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'
51 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
64 DVDemuxContext* dv_demux;
66 #define MAX_ODML_DEPTH 1000
69 static const char avi_headers[][8] = {
70 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
71 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
72 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
73 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
74 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
78 static int avi_load_index(AVFormatContext *s);
79 static int guess_ni_flag(AVFormatContext *s);
82 static void print_tag(const char *str, unsigned int tag, int size)
84 dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
93 static inline int get_duration(AVIStream *ast, int len){
96 }else if (ast->dshow_block_align){
97 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
102 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
104 AVIContext *avi = s->priv_data;
108 /* check RIFF header */
109 get_buffer(pb, header, 4);
110 avi->riff_end = get_le32(pb); /* RIFF chunk size */
111 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
112 get_buffer(pb, header+4, 4);
114 for(i=0; avi_headers[i][0]; i++)
115 if(!memcmp(header, avi_headers[i], 8))
117 if(!avi_headers[i][0])
120 if(header[7] == 0x19)
121 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
126 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
127 AVIContext *avi = s->priv_data;
128 ByteIOContext *pb = s->pb;
129 int longs_pre_entry= get_le16(pb);
130 int index_sub_type = get_byte(pb);
131 int index_type = get_byte(pb);
132 int entries_in_use = get_le32(pb);
133 int chunk_id = get_le32(pb);
134 int64_t base = get_le64(pb);
135 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
139 int64_t last_pos= -1;
140 int64_t filesize= url_fsize(s->pb);
143 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
144 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
147 if(stream_id >= s->nb_streams || stream_id < 0)
149 st= s->streams[stream_id];
157 if(index_type && longs_pre_entry != 2)
162 if(filesize > 0 && base >= filesize){
163 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
164 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
170 for(i=0; i<entries_in_use; i++){
172 int64_t pos= get_le32(pb) + base - 8;
173 int len = get_le32(pb);
178 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
183 if(last_pos == pos || pos == base - 8)
184 avi->non_interleaved= 1;
185 if(last_pos != pos && (len || !ast->sample_size))
186 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
188 ast->cum_len += get_duration(ast, len);
193 offset = get_le64(pb);
194 get_le32(pb); /* size */
195 duration = get_le32(pb);
202 if(avi->odml_depth > MAX_ODML_DEPTH){
203 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
207 url_fseek(pb, offset+8, SEEK_SET);
209 read_braindead_odml_indx(s, frame_num);
211 frame_num += duration;
213 url_fseek(pb, pos, SEEK_SET);
220 static void clean_index(AVFormatContext *s){
224 for(i=0; i<s->nb_streams; i++){
225 AVStream *st = s->streams[i];
226 AVIStream *ast = st->priv_data;
227 int n= st->nb_index_entries;
228 int max= ast->sample_size;
229 int64_t pos, size, ts;
231 if(n != 1 || ast->sample_size==0)
234 while(max < 1024) max+=max;
236 pos= st->index_entries[0].pos;
237 size= st->index_entries[0].size;
238 ts= st->index_entries[0].timestamp;
240 for(j=0; j<size; j+=max){
