3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avassert.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/bswap.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mathematics.h"
36 typedef struct AVIStream {
37 int64_t frame_offset; /* current frame (video) or byte (audio) counter
38 * (used to compute the pts) */
44 int sample_size; /* size of one sample (or packet)
45 * (in the rate/scale sense) in bytes */
47 int64_t cum_len; /* temporary storage (used during seek) */
48 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
52 int dshow_block_align; /* block align variable used to emulate bugs in
53 * the MS dshow demuxer */
55 AVFormatContext *sub_ctx;
74 DVDemuxContext *dv_demux;
77 #define MAX_ODML_DEPTH 1000
82 static const AVOption options[] = {
83 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
87 static const AVClass demuxer_class = {
89 .item_name = av_default_item_name,
91 .version = LIBAVUTIL_VERSION_INT,
92 .category = AV_CLASS_CATEGORY_DEMUXER,
96 static const char avi_headers[][8] = {
97 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
98 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
99 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
100 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
101 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
105 static const AVMetadataConv avi_metadata_conv[] = {
110 static int avi_load_index(AVFormatContext *s);
111 static int guess_ni_flag(AVFormatContext *s);
113 #define print_tag(str, tag, size) \
114 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
117 (tag >> 16) & 0xff, \
118 (tag >> 24) & 0xff, \
121 static inline int get_duration(AVIStream *ast, int len)
123 if (ast->sample_size)
125 else if (ast->dshow_block_align)
126 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
131 static int get_riff(AVFormatContext *s, AVIOContext *pb)
133 AVIContext *avi = s->priv_data;
137 /* check RIFF header */
138 avio_read(pb, header, 4);
139 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
140 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
141 avio_read(pb, header + 4, 4);
143 for (i = 0; avi_headers[i][0]; i++)
144 if (!memcmp(header, avi_headers[i], 8))
146 if (!avi_headers[i][0])
147 return AVERROR_INVALIDDATA;
149 if (header[7] == 0x19)
150 av_log(s, AV_LOG_INFO,
151 "This file has been generated by a totally broken muxer.\n");
156 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
158 AVIContext *avi = s->priv_data;
159 AVIOContext *pb = s->pb;
160 int longs_pre_entry = avio_rl16(pb);
161 int index_sub_type = avio_r8(pb);
162 int index_type = avio_r8(pb);
163 int entries_in_use = avio_rl32(pb);
164 int chunk_id = avio_rl32(pb);
165 int64_t base = avio_rl64(pb);
166 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
167 ((chunk_id >> 8 & 0xFF) - '0');
171 int64_t last_pos = -1;
172 int64_t filesize = avi->fsize;
175 "longs_pre_entry:%d index_type:%d entries_in_use:%d "
176 "chunk_id:%X base:%16"PRIX64"\n",
183 if (stream_id >= s->nb_streams || stream_id < 0)
184 return AVERROR_INVALIDDATA;
185 st = s->streams[stream_id];
189 return AVERROR_INVALIDDATA;
193 if (index_type && longs_pre_entry != 2)
194 return AVERROR_INVALIDDATA;
196 return AVERROR_INVALIDDATA;
198 if (filesize > 0 && base >= filesize) {
199 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
200 if (base >> 32 == (base & 0xFFFFFFFF) &&
201 (base & 0xFFFFFFFF) < filesize &&
202 filesize <= 0xFFFFFFFF)
205 return AVERROR_INVALIDDATA;
208 for (i = 0; i < entries_in_use; i++) {
210 int64_t pos = avio_rl32(pb) + base - 8;
211 int len = avio_rl32(pb);
216 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
219 return AVERROR_INVALIDDATA;
221 if (last_pos == pos || pos == base - 8)
222 avi->non_interleaved = 1;
223 if (last_pos != pos && (len || !ast->sample_size))
224 av_add_index_entry(st, pos, ast->cum_len, len, 0,
225 key ? AVINDEX_KEYFRAME : 0);
227 ast->cum_len += get_duration(ast, len);
232 offset = avio_rl64(pb);
233 avio_rl32(pb); /* size */
234 duration = avio_rl32(pb);
237 return AVERROR_INVALIDDATA;
241 if (avi->odml_depth > MAX_ODML_DEPTH) {
242 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
243 return AVERROR_INVALIDDATA;
246 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
249 read_braindead_odml_indx(s, frame_num);
251 frame_num += duration;
253 if (avio_seek(pb, pos, SEEK_SET) < 0) {
254 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
260 avi->index_loaded = 2;
