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
32 typedef struct AVIStream {
33 int64_t frame_offset; /* current frame (video) or byte (audio) counter
34 (used to compute the pts) */
40 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
42 int64_t cum_len; /* temporary storage (used during seek) */
44 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
56 DVDemuxContext* dv_demux;
59 static int avi_load_index(AVFormatContext *s);
60 static int guess_ni_flag(AVFormatContext *s);
63 static void print_tag(const char *str, unsigned int tag, int size)
65 printf("%s: tag=%c%c%c%c size=0x%x\n",
74 static int get_riff(AVIContext *avi, ByteIOContext *pb)
77 /* check RIFF header */
80 if (tag != MKTAG('R', 'I', 'F', 'F'))
82 avi->riff_end = get_le32(pb); /* RIFF chunk size */
83 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
85 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
91 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
92 AVIContext *avi = s->priv_data;
93 ByteIOContext *pb = &s->pb;
94 int longs_pre_entry= get_le16(pb);
95 int index_sub_type = get_byte(pb);
96 int index_type = get_byte(pb);
97 int entries_in_use = get_le32(pb);
98 int chunk_id = get_le32(pb);
99 int64_t base = get_le64(pb);
100 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
104 int64_t last_pos= -1;
105 int64_t filesize= url_fsize(&s->pb);
108 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
109 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
112 if(stream_id > s->nb_streams || stream_id < 0)
114 st= s->streams[stream_id];
122 if(index_type && longs_pre_entry != 2)
127 if(filesize > 0 && base >= filesize){
128 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
129 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
135 for(i=0; i<entries_in_use; i++){
137 int64_t pos= get_le32(pb) + base - 8;
138 int len = get_le32(pb);
143 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
145 if(last_pos == pos || pos == base - 8)
146 avi->non_interleaved= 1;
148 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
158 offset = get_le64(pb);
159 get_le32(pb); /* size */
160 duration = get_le32(pb);
163 url_fseek(pb, offset+8, SEEK_SET);
164 read_braindead_odml_indx(s, frame_num);
165 frame_num += duration;
167 url_fseek(pb, pos, SEEK_SET);
174 static void clean_index(AVFormatContext *s){
178 for(i=0; i<s->nb_streams; i++){
179 AVStream *st = s->streams[i];
180 AVIStream *ast = st->priv_data;
181 int n= st->nb_index_entries;
182 int max= ast->sample_size;
183 int64_t pos, size, ts;
185 if(n != 1 || ast->sample_size==0)
188 while(max < 1024) max+=max;
190 pos= st->index_entries[0].pos;
191 size= st->index_entries[0].size;
192 ts= st->index_entries[0].timestamp;
194 for(j=0; j<size; j+=max){
195 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
200 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
202 offset_t i = url_ftell(pb);
204 get_strz(pb, buf, maxlen);
205 url_fseek(pb, i+size, SEEK_SET);
209 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
211 AVIContext *avi = s->priv_data;
212 ByteIOContext *pb = &s->pb;
213 uint32_t tag, tag1, handler;
214 int codec_type, stream_index, frame_period, bit_rate;
215 unsigned int size, nb_frames;
218 AVIStream *ast = NULL;
221 avi->stream_index= -1;
223 if (get_riff(avi, pb) < 0)
236 print_tag("tag", tag, size);
240 case MKTAG('L', 'I', 'S', 'T'):
241 /* ignored, except when start of video packets */
244 print_tag("list", tag1, 0);
246 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
247 avi->movi_list = url_ftell(pb) - 4;
248 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
249 else avi->movi_end = url_fsize(pb);
251 printf("movi end=%"PRIx64"\n", avi->movi_end);
256 case MKTAG('d', 'm', 'l', 'h'):
258 url_fskip(pb, size + (size & 1));
260 case MKTAG('a', 'v', 'i', 'h'):
262 /* using frame_period is bad idea */
263 frame_period = get_le32(pb);
264 bit_rate = get_le32(pb) * 8;
266 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
268 url_fskip(pb, 2 * 4);
272 st = av_new_stream(s, i);
276 ast = av_mallocz(sizeof(AVIStream));
281 url_fskip(pb, size - 7 * 4);
283 case MKTAG('s', 't', 'r', 'h'):
287 handler = get_le32(pb); /* codec tag */
289 print_tag("strh", tag1, -1);
291 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
293 * After some consideration -- I don't think we
294 * have to support anything but DV in a type1 AVIs.
