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]);
402 if (CONFIG_DV_DEMUXER) {
403 avi->dv_demux = dv_init_demux(s);
407 s->streams[0]->priv_data = ast;
408 url_fskip(pb, 3 * 4);
409 ast->scale = get_le32(pb);
410 ast->rate = get_le32(pb);
411 url_fskip(pb, 4); /* start time */
413 dv_dur = get_le32(pb);
414 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
415 dv_dur *= AV_TIME_BASE;
416 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
419 * else, leave duration alone; timing estimation in utils.c
420 * will make a guess based on bitrate.
423 stream_index = s->nb_streams - 1;
424 url_fskip(pb, size - 9*4);
428 assert(stream_index < s->nb_streams);
429 st->codec->stream_codec_tag= handler;
431 get_le32(pb); /* flags */
432 get_le16(pb); /* priority */
433 get_le16(pb); /* language */
434 get_le32(pb); /* initial frame */
435 ast->scale = get_le32(pb);
436 ast->rate = get_le32(pb);
437 if(!(ast->scale && ast->rate)){
438 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);
441 ast->scale = frame_period;
447 av_set_pts_info(st, 64, ast->scale, ast->rate);
449 ast->cum_len=get_le32(pb); /* start */
450 st->nb_frames = get_le32(pb);
453 get_le32(pb); /* buffer size */
454 get_le32(pb); /* quality */
455 ast->sample_size = get_le32(pb); /* sample ssize */
456 ast->cum_len *= FFMAX(1, ast->sample_size);
457 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
460 case MKTAG('v', 'i', 'd', 's'):
461 codec_type = AVMEDIA_TYPE_VIDEO;
463 ast->sample_size = 0;
465 case MKTAG('a', 'u', 'd', 's'):
466 codec_type = AVMEDIA_TYPE_AUDIO;
468 case MKTAG('t', 'x', 't', 's'):
470 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ? FIXME
472 case MKTAG('d', 'a', 't', 's'):
473 codec_type = AVMEDIA_TYPE_DATA;
476 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
479 if(ast->sample_size == 0)
480 st->duration = st->nb_frames;
481 ast->frame_offset= ast->cum_len;
482 url_fskip(pb, size - 12 * 4);
484 case MKTAG('s', 't', 'r', 'f'):
486 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
489 uint64_t cur_pos = url_ftell(pb);
490 if (cur_pos < list_end)
491 size = FFMIN(size, list_end - cur_pos);
492 st = s->streams[stream_index];
494 case AVMEDIA_TYPE_VIDEO:
496 st->codec->width=avih_width;
497 st->codec->height=avih_height;
498 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
499 st->codec->codec_id = CODEC_ID_AMV;
503 get_le32(pb); /* size */
504 st->codec->width = get_le32(pb);
505 st->codec->height = (int32_t)get_le32(pb);
506 get_le16(pb); /* panes */
507 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
509 get_le32(pb); /* ImageSize */
510 get_le32(pb); /* XPelsPerMeter */
511 get_le32(pb); /* YPelsPerMeter */
512 get_le32(pb); /* ClrUsed */
513 get_le32(pb); /* ClrImportant */
515 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
516 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
517 st->codec->codec_tag = tag1;
518 st->codec->codec_id = CODEC_ID_XSUB;
522 if(size > 10*4 && size<(1<<30)){
523 st->codec->extradata_size= size - 10*4;
524 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
525 if (!st->codec->extradata) {
526 st->codec->extradata_size= 0;
527 return AVERROR(ENOMEM);
529 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
532 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
535 /* Extract palette from extradata if bpp <= 8. */
536 /* This code assumes that extradata contains only palette. */
537 /* This is true for all paletted codecs implemented in FFmpeg. */
538 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
539 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
541 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
542 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
544 memcpy(st->codec->palctrl->palette, st->codec->extradata,
545 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
547 st->codec->palctrl->palette_changed = 1;
551 print_tag("video", tag1, 0);
553 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
554 st->codec->codec_tag = tag1;
555 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
556 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
557 // Support "Resolution 1:1" for Avid AVI Codec
558 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
559 st->codec->extradata_size >= 31 &&
560 !memcmp(&st->codec->extradata[28], "1:1", 3))
561 st->codec->codec_id = CODEC_ID_RAWVIDEO;
563 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
564 st->codec->extradata_size+= 9;
