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'
60 DVDemuxContext* dv_demux;
63 static const char avi_headers[][8] = {
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
66 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
67 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
68 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
72 static int avi_load_index(AVFormatContext *s);
73 static int guess_ni_flag(AVFormatContext *s);
76 static void print_tag(const char *str, unsigned int tag, int size)
78 printf("%s: tag=%c%c%c%c size=0x%x\n",
87 static int get_riff(AVIContext *avi, ByteIOContext *pb)
92 /* check RIFF header */
93 get_buffer(pb, header, 4);
94 avi->riff_end = get_le32(pb); /* RIFF chunk size */
95 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
96 get_buffer(pb, header+4, 4);
98 for(i=0; avi_headers[i][0]; i++)
99 if(!memcmp(header, avi_headers[i], 8))
101 if(!avi_headers[i][0])
104 if(header[7] == 0x19)
105 av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
110 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
111 AVIContext *avi = s->priv_data;
112 ByteIOContext *pb = s->pb;
113 int longs_pre_entry= get_le16(pb);
114 int index_sub_type = get_byte(pb);
115 int index_type = get_byte(pb);
116 int entries_in_use = get_le32(pb);
117 int chunk_id = get_le32(pb);
118 int64_t base = get_le64(pb);
119 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
123 int64_t last_pos= -1;
124 int64_t filesize= url_fsize(s->pb);
127 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
128 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
131 if(stream_id > s->nb_streams || stream_id < 0)
133 st= s->streams[stream_id];
141 if(index_type && longs_pre_entry != 2)
146 if(filesize > 0 && base >= filesize){
147 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
148 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
154 for(i=0; i<entries_in_use; i++){
156 int64_t pos= get_le32(pb) + base - 8;
157 int len = get_le32(pb);
162 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
164 if(last_pos == pos || pos == base - 8)
165 avi->non_interleaved= 1;
167 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
177 offset = get_le64(pb);
178 get_le32(pb); /* size */
179 duration = get_le32(pb);
182 url_fseek(pb, offset+8, SEEK_SET);
183 read_braindead_odml_indx(s, frame_num);
184 frame_num += duration;
186 url_fseek(pb, pos, SEEK_SET);
193 static void clean_index(AVFormatContext *s){
197 for(i=0; i<s->nb_streams; i++){
198 AVStream *st = s->streams[i];
199 AVIStream *ast = st->priv_data;
200 int n= st->nb_index_entries;
201 int max= ast->sample_size;
202 int64_t pos, size, ts;
204 if(n != 1 || ast->sample_size==0)
207 while(max < 1024) max+=max;
209 pos= st->index_entries[0].pos;
210 size= st->index_entries[0].size;
211 ts= st->index_entries[0].timestamp;
213 for(j=0; j<size; j+=max){
214 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
219 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
221 int64_t i = url_ftell(pb);
223 get_strz(pb, buf, maxlen);
224 url_fseek(pb, i+size, SEEK_SET);
228 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
230 AVIContext *avi = s->priv_data;
231 ByteIOContext *pb = s->pb;
232 uint32_t tag, tag1, handler;
233 int codec_type, stream_index, frame_period, bit_rate;
234 unsigned int size, nb_frames;
237 AVIStream *ast = NULL;
239 int avih_width=0, avih_height=0;
240 int amv_file_format=0;
242 avi->stream_index= -1;
244 if (get_riff(avi, pb) < 0)
247 avi->fsize = url_fsize(pb);
249 avi->fsize= avi->riff_end;
261 print_tag("tag", tag, size);
265 case MKTAG('L', 'I', 'S', 'T'):
266 /* Ignored, except at start of video packets. */
269 print_tag("list", tag1, 0);
271 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
272 avi->movi_list = url_ftell(pb) - 4;
273 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
274 else avi->movi_end = url_fsize(pb);
276 printf("movi end=%"PRIx64"\n", avi->movi_end);
281 case MKTAG('d', 'm', 'l', 'h'):
283 url_fskip(pb, size + (size & 1));
285 case MKTAG('a', 'm', 'v', 'h'):
287 case MKTAG('a', 'v', 'i', 'h'):
289 /* using frame_period is bad idea */
290 frame_period = get_le32(pb);
291 bit_rate = get_le32(pb) * 8;
293 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
295 url_fskip(pb, 2 * 4);
298 avih_width=get_le32(pb);
299 avih_height=get_le32(pb);
301 url_fskip(pb, size - 10 * 4);
303 case MKTAG('s', 't', 'r', 'h'):
307 handler = get_le32(pb); /* codec tag */
309 if(tag1 == MKTAG('p', 'a', 'd', 's')){
310 url_fskip(pb, size - 8);
314 st = av_new_stream(s, stream_index);
318 ast = av_mallocz(sizeof(AVIStream));
324 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
327 print_tag("strh", tag1, -1);
329 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
333 * After some consideration -- I don't think we
334 * have to support anything but DV in type1 AVIs.
