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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/bswap.h"
35 typedef struct AVIStream {
36 int64_t frame_offset; /* current frame (video) or byte (audio) counter
37 (used to compute the pts) */
43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45 int64_t cum_len; /* temporary storage (used during seek) */
47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
63 DVDemuxContext* dv_demux;
66 static const char avi_headers[][8] = {
67 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
68 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
69 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
70 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
71 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
75 static int avi_load_index(AVFormatContext *s);
76 static int guess_ni_flag(AVFormatContext *s);
79 static void print_tag(const char *str, unsigned int tag, int size)
81 printf("%s: tag=%c%c%c%c size=0x%x\n",
90 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
92 AVIContext *avi = s->priv_data;
96 /* check RIFF header */
97 get_buffer(pb, header, 4);
98 avi->riff_end = get_le32(pb); /* RIFF chunk size */
99 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
100 get_buffer(pb, header+4, 4);
102 for(i=0; avi_headers[i][0]; i++)
103 if(!memcmp(header, avi_headers[i], 8))
105 if(!avi_headers[i][0])
108 if(header[7] == 0x19)
109 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
114 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
115 AVIContext *avi = s->priv_data;
116 ByteIOContext *pb = s->pb;
117 int longs_pre_entry= get_le16(pb);
118 int index_sub_type = get_byte(pb);
119 int index_type = get_byte(pb);
120 int entries_in_use = get_le32(pb);
121 int chunk_id = get_le32(pb);
122 int64_t base = get_le64(pb);
123 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
127 int64_t last_pos= -1;
128 int64_t filesize= url_fsize(s->pb);
131 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
132 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
135 if(stream_id > s->nb_streams || stream_id < 0)
137 st= s->streams[stream_id];
145 if(index_type && longs_pre_entry != 2)
150 if(filesize > 0 && base >= filesize){
151 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
152 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
158 for(i=0; i<entries_in_use; i++){
160 int64_t pos= get_le32(pb) + base - 8;
161 int len = get_le32(pb);
166 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
171 if(last_pos == pos || pos == base - 8)
172 avi->non_interleaved= 1;
174 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
184 offset = get_le64(pb);
185 get_le32(pb); /* size */
186 duration = get_le32(pb);
193 url_fseek(pb, offset+8, SEEK_SET);
194 read_braindead_odml_indx(s, frame_num);
195 frame_num += duration;
197 url_fseek(pb, pos, SEEK_SET);
204 static void clean_index(AVFormatContext *s){
208 for(i=0; i<s->nb_streams; i++){
209 AVStream *st = s->streams[i];
210 AVIStream *ast = st->priv_data;
211 int n= st->nb_index_entries;
212 int max= ast->sample_size;
213 int64_t pos, size, ts;
215 if(n != 1 || ast->sample_size==0)
218 while(max < 1024) max+=max;
220 pos= st->index_entries[0].pos;
221 size= st->index_entries[0].size;
222 ts= st->index_entries[0].timestamp;
224 for(j=0; j<size; j+=max){
225 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
230 static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size)
232 ByteIOContext *pb = s->pb;
235 int64_t i = url_ftell(pb);
237 get_strz(pb, value, sizeof(value));
238 url_fseek(pb, i+size, SEEK_SET);
240 return av_metadata_set(&s->metadata, key, value);
243 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
245 AVIContext *avi = s->priv_data;
246 ByteIOContext *pb = s->pb;
247 unsigned int tag, tag1, handler;
248 int codec_type, stream_index, frame_period, bit_rate;
249 unsigned int size, nb_frames;
252 AVIStream *ast = NULL;
253 int avih_width=0, avih_height=0;
254 int amv_file_format=0;
256 avi->stream_index= -1;
258 if (get_riff(s, pb) < 0)
261 avi->fsize = url_fsize(pb);
263 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
275 print_tag("tag", tag, size);
279 case MKTAG('L', 'I', 'S', 'T'):
280 /* Ignored, except at start of video packets. */
283 print_tag("list", tag1, 0);
285 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
286 avi->movi_list = url_ftell(pb) - 4;
287 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
288 else avi->movi_end = url_fsize(pb);
290 printf("movi end=%"PRIx64"\n", avi->movi_end);
295 case MKTAG('d', 'm', 'l', 'h'):
297 url_fskip(pb, size + (size & 1));
299 case MKTAG('a', 'm', 'v', 'h'):
301 case MKTAG('a', 'v', 'i', 'h'):
303 /* using frame_period is bad idea */
304 frame_period = get_le32(pb);
305 bit_rate = get_le32(pb) * 8;
307 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
309 url_fskip(pb, 2 * 4);
312 avih_width=get_le32(pb);
313 avih_height=get_le32(pb);
315 url_fskip(pb, size - 10 * 4);
317 case MKTAG('s', 't', 'r', 'h'):
321 handler = get_le32(pb); /* codec tag */
323 if(tag1 == MKTAG('p', 'a', 'd', 's')){
324 url_fskip(pb, size - 8);
328 st = av_new_stream(s, stream_index);
332 ast = av_mallocz(sizeof(AVIStream));
338 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
341 print_tag("strh", tag1, -1);
343 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
347 * After some consideration -- I don't think we
348 * have to support anything but DV in type1 AVIs.
