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 -= avio_read(s->pb, buffer,
354 FFMIN(size, sizeof(buffer) - 1));
363 name = "creation_time";
364 if (buffer[4] == ':' && buffer[7] == ':')
365 buffer[4] = buffer[7] = '-';
369 av_dict_set(&s->metadata, name, buffer, 0);
370 avio_skip(s->pb, size);
375 avio_skip(s->pb, size);
381 static int avi_read_header(AVFormatContext *s)
383 AVIContext *avi = s->priv_data;
384 AVIOContext *pb = s->pb;
385 unsigned int tag, tag1, handler;
386 int codec_type, stream_index, frame_period;
390 AVIStream *ast = NULL;
391 int avih_width = 0, avih_height = 0;
392 int amv_file_format = 0;
393 uint64_t list_end = 0;
395 AVDictionaryEntry *dict_entry;
397 avi->stream_index = -1;
399 ret = get_riff(s, pb);
403 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
405 avi->io_fsize = avi->fsize = avio_size(pb);
406 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
407 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
417 size = avio_rl32(pb);
419 print_tag("tag", tag, size);
422 case MKTAG('L', 'I', 'S', 'T'):
423 list_end = avio_tell(pb) + size;
424 /* Ignored, except at start of video packets. */
425 tag1 = avio_rl32(pb);
427 print_tag("list", tag1, 0);
429 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
430 avi->movi_list = avio_tell(pb) - 4;
432 avi->movi_end = avi->movi_list + size + (size & 1);
434 avi->movi_end = avi->fsize;
435 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
437 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
438 ff_read_riff_info(s, size - 4);
439 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
440 avi_read_nikon(s, list_end);
443 case MKTAG('I', 'D', 'I', 'T'):
445 unsigned char date[64] = { 0 };
447 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
449 avi_metadata_creation_time(&s->metadata, date);
452 case MKTAG('d', 'm', 'l', 'h'):
454 avio_skip(pb, size + (size & 1));
456 case MKTAG('a', 'm', 'v', 'h'):
458 case MKTAG('a', 'v', 'i', 'h'):
460 /* using frame_period is bad idea */
461 frame_period = avio_rl32(pb);
462 avio_rl32(pb); /* max. bytes per second */
464 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
466 avio_skip(pb, 2 * 4);
469 avih_width = avio_rl32(pb);
470 avih_height = avio_rl32(pb);
472 avio_skip(pb, size - 10 * 4);
474 case MKTAG('s', 't', 'r', 'h'):
477 tag1 = avio_rl32(pb);
478 handler = avio_rl32(pb); /* codec tag */
480 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
481 avio_skip(pb, size - 8);
485 st = avformat_new_stream(s, NULL);
489 st->id = stream_index;
490 ast = av_mallocz(sizeof(AVIStream));
496 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
497 : MKTAG('v', 'i', 'd', 's');
499 print_tag("strh", tag1, -1);
501 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
502 tag1 == MKTAG('i', 'v', 'a', 's')) {
505 /* After some consideration -- I don't think we
506 * have to support anything but DV in type1 AVIs. */
507 if (s->nb_streams != 1)
510 if (handler != MKTAG('d', 'v', 's', 'd') &&
511 handler != MKTAG('d', 'v', 'h', 'd') &&
512 handler != MKTAG('d', 'v', 's', 'l'))
515 ast = s->streams[0]->priv_data;
516 av_freep(&s->streams[0]->codec->extradata);
517 av_freep(&s->streams[0]->codec);
518 if (s->streams[0]->info)
519 av_freep(&s->streams[0]->info->duration_error);
520 av_freep(&s->streams[0]->info);
521 av_freep(&s->streams[0]);
523 if (CONFIG_DV_DEMUXER) {
524 avi->dv_demux = avpriv_dv_init_demux(s);
529 s->streams[0]->priv_data = ast;
530 avio_skip(pb, 3 * 4);
531 ast->scale = avio_rl32(pb);
