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 calculate_bitrate(AVFormatContext *s)
384 AVIContext *avi = s->priv_data;
389 for (i = 0; i<s->nb_streams; i++) {
391 AVStream *st = s->streams[i];
393 if (!st->nb_index_entries)
396 for (j = 0; j < st->nb_index_entries; j++)
397 len += st->index_entries[j].size;
398 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
401 if (maxpos < avi->io_fsize*9/10) // index doesnt cover the whole file
403 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
406 for (i = 0; i<s->nb_streams; i++) {
408 AVStream *st = s->streams[i];
411 for (j = 0; j < st->nb_index_entries; j++)
412 len += st->index_entries[j].size;
414 if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
416 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
417 st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
422 static int avi_read_header(AVFormatContext *s)
424 AVIContext *avi = s->priv_data;
425 AVIOContext *pb = s->pb;
426 unsigned int tag, tag1, handler;
427 int codec_type, stream_index, frame_period;
431 AVIStream *ast = NULL;
432 int avih_width = 0, avih_height = 0;
433 int amv_file_format = 0;
434 uint64_t list_end = 0;
436 AVDictionaryEntry *dict_entry;
438 avi->stream_index = -1;
440 ret = get_riff(s, pb);
444 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
446 avi->io_fsize = avi->fsize = avio_size(pb);
447 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
448 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
458 size = avio_rl32(pb);
460 print_tag("tag", tag, size);
463 case MKTAG('L', 'I', 'S', 'T'):
464 list_end = avio_tell(pb) + size;
465 /* Ignored, except at start of video packets. */
466 tag1 = avio_rl32(pb);
468 print_tag("list", tag1, 0);
470 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
471 avi->movi_list = avio_tell(pb) - 4;
473 avi->movi_end = avi->movi_list + size + (size & 1);
475 avi->movi_end = avi->fsize;
476 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
478 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
479 ff_read_riff_info(s, size - 4);
480 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
481 avi_read_nikon(s, list_end);
484 case MKTAG('I', 'D', 'I', 'T'):
486 unsigned char date[64] = { 0 };
488 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
490 avi_metadata_creation_time(&s->metadata, date);
493 case MKTAG('d', 'm', 'l', 'h'):
495 avio_skip(pb, size + (size & 1));
497 case MKTAG('a', 'm', 'v', 'h'):
499 case MKTAG('a', 'v', 'i', 'h'):
501 /* using frame_period is bad idea */
502 frame_period = avio_rl32(pb);
503 avio_rl32(pb); /* max. bytes per second */
505 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
507 avio_skip(pb, 2 * 4);
510 avih_width = avio_rl32(pb);
511 avih_height = avio_rl32(pb);
513 avio_skip(pb, size - 10 * 4);
515 case MKTAG('s', 't', 'r', 'h'):
518 tag1 = avio_rl32(pb);
519 handler = avio_rl32(pb); /* codec tag */
521 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
522 avio_skip(pb, size - 8);
526 st = avformat_new_stream(s, NULL);
530 st->id = stream_index;
531 ast = av_mallocz(sizeof(AVIStream));
537 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
538 : MKTAG('v', 'i', 'd', 's');
540 print_tag("strh", tag1, -1);
542 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
543 tag1 == MKTAG('i', 'v', 'a', 's')) {
546 /* After some consideration -- I don't think we
547 * have to support anything but DV in type1 AVIs. */
548 if (s->nb_streams != 1)
551 if (handler != MKTAG('d', 'v', 's', 'd') &&
552 handler != MKTAG('d', 'v', 'h', 'd') &&
553 handler != MKTAG('d', 'v', 's', 'l'))
556 ast = s->streams[0]->priv_data;
557 av_freep(&s->streams[0]->codec->extradata);
558 av_freep(&s->streams[0]->codec);
559 if (s->streams[0]->info)
560 av_freep(&s->streams[0]->info->duration_error);
