3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/bswap.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/avassert.h"
35 typedef struct AVIStream {
36 int64_t frame_offset; /* current frame (video) or byte (audio) counter
37 (used to compute the pts) */
43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45 int64_t cum_len; /* temporary storage (used during seek) */
47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
51 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
53 AVFormatContext *sub_ctx;
72 DVDemuxContext* dv_demux;
75 #define MAX_ODML_DEPTH 1000
80 static const AVOption options[] = {
81 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
85 static const AVClass demuxer_class = {
87 .item_name = av_default_item_name,
89 .version = LIBAVUTIL_VERSION_INT,
90 .category = AV_CLASS_CATEGORY_DEMUXER,
94 static const char avi_headers[][8] = {
95 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
96 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
97 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
98 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
99 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
103 static const AVMetadataConv avi_metadata_conv[] = {
108 static int avi_load_index(AVFormatContext *s);
109 static int guess_ni_flag(AVFormatContext *s);
111 #define print_tag(str, tag, size) \
112 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
115 (tag >> 16) & 0xff, \
116 (tag >> 24) & 0xff, \
119 static inline int get_duration(AVIStream *ast, int len){
120 if(ast->sample_size){
122 }else if (ast->dshow_block_align){
123 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
128 static int get_riff(AVFormatContext *s, AVIOContext *pb)
130 AVIContext *avi = s->priv_data;
134 /* check RIFF header */
135 avio_read(pb, header, 4);
136 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
137 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
138 avio_read(pb, header+4, 4);
140 for(i=0; avi_headers[i][0]; i++)
141 if(!memcmp(header, avi_headers[i], 8))
143 if(!avi_headers[i][0])
144 return AVERROR_INVALIDDATA;
146 if(header[7] == 0x19)
147 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
152 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
153 AVIContext *avi = s->priv_data;
154 AVIOContext *pb = s->pb;
155 int longs_pre_entry= avio_rl16(pb);
156 int index_sub_type = avio_r8(pb);
157 int index_type = avio_r8(pb);
158 int entries_in_use = avio_rl32(pb);
159 int chunk_id = avio_rl32(pb);
160 int64_t base = avio_rl64(pb);
161 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
165 int64_t last_pos= -1;
166 int64_t filesize= avi->fsize;
168 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
169 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
171 if(stream_id >= s->nb_streams || stream_id < 0)
172 return AVERROR_INVALIDDATA;
173 st= s->streams[stream_id];
177 return AVERROR_INVALIDDATA;
181 if(index_type && longs_pre_entry != 2)
182 return AVERROR_INVALIDDATA;
184 return AVERROR_INVALIDDATA;
186 if(filesize > 0 && base >= filesize){
187 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
188 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
191 return AVERROR_INVALIDDATA;
194 for(i=0; i<entries_in_use; i++){
196 int64_t pos= avio_rl32(pb) + base - 8;
197 int len = avio_rl32(pb);
202 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
205 return AVERROR_INVALIDDATA;
207 if(last_pos == pos || pos == base - 8)
208 avi->non_interleaved= 1;
209 if(last_pos != pos && (len || !ast->sample_size))
210 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
212 ast->cum_len += get_duration(ast, len);
217 offset = avio_rl64(pb);
218 avio_rl32(pb); /* size */
219 duration = avio_rl32(pb);
222 return AVERROR_INVALIDDATA;
226 if(avi->odml_depth > MAX_ODML_DEPTH){
227 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
228 return AVERROR_INVALIDDATA;
231 if(avio_seek(pb, offset+8, SEEK_SET) < 0)
234 read_braindead_odml_indx(s, frame_num);
236 frame_num += duration;
238 if(avio_seek(pb, pos, SEEK_SET) < 0) {
239 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
249 static void clean_index(AVFormatContext *s){
253 for(i=0; i<s->nb_streams; i++){
254 AVStream *st = s->streams[i];
255 AVIStream *ast = st->priv_data;
256 int n= st->nb_index_entries;
257 int max= ast->sample_size;
258 int64_t pos, size, ts;
260 if(n != 1 || ast->sample_size==0)
263 while(max < 1024) max+=max;
265 pos= st->index_entries[0].pos;
266 size= st->index_entries[0].size;