336 if (s->nb_streams != 1)
339 if (handler != MKTAG('d', 'v', 's', 'd') &&
340 handler != MKTAG('d', 'v', 'h', 'd') &&
341 handler != MKTAG('d', 'v', 's', 'l'))
344 ast = s->streams[0]->priv_data;
345 av_freep(&s->streams[0]->codec->extradata);
346 av_freep(&s->streams[0]);
348 if (ENABLE_DV_DEMUXER) {
349 avi->dv_demux = dv_init_demux(s);
353 s->streams[0]->priv_data = ast;
354 url_fskip(pb, 3 * 4);
355 ast->scale = get_le32(pb);
356 ast->rate = get_le32(pb);
357 url_fskip(pb, 4); /* start time */
359 dv_dur = get_le32(pb);
360 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
361 dv_dur *= AV_TIME_BASE;
362 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
365 * else, leave duration alone; timing estimation in utils.c
366 * will make a guess based on bitrate.
369 stream_index = s->nb_streams - 1;
370 url_fskip(pb, size - 9*4);
374 assert(stream_index < s->nb_streams);
375 st->codec->stream_codec_tag= handler;
377 get_le32(pb); /* flags */
378 get_le16(pb); /* priority */
379 get_le16(pb); /* language */
380 get_le32(pb); /* initial frame */
381 ast->scale = get_le32(pb);
382 ast->rate = get_le32(pb);
383 if(!(ast->scale && ast->rate)){
384 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);
387 ast->scale = frame_period;
393 av_set_pts_info(st, 64, ast->scale, ast->rate);
395 ast->cum_len=get_le32(pb); /* start */
396 nb_frames = get_le32(pb);
399 st->duration = nb_frames;
400 get_le32(pb); /* buffer size */
401 get_le32(pb); /* quality */
402 ast->sample_size = get_le32(pb); /* sample ssize */
403 ast->cum_len *= FFMAX(1, ast->sample_size);
404 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
407 case MKTAG('v', 'i', 'd', 's'):
408 codec_type = CODEC_TYPE_VIDEO;
410 ast->sample_size = 0;
412 case MKTAG('a', 'u', 'd', 's'):
413 codec_type = CODEC_TYPE_AUDIO;
415 case MKTAG('t', 'x', 't', 's'):
417 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
419 case MKTAG('d', 'a', 't', 's'):
420 codec_type = CODEC_TYPE_DATA;
423 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
426 ast->frame_offset= ast->cum_len;
427 url_fskip(pb, size - 12 * 4);
429 case MKTAG('s', 't', 'r', 'f'):
431 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
434 st = s->streams[stream_index];
436 case CODEC_TYPE_VIDEO:
438 st->codec->width=avih_width;
439 st->codec->height=avih_height;
440 st->codec->codec_type = CODEC_TYPE_VIDEO;
441 st->codec->codec_id = CODEC_ID_AMV;
445 get_le32(pb); /* size */
446 st->codec->width = get_le32(pb);
447 st->codec->height = get_le32(pb);
448 get_le16(pb); /* panes */
449 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
451 get_le32(pb); /* ImageSize */
452 get_le32(pb); /* XPelsPerMeter */
453 get_le32(pb); /* YPelsPerMeter */
454 get_le32(pb); /* ClrUsed */
455 get_le32(pb); /* ClrImportant */
457 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
458 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
459 st->codec->codec_tag = tag1;
460 st->codec->codec_id = CODEC_ID_XSUB;
464 if(size > 10*4 && size<(1<<30)){
465 st->codec->extradata_size= size - 10*4;
466 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
467 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
470 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
473 /* Extract palette from extradata if bpp <= 8. */
474 /* This code assumes that extradata contains only palette. */
475 /* This is true for all paletted codecs implemented in FFmpeg. */
476 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
477 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
478 #ifdef WORDS_BIGENDIAN
479 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
480 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
482 memcpy(st->codec->palctrl->palette, st->codec->extradata,
483 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
485 st->codec->palctrl->palette_changed = 1;
489 print_tag("video", tag1, 0);
491 st->codec->codec_type = CODEC_TYPE_VIDEO;
492 st->codec->codec_tag = tag1;
493 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
494 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
495 // url_fskip(pb, size - 5 * 4);
497 case CODEC_TYPE_AUDIO:
498 get_wav_header(pb, st->codec, size);
