3 * Copyright (c) 2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 typedef struct AVIStream {
31 int64_t frame_offset; /* current frame (video) or byte (audio) counter
32 (used to compute the pts) */
38 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
40 int64_t cum_len; /* temporary storage (used during seek) */
42 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
54 DVDemuxContext* dv_demux;
57 static int avi_load_index(AVFormatContext *s);
58 static int guess_ni_flag(AVFormatContext *s);
61 static void print_tag(const char *str, unsigned int tag, int size)
63 printf("%s: tag=%c%c%c%c size=0x%x\n",
72 static int get_riff(AVIContext *avi, ByteIOContext *pb)
75 /* check RIFF header */
78 if (tag != MKTAG('R', 'I', 'F', 'F'))
80 avi->riff_end = get_le32(pb); /* RIFF chunk size */
81 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
83 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
89 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
90 AVIContext *avi = s->priv_data;
91 ByteIOContext *pb = &s->pb;
92 int longs_pre_entry= get_le16(pb);
93 int index_sub_type = get_byte(pb);
94 int index_type = get_byte(pb);
95 int entries_in_use = get_le32(pb);
96 int chunk_id = get_le32(pb);
97 int64_t base = get_le64(pb);
98 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
102 int64_t last_pos= -1;
103 int64_t filesize= url_fsize(&s->pb);
106 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16LX\n",
107 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
110 if(stream_id > s->nb_streams || stream_id < 0)
112 st= s->streams[stream_id];
120 if(index_type && longs_pre_entry != 2)
125 if(filesize > 0 && base >= filesize){
126 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
127 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
133 for(i=0; i<entries_in_use; i++){
135 int64_t pos= get_le32(pb) + base - 8;
136 int len = get_le32(pb);
141 av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
143 if(last_pos == pos || pos == base - 8)
144 avi->non_interleaved= 1;
146 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
149 ast->cum_len += len / ast->sample_size;
156 offset = get_le64(pb);
157 get_le32(pb); /* size */
158 duration = get_le32(pb);
161 url_fseek(pb, offset+8, SEEK_SET);
162 read_braindead_odml_indx(s, frame_num);
163 frame_num += duration;
165 url_fseek(pb, pos, SEEK_SET);
172 static void clean_index(AVFormatContext *s){
176 for(i=0; i<s->nb_streams; i++){
177 AVStream *st = s->streams[i];
178 AVIStream *ast = st->priv_data;
179 int n= st->nb_index_entries;
180 int max= ast->sample_size;
181 int64_t pos, size, ts;
183 if(n != 1 || ast->sample_size==0)
186 while(max < 1024) max+=max;
188 pos= st->index_entries[0].pos;
189 size= st->index_entries[0].size;
190 ts= st->index_entries[0].timestamp;
192 for(j=0; j<size; j+=max){
193 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
198 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
200 offset_t i = url_ftell(pb);
202 get_strz(pb, buf, maxlen);
203 url_fseek(pb, i+size, SEEK_SET);
207 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
209 AVIContext *avi = s->priv_data;
210 ByteIOContext *pb = &s->pb;
211 uint32_t tag, tag1, handler;
212 int codec_type, stream_index, frame_period, bit_rate;
213 unsigned int size, nb_frames;
216 AVIStream *ast = NULL;
217 int xan_video = 0; /* hack to support Xan A/V */
219 avi->stream_index= -1;
221 if (get_riff(avi, pb) < 0)
234 print_tag("tag", tag, size);
238 case MKTAG('L', 'I', 'S', 'T'):
239 /* ignored, except when start of video packets */
242 print_tag("list", tag1, 0);
244 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
245 avi->movi_list = url_ftell(pb) - 4;
246 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
247 else avi->movi_end = url_fsize(pb);
249 printf("movi end=%Lx\n", avi->movi_end);
254 case MKTAG('d', 'm', 'l', 'h'):
256 url_fskip(pb, size + (size & 1));
258 case MKTAG('a', 'v', 'i', 'h'):
260 /* using frame_period is bad idea */
261 frame_period = get_le32(pb);
262 bit_rate = get_le32(pb) * 8;
264 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
266 url_fskip(pb, 2 * 4);
270 st = av_new_stream(s, i);
274 ast = av_mallocz(sizeof(AVIStream));
279 url_fskip(pb, size - 7 * 4);
281 case MKTAG('s', 't', 'r', 'h'):
285 handler = get_le32(pb); /* codec tag */
287 print_tag("strh", tag1, -1);
289 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
291 * After some consideration -- I don't think we
292 * have to support anything but DV in a type1 AVIs.
