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
25 #include "libavutil/intreadwrite.h"
26 #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 dprintf(NULL, "%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;
173 if(last_pos != pos && (len || !ast->sample_size))
174 av_add_index_entry(st, pos, ast->cum_len, 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, 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;
237 if (size == UINT_MAX)
239 value = av_malloc(size+1);
242 get_strz(pb, value, size);
244 return av_metadata_set2(&s->metadata, key, value,
245 AV_METADATA_DONT_STRDUP_VAL);
248 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
250 AVIContext *avi = s->priv_data;
251 ByteIOContext *pb = s->pb;
252 unsigned int tag, tag1, handler;
253 int codec_type, stream_index, frame_period, bit_rate;
254 unsigned int size, nb_frames;
257 AVIStream *ast = NULL;
258 int avih_width=0, avih_height=0;
259 int amv_file_format=0;
260 uint64_t list_end = 0;
262 avi->stream_index= -1;
264 if (get_riff(s, pb) < 0)
267 avi->fsize = url_fsize(pb);
269 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
281 print_tag("tag", tag, size);
285 case MKTAG('L', 'I', 'S', 'T'):
286 list_end = url_ftell(pb) + size;
287 /* Ignored, except at start of video packets. */
290 print_tag("list", tag1, 0);
292 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
293 avi->movi_list = url_ftell(pb) - 4;
294 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
295 else avi->movi_end = url_fsize(pb);
296 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
300 case MKTAG('d', 'm', 'l', 'h'):
302 url_fskip(pb, size + (size & 1));
304 case MKTAG('a', 'm', 'v', 'h'):
306 case MKTAG('a', 'v', 'i', 'h'):
308 /* using frame_period is bad idea */
309 frame_period = get_le32(pb);
310 bit_rate = get_le32(pb) * 8;
312 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
314 url_fskip(pb, 2 * 4);
317 avih_width=get_le32(pb);
318 avih_height=get_le32(pb);
320 url_fskip(pb, size - 10 * 4);
322 case MKTAG('s', 't', 'r', 'h'):
326 handler = get_le32(pb); /* codec tag */
328 if(tag1 == MKTAG('p', 'a', 'd', 's')){
329 url_fskip(pb, size - 8);
333 st = av_new_stream(s, stream_index);
337 ast = av_mallocz(sizeof(AVIStream));
343 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
346 print_tag("strh", tag1, -1);
348 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
352 * After some consideration -- I don't think we
353 * have to support anything but DV in type1 AVIs.
355 if (s->nb_streams != 1)
358 if (handler != MKTAG('d', 'v', 's', 'd') &&
359 handler != MKTAG('d', 'v', 'h', 'd') &&
360 handler != MKTAG('d', 'v', 's', 'l'))
363 ast = s->streams[0]->priv_data;
364 av_freep(&s->streams[0]->codec->extradata);
365 av_freep(&s->streams[0]);
367 if (CONFIG_DV_DEMUXER) {
368 avi->dv_demux = dv_init_demux(s);
372 s->streams[0]->priv_data = ast;
373 url_fskip(pb, 3 * 4);
374 ast->scale = get_le32(pb);
375 ast->rate = get_le32(pb);
376 url_fskip(pb, 4); /* start time */
378 dv_dur = get_le32(pb);
379 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
380 dv_dur *= AV_TIME_BASE;
381 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
384 * else, leave duration alone; timing estimation in utils.c
385 * will make a guess based on bitrate.