350 if (s->nb_streams != 1)
353 if (handler != MKTAG('d', 'v', 's', 'd') &&
354 handler != MKTAG('d', 'v', 'h', 'd') &&
355 handler != MKTAG('d', 'v', 's', 'l'))
358 ast = s->streams[0]->priv_data;
359 av_freep(&s->streams[0]->codec->extradata);
360 av_freep(&s->streams[0]);
362 if (CONFIG_DV_DEMUXER) {
363 avi->dv_demux = dv_init_demux(s);
367 s->streams[0]->priv_data = ast;
368 url_fskip(pb, 3 * 4);
369 ast->scale = get_le32(pb);
370 ast->rate = get_le32(pb);
371 url_fskip(pb, 4); /* start time */
373 dv_dur = get_le32(pb);
374 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
375 dv_dur *= AV_TIME_BASE;
376 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
379 * else, leave duration alone; timing estimation in utils.c
380 * will make a guess based on bitrate.
383 stream_index = s->nb_streams - 1;
384 url_fskip(pb, size - 9*4);
388 assert(stream_index < s->nb_streams);
389 st->codec->stream_codec_tag= handler;
391 get_le32(pb); /* flags */
392 get_le16(pb); /* priority */
393 get_le16(pb); /* language */
394 get_le32(pb); /* initial frame */
395 ast->scale = get_le32(pb);
396 ast->rate = get_le32(pb);
397 if(!(ast->scale && ast->rate)){
398 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
401 ast->scale = frame_period;
407 av_set_pts_info(st, 64, ast->scale, ast->rate);
409 ast->cum_len=get_le32(pb); /* start */
410 nb_frames = get_le32(pb);
413 st->duration = nb_frames;
414 get_le32(pb); /* buffer size */
415 get_le32(pb); /* quality */
416 ast->sample_size = get_le32(pb); /* sample ssize */
417 ast->cum_len *= FFMAX(1, ast->sample_size);
418 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
421 case MKTAG('v', 'i', 'd', 's'):
422 codec_type = CODEC_TYPE_VIDEO;
424 ast->sample_size = 0;
426 case MKTAG('a', 'u', 'd', 's'):
427 codec_type = CODEC_TYPE_AUDIO;
429 case MKTAG('t', 'x', 't', 's'):
431 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
433 case MKTAG('d', 'a', 't', 's'):
434 codec_type = CODEC_TYPE_DATA;
437 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
440 ast->frame_offset= ast->cum_len;
441 url_fskip(pb, size - 12 * 4);
443 case MKTAG('s', 't', 'r', 'f'):
445 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
448 st = s->streams[stream_index];
450 case CODEC_TYPE_VIDEO:
452 st->codec->width=avih_width;
453 st->codec->height=avih_height;
454 st->codec->codec_type = CODEC_TYPE_VIDEO;
455 st->codec->codec_id = CODEC_ID_AMV;
459 get_le32(pb); /* size */
460 st->codec->width = get_le32(pb);
461 st->codec->height = (int32_t)get_le32(pb);
462 get_le16(pb); /* panes */
463 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
465 get_le32(pb); /* ImageSize */
466 get_le32(pb); /* XPelsPerMeter */
467 get_le32(pb); /* YPelsPerMeter */
468 get_le32(pb); /* ClrUsed */
469 get_le32(pb); /* ClrImportant */
471 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
472 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
473 st->codec->codec_tag = tag1;
474 st->codec->codec_id = CODEC_ID_XSUB;
478 if(size > 10*4 && size<(1<<30)){
479 st->codec->extradata_size= size - 10*4;
480 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
481 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
484 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
487 /* Extract palette from extradata if bpp <= 8. */
488 /* This code assumes that extradata contains only palette. */
489 /* This is true for all paletted codecs implemented in FFmpeg. */
490 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
491 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
492 #ifdef WORDS_BIGENDIAN
493 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
494 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
496 memcpy(st->codec->palctrl->palette, st->codec->extradata,
497 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
499 st->codec->palctrl->palette_changed = 1;
503 print_tag("video", tag1, 0);
505 st->codec->codec_type = CODEC_TYPE_VIDEO;
506 st->codec->codec_tag = tag1;
507 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
508 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
510 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
511 st->codec->extradata_size+= 9;
512 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