561 av_freep(&s->streams[0]->info);
562 av_freep(&s->streams[0]);
564 if (CONFIG_DV_DEMUXER) {
565 avi->dv_demux = avpriv_dv_init_demux(s);
570 s->streams[0]->priv_data = ast;
571 avio_skip(pb, 3 * 4);
572 ast->scale = avio_rl32(pb);
573 ast->rate = avio_rl32(pb);
574 avio_skip(pb, 4); /* start time */
576 dv_dur = avio_rl32(pb);
577 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
578 dv_dur *= AV_TIME_BASE;
579 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
581 /* else, leave duration alone; timing estimation in utils.c
582 * will make a guess based on bitrate. */
584 stream_index = s->nb_streams - 1;
585 avio_skip(pb, size - 9 * 4);
589 av_assert0(stream_index < s->nb_streams);
590 st->codec->stream_codec_tag = handler;
592 avio_rl32(pb); /* flags */
593 avio_rl16(pb); /* priority */
594 avio_rl16(pb); /* language */
595 avio_rl32(pb); /* initial frame */
596 ast->scale = avio_rl32(pb);
597 ast->rate = avio_rl32(pb);
598 if (!(ast->scale && ast->rate)) {
599 av_log(s, AV_LOG_WARNING,
600 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
601 "(This file has been generated by broken software.)\n",
606 ast->scale = frame_period;
612 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
614 ast->cum_len = avio_rl32(pb); /* start */
615 st->nb_frames = avio_rl32(pb);
618 avio_rl32(pb); /* buffer size */
619 avio_rl32(pb); /* quality */
620 if (ast->cum_len*ast->scale/ast->rate > 3600) {
621 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
622 return AVERROR_INVALIDDATA;
624 ast->sample_size = avio_rl32(pb); /* sample ssize */
625 ast->cum_len *= FFMAX(1, ast->sample_size);
626 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
627 ast->rate, ast->scale, ast->sample_size);
630 case MKTAG('v', 'i', 'd', 's'):
631 codec_type = AVMEDIA_TYPE_VIDEO;
633 ast->sample_size = 0;
635 case MKTAG('a', 'u', 'd', 's'):
636 codec_type = AVMEDIA_TYPE_AUDIO;
638 case MKTAG('t', 'x', 't', 's'):
639 codec_type = AVMEDIA_TYPE_SUBTITLE;
641 case MKTAG('d', 'a', 't', 's'):
642 codec_type = AVMEDIA_TYPE_DATA;
645 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
647 if (ast->sample_size == 0) {
648 st->duration = st->nb_frames;
649 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
650 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
651 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
654 ast->frame_offset = ast->cum_len;
655 avio_skip(pb, size - 12 * 4);
657 case MKTAG('s', 't', 'r', 'f'):
661 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
664 uint64_t cur_pos = avio_tell(pb);
666 if (cur_pos < list_end)
667 size = FFMIN(size, list_end - cur_pos);
668 st = s->streams[stream_index];
669 if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
673 switch (codec_type) {
674 case AVMEDIA_TYPE_VIDEO:
675 if (amv_file_format) {
676 st->codec->width = avih_width;
677 st->codec->height = avih_height;
678 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
679 st->codec->codec_id = AV_CODEC_ID_AMV;
683 tag1 = ff_get_bmp_header(pb, st, &esize);
685 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
686 tag1 == MKTAG('D', 'X', 'S', 'A')) {
687 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
688 st->codec->codec_tag = tag1;
689 st->codec->codec_id = AV_CODEC_ID_XSUB;
693 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
694 if (esize == size-1 && (esize&1)) {
695 st->codec->extradata_size = esize - 10 * 4;
697 st->codec->extradata_size = size - 10 * 4;
698 if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
699 return AVERROR(ENOMEM);
702 // FIXME: check if the encoder really did this correctly
703 if (st->codec->extradata_size & 1)
706 /* Extract palette from extradata if bpp <= 8.
707 * This code assumes that extradata contains only palette.