388 stream_index = s->nb_streams - 1;
389 url_fskip(pb, size - 9*4);
393 assert(stream_index < s->nb_streams);
394 st->codec->stream_codec_tag= handler;
396 get_le32(pb); /* flags */
397 get_le16(pb); /* priority */
398 get_le16(pb); /* language */
399 get_le32(pb); /* initial frame */
400 ast->scale = get_le32(pb);
401 ast->rate = get_le32(pb);
402 if(!(ast->scale && ast->rate)){
403 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);
406 ast->scale = frame_period;
412 av_set_pts_info(st, 64, ast->scale, ast->rate);
414 ast->cum_len=get_le32(pb); /* start */
415 nb_frames = get_le32(pb);
418 st->duration = nb_frames;
419 get_le32(pb); /* buffer size */
420 get_le32(pb); /* quality */
421 ast->sample_size = get_le32(pb); /* sample ssize */
422 ast->cum_len *= FFMAX(1, ast->sample_size);
423 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
426 case MKTAG('v', 'i', 'd', 's'):
427 codec_type = CODEC_TYPE_VIDEO;
429 ast->sample_size = 0;
431 case MKTAG('a', 'u', 'd', 's'):
432 codec_type = CODEC_TYPE_AUDIO;
434 case MKTAG('t', 'x', 't', 's'):
436 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
438 case MKTAG('d', 'a', 't', 's'):
439 codec_type = CODEC_TYPE_DATA;
442 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
445 ast->frame_offset= ast->cum_len;
446 url_fskip(pb, size - 12 * 4);
448 case MKTAG('s', 't', 'r', 'f'):
450 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
453 uint64_t cur_pos = url_ftell(pb);
454 if (cur_pos < list_end)
455 size = FFMIN(size, list_end - cur_pos);
456 st = s->streams[stream_index];
458 case CODEC_TYPE_VIDEO:
460 st->codec->width=avih_width;
461 st->codec->height=avih_height;
462 st->codec->codec_type = CODEC_TYPE_VIDEO;
463 st->codec->codec_id = CODEC_ID_AMV;
467 get_le32(pb); /* size */
468 st->codec->width = get_le32(pb);
469 st->codec->height = (int32_t)get_le32(pb);
470 get_le16(pb); /* panes */
471 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
473 get_le32(pb); /* ImageSize */
474 get_le32(pb); /* XPelsPerMeter */
475 get_le32(pb); /* YPelsPerMeter */
476 get_le32(pb); /* ClrUsed */
477 get_le32(pb); /* ClrImportant */
479 if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
480 st->codec->codec_type = CODEC_TYPE_SUBTITLE;
481 st->codec->codec_tag = tag1;
482 st->codec->codec_id = CODEC_ID_XSUB;
486 if(size > 10*4 && size<(1<<30)){
487 st->codec->extradata_size= size - 10*4;
488 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
489 if (!st->codec->extradata) {
490 st->codec->extradata_size= 0;
491 return AVERROR(ENOMEM);
493 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
496 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
499 /* Extract palette from extradata if bpp <= 8. */
500 /* This code assumes that extradata contains only palette. */
501 /* This is true for all paletted codecs implemented in FFmpeg. */
502 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
503 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
505 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
506 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
508 memcpy(st->codec->palctrl->palette, st->codec->extradata,
509 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
511 st->codec->palctrl->palette_changed = 1;
515 print_tag("video", tag1, 0);
517 st->codec->codec_type = CODEC_TYPE_VIDEO;
518 st->codec->codec_tag = tag1;
519 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
520 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
522 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
523 st->codec->extradata_size+= 9;
524 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
525 if(st->codec->extradata)
526 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
528 st->codec->height= FFABS(st->codec->height);
530 // url_fskip(pb, size - 5 * 4);
532 case CODEC_TYPE_AUDIO:
533 ff_get_wav_header(pb, st->codec, size);
534 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
535 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
536 ast->sample_size= st->codec->block_align;
538 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
540 /* Force parsing as several audio frames can be in
541 * one packet and timestamps refer to packet start. */
