avi->index_loaded=2;
1760 ret = 0;
1761 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1762 uint32_t tag1 = avio_rl32(pb);
1763
1764 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1765 ff_read_riff_info(s, size - 4);
1766 }else if (!ret)
1767 break;
1768
1769 if (avio_seek(pb, next, SEEK_SET) < 0)
1770 break; // something is wrong here
1771 }
1772
1773 the_end:
1774 avio_seek(pb, pos, SEEK_SET);
1775 return ret;
1776 }
1777
seek_subtitle(AVStream * st,AVStream * st2,int64_t timestamp)1778 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1779 {
1780 AVIStream *ast2 = st2->priv_data;
1781 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1782 av_packet_unref(&ast2->sub_pkt);
1783 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1784 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1785 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1786 }
1787
avi_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)1788 static int avi_read_seek(AVFormatContext *s, int stream_index,
1789 int64_t timestamp, int flags)
1790 {
1791 AVIContext *avi = s->priv_data;
1792 AVStream *st;
1793 int i, index;
1794 int64_t pos, pos_min;
1795 AVIStream *ast;
1796
1797 /* Does not matter which stream is requested dv in avi has the
1798 * stream information in the first video stream.
1799 */
1800 if (avi->dv_demux)
1801 stream_index = 0;
1802
1803 if (!avi->index_loaded) {
1804 /* we only load the index on demand */
1805 avi_load_index(s);
1806 avi->index_loaded |= 1;
1807 }
1808 av_assert0(stream_index >= 0);
1809
1810 st = s->streams[stream_index];
1811 ast = st->priv_data;
1812 index = av_index_search_timestamp(st,
1813 timestamp * FFMAX(ast->sample_size, 1),
1814 flags);
1815 if (index < 0) {
1816 if (st->nb_index_entries > 0)
1817 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1818 timestamp * FFMAX(ast->sample_size, 1),
1819 st->index_entries[0].timestamp,
1820 st->index_entries[st->nb_index_entries - 1].timestamp);
1821 return AVERROR_INVALIDDATA;
1822 }
1823
1824 /* find the position */
1825 pos = st->index_entries[index].pos;
1826 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1827
1828 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1829 timestamp, index, st->index_entries[index].timestamp);
1830
1831 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1832 /* One and only one real stream for DV in AVI, and it has video */
1833 /* offsets. Calling with other stream indexes should have failed */
1834 /* the av_index_search_timestamp call above. */
1835
1836 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1837 return -1;
1838
1839 /* Feed the DV video stream version of the timestamp to the */
1840 /* DV demux so it can synthesize correct timestamps. */
1841 ff_dv_offset_reset(avi->dv_demux, timestamp);
1842
1843 avi->stream_index = -1;
1844 return 0;
1845 }
1846
1847 pos_min = pos;
1848 for (i = 0; i < s->nb_streams; i++) {
1849 AVStream *st2 = s->streams[i];
1850 AVIStream *ast2 = st2->priv_data;
1851
1852 ast2->packet_size =
1853 ast2->remaining = 0;
1854
1855 if (ast2->sub_ctx) {
1856 seek_subtitle(st, st2, timestamp);
1857 continue;
1858 }
1859
1860 if (st2->nb_index_entries <= 0)
1861 continue;
1862
1863 // av_assert1(st2->codecpar->block_align);
1864 index = av_index_search_timestamp(st2,
1865 av_rescale_q(timestamp,
1866 st->time_base,
1867 st2->time_base) *
1868 FFMAX(ast2->sample_size, 1),
1869 flags |
1870 AVSEEK_FLAG_BACKWARD |
1871 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1872 if (index < 0)
1873 index = 0;
1874 ast2->seek_pos = st2->index_entries[index].pos;
1875 pos_min = FFMIN(pos_min,ast2->seek_pos);
1876 }
1877 for (i = 0; i < s->nb_streams; i++) {
1878 AVStream *st2 = s->streams[i];
1879 AVIStream *ast2 = st2->priv_data;
1880
1881 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1882 continue;
1883
1884 index = av_index_search_timestamp(
1885 st2,
1886 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1887 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1888 if (index < 0)
1889 index = 0;
1890 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1891 index--;
1892 ast2->frame_offset = st2->index_entries[index].timestamp;
1893 }
1894
1895 /* do the seek */
1896 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1897 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1898 return -1;
1899 }
1900 avi->stream_index = -1;
1901 avi->dts_max = INT_MIN;
1902 return 0;
1903 }
1904
avi_read_close(AVFormatContext * s)1905 static int avi_read_close(AVFormatContext *s)
1906 {
1907 int i;
1908 AVIContext *avi = s->priv_data;
1909
1910 for (i = 0; i < s->nb_streams; i++) {
1911 AVStream *st = s->streams[i];
1912 AVIStream *ast = st->priv_data;
1913 if (ast) {
1914 if (ast->sub_ctx) {
1915 av_freep(&ast->sub_ctx->pb);
1916 avformat_close_input(&ast->sub_ctx);
1917 }
1918 av_freep(&ast->sub_buffer);
1919 av_packet_unref(&ast->sub_pkt);
1920 }
1921 }
1922
1923 av_freep(&avi->dv_demux);
1924
1925 return 0;
1926 }
1927
avi_probe(const AVProbeData * p)1928 static int avi_probe(const AVProbeData *p)
1929 {
1930 int i;
1931
1932 /* check file header */
1933 for (i = 0; avi_headers[i][0]; i++)
1934 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1935 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1936 return AVPROBE_SCORE_MAX;
1937
1938 return 0;
1939 }
1940
1941 AVInputFormat ff_avi_demuxer = {
1942 .name = "avi",
1943 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1944 .priv_data_size = sizeof(AVIContext),
1945 .extensions = "avi",
1946 .read_probe = avi_probe,
1947 .read_header = avi_read_header,
1948 .read_packet = avi_read_packet,
1949 .read_close = avi_read_close,
1950 .read_seek = avi_read_seek,
1951 .priv_class = &demuxer_class,
1952 };
1953