532 ast->rate = avio_rl32(pb);
533 avio_skip(pb, 4); /* start time */
535 dv_dur = avio_rl32(pb);
536 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
537 dv_dur *= AV_TIME_BASE;
538 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
540 /* else, leave duration alone; timing estimation in utils.c
541 * will make a guess based on bitrate. */
543 stream_index = s->nb_streams - 1;
544 avio_skip(pb, size - 9 * 4);
548 av_assert0(stream_index < s->nb_streams);
549 st->codec->stream_codec_tag = handler;
551 avio_rl32(pb); /* flags */
552 avio_rl16(pb); /* priority */
553 avio_rl16(pb); /* language */
554 avio_rl32(pb); /* initial frame */
555 ast->scale = avio_rl32(pb);
556 ast->rate = avio_rl32(pb);
557 if (!(ast->scale && ast->rate)) {
558 av_log(s, AV_LOG_WARNING,
559 "scale/rate is %u/%u which is invalid. "
560 "(This file has been generated by broken software.)\n",
565 ast->scale = frame_period;
571 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
573 ast->cum_len = avio_rl32(pb); /* start */
574 st->nb_frames = avio_rl32(pb);
577 avio_rl32(pb); /* buffer size */
578 avio_rl32(pb); /* quality */
579 if (ast->cum_len*ast->scale/ast->rate > 3600) {
580 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
581 return AVERROR_INVALIDDATA;
583 ast->sample_size = avio_rl32(pb); /* sample ssize */
584 ast->cum_len *= FFMAX(1, ast->sample_size);
585 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
586 ast->rate, ast->scale, ast->sample_size);
589 case MKTAG('v', 'i', 'd', 's'):
590 codec_type = AVMEDIA_TYPE_VIDEO;
592 ast->sample_size = 0;
594 case MKTAG('a', 'u', 'd', 's'):
595 codec_type = AVMEDIA_TYPE_AUDIO;
597 case MKTAG('t', 'x', 't', 's'):
598 codec_type = AVMEDIA_TYPE_SUBTITLE;
600 case MKTAG('d', 'a', 't', 's'):
601 codec_type = AVMEDIA_TYPE_DATA;
604 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
606 if (ast->sample_size == 0) {
607 st->duration = st->nb_frames;
608 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
609 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
610 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
613 ast->frame_offset = ast->cum_len;
614 avio_skip(pb, size - 12 * 4);
616 case MKTAG('s', 't', 'r', 'f'):
620 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
623 uint64_t cur_pos = avio_tell(pb);
625 if (cur_pos < list_end)
626 size = FFMIN(size, list_end - cur_pos);
627 st = s->streams[stream_index];
628 if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
632 switch (codec_type) {
633 case AVMEDIA_TYPE_VIDEO:
634 if (amv_file_format) {
635 st->codec->width = avih_width;
636 st->codec->height = avih_height;
637 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
638 st->codec->codec_id = AV_CODEC_ID_AMV;
642 tag1 = ff_get_bmp_header(pb, st, &esize);
644 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
645 tag1 == MKTAG('D', 'X', 'S', 'A')) {
646 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
647 st->codec->codec_tag = tag1;
648 st->codec->codec_id = AV_CODEC_ID_XSUB;
652 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
653 if (esize == size-1 && (esize&1)) {
654 st->codec->extradata_size = esize - 10 * 4;
656 st->codec->extradata_size = size - 10 * 4;
657 if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
658 return AVERROR(ENOMEM);
661 // FIXME: check if the encoder really did this correctly
662 if (st->codec->extradata_size & 1)
665 /* Extract palette from extradata if bpp <= 8.
666 * This code assumes that extradata contains only palette.