542 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
543 /* ADTS header is in extradata, AAC without header must be
544 * stored as exact frames. Parser not needed and it will
546 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
547 st->need_parsing = AVSTREAM_PARSE_NONE;
548 /* AVI files with Xan DPCM audio (wrongly) declare PCM
549 * audio in the header but have Axan as stream_code_tag. */
550 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
551 st->codec->codec_id = CODEC_ID_XAN_DPCM;
552 st->codec->codec_tag = 0;
555 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
558 st->codec->codec_type = CODEC_TYPE_DATA;
559 st->codec->codec_id= CODEC_ID_NONE;
560 st->codec->codec_tag= 0;
566 case MKTAG('i', 'n', 'd', 'x'):
568 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
569 read_braindead_odml_indx(s, 0);
571 url_fseek(pb, i+size, SEEK_SET);
573 case MKTAG('v', 'p', 'r', 'p'):
574 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
575 AVRational active, active_aspect;
577 st = s->streams[stream_index];
584 active_aspect.den= get_le16(pb);
585 active_aspect.num= get_le16(pb);
586 active.num = get_le32(pb);
587 active.den = get_le32(pb);
588 get_le32(pb); //nbFieldsPerFrame
590 if(active_aspect.num && active_aspect.den && active.num && active.den){
591 st->sample_aspect_ratio= av_div_q(active_aspect, active);
592 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
596 url_fseek(pb, size, SEEK_CUR);
598 case MKTAG('I', 'N', 'A', 'M'):
599 avi_read_tag(s, "Title", size);
601 case MKTAG('I', 'A', 'R', 'T'):
602 avi_read_tag(s, "Artist", size);
604 case MKTAG('I', 'C', 'O', 'P'):
605 avi_read_tag(s, "Copyright", size);
607 case MKTAG('I', 'C', 'M', 'T'):
608 avi_read_tag(s, "Comment", size);
610 case MKTAG('I', 'G', 'N', 'R'):
611 avi_read_tag(s, "Genre", size);
613 case MKTAG('I', 'P', 'R', 'D'):
614 avi_read_tag(s, "Album", size);
616 case MKTAG('I', 'P', 'R', 'T'):
617 avi_read_tag(s, "Track", size);
621 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
622 "I will ignore it and try to continue anyway.\n");
623 avi->movi_list = url_ftell(pb) - 4;
624 avi->movi_end = url_fsize(pb);
634 /* check stream number */
635 if (stream_index != s->nb_streams - 1) {
640 if(!avi->index_loaded && !url_is_streamed(pb))
642 avi->index_loaded = 1;
643 avi->non_interleaved |= guess_ni_flag(s);
644 if(avi->non_interleaved) {
645 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
652 static int get_stream_idx(int *d){
653 if( d[0] >= '0' && d[0] <= '9'
654 && d[1] >= '0' && d[1] <= '9'){
655 return (d[0] - '0') * 10 + (d[1] - '0');
657 return 100; //invalid stream ID
661 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
663 AVIContext *avi = s->priv_data;
664 ByteIOContext *pb = s->pb;
670 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
671 int size = dv_get_packet(avi->dv_demux, pkt);
676 if(avi->non_interleaved){
677 int best_stream_index = 0;
678 AVStream *best_st= NULL;
680 int64_t best_ts= INT64_MAX;
683 for(i=0; i<s->nb_streams; i++){
684 AVStream *st = s->streams[i];
685 AVIStream *ast = st->priv_data;
686 int64_t ts= ast->frame_offset;
689 if(!st->nb_index_entries)
692 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
693 if(!ast->remaining && ts > last_ts)
696 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
698 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
702 best_stream_index= i;
708 best_ast = best_st->priv_data;
709 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
710 if(best_ast->remaining)
711 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
713 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
715 best_ast->frame_offset= best_st->index_entries[i].timestamp;
718 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
720 int64_t pos= best_st->index_entries[i].pos;
721 pos += best_ast->packet_size - best_ast->remaining;
722 url_fseek(s->pb, pos + 8, SEEK_SET);
723 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
725 assert(best_ast->remaining <= best_ast->packet_size);
727 avi->stream_index= best_stream_index;
728 if(!best_ast->remaining)
729 best_ast->packet_size=
730 best_ast->remaining= best_st->index_entries[i].size;
735 if(avi->stream_index >= 0){
736 AVStream *st= s->streams[ avi->stream_index ];