264 static void clean_index(AVFormatContext *s)
269 for (i = 0; i < s->nb_streams; i++) {
270 AVStream *st = s->streams[i];
271 AVIStream *ast = st->priv_data;
272 int n = st->nb_index_entries;
273 int max = ast->sample_size;
274 int64_t pos, size, ts;
276 if (n != 1 || ast->sample_size == 0)
282 pos = st->index_entries[0].pos;
283 size = st->index_entries[0].size;
284 ts = st->index_entries[0].timestamp;
286 for (j = 0; j < size; j += max)
287 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
292 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
295 AVIOContext *pb = s->pb;
301 if (size == UINT_MAX)
302 return AVERROR(EINVAL);
303 value = av_malloc(size + 1);
305 return AVERROR(ENOMEM);
306 avio_read(pb, value, size);
311 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
312 AV_DICT_DONT_STRDUP_VAL);
315 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
316 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
318 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
320 char month[4], time[9], buffer[64];
322 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
323 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
324 month, &day, time, &year) == 4) {
325 for (i = 0; i < 12; i++)
326 if (!av_strcasecmp(month, months[i])) {
327 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
328 year, i + 1, day, time);
329 av_dict_set(metadata, "creation_time", buffer, 0);
331 } else if (date[4] == '/' && date[7] == '/') {
332 date[4] = date[7] = '-';
333 av_dict_set(metadata, "creation_time", date, 0);
337 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
339 while (avio_tell(s->pb) < end) {
340 uint32_t tag = avio_rl32(s->pb);
341 uint32_t size = avio_rl32(s->pb);
343 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
345 uint64_t tag_end = avio_tell(s->pb) + size;
346 while (avio_tell(s->pb) < tag_end) {
347 uint16_t tag = avio_rl16(s->pb);
348 uint16_t size = avio_rl16(s->pb);
349 const char *name = NULL;
350 char buffer[64] = { 0 };
351 size -= avio_read(s->pb, buffer,
352 FFMIN(size, sizeof(buffer) - 1));
361 name = "creation_time";
362 if (buffer[4] == ':' && buffer[7] == ':')
363 buffer[4] = buffer[7] = '-';
367 av_dict_set(&s->metadata, name, buffer, 0);
368 avio_skip(s->pb, size);
373 avio_skip(s->pb, size);
379 static int avi_read_header(AVFormatContext *s)
381 AVIContext *avi = s->priv_data;
382 AVIOContext *pb = s->pb;
383 unsigned int tag, tag1, handler;
384 int codec_type, stream_index, frame_period;
388 AVIStream *ast = NULL;
389 int avih_width = 0, avih_height = 0;
390 int amv_file_format = 0;
391 uint64_t list_end = 0;
393 AVDictionaryEntry *dict_entry;
395 avi->stream_index = -1;
397 ret = get_riff(s, pb);
401 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
403 avi->io_fsize = avi->fsize = avio_size(pb);
404 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
405 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
415 size = avio_rl32(pb);
417 print_tag("tag", tag, size);
420 case MKTAG('L', 'I', 'S', 'T'):
421 list_end = avio_tell(pb) + size;
422 /* Ignored, except at start of video packets. */
423 tag1 = avio_rl32(pb);
425 print_tag("list", tag1, 0);
427 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
428 avi->movi_list = avio_tell(pb) - 4;
430 avi->movi_end = avi->movi_list + size + (size & 1);
432 avi->movi_end = avi->fsize;
433 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
435 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
436 ff_read_riff_info(s, size - 4);
437 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
438 avi_read_nikon(s, list_end);
441 case MKTAG('I', 'D', 'I', 'T'):
443 unsigned char date[64] = { 0 };
445 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
447 avi_metadata_creation_time(&s->metadata, date);
450 case MKTAG('d', 'm', 'l', 'h'):
452 avio_skip(pb, size + (size & 1));
454 case MKTAG('a', 'm', 'v', 'h'):
456 case MKTAG('a', 'v', 'i', 'h'):
458 /* using frame_period is bad idea */
459 frame_period = avio_rl32(pb);
460 avio_rl32(pb); /* max. bytes per second */
462 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
464 avio_skip(pb, 2 * 4);
467 avih_width = avio_rl32(pb);
468 avih_height = avio_rl32(pb);
470 avio_skip(pb, size - 10 * 4);
472 case MKTAG('s', 't', 'r', 'h'):
475 tag1 = avio_rl32(pb);
476 handler = avio_rl32(pb); /* codec tag */
478 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
479 avio_skip(pb, size - 8);
483 st = avformat_new_stream(s, NULL);
487 st->id = stream_index;