241 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
246 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
248 ByteIOContext *pb = s->pb;
249 char key[5] = {0}, *value;
253 if (size == UINT_MAX)
255 value = av_malloc(size+1);
258 get_buffer(pb, value, size);
264 return av_metadata_set2(&st->metadata, key, value,
265 AV_METADATA_DONT_STRDUP_VAL);
267 return av_metadata_set2(&s->metadata, key, value,
268 AV_METADATA_DONT_STRDUP_VAL);
271 static void avi_read_info(AVFormatContext *s, uint64_t end)
273 while (url_ftell(s->pb) < end) {
274 uint32_t tag = get_le32(s->pb);
275 uint32_t size = get_le32(s->pb);
276 avi_read_tag(s, NULL, tag, size);
280 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
282 AVIContext *avi = s->priv_data;
283 ByteIOContext *pb = s->pb;
284 unsigned int tag, tag1, handler;
285 int codec_type, stream_index, frame_period, bit_rate;
289 AVIStream *ast = NULL;
290 int avih_width=0, avih_height=0;
291 int amv_file_format=0;
292 uint64_t list_end = 0;
294 avi->stream_index= -1;
296 if (get_riff(s, pb) < 0)
299 avi->fsize = url_fsize(pb);
301 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
313 print_tag("tag", tag, size);
317 case MKTAG('L', 'I', 'S', 'T'):
318 list_end = url_ftell(pb) + size;
319 /* Ignored, except at start of video packets. */
322 print_tag("list", tag1, 0);
324 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
325 avi->movi_list = url_ftell(pb) - 4;
326 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
327 else avi->movi_end = url_fsize(pb);
328 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
331 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
332 avi_read_info(s, list_end);
335 case MKTAG('d', 'm', 'l', 'h'):
337 url_fskip(pb, size + (size & 1));
339 case MKTAG('a', 'm', 'v', 'h'):
341 case MKTAG('a', 'v', 'i', 'h'):
343 /* using frame_period is bad idea */
344 frame_period = get_le32(pb);
345 bit_rate = get_le32(pb) * 8;
347 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
349 url_fskip(pb, 2 * 4);
352 avih_width=get_le32(pb);
353 avih_height=get_le32(pb);
355 url_fskip(pb, size - 10 * 4);
357 case MKTAG('s', 't', 'r', 'h'):
361 handler = get_le32(pb); /* codec tag */
363 if(tag1 == MKTAG('p', 'a', 'd', 's')){
364 url_fskip(pb, size - 8);
368 st = av_new_stream(s, stream_index);
372 ast = av_mallocz(sizeof(AVIStream));
378 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
381 print_tag("strh", tag1, -1);
383 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
387 * After some consideration -- I don't think we
388 * have to support anything but DV in type1 AVIs.
390 if (s->nb_streams != 1)
393 if (handler != MKTAG('d', 'v', 's', 'd') &&
394 handler != MKTAG('d', 'v', 'h', 'd') &&
395 handler != MKTAG('d', 'v', 's', 'l'))
398 ast = s->streams[0]->priv_data;
399 av_freep(&s->streams[0]->codec->extradata);
400 av_freep(&s->streams[0]->codec);
401 av_freep(&s->streams[0]);
403 if (CONFIG_DV_DEMUXER) {
404 avi->dv_demux = dv_init_demux(s);
408 s->streams[0]->priv_data = ast;
409 url_fskip(pb, 3 * 4);
410 ast->scale = get_le32(pb);
411 ast->rate = get_le32(pb);
412 url_fskip(pb, 4); /* start time */
414 dv_dur = get_le32(pb);
415 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
416 dv_dur *= AV_TIME_BASE;
417 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
420 * else, leave duration alone; timing estimation in utils.c
421 * will make a guess based on bitrate.