267 ts= st->index_entries[0].timestamp;
269 for(j=0; j<size; j+=max){
270 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
275 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
277 AVIOContext *pb = s->pb;
278 char key[5] = {0}, *value;
282 if (size == UINT_MAX)
283 return AVERROR(EINVAL);
284 value = av_malloc(size+1);
286 return AVERROR(ENOMEM);
287 avio_read(pb, value, size);
292 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
293 AV_DICT_DONT_STRDUP_VAL);
296 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
297 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
299 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
301 char month[4], time[9], buffer[64];
303 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
304 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
305 month, &day, time, &year) == 4) {
307 if (!av_strcasecmp(month, months[i])) {
308 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
309 year, i+1, day, time);
310 av_dict_set(metadata, "creation_time", buffer, 0);
312 } else if (date[4] == '/' && date[7] == '/') {
313 date[4] = date[7] = '-';
314 av_dict_set(metadata, "creation_time", date, 0);
318 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
320 while (avio_tell(s->pb) < end) {
321 uint32_t tag = avio_rl32(s->pb);
322 uint32_t size = avio_rl32(s->pb);
324 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
325 uint64_t tag_end = avio_tell(s->pb) + size;
326 while (avio_tell(s->pb) < tag_end) {
327 uint16_t tag = avio_rl16(s->pb);
328 uint16_t size = avio_rl16(s->pb);
329 const char *name = NULL;
330 char buffer[64] = {0};
331 size -= avio_read(s->pb, buffer,
332 FFMIN(size, sizeof(buffer)-1));
334 case 0x03: name = "maker"; break;
335 case 0x04: name = "model"; break;
336 case 0x13: name = "creation_time";
337 if (buffer[4] == ':' && buffer[7] == ':')
338 buffer[4] = buffer[7] = '-';
342 av_dict_set(&s->metadata, name, buffer, 0);
343 avio_skip(s->pb, size);
348 avio_skip(s->pb, size);
354 static int avi_read_header(AVFormatContext *s)
356 AVIContext *avi = s->priv_data;
357 AVIOContext *pb = s->pb;
358 unsigned int tag, tag1, handler;
359 int codec_type, stream_index, frame_period;
363 AVIStream *ast = NULL;
364 int avih_width=0, avih_height=0;
365 int amv_file_format=0;
366 uint64_t list_end = 0;
368 AVDictionaryEntry *dict_entry;
370 avi->stream_index= -1;
372 ret = get_riff(s, pb);
376 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
378 avi->io_fsize = avi->fsize = avio_size(pb);
379 if(avi->fsize<=0 || avi->fsize < avi->riff_end)
380 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
390 size = avio_rl32(pb);
392 print_tag("tag", tag, size);
395 case MKTAG('L', 'I', 'S', 'T'):
396 list_end = avio_tell(pb) + size;
397 /* Ignored, except at start of video packets. */
398 tag1 = avio_rl32(pb);
400 print_tag("list", tag1, 0);
402 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
403 avi->movi_list = avio_tell(pb) - 4;
404 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
405 else avi->movi_end = avi->fsize;
406 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
409 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
410 ff_read_riff_info(s, size - 4);
411 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
412 avi_read_nikon(s, list_end);
415 case MKTAG('I', 'D', 'I', 'T'): {
416 unsigned char date[64] = {0};
418 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
420 avi_metadata_creation_time(&s->metadata, date);
423 case MKTAG('d', 'm', 'l', 'h'):
425 avio_skip(pb, size + (size & 1));
427 case MKTAG('a', 'm', 'v', 'h'):
429 case MKTAG('a', 'v', 'i', 'h'):
431 /* using frame_period is bad idea */
432 frame_period = avio_rl32(pb);
433 avio_rl32(pb); /* max. bytes per second */
435 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
437 avio_skip(pb, 2 * 4);
440 avih_width=avio_rl32(pb);
441 avih_height=avio_rl32(pb);
443 avio_skip(pb, size - 10 * 4);
445 case MKTAG('s', 't', 'r', 'h'):
448 tag1 = avio_rl32(pb);
449 handler = avio_rl32(pb); /* codec tag */
451 if(tag1 == MKTAG('p', 'a', 'd', 's')){
452 avio_skip(pb, size - 8);
456 st = avformat_new_stream(s, NULL);
460 st->id = stream_index;
461 ast = av_mallocz(sizeof(AVIStream));
467 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
469 print_tag("strh", tag1, -1);
471 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
475 * After some consideration -- I don't think we
476 * have to support anything but DV in type1 AVIs.
