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 const char avi_headers[][8] = {
61 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
62 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
63 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
64 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
65 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
69 static int avi_load_index(AVFormatContext *s);
70 static int guess_ni_flag(AVFormatContext *s);
73 static void print_tag(const char *str, unsigned int tag, int size)
75 printf("%s: tag=%c%c%c%c size=0x%x\n",
84 static int get_riff(AVIContext *avi, ByteIOContext *pb)
89 /* check RIFF header */
90 get_buffer(pb, header, 4);
91 avi->riff_end = get_le32(pb); /* RIFF chunk size */
92 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
93 get_buffer(pb, header+4, 4);
95 for(i=0; avi_headers[i][0]; i++)
96 if(!memcmp(header, avi_headers[i], 8))
98 if(!avi_headers[i][0])
101 if(header[7] == 0x19)
102 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
107 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
108 AVIContext *avi = s->priv_data;
109 ByteIOContext *pb = s->pb;
110 int longs_pre_entry= get_le16(pb);
111 int index_sub_type = get_byte(pb);
112 int index_type = get_byte(pb);
113 int entries_in_use = get_le32(pb);
114 int chunk_id = get_le32(pb);
115 int64_t base = get_le64(pb);
116 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
120 int64_t last_pos= -1;
121 int64_t filesize= url_fsize(s->pb);
124 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
125 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
128 if(stream_id > s->nb_streams || stream_id < 0)
130 st= s->streams[stream_id];
138 if(index_type && longs_pre_entry != 2)
143 if(filesize > 0 && base >= filesize){
144 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
145 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
151 for(i=0; i<entries_in_use; i++){
153 int64_t pos= get_le32(pb) + base - 8;
154 int len = get_le32(pb);
159 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
161 if(last_pos == pos || pos == base - 8)
162 avi->non_interleaved= 1;
164 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
174 offset = get_le64(pb);
175 get_le32(pb); /* size */
176 duration = get_le32(pb);
179 url_fseek(pb, offset+8, SEEK_SET);
180 read_braindead_odml_indx(s, frame_num);
181 frame_num += duration;
183 url_fseek(pb, pos, SEEK_SET);
190 static void clean_index(AVFormatContext *s){
194 for(i=0; i<s->nb_streams; i++){
195 AVStream *st = s->streams[i];
196 AVIStream *ast = st->priv_data;
197 int n= st->nb_index_entries;
198 int max= ast->sample_size;
199 int64_t pos, size, ts;
201 if(n != 1 || ast->sample_size==0)
204 while(max < 1024) max+=max;
206 pos= st->index_entries[0].pos;
207 size= st->index_entries[0].size;
208 ts= st->index_entries[0].timestamp;
210 for(j=0; j<size; j+=max){
211 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
216 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
218 offset_t i = url_ftell(pb);
220 get_strz(pb, buf, maxlen);
221 url_fseek(pb, i+size, SEEK_SET);
225 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
227 AVIContext *avi = s->priv_data;
228 ByteIOContext *pb = s->pb;
229 uint32_t tag, tag1, handler;
230 int codec_type, stream_index, frame_period, bit_rate;
231 unsigned int size, nb_frames;
234 AVIStream *ast = NULL;
236 int avih_width=0, avih_height=0;
237 int amv_file_format=0;
239 avi->stream_index= -1;
241 if (get_riff(avi, pb) < 0)
244 avi->fsize = url_fsize(pb);
246 avi->fsize= avi->riff_end;
258 print_tag("tag", tag, size);
262 case MKTAG('L', 'I', 'S', 'T'):
263 /* ignored, except when start of video packets */
266 print_tag("list", tag1, 0);
268 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
269 avi->movi_list = url_ftell(pb) - 4;
270 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
271 else avi->movi_end = url_fsize(pb);
273 printf("movi end=%"PRIx64"\n", avi->movi_end);
278 case MKTAG('d', 'm', 'l', 'h'):
280 url_fskip(pb, size + (size & 1));
282 case MKTAG('a', 'm', 'v', 'h'):
284 case MKTAG('a', 'v', 'i', 'h'):
286 /* using frame_period is bad idea */
287 frame_period = get_le32(pb);
288 bit_rate = get_le32(pb) * 8;
290 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
292 url_fskip(pb, 2 * 4);
295 avih_width=get_le32(pb);
296 avih_height=get_le32(pb);
298 url_fskip(pb, size - 10 * 4);
300 case MKTAG('s', 't', 'r', 'h'):
304 handler = get_le32(pb); /* codec tag */
306 if(tag1 == MKTAG('p', 'a', 'd', 's')){
307 url_fskip(pb, size - 8);
311 st = av_new_stream(s, stream_index);
315 ast = av_mallocz(sizeof(AVIStream));
321 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
324 print_tag("strh", tag1, -1);
326 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
330 * After some consideration -- I don't think we
331 * have to support anything but DV in a type1 AVIs.