294 if (s->nb_streams != 1)
297 if (handler != MKTAG('d', 'v', 's', 'd') &&
298 handler != MKTAG('d', 'v', 'h', 'd') &&
299 handler != MKTAG('d', 'v', 's', 'l'))
302 ast = s->streams[0]->priv_data;
303 av_freep(&s->streams[0]->codec->extradata);
304 av_freep(&s->streams[0]);
306 avi->dv_demux = dv_init_demux(s);
309 s->streams[0]->priv_data = ast;
310 url_fskip(pb, 3 * 4);
311 ast->scale = get_le32(pb);
312 ast->rate = get_le32(pb);
313 stream_index = s->nb_streams - 1;
314 url_fskip(pb, size - 7*4);
318 if (stream_index >= s->nb_streams) {
319 url_fskip(pb, size - 8);
320 /* ignore padding stream */
321 if (tag1 == MKTAG('p', 'a', 'd', 's'))
325 st = s->streams[stream_index];
327 st->codec->stream_codec_tag= handler;
329 get_le32(pb); /* flags */
330 get_le16(pb); /* priority */
331 get_le16(pb); /* language */
332 get_le32(pb); /* initial frame */
333 ast->scale = get_le32(pb);
334 ast->rate = get_le32(pb);
335 if(ast->scale && ast->rate){
336 }else if(frame_period){
338 ast->scale = frame_period;
343 av_set_pts_info(st, 64, ast->scale, ast->rate);
345 ast->cum_len=get_le32(pb); /* start */
346 nb_frames = get_le32(pb);
349 st->duration = nb_frames;
350 get_le32(pb); /* buffer size */
351 get_le32(pb); /* quality */
352 ast->sample_size = get_le32(pb); /* sample ssize */
353 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
356 case MKTAG('v', 'i', 'd', 's'):
357 codec_type = CODEC_TYPE_VIDEO;
359 ast->sample_size = 0;
361 case MKTAG('a', 'u', 'd', 's'):
362 codec_type = CODEC_TYPE_AUDIO;
364 case MKTAG('t', 'x', 't', 's'):
366 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
368 case MKTAG('p', 'a', 'd', 's'):
369 codec_type = CODEC_TYPE_UNKNOWN;
373 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
376 ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1);
377 url_fskip(pb, size - 12 * 4);
379 case MKTAG('s', 't', 'r', 'f'):
381 if (stream_index >= s->nb_streams || avi->dv_demux) {
384 st = s->streams[stream_index];
386 case CODEC_TYPE_VIDEO:
387 get_le32(pb); /* size */
388 st->codec->width = get_le32(pb);
389 st->codec->height = get_le32(pb);
390 get_le16(pb); /* panes */
391 st->codec->bits_per_sample= get_le16(pb); /* depth */
393 get_le32(pb); /* ImageSize */
394 get_le32(pb); /* XPelsPerMeter */
395 get_le32(pb); /* YPelsPerMeter */
396 get_le32(pb); /* ClrUsed */
397 get_le32(pb); /* ClrImportant */
399 if(size > 10*4 && size<(1<<30)){
400 st->codec->extradata_size= size - 10*4;
401 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
402 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
405 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
408 /* Extract palette from extradata if bpp <= 8 */
409 /* This code assumes that extradata contains only palette */
410 /* This is true for all paletted codecs implemented in ffmpeg */
411 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
412 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
413 #ifdef WORDS_BIGENDIAN
414 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
415 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
417 memcpy(st->codec->palctrl->palette, st->codec->extradata,
418 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
420 st->codec->palctrl->palette_changed = 1;
424 print_tag("video", tag1, 0);
426 st->codec->codec_type = CODEC_TYPE_VIDEO;
427 st->codec->codec_tag = tag1;
428 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
429 if (st->codec->codec_id == CODEC_ID_XAN_WC4)