478 if (s->nb_streams != 1)
481 if (handler != MKTAG('d', 'v', 's', 'd') &&
482 handler != MKTAG('d', 'v', 'h', 'd') &&
483 handler != MKTAG('d', 'v', 's', 'l'))
486 ast = s->streams[0]->priv_data;
487 av_freep(&s->streams[0]->codec->extradata);
488 av_freep(&s->streams[0]->codec);
489 if (s->streams[0]->info)
490 av_freep(&s->streams[0]->info->duration_error);
491 av_freep(&s->streams[0]->info);
492 av_freep(&s->streams[0]);
494 if (CONFIG_DV_DEMUXER) {
495 avi->dv_demux = avpriv_dv_init_demux(s);
499 s->streams[0]->priv_data = ast;
500 avio_skip(pb, 3 * 4);
501 ast->scale = avio_rl32(pb);
502 ast->rate = avio_rl32(pb);
503 avio_skip(pb, 4); /* start time */
505 dv_dur = avio_rl32(pb);
506 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
507 dv_dur *= AV_TIME_BASE;
508 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
511 * else, leave duration alone; timing estimation in utils.c
512 * will make a guess based on bitrate.
515 stream_index = s->nb_streams - 1;
516 avio_skip(pb, size - 9*4);
520 av_assert0(stream_index < s->nb_streams);
521 st->codec->stream_codec_tag= handler;
523 avio_rl32(pb); /* flags */
524 avio_rl16(pb); /* priority */
525 avio_rl16(pb); /* language */
526 avio_rl32(pb); /* initial frame */
527 ast->scale = avio_rl32(pb);
528 ast->rate = avio_rl32(pb);
529 if(!(ast->scale && ast->rate)){
530 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
533 ast->scale = frame_period;
539 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
541 ast->cum_len=avio_rl32(pb); /* start */
542 st->nb_frames = avio_rl32(pb);
545 avio_rl32(pb); /* buffer size */
546 avio_rl32(pb); /* quality */
547 if (ast->cum_len*ast->scale/ast->rate > 3600) {
548 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
549 return AVERROR_INVALIDDATA;
551 ast->sample_size = avio_rl32(pb); /* sample ssize */
552 ast->cum_len *= FFMAX(1, ast->sample_size);
553 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
554 ast->rate, ast->scale, ast->sample_size);
557 case MKTAG('v', 'i', 'd', 's'):
558 codec_type = AVMEDIA_TYPE_VIDEO;
560 ast->sample_size = 0;
562 case MKTAG('a', 'u', 'd', 's'):
563 codec_type = AVMEDIA_TYPE_AUDIO;
565 case MKTAG('t', 'x', 't', 's'):
566 codec_type = AVMEDIA_TYPE_SUBTITLE;
568 case MKTAG('d', 'a', 't', 's'):
569 codec_type = AVMEDIA_TYPE_DATA;
572 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
574 if(ast->sample_size == 0) {
575 st->duration = st->nb_frames;
576 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
577 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
578 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
581 ast->frame_offset= ast->cum_len;
582 avio_skip(pb, size - 12 * 4);
584 case MKTAG('s', 't', 'r', 'f'):
588 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
591 uint64_t cur_pos = avio_tell(pb);
593 if (cur_pos < list_end)
594 size = FFMIN(size, list_end - cur_pos);
595 st = s->streams[stream_index];
597 case AVMEDIA_TYPE_VIDEO:
599 st->codec->width=avih_width;
600 st->codec->height=avih_height;
601 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
602 st->codec->codec_id = AV_CODEC_ID_AMV;
606 tag1 = ff_get_bmp_header(pb, st, &esize);
608 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
609 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
610 st->codec->codec_tag = tag1;
611 st->codec->codec_id = AV_CODEC_ID_XSUB;
615 if(size > 10*4 && size<(1<<30) && size < avi->fsize){
616 if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4;
617 else st->codec->extradata_size= size - 10*4;
618 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
619 if (!st->codec->extradata) {
620 st->codec->extradata_size= 0;
621 return AVERROR(ENOMEM);
623 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
626 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
629 /* Extract palette from extradata if bpp <= 8. */
630 /* This code assumes that extradata contains only palette. */
631 /* This is true for all paletted codecs implemented in FFmpeg. */
632 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
633 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
634 const uint8_t *pal_src;
636 pal_size = FFMIN(pal_size, st->codec->extradata_size);
637 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
638 for (i = 0; i < pal_size/4; i++)
639 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
643 print_tag("video", tag1, 0);
645 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
646 st->codec->codec_tag = tag1;