565 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
566 if(st->codec->extradata)
567 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
569 st->codec->height= FFABS(st->codec->height);
571 // url_fskip(pb, size - 5 * 4);
573 case AVMEDIA_TYPE_AUDIO:
574 ff_get_wav_header(pb, st->codec, size);
575 ast->dshow_block_align= st->codec->block_align;
576 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
577 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
578 ast->sample_size= st->codec->block_align;
580 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
582 /* Force parsing as several audio frames can be in
583 * one packet and timestamps refer to packet start. */
584 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
585 /* ADTS header is in extradata, AAC without header must be
586 * stored as exact frames. Parser not needed and it will
588 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
589 st->need_parsing = AVSTREAM_PARSE_NONE;
590 /* AVI files with Xan DPCM audio (wrongly) declare PCM
591 * audio in the header but have Axan as stream_code_tag. */
592 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
593 st->codec->codec_id = CODEC_ID_XAN_DPCM;
594 st->codec->codec_tag = 0;
596 if (amv_file_format){
597 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
598 ast->dshow_block_align = 0;
602 st->codec->codec_type = AVMEDIA_TYPE_DATA;
603 st->codec->codec_id= CODEC_ID_NONE;
604 st->codec->codec_tag= 0;
610 case MKTAG('i', 'n', 'd', 'x'):
612 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
613 read_braindead_odml_indx(s, 0);
615 url_fseek(pb, i+size, SEEK_SET);
617 case MKTAG('v', 'p', 'r', 'p'):
618 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
619 AVRational active, active_aspect;
621 st = s->streams[stream_index];
628 active_aspect.den= get_le16(pb);
629 active_aspect.num= get_le16(pb);
630 active.num = get_le32(pb);
631 active.den = get_le32(pb);
632 get_le32(pb); //nbFieldsPerFrame
634 if(active_aspect.num && active_aspect.den && active.num && active.den){
635 st->sample_aspect_ratio= av_div_q(active_aspect, active);
636 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
640 url_fseek(pb, size, SEEK_CUR);
642 case MKTAG('s', 't', 'r', 'n'):
644 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
649 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
650 "I will ignore it and try to continue anyway.\n");
651 avi->movi_list = url_ftell(pb) - 4;
652 avi->movi_end = url_fsize(pb);
662 /* check stream number */
663 if (stream_index != s->nb_streams - 1) {
668 if(!avi->index_loaded && !url_is_streamed(pb))
670 avi->index_loaded = 1;
671 avi->non_interleaved |= guess_ni_flag(s);
672 for(i=0; i<s->nb_streams; i++){
673 AVStream *st = s->streams[i];
674 if(st->nb_index_entries)
677 if(i==s->nb_streams && avi->non_interleaved) {
678 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
679 avi->non_interleaved=0;
682 if(avi->non_interleaved) {
683 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
690 static int get_stream_idx(int *d){
691 if( d[0] >= '0' && d[0] <= '9'
692 && d[1] >= '0' && d[1] <= '9'){
693 return (d[0] - '0') * 10 + (d[1] - '0');
695 return 100; //invalid stream ID
699 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
701 AVIContext *avi = s->priv_data;
702 ByteIOContext *pb = s->pb;
708 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
709 int size = dv_get_packet(avi->dv_demux, pkt);
714 if(avi->non_interleaved){
715 int best_stream_index = 0;
716 AVStream *best_st= NULL;
718 int64_t best_ts= INT64_MAX;
721 for(i=0; i<s->nb_streams; i++){
722 AVStream *st = s->streams[i];
723 AVIStream *ast = st->priv_data;
724 int64_t ts= ast->frame_offset;
727 if(!st->nb_index_entries)
730 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
731 if(!ast->remaining && ts > last_ts)
734 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
736 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
740 best_stream_index= i;
746 best_ast = best_st->priv_data;
747 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
748 if(best_ast->remaining)
749 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
751 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
753 best_ast->frame_offset= best_st->index_entries[i].timestamp;
756 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
758 int64_t pos= best_st->index_entries[i].pos;
759 pos += best_ast->packet_size - best_ast->remaining;
760 url_fseek(s->pb, pos + 8, SEEK_SET);