737 AVIStream *ast= st->priv_data;
740 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
742 else if(ast->sample_size < 32)
743 size= 64*ast->sample_size;
745 size= ast->sample_size;
747 if(size > ast->remaining)
748 size= ast->remaining;
749 avi->last_pkt_pos= url_ftell(pb);
750 err= av_get_packet(pb, pkt, size);
754 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
755 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
760 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
762 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
765 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
766 dstr = pkt->destruct;
767 size = dv_produce_packet(avi->dv_demux, pkt,
768 pkt->data, pkt->size);
769 pkt->destruct = dstr;
770 pkt->flags |= PKT_FLAG_KEY;
772 /* XXX: How to handle B-frames in AVI? */
773 pkt->dts = ast->frame_offset;
774 // pkt->dts += ast->start;
776 pkt->dts /= ast->sample_size;
777 //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);
778 pkt->stream_index = avi->stream_index;
780 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
783 assert(st->index_entries);
785 index= av_index_search_timestamp(st, ast->frame_offset, 0);
786 e= &st->index_entries[index];
788 if(index >= 0 && e->timestamp == ast->frame_offset){
789 if (e->flags & AVINDEX_KEYFRAME)
790 pkt->flags |= PKT_FLAG_KEY;
793 pkt->flags |= PKT_FLAG_KEY;
796 ast->frame_offset += pkt->size;
800 ast->remaining -= size;
802 avi->stream_index= -1;
809 memset(d, -1, sizeof(int)*8);
810 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
817 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
819 n= get_stream_idx(d+2);
820 //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);
821 if(i + (uint64_t)size > avi->fsize || d[0]<0)
825 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
827 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
828 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
830 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
835 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
840 n= get_stream_idx(d);
842 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
845 //detect ##ix chunk and skip
846 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
852 if(n < s->nb_streams){
858 if(s->nb_streams>=2){
859 AVStream *st1 = s->streams[1];
860 AVIStream *ast1= st1->priv_data;
861 //workaround for broken small-file-bug402.avi
862 if( d[2] == 'w' && d[3] == 'b'
864 && st ->codec->codec_type == CODEC_TYPE_VIDEO
865 && st1->codec->codec_type == CODEC_TYPE_AUDIO
866 && ast->prefix == 'd'*256+'c'
867 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
872 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
877 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
878 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
879 || st->discard >= AVDISCARD_ALL){
880 if(ast->sample_size) ast->frame_offset += pkt->size;
881 else ast->frame_offset++;
886 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
887 int k = get_byte(pb);
888 int last = (k + get_byte(pb) - 1) & 0xFF;
890 get_le16(pb); //flags
892 for (; k <= last; k++)
893 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
896 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
897 d[2]*256+d[3] == ast->prefix /*||
898 (d[2] == 'd' && d[3] == 'c') ||
899 (d[2] == 'w' && d[3] == 'b')*/) {
901 //av_log(s, AV_LOG_DEBUG, "OK\n");
902 if(d[2]*256+d[3] == ast->prefix)
905 ast->prefix= d[2]*256+d[3];
906 ast->prefix_count= 0;
909 avi->stream_index= n;
910 ast->packet_size= size + 8;
911 ast->remaining= size;
913 if(size || !ast->sample_size){
914 uint64_t pos= url_ftell(pb) - 8;
915 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
916 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
927 /* XXX: We make the implicit supposition that the positions are sorted
929 static int avi_read_idx1(AVFormatContext *s, int size)
931 AVIContext *avi = s->priv_data;
932 ByteIOContext *pb = s->pb;
933 int nb_index_entries, i;
936 unsigned int index, tag, flags, pos, len;
937 unsigned last_pos= -1;
939 nb_index_entries = size / 16;
940 if (nb_index_entries <= 0)
943 /* Read the entries and sort them in each stream component. */
944 for(i = 0; i < nb_index_entries; i++) {