424 stream_index = s->nb_streams - 1;
425 url_fskip(pb, size - 9*4);
429 assert(stream_index < s->nb_streams);
430 st->codec->stream_codec_tag= handler;
432 get_le32(pb); /* flags */
433 get_le16(pb); /* priority */
434 get_le16(pb); /* language */
435 get_le32(pb); /* initial frame */
436 ast->scale = get_le32(pb);
437 ast->rate = get_le32(pb);
438 if(!(ast->scale && ast->rate)){
439 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);
442 ast->scale = frame_period;
448 av_set_pts_info(st, 64, ast->scale, ast->rate);
450 ast->cum_len=get_le32(pb); /* start */
451 st->nb_frames = get_le32(pb);
454 get_le32(pb); /* buffer size */
455 get_le32(pb); /* quality */
456 ast->sample_size = get_le32(pb); /* sample ssize */
457 ast->cum_len *= FFMAX(1, ast->sample_size);
458 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
461 case MKTAG('v', 'i', 'd', 's'):
462 codec_type = AVMEDIA_TYPE_VIDEO;
464 ast->sample_size = 0;
466 case MKTAG('a', 'u', 'd', 's'):
467 codec_type = AVMEDIA_TYPE_AUDIO;
469 case MKTAG('t', 'x', 't', 's'):
471 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ? FIXME
473 case MKTAG('d', 'a', 't', 's'):
474 codec_type = AVMEDIA_TYPE_DATA;
477 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
480 if(ast->sample_size == 0)
481 st->duration = st->nb_frames;
482 ast->frame_offset= ast->cum_len;
483 url_fskip(pb, size - 12 * 4);
485 case MKTAG('s', 't', 'r', 'f'):
487 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
490 uint64_t cur_pos = url_ftell(pb);
491 if (cur_pos < list_end)
492 size = FFMIN(size, list_end - cur_pos);
493 st = s->streams[stream_index];
495 case AVMEDIA_TYPE_VIDEO:
497 st->codec->width=avih_width;
498 st->codec->height=avih_height;
499 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
500 st->codec->codec_id = CODEC_ID_AMV;
504 get_le32(pb); /* size */
505 st->codec->width = get_le32(pb);
506 st->codec->height = (int32_t)get_le32(pb);
507 get_le16(pb); /* panes */
508 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
510 get_le32(pb); /* ImageSize */
511 get_le32(pb); /* XPelsPerMeter */
512 get_le32(pb); /* YPelsPerMeter */
513 get_le32(pb); /* ClrUsed */
514 get_le32(pb); /* ClrImportant */
516 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
517 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
518 st->codec->codec_tag = tag1;
519 st->codec->codec_id = CODEC_ID_XSUB;
523 if(size > 10*4 && size<(1<<30)){
524 st->codec->extradata_size= size - 10*4;
525 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
526 if (!st->codec->extradata) {
527 st->codec->extradata_size= 0;
528 return AVERROR(ENOMEM);
530 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
533 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
536 /* Extract palette from extradata if bpp <= 8. */
537 /* This code assumes that extradata contains only palette. */
538 /* This is true for all paletted codecs implemented in FFmpeg. */
539 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
540 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
542 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
543 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
545 memcpy(st->codec->palctrl->palette, st->codec->extradata,
546 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
548 st->codec->palctrl->palette_changed = 1;
552 print_tag("video", tag1, 0);
554 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
555 st->codec->codec_tag = tag1;
556 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
557 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
558 // Support "Resolution 1:1" for Avid AVI Codec
559 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
560 st->codec->extradata_size >= 31 &&
561 !memcmp(&st->codec->extradata[28], "1:1", 3))
562 st->codec->codec_id = CODEC_ID_RAWVIDEO;
564 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
565 st->codec->extradata_size+= 9;
566 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
567 if(st->codec->extradata)
568 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
570 st->codec->height= FFABS(st->codec->height);
572 // url_fskip(pb, size - 5 * 4);
574 case AVMEDIA_TYPE_AUDIO:
575 ff_get_wav_header(pb, st->codec, size);
576 ast->dshow_block_align= st->codec->block_align;
577 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
578 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