488 ast = av_mallocz(sizeof(AVIStream));
494 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
495 : MKTAG('v', 'i', 'd', 's');
497 print_tag("strh", tag1, -1);
499 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
500 tag1 == MKTAG('i', 'v', 'a', 's')) {
503 /* After some consideration -- I don't think we
504 * have to support anything but DV in type1 AVIs. */
505 if (s->nb_streams != 1)
508 if (handler != MKTAG('d', 'v', 's', 'd') &&
509 handler != MKTAG('d', 'v', 'h', 'd') &&
510 handler != MKTAG('d', 'v', 's', 'l'))
513 ast = s->streams[0]->priv_data;
514 av_freep(&s->streams[0]->codec->extradata);
515 av_freep(&s->streams[0]->codec);
516 if (s->streams[0]->info)
517 av_freep(&s->streams[0]->info->duration_error);
518 av_freep(&s->streams[0]->info);
519 av_freep(&s->streams[0]);
521 if (CONFIG_DV_DEMUXER) {
522 avi->dv_demux = avpriv_dv_init_demux(s);
527 s->streams[0]->priv_data = ast;
528 avio_skip(pb, 3 * 4);
529 ast->scale = avio_rl32(pb);
530 ast->rate = avio_rl32(pb);
531 avio_skip(pb, 4); /* start time */
533 dv_dur = avio_rl32(pb);
534 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
535 dv_dur *= AV_TIME_BASE;
536 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
538 /* else, leave duration alone; timing estimation in utils.c
539 * will make a guess based on bitrate. */
541 stream_index = s->nb_streams - 1;
542 avio_skip(pb, size - 9 * 4);
546 av_assert0(stream_index < s->nb_streams);
547 st->codec->stream_codec_tag = handler;
549 avio_rl32(pb); /* flags */
550 avio_rl16(pb); /* priority */
551 avio_rl16(pb); /* language */
552 avio_rl32(pb); /* initial frame */
553 ast->scale = avio_rl32(pb);
554 ast->rate = avio_rl32(pb);
555 if (!(ast->scale && ast->rate)) {
556 av_log(s, AV_LOG_WARNING,
557 "scale/rate is %u/%u which is invalid. "
558 "(This file has been generated by broken software.)\n",
563 ast->scale = frame_period;
569 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
571 ast->cum_len = avio_rl32(pb); /* start */
572 st->nb_frames = avio_rl32(pb);
575 avio_rl32(pb); /* buffer size */
576 avio_rl32(pb); /* quality */
577 if (ast->cum_len*ast->scale/ast->rate > 3600) {
578 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
579 return AVERROR_INVALIDDATA;
581 ast->sample_size = avio_rl32(pb); /* sample ssize */
582 ast->cum_len *= FFMAX(1, ast->sample_size);
583 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
584 ast->rate, ast->scale, ast->sample_size);
587 case MKTAG('v', 'i', 'd', 's'):
588 codec_type = AVMEDIA_TYPE_VIDEO;
590 ast->sample_size = 0;
592 case MKTAG('a', 'u', 'd', 's'):
593 codec_type = AVMEDIA_TYPE_AUDIO;
595 case MKTAG('t', 'x', 't', 's'):
596 codec_type = AVMEDIA_TYPE_SUBTITLE;
598 case MKTAG('d', 'a', 't', 's'):
599 codec_type = AVMEDIA_TYPE_DATA;
602 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
604 if (ast->sample_size == 0) {
605 st->duration = st->nb_frames;
606 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
607 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
608 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
611 ast->frame_offset = ast->cum_len;
612 avio_skip(pb, size - 12 * 4);
614 case MKTAG('s', 't', 'r', 'f'):
618 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
621 uint64_t cur_pos = avio_tell(pb);
623 if (cur_pos < list_end)
624 size = FFMIN(size, list_end - cur_pos);
625 st = s->streams[stream_index];
626 switch (codec_type) {
627 case AVMEDIA_TYPE_VIDEO:
628 if (amv_file_format) {
629 st->codec->width = avih_width;
630 st->codec->height = avih_height;
631 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
632 st->codec->codec_id = AV_CODEC_ID_AMV;
636 tag1 = ff_get_bmp_header(pb, st, &esize);
638 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
639 tag1 == MKTAG('D', 'X', 'S', 'A')) {
640 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
641 st->codec->codec_tag = tag1;
642 st->codec->codec_id = AV_CODEC_ID_XSUB;
646 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
647 if (esize == size-1 && (esize&1)) {
648 st->codec->extradata_size = esize - 10 * 4;
650 st->codec->extradata_size = size - 10 * 4;
651 if (ff_alloc_extradata(st->codec, st->codec->extradata_size))
652 return AVERROR(ENOMEM);
654 st->codec->extradata,
655 st->codec->extradata_size);
658 // FIXME: check if the encoder really did this correctly
659 if (st->codec->extradata_size & 1)
662 /* Extract palette from extradata if bpp <= 8.
663 * This code assumes that extradata contains only palette.