296 if (s->nb_streams != 1)
299 if (handler != MKTAG('d', 'v', 's', 'd') &&
300 handler != MKTAG('d', 'v', 'h', 'd') &&
301 handler != MKTAG('d', 'v', 's', 'l'))
304 ast = s->streams[0]->priv_data;
305 av_freep(&s->streams[0]->codec->extradata);
306 av_freep(&s->streams[0]);
308 if (ENABLE_DV_DEMUXER) {
309 avi->dv_demux = dv_init_demux(s);
313 s->streams[0]->priv_data = ast;
314 url_fskip(pb, 3 * 4);
315 ast->scale = get_le32(pb);
316 ast->rate = get_le32(pb);
317 stream_index = s->nb_streams - 1;
318 url_fskip(pb, size - 7*4);
322 if (stream_index >= s->nb_streams) {
323 url_fskip(pb, size - 8);
324 /* ignore padding stream */
325 if (tag1 == MKTAG('p', 'a', 'd', 's'))
329 st = s->streams[stream_index];
331 st->codec->stream_codec_tag= handler;
333 get_le32(pb); /* flags */
334 get_le16(pb); /* priority */
335 get_le16(pb); /* language */
336 get_le32(pb); /* initial frame */
337 ast->scale = get_le32(pb);
338 ast->rate = get_le32(pb);
339 if(ast->scale && ast->rate){
340 }else if(frame_period){
342 ast->scale = frame_period;
347 av_set_pts_info(st, 64, ast->scale, ast->rate);
349 ast->cum_len=get_le32(pb); /* start */
350 nb_frames = get_le32(pb);
353 st->duration = nb_frames;
354 get_le32(pb); /* buffer size */
355 get_le32(pb); /* quality */
356 ast->sample_size = get_le32(pb); /* sample ssize */
357 ast->cum_len *= FFMAX(1, ast->sample_size);
358 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
361 case MKTAG('v', 'i', 'd', 's'):
362 codec_type = CODEC_TYPE_VIDEO;
364 ast->sample_size = 0;
366 case MKTAG('a', 'u', 'd', 's'):
367 codec_type = CODEC_TYPE_AUDIO;
369 case MKTAG('t', 'x', 't', 's'):
371 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
373 case MKTAG('p', 'a', 'd', 's'):
374 codec_type = CODEC_TYPE_UNKNOWN;
378 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
381 ast->frame_offset= ast->cum_len;
382 url_fskip(pb, size - 12 * 4);
384 case MKTAG('s', 't', 'r', 'f'):
386 if (stream_index >= s->nb_streams || avi->dv_demux) {
389 st = s->streams[stream_index];
391 case CODEC_TYPE_VIDEO:
392 get_le32(pb); /* size */
393 st->codec->width = get_le32(pb);
394 st->codec->height = get_le32(pb);
395 get_le16(pb); /* panes */
396 st->codec->bits_per_sample= get_le16(pb); /* depth */
398 get_le32(pb); /* ImageSize */
399 get_le32(pb); /* XPelsPerMeter */
400 get_le32(pb); /* YPelsPerMeter */
401 get_le32(pb); /* ClrUsed */
402 get_le32(pb); /* ClrImportant */
404 if(size > 10*4 && size<(1<<30)){
405 st->codec->extradata_size= size - 10*4;
406 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
407 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
410 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
413 /* Extract palette from extradata if bpp <= 8 */
414 /* This code assumes that extradata contains only palette */
415 /* This is true for all paletted codecs implemented in ffmpeg */
416 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
417 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
418 #ifdef WORDS_BIGENDIAN
419 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
420 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
422 memcpy(st->codec->palctrl->palette, st->codec->extradata,
423 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
425 st->codec->palctrl->palette_changed = 1;
429 print_tag("video", tag1, 0);
431 st->codec->codec_type = CODEC_TYPE_VIDEO;
432 st->codec->codec_tag = tag1;
433 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
434 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
435 // url_fskip(pb, size - 5 * 4);