579 ast->sample_size= st->codec->block_align;
581 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
583 /* Force parsing as several audio frames can be in
584 * one packet and timestamps refer to packet start. */
585 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
586 /* ADTS header is in extradata, AAC without header must be
587 * stored as exact frames. Parser not needed and it will
589 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
590 st->need_parsing = AVSTREAM_PARSE_NONE;
591 /* AVI files with Xan DPCM audio (wrongly) declare PCM
592 * audio in the header but have Axan as stream_code_tag. */
593 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
594 st->codec->codec_id = CODEC_ID_XAN_DPCM;
595 st->codec->codec_tag = 0;
597 if (amv_file_format){
598 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
599 ast->dshow_block_align = 0;
603 st->codec->codec_type = AVMEDIA_TYPE_DATA;
604 st->codec->codec_id= CODEC_ID_NONE;
605 st->codec->codec_tag= 0;
611 case MKTAG('i', 'n', 'd', 'x'):
613 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
614 read_braindead_odml_indx(s, 0);
616 url_fseek(pb, i+size, SEEK_SET);
618 case MKTAG('v', 'p', 'r', 'p'):
619 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
620 AVRational active, active_aspect;
622 st = s->streams[stream_index];
629 active_aspect.den= get_le16(pb);
630 active_aspect.num= get_le16(pb);
631 active.num = get_le32(pb);
632 active.den = get_le32(pb);
633 get_le32(pb); //nbFieldsPerFrame
635 if(active_aspect.num && active_aspect.den && active.num && active.den){
636 st->sample_aspect_ratio= av_div_q(active_aspect, active);
637 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
641 url_fseek(pb, size, SEEK_CUR);
643 case MKTAG('s', 't', 'r', 'n'):
645 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
650 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
651 "I will ignore it and try to continue anyway.\n");
652 avi->movi_list = url_ftell(pb) - 4;
653 avi->movi_end = url_fsize(pb);
663 /* check stream number */
664 if (stream_index != s->nb_streams - 1) {
669 if(!avi->index_loaded && !url_is_streamed(pb))
671 avi->index_loaded = 1;
672 avi->non_interleaved |= guess_ni_flag(s);
673 for(i=0; i<s->nb_streams; i++){
674 AVStream *st = s->streams[i];
675 if(st->nb_index_entries)
678 if(i==s->nb_streams && avi->non_interleaved) {
679 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
680 avi->non_interleaved=0;
683 if(avi->non_interleaved) {
684 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
691 static int get_stream_idx(int *d){
692 if( d[0] >= '0' && d[0] <= '9'
693 && d[1] >= '0' && d[1] <= '9'){
694 return (d[0] - '0') * 10 + (d[1] - '0');
696 return 100; //invalid stream ID
700 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
702 AVIContext *avi = s->priv_data;
703 ByteIOContext *pb = s->pb;
709 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
710 int size = dv_get_packet(avi->dv_demux, pkt);
715 if(avi->non_interleaved){
716 int best_stream_index = 0;
717 AVStream *best_st= NULL;
719 int64_t best_ts= INT64_MAX;
722 for(i=0; i<s->nb_streams; i++){
723 AVStream *st = s->streams[i];
724 AVIStream *ast = st->priv_data;
725 int64_t ts= ast->frame_offset;
728 if(!st->nb_index_entries)
731 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
732 if(!ast->remaining && ts > last_ts)
735 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
737 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
741 best_stream_index= i;
747 best_ast = best_st->priv_data;
748 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
749 if(best_ast->remaining)
750 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
752 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
754 best_ast->frame_offset= best_st->index_entries[i].timestamp;
757 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
759 int64_t pos= best_st->index_entries[i].pos;
760 pos += best_ast->packet_size - best_ast->remaining;
761 url_fseek(s->pb, pos + 8, SEEK_SET);
762 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
764 assert(best_ast->remaining <= best_ast->packet_size);
766 avi->stream_index= best_stream_index;
767 if(!best_ast->remaining)
768 best_ast->packet_size=
769 best_ast->remaining= best_st->index_entries[i].size;
774 if(avi->stream_index >= 0){
