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', 0x19))
86 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
88 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
94 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
95 AVIContext *avi = s->priv_data;
96 ByteIOContext *pb = &s->pb;
97 int longs_pre_entry= get_le16(pb);
98 int index_sub_type = get_byte(pb);
99 int index_type = get_byte(pb);
100 int entries_in_use = get_le32(pb);
101 int chunk_id = get_le32(pb);
102 int64_t base = get_le64(pb);
103 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
107 int64_t last_pos= -1;
108 int64_t filesize= url_fsize(&s->pb);
111 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
112 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
115 if(stream_id > s->nb_streams || stream_id < 0)
117 st= s->streams[stream_id];
125 if(index_type && longs_pre_entry != 2)
130 if(filesize > 0 && base >= filesize){
131 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
132 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
138 for(i=0; i<entries_in_use; i++){
140 int64_t pos= get_le32(pb) + base - 8;
141 int len = get_le32(pb);
146 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
148 if(last_pos == pos || pos == base - 8)
149 avi->non_interleaved= 1;
151 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
161 offset = get_le64(pb);
162 get_le32(pb); /* size */
163 duration = get_le32(pb);
166 url_fseek(pb, offset+8, SEEK_SET);
167 read_braindead_odml_indx(s, frame_num);
168 frame_num += duration;
170 url_fseek(pb, pos, SEEK_SET);
177 static void clean_index(AVFormatContext *s){
181 for(i=0; i<s->nb_streams; i++){
182 AVStream *st = s->streams[i];
183 AVIStream *ast = st->priv_data;
184 int n= st->nb_index_entries;
185 int max= ast->sample_size;
186 int64_t pos, size, ts;
188 if(n != 1 || ast->sample_size==0)
191 while(max < 1024) max+=max;
193 pos= st->index_entries[0].pos;
194 size= st->index_entries[0].size;
195 ts= st->index_entries[0].timestamp;
197 for(j=0; j<size; j+=max){
198 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
203 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
205 offset_t i = url_ftell(pb);
207 get_strz(pb, buf, maxlen);
208 url_fseek(pb, i+size, SEEK_SET);
212 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
214 AVIContext *avi = s->priv_data;
215 ByteIOContext *pb = &s->pb;
216 uint32_t tag, tag1, handler;
217 int codec_type, stream_index, frame_period, bit_rate;
218 unsigned int size, nb_frames;
221 AVIStream *ast = NULL;
224 avi->stream_index= -1;
226 if (get_riff(avi, pb) < 0)
239 print_tag("tag", tag, size);
243 case MKTAG('L', 'I', 'S', 'T'):
244 /* ignored, except when start of video packets */
247 print_tag("list", tag1, 0);
249 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
250 avi->movi_list = url_ftell(pb) - 4;
251 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
252 else avi->movi_end = url_fsize(pb);
254 printf("movi end=%"PRIx64"\n", avi->movi_end);
259 case MKTAG('d', 'm', 'l', 'h'):
261 url_fskip(pb, size + (size & 1));
263 case MKTAG('a', 'v', 'i', 'h'):
265 /* using frame_period is bad idea */
266 frame_period = get_le32(pb);
267 bit_rate = get_le32(pb) * 8;
269 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
271 url_fskip(pb, 2 * 4);
274 url_fskip(pb, size - 7 * 4);
276 case MKTAG('s', 't', 'r', 'h'):
280 handler = get_le32(pb); /* codec tag */
282 if(tag1 == MKTAG('p', 'a', 'd', 's')){
283 url_fskip(pb, size - 8);
287 st = av_new_stream(s, stream_index);
291 ast = av_mallocz(sizeof(AVIStream));
298 print_tag("strh", tag1, -1);
300 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
304 * After some consideration -- I don't think we
305 * have to support anything but DV in a type1 AVIs.