667 * This is true for all paletted codecs implemented in
669 if (st->codec->extradata_size &&
670 (st->codec->bits_per_coded_sample <= 8)) {
671 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
672 const uint8_t *pal_src;
674 pal_size = FFMIN(pal_size, st->codec->extradata_size);
675 pal_src = st->codec->extradata +
676 st->codec->extradata_size - pal_size;
677 for (i = 0; i < pal_size / 4; i++)
678 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
682 print_tag("video", tag1, 0);
684 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
685 st->codec->codec_tag = tag1;
686 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
688 /* This is needed to get the pict type which is necessary
689 * for generating correct pts. */
690 st->need_parsing = AVSTREAM_PARSE_HEADERS;
691 if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
692 st->need_parsing = AVSTREAM_PARSE_FULL;
694 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
695 st->codec->extradata_size < 1U << 30) {
696 st->codec->extradata_size += 9;
697 if ((ret = av_reallocp(&st->codec->extradata,
698 st->codec->extradata_size +
699 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
700 st->codec->extradata_size = 0;
703 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
706 st->codec->height = FFABS(st->codec->height);
708 // avio_skip(pb, size - 5 * 4);
710 case AVMEDIA_TYPE_AUDIO:
711 ret = ff_get_wav_header(pb, st->codec, size);
714 ast->dshow_block_align = st->codec->block_align;
715 if (ast->sample_size && st->codec->block_align &&
716 ast->sample_size != st->codec->block_align) {
719 "sample size (%d) != block align (%d)\n",
721 st->codec->block_align);
722 ast->sample_size = st->codec->block_align;
725 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
728 /* Force parsing as several audio frames can be in
729 * one packet and timestamps refer to packet start. */
730 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
731 /* ADTS header is in extradata, AAC without header must be
732 * stored as exact frames. Parser not needed and it will
734 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
735 st->codec->extradata_size)
736 st->need_parsing = AVSTREAM_PARSE_NONE;
737 /* AVI files with Xan DPCM audio (wrongly) declare PCM
738 * audio in the header but have Axan as stream_code_tag. */
739 if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
740 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
741 st->codec->codec_tag = 0;
742 ast->dshow_block_align = 0;
744 if (amv_file_format) {
745 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
746 ast->dshow_block_align = 0;
748 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
749 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
750 ast->dshow_block_align = 0;
752 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
753 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
754 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
755 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
756 ast->sample_size = 0;
759 case AVMEDIA_TYPE_SUBTITLE:
760 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
761 st->request_probe= 1;
765 st->codec->codec_type = AVMEDIA_TYPE_DATA;
766 st->codec->codec_id = AV_CODEC_ID_NONE;
767 st->codec->codec_tag = 0;
773 case MKTAG('s', 't', 'r', 'd'):
774 if (stream_index >= (unsigned)s->nb_streams
775 || s->streams[stream_index]->codec->extradata_size
776 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
779 uint64_t cur_pos = avio_tell(pb);
780 if (cur_pos < list_end)
781 size = FFMIN(size, list_end - cur_pos);
782 st = s->streams[stream_index];
785 if (ff_get_extradata(st->codec, pb, size) < 0)
786 return AVERROR(ENOMEM);
789 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
793 case MKTAG('i', 'n', 'd', 'x'):
795 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
797 read_braindead_odml_indx(s, 0) < 0 &&
798 (s->error_recognition & AV_EF_EXPLODE))
800 avio_seek(pb, i + size, SEEK_SET);
802 case MKTAG('v', 'p', 'r', 'p'):
803 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
804 AVRational active, active_aspect;
806 st = s->streams[stream_index];
813 active_aspect.den = avio_rl16(pb);