437 case CODEC_TYPE_AUDIO:
438 get_wav_header(pb, st->codec, size);
439 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
440 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
441 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
443 st->need_parsing = 1;
444 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
445 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
446 st->need_parsing = 0;
447 /* force parsing as several audio frames can be in
449 /* AVI files with Xan DPCM audio (wrongly) declare PCM
450 * audio in the header but have Axan as stream_code_tag. */
451 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
452 st->codec->codec_id = CODEC_ID_XAN_DPCM;
453 st->codec->codec_tag = 0;
457 st->codec->codec_type = CODEC_TYPE_DATA;
458 st->codec->codec_id= CODEC_ID_NONE;
459 st->codec->codec_tag= 0;
465 case MKTAG('i', 'n', 'd', 'x'):
467 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
468 read_braindead_odml_indx(s, 0);
470 url_fseek(pb, i+size, SEEK_SET);
472 case MKTAG('I', 'N', 'A', 'M'):
473 avi_read_tag(pb, s->title, sizeof(s->title), size);
475 case MKTAG('I', 'A', 'R', 'T'):
476 avi_read_tag(pb, s->author, sizeof(s->author), size);
478 case MKTAG('I', 'C', 'O', 'P'):
479 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
481 case MKTAG('I', 'C', 'M', 'T'):
482 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
484 case MKTAG('I', 'G', 'N', 'R'):
485 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
487 case MKTAG('I', 'P', 'R', 'D'):
488 avi_read_tag(pb, s->album, sizeof(s->album), size);
490 case MKTAG('I', 'P', 'R', 'T'):
491 avi_read_tag(pb, str_track, sizeof(str_track), size);
492 sscanf(str_track, "%d", &s->track);
502 /* check stream number */
503 if (stream_index != s->nb_streams - 1) {
505 for(i=0;i<s->nb_streams;i++) {
506 av_freep(&s->streams[i]->codec->extradata);
507 av_freep(&s->streams[i]);
512 if(!avi->index_loaded && !url_is_streamed(pb))
514 avi->index_loaded = 1;
515 avi->non_interleaved |= guess_ni_flag(s);
516 if(avi->non_interleaved)
522 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
524 AVIContext *avi = s->priv_data;
525 ByteIOContext *pb = &s->pb;
530 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
531 size = dv_get_packet(avi->dv_demux, pkt);
536 if(avi->non_interleaved){
537 int best_stream_index = 0;
538 AVStream *best_st= NULL;
540 int64_t best_ts= INT64_MAX;
543 for(i=0; i<s->nb_streams; i++){
544 AVStream *st = s->streams[i];
545 AVIStream *ast = st->priv_data;
546 int64_t ts= ast->frame_offset;
549 ts /= ast->sample_size;
550 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
552 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
556 best_stream_index= i;
559 best_ast = best_st->priv_data;
560 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
561 if(best_ast->remaining)
562 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
564 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
566 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
568 int64_t pos= best_st->index_entries[i].pos;
569 pos += best_ast->packet_size - best_ast->remaining;
570 url_fseek(&s->pb, pos + 8, SEEK_SET);
571 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
573 assert(best_ast->remaining <= best_ast->packet_size);
575 avi->stream_index= best_stream_index;
576 if(!best_ast->remaining)
577 best_ast->packet_size=
578 best_ast->remaining= best_st->index_entries[i].size;
583 if(avi->stream_index >= 0){
584 AVStream *st= s->streams[ avi->stream_index ];
585 AVIStream *ast= st->priv_data;
588 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