708 * This is true for all paletted codecs implemented in
710 if (st->codec->extradata_size &&
711 (st->codec->bits_per_coded_sample <= 8)) {
712 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
713 const uint8_t *pal_src;
715 pal_size = FFMIN(pal_size, st->codec->extradata_size);
716 pal_src = st->codec->extradata +
717 st->codec->extradata_size - pal_size;
718 for (i = 0; i < pal_size / 4; i++)
719 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
723 print_tag("video", tag1, 0);
725 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
726 st->codec->codec_tag = tag1;
727 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
729 /* This is needed to get the pict type which is necessary
730 * for generating correct pts. */
731 st->need_parsing = AVSTREAM_PARSE_HEADERS;
732 if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
733 st->need_parsing = AVSTREAM_PARSE_FULL;
735 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
736 st->codec->extradata_size < 1U << 30) {
737 st->codec->extradata_size += 9;
738 if ((ret = av_reallocp(&st->codec->extradata,
739 st->codec->extradata_size +
740 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
741 st->codec->extradata_size = 0;
744 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
747 st->codec->height = FFABS(st->codec->height);
749 // avio_skip(pb, size - 5 * 4);
751 case AVMEDIA_TYPE_AUDIO:
752 ret = ff_get_wav_header(pb, st->codec, size);
755 ast->dshow_block_align = st->codec->block_align;
756 if (ast->sample_size && st->codec->block_align &&
757 ast->sample_size != st->codec->block_align) {
760 "sample size (%d) != block align (%d)\n",
762 st->codec->block_align);
763 ast->sample_size = st->codec->block_align;
766 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
769 /* Force parsing as several audio frames can be in
770 * one packet and timestamps refer to packet start. */
771 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
772 /* ADTS header is in extradata, AAC without header must be
773 * stored as exact frames. Parser not needed and it will
775 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
776 st->codec->extradata_size)
777 st->need_parsing = AVSTREAM_PARSE_NONE;
778 /* AVI files with Xan DPCM audio (wrongly) declare PCM
779 * audio in the header but have Axan as stream_code_tag. */
780 if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
781 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
782 st->codec->codec_tag = 0;
783 ast->dshow_block_align = 0;
785 if (amv_file_format) {
786 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
787 ast->dshow_block_align = 0;
789 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
790 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
791 ast->dshow_block_align = 0;
793 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
794 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
795 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
796 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
797 ast->sample_size = 0;
800 case AVMEDIA_TYPE_SUBTITLE:
801 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
802 st->request_probe= 1;
806 st->codec->codec_type = AVMEDIA_TYPE_DATA;
807 st->codec->codec_id = AV_CODEC_ID_NONE;
808 st->codec->codec_tag = 0;
814 case MKTAG('s', 't', 'r', 'd'):
815 if (stream_index >= (unsigned)s->nb_streams
816 || s->streams[stream_index]->codec->extradata_size
817 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
820 uint64_t cur_pos = avio_tell(pb);
821 if (cur_pos < list_end)
822 size = FFMIN(size, list_end - cur_pos);
823 st = s->streams[stream_index];
826 if (ff_get_extradata(st->codec, pb, size) < 0)
827 return AVERROR(ENOMEM);
830 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
834 case MKTAG('i', 'n', 'd', 'x'):
836 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
838 read_braindead_odml_indx(s, 0) < 0 &&
839 (s->error_recognition & AV_EF_EXPLODE))
841 avio_seek(pb, i + size, SEEK_SET);
843 case MKTAG('v', 'p', 'r', 'p'):
844 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
845 AVRational active, active_aspect;
847 st = s->streams[stream_index];
854 active_aspect.den = avio_rl16(pb);
855 active_aspect.num = avio_rl16(pb);
856 active.num = avio_rl32(pb);
857 active.den = avio_rl32(pb);
858 avio_rl32(pb); // nbFieldsPerFrame