513 if(st->codec->extradata)
514 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
516 st->codec->height= FFABS(st->codec->height);
518 // url_fskip(pb, size - 5 * 4);
520 case CODEC_TYPE_AUDIO:
521 get_wav_header(pb, st->codec, size);
522 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
523 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
524 ast->sample_size= st->codec->block_align;
526 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
528 /* Force parsing as several audio frames can be in
529 * one packet and timestamps refer to packet start. */
530 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
531 /* ADTS header is in extradata, AAC without header must be
532 * stored as exact frames. Parser not needed and it will
534 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
535 st->need_parsing = AVSTREAM_PARSE_NONE;
536 /* AVI files with Xan DPCM audio (wrongly) declare PCM
537 * audio in the header but have Axan as stream_code_tag. */
538 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
539 st->codec->codec_id = CODEC_ID_XAN_DPCM;
540 st->codec->codec_tag = 0;
543 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
546 st->codec->codec_type = CODEC_TYPE_DATA;
547 st->codec->codec_id= CODEC_ID_NONE;
548 st->codec->codec_tag= 0;
554 case MKTAG('i', 'n', 'd', 'x'):
556 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
557 read_braindead_odml_indx(s, 0);
559 url_fseek(pb, i+size, SEEK_SET);
561 case MKTAG('v', 'p', 'r', 'p'):
562 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
563 AVRational active, active_aspect;
565 st = s->streams[stream_index];
572 active_aspect.den= get_le16(pb);
573 active_aspect.num= get_le16(pb);
574 active.num = get_le32(pb);
575 active.den = get_le32(pb);
576 get_le32(pb); //nbFieldsPerFrame
578 if(active_aspect.num && active_aspect.den && active.num && active.den){
579 st->sample_aspect_ratio= av_div_q(active_aspect, active);
580 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
584 url_fseek(pb, size, SEEK_CUR);
586 case MKTAG('I', 'N', 'A', 'M'):
587 avi_read_tag(s, "Title", size);
589 case MKTAG('I', 'A', 'R', 'T'):
590 avi_read_tag(s, "Artist", size);
592 case MKTAG('I', 'C', 'O', 'P'):
593 avi_read_tag(s, "Copyright", size);
595 case MKTAG('I', 'C', 'M', 'T'):
596 avi_read_tag(s, "Comment", size);
598 case MKTAG('I', 'G', 'N', 'R'):
599 avi_read_tag(s, "Genre", size);
601 case MKTAG('I', 'P', 'R', 'D'):
602 avi_read_tag(s, "Album", size);
604 case MKTAG('I', 'P', 'R', 'T'):
605 avi_read_tag(s, "Track", size);
609 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
610 "I will ignore it and try to continue anyway.\n");
611 avi->movi_list = url_ftell(pb) - 4;
612 avi->movi_end = url_fsize(pb);
622 /* check stream number */
623 if (stream_index != s->nb_streams - 1) {
628 if(!avi->index_loaded && !url_is_streamed(pb))
630 avi->index_loaded = 1;
631 avi->non_interleaved |= guess_ni_flag(s);
632 if(avi->non_interleaved) {
633 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
640 static int get_stream_idx(int *d){
641 if( d[0] >= '0' && d[0] <= '9'
642 && d[1] >= '0' && d[1] <= '9'){
643 return (d[0] - '0') * 10 + (d[1] - '0');
645 return 100; //invalid stream ID
649 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
651 AVIContext *avi = s->priv_data;
652 ByteIOContext *pb = s->pb;
658 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
659 int size = dv_get_packet(avi->dv_demux, pkt);
664 if(avi->non_interleaved){
665 int best_stream_index = 0;
666 AVStream *best_st= NULL;
668 int64_t best_ts= INT64_MAX;
671 for(i=0; i<s->nb_streams; i++){
672 AVStream *st = s->streams[i];
673 AVIStream *ast = st->priv_data;
674 int64_t ts= ast->frame_offset;
677 ts /= ast->sample_size;
678 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
680 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
681 if(ts < best_ts && st->nb_index_entries){
684 best_stream_index= i;
690 best_ast = best_st->priv_data;
691 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
692 if(best_ast->remaining)
693 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
695 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
697 best_ast->frame_offset= best_st->index_entries[i].timestamp
