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
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/mathematics.h"
38 typedef struct AVIStream {
39 int64_t frame_offset; /* current frame (video) or byte (audio) counter
40 * (used to compute the pts) */
46 int sample_size; /* size of one sample (or packet)
47 * (in the rate/scale sense) in bytes */
49 int64_t cum_len; /* temporary storage (used during seek) */
50 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
54 int dshow_block_align; /* block align variable used to emulate bugs in
55 * the MS dshow demuxer */
57 AVFormatContext *sub_ctx;
76 DVDemuxContext *dv_demux;
79 #define MAX_ODML_DEPTH 1000
84 static const AVOption options[] = {
85 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
89 static const AVClass demuxer_class = {
91 .item_name = av_default_item_name,
93 .version = LIBAVUTIL_VERSION_INT,
94 .category = AV_CLASS_CATEGORY_DEMUXER,
98 static const char avi_headers[][8] = {
99 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
100 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
101 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
102 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
103 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
107 static const AVMetadataConv avi_metadata_conv[] = {
112 static int avi_load_index(AVFormatContext *s);
113 static int guess_ni_flag(AVFormatContext *s);
115 #define print_tag(str, tag, size) \
116 av_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
117 avio_tell(pb), str, tag & 0xff, \
119 (tag >> 16) & 0xff, \
120 (tag >> 24) & 0xff, \
123 static inline int get_duration(AVIStream *ast, int len)
125 if (ast->sample_size)
127 else if (ast->dshow_block_align)
128 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
133 static int get_riff(AVFormatContext *s, AVIOContext *pb)
135 AVIContext *avi = s->priv_data;
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);
145 for (i = 0; avi_headers[i][0]; i++)
146 if (!memcmp(header, avi_headers[i], 8))
148 if (!avi_headers[i][0])
149 return AVERROR_INVALIDDATA;
151 if (header[7] == 0x19)
152 av_log(s, AV_LOG_INFO,
153 "This file has been generated by a totally broken muxer.\n");
158 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
160 AVIContext *avi = s->priv_data;
161 AVIOContext *pb = s->pb;
162 int longs_pre_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');
173 int64_t last_pos = -1;
174 int64_t filesize = avi->fsize;
177 "longs_pre_entry:%d index_type:%d entries_in_use:%d "
178 "chunk_id:%X base:%16"PRIX64"\n",
185 if (stream_id >= s->nb_streams || stream_id < 0)
186 return AVERROR_INVALIDDATA;
187 st = s->streams[stream_id];
191 return AVERROR_INVALIDDATA;
195 if (index_type && longs_pre_entry != 2)
196 return AVERROR_INVALIDDATA;
198 return AVERROR_INVALIDDATA;
200 if (filesize > 0 && base >= filesize) {
201 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
202 if (base >> 32 == (base & 0xFFFFFFFF) &&
203 (base & 0xFFFFFFFF) < filesize &&
204 filesize <= 0xFFFFFFFF)
207 return AVERROR_INVALIDDATA;
210 for (i = 0; i < entries_in_use; i++) {
212 int64_t pos = avio_rl32(pb) + base - 8;
213 int len = avio_rl32(pb);
218 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
221 return AVERROR_INVALIDDATA;
223 if (last_pos == pos || pos == base - 8)
224 avi->non_interleaved = 1;
225 if (last_pos != pos && (len || !ast->sample_size))
226 av_add_index_entry(st, pos, ast->cum_len, len, 0,
227 key ? AVINDEX_KEYFRAME : 0);
229 ast->cum_len += get_duration(ast, len);
234 offset = avio_rl64(pb);
235 avio_rl32(pb); /* size */
236 duration = avio_rl32(pb);
239 return AVERROR_INVALIDDATA;
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;
248 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
251 read_braindead_odml_indx(s, frame_num);
253 frame_num += duration;
255 if (avio_seek(pb, pos, SEEK_SET) < 0) {
256 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
262 avi->index_loaded = 2;
266 static void clean_index(AVFormatContext *s)
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;
278 if (n != 1 || ast->sample_size == 0)
284 pos = st->index_entries[0].pos;
285 size = st->index_entries[0].size;
286 ts = st->index_entries[0].timestamp;
288 for (j = 0; j < size; j += max)