860 if (active_aspect.num && active_aspect.den &&
861 active.num && active.den) {
862 st->sample_aspect_ratio = av_div_q(active_aspect, active);
863 av_dlog(s, "vprp %d/%d %d/%d\n",
864 active_aspect.num, active_aspect.den,
865 active.num, active.den);
871 case MKTAG('s', 't', 'r', 'n'):
873 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
879 if (size > 1000000) {
880 av_log(s, AV_LOG_ERROR,
881 "Something went wrong during header parsing, "
882 "I will ignore it and try to continue anyway.\n");
883 if (s->error_recognition & AV_EF_EXPLODE)
885 avi->movi_list = avio_tell(pb) - 4;
886 avi->movi_end = avi->fsize;
897 /* check stream number */
898 if (stream_index != s->nb_streams - 1) {
901 return AVERROR_INVALIDDATA;
904 if (!avi->index_loaded && pb->seekable)
906 calculate_bitrate(s);
907 avi->index_loaded |= 1;
908 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
910 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
911 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
912 for (i = 0; i < s->nb_streams; i++) {
913 AVStream *st = s->streams[i];
914 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
915 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
916 st->need_parsing = AVSTREAM_PARSE_FULL;
919 for (i = 0; i < s->nb_streams; i++) {
920 AVStream *st = s->streams[i];
921 if (st->nb_index_entries)
924 // DV-in-AVI cannot be non-interleaved, if set this must be
927 avi->non_interleaved = 0;
928 if (i == s->nb_streams && avi->non_interleaved) {
929 av_log(s, AV_LOG_WARNING,
930 "Non-interleaved AVI without index, switching to interleaved\n");
931 avi->non_interleaved = 0;
934 if (avi->non_interleaved) {
935 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
939 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
940 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
945 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
947 if (pkt->size >= 7 &&
948 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
949 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
951 int score = AVPROBE_SCORE_EXTENSION, ret;
952 AVIStream *ast = st->priv_data;
953 AVInputFormat *sub_demuxer;
954 AVRational time_base;
956 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
958 0, NULL, NULL, NULL, NULL);
960 unsigned int desc_len = avio_rl32(pb);
962 if (desc_len > pb->buf_end - pb->buf_ptr)
965 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
966 avio_skip(pb, desc_len - ret);
968 av_dict_set(&st->metadata, "title", desc, 0);
970 avio_rl16(pb); /* flags? */
971 avio_rl32(pb); /* data size */
973 size = pb->buf_end - pb->buf_ptr;
974 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
978 memcpy(pd.buf, pb->buf_ptr, size);
979 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
984 if (!(ast->sub_ctx = avformat_alloc_context()))
987 ast->sub_ctx->pb = pb;
988 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
989 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
990 *st->codec = *ast->sub_ctx->streams[0]->codec;
991 ast->sub_ctx->streams[0]->codec->extradata = NULL;
992 time_base = ast->sub_ctx->streams[0]->time_base;
993 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
995 ast->sub_buffer = pkt->data;
996 memset(pkt, 0, sizeof(*pkt));
1005 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1008 AVIStream *ast, *next_ast = next_st->priv_data;
1009 int64_t ts, next_ts, ts_min = INT64_MAX;
1010 AVStream *st, *sub_st = NULL;
1013 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1016 for (i = 0; i < s->nb_streams; i++) {
1018 ast = st->priv_data;
1019 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1020 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1021 if (ts <= next_ts && ts < ts_min) {
1029 ast = sub_st->priv_data;
1030 *pkt = ast->sub_pkt;
1031 pkt->stream_index = sub_st->index;
1033 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1034 ast->sub_pkt.data = NULL;
1039 static int get_stream_idx(unsigned *d)
1041 if (d[0] >= '0' && d[0] <= '9' &&
1042 d[1] >= '0' && d[1] <= '9') {
1043 return (d[0] - '0') * 10 + (d[1] - '0');
1045 return 100; // invalid stream ID
1051 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1053 static int avi_sync(AVFormatContext *s, int exit_early)
1055 AVIContext *avi = s->priv_data;
1056 AVIOContext *pb = s->pb;
1063 memset(d, -1, sizeof(d));