647 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
648 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
650 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
651 st->codec->extradata_size+= 9;
652 st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
653 if(st->codec->extradata)
654 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
656 st->codec->height= FFABS(st->codec->height);
658 // avio_skip(pb, size - 5 * 4);
660 case AVMEDIA_TYPE_AUDIO:
661 ret = ff_get_wav_header(pb, st->codec, size);
664 ast->dshow_block_align= st->codec->block_align;
665 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
666 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
667 ast->sample_size= st->codec->block_align;
669 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
671 /* Force parsing as several audio frames can be in
672 * one packet and timestamps refer to packet start. */
673 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
674 /* ADTS header is in extradata, AAC without header must be
675 * stored as exact frames. Parser not needed and it will
677 if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size)
678 st->need_parsing = AVSTREAM_PARSE_NONE;
679 /* AVI files with Xan DPCM audio (wrongly) declare PCM
680 * audio in the header but have Axan as stream_code_tag. */
681 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
682 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
683 st->codec->codec_tag = 0;
684 ast->dshow_block_align = 0;
686 if (amv_file_format){
687 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
688 ast->dshow_block_align = 0;
690 if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
691 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
692 ast->dshow_block_align = 0;
694 if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
695 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
696 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
697 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
698 ast->sample_size = 0;
701 case AVMEDIA_TYPE_SUBTITLE:
702 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
703 st->request_probe= 1;
707 st->codec->codec_type = AVMEDIA_TYPE_DATA;
708 st->codec->codec_id= AV_CODEC_ID_NONE;
709 st->codec->codec_tag= 0;
715 case MKTAG('s', 't', 'r', 'd'):
716 if (stream_index >= (unsigned)s->nb_streams
717 || s->streams[stream_index]->codec->extradata_size
718 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
721 uint64_t cur_pos = avio_tell(pb);
722 if (cur_pos < list_end)
723 size = FFMIN(size, list_end - cur_pos);
724 st = s->streams[stream_index];
727 st->codec->extradata_size= size;
728 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
729 if (!st->codec->extradata) {
730 st->codec->extradata_size= 0;
731 return AVERROR(ENOMEM);
733 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
736 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
740 case MKTAG('i', 'n', 'd', 'x'):
742 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&
743 read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE))
745 avio_seek(pb, i+size, SEEK_SET);
747 case MKTAG('v', 'p', 'r', 'p'):
748 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
749 AVRational active, active_aspect;
751 st = s->streams[stream_index];
758 active_aspect.den= avio_rl16(pb);
759 active_aspect.num= avio_rl16(pb);
760 active.num = avio_rl32(pb);
761 active.den = avio_rl32(pb);
762 avio_rl32(pb); //nbFieldsPerFrame
764 if(active_aspect.num && active_aspect.den && active.num && active.den){
765 st->sample_aspect_ratio= av_div_q(active_aspect, active);
766 av_dlog(s, "vprp %d/%d %d/%d\n",
767 active_aspect.num, active_aspect.den,
768 active.num, active.den);
774 case MKTAG('s', 't', 'r', 'n'):
776 ret = avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
783 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
784 "I will ignore it and try to continue anyway.\n");
785 if (s->error_recognition & AV_EF_EXPLODE)
787 avi->movi_list = avio_tell(pb) - 4;
788 avi->movi_end = avi->fsize;
798 /* check stream number */
799 if (stream_index != s->nb_streams - 1) {
801 return AVERROR_INVALIDDATA;
804 if(!avi->index_loaded && pb->seekable)
806 avi->index_loaded |= 1;
807 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
809 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
810 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
811 for (i=0; i<s->nb_streams; i++) {
812 AVStream *st = s->streams[i];