307 if (s->nb_streams != 1)
310 if (handler != MKTAG('d', 'v', 's', 'd') &&
311 handler != MKTAG('d', 'v', 'h', 'd') &&
312 handler != MKTAG('d', 'v', 's', 'l'))
315 ast = s->streams[0]->priv_data;
316 av_freep(&s->streams[0]->codec->extradata);
317 av_freep(&s->streams[0]);
319 if (ENABLE_DV_DEMUXER) {
320 avi->dv_demux = dv_init_demux(s);
324 s->streams[0]->priv_data = ast;
325 url_fskip(pb, 3 * 4);
326 ast->scale = get_le32(pb);
327 ast->rate = get_le32(pb);
328 url_fskip(pb, 4); /* start time */
330 dv_dur = get_le32(pb);
331 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
332 dv_dur *= AV_TIME_BASE;
333 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
336 * else, leave duration alone; timing estimation in utils.c
337 * will make a guess based on bit rate.
340 stream_index = s->nb_streams - 1;
341 url_fskip(pb, size - 9*4);
345 assert(stream_index < s->nb_streams);
346 st->codec->stream_codec_tag= handler;
348 get_le32(pb); /* flags */
349 get_le16(pb); /* priority */
350 get_le16(pb); /* language */
351 get_le32(pb); /* initial frame */
352 ast->scale = get_le32(pb);
353 ast->rate = get_le32(pb);
354 if(ast->scale && ast->rate){
355 }else if(frame_period){
357 ast->scale = frame_period;
362 av_set_pts_info(st, 64, ast->scale, ast->rate);
364 ast->cum_len=get_le32(pb); /* start */
365 nb_frames = get_le32(pb);
368 st->duration = nb_frames;
369 get_le32(pb); /* buffer size */
370 get_le32(pb); /* quality */
371 ast->sample_size = get_le32(pb); /* sample ssize */
372 ast->cum_len *= FFMAX(1, ast->sample_size);
373 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
376 case MKTAG('v', 'i', 'd', 's'):
377 codec_type = CODEC_TYPE_VIDEO;
379 ast->sample_size = 0;
381 case MKTAG('a', 'u', 'd', 's'):
382 codec_type = CODEC_TYPE_AUDIO;
384 case MKTAG('t', 'x', 't', 's'):
386 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
389 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
392 ast->frame_offset= ast->cum_len;
393 url_fskip(pb, size - 12 * 4);
395 case MKTAG('s', 't', 'r', 'f'):
397 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
400 st = s->streams[stream_index];
402 case CODEC_TYPE_VIDEO:
403 get_le32(pb); /* size */
404 st->codec->width = get_le32(pb);
405 st->codec->height = get_le32(pb);
406 get_le16(pb); /* panes */
407 st->codec->bits_per_sample= get_le16(pb); /* depth */
409 get_le32(pb); /* ImageSize */
410 get_le32(pb); /* XPelsPerMeter */
411 get_le32(pb); /* YPelsPerMeter */
412 get_le32(pb); /* ClrUsed */
413 get_le32(pb); /* ClrImportant */
415 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
416 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
417 st->codec->codec_tag = tag1;
418 st->codec->codec_id = CODEC_ID_XSUB;
422 if(size > 10*4 && size<(1<<30)){
423 st->codec->extradata_size= size - 10*4;
424 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
425 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
428 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
431 /* Extract palette from extradata if bpp <= 8 */
432 /* This code assumes that extradata contains only palette */
433 /* This is true for all paletted codecs implemented in ffmpeg */
434 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
435 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
436 #ifdef WORDS_BIGENDIAN
437 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
438 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
440 memcpy(st->codec->palctrl->palette, st->codec->extradata,
441 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
443 st->codec->palctrl->palette_changed = 1;
447 print_tag("video", tag1, 0);
449 st->codec->codec_type = CODEC_TYPE_VIDEO;
450 st->codec->codec_tag = tag1;
451 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
452 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