814 active_aspect.num = avio_rl16(pb);
815 active.num = avio_rl32(pb);
816 active.den = avio_rl32(pb);
817 avio_rl32(pb); // nbFieldsPerFrame
819 if (active_aspect.num && active_aspect.den &&
820 active.num && active.den) {
821 st->sample_aspect_ratio = av_div_q(active_aspect, active);
822 av_dlog(s, "vprp %d/%d %d/%d\n",
823 active_aspect.num, active_aspect.den,
824 active.num, active.den);
830 case MKTAG('s', 't', 'r', 'n'):
832 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
838 if (size > 1000000) {
839 av_log(s, AV_LOG_ERROR,
840 "Something went wrong during header parsing, "
841 "I will ignore it and try to continue anyway.\n");
842 if (s->error_recognition & AV_EF_EXPLODE)
844 avi->movi_list = avio_tell(pb) - 4;
845 avi->movi_end = avi->fsize;
856 /* check stream number */
857 if (stream_index != s->nb_streams - 1) {
860 return AVERROR_INVALIDDATA;
863 if (!avi->index_loaded && pb->seekable)
865 avi->index_loaded |= 1;
866 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
868 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
869 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
870 for (i = 0; i < s->nb_streams; i++) {
871 AVStream *st = s->streams[i];
872 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
873 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
874 st->need_parsing = AVSTREAM_PARSE_FULL;
877 for (i = 0; i < s->nb_streams; i++) {
878 AVStream *st = s->streams[i];
879 if (st->nb_index_entries)
882 // DV-in-AVI cannot be non-interleaved, if set this must be
885 avi->non_interleaved = 0;
886 if (i == s->nb_streams && avi->non_interleaved) {
887 av_log(s, AV_LOG_WARNING,
888 "Non-interleaved AVI without index, switching to interleaved\n");
889 avi->non_interleaved = 0;
892 if (avi->non_interleaved) {
893 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
897 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
898 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
903 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
905 if (pkt->size >= 7 &&
906 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
908 int score = AVPROBE_SCORE_EXTENSION, ret;
909 AVIStream *ast = st->priv_data;
910 AVInputFormat *sub_demuxer;
911 AVRational time_base;
912 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
914 0, NULL, NULL, NULL, NULL);
916 unsigned int desc_len = avio_rl32(pb);
918 if (desc_len > pb->buf_end - pb->buf_ptr)
921 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
922 avio_skip(pb, desc_len - ret);
924 av_dict_set(&st->metadata, "title", desc, 0);
926 avio_rl16(pb); /* flags? */
927 avio_rl32(pb); /* data size */
929 pd = (AVProbeData) { .buf = pb->buf_ptr,
930 .buf_size = pb->buf_end - pb->buf_ptr };
931 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
934 if (!(ast->sub_ctx = avformat_alloc_context()))
937 ast->sub_ctx->pb = pb;
938 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
939 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
940 *st->codec = *ast->sub_ctx->streams[0]->codec;
941 ast->sub_ctx->streams[0]->codec->extradata = NULL;
942 time_base = ast->sub_ctx->streams[0]->time_base;
943 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
945 ast->sub_buffer = pkt->data;
946 memset(pkt, 0, sizeof(*pkt));
955 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
958 AVIStream *ast, *next_ast = next_st->priv_data;
959 int64_t ts, next_ts, ts_min = INT64_MAX;
960 AVStream *st, *sub_st = NULL;
963 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
966 for (i = 0; i < s->nb_streams; i++) {
969 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
970 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
971 if (ts <= next_ts && ts < ts_min) {
979 ast = sub_st->priv_data;
981 pkt->stream_index = sub_st->index;
983 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
984 ast->sub_pkt.data = NULL;
989 static int get_stream_idx(unsigned *d)
991 if (d[0] >= '0' && d[0] <= '9' &&
992 d[1] >= '0' && d[1] <= '9') {
993 return (d[0] - '0') * 10 + (d[1] - '0');
995 return 100; // invalid stream ID
1001 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1003 static int avi_sync(AVFormatContext *s, int exit_early)
1005 AVIContext *avi = s->priv_data;