664 * This is true for all paletted codecs implemented in
666 if (st->codec->extradata_size &&
667 (st->codec->bits_per_coded_sample <= 8)) {
668 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
669 const uint8_t *pal_src;
671 pal_size = FFMIN(pal_size, st->codec->extradata_size);
672 pal_src = st->codec->extradata +
673 st->codec->extradata_size - pal_size;
674 for (i = 0; i < pal_size / 4; i++)
675 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
679 print_tag("video", tag1, 0);
681 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
682 st->codec->codec_tag = tag1;
683 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
685 /* This is needed to get the pict type which is necessary
686 * for generating correct pts. */
687 st->need_parsing = AVSTREAM_PARSE_HEADERS;
689 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
690 st->codec->extradata_size < 1U << 30) {
691 st->codec->extradata_size += 9;
692 if ((ret = av_reallocp(&st->codec->extradata,
693 st->codec->extradata_size +
694 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
695 st->codec->extradata_size = 0;
698 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
701 st->codec->height = FFABS(st->codec->height);
703 // avio_skip(pb, size - 5 * 4);
705 case AVMEDIA_TYPE_AUDIO:
706 ret = ff_get_wav_header(pb, st->codec, size);
709 ast->dshow_block_align = st->codec->block_align;
710 if (ast->sample_size && st->codec->block_align &&
711 ast->sample_size != st->codec->block_align) {
714 "sample size (%d) != block align (%d)\n",
716 st->codec->block_align);
717 ast->sample_size = st->codec->block_align;
720 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
723 /* Force parsing as several audio frames can be in
724 * one packet and timestamps refer to packet start. */
725 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
726 /* ADTS header is in extradata, AAC without header must be
727 * stored as exact frames. Parser not needed and it will
729 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
730 st->codec->extradata_size)
731 st->need_parsing = AVSTREAM_PARSE_NONE;
732 /* AVI files with Xan DPCM audio (wrongly) declare PCM
733 * audio in the header but have Axan as stream_code_tag. */
734 if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
735 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
736 st->codec->codec_tag = 0;
737 ast->dshow_block_align = 0;
739 if (amv_file_format) {
740 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
741 ast->dshow_block_align = 0;
743 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
744 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
745 ast->dshow_block_align = 0;
747 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
748 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
749 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
750 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
751 ast->sample_size = 0;
754 case AVMEDIA_TYPE_SUBTITLE:
755 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
756 st->request_probe= 1;
760 st->codec->codec_type = AVMEDIA_TYPE_DATA;
761 st->codec->codec_id = AV_CODEC_ID_NONE;
762 st->codec->codec_tag = 0;
768 case MKTAG('s', 't', 'r', 'd'):
769 if (stream_index >= (unsigned)s->nb_streams
770 || s->streams[stream_index]->codec->extradata_size
771 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
774 uint64_t cur_pos = avio_tell(pb);
775 if (cur_pos < list_end)
776 size = FFMIN(size, list_end - cur_pos);
777 st = s->streams[stream_index];
780 if (ff_alloc_extradata(st->codec, size))
781 return AVERROR(ENOMEM);
782 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
785 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
789 case MKTAG('i', 'n', 'd', 'x'):
791 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
793 read_braindead_odml_indx(s, 0) < 0 &&
794 (s->error_recognition & AV_EF_EXPLODE))
796 avio_seek(pb, i + size, SEEK_SET);
798 case MKTAG('v', 'p', 'r', 'p'):
799 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
800 AVRational active, active_aspect;
802 st = s->streams[stream_index];
809 active_aspect.den = avio_rl16(pb);
810 active_aspect.num = avio_rl16(pb);
811 active.num = avio_rl32(pb);
812 active.den = avio_rl32(pb);
813 avio_rl32(pb); // nbFieldsPerFrame
815 if (active_aspect.num && active_aspect.den &&
816 active.num && active.den) {
817 st->sample_aspect_ratio = av_div_q(active_aspect, active);
818 av_dlog(s, "vprp %d/%d %d/%d\n",
819 active_aspect.num, active_aspect.den,
820 active.num, active.den);
826 case MKTAG('s', 't', 'r', 'n'):
828 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
834 if (size > 1000000) {
835 av_log(s, AV_LOG_ERROR,
836 "Something went wrong during header parsing, "
837 "I will ignore it and try to continue anyway.\n");
838 if (s->error_recognition & AV_EF_EXPLODE)
840 avi->movi_list = avio_tell(pb) - 4;
841 avi->movi_end = avi->fsize;
852 /* check stream number */
853 if (stream_index != s->nb_streams - 1) {
856 return AVERROR_INVALIDDATA;
859 if (!avi->index_loaded && pb->seekable)
861 avi->index_loaded |= 1;
862 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
864 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
865 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
