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'
59 DVDemuxContext* dv_demux;
62 static const char avi_headers[][8] = {
63 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
66 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
67 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
71 static int avi_load_index(AVFormatContext *s);
72 static int guess_ni_flag(AVFormatContext *s);
75 static void print_tag(const char *str, unsigned int tag, int size)
77 printf("%s: tag=%c%c%c%c size=0x%x\n",
86 static int get_riff(AVIContext *avi, ByteIOContext *pb)
91 /* check RIFF header */
92 get_buffer(pb, header, 4);
93 avi->riff_end = get_le32(pb); /* RIFF chunk size */
94 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
95 get_buffer(pb, header+4, 4);
97 for(i=0; avi_headers[i][0]; i++)
98 if(!memcmp(header, avi_headers[i], 8))
100 if(!avi_headers[i][0])
103 if(header[7] == 0x19)
104 av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
109 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
110 AVIContext *avi = s->priv_data;
111 ByteIOContext *pb = s->pb;
112 int longs_pre_entry= get_le16(pb);
113 int index_sub_type = get_byte(pb);
114 int index_type = get_byte(pb);
115 int entries_in_use = get_le32(pb);
116 int chunk_id = get_le32(pb);
117 int64_t base = get_le64(pb);
118 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
122 int64_t last_pos= -1;
123 int64_t filesize= url_fsize(s->pb);
126 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
127 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
130 if(stream_id > s->nb_streams || stream_id < 0)
132 st= s->streams[stream_id];
140 if(index_type && longs_pre_entry != 2)
145 if(filesize > 0 && base >= filesize){
146 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
147 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
153 for(i=0; i<entries_in_use; i++){
155 int64_t pos= get_le32(pb) + base - 8;
156 int len = get_le32(pb);
161 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
163 if(last_pos == pos || pos == base - 8)
164 avi->non_interleaved= 1;
166 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
176 offset = get_le64(pb);
177 get_le32(pb); /* size */
178 duration = get_le32(pb);
181 url_fseek(pb, offset+8, SEEK_SET);
182 read_braindead_odml_indx(s, frame_num);
183 frame_num += duration;
185 url_fseek(pb, pos, SEEK_SET);
192 static void clean_index(AVFormatContext *s){
196 for(i=0; i<s->nb_streams; i++){
197 AVStream *st = s->streams[i];
198 AVIStream *ast = st->priv_data;
199 int n= st->nb_index_entries;
200 int max= ast->sample_size;
201 int64_t pos, size, ts;
203 if(n != 1 || ast->sample_size==0)
206 while(max < 1024) max+=max;
208 pos= st->index_entries[0].pos;
209 size= st->index_entries[0].size;
210 ts= st->index_entries[0].timestamp;
212 for(j=0; j<size; j+=max){
213 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
218 static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
220 offset_t i = url_ftell(pb);
222 get_strz(pb, buf, maxlen);
223 url_fseek(pb, i+size, SEEK_SET);
227 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
229 AVIContext *avi = s->priv_data;
230 ByteIOContext *pb = s->pb;
231 uint32_t tag, tag1, handler;
232 int codec_type, stream_index, frame_period, bit_rate;
233 unsigned int size, nb_frames;
236 AVIStream *ast = NULL;
238 int avih_width=0, avih_height=0;
239 int amv_file_format=0;
241 avi->stream_index= -1;
243 if (get_riff(avi, pb) < 0)
246 avi->fsize = url_fsize(pb);
248 avi->fsize= avi->riff_end;
260 print_tag("tag", tag, size);
264 case MKTAG('L', 'I', 'S', 'T'):
265 /* ignored, except when start of video packets */
268 print_tag("list", tag1, 0);
270 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
271 avi->movi_list = url_ftell(pb) - 4;
272 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
273 else avi->movi_end = url_fsize(pb);
275 printf("movi end=%"PRIx64"\n", avi->movi_end);
280 case MKTAG('d', 'm', 'l', 'h'):
282 url_fskip(pb, size + (size & 1));
284 case MKTAG('a', 'm', 'v', 'h'):
286 case MKTAG('a', 'v', 'i', 'h'):
288 /* using frame_period is bad idea */
289 frame_period = get_le32(pb);
290 bit_rate = get_le32(pb) * 8;
292 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
294 url_fskip(pb, 2 * 4);
297 avih_width=get_le32(pb);
298 avih_height=get_le32(pb);
300 url_fskip(pb, size - 10 * 4);
302 case MKTAG('s', 't', 'r', 'h'):
306 handler = get_le32(pb); /* codec tag */
308 if(tag1 == MKTAG('p', 'a', 'd', 's')){
309 url_fskip(pb, size - 8);
313 st = av_new_stream(s, stream_index);
317 ast = av_mallocz(sizeof(AVIStream));
323 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
326 print_tag("strh", tag1, -1);
328 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
332 * After some consideration -- I don't think we
333 * have to support anything but DV in a type1 AVIs.
