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'
57 DVDemuxContext* dv_demux;
60 static int avi_load_index(AVFormatContext *s);
61 static int guess_ni_flag(AVFormatContext *s);
64 static void print_tag(const char *str, unsigned int tag, int size)
66 printf("%s: tag=%c%c%c%c size=0x%x\n",
75 static int get_riff(AVIContext *avi, ByteIOContext *pb)
78 /* check RIFF header */
81 if (tag != MKTAG('R', 'I', 'F', 'F'))
83 avi->riff_end = get_le32(pb); /* RIFF chunk size */
84 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
86 if(tag == MKTAG('A', 'V', 'I', 0x19))
87 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
89 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
95 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
96 AVIContext *avi = s->priv_data;
97 ByteIOContext *pb = &s->pb;
98 int longs_pre_entry= get_le16(pb);
99 int index_sub_type = get_byte(pb);
100 int index_type = get_byte(pb);
101 int entries_in_use = get_le32(pb);
102 int chunk_id = get_le32(pb);
103 int64_t base = get_le64(pb);
104 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
108 int64_t last_pos= -1;
109 int64_t filesize= url_fsize(&s->pb);
112 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
113 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
116 if(stream_id > s->nb_streams || stream_id < 0)
118 st= s->streams[stream_id];
126 if(index_type && longs_pre_entry != 2)
131 if(filesize > 0 && base >= filesize){
132 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
133 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
139 for(i=0; i<entries_in_use; i++){
141 int64_t pos= get_le32(pb) + base - 8;
142 int len = get_le32(pb);
147 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
149 if(last_pos == pos || pos == base - 8)
150 avi->non_interleaved= 1;
152 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
162 offset = get_le64(pb);
163 get_le32(pb); /* size */
164 duration = get_le32(pb);
167 url_fseek(pb, offset+8, SEEK_SET);
168 read_braindead_odml_indx(s, frame_num);
169 frame_num += duration;
171 url_fseek(pb, pos, SEEK_SET);
178 static void clean_index(AVFormatContext *s){
182 for(i=0; i<s->nb_streams; i++){
183 AVStream *st = s->streams[i];
184 AVIStream *ast = st->priv_data;
185 int n= st->nb_index_entries;
186 int max= ast->sample_size;
187 int64_t pos, size, ts;
189 if(n != 1 || ast->sample_size==0)
192 while(max < 1024) max+=max;
194 pos= st->index_entries[0].pos;
195 size= st->index_entries[0].size;
196 ts= st->index_entries[0].timestamp;
198 for(j=0; j<size; j+=max){
199 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
204 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
206 offset_t i = url_ftell(pb);
208 get_strz(pb, buf, maxlen);
209 url_fseek(pb, i+size, SEEK_SET);
213 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
215 AVIContext *avi = s->priv_data;
216 ByteIOContext *pb = &s->pb;
217 uint32_t tag, tag1, handler;
218 int codec_type, stream_index, frame_period, bit_rate;
219 unsigned int size, nb_frames;
222 AVIStream *ast = NULL;
225 avi->stream_index= -1;
227 if (get_riff(avi, pb) < 0)
230 avi->fsize = url_fsize(pb);
232 avi->fsize= avi->riff_end;
244 print_tag("tag", tag, size);
248 case MKTAG('L', 'I', 'S', 'T'):
249 /* ignored, except when start of video packets */
252 print_tag("list", tag1, 0);
254 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
255 avi->movi_list = url_ftell(pb) - 4;
256 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
257 else avi->movi_end = url_fsize(pb);
259 printf("movi end=%"PRIx64"\n", avi->movi_end);
264 case MKTAG('d', 'm', 'l', 'h'):
266 url_fskip(pb, size + (size & 1));
268 case MKTAG('a', 'v', 'i', 'h'):
270 /* using frame_period is bad idea */
271 frame_period = get_le32(pb);
272 bit_rate = get_le32(pb) * 8;
274 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
276 url_fskip(pb, 2 * 4);
279 url_fskip(pb, size - 7 * 4);
281 case MKTAG('s', 't', 'r', 'h'):
285 handler = get_le32(pb); /* codec tag */
287 if(tag1 == MKTAG('p', 'a', 'd', 's')){
288 url_fskip(pb, size - 8);
292 st = av_new_stream(s, stream_index);
296 ast = av_mallocz(sizeof(AVIStream));
303 print_tag("strh", tag1, -1);
305 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
309 * After some consideration -- I don't think we
310 * have to support anything but DV in a type1 AVIs.