453 // url_fskip(pb, size - 5 * 4);
455 case CODEC_TYPE_AUDIO:
456 get_wav_header(pb, st->codec, size);
457 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
458 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
459 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
461 /* Force parsing as several audio frames can be in
462 * one packet and timestamps refer to packet start*/
463 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
464 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
465 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
466 st->need_parsing = AVSTREAM_PARSE_NONE;
467 /* AVI files with Xan DPCM audio (wrongly) declare PCM
468 * audio in the header but have Axan as stream_code_tag. */
469 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
470 st->codec->codec_id = CODEC_ID_XAN_DPCM;
471 st->codec->codec_tag = 0;
475 st->codec->codec_type = CODEC_TYPE_DATA;
476 st->codec->codec_id= CODEC_ID_NONE;
477 st->codec->codec_tag= 0;
483 case MKTAG('i', 'n', 'd', 'x'):
485 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
486 read_braindead_odml_indx(s, 0);
488 url_fseek(pb, i+size, SEEK_SET);
490 case MKTAG('I', 'N', 'A', 'M'):
491 avi_read_tag(pb, s->title, sizeof(s->title), size);
493 case MKTAG('I', 'A', 'R', 'T'):
494 avi_read_tag(pb, s->author, sizeof(s->author), size);
496 case MKTAG('I', 'C', 'O', 'P'):
497 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
499 case MKTAG('I', 'C', 'M', 'T'):
500 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
502 case MKTAG('I', 'G', 'N', 'R'):
503 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
505 case MKTAG('I', 'P', 'R', 'D'):
506 avi_read_tag(pb, s->album, sizeof(s->album), size);
508 case MKTAG('I', 'P', 'R', 'T'):
509 avi_read_tag(pb, str_track, sizeof(str_track), size);
510 sscanf(str_track, "%d", &s->track);
514 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
515 "ill ignore it and try to continue anyway\n");
516 avi->movi_list = url_ftell(pb) - 4;
517 avi->movi_end = url_fsize(pb);
527 /* check stream number */
528 if (stream_index != s->nb_streams - 1) {
530 for(i=0;i<s->nb_streams;i++) {
531 av_freep(&s->streams[i]->codec->extradata);
532 av_freep(&s->streams[i]);
537 if(!avi->index_loaded && !url_is_streamed(pb))
539 avi->index_loaded = 1;
540 avi->non_interleaved |= guess_ni_flag(s);
541 if(avi->non_interleaved)
547 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
549 AVIContext *avi = s->priv_data;
550 ByteIOContext *pb = &s->pb;
555 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
556 size = dv_get_packet(avi->dv_demux, pkt);
561 if(avi->non_interleaved){
562 int best_stream_index = 0;
563 AVStream *best_st= NULL;
565 int64_t best_ts= INT64_MAX;
568 for(i=0; i<s->nb_streams; i++){
569 AVStream *st = s->streams[i];
570 AVIStream *ast = st->priv_data;
571 int64_t ts= ast->frame_offset;
574 ts /= ast->sample_size;
575 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
577 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
581 best_stream_index= i;
584 best_ast = best_st->priv_data;
585 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
586 if(best_ast->remaining)
587 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
589 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
591 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
593 int64_t pos= best_st->index_entries[i].pos;
594 pos += best_ast->packet_size - best_ast->remaining;
595 url_fseek(&s->pb, pos + 8, SEEK_SET);
596 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
598 assert(best_ast->remaining <= best_ast->packet_size);
600 avi->stream_index= best_stream_index;
601 if(!best_ast->remaining)
602 best_ast->packet_size=
603 best_ast->remaining= best_st->index_entries[i].size;
608 if(avi->stream_index >= 0){
609 AVStream *st= s->streams[ avi->stream_index ];