590 else if(ast->sample_size < 32)
591 size= 64*ast->sample_size;
593 size= ast->sample_size;
595 if(size > ast->remaining)
596 size= ast->remaining;
597 av_get_packet(pb, pkt, size);
599 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
600 dstr = pkt->destruct;
601 size = dv_produce_packet(avi->dv_demux, pkt,
602 pkt->data, pkt->size);
603 pkt->destruct = dstr;
604 pkt->flags |= PKT_FLAG_KEY;
606 /* XXX: how to handle B frames in avi ? */
607 pkt->dts = ast->frame_offset;
608 // pkt->dts += ast->start;
610 pkt->dts /= ast->sample_size;
611 //av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %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);
612 pkt->stream_index = avi->stream_index;
614 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
615 if(st->index_entries){
619 index= av_index_search_timestamp(st, pkt->dts, 0);
620 e= &st->index_entries[index];
622 if(index >= 0 && e->timestamp == ast->frame_offset){
623 if (e->flags & AVINDEX_KEYFRAME)
624 pkt->flags |= PKT_FLAG_KEY;
627 /* if no index, better to say that all frames
629 pkt->flags |= PKT_FLAG_KEY;
632 pkt->flags |= PKT_FLAG_KEY;
635 ast->frame_offset += pkt->size;
639 ast->remaining -= size;
641 avi->stream_index= -1;
652 memset(d, -1, sizeof(int)*8);
653 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
656 if (i >= avi->movi_end) {
658 url_fskip(pb, avi->riff_end - i);
659 avi->riff_end = avi->movi_end = url_fsize(pb);
668 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
670 if( d[2] >= '0' && d[2] <= '9'
671 && d[3] >= '0' && d[3] <= '9'){
672 n= (d[2] - '0') * 10 + (d[3] - '0');
674 n= 100; //invalid stream id
676 //av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
677 if(i + size > avi->movi_end || d[0]<0)
681 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
683 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
685 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
689 if( d[0] >= '0' && d[0] <= '9'
690 && d[1] >= '0' && d[1] <= '9'){
691 n= (d[0] - '0') * 10 + (d[1] - '0');
693 n= 100; //invalid stream id
697 if(n < s->nb_streams){
703 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
704 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
705 || st->discard >= AVDISCARD_ALL){
706 if(ast->sample_size) ast->frame_offset += pkt->size;
707 else ast->frame_offset++;
712 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
713 d[2]*256+d[3] == ast->prefix /*||
714 (d[2] == 'd' && d[3] == 'c') ||
715 (d[2] == 'w' && d[3] == 'b')*/) {
717 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
718 if(d[2]*256+d[3] == ast->prefix)
721 ast->prefix= d[2]*256+d[3];
722 ast->prefix_count= 0;
725 avi->stream_index= n;
726 ast->packet_size= size + 8;
727 ast->remaining= size;
731 /* palette changed chunk */
732 if ( d[0] >= '0' && d[0] <= '9'
733 && d[1] >= '0' && d[1] <= '9'
734 && ((d[2] == 'p' && d[3] == 'c'))
735 && n < s->nb_streams && i + size <= avi->movi_end) {
738 int first, clr, flags, k, p;
742 first = get_byte(pb);
744 if(!clr) /* all 256 colors used */
746 flags = get_le16(pb);
748 for (k = first; k < clr + first; k++) {
754 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
756 st->codec->palctrl->palette_changed = 1;
765 /* XXX: we make the implicit supposition that the position are sorted
767 static int avi_read_idx1(AVFormatContext *s, int size)
769 AVIContext *avi = s->priv_data;
770 ByteIOContext *pb = &s->pb;
771 int nb_index_entries, i;
774 unsigned int index, tag, flags, pos, len;
775 unsigned last_pos= -1;
777 nb_index_entries = size / 16;