289 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
294 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
297 AVIOContext *pb = s->pb;
303 if (size == UINT_MAX)
304 return AVERROR(EINVAL);
305 value = av_malloc(size + 1);
307 return AVERROR(ENOMEM);
308 avio_read(pb, value, size);
313 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
314 AV_DICT_DONT_STRDUP_VAL);
317 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
318 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
320 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
322 char month[4], time[9], buffer[64];
324 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
325 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
326 month, &day, time, &year) == 4) {
327 for (i = 0; i < 12; i++)
328 if (!av_strcasecmp(month, months[i])) {
329 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
330 year, i + 1, day, time);
331 av_dict_set(metadata, "creation_time", buffer, 0);
333 } else if (date[4] == '/' && date[7] == '/') {
334 date[4] = date[7] = '-';
335 av_dict_set(metadata, "creation_time", date, 0);
339 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
341 while (avio_tell(s->pb) < end) {
342 uint32_t tag = avio_rl32(s->pb);
343 uint32_t size = avio_rl32(s->pb);
345 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
347 uint64_t tag_end = avio_tell(s->pb) + size;
348 while (avio_tell(s->pb) < tag_end) {
349 uint16_t tag = avio_rl16(s->pb);
350 uint16_t size = avio_rl16(s->pb);
351 const char *name = NULL;
352 char buffer[64] = { 0 };
353 size = FFMIN(size, tag_end - avio_tell(s->pb));
354 size -= avio_read(s->pb, buffer,
355 FFMIN(size, sizeof(buffer) - 1));
364 name = "creation_time";
365 if (buffer[4] == ':' && buffer[7] == ':')
366 buffer[4] = buffer[7] = '-';
370 av_dict_set(&s->metadata, name, buffer, 0);
371 avio_skip(s->pb, size);
376 avio_skip(s->pb, size);
382 static int avi_read_header(AVFormatContext *s)
384 AVIContext *avi = s->priv_data;
385 AVIOContext *pb = s->pb;
386 unsigned int tag, tag1, handler;
387 int codec_type, stream_index, frame_period;
391 AVIStream *ast = NULL;
392 int avih_width = 0, avih_height = 0;
393 int amv_file_format = 0;
394 uint64_t list_end = 0;
396 AVDictionaryEntry *dict_entry;
398 avi->stream_index = -1;
400 ret = get_riff(s, pb);
404 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
406 avi->io_fsize = avi->fsize = avio_size(pb);
407 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
408 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
418 size = avio_rl32(pb);
420 print_tag("tag", tag, size);
423 case MKTAG('L', 'I', 'S', 'T'):
424 list_end = avio_tell(pb) + size;
425 /* Ignored, except at start of video packets. */
426 tag1 = avio_rl32(pb);
428 print_tag("list", tag1, 0);
430 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
431 avi->movi_list = avio_tell(pb) - 4;
433 avi->movi_end = avi->movi_list + size + (size & 1);
435 avi->movi_end = avi->fsize;
436 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
438 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
439 ff_read_riff_info(s, size - 4);
440 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
441 avi_read_nikon(s, list_end);
444 case MKTAG('I', 'D', 'I', 'T'):
446 unsigned char date[64] = { 0 };
448 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
450 avi_metadata_creation_time(&s->metadata, date);
453 case MKTAG('d', 'm', 'l', 'h'):
455 avio_skip(pb, size + (size & 1));
457 case MKTAG('a', 'm', 'v', 'h'):
459 case MKTAG('a', 'v', 'i', 'h'):
461 /* using frame_period is bad idea */
462 frame_period = avio_rl32(pb);
463 avio_rl32(pb); /* max. bytes per second */
465 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
467 avio_skip(pb, 2 * 4);
470 avih_width = avio_rl32(pb);
471 avih_height = avio_rl32(pb);
473 avio_skip(pb, size - 10 * 4);
475 case MKTAG('s', 't', 'r', 'h'):
478 tag1 = avio_rl32(pb);
479 handler = avio_rl32(pb); /* codec tag */
481 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
482 avio_skip(pb, size - 8);
486 st = avformat_new_stream(s, NULL);
490 st->id = stream_index;
491 ast = av_mallocz(sizeof(AVIStream));
497 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
498 : MKTAG('v', 'i', 'd', 's');
500 print_tag("strh", tag1, -1);
502 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