312 if (s->nb_streams != 1)
315 if (handler != MKTAG('d', 'v', 's', 'd') &&
316 handler != MKTAG('d', 'v', 'h', 'd') &&
317 handler != MKTAG('d', 'v', 's', 'l'))
320 ast = s->streams[0]->priv_data;
321 av_freep(&s->streams[0]->codec->extradata);
322 av_freep(&s->streams[0]);
324 if (ENABLE_DV_DEMUXER) {
325 avi->dv_demux = dv_init_demux(s);
329 s->streams[0]->priv_data = ast;
330 url_fskip(pb, 3 * 4);
331 ast->scale = get_le32(pb);
332 ast->rate = get_le32(pb);
333 url_fskip(pb, 4); /* start time */
335 dv_dur = get_le32(pb);
336 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
337 dv_dur *= AV_TIME_BASE;
338 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
341 * else, leave duration alone; timing estimation in utils.c
342 * will make a guess based on bit rate.
345 stream_index = s->nb_streams - 1;
346 url_fskip(pb, size - 9*4);
350 assert(stream_index < s->nb_streams);
351 st->codec->stream_codec_tag= handler;
353 get_le32(pb); /* flags */
354 get_le16(pb); /* priority */
355 get_le16(pb); /* language */
356 get_le32(pb); /* initial frame */
357 ast->scale = get_le32(pb);
358 ast->rate = get_le32(pb);
359 if(ast->scale && ast->rate){
360 }else if(frame_period){
362 ast->scale = frame_period;
367 av_set_pts_info(st, 64, ast->scale, ast->rate);
369 ast->cum_len=get_le32(pb); /* start */
370 nb_frames = get_le32(pb);
373 st->duration = nb_frames;
374 get_le32(pb); /* buffer size */
375 get_le32(pb); /* quality */
376 ast->sample_size = get_le32(pb); /* sample ssize */
377 ast->cum_len *= FFMAX(1, ast->sample_size);
378 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
381 case MKTAG('v', 'i', 'd', 's'):
382 codec_type = CODEC_TYPE_VIDEO;
384 ast->sample_size = 0;
386 case MKTAG('a', 'u', 'd', 's'):
387 codec_type = CODEC_TYPE_AUDIO;
389 case MKTAG('t', 'x', 't', 's'):
391 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
394 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
397 ast->frame_offset= ast->cum_len;
398 url_fskip(pb, size - 12 * 4);
400 case MKTAG('s', 't', 'r', 'f'):
402 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
405 st = s->streams[stream_index];
407 case CODEC_TYPE_VIDEO:
408 get_le32(pb); /* size */
409 st->codec->width = get_le32(pb);
410 st->codec->height = get_le32(pb);
411 get_le16(pb); /* panes */
412 st->codec->bits_per_sample= get_le16(pb); /* depth */
414 get_le32(pb); /* ImageSize */
415 get_le32(pb); /* XPelsPerMeter */
416 get_le32(pb); /* YPelsPerMeter */
417 get_le32(pb); /* ClrUsed */
418 get_le32(pb); /* ClrImportant */
420 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
421 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
422 st->codec->codec_tag = tag1;
423 st->codec->codec_id = CODEC_ID_XSUB;
427 if(size > 10*4 && size<(1<<30)){
428 st->codec->extradata_size= size - 10*4;
429 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
430 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
433 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
436 /* Extract palette from extradata if bpp <= 8 */
437 /* This code assumes that extradata contains only palette */
438 /* This is true for all paletted codecs implemented in ffmpeg */
439 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
440 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
441 #ifdef WORDS_BIGENDIAN
442 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
443 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
445 memcpy(st->codec->palctrl->palette, st->codec->extradata,
446 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
448 st->codec->palctrl->palette_changed = 1;
452 print_tag("video", tag1, 0);
454 st->codec->codec_type = CODEC_TYPE_VIDEO;
455 st->codec->codec_tag = tag1;
456 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
457 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