499 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
500 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
501 ast->sample_size= st->codec->block_align;
503 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
505 /* Force parsing as several audio frames can be in
506 * one packet and timestamps refer to packet start. */
507 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
508 /* ADTS header is in extradata, AAC without header must be
509 * stored as exact frames. Parser not needed and it will
511 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
512 st->need_parsing = AVSTREAM_PARSE_NONE;
513 /* AVI files with Xan DPCM audio (wrongly) declare PCM
514 * audio in the header but have Axan as stream_code_tag. */
515 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
516 st->codec->codec_id = CODEC_ID_XAN_DPCM;
517 st->codec->codec_tag = 0;
520 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
523 st->codec->codec_type = CODEC_TYPE_DATA;
524 st->codec->codec_id= CODEC_ID_NONE;
525 st->codec->codec_tag= 0;
531 case MKTAG('i', 'n', 'd', 'x'):
533 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
534 read_braindead_odml_indx(s, 0);
536 url_fseek(pb, i+size, SEEK_SET);
538 case MKTAG('v', 'p', 'r', 'p'):
539 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
540 AVRational active, active_aspect;
542 st = s->streams[stream_index];
549 active_aspect.den= get_le16(pb);
550 active_aspect.num= get_le16(pb);
551 active.num = get_le32(pb);
552 active.den = get_le32(pb);
553 get_le32(pb); //nbFieldsPerFrame
555 if(active_aspect.num && active_aspect.den && active.num && active.den){
556 st->sample_aspect_ratio= av_div_q(active_aspect, active);
557 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
561 url_fseek(pb, size, SEEK_CUR);
563 case MKTAG('I', 'N', 'A', 'M'):
564 avi_read_tag(pb, s->title, sizeof(s->title), size);
566 case MKTAG('I', 'A', 'R', 'T'):
567 avi_read_tag(pb, s->author, sizeof(s->author), size);
569 case MKTAG('I', 'C', 'O', 'P'):
570 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
572 case MKTAG('I', 'C', 'M', 'T'):
573 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
575 case MKTAG('I', 'G', 'N', 'R'):
576 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
578 case MKTAG('I', 'P', 'R', 'D'):
579 avi_read_tag(pb, s->album, sizeof(s->album), size);
581 case MKTAG('I', 'P', 'R', 'T'):
582 avi_read_tag(pb, str_track, sizeof(str_track), size);
583 sscanf(str_track, "%d", &s->track);
587 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
588 "I will ignore it and try to continue anyway.\n");
589 avi->movi_list = url_ftell(pb) - 4;
590 avi->movi_end = url_fsize(pb);
600 /* check stream number */
601 if (stream_index != s->nb_streams - 1) {
606 if(!avi->index_loaded && !url_is_streamed(pb))
608 avi->index_loaded = 1;
609 avi->non_interleaved |= guess_ni_flag(s);
610 if(avi->non_interleaved) {
611 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
618 static int get_stream_idx(int *d){
619 if( d[0] >= '0' && d[0] <= '9'
620 && d[1] >= '0' && d[1] <= '9'){
621 return (d[0] - '0') * 10 + (d[1] - '0');
623 return 100; //invalid stream ID
627 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
629 AVIContext *avi = s->priv_data;
630 ByteIOContext *pb = s->pb;
635 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
636 size = dv_get_packet(avi->dv_demux, pkt);
641 if(avi->non_interleaved){
642 int best_stream_index = 0;
643 AVStream *best_st= NULL;
645 int64_t best_ts= INT64_MAX;
648 for(i=0; i<s->nb_streams; i++){
649 AVStream *st = s->streams[i];
650 AVIStream *ast = st->priv_data;
651 int64_t ts= ast->frame_offset;
654 ts /= ast->sample_size;
655 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
657 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
658 if(ts < best_ts && st->nb_index_entries){
661 best_stream_index= i;
667 best_ast = best_st->priv_data;
668 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
669 if(best_ast->remaining)
670 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
672 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
674 best_ast->frame_offset= best_st->index_entries[i].timestamp
675 * FFMAX(1, best_ast->sample_size);