503 tag1 == MKTAG('i', 'v', 'a', 's')) {
506 /* After some consideration -- I don't think we
507 * have to support anything but DV in type1 AVIs. */
508 if (s->nb_streams != 1)
511 if (handler != MKTAG('d', 'v', 's', 'd') &&
512 handler != MKTAG('d', 'v', 'h', 'd') &&
513 handler != MKTAG('d', 'v', 's', 'l'))
516 ast = s->streams[0]->priv_data;
517 av_freep(&s->streams[0]->codec->extradata);
518 av_freep(&s->streams[0]->codec);
519 if (s->streams[0]->info)
520 av_freep(&s->streams[0]->info->duration_error);
521 av_freep(&s->streams[0]->info);
522 av_freep(&s->streams[0]);
524 if (CONFIG_DV_DEMUXER) {
525 avi->dv_demux = avpriv_dv_init_demux(s);
530 s->streams[0]->priv_data = ast;
531 avio_skip(pb, 3 * 4);
532 ast->scale = avio_rl32(pb);
533 ast->rate = avio_rl32(pb);
534 avio_skip(pb, 4); /* start time */
536 dv_dur = avio_rl32(pb);
537 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
538 dv_dur *= AV_TIME_BASE;
539 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
541 /* else, leave duration alone; timing estimation in utils.c
542 * will make a guess based on bitrate. */
544 stream_index = s->nb_streams - 1;
545 avio_skip(pb, size - 9 * 4);
549 av_assert0(stream_index < s->nb_streams);
550 st->codec->stream_codec_tag = handler;
552 avio_rl32(pb); /* flags */
553 avio_rl16(pb); /* priority */
554 avio_rl16(pb); /* language */
555 avio_rl32(pb); /* initial frame */
556 ast->scale = avio_rl32(pb);
557 ast->rate = avio_rl32(pb);
558 if (!(ast->scale && ast->rate)) {
559 av_log(s, AV_LOG_WARNING,
560 "scale/rate is %u/%u which is invalid. "
561 "(This file has been generated by broken software.)\n",
566 ast->scale = frame_period;
572 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
574 ast->cum_len = avio_rl32(pb); /* start */
575 st->nb_frames = avio_rl32(pb);
578 avio_rl32(pb); /* buffer size */
579 avio_rl32(pb); /* quality */
580 if (ast->cum_len*ast->scale/ast->rate > 3600) {
581 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
582 return AVERROR_INVALIDDATA;
584 ast->sample_size = avio_rl32(pb); /* sample ssize */
585 ast->cum_len *= FFMAX(1, ast->sample_size);
586 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
587 ast->rate, ast->scale, ast->sample_size);
590 case MKTAG('v', 'i', 'd', 's'):
591 codec_type = AVMEDIA_TYPE_VIDEO;
593 ast->sample_size = 0;
595 case MKTAG('a', 'u', 'd', 's'):
596 codec_type = AVMEDIA_TYPE_AUDIO;
598 case MKTAG('t', 'x', 't', 's'):
599 codec_type = AVMEDIA_TYPE_SUBTITLE;
601 case MKTAG('d', 'a', 't', 's'):
602 codec_type = AVMEDIA_TYPE_DATA;
605 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
607 if (ast->sample_size == 0) {
608 st->duration = st->nb_frames;
609 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
610 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
611 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
614 ast->frame_offset = ast->cum_len;
615 avio_skip(pb, size - 12 * 4);
617 case MKTAG('s', 't', 'r', 'f'):
621 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
624 uint64_t cur_pos = avio_tell(pb);
626 if (cur_pos < list_end)
627 size = FFMIN(size, list_end - cur_pos);
628 st = s->streams[stream_index];
629 if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
633 switch (codec_type) {
634 case AVMEDIA_TYPE_VIDEO:
635 if (amv_file_format) {
636 st->codec->width = avih_width;
637 st->codec->height = avih_height;
638 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
639 st->codec->codec_id = AV_CODEC_ID_AMV;
643 tag1 = ff_get_bmp_header(pb, st, &esize);
645 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
646 tag1 == MKTAG('D', 'X', 'S', 'A')) {
647 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
648 st->codec->codec_tag = tag1;
649 st->codec->codec_id = AV_CODEC_ID_XSUB;
653 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
654 if (esize == size-1 && (esize&1)) {
655 st->codec->extradata_size = esize - 10 * 4;
657 st->codec->extradata_size = size - 10 * 4;
658 if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
659 return AVERROR(ENOMEM);
662 // FIXME: check if the encoder really did this correctly
663 if (st->codec->extradata_size & 1)
666 /* Extract palette from extradata if bpp <= 8.
667 * This code assumes that extradata contains only palette.