1006 AVIOContext *pb = s->pb;
1013 memset(d, -1, sizeof(d));
1014 for (i = sync = avio_tell(pb); !url_feof(pb); i++) {
1017 for (j = 0; j < 7; j++)
1021 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1023 n = get_stream_idx(d + 2);
1024 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1025 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1026 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1030 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1032 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1033 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1034 avio_skip(pb, size);
1039 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1044 n = avi->dv_demux ? 0 : get_stream_idx(d);
1046 if (!((i - avi->last_pkt_pos) & 1) &&
1047 get_stream_idx(d + 1) < s->nb_streams)
1050 // detect ##ix chunk and skip
1051 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1052 avio_skip(pb, size);
1057 if (n < s->nb_streams) {
1061 ast = st->priv_data;
1064 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
1068 if (s->nb_streams >= 2) {
1069 AVStream *st1 = s->streams[1];
1070 AVIStream *ast1 = st1->priv_data;
1071 // workaround for broken small-file-bug402.avi
1072 if ( d[2] == 'w' && d[3] == 'b'
1074 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1075 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1076 && ast->prefix == 'd'*256+'c'
1077 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1082 av_log(s, AV_LOG_WARNING,
1083 "Invalid stream + prefix combination, assuming audio.\n");
1087 if (!avi->dv_demux &&
1088 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1089 // FIXME: needs a little reordering
1090 (st->discard >= AVDISCARD_NONKEY &&
1091 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1092 || st->discard >= AVDISCARD_ALL)) {
1094 ast->frame_offset += get_duration(ast, size);
1095 avio_skip(pb, size);
1100 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1101 int k = avio_r8(pb);
1102 int last = (k + avio_r8(pb) - 1) & 0xFF;
1104 avio_rl16(pb); // flags
1106 // b + (g << 8) + (r << 16);
1107 for (; k <= last; k++)
1108 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1112 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1113 d[2] < 128 && d[3] < 128) ||
1114 d[2] * 256 + d[3] == ast->prefix /* ||
1115 (d[2] == 'd' && d[3] == 'c') ||
1116 (d[2] == 'w' && d[3] == 'b') */) {
1119 if (d[2] * 256 + d[3] == ast->prefix)
1120 ast->prefix_count++;
1122 ast->prefix = d[2] * 256 + d[3];
1123 ast->prefix_count = 0;
1126 avi->stream_index = n;
1127 ast->packet_size = size + 8;
1128 ast->remaining = size;
1130 if (size || !ast->sample_size) {
1131 uint64_t pos = avio_tell(pb) - 8;
1132 if (!st->index_entries || !st->nb_index_entries ||
1133 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1134 av_add_index_entry(st, pos, ast->frame_offset, size,
1135 0, AVINDEX_KEYFRAME);
1148 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1150 AVIContext *avi = s->priv_data;
1151 AVIOContext *pb = s->pb;
1153 #if FF_API_DESTRUCT_PACKET
1157 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1158 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1165 if (avi->non_interleaved) {
1166 int best_stream_index = 0;
1167 AVStream *best_st = NULL;
1168 AVIStream *best_ast;
1169 int64_t best_ts = INT64_MAX;
1172 for (i = 0; i < s->nb_streams; i++) {
1173 AVStream *st = s->streams[i];
1174 AVIStream *ast = st->priv_data;
1175 int64_t ts = ast->frame_offset;
1178 if (!st->nb_index_entries)
1181 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1182 if (!ast->remaining && ts > last_ts)
1185 ts = av_rescale_q(ts, st->time_base,
1186 (AVRational) { FFMAX(1, ast->sample_size),
1189 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1190 st->time_base.num, st->time_base.den, ast->frame_offset);
1194 best_stream_index = i;
1200 best_ast = best_st->priv_data;
1201 best_ts = best_ast->frame_offset;
1202 if (best_ast->remaining) {
1203 i = av_index_search_timestamp(best_st,
1206 AVSEEK_FLAG_BACKWARD);
1208 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1210 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1214 int64_t pos = best_st->index_entries[i].pos;