1064 for (i = sync = avio_tell(pb); !url_feof(pb); i++) {
1067 for (j = 0; j < 7; j++)
1071 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1073 n = get_stream_idx(d + 2);
1074 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1075 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1076 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1080 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1082 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1083 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1084 avio_skip(pb, size);
1089 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1094 n = avi->dv_demux ? 0 : get_stream_idx(d);
1096 if (!((i - avi->last_pkt_pos) & 1) &&
1097 get_stream_idx(d + 1) < s->nb_streams)
1100 // detect ##ix chunk and skip
1101 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1102 avio_skip(pb, size);
1107 if (n < s->nb_streams) {
1111 ast = st->priv_data;
1114 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
1118 if (s->nb_streams >= 2) {
1119 AVStream *st1 = s->streams[1];
1120 AVIStream *ast1 = st1->priv_data;
1121 // workaround for broken small-file-bug402.avi
1122 if ( d[2] == 'w' && d[3] == 'b'
1124 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1125 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1126 && ast->prefix == 'd'*256+'c'
1127 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1132 av_log(s, AV_LOG_WARNING,
1133 "Invalid stream + prefix combination, assuming audio.\n");
1137 if (!avi->dv_demux &&
1138 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1139 // FIXME: needs a little reordering
1140 (st->discard >= AVDISCARD_NONKEY &&
1141 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1142 || st->discard >= AVDISCARD_ALL)) {
1144 ast->frame_offset += get_duration(ast, size);
1145 avio_skip(pb, size);
1150 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1151 int k = avio_r8(pb);
1152 int last = (k + avio_r8(pb) - 1) & 0xFF;
1154 avio_rl16(pb); // flags
1156 // b + (g << 8) + (r << 16);
1157 for (; k <= last; k++)
1158 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1162 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1163 d[2] < 128 && d[3] < 128) ||
1164 d[2] * 256 + d[3] == ast->prefix /* ||
1165 (d[2] == 'd' && d[3] == 'c') ||
1166 (d[2] == 'w' && d[3] == 'b') */) {
1169 if (d[2] * 256 + d[3] == ast->prefix)
1170 ast->prefix_count++;
1172 ast->prefix = d[2] * 256 + d[3];
1173 ast->prefix_count = 0;
1176 avi->stream_index = n;
1177 ast->packet_size = size + 8;
1178 ast->remaining = size;
1180 if (size || !ast->sample_size) {
1181 uint64_t pos = avio_tell(pb) - 8;
1182 if (!st->index_entries || !st->nb_index_entries ||
1183 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1184 av_add_index_entry(st, pos, ast->frame_offset, size,
1185 0, AVINDEX_KEYFRAME);
1198 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1200 AVIContext *avi = s->priv_data;
1201 AVIOContext *pb = s->pb;
1203 #if FF_API_DESTRUCT_PACKET
1207 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1208 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1215 if (avi->non_interleaved) {
1216 int best_stream_index = 0;
1217 AVStream *best_st = NULL;
1218 AVIStream *best_ast;
1219 int64_t best_ts = INT64_MAX;
1222 for (i = 0; i < s->nb_streams; i++) {
1223 AVStream *st = s->streams[i];
1224 AVIStream *ast = st->priv_data;
1225 int64_t ts = ast->frame_offset;
1228 if (!st->nb_index_entries)
1231 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1232 if (!ast->remaining && ts > last_ts)
1235 ts = av_rescale_q(ts, st->time_base,
1236 (AVRational) { FFMAX(1, ast->sample_size),
1239 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1240 st->time_base.num, st->time_base.den, ast->frame_offset);
1244 best_stream_index = i;
1250 best_ast = best_st->priv_data;
1251 best_ts = best_ast->frame_offset;
1252 if (best_ast->remaining) {
1253 i = av_index_search_timestamp(best_st,
1256 AVSEEK_FLAG_BACKWARD);
1258 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1260 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1264 int64_t pos = best_st->index_entries[i].pos;
1265 pos += best_ast->packet_size - best_ast->remaining;
1266 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1269 av_assert0(best_ast->remaining <= best_ast->packet_size);