866 for (i = 0; i < s->nb_streams; i++) {
867 AVStream *st = s->streams[i];
868 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
869 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
870 st->need_parsing = AVSTREAM_PARSE_FULL;
873 for (i = 0; i < s->nb_streams; i++) {
874 AVStream *st = s->streams[i];
875 if (st->nb_index_entries)
878 // DV-in-AVI cannot be non-interleaved, if set this must be
881 avi->non_interleaved = 0;
882 if (i == s->nb_streams && avi->non_interleaved) {
883 av_log(s, AV_LOG_WARNING,
884 "Non-interleaved AVI without index, switching to interleaved\n");
885 avi->non_interleaved = 0;
888 if (avi->non_interleaved) {
889 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
893 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
894 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
899 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
901 if (pkt->size >= 7 &&
902 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
904 int score = AVPROBE_SCORE_EXTENSION, ret;
905 AVIStream *ast = st->priv_data;
906 AVInputFormat *sub_demuxer;
907 AVRational time_base;
908 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
910 0, NULL, NULL, NULL, NULL);
912 unsigned int desc_len = avio_rl32(pb);
914 if (desc_len > pb->buf_end - pb->buf_ptr)
917 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
918 avio_skip(pb, desc_len - ret);
920 av_dict_set(&st->metadata, "title", desc, 0);
922 avio_rl16(pb); /* flags? */
923 avio_rl32(pb); /* data size */
925 pd = (AVProbeData) { .buf = pb->buf_ptr,
926 .buf_size = pb->buf_end - pb->buf_ptr };
927 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
930 if (!(ast->sub_ctx = avformat_alloc_context()))
933 ast->sub_ctx->pb = pb;
934 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
935 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
936 *st->codec = *ast->sub_ctx->streams[0]->codec;
937 ast->sub_ctx->streams[0]->codec->extradata = NULL;
938 time_base = ast->sub_ctx->streams[0]->time_base;
939 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
941 ast->sub_buffer = pkt->data;
942 memset(pkt, 0, sizeof(*pkt));
951 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
954 AVIStream *ast, *next_ast = next_st->priv_data;
955 int64_t ts, next_ts, ts_min = INT64_MAX;
956 AVStream *st, *sub_st = NULL;
959 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
962 for (i = 0; i < s->nb_streams; i++) {
965 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
966 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
967 if (ts <= next_ts && ts < ts_min) {
975 ast = sub_st->priv_data;
977 pkt->stream_index = sub_st->index;
979 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
980 ast->sub_pkt.data = NULL;
985 static int get_stream_idx(unsigned *d)
987 if (d[0] >= '0' && d[0] <= '9' &&
988 d[1] >= '0' && d[1] <= '9') {
989 return (d[0] - '0') * 10 + (d[1] - '0');
991 return 100; // invalid stream ID
997 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
999 static int avi_sync(AVFormatContext *s, int exit_early)
1001 AVIContext *avi = s->priv_data;
1002 AVIOContext *pb = s->pb;
1009 memset(d, -1, sizeof(d));
1010 for (i = sync = avio_tell(pb); !url_feof(pb); i++) {
1013 for (j = 0; j < 7; j++)
1017 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1019 n = get_stream_idx(d + 2);
1020 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1021 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1022 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1026 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1028 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1029 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1030 avio_skip(pb, size);
1035 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1040 n = avi->dv_demux ? 0 : get_stream_idx(d);
1042 if (!((i - avi->last_pkt_pos) & 1) &&
1043 get_stream_idx(d + 1) < s->nb_streams)
1046 // detect ##ix chunk and skip
1047 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1048 avio_skip(pb, size);
1053 if (n < s->nb_streams) {
1057 ast = st->priv_data;
1060 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
1064 if (s->nb_streams >= 2) {
1065 AVStream *st1 = s->streams[1];
1066 AVIStream *ast1 = st1->priv_data;
1067 // workaround for broken small-file-bug402.avi
1068 if ( d[2] == 'w' && d[3] == 'b'
1070 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1071 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1072 && ast->prefix == 'd'*256+'c'
1073 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1078 av_log(s, AV_LOG_WARNING,
1079 "Invalid stream + prefix combination, assuming audio.\n");
1083 if (!avi->dv_demux &&
1084 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1085 // FIXME: needs a little reordering
1086 (st->discard >= AVDISCARD_NONKEY &&
1087 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1088 || st->discard >= AVDISCARD_ALL)) {
1090 ast->frame_offset += get_duration(ast, size);
1091 avio_skip(pb, size);
1096 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1097 int k = avio_r8(pb);
1098 int last = (k + avio_r8(pb) - 1) & 0xFF;
1100 avio_rl16(pb); // flags
1102 // b + (g << 8) + (r << 16);
1103 for (; k <= last; k++)
1104 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1108 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1109 d[2] < 128 && d[3] < 128) ||