431 st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts
432 // url_fskip(pb, size - 5 * 4);
434 case CODEC_TYPE_AUDIO:
435 get_wav_header(pb, st->codec, size);
436 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
437 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
438 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
440 /* special case time: To support Xan DPCM, hardcode
441 * the format if Xxan is the video codec */
442 st->need_parsing = 1;
443 /* force parsing as several audio frames can be in
446 st->codec->codec_id = CODEC_ID_XAN_DPCM;
449 st->codec->codec_type = CODEC_TYPE_DATA;
450 st->codec->codec_id= CODEC_ID_NONE;
451 st->codec->codec_tag= 0;
457 case MKTAG('i', 'n', 'd', 'x'):
459 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
460 read_braindead_odml_indx(s, 0);
462 url_fseek(pb, i+size, SEEK_SET);
464 case MKTAG('I', 'N', 'A', 'M'):
465 avi_read_tag(pb, s->title, sizeof(s->title), size);
467 case MKTAG('I', 'A', 'R', 'T'):
468 avi_read_tag(pb, s->author, sizeof(s->author), size);
470 case MKTAG('I', 'C', 'O', 'P'):
471 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
473 case MKTAG('I', 'C', 'M', 'T'):
474 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
476 case MKTAG('I', 'G', 'N', 'R'):
477 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
479 case MKTAG('I', 'P', 'R', 'D'):
480 avi_read_tag(pb, s->album, sizeof(s->album), size);
490 /* check stream number */
491 if (stream_index != s->nb_streams - 1) {
493 for(i=0;i<s->nb_streams;i++) {
494 av_freep(&s->streams[i]->codec->extradata);
495 av_freep(&s->streams[i]);
500 if(!avi->index_loaded && !url_is_streamed(pb))
502 avi->index_loaded = 1;
503 avi->non_interleaved |= guess_ni_flag(s);
504 if(avi->non_interleaved)
510 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
512 AVIContext *avi = s->priv_data;
513 ByteIOContext *pb = &s->pb;
519 size = dv_get_packet(avi->dv_demux, pkt);
524 if(avi->non_interleaved){
525 int best_stream_index = 0;
526 AVStream *best_st= NULL;
528 int64_t best_ts= INT64_MAX;
531 for(i=0; i<s->nb_streams; i++){
532 AVStream *st = s->streams[i];
533 AVIStream *ast = st->priv_data;
534 int64_t ts= ast->frame_offset;
537 ts /= ast->sample_size;
538 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
540 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
544 best_stream_index= i;
547 best_ast = best_st->priv_data;
548 best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
549 if(best_ast->remaining)
550 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
552 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
554 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
556 int64_t pos= best_st->index_entries[i].pos;
557 pos += best_ast->packet_size - best_ast->remaining;
558 url_fseek(&s->pb, pos + 8, SEEK_SET);
559 // av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
561 assert(best_ast->remaining <= best_ast->packet_size);
563 avi->stream_index= best_stream_index;
564 if(!best_ast->remaining)
565 best_ast->packet_size=
566 best_ast->remaining= best_st->index_entries[i].size;
571 if(avi->stream_index >= 0){
572 AVStream *st= s->streams[ avi->stream_index ];
573 AVIStream *ast= st->priv_data;
576 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
578 else if(ast->sample_size < 32)
579 size= 64*ast->sample_size;
581 size= ast->sample_size;
583 if(size > ast->remaining)
584 size= ast->remaining;
585 av_get_packet(pb, pkt, size);