610 AVIStream *ast= st->priv_data;
613 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
615 else if(ast->sample_size < 32)
616 size= 64*ast->sample_size;
618 size= ast->sample_size;
620 if(size > ast->remaining)
621 size= ast->remaining;
622 av_get_packet(pb, pkt, size);
624 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
625 dstr = pkt->destruct;
626 size = dv_produce_packet(avi->dv_demux, pkt,
627 pkt->data, pkt->size);
628 pkt->destruct = dstr;
629 pkt->flags |= PKT_FLAG_KEY;
631 /* XXX: how to handle B frames in avi ? */
632 pkt->dts = ast->frame_offset;
633 // pkt->dts += ast->start;
635 pkt->dts /= ast->sample_size;
636 //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);
637 pkt->stream_index = avi->stream_index;
639 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
642 assert(st->index_entries);
644 index= av_index_search_timestamp(st, pkt->dts, 0);
645 e= &st->index_entries[index];
647 if(index >= 0 && e->timestamp == ast->frame_offset){
648 if (e->flags & AVINDEX_KEYFRAME)
649 pkt->flags |= PKT_FLAG_KEY;
652 pkt->flags |= PKT_FLAG_KEY;
655 ast->frame_offset += pkt->size;
659 ast->remaining -= size;
661 avi->stream_index= -1;
668 memset(d, -1, sizeof(int)*8);
669 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
672 if (i >= avi->movi_end) {
674 url_fskip(pb, avi->riff_end - i);
675 avi->riff_end = avi->movi_end = url_fsize(pb);
684 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
686 if( d[2] >= '0' && d[2] <= '9'
687 && d[3] >= '0' && d[3] <= '9'){
688 n= (d[2] - '0') * 10 + (d[3] - '0');
690 n= 100; //invalid stream id
692 //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);
693 if(i + size > avi->movi_end || d[0]<0)
697 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
699 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
701 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
705 if( d[0] >= '0' && d[0] <= '9'
706 && d[1] >= '0' && d[1] <= '9'){
707 n= (d[0] - '0') * 10 + (d[1] - '0');
709 n= 100; //invalid stream id
713 if(n < s->nb_streams){
719 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
720 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
721 || st->discard >= AVDISCARD_ALL){
722 if(ast->sample_size) ast->frame_offset += pkt->size;
723 else ast->frame_offset++;
728 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
729 d[2]*256+d[3] == ast->prefix /*||
730 (d[2] == 'd' && d[3] == 'c') ||
731 (d[2] == 'w' && d[3] == 'b')*/) {
733 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
734 if(d[2]*256+d[3] == ast->prefix)
737 ast->prefix= d[2]*256+d[3];
738 ast->prefix_count= 0;
741 avi->stream_index= n;
742 ast->packet_size= size + 8;
743 ast->remaining= size;
746 uint64_t pos= url_ftell(pb) - 8;
747 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
748 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
754 /* palette changed chunk */
755 if ( d[0] >= '0' && d[0] <= '9'
756 && d[1] >= '0' && d[1] <= '9'
757 && ((d[2] == 'p' && d[3] == 'c'))
758 && n < s->nb_streams && i + size <= avi->movi_end) {
761 int first, clr, flags, k, p;
765 first = get_byte(pb);
767 if(!clr) /* all 256 colors used */
769 flags = get_le16(pb);
771 for (k = first; k < clr + first; k++) {
777 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
779 st->codec->palctrl->palette_changed = 1;
788 /* XXX: we make the implicit supposition that the position are sorted
790 static int avi_read_idx1(AVFormatContext *s, int size)
792 AVIContext *avi = s->priv_data;
793 ByteIOContext *pb = &s->pb;
794 int nb_index_entries, i;
797 unsigned int index, tag, flags, pos, len;
798 unsigned last_pos= -1;
800 nb_index_entries = size / 16;
801 if (nb_index_entries <= 0)
804 /* read the entries and sort them in each stream component */
805 for(i = 0; i < nb_index_entries; i++) {
807 flags = get_le32(pb);
810 #if defined(DEBUG_SEEK)