1271 avi->stream_index = best_stream_index;
1272 if (!best_ast->remaining)
1273 best_ast->packet_size =
1274 best_ast->remaining = best_st->index_entries[i].size;
1281 if (avi->stream_index >= 0) {
1282 AVStream *st = s->streams[avi->stream_index];
1283 AVIStream *ast = st->priv_data;
1286 if (get_subtitle_pkt(s, st, pkt))
1289 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1290 if (ast->sample_size <= 1)
1292 else if (ast->sample_size < 32)
1293 // arbitrary multiplier to avoid tiny packets for raw PCM data
1294 size = 1024 * ast->sample_size;
1296 size = ast->sample_size;
1298 if (size > ast->remaining)
1299 size = ast->remaining;
1300 avi->last_pkt_pos = avio_tell(pb);
1301 err = av_get_packet(pb, pkt, size);
1306 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1308 pal = av_packet_new_side_data(pkt,
1309 AV_PKT_DATA_PALETTE,
1312 av_log(s, AV_LOG_ERROR,
1313 "Failed to allocate data for palette\n");
1315 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1320 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1321 AVBufferRef *avbuf = pkt->buf;
1322 #if FF_API_DESTRUCT_PACKET
1323 FF_DISABLE_DEPRECATION_WARNINGS
1324 dstr = pkt->destruct;
1325 FF_ENABLE_DEPRECATION_WARNINGS
1327 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1328 pkt->data, pkt->size, pkt->pos);
1329 #if FF_API_DESTRUCT_PACKET
1330 FF_DISABLE_DEPRECATION_WARNINGS
1331 pkt->destruct = dstr;
1332 FF_ENABLE_DEPRECATION_WARNINGS
1335 pkt->flags |= AV_PKT_FLAG_KEY;
1337 av_free_packet(pkt);
1338 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1339 !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1340 ast->frame_offset++;
1341 avi->stream_index = -1;
1345 /* XXX: How to handle B-frames in AVI? */
1346 pkt->dts = ast->frame_offset;
1347 // pkt->dts += ast->start;
1348 if (ast->sample_size)
1349 pkt->dts /= ast->sample_size;
1351 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1352 "base:%d st:%d size:%d\n",
1361 pkt->stream_index = avi->stream_index;
1363 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1367 index = av_index_search_timestamp(st, ast->frame_offset, 0);
1368 e = &st->index_entries[index];
1370 if (index >= 0 && e->timestamp == ast->frame_offset) {
1371 if (index == st->nb_index_entries-1) {
1375 for (i=0; i<FFMIN(size,256); i++) {
1376 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1377 if (state == 0x1B6) {
1378 key= !(pkt->data[i]&0xC0);
1383 state= (state<<8) + pkt->data[i];
1386 e->flags &= ~AVINDEX_KEYFRAME;
1388 if (e->flags & AVINDEX_KEYFRAME)
1389 pkt->flags |= AV_PKT_FLAG_KEY;
1392 pkt->flags |= AV_PKT_FLAG_KEY;
1394 ast->frame_offset += get_duration(ast, pkt->size);
1396 ast->remaining -= err;
1397 if (!ast->remaining) {
1398 avi->stream_index = -1;
1399 ast->packet_size = 0;
1402 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1403 av_free_packet(pkt);
1408 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1409 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1411 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1412 avi->non_interleaved= 1;
1413 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1414 }else if (avi->dts_max < dts)
1421 if ((err = avi_sync(s, 0)) < 0)
1426 /* XXX: We make the implicit supposition that the positions are sorted
1427 * for each stream. */
1428 static int avi_read_idx1(AVFormatContext *s, int size)
1430 AVIContext *avi = s->priv_data;
1431 AVIOContext *pb = s->pb;
1432 int nb_index_entries, i;
1435 unsigned int index, tag, flags, pos, len, first_packet = 1;
1436 unsigned last_pos = -1;
1437 unsigned last_idx = -1;
1438 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1441 nb_index_entries = size / 16;
1442 if (nb_index_entries <= 0)
1443 return AVERROR_INVALIDDATA;
1445 idx1_pos = avio_tell(pb);
1446 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1447 if (avi_sync(s, 1) == 0)
1448 first_packet_pos = avio_tell(pb) - 8;
1449 avi->stream_index = -1;
1450 avio_seek(pb, idx1_pos, SEEK_SET);
1452 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1453 first_packet_pos = 0;
1454 data_offset = avi->movi_list;
1457 /* Read the entries and sort them in each stream component. */
1458 for (i = 0; i < nb_index_entries; i++) {
1462 tag = avio_rl32(pb);
1463 flags = avio_rl32(pb);
1464 pos = avio_rl32(pb);
1465 len = avio_rl32(pb);