588 dstr = pkt->destruct;
589 size = dv_produce_packet(avi->dv_demux, pkt,
590 pkt->data, pkt->size);
591 pkt->destruct = dstr;
592 pkt->flags |= PKT_FLAG_KEY;
594 /* XXX: how to handle B frames in avi ? */
595 pkt->dts = ast->frame_offset;
596 // pkt->dts += ast->start;
598 pkt->dts /= ast->sample_size;
599 //av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%Ld %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
600 pkt->stream_index = avi->stream_index;
602 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
603 if(st->index_entries){
607 index= av_index_search_timestamp(st, pkt->dts, 0);
608 e= &st->index_entries[index];
610 if(index >= 0 && e->timestamp == ast->frame_offset){
611 if (e->flags & AVINDEX_KEYFRAME)
612 pkt->flags |= PKT_FLAG_KEY;
615 /* if no index, better to say that all frames
617 pkt->flags |= PKT_FLAG_KEY;
620 pkt->flags |= PKT_FLAG_KEY;
623 ast->frame_offset += pkt->size;
627 ast->remaining -= size;
629 avi->stream_index= -1;
640 memset(d, -1, sizeof(int)*8);
641 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
644 if (i >= avi->movi_end) {
646 url_fskip(pb, avi->riff_end - i);
647 avi->riff_end = avi->movi_end = url_fsize(pb);
656 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
658 if( d[2] >= '0' && d[2] <= '9'
659 && d[3] >= '0' && d[3] <= '9'){
660 n= (d[2] - '0') * 10 + (d[3] - '0');
662 n= 100; //invalid stream id
664 //av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
665 if(i + size > avi->movi_end || d[0]<0)
669 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
671 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
673 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
677 if( d[0] >= '0' && d[0] <= '9'
678 && d[1] >= '0' && d[1] <= '9'){
679 n= (d[0] - '0') * 10 + (d[1] - '0');
681 n= 100; //invalid stream id
685 if(n < s->nb_streams){
691 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
692 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
693 || st->discard >= AVDISCARD_ALL){
694 if(ast->sample_size) ast->frame_offset += pkt->size;
695 else ast->frame_offset++;
700 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
701 d[2]*256+d[3] == ast->prefix /*||
702 (d[2] == 'd' && d[3] == 'c') ||
703 (d[2] == 'w' && d[3] == 'b')*/) {
705 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
706 if(d[2]*256+d[3] == ast->prefix)
709 ast->prefix= d[2]*256+d[3];
710 ast->prefix_count= 0;
713 avi->stream_index= n;
714 ast->packet_size= size + 8;
715 ast->remaining= size;
719 /* palette changed chunk */
720 if ( d[0] >= '0' && d[0] <= '9'
721 && d[1] >= '0' && d[1] <= '9'
722 && ((d[2] == 'p' && d[3] == 'c'))
723 && n < s->nb_streams && i + size <= avi->movi_end) {
726 int first, clr, flags, k, p;
730 first = get_byte(pb);
732 if(!clr) /* all 256 colors used */
734 flags = get_le16(pb);
736 for (k = first; k < clr + first; k++) {
742 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
744 st->codec->palctrl->palette_changed = 1;
753 /* XXX: we make the implicit supposition that the position are sorted
755 static int avi_read_idx1(AVFormatContext *s, int size)
757 AVIContext *avi = s->priv_data;
758 ByteIOContext *pb = &s->pb;
759 int nb_index_entries, i;
762 unsigned int index, tag, flags, pos, len;
763 unsigned last_pos= -1;
765 nb_index_entries = size / 16;
766 if (nb_index_entries <= 0)
769 /* read the entries and sort them in each stream component */
770 for(i = 0; i < nb_index_entries; i++) {