668 * This is true for all paletted codecs implemented in
670 if (st->codec->extradata_size &&
671 (st->codec->bits_per_coded_sample <= 8)) {
672 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
673 const uint8_t *pal_src;
675 pal_size = FFMIN(pal_size, st->codec->extradata_size);
676 pal_src = st->codec->extradata +
677 st->codec->extradata_size - pal_size;
678 for (i = 0; i < pal_size / 4; i++)
679 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
683 print_tag("video", tag1, 0);
685 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
686 st->codec->codec_tag = tag1;
687 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
689 /* This is needed to get the pict type which is necessary
690 * for generating correct pts. */
691 st->need_parsing = AVSTREAM_PARSE_HEADERS;
692 if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
693 st->need_parsing = AVSTREAM_PARSE_FULL;
695 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
696 st->codec->extradata_size < 1U << 30) {
697 st->codec->extradata_size += 9;
698 if ((ret = av_reallocp(&st->codec->extradata,
699 st->codec->extradata_size +
700 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
701 st->codec->extradata_size = 0;
704 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
707 st->codec->height = FFABS(st->codec->height);
709 // avio_skip(pb, size - 5 * 4);
711 case AVMEDIA_TYPE_AUDIO:
712 ret = ff_get_wav_header(pb, st->codec, size);
715 ast->dshow_block_align = st->codec->block_align;
716 if (ast->sample_size && st->codec->block_align &&
717 ast->sample_size != st->codec->block_align) {
720 "sample size (%d) != block align (%d)\n",
722 st->codec->block_align);
723 ast->sample_size = st->codec->block_align;
726 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
729 /* Force parsing as several audio frames can be in
730 * one packet and timestamps refer to packet start. */
731 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
732 /* ADTS header is in extradata, AAC without header must be
733 * stored as exact frames. Parser not needed and it will
735 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
736 st->codec->extradata_size)
737 st->need_parsing = AVSTREAM_PARSE_NONE;
738 /* AVI files with Xan DPCM audio (wrongly) declare PCM
739 * audio in the header but have Axan as stream_code_tag. */
740 if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
741 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
742 st->codec->codec_tag = 0;
743 ast->dshow_block_align = 0;
745 if (amv_file_format) {
746 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
747 ast->dshow_block_align = 0;
749 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
750 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
751 ast->dshow_block_align = 0;
753 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
754 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
755 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
756 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
757 ast->sample_size = 0;
760 case AVMEDIA_TYPE_SUBTITLE:
761 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
762 st->request_probe= 1;
766 st->codec->codec_type = AVMEDIA_TYPE_DATA;
767 st->codec->codec_id = AV_CODEC_ID_NONE;
768 st->codec->codec_tag = 0;
774 case MKTAG('s', 't', 'r', 'd'):
775 if (stream_index >= (unsigned)s->nb_streams
776 || s->streams[stream_index]->codec->extradata_size
777 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
780 uint64_t cur_pos = avio_tell(pb);
781 if (cur_pos < list_end)
782 size = FFMIN(size, list_end - cur_pos);
783 st = s->streams[stream_index];
786 if (ff_get_extradata(st->codec, pb, size) < 0)
787 return AVERROR(ENOMEM);
790 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
794 case MKTAG('i', 'n', 'd', 'x'):
796 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
798 read_braindead_odml_indx(s, 0) < 0 &&
799 (s->error_recognition & AV_EF_EXPLODE))
801 avio_seek(pb, i + size, SEEK_SET);
803 case MKTAG('v', 'p', 'r', 'p'):
804 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
805 AVRational active, active_aspect;
807 st = s->streams[stream_index];
814 active_aspect.den = avio_rl16(pb);
815 active_aspect.num = avio_rl16(pb);
816 active.num = avio_rl32(pb);
817 active.den = avio_rl32(pb);
818 avio_rl32(pb); // nbFieldsPerFrame
820 if (active_aspect.num && active_aspect.den &&
821 active.num && active.den) {
822 st->sample_aspect_ratio = av_div_q(active_aspect, active);
823 av_dlog(s, "vprp %d/%d %d/%d\n",
824 active_aspect.num, active_aspect.den,
825 active.num, active.den);
831 case MKTAG('s', 't', 'r', 'n'):
833 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
839 if (size > 1000000) {
840 av_log(s, AV_LOG_ERROR,
841 "Something went wrong during header parsing, "
842 "I will ignore it and try to continue anyway.\n");
843 if (s->error_recognition & AV_EF_EXPLODE)
845 avi->movi_list = avio_tell(pb) - 4;
846 avi->movi_end = avi->fsize;
857 /* check stream number */
858 if (stream_index != s->nb_streams - 1) {
861 return AVERROR_INVALIDDATA;
864 if (!avi->index_loaded && pb->seekable)
866 avi->index_loaded |= 1;
867 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
869 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