335 if (s->nb_streams != 1)
338 if (handler != MKTAG('d', 'v', 's', 'd') &&
339 handler != MKTAG('d', 'v', 'h', 'd') &&
340 handler != MKTAG('d', 'v', 's', 'l'))
343 ast = s->streams[0]->priv_data;
344 av_freep(&s->streams[0]->codec->extradata);
345 av_freep(&s->streams[0]);
347 if (ENABLE_DV_DEMUXER) {
348 avi->dv_demux = dv_init_demux(s);
352 s->streams[0]->priv_data = ast;
353 url_fskip(pb, 3 * 4);
354 ast->scale = get_le32(pb);
355 ast->rate = get_le32(pb);
356 url_fskip(pb, 4); /* start time */
358 dv_dur = get_le32(pb);
359 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
360 dv_dur *= AV_TIME_BASE;
361 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
364 * else, leave duration alone; timing estimation in utils.c
365 * will make a guess based on bit rate.
368 stream_index = s->nb_streams - 1;
369 url_fskip(pb, size - 9*4);
373 assert(stream_index < s->nb_streams);
374 st->codec->stream_codec_tag= handler;
376 get_le32(pb); /* flags */
377 get_le16(pb); /* priority */
378 get_le16(pb); /* language */
379 get_le32(pb); /* initial frame */
380 ast->scale = get_le32(pb);
381 ast->rate = get_le32(pb);
382 if(!(ast->scale && ast->rate)){
385 ast->scale = frame_period;
391 av_set_pts_info(st, 64, ast->scale, ast->rate);
393 ast->cum_len=get_le32(pb); /* start */
394 nb_frames = get_le32(pb);
397 st->duration = nb_frames;
398 get_le32(pb); /* buffer size */
399 get_le32(pb); /* quality */
400 ast->sample_size = get_le32(pb); /* sample ssize */
401 ast->cum_len *= FFMAX(1, ast->sample_size);
402 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
405 case MKTAG('v', 'i', 'd', 's'):
406 codec_type = CODEC_TYPE_VIDEO;
408 ast->sample_size = 0;
410 case MKTAG('a', 'u', 'd', 's'):
411 codec_type = CODEC_TYPE_AUDIO;
413 case MKTAG('t', 'x', 't', 's'):
415 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
418 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
421 ast->frame_offset= ast->cum_len;
422 url_fskip(pb, size - 12 * 4);
424 case MKTAG('s', 't', 'r', 'f'):
426 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
429 st = s->streams[stream_index];
431 case CODEC_TYPE_VIDEO:
433 st->codec->width=avih_width;
434 st->codec->height=avih_height;
435 st->codec->codec_type = CODEC_TYPE_VIDEO;
436 st->codec->codec_id = CODEC_ID_AMV;
440 get_le32(pb); /* size */
441 st->codec->width = get_le32(pb);
442 st->codec->height = get_le32(pb);
443 get_le16(pb); /* panes */
444 st->codec->bits_per_sample= get_le16(pb); /* depth */
446 get_le32(pb); /* ImageSize */
447 get_le32(pb); /* XPelsPerMeter */
448 get_le32(pb); /* YPelsPerMeter */
449 get_le32(pb); /* ClrUsed */
450 get_le32(pb); /* ClrImportant */
452 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
453 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
454 st->codec->codec_tag = tag1;
455 st->codec->codec_id = CODEC_ID_XSUB;
459 if(size > 10*4 && size<(1<<30)){
460 st->codec->extradata_size= size - 10*4;
461 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
462 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
465 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
468 /* Extract palette from extradata if bpp <= 8 */
469 /* This code assumes that extradata contains only palette */
470 /* This is true for all paletted codecs implemented in ffmpeg */
471 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
472 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
473 #ifdef WORDS_BIGENDIAN
474 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
475 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
477 memcpy(st->codec->palctrl->palette, st->codec->extradata,
478 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
480 st->codec->palctrl->palette_changed = 1;
484 print_tag("video", tag1, 0);
486 st->codec->codec_type = CODEC_TYPE_VIDEO;
487 st->codec->codec_tag = tag1;
488 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
489 st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
490 // url_fskip(pb, size - 5 * 4);
492 case CODEC_TYPE_AUDIO:
493 get_wav_header(pb, st->codec, size);
494 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