811 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
812 i, tag, flags, pos, len);
814 if(i==0 && pos > avi->movi_list)
815 avi->movi_list= 0; //FIXME better check
816 pos += avi->movi_list;
818 index = ((tag & 0xff) - '0') * 10;
819 index += ((tag >> 8) & 0xff) - '0';
820 if (index >= s->nb_streams)
822 st = s->streams[index];
825 #if defined(DEBUG_SEEK)
826 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
829 avi->non_interleaved= 1;
831 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
841 static int guess_ni_flag(AVFormatContext *s){
843 int64_t last_start=0;
844 int64_t first_end= INT64_MAX;
846 for(i=0; i<s->nb_streams; i++){
847 AVStream *st = s->streams[i];
848 int n= st->nb_index_entries;
853 if(st->index_entries[0].pos > last_start)
854 last_start= st->index_entries[0].pos;
855 if(st->index_entries[n-1].pos < first_end)
856 first_end= st->index_entries[n-1].pos;
858 return last_start > first_end;
861 static int avi_load_index(AVFormatContext *s)
863 AVIContext *avi = s->priv_data;
864 ByteIOContext *pb = &s->pb;
866 offset_t pos= url_ftell(pb);
868 url_fseek(pb, avi->movi_end, SEEK_SET);
870 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
878 printf("tag=%c%c%c%c size=0x%x\n",
886 case MKTAG('i', 'd', 'x', '1'):
887 if (avi_read_idx1(s, size) < 0)
900 url_fseek(pb, pos, SEEK_SET);
904 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
906 AVIContext *avi = s->priv_data;
911 if (!avi->index_loaded) {
912 /* we only load the index on demand */
914 avi->index_loaded = 1;
916 assert(stream_index>= 0);
918 st = s->streams[stream_index];
919 index= av_index_search_timestamp(st, timestamp, flags);
923 /* find the position */
924 pos = st->index_entries[index].pos;
925 timestamp = st->index_entries[index].timestamp;
927 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
929 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
930 /* One and only one real stream for DV in AVI, and it has video */
931 /* offsets. Calling with other stream indices should have failed */
932 /* the av_index_search_timestamp call above. */
933 assert(stream_index == 0);
935 /* Feed the DV video stream version of the timestamp to the */
936 /* DV demux so it can synth correct timestamps */
937 dv_offset_reset(avi->dv_demux, timestamp);
939 url_fseek(&s->pb, pos, SEEK_SET);
940 avi->stream_index= -1;
944 for(i = 0; i < s->nb_streams; i++) {
945 AVStream *st2 = s->streams[i];
946 AVIStream *ast2 = st2->priv_data;
951 if (st2->nb_index_entries <= 0)
954 // assert(st2->codec->block_align);
955 assert(st2->time_base.den == ast2->rate);
956 assert(st2->time_base.num == ast2->scale);
957 index = av_index_search_timestamp(
959 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
960 flags | AVSEEK_FLAG_BACKWARD);
964 if(!avi->non_interleaved){
965 while(index>0 && st2->index_entries[index].pos > pos)
967 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
971 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
972 /* extract the current frame number */
973 ast2->frame_offset = st2->index_entries[index].timestamp;
974 if(ast2->sample_size)
975 ast2->frame_offset *=ast2->sample_size;
979 url_fseek(&s->pb, pos, SEEK_SET);
980 avi->stream_index= -1;
984 static int avi_read_close(AVFormatContext *s)
987 AVIContext *avi = s->priv_data;
989 for(i=0;i<s->nb_streams;i++) {
990 AVStream *st = s->streams[i];
991 AVIStream *ast = st->priv_data;
993 av_free(st->codec->palctrl);
997 av_free(avi->dv_demux);
1002 static int avi_probe(AVProbeData *p)
1004 /* check file header */
1005 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
1006 p->buf[2] == 'F' && p->buf[3] == 'F' &&
1007 p->buf[8] == 'A' && p->buf[9] == 'V' &&
1008 p->buf[10] == 'I' && (p->buf[11] == ' ' || p->buf[11] == 0x19))
1009 return AVPROBE_SCORE_MAX;
1014 AVInputFormat avi_demuxer = {