1215 pos += best_ast->packet_size - best_ast->remaining;
1216 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1219 av_assert0(best_ast->remaining <= best_ast->packet_size);
1221 avi->stream_index = best_stream_index;
1222 if (!best_ast->remaining)
1223 best_ast->packet_size =
1224 best_ast->remaining = best_st->index_entries[i].size;
1231 if (avi->stream_index >= 0) {
1232 AVStream *st = s->streams[avi->stream_index];
1233 AVIStream *ast = st->priv_data;
1236 if (get_subtitle_pkt(s, st, pkt))
1239 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1240 if (ast->sample_size <= 1)
1242 else if (ast->sample_size < 32)
1243 // arbitrary multiplier to avoid tiny packets for raw PCM data
1244 size = 1024 * ast->sample_size;
1246 size = ast->sample_size;
1248 if (size > ast->remaining)
1249 size = ast->remaining;
1250 avi->last_pkt_pos = avio_tell(pb);
1251 err = av_get_packet(pb, pkt, size);
1256 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1258 pal = av_packet_new_side_data(pkt,
1259 AV_PKT_DATA_PALETTE,
1262 av_log(s, AV_LOG_ERROR,
1263 "Failed to allocate data for palette\n");
1265 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1270 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1271 AVBufferRef *avbuf = pkt->buf;
1272 #if FF_API_DESTRUCT_PACKET
1273 FF_DISABLE_DEPRECATION_WARNINGS
1274 dstr = pkt->destruct;
1275 FF_ENABLE_DEPRECATION_WARNINGS
1277 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1278 pkt->data, pkt->size, pkt->pos);
1279 #if FF_API_DESTRUCT_PACKET
1280 FF_DISABLE_DEPRECATION_WARNINGS
1281 pkt->destruct = dstr;
1282 FF_ENABLE_DEPRECATION_WARNINGS
1285 pkt->flags |= AV_PKT_FLAG_KEY;
1287 av_free_packet(pkt);
1288 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1289 !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1290 ast->frame_offset++;
1291 avi->stream_index = -1;
1295 /* XXX: How to handle B-frames in AVI? */
1296 pkt->dts = ast->frame_offset;
1297 // pkt->dts += ast->start;
1298 if (ast->sample_size)
1299 pkt->dts /= ast->sample_size;
1301 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1302 "base:%d st:%d size:%d\n",
1311 pkt->stream_index = avi->stream_index;
1313 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1317 index = av_index_search_timestamp(st, ast->frame_offset, 0);
1318 e = &st->index_entries[index];
1320 if (index >= 0 && e->timestamp == ast->frame_offset) {
1321 if (index == st->nb_index_entries-1) {
1325 for (i=0; i<FFMIN(size,256); i++) {
1326 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1327 if (state == 0x1B6) {
1328 key= !(pkt->data[i]&0xC0);
1333 state= (state<<8) + pkt->data[i];
1336 e->flags &= ~AVINDEX_KEYFRAME;
1338 if (e->flags & AVINDEX_KEYFRAME)
1339 pkt->flags |= AV_PKT_FLAG_KEY;
1342 pkt->flags |= AV_PKT_FLAG_KEY;
1344 ast->frame_offset += get_duration(ast, pkt->size);
1346 ast->remaining -= err;
1347 if (!ast->remaining) {
1348 avi->stream_index = -1;
1349 ast->packet_size = 0;
1352 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1353 av_free_packet(pkt);
1358 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1359 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1361 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1362 avi->non_interleaved= 1;
1363 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1364 }else if (avi->dts_max < dts)
1371 if ((err = avi_sync(s, 0)) < 0)
1376 /* XXX: We make the implicit supposition that the positions are sorted
1377 * for each stream. */
1378 static int avi_read_idx1(AVFormatContext *s, int size)
1380 AVIContext *avi = s->priv_data;
1381 AVIOContext *pb = s->pb;
1382 int nb_index_entries, i;
1385 unsigned int index, tag, flags, pos, len, first_packet = 1;
1386 unsigned last_pos = -1;
1387 unsigned last_idx = -1;
1388 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1391 nb_index_entries = size / 16;
1392 if (nb_index_entries <= 0)
1393 return AVERROR_INVALIDDATA;
1395 idx1_pos = avio_tell(pb);
1396 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1397 if (avi_sync(s, 1) == 0)
1398 first_packet_pos = avio_tell(pb) - 8;
1399 avi->stream_index = -1;
1400 avio_seek(pb, idx1_pos, SEEK_SET);
1402 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1403 first_packet_pos = 0;