495 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
496 ast->sample_size= st->codec->block_align;
498 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
500 /* Force parsing as several audio frames can be in
501 * one packet and timestamps refer to packet start*/
502 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
503 /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
504 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
505 st->need_parsing = AVSTREAM_PARSE_NONE;
506 /* AVI files with Xan DPCM audio (wrongly) declare PCM
507 * audio in the header but have Axan as stream_code_tag. */
508 if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
509 st->codec->codec_id = CODEC_ID_XAN_DPCM;
510 st->codec->codec_tag = 0;
513 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
516 st->codec->codec_type = CODEC_TYPE_DATA;
517 st->codec->codec_id= CODEC_ID_NONE;
518 st->codec->codec_tag= 0;
524 case MKTAG('i', 'n', 'd', 'x'):
526 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
527 read_braindead_odml_indx(s, 0);
529 url_fseek(pb, i+size, SEEK_SET);
531 case MKTAG('v', 'p', 'r', 'p'):
532 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
533 AVRational active, active_aspect;
535 st = s->streams[stream_index];
542 active_aspect.den= get_le16(pb);
543 active_aspect.num= get_le16(pb);
544 active.num = get_le32(pb);
545 active.den = get_le32(pb);
546 get_le32(pb); //nbFieldsPerFrame
548 if(active_aspect.num && active_aspect.den && active.num && active.den){
549 st->codec->sample_aspect_ratio= av_div_q(active_aspect, active);
550 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
554 url_fseek(pb, size, SEEK_CUR);
556 case MKTAG('I', 'N', 'A', 'M'):
557 avi_read_tag(pb, s->title, sizeof(s->title), size);
559 case MKTAG('I', 'A', 'R', 'T'):
560 avi_read_tag(pb, s->author, sizeof(s->author), size);
562 case MKTAG('I', 'C', 'O', 'P'):
563 avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
565 case MKTAG('I', 'C', 'M', 'T'):
566 avi_read_tag(pb, s->comment, sizeof(s->comment), size);
568 case MKTAG('I', 'G', 'N', 'R'):
569 avi_read_tag(pb, s->genre, sizeof(s->genre), size);
571 case MKTAG('I', 'P', 'R', 'D'):
572 avi_read_tag(pb, s->album, sizeof(s->album), size);
574 case MKTAG('I', 'P', 'R', 'T'):
575 avi_read_tag(pb, str_track, sizeof(str_track), size);
576 sscanf(str_track, "%d", &s->track);
580 av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
581 "ill ignore it and try to continue anyway\n");
582 avi->movi_list = url_ftell(pb) - 4;
583 avi->movi_end = url_fsize(pb);
593 /* check stream number */
594 if (stream_index != s->nb_streams - 1) {
596 for(i=0;i<s->nb_streams;i++) {
597 av_freep(&s->streams[i]->codec->extradata);
598 av_freep(&s->streams[i]);
603 if(!avi->index_loaded && !url_is_streamed(pb))
605 avi->index_loaded = 1;
606 avi->non_interleaved |= guess_ni_flag(s);
607 if(avi->non_interleaved)
613 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
615 AVIContext *avi = s->priv_data;
616 ByteIOContext *pb = s->pb;
621 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
622 size = dv_get_packet(avi->dv_demux, pkt);
627 if(avi->non_interleaved){
628 int best_stream_index = 0;
629 AVStream *best_st= NULL;
631 int64_t best_ts= INT64_MAX;
634 for(i=0; i<s->nb_streams; i++){
635 AVStream *st = s->streams[i];
636 AVIStream *ast = st->priv_data;
637 int64_t ts= ast->frame_offset;
640 ts /= ast->sample_size;
641 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
643 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
647 best_stream_index= i;
650 best_ast = best_st->priv_data;
651 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
652 if(best_ast->remaining)
653 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
655 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
657 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
659 int64_t pos= best_st->index_entries[i].pos;
660 pos += best_ast->packet_size - best_ast->remaining;
661 url_fseek(s->pb, pos + 8, SEEK_SET);
662 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
664 assert(best_ast->remaining <= best_ast->packet_size);