1110 d[2] * 256 + d[3] == ast->prefix /* ||
1111 (d[2] == 'd' && d[3] == 'c') ||
1112 (d[2] == 'w' && d[3] == 'b') */) {
1115 if (d[2] * 256 + d[3] == ast->prefix)
1116 ast->prefix_count++;
1118 ast->prefix = d[2] * 256 + d[3];
1119 ast->prefix_count = 0;
1122 avi->stream_index = n;
1123 ast->packet_size = size + 8;
1124 ast->remaining = size;
1126 if (size || !ast->sample_size) {
1127 uint64_t pos = avio_tell(pb) - 8;
1128 if (!st->index_entries || !st->nb_index_entries ||
1129 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1130 av_add_index_entry(st, pos, ast->frame_offset, size,
1131 0, AVINDEX_KEYFRAME);
1144 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1146 AVIContext *avi = s->priv_data;
1147 AVIOContext *pb = s->pb;
1149 #if FF_API_DESTRUCT_PACKET
1153 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1154 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1161 if (avi->non_interleaved) {
1162 int best_stream_index = 0;
1163 AVStream *best_st = NULL;
1164 AVIStream *best_ast;
1165 int64_t best_ts = INT64_MAX;
1168 for (i = 0; i < s->nb_streams; i++) {
1169 AVStream *st = s->streams[i];
1170 AVIStream *ast = st->priv_data;
1171 int64_t ts = ast->frame_offset;
1174 if (!st->nb_index_entries)
1177 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1178 if (!ast->remaining && ts > last_ts)
1181 ts = av_rescale_q(ts, st->time_base,
1182 (AVRational) { FFMAX(1, ast->sample_size),
1185 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1186 st->time_base.num, st->time_base.den, ast->frame_offset);
1190 best_stream_index = i;
1196 best_ast = best_st->priv_data;
1197 best_ts = best_ast->frame_offset;
1198 if (best_ast->remaining) {
1199 i = av_index_search_timestamp(best_st,
1202 AVSEEK_FLAG_BACKWARD);
1204 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1206 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1210 int64_t pos = best_st->index_entries[i].pos;
1211 pos += best_ast->packet_size - best_ast->remaining;
1212 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1215 av_assert0(best_ast->remaining <= best_ast->packet_size);
1217 avi->stream_index = best_stream_index;
1218 if (!best_ast->remaining)
1219 best_ast->packet_size =
1220 best_ast->remaining = best_st->index_entries[i].size;
1227 if (avi->stream_index >= 0) {
1228 AVStream *st = s->streams[avi->stream_index];
1229 AVIStream *ast = st->priv_data;
1232 if (get_subtitle_pkt(s, st, pkt))
1235 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1236 if (ast->sample_size <= 1)
1238 else if (ast->sample_size < 32)
1239 // arbitrary multiplier to avoid tiny packets for raw PCM data
1240 size = 1024 * ast->sample_size;
1242 size = ast->sample_size;
1244 if (size > ast->remaining)
1245 size = ast->remaining;
1246 avi->last_pkt_pos = avio_tell(pb);
1247 err = av_get_packet(pb, pkt, size);
1252 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1254 pal = av_packet_new_side_data(pkt,
1255 AV_PKT_DATA_PALETTE,
1258 av_log(s, AV_LOG_ERROR,
1259 "Failed to allocate data for palette\n");
1261 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1266 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1267 AVBufferRef *avbuf = pkt->buf;
1268 #if FF_API_DESTRUCT_PACKET
1269 FF_DISABLE_DEPRECATION_WARNINGS
1270 dstr = pkt->destruct;
1271 FF_ENABLE_DEPRECATION_WARNINGS
1273 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1274 pkt->data, pkt->size, pkt->pos);
1275 #if FF_API_DESTRUCT_PACKET
1276 FF_DISABLE_DEPRECATION_WARNINGS
1277 pkt->destruct = dstr;
1278 FF_ENABLE_DEPRECATION_WARNINGS
1281 pkt->flags |= AV_PKT_FLAG_KEY;
1283 av_free_packet(pkt);
1284 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1285 !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1286 ast->frame_offset++;
1287 avi->stream_index = -1;
1291 /* XXX: How to handle B-frames in AVI? */
1292 pkt->dts = ast->frame_offset;
1293 // pkt->dts += ast->start;
1294 if (ast->sample_size)
1295 pkt->dts /= ast->sample_size;
1297 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1298 "base:%d st:%d size:%d\n",
1307 pkt->stream_index = avi->stream_index;
1309 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1312 av_assert0(st->index_entries);
1314 index = av_index_search_timestamp(st, ast->frame_offset, 0);
1315 e = &st->index_entries[index];
1317 if (index >= 0 && e->timestamp == ast->frame_offset) {
1318 if (index == st->nb_index_entries-1) {
1322 for (i=0; i<FFMIN(size,256); i++) {
1323 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1324 if (state == 0x1B6) {
1325 key= !(pkt->data[i]&0xC0);
1330 state= (state<<8) + pkt->data[i];
1333 e->flags &= ~AVINDEX_KEYFRAME;
1335 if (e->flags & AVINDEX_KEYFRAME)
1336 pkt->flags |= AV_PKT_FLAG_KEY;
1339 pkt->flags |= AV_PKT_FLAG_KEY;
1341 ast->frame_offset += get_duration(ast, pkt->size);
1343 ast->remaining -= err;
1344 if (!ast->remaining) {
1345 avi->stream_index = -1;
1346 ast->packet_size = 0;
1349 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1350 av_free_packet(pkt);
1355 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1356 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1358 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1359 avi->non_interleaved= 1;