946 flags = get_le32(pb);
949 #if defined(DEBUG_SEEK)
950 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
951 i, tag, flags, pos, len);
953 if(i==0 && pos > avi->movi_list)
954 avi->movi_list= 0; //FIXME better check
955 pos += avi->movi_list;
957 index = ((tag & 0xff) - '0') * 10;
958 index += ((tag >> 8) & 0xff) - '0';
959 if (index >= s->nb_streams)
961 st = s->streams[index];
964 #if defined(DEBUG_SEEK)
965 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
971 avi->non_interleaved= 1;
972 else if(len || !ast->sample_size)
973 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
983 static int guess_ni_flag(AVFormatContext *s){
985 int64_t last_start=0;
986 int64_t first_end= INT64_MAX;
987 int64_t oldpos= url_ftell(s->pb);
989 for(i=0; i<s->nb_streams; i++){
990 AVStream *st = s->streams[i];
991 int n= st->nb_index_entries;
998 int64_t pos= st->index_entries[0].pos;
999 url_fseek(s->pb, pos + 4, SEEK_SET);
1000 size= get_le32(s->pb);
1001 if(pos + size > st->index_entries[1].pos)
1002 last_start= INT64_MAX;
1005 if(st->index_entries[0].pos > last_start)
1006 last_start= st->index_entries[0].pos;
1007 if(st->index_entries[n-1].pos < first_end)
1008 first_end= st->index_entries[n-1].pos;
1010 url_fseek(s->pb, oldpos, SEEK_SET);
1011 return last_start > first_end;
1014 static int avi_load_index(AVFormatContext *s)
1016 AVIContext *avi = s->priv_data;
1017 ByteIOContext *pb = s->pb;
1019 int64_t pos= url_ftell(pb);
1022 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1023 goto the_end; // maybe truncated file
1025 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1031 size = get_le32(pb);
1033 printf("tag=%c%c%c%c size=0x%x\n",
1041 case MKTAG('i', 'd', 'x', '1'):
1042 if (avi_read_idx1(s, size) < 0)
1050 if (url_fseek(pb, size, SEEK_CUR) < 0)
1051 goto the_end; // something is wrong here
1056 url_fseek(pb, pos, SEEK_SET);
1060 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1062 AVIContext *avi = s->priv_data;
1068 if (!avi->index_loaded) {
1069 /* we only load the index on demand */
1071 avi->index_loaded = 1;
1073 assert(stream_index>= 0);
1075 st = s->streams[stream_index];
1077 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1081 /* find the position */
1082 pos = st->index_entries[index].pos;
1083 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1085 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1087 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1088 /* One and only one real stream for DV in AVI, and it has video */
1089 /* offsets. Calling with other stream indexes should have failed */
1090 /* the av_index_search_timestamp call above. */
1091 assert(stream_index == 0);
1093 /* Feed the DV video stream version of the timestamp to the */
1094 /* DV demux so it can synthesize correct timestamps. */
1095 dv_offset_reset(avi->dv_demux, timestamp);
1097 url_fseek(s->pb, pos, SEEK_SET);
1098 avi->stream_index= -1;
1102 for(i = 0; i < s->nb_streams; i++) {
1103 AVStream *st2 = s->streams[i];
1104 AVIStream *ast2 = st2->priv_data;
1109 if (st2->nb_index_entries <= 0)
1112 // assert(st2->codec->block_align);
1113 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1114 index = av_index_search_timestamp(
1116 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1117 flags | AVSEEK_FLAG_BACKWARD);
1121 if(!avi->non_interleaved){
1122 while(index>0 && st2->index_entries[index].pos > pos)
1124 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1128 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1129 /* extract the current frame number */
1130 ast2->frame_offset = st2->index_entries[index].timestamp;
1134 url_fseek(s->pb, pos, SEEK_SET);
1135 avi->stream_index= -1;
1139 static int avi_read_close(AVFormatContext *s)
1142 AVIContext *avi = s->priv_data;
1144 for(i=0;i<s->nb_streams;i++) {
1145 AVStream *st = s->streams[i];
1146 av_free(st->codec->palctrl);
1150 av_free(avi->dv_demux);
1155 static int avi_probe(AVProbeData *p)
1159 /* check file header */
1160 for(i=0; avi_headers[i][0]; i++)
1161 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1162 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1163 return AVPROBE_SCORE_MAX;
1168 AVInputFormat avi_demuxer = {
1170 NULL_IF_CONFIG_SMALL("AVI format"),