333 if (s->nb_streams != 1)
336 if (handler != MKTAG('d', 'v', 's', 'd') &&
337 handler != MKTAG('d', 'v', 'h', 'd') &&
338 handler != MKTAG('d', 'v', 's', 'l'))
341 ast = s->streams[0]->priv_data;
342 av_freep(&s->streams[0]->codec->extradata);
343 av_freep(&s->streams[0]);
345 if (ENABLE_DV_DEMUXER) {
346 avi->dv_demux = dv_init_demux(s);
350 s->streams[0]->priv_data = ast;
351 url_fskip(pb, 3 * 4);
352 ast->scale = get_le32(pb);
353 ast->rate = get_le32(pb);
354 url_fskip(pb, 4); /* start time */
356 dv_dur = get_le32(pb);
357 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
358 dv_dur *= AV_TIME_BASE;
359 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
362 * else, leave duration alone; timing estimation in utils.c
363 * will make a guess based on bit rate.
366 stream_index = s->nb_streams - 1;
367 url_fskip(pb, size - 9*4);
371 assert(stream_index < s->nb_streams);
372 st->codec->stream_codec_tag= handler;
374 get_le32(pb); /* flags */
375 get_le16(pb); /* priority */
376 get_le16(pb); /* language */
377 get_le32(pb); /* initial frame */
378 ast->scale = get_le32(pb);
379 ast->rate = get_le32(pb);
380 if(ast->scale && ast->rate){
381 }else if(frame_period){
383 ast->scale = frame_period;
388 av_set_pts_info(st, 64, ast->scale, ast->rate);
390 ast->cum_len=get_le32(pb); /* start */
391 nb_frames = get_le32(pb);
394 st->duration = nb_frames;
395 get_le32(pb); /* buffer size */
396 get_le32(pb); /* quality */
397 ast->sample_size = get_le32(pb); /* sample ssize */
398 ast->cum_len *= FFMAX(1, ast->sample_size);
399 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
402 case MKTAG('v', 'i', 'd', 's'):
403 codec_type = CODEC_TYPE_VIDEO;
405 ast->sample_size = 0;
407 case MKTAG('a', 'u', 'd', 's'):
408 codec_type = CODEC_TYPE_AUDIO;
410 case MKTAG('t', 'x', 't', 's'):
412 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
415 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
418 ast->frame_offset= ast->cum_len;
419 url_fskip(pb, size - 12 * 4);
421 case MKTAG('s', 't', 'r', 'f'):
423 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
426 st = s->streams[stream_index];
428 case CODEC_TYPE_VIDEO:
430 st->codec->width=avih_width;
431 st->codec->height=avih_height;
432 st->codec->codec_type = CODEC_TYPE_VIDEO;
433 st->codec->codec_id = CODEC_ID_AMV;
437 get_le32(pb); /* size */
438 st->codec->width = get_le32(pb);
439 st->codec->height = get_le32(pb);
440 get_le16(pb); /* panes */
441 st->codec->bits_per_sample= get_le16(pb); /* depth */
443 get_le32(pb); /* ImageSize */
444 get_le32(pb); /* XPelsPerMeter */
445 get_le32(pb); /* YPelsPerMeter */
446 get_le32(pb); /* ClrUsed */
447 get_le32(pb); /* ClrImportant */
449 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
450 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
451 st->codec->codec_tag = tag1;
452 st->codec->codec_id = CODEC_ID_XSUB;
456 if(size > 10*4 && size<(1<<30)){
457 st->codec->extradata_size= size - 10*4;
458 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
459 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
462 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
465 /* Extract palette from extradata if bpp <= 8 */
466 /* This code assumes that extradata contains only palette */
467 /* This is true for all paletted codecs implemented in ffmpeg */
468 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
469 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
470 #ifdef WORDS_BIGENDIAN
471 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
472 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
474 memcpy(st->codec->palctrl->palette, st->codec->extradata,
475 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
477 st->codec->palctrl->palette_changed = 1;
481 print_tag("video", tag1, 0);
483 st->codec->codec_type = CODEC_TYPE_VIDEO;
484 st->codec->codec_tag = tag1;