870 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
871 for (i = 0; i < s->nb_streams; i++) {
872 AVStream *st = s->streams[i];
873 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
874 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
875 st->need_parsing = AVSTREAM_PARSE_FULL;
878 for (i = 0; i < s->nb_streams; i++) {
879 AVStream *st = s->streams[i];
880 if (st->nb_index_entries)
883 // DV-in-AVI cannot be non-interleaved, if set this must be
886 avi->non_interleaved = 0;
887 if (i == s->nb_streams && avi->non_interleaved) {
888 av_log(s, AV_LOG_WARNING,
889 "Non-interleaved AVI without index, switching to interleaved\n");
890 avi->non_interleaved = 0;
893 if (avi->non_interleaved) {
894 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
898 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
899 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
904 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
906 if (pkt->size >= 7 &&
907 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
909 int score = AVPROBE_SCORE_EXTENSION, ret;
910 AVIStream *ast = st->priv_data;
911 AVInputFormat *sub_demuxer;
912 AVRational time_base;
913 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
915 0, NULL, NULL, NULL, NULL);
917 unsigned int desc_len = avio_rl32(pb);
919 if (desc_len > pb->buf_end - pb->buf_ptr)
922 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
923 avio_skip(pb, desc_len - ret);
925 av_dict_set(&st->metadata, "title", desc, 0);
927 avio_rl16(pb); /* flags? */
928 avio_rl32(pb); /* data size */
930 pd = (AVProbeData) { .buf = pb->buf_ptr,
931 .buf_size = pb->buf_end - pb->buf_ptr };
932 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
935 if (!(ast->sub_ctx = avformat_alloc_context()))
938 ast->sub_ctx->pb = pb;
939 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
940 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
941 *st->codec = *ast->sub_ctx->streams[0]->codec;
942 ast->sub_ctx->streams[0]->codec->extradata = NULL;
943 time_base = ast->sub_ctx->streams[0]->time_base;
944 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
946 ast->sub_buffer = pkt->data;
947 memset(pkt, 0, sizeof(*pkt));
956 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
959 AVIStream *ast, *next_ast = next_st->priv_data;
960 int64_t ts, next_ts, ts_min = INT64_MAX;
961 AVStream *st, *sub_st = NULL;
964 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
967 for (i = 0; i < s->nb_streams; i++) {
970 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
971 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
972 if (ts <= next_ts && ts < ts_min) {
980 ast = sub_st->priv_data;
982 pkt->stream_index = sub_st->index;
984 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
985 ast->sub_pkt.data = NULL;
990 static int get_stream_idx(unsigned *d)
992 if (d[0] >= '0' && d[0] <= '9' &&
993 d[1] >= '0' && d[1] <= '9') {
994 return (d[0] - '0') * 10 + (d[1] - '0');
996 return 100; // invalid stream ID
1002 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1004 static int avi_sync(AVFormatContext *s, int exit_early)
1006 AVIContext *avi = s->priv_data;
1007 AVIOContext *pb = s->pb;
1014 memset(d, -1, sizeof(d));
1015 for (i = sync = avio_tell(pb); !url_feof(pb); i++) {
1018 for (j = 0; j < 7; j++)
1022 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1024 n = get_stream_idx(d + 2);
1025 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1026 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1027 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1031 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1033 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1034 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1035 avio_skip(pb, size);
1040 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1045 n = avi->dv_demux ? 0 : get_stream_idx(d);
1047 if (!((i - avi->last_pkt_pos) & 1) &&
1048 get_stream_idx(d + 1) < s->nb_streams)
1051 // detect ##ix chunk and skip
1052 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1053 avio_skip(pb, size);
1058 if (n < s->nb_streams) {
1062 ast = st->priv_data;
1065 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
1069 if (s->nb_streams >= 2) {
1070 AVStream *st1 = s->streams[1];
1071 AVIStream *ast1 = st1->priv_data;
1072 // workaround for broken small-file-bug402.avi
1073 if ( d[2] == 'w' && d[3] == 'b'
1075 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1076 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1077 && ast->prefix == 'd'*256+'c'
1078 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1083 av_log(s, AV_LOG_WARNING,
1084 "Invalid stream + prefix combination, assuming audio.\n");
1088 if (!avi->dv_demux &&
1089 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1090 // FIXME: needs a little reordering
1091 (st->discard >= AVDISCARD_NONKEY &&
1092 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1093 || st->discard >= AVDISCARD_ALL)) {
1095 ast->frame_offset += get_duration(ast, size);
1096 avio_skip(pb, size);
1101 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1102 int k = avio_r8(pb);
1103 int last = (k + avio_r8(pb) - 1) & 0xFF;
1105 avio_rl16(pb); // flags
1107 // b + (g << 8) + (r << 16);