1404 data_offset = avi->movi_list;
1407 /* Read the entries and sort them in each stream component. */
1408 for (i = 0; i < nb_index_entries; i++) {
1412 tag = avio_rl32(pb);
1413 flags = avio_rl32(pb);
1414 pos = avio_rl32(pb);
1415 len = avio_rl32(pb);
1416 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1417 i, tag, flags, pos, len);
1419 index = ((tag & 0xff) - '0') * 10;
1420 index += (tag >> 8 & 0xff) - '0';
1421 if (index >= s->nb_streams)
1423 st = s->streams[index];
1424 ast = st->priv_data;
1426 if (first_packet && first_packet_pos) {
1427 data_offset = first_packet_pos - pos;
1432 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1434 // even if we have only a single stream, we should
1435 // switch to non-interleaved to get correct timestamps
1436 if (last_pos == pos)
1437 avi->non_interleaved = 1;
1438 if (last_idx != pos && len) {
1439 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1440 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1443 ast->cum_len += get_duration(ast, len);
1445 anykey |= flags&AVIIF_INDEX;
1448 for (index = 0; index < s->nb_streams; index++) {
1449 st = s->streams[index];
1450 if (st->nb_index_entries)
1451 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1457 static int guess_ni_flag(AVFormatContext *s)
1460 int64_t last_start = 0;
1461 int64_t first_end = INT64_MAX;
1462 int64_t oldpos = avio_tell(s->pb);
1464 int64_t min_pos, pos;
1466 for (i = 0; i < s->nb_streams; i++) {
1467 AVStream *st = s->streams[i];
1468 int n = st->nb_index_entries;
1475 int64_t pos = st->index_entries[0].pos;
1476 avio_seek(s->pb, pos + 4, SEEK_SET);
1477 size = avio_rl32(s->pb);
1478 if (pos + size > st->index_entries[1].pos)
1479 last_start = INT64_MAX;
1482 if (st->index_entries[0].pos > last_start)
1483 last_start = st->index_entries[0].pos;
1484 if (st->index_entries[n - 1].pos < first_end)
1485 first_end = st->index_entries[n - 1].pos;
1487 avio_seek(s->pb, oldpos, SEEK_SET);
1488 if (last_start > first_end)
1490 idx= av_calloc(s->nb_streams, sizeof(*idx));
1493 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
1494 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
1495 min_pos = INT64_MAX;
1497 for (i=0; i<s->nb_streams; i++) {
1498 AVStream *st = s->streams[i];
1499 AVIStream *ast = st->priv_data;
1500 int n= st->nb_index_entries;
1501 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
1504 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));
1505 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1508 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));
1510 if (max_dts - min_dts > 2*AV_TIME_BASE) {
1519 static int avi_load_index(AVFormatContext *s)
1521 AVIContext *avi = s->priv_data;
1522 AVIOContext *pb = s->pb;
1524 int64_t pos = avio_tell(pb);
1528 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1529 goto the_end; // maybe truncated file
1530 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1532 tag = avio_rl32(pb);
1533 size = avio_rl32(pb);
1536 next = avio_tell(pb) + size + (size & 1);
1538 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1545 if (tag == MKTAG('i', 'd', 'x', '1') &&
1546 avi_read_idx1(s, size) >= 0) {
1547 avi->index_loaded=2;
1549 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1550 uint32_t tag1 = avio_rl32(pb);
1552 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1553 ff_read_riff_info(s, size - 4);
1557 if (avio_seek(pb, next, SEEK_SET) < 0)
1558 break; // something is wrong here
1562 avio_seek(pb, pos, SEEK_SET);
1566 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1568 AVIStream *ast2 = st2->priv_data;
1569 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1570 av_free_packet(&ast2->sub_pkt);
1571 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1572 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1573 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1576 static int avi_read_seek(AVFormatContext *s, int stream_index,
1577 int64_t timestamp, int flags)
1579 AVIContext *avi = s->priv_data;
1582 int64_t pos, pos_min;
1585 /* Does not matter which stream is requested dv in avi has the
1586 * stream information in the first video stream.