666 avi->stream_index= best_stream_index;
667 if(!best_ast->remaining)
668 best_ast->packet_size=
669 best_ast->remaining= best_st->index_entries[i].size;
674 if(avi->stream_index >= 0){
675 AVStream *st= s->streams[ avi->stream_index ];
676 AVIStream *ast= st->priv_data;
679 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
681 else if(ast->sample_size < 32)
682 size= 64*ast->sample_size;
684 size= ast->sample_size;
686 if(size > ast->remaining)
687 size= ast->remaining;
688 av_get_packet(pb, pkt, size);
690 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
693 pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
695 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
698 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
699 dstr = pkt->destruct;
700 size = dv_produce_packet(avi->dv_demux, pkt,
701 pkt->data, pkt->size);
702 pkt->destruct = dstr;
703 pkt->flags |= PKT_FLAG_KEY;
705 /* XXX: how to handle B frames in avi ? */
706 pkt->dts = ast->frame_offset;
707 // pkt->dts += ast->start;
709 pkt->dts /= ast->sample_size;
710 //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);
711 pkt->stream_index = avi->stream_index;
713 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
716 assert(st->index_entries);
718 index= av_index_search_timestamp(st, pkt->dts, 0);
719 e= &st->index_entries[index];
721 if(index >= 0 && e->timestamp == ast->frame_offset){
722 if (e->flags & AVINDEX_KEYFRAME)
723 pkt->flags |= PKT_FLAG_KEY;
726 pkt->flags |= PKT_FLAG_KEY;
729 ast->frame_offset += pkt->size;
733 ast->remaining -= size;
735 avi->stream_index= -1;
742 memset(d, -1, sizeof(int)*8);
743 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
750 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
752 if( d[2] >= '0' && d[2] <= '9'
753 && d[3] >= '0' && d[3] <= '9'){
754 n= (d[2] - '0') * 10 + (d[3] - '0');
756 n= 100; //invalid stream id
758 //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);
759 if(i + size > avi->fsize || d[0]<0)
763 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
765 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
766 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
768 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
772 if( d[0] >= '0' && d[0] <= '9'
773 && d[1] >= '0' && d[1] <= '9'){
774 n= (d[0] - '0') * 10 + (d[1] - '0');
776 n= 100; //invalid stream id
780 if(n < s->nb_streams){
786 if(s->nb_streams>=2){
787 AVStream *st1 = s->streams[1];
788 AVIStream *ast1= st1->priv_data;
789 //workaround for broken small-file-bug402.avi
790 if( d[2] == 'w' && d[3] == 'b'
792 && st ->codec->codec_type == CODEC_TYPE_VIDEO
793 && st1->codec->codec_type == CODEC_TYPE_AUDIO
794 && ast->prefix == 'd'*256+'c'
795 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
800 av_log(s, AV_LOG_WARNING, "Invalid stream+prefix combination, assuming audio\n");
805 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
806 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
807 || st->discard >= AVDISCARD_ALL){
808 if(ast->sample_size) ast->frame_offset += pkt->size;
809 else ast->frame_offset++;
814 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
815 int k = get_byte(pb);
816 int last = (k + get_byte(pb) - 1) & 0xFF;
818 get_le16(pb); //flags
820 for (; k <= last; k++)
821 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
824 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
825 d[2]*256+d[3] == ast->prefix /*||
826 (d[2] == 'd' && d[3] == 'c') ||
827 (d[2] == 'w' && d[3] == 'b')*/) {
829 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
830 if(d[2]*256+d[3] == ast->prefix)
833 ast->prefix= d[2]*256+d[3];
834 ast->prefix_count= 0;
837 avi->stream_index= n;
838 ast->packet_size= size + 8;
839 ast->remaining= size;
842 uint64_t pos= url_ftell(pb) - 8;
843 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
844 av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
855 /* XXX: we make the implicit supposition that the position are sorted
857 static int avi_read_idx1(AVFormatContext *s, int size)
859 AVIContext *avi = s->priv_data;
860 ByteIOContext *pb = s->pb;