1466 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1467 i, tag, flags, pos, len);
1469 index = ((tag & 0xff) - '0') * 10;
1470 index += (tag >> 8 & 0xff) - '0';
1471 if (index >= s->nb_streams)
1473 st = s->streams[index];
1474 ast = st->priv_data;
1476 if (first_packet && first_packet_pos) {
1477 data_offset = first_packet_pos - pos;
1482 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1484 // even if we have only a single stream, we should
1485 // switch to non-interleaved to get correct timestamps
1486 if (last_pos == pos)
1487 avi->non_interleaved = 1;
1488 if (last_idx != pos && len) {
1489 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1490 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1493 ast->cum_len += get_duration(ast, len);
1495 anykey |= flags&AVIIF_INDEX;
1498 for (index = 0; index < s->nb_streams; index++) {
1499 st = s->streams[index];
1500 if (st->nb_index_entries)
1501 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1507 static int guess_ni_flag(AVFormatContext *s)
1510 int64_t last_start = 0;
1511 int64_t first_end = INT64_MAX;
1512 int64_t oldpos = avio_tell(s->pb);
1514 int64_t min_pos, pos;
1516 for (i = 0; i < s->nb_streams; i++) {
1517 AVStream *st = s->streams[i];
1518 int n = st->nb_index_entries;
1525 int64_t pos = st->index_entries[0].pos;
1526 avio_seek(s->pb, pos + 4, SEEK_SET);
1527 size = avio_rl32(s->pb);
1528 if (pos + size > st->index_entries[1].pos)
1529 last_start = INT64_MAX;
1532 if (st->index_entries[0].pos > last_start)
1533 last_start = st->index_entries[0].pos;
1534 if (st->index_entries[n - 1].pos < first_end)
1535 first_end = st->index_entries[n - 1].pos;
1537 avio_seek(s->pb, oldpos, SEEK_SET);
1538 if (last_start > first_end)
1540 idx= av_calloc(s->nb_streams, sizeof(*idx));
1543 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
1544 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
1545 int64_t max_buffer = 0;
1546 min_pos = INT64_MAX;
1548 for (i=0; i<s->nb_streams; i++) {
1549 AVStream *st = s->streams[i];
1550 AVIStream *ast = st->priv_data;
1551 int n= st->nb_index_entries;
1552 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
1555 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));
1556 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1559 for (i=0; i<s->nb_streams; i++) {
1560 AVStream *st = s->streams[i];
1561 AVIStream *ast = st->priv_data;
1563 if (idx[i] && min_dts != INT64_MAX/2) {
1564 int64_t dts = av_rescale_q(st->index_entries[idx[i]-1].timestamp/FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q);
1565 max_dts = FFMAX(max_dts, dts);
1566 max_buffer = FFMAX(max_buffer, av_rescale(dts - min_dts, st->codec->bit_rate, AV_TIME_BASE));
1569 if (max_dts - min_dts > 2*AV_TIME_BASE ||
1570 max_buffer > 1024 * 1024 * 8 *8
1580 static int avi_load_index(AVFormatContext *s)
1582 AVIContext *avi = s->priv_data;
1583 AVIOContext *pb = s->pb;
1585 int64_t pos = avio_tell(pb);
1589 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1590 goto the_end; // maybe truncated file
1591 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1593 tag = avio_rl32(pb);
1594 size = avio_rl32(pb);
1597 next = avio_tell(pb) + size + (size & 1);
1599 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1606 if (tag == MKTAG('i', 'd', 'x', '1') &&
1607 avi_read_idx1(s, size) >= 0) {
1608 avi->index_loaded=2;
1610 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1611 uint32_t tag1 = avio_rl32(pb);
1613 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1614 ff_read_riff_info(s, size - 4);
1618 if (avio_seek(pb, next, SEEK_SET) < 0)
1619 break; // something is wrong here
1623 avio_seek(pb, pos, SEEK_SET);
1627 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1629 AVIStream *ast2 = st2->priv_data;
1630 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1631 av_free_packet(&ast2->sub_pkt);
1632 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1633 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1634 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1637 static int avi_read_seek(AVFormatContext *s, int stream_index,
1638 int64_t timestamp, int flags)
1640 AVIContext *avi = s->priv_data;
1643 int64_t pos, pos_min;
1646 /* Does not matter which stream is requested dv in avi has the
1647 * stream information in the first video stream.