458 // url_fskip(pb, size - 5 * 4);
460 case CODEC_TYPE_AUDIO:
461 get_wav_header(pb, st->codec, size);
462 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
463 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
464 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
466 /* Force parsing as several audio frames can be in
467 * one packet and timestamps refer to packet start*/
468 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
469 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
470 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
471 st->need_parsing = AVSTREAM_PARSE_NONE;
472 /* AVI files with Xan DPCM audio (wrongly) declare PCM
473 * audio in the header but have Axan as stream_code_tag. */
474 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
475 st->codec->codec_id = CODEC_ID_XAN_DPCM;
476 st->codec->codec_tag = 0;
480 st->codec->codec_type = CODEC_TYPE_DATA;
481 st->codec->codec_id= CODEC_ID_NONE;
482 st->codec->codec_tag= 0;
488 case MKTAG('i', 'n', 'd', 'x'):
490 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
491 read_braindead_odml_indx(s, 0);
493 url_fseek(pb, i+size, SEEK_SET);
495 case MKTAG('I', 'N', 'A', 'M'):
496 avi_read_tag(pb, s->title, sizeof(s->title), size);
498 case MKTAG('I', 'A', 'R', 'T'):
499 avi_read_tag(pb, s->author, sizeof(s->author), size);
501 case MKTAG('I', 'C', 'O', 'P'):
502 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
504 case MKTAG('I', 'C', 'M', 'T'):
505 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
507 case MKTAG('I', 'G', 'N', 'R'):
508 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
510 case MKTAG('I', 'P', 'R', 'D'):
511 avi_read_tag(pb, s->album, sizeof(s->album), size);
513 case MKTAG('I', 'P', 'R', 'T'):
514 avi_read_tag(pb, str_track, sizeof(str_track), size);
515 sscanf(str_track, "%d", &s->track);
519 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
520 "ill ignore it and try to continue anyway\n");
521 avi->movi_list = url_ftell(pb) - 4;
522 avi->movi_end = url_fsize(pb);
532 /* check stream number */
533 if (stream_index != s->nb_streams - 1) {
535 for(i=0;i<s->nb_streams;i++) {
536 av_freep(&s->streams[i]->codec->extradata);
537 av_freep(&s->streams[i]);
542 if(!avi->index_loaded && !url_is_streamed(pb))
544 avi->index_loaded = 1;
545 avi->non_interleaved |= guess_ni_flag(s);
546 if(avi->non_interleaved)
552 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
554 AVIContext *avi = s->priv_data;
555 ByteIOContext *pb = &s->pb;
560 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
561 size = dv_get_packet(avi->dv_demux, pkt);
566 if(avi->non_interleaved){
567 int best_stream_index = 0;
568 AVStream *best_st= NULL;
570 int64_t best_ts= INT64_MAX;
573 for(i=0; i<s->nb_streams; i++){
574 AVStream *st = s->streams[i];
575 AVIStream *ast = st->priv_data;
576 int64_t ts= ast->frame_offset;
579 ts /= ast->sample_size;
580 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
582 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
586 best_stream_index= i;
589 best_ast = best_st->priv_data;
590 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
591 if(best_ast->remaining)
592 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
594 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
596 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
598 int64_t pos= best_st->index_entries[i].pos;
599 pos += best_ast->packet_size - best_ast->remaining;
600 url_fseek(&s->pb, pos + 8, SEEK_SET);
601 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
603 assert(best_ast->remaining <= best_ast->packet_size);
605 avi->stream_index= best_stream_index;
606 if(!best_ast->remaining)
607 best_ast->packet_size=
608 best_ast->remaining= best_st->index_entries[i].size;
613 if(avi->stream_index >= 0){
614 AVStream *st= s->streams[ avi->stream_index ];