1108 for (; k <= last; k++)
1109 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1113 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1114 d[2] < 128 && d[3] < 128) ||
1115 d[2] * 256 + d[3] == ast->prefix /* ||
1116 (d[2] == 'd' && d[3] == 'c') ||
1117 (d[2] == 'w' && d[3] == 'b') */) {
1120 if (d[2] * 256 + d[3] == ast->prefix)
1121 ast->prefix_count++;
1123 ast->prefix = d[2] * 256 + d[3];
1124 ast->prefix_count = 0;
1127 avi->stream_index = n;
1128 ast->packet_size = size + 8;
1129 ast->remaining = size;
1131 if (size || !ast->sample_size) {
1132 uint64_t pos = avio_tell(pb) - 8;
1133 if (!st->index_entries || !st->nb_index_entries ||
1134 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1135 av_add_index_entry(st, pos, ast->frame_offset, size,
1136 0, AVINDEX_KEYFRAME);
1149 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1151 AVIContext *avi = s->priv_data;
1152 AVIOContext *pb = s->pb;
1154 #if FF_API_DESTRUCT_PACKET
1158 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1159 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1166 if (avi->non_interleaved) {
1167 int best_stream_index = 0;
1168 AVStream *best_st = NULL;
1169 AVIStream *best_ast;
1170 int64_t best_ts = INT64_MAX;
1173 for (i = 0; i < s->nb_streams; i++) {
1174 AVStream *st = s->streams[i];
1175 AVIStream *ast = st->priv_data;
1176 int64_t ts = ast->frame_offset;
1179 if (!st->nb_index_entries)
1182 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1183 if (!ast->remaining && ts > last_ts)
1186 ts = av_rescale_q(ts, st->time_base,
1187 (AVRational) { FFMAX(1, ast->sample_size),
1190 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1191 st->time_base.num, st->time_base.den, ast->frame_offset);
1195 best_stream_index = i;
1201 best_ast = best_st->priv_data;
1202 best_ts = best_ast->frame_offset;
1203 if (best_ast->remaining) {
1204 i = av_index_search_timestamp(best_st,
1207 AVSEEK_FLAG_BACKWARD);
1209 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1211 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1215 int64_t pos = best_st->index_entries[i].pos;
1216 pos += best_ast->packet_size - best_ast->remaining;
1217 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1220 av_assert0(best_ast->remaining <= best_ast->packet_size);
1222 avi->stream_index = best_stream_index;
1223 if (!best_ast->remaining)
1224 best_ast->packet_size =
1225 best_ast->remaining = best_st->index_entries[i].size;
1232 if (avi->stream_index >= 0) {
1233 AVStream *st = s->streams[avi->stream_index];
1234 AVIStream *ast = st->priv_data;
1237 if (get_subtitle_pkt(s, st, pkt))
1240 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1241 if (ast->sample_size <= 1)
1243 else if (ast->sample_size < 32)
1244 // arbitrary multiplier to avoid tiny packets for raw PCM data
1245 size = 1024 * ast->sample_size;
1247 size = ast->sample_size;
1249 if (size > ast->remaining)
1250 size = ast->remaining;
1251 avi->last_pkt_pos = avio_tell(pb);
1252 err = av_get_packet(pb, pkt, size);
1257 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1259 pal = av_packet_new_side_data(pkt,
1260 AV_PKT_DATA_PALETTE,
1263 av_log(s, AV_LOG_ERROR,
1264 "Failed to allocate data for palette\n");
1266 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1271 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1272 AVBufferRef *avbuf = pkt->buf;
1273 #if FF_API_DESTRUCT_PACKET
1274 FF_DISABLE_DEPRECATION_WARNINGS
1275 dstr = pkt->destruct;
1276 FF_ENABLE_DEPRECATION_WARNINGS
1278 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1279 pkt->data, pkt->size, pkt->pos);
1280 #if FF_API_DESTRUCT_PACKET
1281 FF_DISABLE_DEPRECATION_WARNINGS
1282 pkt->destruct = dstr;
1283 FF_ENABLE_DEPRECATION_WARNINGS
1286 pkt->flags |= AV_PKT_FLAG_KEY;
1288 av_free_packet(pkt);
1289 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1290 !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1291 ast->frame_offset++;
1292 avi->stream_index = -1;
1296 /* XXX: How to handle B-frames in AVI? */
1297 pkt->dts = ast->frame_offset;
1298 // pkt->dts += ast->start;
1299 if (ast->sample_size)
1300 pkt->dts /= ast->sample_size;
1302 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1303 "base:%d st:%d size:%d\n",
1312 pkt->stream_index = avi->stream_index;
1314 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1318 index = av_index_search_timestamp(st, ast->frame_offset, 0);
1319 e = &st->index_entries[index];
1321 if (index >= 0 && e->timestamp == ast->frame_offset) {
1322 if (index == st->nb_index_entries-1) {
1326 for (i=0; i<FFMIN(size,256); i++) {
1327 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1328 if (state == 0x1B6) {
1329 key= !(pkt->data[i]&0xC0);
1334 state= (state<<8) + pkt->data[i];
1337 e->flags &= ~AVINDEX_KEYFRAME;
1339 if (e->flags & AVINDEX_KEYFRAME)
1340 pkt->flags |= AV_PKT_FLAG_KEY;
1343 pkt->flags |= AV_PKT_FLAG_KEY;
1345 ast->frame_offset += get_duration(ast, pkt->size);
1347 ast->remaining -= err;
1348 if (!ast->remaining) {
1349 avi->stream_index = -1;
1350 ast->packet_size = 0;
1353 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1354 av_free_packet(pkt);
1359 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1360 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1362 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1363 avi->non_interleaved= 1;