485 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
486 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
487 // url_fskip(pb, size - 5 * 4);
489 case CODEC_TYPE_AUDIO:
490 get_wav_header(pb, st->codec, size);
491 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
492 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
493 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
495 /* Force parsing as several audio frames can be in
496 * one packet and timestamps refer to packet start*/
497 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
498 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
499 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
500 st->need_parsing = AVSTREAM_PARSE_NONE;
501 /* AVI files with Xan DPCM audio (wrongly) declare PCM
502 * audio in the header but have Axan as stream_code_tag. */
503 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
504 st->codec->codec_id = CODEC_ID_XAN_DPCM;
505 st->codec->codec_tag = 0;
508 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
511 st->codec->codec_type = CODEC_TYPE_DATA;
512 st->codec->codec_id= CODEC_ID_NONE;
513 st->codec->codec_tag= 0;
519 case MKTAG('i', 'n', 'd', 'x'):
521 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
522 read_braindead_odml_indx(s, 0);
524 url_fseek(pb, i+size, SEEK_SET);
526 case MKTAG('I', 'N', 'A', 'M'):
527 avi_read_tag(pb, s->title, sizeof(s->title), size);
529 case MKTAG('I', 'A', 'R', 'T'):
530 avi_read_tag(pb, s->author, sizeof(s->author), size);
532 case MKTAG('I', 'C', 'O', 'P'):
533 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
535 case MKTAG('I', 'C', 'M', 'T'):
536 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
538 case MKTAG('I', 'G', 'N', 'R'):
539 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
541 case MKTAG('I', 'P', 'R', 'D'):
542 avi_read_tag(pb, s->album, sizeof(s->album), size);
544 case MKTAG('I', 'P', 'R', 'T'):
545 avi_read_tag(pb, str_track, sizeof(str_track), size);
546 sscanf(str_track, "%d", &s->track);
550 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
551 "ill ignore it and try to continue anyway\n");
552 avi->movi_list = url_ftell(pb) - 4;
553 avi->movi_end = url_fsize(pb);
563 /* check stream number */
564 if (stream_index != s->nb_streams - 1) {
566 for(i=0;i<s->nb_streams;i++) {
567 av_freep(&s->streams[i]->codec->extradata);
568 av_freep(&s->streams[i]);
573 if(!avi->index_loaded && !url_is_streamed(pb))
575 avi->index_loaded = 1;
576 avi->non_interleaved |= guess_ni_flag(s);
577 if(avi->non_interleaved)
583 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
585 AVIContext *avi = s->priv_data;
586 ByteIOContext *pb = s->pb;
591 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
592 size = dv_get_packet(avi->dv_demux, pkt);
597 if(avi->non_interleaved){
598 int best_stream_index = 0;
599 AVStream *best_st= NULL;
601 int64_t best_ts= INT64_MAX;
604 for(i=0; i<s->nb_streams; i++){
605 AVStream *st = s->streams[i];
606 AVIStream *ast = st->priv_data;
607 int64_t ts= ast->frame_offset;
610 ts /= ast->sample_size;
611 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
613 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
617 best_stream_index= i;
620 best_ast = best_st->priv_data;
621 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
622 if(best_ast->remaining)
623 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
625 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
627 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
629 int64_t pos= best_st->index_entries[i].pos;
630 pos += best_ast->packet_size - best_ast->remaining;
631 url_fseek(s->pb, pos + 8, SEEK_SET);
632 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
634 assert(best_ast->remaining <= best_ast->packet_size);
636 avi->stream_index= best_stream_index;
637 if(!best_ast->remaining)