698 * FFMAX(1, best_ast->sample_size);
701 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
703 int64_t pos= best_st->index_entries[i].pos;
704 pos += best_ast->packet_size - best_ast->remaining;
705 url_fseek(s->pb, pos + 8, SEEK_SET);
706 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
708 assert(best_ast->remaining <= best_ast->packet_size);
710 avi->stream_index= best_stream_index;
711 if(!best_ast->remaining)
712 best_ast->packet_size=
713 best_ast->remaining= best_st->index_entries[i].size;
718 if(avi->stream_index >= 0){
719 AVStream *st= s->streams[ avi->stream_index ];
720 AVIStream *ast= st->priv_data;
723 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
725 else if(ast->sample_size < 32)
726 size= 64*ast->sample_size;
728 size= ast->sample_size;
730 if(size > ast->remaining)
731 size= ast->remaining;
732 avi->last_pkt_pos= url_ftell(pb);
733 err= av_get_packet(pb, pkt, size);
737 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
738 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
743 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
745 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
748 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
749 dstr = pkt->destruct;
750 size = dv_produce_packet(avi->dv_demux, pkt,
751 pkt->data, pkt->size);
752 pkt->destruct = dstr;
753 pkt->flags |= PKT_FLAG_KEY;
755 /* XXX: How to handle B-frames in AVI? */
756 pkt->dts = ast->frame_offset;
757 // pkt->dts += ast->start;
759 pkt->dts /= ast->sample_size;
760 //av_log(s, 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);
761 pkt->stream_index = avi->stream_index;
763 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
766 assert(st->index_entries);
768 index= av_index_search_timestamp(st, pkt->dts, 0);
769 e= &st->index_entries[index];
771 if(index >= 0 && e->timestamp == ast->frame_offset){
772 if (e->flags & AVINDEX_KEYFRAME)
773 pkt->flags |= PKT_FLAG_KEY;
776 pkt->flags |= PKT_FLAG_KEY;
779 ast->frame_offset += pkt->size;
783 ast->remaining -= size;
785 avi->stream_index= -1;
792 memset(d, -1, sizeof(int)*8);
793 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
800 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
802 n= get_stream_idx(d+2);
803 //av_log(s, 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);
804 if(i + (uint64_t)size > avi->fsize || d[0]<0)
808 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
810 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
811 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
813 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
817 n= get_stream_idx(d);
819 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
823 if(n < s->nb_streams){
829 if(s->nb_streams>=2){
830 AVStream *st1 = s->streams[1];
831 AVIStream *ast1= st1->priv_data;
832 //workaround for broken small-file-bug402.avi
833 if( d[2] == 'w' && d[3] == 'b'
835 && st ->codec->codec_type == CODEC_TYPE_VIDEO
836 && st1->codec->codec_type == CODEC_TYPE_AUDIO
837 && ast->prefix == 'd'*256+'c'
838 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
843 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
848 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
849 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
850 || st->discard >= AVDISCARD_ALL){
851 if(ast->sample_size) ast->frame_offset += pkt->size;
852 else ast->frame_offset++;
857 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
858 int k = get_byte(pb);
859 int last = (k + get_byte(pb) - 1) & 0xFF;
861 get_le16(pb); //flags
863 for (; k <= last; k++)
864 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
867 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
868 d[2]*256+d[3] == ast->prefix /*||
869 (d[2] == 'd' && d[3] == 'c') ||
870 (d[2] == 'w' && d[3] == 'b')*/) {
872 //av_log(s, AV_LOG_DEBUG, "OK\n");
873 if(d[2]*256+d[3] == ast->prefix)
876 ast->prefix= d[2]*256+d[3];
877 ast->prefix_count= 0;
880 avi->stream_index= n;
881 ast->packet_size= size + 8;
882 ast->remaining= size;
885 uint64_t pos= url_ftell(pb) - 8;
886 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
887 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
898 /* XXX: We make the implicit supposition that the positions are sorted