1364 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1365 }else if (avi->dts_max < dts)
1372 if ((err = avi_sync(s, 0)) < 0)
1377 /* XXX: We make the implicit supposition that the positions are sorted
1378 * for each stream. */
1379 static int avi_read_idx1(AVFormatContext *s, int size)
1381 AVIContext *avi = s->priv_data;
1382 AVIOContext *pb = s->pb;
1383 int nb_index_entries, i;
1386 unsigned int index, tag, flags, pos, len, first_packet = 1;
1387 unsigned last_pos = -1;
1388 unsigned last_idx = -1;
1389 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1392 nb_index_entries = size / 16;
1393 if (nb_index_entries <= 0)
1394 return AVERROR_INVALIDDATA;
1396 idx1_pos = avio_tell(pb);
1397 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1398 if (avi_sync(s, 1) == 0)
1399 first_packet_pos = avio_tell(pb) - 8;
1400 avi->stream_index = -1;
1401 avio_seek(pb, idx1_pos, SEEK_SET);
1403 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1404 first_packet_pos = 0;
1405 data_offset = avi->movi_list;
1408 /* Read the entries and sort them in each stream component. */
1409 for (i = 0; i < nb_index_entries; i++) {
1413 tag = avio_rl32(pb);
1414 flags = avio_rl32(pb);
1415 pos = avio_rl32(pb);
1416 len = avio_rl32(pb);
1417 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1418 i, tag, flags, pos, len);
1420 index = ((tag & 0xff) - '0') * 10;
1421 index += (tag >> 8 & 0xff) - '0';
1422 if (index >= s->nb_streams)
1424 st = s->streams[index];
1425 ast = st->priv_data;
1427 if (first_packet && first_packet_pos) {
1428 data_offset = first_packet_pos - pos;
1433 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1435 // even if we have only a single stream, we should
1436 // switch to non-interleaved to get correct timestamps
1437 if (last_pos == pos)
1438 avi->non_interleaved = 1;
1439 if (last_idx != pos && len) {
1440 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1441 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1444 ast->cum_len += get_duration(ast, len);
1446 anykey |= flags&AVIIF_INDEX;
1449 for (index = 0; index < s->nb_streams; index++) {
1450 st = s->streams[index];
1451 if (st->nb_index_entries)
1452 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1458 static int guess_ni_flag(AVFormatContext *s)
1461 int64_t last_start = 0;
1462 int64_t first_end = INT64_MAX;
1463 int64_t oldpos = avio_tell(s->pb);
1465 int64_t min_pos, pos;
1467 for (i = 0; i < s->nb_streams; i++) {
1468 AVStream *st = s->streams[i];
1469 int n = st->nb_index_entries;
1476 int64_t pos = st->index_entries[0].pos;
1477 avio_seek(s->pb, pos + 4, SEEK_SET);
1478 size = avio_rl32(s->pb);
1479 if (pos + size > st->index_entries[1].pos)
1480 last_start = INT64_MAX;
1483 if (st->index_entries[0].pos > last_start)
1484 last_start = st->index_entries[0].pos;
1485 if (st->index_entries[n - 1].pos < first_end)
1486 first_end = st->index_entries[n - 1].pos;
1488 avio_seek(s->pb, oldpos, SEEK_SET);
1489 if (last_start > first_end)
1491 idx= av_calloc(s->nb_streams, sizeof(*idx));
1494 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
1495 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
1496 min_pos = INT64_MAX;
1498 for (i=0; i<s->nb_streams; i++) {
1499 AVStream *st = s->streams[i];
1500 AVIStream *ast = st->priv_data;
1501 int n= st->nb_index_entries;
1502 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
1505 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));
1506 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1509 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));
1511 if (max_dts - min_dts > 2*AV_TIME_BASE) {
1520 static int avi_load_index(AVFormatContext *s)
1522 AVIContext *avi = s->priv_data;
1523 AVIOContext *pb = s->pb;
1525 int64_t pos = avio_tell(pb);
1529 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1530 goto the_end; // maybe truncated file
1531 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1533 tag = avio_rl32(pb);
1534 size = avio_rl32(pb);
1537 next = avio_tell(pb) + size + (size & 1);
1539 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1546 if (tag == MKTAG('i', 'd', 'x', '1') &&
1547 avi_read_idx1(s, size) >= 0) {
1548 avi->index_loaded=2;
1550 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1551 uint32_t tag1 = avio_rl32(pb);
1553 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1554 ff_read_riff_info(s, size - 4);
1558 if (avio_seek(pb, next, SEEK_SET) < 0)
1559 break; // something is wrong here
1563 avio_seek(pb, pos, SEEK_SET);
1567 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1569 AVIStream *ast2 = st2->priv_data;
1570 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1571 av_free_packet(&ast2->sub_pkt);
1572 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1573 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1574 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1577 static int avi_read_seek(AVFormatContext *s, int stream_index,
1578 int64_t timestamp, int flags)
1580 AVIContext *avi = s->priv_data;
1583 int64_t pos, pos_min;
1586 /* Does not matter which stream is requested dv in avi has the
1587 * stream information in the first video stream.