772 flags = get_le32(pb);
775 #if defined(DEBUG_SEEK)
776 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
777 i, tag, flags, pos, len);
779 if(i==0 && pos > avi->movi_list)
780 avi->movi_list= 0; //FIXME better check
781 pos += avi->movi_list;
783 index = ((tag & 0xff) - '0') * 10;
784 index += ((tag >> 8) & 0xff) - '0';
785 if (index >= s->nb_streams)
787 st = s->streams[index];
790 #if defined(DEBUG_SEEK)
791 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%Ld\n", len, ast->cum_len);
794 avi->non_interleaved= 1;
796 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
798 ast->cum_len += len / ast->sample_size;
806 static int guess_ni_flag(AVFormatContext *s){
808 int64_t last_start=0;
809 int64_t first_end= INT64_MAX;
811 for(i=0; i<s->nb_streams; i++){
812 AVStream *st = s->streams[i];
813 int n= st->nb_index_entries;
818 if(st->index_entries[0].pos > last_start)
819 last_start= st->index_entries[0].pos;
820 if(st->index_entries[n-1].pos < first_end)
821 first_end= st->index_entries[n-1].pos;
823 return last_start > first_end;
826 static int avi_load_index(AVFormatContext *s)
828 AVIContext *avi = s->priv_data;
829 ByteIOContext *pb = &s->pb;
831 offset_t pos= url_ftell(pb);
833 url_fseek(pb, avi->movi_end, SEEK_SET);
835 printf("movi_end=0x%llx\n", avi->movi_end);
843 printf("tag=%c%c%c%c size=0x%x\n",
851 case MKTAG('i', 'd', 'x', '1'):
852 if (avi_read_idx1(s, size) < 0)
865 url_fseek(pb, pos, SEEK_SET);
869 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
871 AVIContext *avi = s->priv_data;
876 if (!avi->index_loaded) {
877 /* we only load the index on demand */
879 avi->index_loaded = 1;
881 assert(stream_index>= 0);
883 st = s->streams[stream_index];
884 index= av_index_search_timestamp(st, timestamp, flags);
888 /* find the position */
889 pos = st->index_entries[index].pos;
890 timestamp = st->index_entries[index].timestamp;
892 // av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
894 for(i = 0; i < s->nb_streams; i++) {
895 AVStream *st2 = s->streams[i];
896 AVIStream *ast2 = st2->priv_data;
901 if (st2->nb_index_entries <= 0)
904 // assert(st2->codec->block_align);
905 assert(st2->time_base.den == ast2->rate);
906 assert(st2->time_base.num == ast2->scale);
907 index = av_index_search_timestamp(
909 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
910 flags | AVSEEK_FLAG_BACKWARD);
914 if(!avi->non_interleaved){
915 while(index>0 && st2->index_entries[index].pos > pos)
917 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
921 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
922 /* extract the current frame number */
923 ast2->frame_offset = st2->index_entries[index].timestamp;
924 if(ast2->sample_size)
925 ast2->frame_offset *=ast2->sample_size;
929 dv_flush_audio_packets(avi->dv_demux);
931 url_fseek(&s->pb, pos, SEEK_SET);
932 avi->stream_index= -1;
936 static int avi_read_close(AVFormatContext *s)
939 AVIContext *avi = s->priv_data;
941 for(i=0;i<s->nb_streams;i++) {
942 AVStream *st = s->streams[i];
943 AVIStream *ast = st->priv_data;
945 av_free(st->codec->palctrl);
949 av_free(avi->dv_demux);
954 static int avi_probe(AVProbeData *p)
956 /* check file header */
957 if (p->buf_size <= 32)
959 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
960 p->buf[2] == 'F' && p->buf[3] == 'F' &&
961 p->buf[8] == 'A' && p->buf[9] == 'V' &&
962 p->buf[10] == 'I' && p->buf[11] == ' ')
963 return AVPROBE_SCORE_MAX;
968 AVInputFormat avi_demuxer = {