900 static int avi_read_idx1(AVFormatContext *s, int size)
902 AVIContext *avi = s->priv_data;
903 ByteIOContext *pb = s->pb;
904 int nb_index_entries, i;
907 unsigned int index, tag, flags, pos, len;
908 unsigned last_pos= -1;
910 nb_index_entries = size / 16;
911 if (nb_index_entries <= 0)
914 /* Read the entries and sort them in each stream component. */
915 for(i = 0; i < nb_index_entries; i++) {
917 flags = get_le32(pb);
920 #if defined(DEBUG_SEEK)
921 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
922 i, tag, flags, pos, len);
924 if(i==0 && pos > avi->movi_list)
925 avi->movi_list= 0; //FIXME better check
926 pos += avi->movi_list;
928 index = ((tag & 0xff) - '0') * 10;
929 index += ((tag >> 8) & 0xff) - '0';
930 if (index >= s->nb_streams)
932 st = s->streams[index];
935 #if defined(DEBUG_SEEK)
936 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
942 avi->non_interleaved= 1;
944 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
954 static int guess_ni_flag(AVFormatContext *s){
956 int64_t last_start=0;
957 int64_t first_end= INT64_MAX;
959 for(i=0; i<s->nb_streams; i++){
960 AVStream *st = s->streams[i];
961 int n= st->nb_index_entries;
966 if(st->index_entries[0].pos > last_start)
967 last_start= st->index_entries[0].pos;
968 if(st->index_entries[n-1].pos < first_end)
969 first_end= st->index_entries[n-1].pos;
971 return last_start > first_end;
974 static int avi_load_index(AVFormatContext *s)
976 AVIContext *avi = s->priv_data;
977 ByteIOContext *pb = s->pb;
979 int64_t pos= url_ftell(pb);
981 url_fseek(pb, avi->movi_end, SEEK_SET);
983 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
991 printf("tag=%c%c%c%c size=0x%x\n",
999 case MKTAG('i', 'd', 'x', '1'):
1000 if (avi_read_idx1(s, size) < 0)
1008 url_fskip(pb, size);
1013 url_fseek(pb, pos, SEEK_SET);
1017 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1019 AVIContext *avi = s->priv_data;
1024 if (!avi->index_loaded) {
1025 /* we only load the index on demand */
1027 avi->index_loaded = 1;
1029 assert(stream_index>= 0);
1031 st = s->streams[stream_index];
1032 index= av_index_search_timestamp(st, timestamp, flags);
1036 /* find the position */
1037 pos = st->index_entries[index].pos;
1038 timestamp = st->index_entries[index].timestamp;
1040 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1042 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1043 /* One and only one real stream for DV in AVI, and it has video */
1044 /* offsets. Calling with other stream indexes should have failed */
1045 /* the av_index_search_timestamp call above. */
1046 assert(stream_index == 0);
1048 /* Feed the DV video stream version of the timestamp to the */
1049 /* DV demux so it can synthesize correct timestamps. */
1050 dv_offset_reset(avi->dv_demux, timestamp);
1052 url_fseek(s->pb, pos, SEEK_SET);
1053 avi->stream_index= -1;
1057 for(i = 0; i < s->nb_streams; i++) {
1058 AVStream *st2 = s->streams[i];
1059 AVIStream *ast2 = st2->priv_data;
1064 if (st2->nb_index_entries <= 0)
1067 // assert(st2->codec->block_align);
1068 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1069 index = av_index_search_timestamp(
1071 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1072 flags | AVSEEK_FLAG_BACKWARD);
1076 if(!avi->non_interleaved){
1077 while(index>0 && st2->index_entries[index].pos > pos)
1079 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1083 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1084 /* extract the current frame number */
1085 ast2->frame_offset = st2->index_entries[index].timestamp;
1086 if(ast2->sample_size)
1087 ast2->frame_offset *=ast2->sample_size;
1091 url_fseek(s->pb, pos, SEEK_SET);
1092 avi->stream_index= -1;
1096 static int avi_read_close(AVFormatContext *s)
1099 AVIContext *avi = s->priv_data;
1101 for(i=0;i<s->nb_streams;i++) {
1102 AVStream *st = s->streams[i];
1103 av_free(st->codec->palctrl);
1107 av_free(avi->dv_demux);
1112 static int avi_probe(AVProbeData *p)
1116 /* check file header */
1117 for(i=0; avi_headers[i][0]; i++)
1118 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1119 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1120 return AVPROBE_SCORE_MAX;
1125 AVInputFormat avi_demuxer = {
1127 NULL_IF_CONFIG_SMALL("AVI format"),