813 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
814 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
815 st->need_parsing = AVSTREAM_PARSE_FULL;
818 for(i=0; i<s->nb_streams; i++){
819 AVStream *st = s->streams[i];
820 if(st->nb_index_entries)
823 // DV-in-AVI cannot be non-interleaved, if set this must be
826 avi->non_interleaved=0;
827 if(i==s->nb_streams && avi->non_interleaved) {
828 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
829 avi->non_interleaved=0;
832 if(avi->non_interleaved) {
833 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
837 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
838 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
843 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
844 if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
846 int score = AVPROBE_SCORE_EXTENSION, ret;
847 AVIStream *ast = st->priv_data;
848 AVInputFormat *sub_demuxer;
849 AVRational time_base;
850 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
852 0, NULL, NULL, NULL, NULL);
854 unsigned int desc_len = avio_rl32(pb);
856 if (desc_len > pb->buf_end - pb->buf_ptr)
859 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
860 avio_skip(pb, desc_len - ret);
862 av_dict_set(&st->metadata, "title", desc, 0);
864 avio_rl16(pb); /* flags? */
865 avio_rl32(pb); /* data size */
867 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
868 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
871 if (!(ast->sub_ctx = avformat_alloc_context()))
874 ast->sub_ctx->pb = pb;
875 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
876 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
877 *st->codec = *ast->sub_ctx->streams[0]->codec;
878 ast->sub_ctx->streams[0]->codec->extradata = NULL;
879 time_base = ast->sub_ctx->streams[0]->time_base;
880 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
882 ast->sub_buffer = pkt->data;
883 memset(pkt, 0, sizeof(*pkt));
891 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
894 AVIStream *ast, *next_ast = next_st->priv_data;
895 int64_t ts, next_ts, ts_min = INT64_MAX;
896 AVStream *st, *sub_st = NULL;
899 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
902 for (i=0; i<s->nb_streams; i++) {
905 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
906 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
907 if (ts <= next_ts && ts < ts_min) {
915 ast = sub_st->priv_data;
917 pkt->stream_index = sub_st->index;
918 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
919 ast->sub_pkt.data = NULL;
924 static int get_stream_idx(int *d){
925 if( d[0] >= '0' && d[0] <= '9'
926 && d[1] >= '0' && d[1] <= '9'){
927 return (d[0] - '0') * 10 + (d[1] - '0');
929 return 100; //invalid stream ID
935 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
937 static int avi_sync(AVFormatContext *s, int exit_early)
939 AVIContext *avi = s->priv_data;
940 AVIOContext *pb = s->pb;
947 memset(d, -1, sizeof(d));
948 for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
955 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
957 n= get_stream_idx(d+2);
958 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
959 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
960 if(i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
964 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
966 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
967 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
973 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
978 n= get_stream_idx(d);
980 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
983 //detect ##ix chunk and skip
984 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
990 if(n < s->nb_streams){
997 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
1001 if(s->nb_streams>=2){
1002 AVStream *st1 = s->streams[1];
1003 AVIStream *ast1= st1->priv_data;
1004 //workaround for broken small-file-bug402.avi
1005 if( d[2] == 'w' && d[3] == 'b'
1007 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1008 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1009 && ast->prefix == 'd'*256+'c'
1010 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1015 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1020 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1021 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1022 || st->discard >= AVDISCARD_ALL){
1024 ast->frame_offset += get_duration(ast, size);
1025 avio_skip(pb, size);