861 int nb_index_entries, i;
864 unsigned int index, tag, flags, pos, len;
865 unsigned last_pos= -1;
867 nb_index_entries = size / 16;
868 if (nb_index_entries <= 0)
871 /* read the entries and sort them in each stream component */
872 for(i = 0; i < nb_index_entries; i++) {
874 flags = get_le32(pb);
877 #if defined(DEBUG_SEEK)
878 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
879 i, tag, flags, pos, len);
881 if(i==0 && pos > avi->movi_list)
882 avi->movi_list= 0; //FIXME better check
883 pos += avi->movi_list;
885 index = ((tag & 0xff) - '0') * 10;
886 index += ((tag >> 8) & 0xff) - '0';
887 if (index >= s->nb_streams)
889 st = s->streams[index];
892 #if defined(DEBUG_SEEK)
893 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
896 avi->non_interleaved= 1;
898 av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
908 static int guess_ni_flag(AVFormatContext *s){
910 int64_t last_start=0;
911 int64_t first_end= INT64_MAX;
913 for(i=0; i<s->nb_streams; i++){
914 AVStream *st = s->streams[i];
915 int n= st->nb_index_entries;
920 if(st->index_entries[0].pos > last_start)
921 last_start= st->index_entries[0].pos;
922 if(st->index_entries[n-1].pos < first_end)
923 first_end= st->index_entries[n-1].pos;
925 return last_start > first_end;
928 static int avi_load_index(AVFormatContext *s)
930 AVIContext *avi = s->priv_data;
931 ByteIOContext *pb = s->pb;
933 offset_t pos= url_ftell(pb);
935 url_fseek(pb, avi->movi_end, SEEK_SET);
937 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
945 printf("tag=%c%c%c%c size=0x%x\n",
953 case MKTAG('i', 'd', 'x', '1'):
954 if (avi_read_idx1(s, size) < 0)
967 url_fseek(pb, pos, SEEK_SET);
971 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
973 AVIContext *avi = s->priv_data;
978 if (!avi->index_loaded) {
979 /* we only load the index on demand */
981 avi->index_loaded = 1;
983 assert(stream_index>= 0);
985 st = s->streams[stream_index];
986 index= av_index_search_timestamp(st, timestamp, flags);
990 /* find the position */
991 pos = st->index_entries[index].pos;
992 timestamp = st->index_entries[index].timestamp;
994 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
996 if (ENABLE_DV_DEMUXER && avi->dv_demux) {
997 /* One and only one real stream for DV in AVI, and it has video */
998 /* offsets. Calling with other stream indices should have failed */
999 /* the av_index_search_timestamp call above. */
1000 assert(stream_index == 0);
1002 /* Feed the DV video stream version of the timestamp to the */
1003 /* DV demux so it can synth correct timestamps */
1004 dv_offset_reset(avi->dv_demux, timestamp);
1006 url_fseek(s->pb, pos, SEEK_SET);
1007 avi->stream_index= -1;
1011 for(i = 0; i < s->nb_streams; i++) {
1012 AVStream *st2 = s->streams[i];
1013 AVIStream *ast2 = st2->priv_data;
1018 if (st2->nb_index_entries <= 0)
1021 // assert(st2->codec->block_align);
1022 assert(st2->time_base.den == ast2->rate);
1023 assert(st2->time_base.num == ast2->scale);
1024 index = av_index_search_timestamp(
1026 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
1027 flags | AVSEEK_FLAG_BACKWARD);
1031 if(!avi->non_interleaved){
1032 while(index>0 && st2->index_entries[index].pos > pos)
1034 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1038 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1039 /* extract the current frame number */
1040 ast2->frame_offset = st2->index_entries[index].timestamp;
1041 if(ast2->sample_size)
1042 ast2->frame_offset *=ast2->sample_size;
1046 url_fseek(s->pb, pos, SEEK_SET);
1047 avi->stream_index= -1;
1051 static int avi_read_close(AVFormatContext *s)
1054 AVIContext *avi = s->priv_data;
1056 for(i=0;i<s->nb_streams;i++) {
1057 AVStream *st = s->streams[i];
1058 AVIStream *ast = st->priv_data;
1060 av_free(st->codec->palctrl);
1064 av_free(avi->dv_demux);
1069 static int avi_probe(AVProbeData *p)
1073 /* check file header */
1074 for(i=0; avi_headers[i][0]; i++)
1075 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1076 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1077 return AVPROBE_SCORE_MAX;
1082 AVInputFormat avi_demuxer = {