775 AVStream *st= s->streams[ avi->stream_index ];
776 AVIStream *ast= st->priv_data;
779 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
781 else if(ast->sample_size < 32)
782 // arbitrary multiplier to avoid tiny packets for raw PCM data
783 size= 1024*ast->sample_size;
785 size= ast->sample_size;
787 if(size > ast->remaining)
788 size= ast->remaining;
789 avi->last_pkt_pos= url_ftell(pb);
790 err= av_get_packet(pb, pkt, size);
794 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
795 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
800 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
802 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
805 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
806 dstr = pkt->destruct;
807 size = dv_produce_packet(avi->dv_demux, pkt,
808 pkt->data, pkt->size);
809 pkt->destruct = dstr;
810 pkt->flags |= AV_PKT_FLAG_KEY;
814 /* XXX: How to handle B-frames in AVI? */
815 pkt->dts = ast->frame_offset;
816 // pkt->dts += ast->start;
818 pkt->dts /= ast->sample_size;
819 //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);
820 pkt->stream_index = avi->stream_index;
822 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
825 assert(st->index_entries);
827 index= av_index_search_timestamp(st, ast->frame_offset, 0);
828 e= &st->index_entries[index];
830 if(index >= 0 && e->timestamp == ast->frame_offset){
831 if (e->flags & AVINDEX_KEYFRAME)
832 pkt->flags |= AV_PKT_FLAG_KEY;
835 pkt->flags |= AV_PKT_FLAG_KEY;
837 ast->frame_offset += get_duration(ast, pkt->size);
839 ast->remaining -= size;
841 avi->stream_index= -1;
848 memset(d, -1, sizeof(int)*8);
849 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
856 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
858 n= get_stream_idx(d+2);
859 //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);
860 if(i + (uint64_t)size > avi->fsize || d[0]<0)
864 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
866 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
867 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
869 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
874 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
879 n= get_stream_idx(d);
881 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
884 //detect ##ix chunk and skip
885 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
891 if(n < s->nb_streams){
897 if(s->nb_streams>=2){
898 AVStream *st1 = s->streams[1];
899 AVIStream *ast1= st1->priv_data;
900 //workaround for broken small-file-bug402.avi
901 if( d[2] == 'w' && d[3] == 'b'
903 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
904 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
905 && ast->prefix == 'd'*256+'c'
906 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
911 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
916 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
917 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
918 || st->discard >= AVDISCARD_ALL){
919 ast->frame_offset += get_duration(ast, size);
924 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
925 int k = get_byte(pb);
926 int last = (k + get_byte(pb) - 1) & 0xFF;
928 get_le16(pb); //flags
930 for (; k <= last; k++)
931 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
934 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
935 d[2]*256+d[3] == ast->prefix /*||
936 (d[2] == 'd' && d[3] == 'c') ||
937 (d[2] == 'w' && d[3] == 'b')*/) {
939 //av_log(s, AV_LOG_DEBUG, "OK\n");
940 if(d[2]*256+d[3] == ast->prefix)
943 ast->prefix= d[2]*256+d[3];
944 ast->prefix_count= 0;
947 avi->stream_index= n;
948 ast->packet_size= size + 8;
949 ast->remaining= size;
951 if(size || !ast->sample_size){
952 uint64_t pos= url_ftell(pb) - 8;
953 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
954 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
965 /* XXX: We make the implicit supposition that the positions are sorted
967 static int avi_read_idx1(AVFormatContext *s, int size)
969 AVIContext *avi = s->priv_data;
970 ByteIOContext *pb = s->pb;
971 int nb_index_entries, i;
974 unsigned int index, tag, flags, pos, len;
975 unsigned last_pos= -1;
977 nb_index_entries = size / 16;
978 if (nb_index_entries <= 0)
981 /* Read the entries and sort them in each stream component. */
982 for(i = 0; i < nb_index_entries; i++) {
984 flags = get_le32(pb);