1030 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1031 int k = avio_r8(pb);
1032 int last = (k + avio_r8(pb) - 1) & 0xFF;
1034 avio_rl16(pb); //flags
1036 for (; k <= last; k++)
1037 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1040 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1041 d[2]*256+d[3] == ast->prefix /*||
1042 (d[2] == 'd' && d[3] == 'c') ||
1043 (d[2] == 'w' && d[3] == 'b')*/) {
1047 if(d[2]*256+d[3] == ast->prefix)
1048 ast->prefix_count++;
1050 ast->prefix= d[2]*256+d[3];
1051 ast->prefix_count= 0;
1054 avi->stream_index= n;
1055 ast->packet_size= size + 8;
1056 ast->remaining= size;
1058 if(size || !ast->sample_size){
1059 uint64_t pos= avio_tell(pb) - 8;
1060 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1061 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1074 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1076 AVIContext *avi = s->priv_data;
1077 AVIOContext *pb = s->pb;
1079 #if FF_API_DESTRUCT_PACKET
1083 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1084 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1089 if(avi->non_interleaved){
1090 int best_stream_index = 0;
1091 AVStream *best_st= NULL;
1092 AVIStream *best_ast;
1093 int64_t best_ts= INT64_MAX;
1096 for(i=0; i<s->nb_streams; i++){
1097 AVStream *st = s->streams[i];
1098 AVIStream *ast = st->priv_data;
1099 int64_t ts= ast->frame_offset;
1102 if(!st->nb_index_entries)
1105 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1106 if(!ast->remaining && ts > last_ts)
1109 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
1111 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1112 st->time_base.num, st->time_base.den, ast->frame_offset);
1116 best_stream_index= i;
1122 best_ast = best_st->priv_data;
1123 best_ts = best_ast->frame_offset;
1124 if(best_ast->remaining)
1125 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
1127 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1129 best_ast->frame_offset= best_st->index_entries[i].timestamp;
1133 int64_t pos= best_st->index_entries[i].pos;
1134 pos += best_ast->packet_size - best_ast->remaining;
1135 if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1138 av_assert0(best_ast->remaining <= best_ast->packet_size);
1140 avi->stream_index= best_stream_index;
1141 if(!best_ast->remaining)
1142 best_ast->packet_size=
1143 best_ast->remaining= best_st->index_entries[i].size;
1150 if(avi->stream_index >= 0){
1151 AVStream *st= s->streams[ avi->stream_index ];
1152 AVIStream *ast= st->priv_data;
1155 if(get_subtitle_pkt(s, st, pkt))
1158 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1160 else if(ast->sample_size < 32)
1161 // arbitrary multiplier to avoid tiny packets for raw PCM data
1162 size= 1024*ast->sample_size;
1164 size= ast->sample_size;
1166 if(size > ast->remaining)
1167 size= ast->remaining;
1168 avi->last_pkt_pos= avio_tell(pb);
1169 err= av_get_packet(pb, pkt, size);
1174 if(ast->has_pal && pkt->size<(unsigned)INT_MAX/2){
1176 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
1178 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
1180 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1185 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1186 AVBufferRef *avbuf = pkt->buf;
1187 #if FF_API_DESTRUCT_PACKET
1188 dstr = pkt->destruct;
1190 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1191 pkt->data, pkt->size, pkt->pos);
1192 #if FF_API_DESTRUCT_PACKET
1193 pkt->destruct = dstr;
1196 pkt->flags |= AV_PKT_FLAG_KEY;
1198 av_free_packet(pkt);
1199 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
1200 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1201 ast->frame_offset++;
1202 avi->stream_index = -1;
1206 /* XXX: How to handle B-frames in AVI? */
1207 pkt->dts = ast->frame_offset;
1208 // pkt->dts += ast->start;
1209 if(ast->sample_size)
1210 pkt->dts /= ast->sample_size;
1211 av_dlog(s, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n",
1212 pkt->dts, ast->frame_offset, ast->scale, ast->rate,
1213 ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
1214 pkt->stream_index = avi->stream_index;
1216 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1219 av_assert0(st->index_entries);
1221 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1222 e= &st->index_entries[index];
1224 if(index >= 0 && e->timestamp == ast->frame_offset){
1225 if (index == st->nb_index_entries-1){
1229 for(i=0; i<FFMIN(size,256); i++){
1230 if(st->codec->codec_id == AV_CODEC_ID_MPEG4){