638 best_ast->packet_size=
639 best_ast->remaining= best_st->index_entries[i].size;
644 if(avi->stream_index >= 0){
645 AVStream *st= s->streams[ avi->stream_index ];
646 AVIStream *ast= st->priv_data;
649 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
651 else if(ast->sample_size < 32)
652 size= 64*ast->sample_size;
654 size= ast->sample_size;
656 if(size > ast->remaining)
657 size= ast->remaining;
658 av_get_packet(pb, pkt, size);
660 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
661 dstr = pkt->destruct;
662 size = dv_produce_packet(avi->dv_demux, pkt,
663 pkt->data, pkt->size);
664 pkt->destruct = dstr;
665 pkt->flags |= PKT_FLAG_KEY;
667 /* XXX: how to handle B frames in avi ? */
668 pkt->dts = ast->frame_offset;
669 // pkt->dts += ast->start;
671 pkt->dts /= ast->sample_size;
672 //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);
673 pkt->stream_index = avi->stream_index;
675 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
678 assert(st->index_entries);
680 index= av_index_search_timestamp(st, pkt->dts, 0);
681 e= &st->index_entries[index];
683 if(index >= 0 && e->timestamp == ast->frame_offset){
684 if (e->flags & AVINDEX_KEYFRAME)
685 pkt->flags |= PKT_FLAG_KEY;
688 pkt->flags |= PKT_FLAG_KEY;
691 ast->frame_offset += pkt->size;
695 ast->remaining -= size;
697 avi->stream_index= -1;
704 memset(d, -1, sizeof(int)*8);
705 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
712 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
714 if( d[2] >= '0' && d[2] <= '9'
715 && d[3] >= '0' && d[3] <= '9'){
716 n= (d[2] - '0') * 10 + (d[3] - '0');
718 n= 100; //invalid stream id
720 //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);
721 if(i + size > avi->fsize || d[0]<0)
725 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
727 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
728 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
730 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
734 if( d[0] >= '0' && d[0] <= '9'
735 && d[1] >= '0' && d[1] <= '9'){
736 n= (d[0] - '0') * 10 + (d[1] - '0');
738 n= 100; //invalid stream id
742 if(n < s->nb_streams){
748 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
749 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
750 || st->discard >= AVDISCARD_ALL){
751 if(ast->sample_size) ast->frame_offset += pkt->size;
752 else ast->frame_offset++;
757 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
758 d[2]*256+d[3] == ast->prefix /*||
759 (d[2] == 'd' && d[3] == 'c') ||
760 (d[2] == 'w' && d[3] == 'b')*/) {
762 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
763 if(d[2]*256+d[3] == ast->prefix)
766 ast->prefix= d[2]*256+d[3];
767 ast->prefix_count= 0;
770 avi->stream_index= n;
771 ast->packet_size= size + 8;
772 ast->remaining= size;
775 uint64_t pos= url_ftell(pb) - 8;
776 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
777 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
783 /* palette changed chunk */
784 if ( d[0] >= '0' && d[0] <= '9'
785 && d[1] >= '0' && d[1] <= '9'
786 && ((d[2] == 'p' && d[3] == 'c'))
787 && n < s->nb_streams && i + size <= avi->fsize) {
790 int first, clr, flags, k, p;
794 first = get_byte(pb);
796 if(!clr) /* all 256 colors used */
798 flags = get_le16(pb);
800 for (k = first; k < clr + first; k++) {
806 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
808 st->codec->palctrl->palette_changed = 1;
817 /* XXX: we make the implicit supposition that the position are sorted
819 static int avi_read_idx1(AVFormatContext *s, int size)
821 AVIContext *avi = s->priv_data;
822 ByteIOContext *pb = s->pb;
823 int nb_index_entries, i;
826 unsigned int index, tag, flags, pos, len;
827 unsigned last_pos= -1;
829 nb_index_entries = size / 16;
830 if (nb_index_entries <= 0)
833 /* read the entries and sort them in each stream component */