1652 if (!avi->index_loaded) {
1653 /* we only load the index on demand */
1655 avi->index_loaded |= 1;
1657 av_assert0(stream_index >= 0);
1659 st = s->streams[stream_index];
1660 ast = st->priv_data;
1661 index = av_index_search_timestamp(st,
1662 timestamp * FFMAX(ast->sample_size, 1),
1665 if (st->nb_index_entries > 0)
1666 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1667 timestamp * FFMAX(ast->sample_size, 1),
1668 st->index_entries[0].timestamp,
1669 st->index_entries[st->nb_index_entries - 1].timestamp);
1670 return AVERROR_INVALIDDATA;
1673 /* find the position */
1674 pos = st->index_entries[index].pos;
1675 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1677 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1678 timestamp, index, st->index_entries[index].timestamp);
1680 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1681 /* One and only one real stream for DV in AVI, and it has video */
1682 /* offsets. Calling with other stream indexes should have failed */
1683 /* the av_index_search_timestamp call above. */
1685 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1688 /* Feed the DV video stream version of the timestamp to the */
1689 /* DV demux so it can synthesize correct timestamps. */
1690 ff_dv_offset_reset(avi->dv_demux, timestamp);
1692 avi->stream_index = -1;
1697 for (i = 0; i < s->nb_streams; i++) {
1698 AVStream *st2 = s->streams[i];
1699 AVIStream *ast2 = st2->priv_data;
1702 ast2->remaining = 0;
1704 if (ast2->sub_ctx) {
1705 seek_subtitle(st, st2, timestamp);
1709 if (st2->nb_index_entries <= 0)
1712 // av_assert1(st2->codec->block_align);
1713 av_assert0((int64_t)st2->time_base.num * ast2->rate ==
1714 (int64_t)st2->time_base.den * ast2->scale);
1715 index = av_index_search_timestamp(st2,
1716 av_rescale_q(timestamp,
1719 FFMAX(ast2->sample_size, 1),
1721 AVSEEK_FLAG_BACKWARD |
1722 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1725 ast2->seek_pos = st2->index_entries[index].pos;
1726 pos_min = FFMIN(pos_min,ast2->seek_pos);
1728 for (i = 0; i < s->nb_streams; i++) {
1729 AVStream *st2 = s->streams[i];
1730 AVIStream *ast2 = st2->priv_data;
1732 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1735 index = av_index_search_timestamp(
1737 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1738 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1741 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1743 ast2->frame_offset = st2->index_entries[index].timestamp;
1747 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1748 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1751 avi->stream_index = -1;
1752 avi->dts_max = INT_MIN;
1756 static int avi_read_close(AVFormatContext *s)
1759 AVIContext *avi = s->priv_data;
1761 for (i = 0; i < s->nb_streams; i++) {
1762 AVStream *st = s->streams[i];
1763 AVIStream *ast = st->priv_data;
1766 av_freep(&ast->sub_ctx->pb);
1767 avformat_close_input(&ast->sub_ctx);
1769 av_free(ast->sub_buffer);
1770 av_free_packet(&ast->sub_pkt);
1774 av_free(avi->dv_demux);
1779 static int avi_probe(AVProbeData *p)
1783 /* check file header */
1784 for (i = 0; avi_headers[i][0]; i++)
1785 if (!memcmp(p->buf, avi_headers[i], 4) &&
1786 !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1787 return AVPROBE_SCORE_MAX;
1792 AVInputFormat ff_avi_demuxer = {
1794 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1795 .priv_data_size = sizeof(AVIContext),
1796 .read_probe = avi_probe,
1797 .read_header = avi_read_header,
1798 .read_packet = avi_read_packet,
1799 .read_close = avi_read_close,
1800 .read_seek = avi_read_seek,
1801 .priv_class = &demuxer_class,