1232 key= !(pkt->data[i]&0xC0);
1237 state= (state<<8) + pkt->data[i];
1240 e->flags &= ~AVINDEX_KEYFRAME;
1242 if (e->flags & AVINDEX_KEYFRAME)
1243 pkt->flags |= AV_PKT_FLAG_KEY;
1246 pkt->flags |= AV_PKT_FLAG_KEY;
1248 ast->frame_offset += get_duration(ast, pkt->size);
1250 ast->remaining -= err;
1251 if(!ast->remaining){
1252 avi->stream_index= -1;
1253 ast->packet_size= 0;
1256 if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
1257 av_free_packet(pkt);
1262 if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){
1263 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1265 if(avi->dts_max - dts > 2*AV_TIME_BASE){
1266 avi->non_interleaved= 1;
1267 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1268 }else if(avi->dts_max < dts)
1275 if ((err = avi_sync(s, 0)) < 0)
1280 /* XXX: We make the implicit supposition that the positions are sorted
1282 static int avi_read_idx1(AVFormatContext *s, int size)
1284 AVIContext *avi = s->priv_data;
1285 AVIOContext *pb = s->pb;
1286 int nb_index_entries, i;
1289 unsigned int index, tag, flags, pos, len, first_packet = 1;
1290 unsigned last_pos= -1;
1291 unsigned last_idx= -1;
1292 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1295 nb_index_entries = size / 16;
1296 if (nb_index_entries <= 0)
1297 return AVERROR_INVALIDDATA;
1299 idx1_pos = avio_tell(pb);
1300 avio_seek(pb, avi->movi_list+4, SEEK_SET);
1301 if (avi_sync(s, 1) == 0) {
1302 first_packet_pos = avio_tell(pb) - 8;
1304 avi->stream_index = -1;
1305 avio_seek(pb, idx1_pos, SEEK_SET);
1307 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")){
1308 first_packet_pos = 0;
1309 data_offset = avi->movi_list;
1312 /* Read the entries and sort them in each stream component. */
1313 for(i = 0; i < nb_index_entries; i++) {
1317 tag = avio_rl32(pb);
1318 flags = avio_rl32(pb);
1319 pos = avio_rl32(pb);
1320 len = avio_rl32(pb);
1321 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1322 i, tag, flags, pos, len);
1324 index = ((tag & 0xff) - '0') * 10;
1325 index += ((tag >> 8) & 0xff) - '0';
1326 if (index >= s->nb_streams)
1328 st = s->streams[index];
1329 ast = st->priv_data;
1331 if(first_packet && first_packet_pos && len) {
1332 data_offset = first_packet_pos - pos;
1337 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1339 // even if we have only a single stream, we should
1340 // switch to non-interleaved to get correct timestamps
1342 avi->non_interleaved= 1;
1343 if(last_idx != pos && len) {
1344 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1347 ast->cum_len += get_duration(ast, len);
1349 anykey |= flags&AVIIF_INDEX;
1352 for (index = 0; index < s->nb_streams; index++) {
1353 st = s->streams[index];
1354 if (st->nb_index_entries)
1355 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1361 static int guess_ni_flag(AVFormatContext *s){
1363 int64_t last_start=0;
1364 int64_t first_end= INT64_MAX;
1365 int64_t oldpos= avio_tell(s->pb);
1367 int64_t min_pos, pos;
1369 for(i=0; i<s->nb_streams; i++){
1370 AVStream *st = s->streams[i];
1371 int n= st->nb_index_entries;
1378 int64_t pos= st->index_entries[0].pos;
1379 avio_seek(s->pb, pos + 4, SEEK_SET);
1380 size= avio_rl32(s->pb);
1381 if(pos + size > st->index_entries[1].pos)
1382 last_start= INT64_MAX;
1385 if(st->index_entries[0].pos > last_start)
1386 last_start= st->index_entries[0].pos;
1387 if(st->index_entries[n-1].pos < first_end)
1388 first_end= st->index_entries[n-1].pos;
1390 avio_seek(s->pb, oldpos, SEEK_SET);
1391 if (last_start > first_end)
1393 idx= av_mallocz(sizeof(*idx) * s->nb_streams);
1394 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
1395 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
1396 min_pos = INT64_MAX;
1398 for (i=0; i<s->nb_streams; i++) {
1399 AVStream *st = s->streams[i];
1400 int n= st->nb_index_entries;
1401 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
1404 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q));
1405 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1408 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q));
1410 if(max_dts - min_dts > 2*AV_TIME_BASE) {
1419 static int avi_load_index(AVFormatContext *s)
1421 AVIContext *avi = s->priv_data;
1422 AVIOContext *pb = s->pb;
1424 int64_t pos= avio_tell(pb);
1428 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1429 goto the_end; // maybe truncated file
1430 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1432 tag = avio_rl32(pb);
1433 size = avio_rl32(pb);