615 AVIStream *ast= st->priv_data;
618 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
620 else if(ast->sample_size < 32)
621 size= 64*ast->sample_size;
623 size= ast->sample_size;
625 if(size > ast->remaining)
626 size= ast->remaining;
627 av_get_packet(pb, pkt, size);
629 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
630 dstr = pkt->destruct;
631 size = dv_produce_packet(avi->dv_demux, pkt,
632 pkt->data, pkt->size);
633 pkt->destruct = dstr;
634 pkt->flags |= PKT_FLAG_KEY;
636 /* XXX: how to handle B frames in avi ? */
637 pkt->dts = ast->frame_offset;
638 // pkt->dts += ast->start;
640 pkt->dts /= ast->sample_size;
641 //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);
642 pkt->stream_index = avi->stream_index;
644 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
647 assert(st->index_entries);
649 index= av_index_search_timestamp(st, pkt->dts, 0);
650 e= &st->index_entries[index];
652 if(index >= 0 && e->timestamp == ast->frame_offset){
653 if (e->flags & AVINDEX_KEYFRAME)
654 pkt->flags |= PKT_FLAG_KEY;
657 pkt->flags |= PKT_FLAG_KEY;
660 ast->frame_offset += pkt->size;
664 ast->remaining -= size;
666 avi->stream_index= -1;
673 memset(d, -1, sizeof(int)*8);
674 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
681 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
683 if( d[2] >= '0' && d[2] <= '9'
684 && d[3] >= '0' && d[3] <= '9'){
685 n= (d[2] - '0') * 10 + (d[3] - '0');
687 n= 100; //invalid stream id
689 //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);
690 if(i + size > avi->fsize || d[0]<0)
694 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
696 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
697 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
699 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
703 if( d[0] >= '0' && d[0] <= '9'
704 && d[1] >= '0' && d[1] <= '9'){
705 n= (d[0] - '0') * 10 + (d[1] - '0');
707 n= 100; //invalid stream id
711 if(n < s->nb_streams){
717 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
718 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
719 || st->discard >= AVDISCARD_ALL){
720 if(ast->sample_size) ast->frame_offset += pkt->size;
721 else ast->frame_offset++;
726 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
727 d[2]*256+d[3] == ast->prefix /*||
728 (d[2] == 'd' && d[3] == 'c') ||
729 (d[2] == 'w' && d[3] == 'b')*/) {
731 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
732 if(d[2]*256+d[3] == ast->prefix)
735 ast->prefix= d[2]*256+d[3];
736 ast->prefix_count= 0;
739 avi->stream_index= n;
740 ast->packet_size= size + 8;
741 ast->remaining= size;
744 uint64_t pos= url_ftell(pb) - 8;
745 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
746 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
752 /* palette changed chunk */
753 if ( d[0] >= '0' && d[0] <= '9'
754 && d[1] >= '0' && d[1] <= '9'
755 && ((d[2] == 'p' && d[3] == 'c'))
756 && n < s->nb_streams && i + size <= avi->fsize) {
759 int first, clr, flags, k, p;
763 first = get_byte(pb);
765 if(!clr) /* all 256 colors used */
767 flags = get_le16(pb);
769 for (k = first; k < clr + first; k++) {
775 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
777 st->codec->palctrl->palette_changed = 1;
786 /* XXX: we make the implicit supposition that the position are sorted
788 static int avi_read_idx1(AVFormatContext *s, int size)
790 AVIContext *avi = s->priv_data;
791 ByteIOContext *pb = &s->pb;
792 int nb_index_entries, i;
795 unsigned int index, tag, flags, pos, len;
796 unsigned last_pos= -1;
798 nb_index_entries = size / 16;
799 if (nb_index_entries <= 0)
802 /* read the entries and sort them in each stream component */
803 for(i = 0; i < nb_index_entries; i++) {
805 flags = get_le32(pb);
808 #if defined(DEBUG_SEEK)