761 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
763 assert(best_ast->remaining <= best_ast->packet_size);
765 avi->stream_index= best_stream_index;
766 if(!best_ast->remaining)
767 best_ast->packet_size=
768 best_ast->remaining= best_st->index_entries[i].size;
773 if(avi->stream_index >= 0){
774 AVStream *st= s->streams[ avi->stream_index ];
775 AVIStream *ast= st->priv_data;
778 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
780 else if(ast->sample_size < 32)
781 // arbitrary multiplier to avoid tiny packets for raw PCM data
782 size= 1024*ast->sample_size;
784 size= ast->sample_size;
786 if(size > ast->remaining)
787 size= ast->remaining;
788 avi->last_pkt_pos= url_ftell(pb);
789 err= av_get_packet(pb, pkt, size);
793 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
794 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
799 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
801 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
804 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
805 dstr = pkt->destruct;
806 size = dv_produce_packet(avi->dv_demux, pkt,
807 pkt->data, pkt->size);
808 pkt->destruct = dstr;
809 pkt->flags |= AV_PKT_FLAG_KEY;
811 /* XXX: How to handle B-frames in AVI? */
812 pkt->dts = ast->frame_offset;
813 // pkt->dts += ast->start;
815 pkt->dts /= ast->sample_size;
816 //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);
817 pkt->stream_index = avi->stream_index;
819 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
822 assert(st->index_entries);
824 index= av_index_search_timestamp(st, ast->frame_offset, 0);
825 e= &st->index_entries[index];
827 if(index >= 0 && e->timestamp == ast->frame_offset){
828 if (e->flags & AVINDEX_KEYFRAME)
829 pkt->flags |= AV_PKT_FLAG_KEY;
832 pkt->flags |= AV_PKT_FLAG_KEY;
834 ast->frame_offset += get_duration(ast, pkt->size);
836 ast->remaining -= size;
838 avi->stream_index= -1;
845 memset(d, -1, sizeof(int)*8);
846 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
853 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
855 n= get_stream_idx(d+2);
856 //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);
857 if(i + (uint64_t)size > avi->fsize || d[0]<0)
861 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
863 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
864 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
866 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
871 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
876 n= get_stream_idx(d);
878 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
881 //detect ##ix chunk and skip
882 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
888 if(n < s->nb_streams){
894 if(s->nb_streams>=2){
895 AVStream *st1 = s->streams[1];
896 AVIStream *ast1= st1->priv_data;
897 //workaround for broken small-file-bug402.avi
898 if( d[2] == 'w' && d[3] == 'b'
900 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
901 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
902 && ast->prefix == 'd'*256+'c'
903 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
908 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
913 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
914 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
915 || st->discard >= AVDISCARD_ALL){
916 ast->frame_offset += get_duration(ast, size);
921 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
922 int k = get_byte(pb);
923 int last = (k + get_byte(pb) - 1) & 0xFF;
925 get_le16(pb); //flags
927 for (; k <= last; k++)
928 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
931 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
932 d[2]*256+d[3] == ast->prefix /*||
933 (d[2] == 'd' && d[3] == 'c') ||
934 (d[2] == 'w' && d[3] == 'b')*/) {
936 //av_log(s, AV_LOG_DEBUG, "OK\n");
937 if(d[2]*256+d[3] == ast->prefix)
940 ast->prefix= d[2]*256+d[3];
941 ast->prefix_count= 0;
944 avi->stream_index= n;
945 ast->packet_size= size + 8;
946 ast->remaining= size;
948 if(size || !ast->sample_size){
949 uint64_t pos= url_ftell(pb) - 8;
950 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
951 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
962 /* XXX: We make the implicit supposition that the positions are sorted
964 static int avi_read_idx1(AVFormatContext *s, int size)
966 AVIContext *avi = s->priv_data;
967 ByteIOContext *pb = s->pb;
968 int nb_index_entries, i;
971 unsigned int index, tag, flags, pos, len;
972 unsigned last_pos= -1;
974 nb_index_entries = size / 16;