678 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
680 int64_t pos= best_st->index_entries[i].pos;
681 pos += best_ast->packet_size - best_ast->remaining;
682 url_fseek(s->pb, pos + 8, SEEK_SET);
683 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
685 assert(best_ast->remaining <= best_ast->packet_size);
687 avi->stream_index= best_stream_index;
688 if(!best_ast->remaining)
689 best_ast->packet_size=
690 best_ast->remaining= best_st->index_entries[i].size;
695 if(avi->stream_index >= 0){
696 AVStream *st= s->streams[ avi->stream_index ];
697 AVIStream *ast= st->priv_data;
700 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
702 else if(ast->sample_size < 32)
703 size= 64*ast->sample_size;
705 size= ast->sample_size;
707 if(size > ast->remaining)
708 size= ast->remaining;
709 avi->last_pkt_pos= url_ftell(pb);
710 av_get_packet(pb, pkt, size);
712 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
715 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
717 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
720 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
721 dstr = pkt->destruct;
722 size = dv_produce_packet(avi->dv_demux, pkt,
723 pkt->data, pkt->size);
724 pkt->destruct = dstr;
725 pkt->flags |= PKT_FLAG_KEY;
727 /* XXX: How to handle B-frames in AVI? */
728 pkt->dts = ast->frame_offset;
729 // pkt->dts += ast->start;
731 pkt->dts /= ast->sample_size;
732 //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);
733 pkt->stream_index = avi->stream_index;
735 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
738 assert(st->index_entries);
740 index= av_index_search_timestamp(st, pkt->dts, 0);
741 e= &st->index_entries[index];
743 if(index >= 0 && e->timestamp == ast->frame_offset){
744 if (e->flags & AVINDEX_KEYFRAME)
745 pkt->flags |= PKT_FLAG_KEY;
748 pkt->flags |= PKT_FLAG_KEY;
751 ast->frame_offset += pkt->size;
755 ast->remaining -= size;
757 avi->stream_index= -1;
764 memset(d, -1, sizeof(int)*8);
765 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
772 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
774 n= get_stream_idx(d+2);
775 //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);
776 if(i + size > avi->fsize || d[0]<0)
780 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
782 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
783 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
785 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
789 n= get_stream_idx(d);
791 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
795 if(n < s->nb_streams){
801 if(s->nb_streams>=2){
802 AVStream *st1 = s->streams[1];
803 AVIStream *ast1= st1->priv_data;
804 //workaround for broken small-file-bug402.avi
805 if( d[2] == 'w' && d[3] == 'b'
807 && st ->codec->codec_type == CODEC_TYPE_VIDEO
808 && st1->codec->codec_type == CODEC_TYPE_AUDIO
809 && ast->prefix == 'd'*256+'c'
810 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
815 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
820 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
821 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
822 || st->discard >= AVDISCARD_ALL){
823 if(ast->sample_size) ast->frame_offset += pkt->size;
824 else ast->frame_offset++;
829 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
830 int k = get_byte(pb);
831 int last = (k + get_byte(pb) - 1) & 0xFF;
833 get_le16(pb); //flags
835 for (; k <= last; k++)
836 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
839 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
840 d[2]*256+d[3] == ast->prefix /*||
841 (d[2] == 'd' && d[3] == 'c') ||
842 (d[2] == 'w' && d[3] == 'b')*/) {
844 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
845 if(d[2]*256+d[3] == ast->prefix)
848 ast->prefix= d[2]*256+d[3];
849 ast->prefix_count= 0;
852 avi->stream_index= n;
853 ast->packet_size= size + 8;
854 ast->remaining= size;
857 uint64_t pos= url_ftell(pb) - 8;
858 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
859 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
870 /* XXX: We make the implicit supposition that the positions are sorted
872 static int avi_read_idx1(AVFormatContext *s, int size)