1436 next = avio_tell(pb) + size + (size & 1);
1438 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1445 if (tag == MKTAG('i', 'd', 'x', '1') &&
1446 avi_read_idx1(s, size) >= 0) {
1447 avi->index_loaded=2;
1449 }else if(tag == MKTAG('L', 'I', 'S', 'T')) {
1450 uint32_t tag1 = avio_rl32(pb);
1452 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1453 ff_read_riff_info(s, size - 4);
1457 if (avio_seek(pb, next, SEEK_SET) < 0)
1458 break; // something is wrong here
1461 avio_seek(pb, pos, SEEK_SET);
1465 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1467 AVIStream *ast2 = st2->priv_data;
1468 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1469 av_free_packet(&ast2->sub_pkt);
1470 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1471 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1472 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1475 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1477 AVIContext *avi = s->priv_data;
1480 int64_t pos, pos_min;
1483 if (!avi->index_loaded) {
1484 /* we only load the index on demand */
1486 avi->index_loaded |= 1;
1488 av_assert0(stream_index>= 0);
1490 st = s->streams[stream_index];
1492 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1494 if (st->nb_index_entries > 0)
1495 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1496 timestamp * FFMAX(ast->sample_size, 1),
1497 st->index_entries[0].timestamp,
1498 st->index_entries[st->nb_index_entries - 1].timestamp);
1499 return AVERROR_INVALIDDATA;
1502 /* find the position */
1503 pos = st->index_entries[index].pos;
1504 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1506 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1507 timestamp, index, st->index_entries[index].timestamp);
1509 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1510 /* One and only one real stream for DV in AVI, and it has video */
1511 /* offsets. Calling with other stream indexes should have failed */
1512 /* the av_index_search_timestamp call above. */
1513 av_assert0(stream_index == 0);
1515 if(avio_seek(s->pb, pos, SEEK_SET) < 0)
1518 /* Feed the DV video stream version of the timestamp to the */
1519 /* DV demux so it can synthesize correct timestamps. */
1520 ff_dv_offset_reset(avi->dv_demux, timestamp);
1522 avi->stream_index= -1;
1527 for(i = 0; i < s->nb_streams; i++) {
1528 AVStream *st2 = s->streams[i];
1529 AVIStream *ast2 = st2->priv_data;
1534 if (ast2->sub_ctx) {
1535 seek_subtitle(st, st2, timestamp);
1539 if (st2->nb_index_entries <= 0)
1542 // av_assert1(st2->codec->block_align);
1543 av_assert0((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1544 index = av_index_search_timestamp(
1546 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1547 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1550 ast2->seek_pos= st2->index_entries[index].pos;
1551 pos_min= FFMIN(pos_min,ast2->seek_pos);
1553 for(i = 0; i < s->nb_streams; i++) {
1554 AVStream *st2 = s->streams[i];
1555 AVIStream *ast2 = st2->priv_data;
1557 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1560 index = av_index_search_timestamp(
1562 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1563 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1566 while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1568 ast2->frame_offset = st2->index_entries[index].timestamp;
1572 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1573 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1576 avi->stream_index= -1;
1577 avi->dts_max= INT_MIN;
1581 static int avi_read_close(AVFormatContext *s)
1584 AVIContext *avi = s->priv_data;
1586 for(i=0;i<s->nb_streams;i++) {
1587 AVStream *st = s->streams[i];
1588 AVIStream *ast = st->priv_data;
1591 av_freep(&ast->sub_ctx->pb);
1592 avformat_close_input(&ast->sub_ctx);
1594 av_free(ast->sub_buffer);
1595 av_free_packet(&ast->sub_pkt);
1599 av_free(avi->dv_demux);
1604 static int avi_probe(AVProbeData *p)
1608 /* check file header */
1609 for(i=0; avi_headers[i][0]; i++)
1610 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1611 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1612 return AVPROBE_SCORE_MAX;
1617 AVInputFormat ff_avi_demuxer = {
1619 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1620 .priv_data_size = sizeof(AVIContext),
1621 .read_probe = avi_probe,
1622 .read_header = avi_read_header,
1623 .read_packet = avi_read_packet,
1624 .read_close = avi_read_close,
1625 .read_seek = avi_read_seek,
1626 .priv_class = &demuxer_class,