1360 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1361 }else if (avi->dts_max < dts)
1368 if ((err = avi_sync(s, 0)) < 0)
1373 /* XXX: We make the implicit supposition that the positions are sorted
1374 * for each stream. */
1375 static int avi_read_idx1(AVFormatContext *s, int size)
1377 AVIContext *avi = s->priv_data;
1378 AVIOContext *pb = s->pb;
1379 int nb_index_entries, i;
1382 unsigned int index, tag, flags, pos, len, first_packet = 1;
1383 unsigned last_pos = -1;
1384 unsigned last_idx = -1;
1385 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1388 nb_index_entries = size / 16;
1389 if (nb_index_entries <= 0)
1390 return AVERROR_INVALIDDATA;
1392 idx1_pos = avio_tell(pb);
1393 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1394 if (avi_sync(s, 1) == 0)
1395 first_packet_pos = avio_tell(pb) - 8;
1396 avi->stream_index = -1;
1397 avio_seek(pb, idx1_pos, SEEK_SET);
1399 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1400 first_packet_pos = 0;
1401 data_offset = avi->movi_list;
1404 /* Read the entries and sort them in each stream component. */
1405 for (i = 0; i < nb_index_entries; i++) {
1409 tag = avio_rl32(pb);
1410 flags = avio_rl32(pb);
1411 pos = avio_rl32(pb);
1412 len = avio_rl32(pb);
1413 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1414 i, tag, flags, pos, len);
1416 index = ((tag & 0xff) - '0') * 10;
1417 index += (tag >> 8 & 0xff) - '0';
1418 if (index >= s->nb_streams)
1420 st = s->streams[index];
1421 ast = st->priv_data;
1423 if (first_packet && first_packet_pos) {
1424 data_offset = first_packet_pos - pos;
1429 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1431 // even if we have only a single stream, we should
1432 // switch to non-interleaved to get correct timestamps
1433 if (last_pos == pos)
1434 avi->non_interleaved = 1;
1435 if (last_idx != pos && len) {
1436 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1437 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1440 ast->cum_len += get_duration(ast, len);
1442 anykey |= flags&AVIIF_INDEX;
1445 for (index = 0; index < s->nb_streams; index++) {
1446 st = s->streams[index];
1447 if (st->nb_index_entries)
1448 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1454 static int guess_ni_flag(AVFormatContext *s)
1457 int64_t last_start = 0;
1458 int64_t first_end = INT64_MAX;
1459 int64_t oldpos = avio_tell(s->pb);
1461 int64_t min_pos, pos;
1463 for (i = 0; i < s->nb_streams; i++) {
1464 AVStream *st = s->streams[i];
1465 int n = st->nb_index_entries;
1472 int64_t pos = st->index_entries[0].pos;
1473 avio_seek(s->pb, pos + 4, SEEK_SET);
1474 size = avio_rl32(s->pb);
1475 if (pos + size > st->index_entries[1].pos)
1476 last_start = INT64_MAX;
1479 if (st->index_entries[0].pos > last_start)
1480 last_start = st->index_entries[0].pos;
1481 if (st->index_entries[n - 1].pos < first_end)
1482 first_end = st->index_entries[n - 1].pos;
1484 avio_seek(s->pb, oldpos, SEEK_SET);
1485 if (last_start > first_end)
1487 idx= av_calloc(s->nb_streams, sizeof(*idx));
1490 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
1491 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
1492 min_pos = INT64_MAX;
1494 for (i=0; i<s->nb_streams; i++) {
1495 AVStream *st = s->streams[i];
1496 AVIStream *ast = st->priv_data;
1497 int n= st->nb_index_entries;
1498 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
1501 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp/FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q));
1502 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1505 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp/FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q));
1507 if (max_dts - min_dts > 2*AV_TIME_BASE) {
1516 static int avi_load_index(AVFormatContext *s)
1518 AVIContext *avi = s->priv_data;
1519 AVIOContext *pb = s->pb;
1521 int64_t pos = avio_tell(pb);
1525 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1526 goto the_end; // maybe truncated file
1527 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1529 tag = avio_rl32(pb);
1530 size = avio_rl32(pb);
1533 next = avio_tell(pb) + size + (size & 1);
1535 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1542 if (tag == MKTAG('i', 'd', 'x', '1') &&
1543 avi_read_idx1(s, size) >= 0) {
1544 avi->index_loaded=2;
1546 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1547 uint32_t tag1 = avio_rl32(pb);
1549 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1550 ff_read_riff_info(s, size - 4);
1554 if (avio_seek(pb, next, SEEK_SET) < 0)
1555 break; // something is wrong here
1559 avio_seek(pb, pos, SEEK_SET);
1563 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1565 AVIStream *ast2 = st2->priv_data;
1566 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1567 av_free_packet(&ast2->sub_pkt);
1568 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1569 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1570 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1573 static int avi_read_seek(AVFormatContext *s, int stream_index,
1574 int64_t timestamp, int flags)
1576 AVIContext *avi = s->priv_data;
1579 int64_t pos, pos_min;
1582 /* Does not matter which stream is requested dv in avi has the
1583 * stream information in the first video stream.