834 for(i = 0; i < nb_index_entries; i++) {
836 flags = get_le32(pb);
839 #if defined(DEBUG_SEEK)
840 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
841 i, tag, flags, pos, len);
843 if(i==0 && pos > avi->movi_list)
844 avi->movi_list= 0; //FIXME better check
845 pos += avi->movi_list;
847 index = ((tag & 0xff) - '0') * 10;
848 index += ((tag >> 8) & 0xff) - '0';
849 if (index >= s->nb_streams)
851 st = s->streams[index];
854 #if defined(DEBUG_SEEK)
855 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
858 avi->non_interleaved= 1;
860 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
870 static int guess_ni_flag(AVFormatContext *s){
872 int64_t last_start=0;
873 int64_t first_end= INT64_MAX;
875 for(i=0; i<s->nb_streams; i++){
876 AVStream *st = s->streams[i];
877 int n= st->nb_index_entries;
882 if(st->index_entries[0].pos > last_start)
883 last_start= st->index_entries[0].pos;
884 if(st->index_entries[n-1].pos < first_end)
885 first_end= st->index_entries[n-1].pos;
887 return last_start > first_end;
890 static int avi_load_index(AVFormatContext *s)
892 AVIContext *avi = s->priv_data;
893 ByteIOContext *pb = s->pb;
895 offset_t pos= url_ftell(pb);
897 url_fseek(pb, avi->movi_end, SEEK_SET);
899 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
907 printf("tag=%c%c%c%c size=0x%x\n",
915 case MKTAG('i', 'd', 'x', '1'):
916 if (avi_read_idx1(s, size) < 0)
929 url_fseek(pb, pos, SEEK_SET);
933 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
935 AVIContext *avi = s->priv_data;
940 if (!avi->index_loaded) {
941 /* we only load the index on demand */
943 avi->index_loaded = 1;
945 assert(stream_index>= 0);
947 st = s->streams[stream_index];
948 index= av_index_search_timestamp(st, timestamp, flags);
952 /* find the position */
953 pos = st->index_entries[index].pos;
954 timestamp = st->index_entries[index].timestamp;
956 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
958 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
959 /* One and only one real stream for DV in AVI, and it has video */
960 /* offsets. Calling with other stream indices should have failed */
961 /* the av_index_search_timestamp call above. */
962 assert(stream_index == 0);
964 /* Feed the DV video stream version of the timestamp to the */
965 /* DV demux so it can synth correct timestamps */
966 dv_offset_reset(avi->dv_demux, timestamp);
968 url_fseek(s->pb, pos, SEEK_SET);
969 avi->stream_index= -1;
973 for(i = 0; i < s->nb_streams; i++) {
974 AVStream *st2 = s->streams[i];
975 AVIStream *ast2 = st2->priv_data;
980 if (st2->nb_index_entries <= 0)
983 // assert(st2->codec->block_align);
984 assert(st2->time_base.den == ast2->rate);
985 assert(st2->time_base.num == ast2->scale);
986 index = av_index_search_timestamp(
988 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
989 flags | AVSEEK_FLAG_BACKWARD);
993 if(!avi->non_interleaved){
994 while(index>0 && st2->index_entries[index].pos > pos)
996 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1000 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1001 /* extract the current frame number */
1002 ast2->frame_offset = st2->index_entries[index].timestamp;
1003 if(ast2->sample_size)
1004 ast2->frame_offset *=ast2->sample_size;
1008 url_fseek(s->pb, pos, SEEK_SET);
1009 avi->stream_index= -1;
1013 static int avi_read_close(AVFormatContext *s)
1016 AVIContext *avi = s->priv_data;
1018 for(i=0;i<s->nb_streams;i++) {
1019 AVStream *st = s->streams[i];
1020 AVIStream *ast = st->priv_data;
1022 av_free(st->codec->palctrl);
1026 av_free(avi->dv_demux);
1031 static int avi_probe(AVProbeData *p)
1035 /* check file header */
1036 for(i=0; avi_headers[i][0]; i++)
1037 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1038 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1039 return AVPROBE_SCORE_MAX;
1044 AVInputFormat avi_demuxer = {