975 if (nb_index_entries <= 0)
978 /* Read the entries and sort them in each stream component. */
979 for(i = 0; i < nb_index_entries; i++) {
981 flags = get_le32(pb);
984 #if defined(DEBUG_SEEK)
985 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
986 i, tag, flags, pos, len);
988 if(i==0 && pos > avi->movi_list)
989 avi->movi_list= 0; //FIXME better check
990 pos += avi->movi_list;
992 index = ((tag & 0xff) - '0') * 10;
993 index += ((tag >> 8) & 0xff) - '0';
994 if (index >= s->nb_streams)
996 st = s->streams[index];
999 #if defined(DEBUG_SEEK)
1000 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1006 avi->non_interleaved= 1;
1007 else if(len || !ast->sample_size)
1008 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1009 ast->cum_len += get_duration(ast, len);
1015 static int guess_ni_flag(AVFormatContext *s){
1017 int64_t last_start=0;
1018 int64_t first_end= INT64_MAX;
1019 int64_t oldpos= url_ftell(s->pb);
1021 for(i=0; i<s->nb_streams; i++){
1022 AVStream *st = s->streams[i];
1023 int n= st->nb_index_entries;
1030 int64_t pos= st->index_entries[0].pos;
1031 url_fseek(s->pb, pos + 4, SEEK_SET);
1032 size= get_le32(s->pb);
1033 if(pos + size > st->index_entries[1].pos)
1034 last_start= INT64_MAX;
1037 if(st->index_entries[0].pos > last_start)
1038 last_start= st->index_entries[0].pos;
1039 if(st->index_entries[n-1].pos < first_end)
1040 first_end= st->index_entries[n-1].pos;
1042 url_fseek(s->pb, oldpos, SEEK_SET);
1043 return last_start > first_end;
1046 static int avi_load_index(AVFormatContext *s)
1048 AVIContext *avi = s->priv_data;
1049 ByteIOContext *pb = s->pb;
1051 int64_t pos= url_ftell(pb);
1054 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1055 goto the_end; // maybe truncated file
1057 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1063 size = get_le32(pb);
1065 printf("tag=%c%c%c%c size=0x%x\n",
1073 case MKTAG('i', 'd', 'x', '1'):
1074 if (avi_read_idx1(s, size) < 0)
1082 if (url_fseek(pb, size, SEEK_CUR) < 0)
1083 goto the_end; // something is wrong here
1088 url_fseek(pb, pos, SEEK_SET);
1092 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1094 AVIContext *avi = s->priv_data;
1100 if (!avi->index_loaded) {
1101 /* we only load the index on demand */
1103 avi->index_loaded = 1;
1105 assert(stream_index>= 0);
1107 st = s->streams[stream_index];
1109 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1113 /* find the position */
1114 pos = st->index_entries[index].pos;
1115 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1117 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1119 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1120 /* One and only one real stream for DV in AVI, and it has video */
1121 /* offsets. Calling with other stream indexes should have failed */
1122 /* the av_index_search_timestamp call above. */
1123 assert(stream_index == 0);
1125 /* Feed the DV video stream version of the timestamp to the */
1126 /* DV demux so it can synthesize correct timestamps. */
1127 dv_offset_reset(avi->dv_demux, timestamp);
1129 url_fseek(s->pb, pos, SEEK_SET);
1130 avi->stream_index= -1;
1134 for(i = 0; i < s->nb_streams; i++) {
1135 AVStream *st2 = s->streams[i];
1136 AVIStream *ast2 = st2->priv_data;
1141 if (st2->nb_index_entries <= 0)
1144 // assert(st2->codec->block_align);
1145 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1146 index = av_index_search_timestamp(
1148 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1149 flags | AVSEEK_FLAG_BACKWARD);
1153 if(!avi->non_interleaved){
1154 while(index>0 && st2->index_entries[index].pos > pos)
1156 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1160 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1161 /* extract the current frame number */
1162 ast2->frame_offset = st2->index_entries[index].timestamp;
1166 url_fseek(s->pb, pos, SEEK_SET);
1167 avi->stream_index= -1;
1171 static int avi_read_close(AVFormatContext *s)
1174 AVIContext *avi = s->priv_data;
1176 for(i=0;i<s->nb_streams;i++) {
1177 AVStream *st = s->streams[i];
1178 av_free(st->codec->palctrl);
1182 av_free(avi->dv_demux);
1187 static int avi_probe(AVProbeData *p)
1191 /* check file header */
1192 for(i=0; avi_headers[i][0]; i++)
1193 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1194 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1195 return AVPROBE_SCORE_MAX;
1200 AVInputFormat avi_demuxer = {
1202 NULL_IF_CONFIG_SMALL("AVI format"),
1209 .metadata_conv = ff_avi_metadata_conv,