809 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
810 i, tag, flags, pos, len);
812 if(i==0 && pos > avi->movi_list)
813 avi->movi_list= 0; //FIXME better check
814 pos += avi->movi_list;
816 index = ((tag & 0xff) - '0') * 10;
817 index += ((tag >> 8) & 0xff) - '0';
818 if (index >= s->nb_streams)
820 st = s->streams[index];
823 #if defined(DEBUG_SEEK)
824 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
827 avi->non_interleaved= 1;
829 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
839 static int guess_ni_flag(AVFormatContext *s){
841 int64_t last_start=0;
842 int64_t first_end= INT64_MAX;
844 for(i=0; i<s->nb_streams; i++){
845 AVStream *st = s->streams[i];
846 int n= st->nb_index_entries;
851 if(st->index_entries[0].pos > last_start)
852 last_start= st->index_entries[0].pos;
853 if(st->index_entries[n-1].pos < first_end)
854 first_end= st->index_entries[n-1].pos;
856 return last_start > first_end;
859 static int avi_load_index(AVFormatContext *s)
861 AVIContext *avi = s->priv_data;
862 ByteIOContext *pb = &s->pb;
864 offset_t pos= url_ftell(pb);
866 url_fseek(pb, avi->movi_end, SEEK_SET);
868 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
876 printf("tag=%c%c%c%c size=0x%x\n",
884 case MKTAG('i', 'd', 'x', '1'):
885 if (avi_read_idx1(s, size) < 0)
898 url_fseek(pb, pos, SEEK_SET);
902 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
904 AVIContext *avi = s->priv_data;
909 if (!avi->index_loaded) {
910 /* we only load the index on demand */
912 avi->index_loaded = 1;
914 assert(stream_index>= 0);
916 st = s->streams[stream_index];
917 index= av_index_search_timestamp(st, timestamp, flags);
921 /* find the position */
922 pos = st->index_entries[index].pos;
923 timestamp = st->index_entries[index].timestamp;
925 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
927 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
928 /* One and only one real stream for DV in AVI, and it has video */
929 /* offsets. Calling with other stream indices should have failed */
930 /* the av_index_search_timestamp call above. */
931 assert(stream_index == 0);
933 /* Feed the DV video stream version of the timestamp to the */
934 /* DV demux so it can synth correct timestamps */
935 dv_offset_reset(avi->dv_demux, timestamp);
937 url_fseek(&s->pb, pos, SEEK_SET);
938 avi->stream_index= -1;
942 for(i = 0; i < s->nb_streams; i++) {
943 AVStream *st2 = s->streams[i];
944 AVIStream *ast2 = st2->priv_data;
949 if (st2->nb_index_entries <= 0)
952 // assert(st2->codec->block_align);
953 assert(st2->time_base.den == ast2->rate);
954 assert(st2->time_base.num == ast2->scale);
955 index = av_index_search_timestamp(
957 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
958 flags | AVSEEK_FLAG_BACKWARD);
962 if(!avi->non_interleaved){
963 while(index>0 && st2->index_entries[index].pos > pos)
965 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
969 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
970 /* extract the current frame number */
971 ast2->frame_offset = st2->index_entries[index].timestamp;
972 if(ast2->sample_size)
973 ast2->frame_offset *=ast2->sample_size;
977 url_fseek(&s->pb, pos, SEEK_SET);
978 avi->stream_index= -1;
982 static int avi_read_close(AVFormatContext *s)
985 AVIContext *avi = s->priv_data;
987 for(i=0;i<s->nb_streams;i++) {
988 AVStream *st = s->streams[i];
989 AVIStream *ast = st->priv_data;
991 av_free(st->codec->palctrl);
995 av_free(avi->dv_demux);
1000 static int avi_probe(AVProbeData *p)
1002 /* check file header */
1003 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
1004 p->buf[2] == 'F' && p->buf[3] == 'F' &&
1005 p->buf[8] == 'A' && p->buf[9] == 'V' &&
1006 p->buf[10] == 'I' && (p->buf[11] == ' ' || p->buf[11] == 0x19))
1007 return AVPROBE_SCORE_MAX;
1012 AVInputFormat avi_demuxer = {