1592 if (!avi->index_loaded) {
1593 /* we only load the index on demand */
1595 avi->index_loaded |= 1;
1597 av_assert0(stream_index >= 0);
1599 st = s->streams[stream_index];
1600 ast = st->priv_data;
1601 index = av_index_search_timestamp(st,
1602 timestamp * FFMAX(ast->sample_size, 1),
1605 if (st->nb_index_entries > 0)
1606 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1607 timestamp * FFMAX(ast->sample_size, 1),
1608 st->index_entries[0].timestamp,
1609 st->index_entries[st->nb_index_entries - 1].timestamp);
1610 return AVERROR_INVALIDDATA;
1613 /* find the position */
1614 pos = st->index_entries[index].pos;
1615 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1617 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1618 timestamp, index, st->index_entries[index].timestamp);
1620 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1621 /* One and only one real stream for DV in AVI, and it has video */
1622 /* offsets. Calling with other stream indexes should have failed */
1623 /* the av_index_search_timestamp call above. */
1625 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1628 /* Feed the DV video stream version of the timestamp to the */
1629 /* DV demux so it can synthesize correct timestamps. */
1630 ff_dv_offset_reset(avi->dv_demux, timestamp);
1632 avi->stream_index = -1;
1637 for (i = 0; i < s->nb_streams; i++) {
1638 AVStream *st2 = s->streams[i];
1639 AVIStream *ast2 = st2->priv_data;
1642 ast2->remaining = 0;
1644 if (ast2->sub_ctx) {
1645 seek_subtitle(st, st2, timestamp);
1649 if (st2->nb_index_entries <= 0)
1652 // av_assert1(st2->codec->block_align);
1653 av_assert0((int64_t)st2->time_base.num * ast2->rate ==
1654 (int64_t)st2->time_base.den * ast2->scale);
1655 index = av_index_search_timestamp(st2,
1656 av_rescale_q(timestamp,
1659 FFMAX(ast2->sample_size, 1),
1661 AVSEEK_FLAG_BACKWARD |
1662 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1665 ast2->seek_pos = st2->index_entries[index].pos;
1666 pos_min = FFMIN(pos_min,ast2->seek_pos);
1668 for (i = 0; i < s->nb_streams; i++) {
1669 AVStream *st2 = s->streams[i];
1670 AVIStream *ast2 = st2->priv_data;
1672 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1675 index = av_index_search_timestamp(
1677 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1678 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1681 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1683 ast2->frame_offset = st2->index_entries[index].timestamp;
1687 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1688 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1691 avi->stream_index = -1;
1692 avi->dts_max = INT_MIN;
1696 static int avi_read_close(AVFormatContext *s)
1699 AVIContext *avi = s->priv_data;
1701 for (i = 0; i < s->nb_streams; i++) {
1702 AVStream *st = s->streams[i];
1703 AVIStream *ast = st->priv_data;
1706 av_freep(&ast->sub_ctx->pb);
1707 avformat_close_input(&ast->sub_ctx);
1709 av_free(ast->sub_buffer);
1710 av_free_packet(&ast->sub_pkt);
1714 av_free(avi->dv_demux);
1719 static int avi_probe(AVProbeData *p)
1723 /* check file header */
1724 for (i = 0; avi_headers[i][0]; i++)
1725 if (!memcmp(p->buf, avi_headers[i], 4) &&
1726 !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1727 return AVPROBE_SCORE_MAX;
1732 AVInputFormat ff_avi_demuxer = {
1734 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1735 .priv_data_size = sizeof(AVIContext),
1736 .read_probe = avi_probe,
1737 .read_header = avi_read_header,
1738 .read_packet = avi_read_packet,
1739 .read_close = avi_read_close,
1740 .read_seek = avi_read_seek,
1741 .priv_class = &demuxer_class,