874 AVIContext *avi = s->priv_data;
875 ByteIOContext *pb = s->pb;
876 int nb_index_entries, i;
879 unsigned int index, tag, flags, pos, len;
880 unsigned last_pos= -1;
882 nb_index_entries = size / 16;
883 if (nb_index_entries <= 0)
886 /* Read the entries and sort them in each stream component. */
887 for(i = 0; i < nb_index_entries; i++) {
889 flags = get_le32(pb);
892 #if defined(DEBUG_SEEK)
893 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
894 i, tag, flags, pos, len);
896 if(i==0 && pos > avi->movi_list)
897 avi->movi_list= 0; //FIXME better check
898 pos += avi->movi_list;
900 index = ((tag & 0xff) - '0') * 10;
901 index += ((tag >> 8) & 0xff) - '0';
902 if (index >= s->nb_streams)
904 st = s->streams[index];
907 #if defined(DEBUG_SEEK)
908 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
911 avi->non_interleaved= 1;
913 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
923 static int guess_ni_flag(AVFormatContext *s){
925 int64_t last_start=0;
926 int64_t first_end= INT64_MAX;
928 for(i=0; i<s->nb_streams; i++){
929 AVStream *st = s->streams[i];
930 int n= st->nb_index_entries;
935 if(st->index_entries[0].pos > last_start)
936 last_start= st->index_entries[0].pos;
937 if(st->index_entries[n-1].pos < first_end)
938 first_end= st->index_entries[n-1].pos;
940 return last_start > first_end;
943 static int avi_load_index(AVFormatContext *s)
945 AVIContext *avi = s->priv_data;
946 ByteIOContext *pb = s->pb;
948 int64_t pos= url_ftell(pb);
950 url_fseek(pb, avi->movi_end, SEEK_SET);
952 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
960 printf("tag=%c%c%c%c size=0x%x\n",
968 case MKTAG('i', 'd', 'x', '1'):
969 if (avi_read_idx1(s, size) < 0)
982 url_fseek(pb, pos, SEEK_SET);
986 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
988 AVIContext *avi = s->priv_data;
993 if (!avi->index_loaded) {
994 /* we only load the index on demand */
996 avi->index_loaded = 1;
998 assert(stream_index>= 0);
1000 st = s->streams[stream_index];
1001 index= av_index_search_timestamp(st, timestamp, flags);
1005 /* find the position */
1006 pos = st->index_entries[index].pos;
1007 timestamp = st->index_entries[index].timestamp;
1009 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1011 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
1012 /* One and only one real stream for DV in AVI, and it has video */
1013 /* offsets. Calling with other stream indexes should have failed */
1014 /* the av_index_search_timestamp call above. */
1015 assert(stream_index == 0);
1017 /* Feed the DV video stream version of the timestamp to the */
1018 /* DV demux so it can synthesize correct timestamps. */
1019 dv_offset_reset(avi->dv_demux, timestamp);
1021 url_fseek(s->pb, pos, SEEK_SET);
1022 avi->stream_index= -1;
1026 for(i = 0; i < s->nb_streams; i++) {
1027 AVStream *st2 = s->streams[i];
1028 AVIStream *ast2 = st2->priv_data;
1033 if (st2->nb_index_entries <= 0)
1036 // assert(st2->codec->block_align);
1037 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1038 index = av_index_search_timestamp(
1040 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1041 flags | AVSEEK_FLAG_BACKWARD);
1045 if(!avi->non_interleaved){
1046 while(index>0 && st2->index_entries[index].pos > pos)
1048 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1052 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1053 /* extract the current frame number */
1054 ast2->frame_offset = st2->index_entries[index].timestamp;
1055 if(ast2->sample_size)
1056 ast2->frame_offset *=ast2->sample_size;
1060 url_fseek(s->pb, pos, SEEK_SET);
1061 avi->stream_index= -1;
1065 static int avi_read_close(AVFormatContext *s)
1068 AVIContext *avi = s->priv_data;
1070 for(i=0;i<s->nb_streams;i++) {
1071 AVStream *st = s->streams[i];
1072 av_free(st->codec->palctrl);
1076 av_free(avi->dv_demux);
1081 static int avi_probe(AVProbeData *p)
1085 /* check file header */
1086 for(i=0; avi_headers[i][0]; i++)
1087 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1088 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1089 return AVPROBE_SCORE_MAX;
1094 AVInputFormat avi_demuxer = {
1096 NULL_IF_CONFIG_SMALL("AVI format"),