1588 if (!avi->index_loaded) {
1589 /* we only load the index on demand */
1591 avi->index_loaded |= 1;
1593 av_assert0(stream_index >= 0);
1595 st = s->streams[stream_index];
1596 ast = st->priv_data;
1597 index = av_index_search_timestamp(st,
1598 timestamp * FFMAX(ast->sample_size, 1),
1601 if (st->nb_index_entries > 0)
1602 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1603 timestamp * FFMAX(ast->sample_size, 1),
1604 st->index_entries[0].timestamp,
1605 st->index_entries[st->nb_index_entries - 1].timestamp);
1606 return AVERROR_INVALIDDATA;
1609 /* find the position */
1610 pos = st->index_entries[index].pos;
1611 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1613 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1614 timestamp, index, st->index_entries[index].timestamp);
1616 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1617 /* One and only one real stream for DV in AVI, and it has video */
1618 /* offsets. Calling with other stream indexes should have failed */
1619 /* the av_index_search_timestamp call above. */
1621 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1624 /* Feed the DV video stream version of the timestamp to the */
1625 /* DV demux so it can synthesize correct timestamps. */
1626 ff_dv_offset_reset(avi->dv_demux, timestamp);
1628 avi->stream_index = -1;
1633 for (i = 0; i < s->nb_streams; i++) {
1634 AVStream *st2 = s->streams[i];
1635 AVIStream *ast2 = st2->priv_data;
1638 ast2->remaining = 0;
1640 if (ast2->sub_ctx) {
1641 seek_subtitle(st, st2, timestamp);
1645 if (st2->nb_index_entries <= 0)
1648 // av_assert1(st2->codec->block_align);
1649 av_assert0((int64_t)st2->time_base.num * ast2->rate ==
1650 (int64_t)st2->time_base.den * ast2->scale);
1651 index = av_index_search_timestamp(st2,
1652 av_rescale_q(timestamp,
1655 FFMAX(ast2->sample_size, 1),
1657 AVSEEK_FLAG_BACKWARD |
1658 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1661 ast2->seek_pos = st2->index_entries[index].pos;
1662 pos_min = FFMIN(pos_min,ast2->seek_pos);
1664 for (i = 0; i < s->nb_streams; i++) {
1665 AVStream *st2 = s->streams[i];
1666 AVIStream *ast2 = st2->priv_data;
1668 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1671 index = av_index_search_timestamp(
1673 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1674 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1677 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1679 ast2->frame_offset = st2->index_entries[index].timestamp;
1683 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1684 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1687 avi->stream_index = -1;
1688 avi->dts_max = INT_MIN;
1692 static int avi_read_close(AVFormatContext *s)
1695 AVIContext *avi = s->priv_data;
1697 for (i = 0; i < s->nb_streams; i++) {
1698 AVStream *st = s->streams[i];
1699 AVIStream *ast = st->priv_data;
1702 av_freep(&ast->sub_ctx->pb);
1703 avformat_close_input(&ast->sub_ctx);
1705 av_free(ast->sub_buffer);
1706 av_free_packet(&ast->sub_pkt);
1710 av_free(avi->dv_demux);
1715 static int avi_probe(AVProbeData *p)
1719 /* check file header */
1720 for (i = 0; avi_headers[i][0]; i++)
1721 if (!memcmp(p->buf, avi_headers[i], 4) &&
1722 !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1723 return AVPROBE_SCORE_MAX;
1728 AVInputFormat ff_avi_demuxer = {
1730 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1731 .priv_data_size = sizeof(AVIContext),
1732 .read_probe = avi_probe,
1733 .read_header = avi_read_header,
1734 .read_packet = avi_read_packet,
1735 .read_close = avi_read_close,
1736 .read_seek = avi_read_seek,
1737 .priv_class = &demuxer_class,