1591 if (!avi->index_loaded) {
1592 /* we only load the index on demand */
1594 avi->index_loaded |= 1;
1596 av_assert0(stream_index >= 0);
1598 st = s->streams[stream_index];
1599 ast = st->priv_data;
1600 index = av_index_search_timestamp(st,
1601 timestamp * FFMAX(ast->sample_size, 1),
1604 if (st->nb_index_entries > 0)
1605 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1606 timestamp * FFMAX(ast->sample_size, 1),
1607 st->index_entries[0].timestamp,
1608 st->index_entries[st->nb_index_entries - 1].timestamp);
1609 return AVERROR_INVALIDDATA;
1612 /* find the position */
1613 pos = st->index_entries[index].pos;
1614 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1616 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1617 timestamp, index, st->index_entries[index].timestamp);
1619 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1620 /* One and only one real stream for DV in AVI, and it has video */
1621 /* offsets. Calling with other stream indexes should have failed */
1622 /* the av_index_search_timestamp call above. */
1624 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1627 /* Feed the DV video stream version of the timestamp to the */
1628 /* DV demux so it can synthesize correct timestamps. */
1629 ff_dv_offset_reset(avi->dv_demux, timestamp);
1631 avi->stream_index = -1;
1636 for (i = 0; i < s->nb_streams; i++) {
1637 AVStream *st2 = s->streams[i];
1638 AVIStream *ast2 = st2->priv_data;
1641 ast2->remaining = 0;
1643 if (ast2->sub_ctx) {
1644 seek_subtitle(st, st2, timestamp);
1648 if (st2->nb_index_entries <= 0)
1651 // av_assert1(st2->codec->block_align);
1652 av_assert0((int64_t)st2->time_base.num * ast2->rate ==
1653 (int64_t)st2->time_base.den * ast2->scale);
1654 index = av_index_search_timestamp(st2,
1655 av_rescale_q(timestamp,
1658 FFMAX(ast2->sample_size, 1),
1660 AVSEEK_FLAG_BACKWARD |
1661 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1664 ast2->seek_pos = st2->index_entries[index].pos;
1665 pos_min = FFMIN(pos_min,ast2->seek_pos);
1667 for (i = 0; i < s->nb_streams; i++) {
1668 AVStream *st2 = s->streams[i];
1669 AVIStream *ast2 = st2->priv_data;
1671 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1674 index = av_index_search_timestamp(
1676 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1677 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1680 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1682 ast2->frame_offset = st2->index_entries[index].timestamp;
1686 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1687 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1690 avi->stream_index = -1;
1691 avi->dts_max = INT_MIN;
1695 static int avi_read_close(AVFormatContext *s)
1698 AVIContext *avi = s->priv_data;
1700 for (i = 0; i < s->nb_streams; i++) {
1701 AVStream *st = s->streams[i];
1702 AVIStream *ast = st->priv_data;
1705 av_freep(&ast->sub_ctx->pb);
1706 avformat_close_input(&ast->sub_ctx);
1708 av_free(ast->sub_buffer);
1709 av_free_packet(&ast->sub_pkt);
1713 av_free(avi->dv_demux);
1718 static int avi_probe(AVProbeData *p)
1722 /* check file header */
1723 for (i = 0; avi_headers[i][0]; i++)
1724 if (!memcmp(p->buf, avi_headers[i], 4) &&
1725 !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1726 return AVPROBE_SCORE_MAX;
1731 AVInputFormat ff_avi_demuxer = {
1733 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1734 .priv_data_size = sizeof(AVIContext),
1735 .read_probe = avi_probe,
1736 .read_header = avi_read_header,
1737 .read_packet = avi_read_packet,
1738 .read_close = avi_read_close,
1739 .read_seek = avi_read_seek,
1740 .priv_class = &demuxer_class,