987 #if defined(DEBUG_SEEK)
988 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
989 i, tag, flags, pos, len);
991 if(i==0 && pos > avi->movi_list)
992 avi->movi_list= 0; //FIXME better check
993 pos += avi->movi_list;
995 index = ((tag & 0xff) - '0') * 10;
996 index += ((tag >> 8) & 0xff) - '0';
997 if (index >= s->nb_streams)
999 st = s->streams[index];
1000 ast = st->priv_data;
1002 #if defined(DEBUG_SEEK)
1003 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1009 avi->non_interleaved= 1;
1010 else if(len || !ast->sample_size)
1011 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1012 ast->cum_len += get_duration(ast, len);
1018 static int guess_ni_flag(AVFormatContext *s){
1020 int64_t last_start=0;
1021 int64_t first_end= INT64_MAX;
1022 int64_t oldpos= url_ftell(s->pb);
1024 for(i=0; i<s->nb_streams; i++){
1025 AVStream *st = s->streams[i];
1026 int n= st->nb_index_entries;
1033 int64_t pos= st->index_entries[0].pos;
1034 url_fseek(s->pb, pos + 4, SEEK_SET);
1035 size= get_le32(s->pb);
1036 if(pos + size > st->index_entries[1].pos)
1037 last_start= INT64_MAX;
1040 if(st->index_entries[0].pos > last_start)
1041 last_start= st->index_entries[0].pos;
1042 if(st->index_entries[n-1].pos < first_end)
1043 first_end= st->index_entries[n-1].pos;
1045 url_fseek(s->pb, oldpos, SEEK_SET);
1046 return last_start > first_end;
1049 static int avi_load_index(AVFormatContext *s)
1051 AVIContext *avi = s->priv_data;
1052 ByteIOContext *pb = s->pb;
1054 int64_t pos= url_ftell(pb);
1057 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1058 goto the_end; // maybe truncated file
1060 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1066 size = get_le32(pb);
1068 printf("tag=%c%c%c%c size=0x%x\n",
1076 case MKTAG('i', 'd', 'x', '1'):
1077 if (avi_read_idx1(s, size) < 0)
1085 if (url_fseek(pb, size, SEEK_CUR) < 0)
1086 goto the_end; // something is wrong here
1091 url_fseek(pb, pos, SEEK_SET);
1095 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1097 AVIContext *avi = s->priv_data;
1103 if (!avi->index_loaded) {
1104 /* we only load the index on demand */
1106 avi->index_loaded = 1;
1108 assert(stream_index>= 0);
1110 st = s->streams[stream_index];
1112 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1116 /* find the position */
1117 pos = st->index_entries[index].pos;
1118 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1120 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1122 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1123 /* One and only one real stream for DV in AVI, and it has video */
1124 /* offsets. Calling with other stream indexes should have failed */
1125 /* the av_index_search_timestamp call above. */
1126 assert(stream_index == 0);
1128 /* Feed the DV video stream version of the timestamp to the */
1129 /* DV demux so it can synthesize correct timestamps. */
1130 dv_offset_reset(avi->dv_demux, timestamp);
1132 url_fseek(s->pb, pos, SEEK_SET);
1133 avi->stream_index= -1;
1137 for(i = 0; i < s->nb_streams; i++) {
1138 AVStream *st2 = s->streams[i];
1139 AVIStream *ast2 = st2->priv_data;
1144 if (st2->nb_index_entries <= 0)
1147 // assert(st2->codec->block_align);
1148 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1149 index = av_index_search_timestamp(
1151 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1152 flags | AVSEEK_FLAG_BACKWARD);
1156 if(!avi->non_interleaved){
1157 while(index>0 && st2->index_entries[index].pos > pos)
1159 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1163 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1164 /* extract the current frame number */
1165 ast2->frame_offset = st2->index_entries[index].timestamp;
1169 url_fseek(s->pb, pos, SEEK_SET);
1170 avi->stream_index= -1;
1174 static int avi_read_close(AVFormatContext *s)
1177 AVIContext *avi = s->priv_data;
1179 for(i=0;i<s->nb_streams;i++) {
1180 AVStream *st = s->streams[i];
1181 av_free(st->codec->palctrl);
1185 av_free(avi->dv_demux);
1190 static int avi_probe(AVProbeData *p)
1194 /* check file header */
1195 for(i=0; avi_headers[i][0]; i++)
1196 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1197 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1198 return AVPROBE_SCORE_MAX;
1203 AVInputFormat avi_demuxer = {
1205 NULL_IF_CONFIG_SMALL("AVI format"),
1212 .metadata_conv = ff_avi_metadata_conv,