778 if (nb_index_entries <= 0)
781 /* read the entries and sort them in each stream component */
782 for(i = 0; i < nb_index_entries; i++) {
784 flags = get_le32(pb);
787 #if defined(DEBUG_SEEK)
788 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
789 i, tag, flags, pos, len);
791 if(i==0 && pos > avi->movi_list)
792 avi->movi_list= 0; //FIXME better check
793 pos += avi->movi_list;
795 index = ((tag & 0xff) - '0') * 10;
796 index += ((tag >> 8) & 0xff) - '0';
797 if (index >= s->nb_streams)
799 st = s->streams[index];
802 #if defined(DEBUG_SEEK)
803 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
806 avi->non_interleaved= 1;
808 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
818 static int guess_ni_flag(AVFormatContext *s){
820 int64_t last_start=0;
821 int64_t first_end= INT64_MAX;
823 for(i=0; i<s->nb_streams; i++){
824 AVStream *st = s->streams[i];
825 int n= st->nb_index_entries;
830 if(st->index_entries[0].pos > last_start)
831 last_start= st->index_entries[0].pos;
832 if(st->index_entries[n-1].pos < first_end)
833 first_end= st->index_entries[n-1].pos;
835 return last_start > first_end;
838 static int avi_load_index(AVFormatContext *s)
840 AVIContext *avi = s->priv_data;
841 ByteIOContext *pb = &s->pb;
843 offset_t pos= url_ftell(pb);
845 url_fseek(pb, avi->movi_end, SEEK_SET);
847 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
855 printf("tag=%c%c%c%c size=0x%x\n",
863 case MKTAG('i', 'd', 'x', '1'):
864 if (avi_read_idx1(s, size) < 0)
877 url_fseek(pb, pos, SEEK_SET);
881 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
883 AVIContext *avi = s->priv_data;
888 if (!avi->index_loaded) {
889 /* we only load the index on demand */
891 avi->index_loaded = 1;
893 assert(stream_index>= 0);
895 st = s->streams[stream_index];
896 index= av_index_search_timestamp(st, timestamp, flags);
900 /* find the position */
901 pos = st->index_entries[index].pos;
902 timestamp = st->index_entries[index].timestamp;
904 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
906 for(i = 0; i < s->nb_streams; i++) {
907 AVStream *st2 = s->streams[i];
908 AVIStream *ast2 = st2->priv_data;
913 if (st2->nb_index_entries <= 0)
916 // assert(st2->codec->block_align);
917 assert(st2->time_base.den == ast2->rate);
918 assert(st2->time_base.num == ast2->scale);
919 index = av_index_search_timestamp(
921 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
922 flags | AVSEEK_FLAG_BACKWARD);
926 if(!avi->non_interleaved){
927 while(index>0 && st2->index_entries[index].pos > pos)
929 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
933 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
934 /* extract the current frame number */
935 ast2->frame_offset = st2->index_entries[index].timestamp;
936 if(ast2->sample_size)
937 ast2->frame_offset *=ast2->sample_size;
940 if (ENABLE_DV_DEMUXER && avi->dv_demux)
941 dv_flush_audio_packets(avi->dv_demux);
943 url_fseek(&s->pb, pos, SEEK_SET);
944 avi->stream_index= -1;
948 static int avi_read_close(AVFormatContext *s)
951 AVIContext *avi = s->priv_data;
953 for(i=0;i<s->nb_streams;i++) {
954 AVStream *st = s->streams[i];
955 AVIStream *ast = st->priv_data;
957 av_free(st->codec->palctrl);
961 av_free(avi->dv_demux);
966 static int avi_probe(AVProbeData *p)
968 /* check file header */
969 if (p->buf_size <= 32)
971 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
972 p->buf[2] == 'F' && p->buf[3] == 'F' &&
973 p->buf[8] == 'A' && p->buf[9] == 'V' &&
974 p->buf[10] == 'I' && p->buf[11] == ' ')
975 return AVPROBE_SCORE_MAX;
980 AVInputFormat avi_demuxer = {