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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/bswap.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/avassert.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
53 AVFormatContext *sub_ctx;
71 DVDemuxContext* dv_demux;
74 #define MAX_ODML_DEPTH 1000
79 static const AVOption options[] = {
80 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
84 static const AVClass demuxer_class = {
86 .item_name = av_default_item_name,
88 .version = LIBAVUTIL_VERSION_INT,
89 .category = AV_CLASS_CATEGORY_DEMUXER,
93 static const char avi_headers[][8] = {
94 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
95 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
96 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
97 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
98 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
102 static const AVMetadataConv avi_metadata_conv[] = {
107 static int avi_load_index(AVFormatContext *s);
108 static int guess_ni_flag(AVFormatContext *s);
110 #define print_tag(str, tag, size) \
111 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
114 (tag >> 16) & 0xff, \
115 (tag >> 24) & 0xff, \
118 static inline int get_duration(AVIStream *ast, int len){
119 if(ast->sample_size){
121 }else if (ast->dshow_block_align){
122 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
127 static int get_riff(AVFormatContext *s, AVIOContext *pb)
129 AVIContext *avi = s->priv_data;
133 /* check RIFF header */
134 avio_read(pb, header, 4);
135 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
136 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
137 avio_read(pb, header+4, 4);
139 for(i=0; avi_headers[i][0]; i++)
140 if(!memcmp(header, avi_headers[i], 8))
142 if(!avi_headers[i][0])
143 return AVERROR_INVALIDDATA;
145 if(header[7] == 0x19)
146 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
151 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
152 AVIContext *avi = s->priv_data;
153 AVIOContext *pb = s->pb;
154 int longs_pre_entry= avio_rl16(pb);
155 int index_sub_type = avio_r8(pb);
156 int index_type = avio_r8(pb);
157 int entries_in_use = avio_rl32(pb);
158 int chunk_id = avio_rl32(pb);
159 int64_t base = avio_rl64(pb);
160 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
164 int64_t last_pos= -1;
165 int64_t filesize= avi->fsize;
167 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
168 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
170 if(stream_id >= s->nb_streams || stream_id < 0)
171 return AVERROR_INVALIDDATA;
172 st= s->streams[stream_id];
176 return AVERROR_INVALIDDATA;
180 if(index_type && longs_pre_entry != 2)
181 return AVERROR_INVALIDDATA;
183 return AVERROR_INVALIDDATA;
185 if(filesize > 0 && base >= filesize){
186 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
187 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
190 return AVERROR_INVALIDDATA;
193 for(i=0; i<entries_in_use; i++){
195 int64_t pos= avio_rl32(pb) + base - 8;
196 int len = avio_rl32(pb);
201 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
204 return AVERROR_INVALIDDATA;
206 if(last_pos == pos || pos == base - 8)
207 avi->non_interleaved= 1;
208 if(last_pos != pos && (len || !ast->sample_size))
209 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
211 ast->cum_len += get_duration(ast, len);
216 offset = avio_rl64(pb);
217 avio_rl32(pb); /* size */
218 duration = avio_rl32(pb);
221 return AVERROR_INVALIDDATA;
225 if(avi->odml_depth > MAX_ODML_DEPTH){
226 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
227 return AVERROR_INVALIDDATA;
230 if(avio_seek(pb, offset+8, SEEK_SET) < 0)
233 read_braindead_odml_indx(s, frame_num);
235 frame_num += duration;
237 if(avio_seek(pb, pos, SEEK_SET) < 0) {
238 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
248 static void clean_index(AVFormatContext *s){
252 for(i=0; i<s->nb_streams; i++){
253 AVStream *st = s->streams[i];
254 AVIStream *ast = st->priv_data;
255 int n= st->nb_index_entries;
256 int max= ast->sample_size;
257 int64_t pos, size, ts;
259 if(n != 1 || ast->sample_size==0)
262 while(max < 1024) max+=max;
264 pos= st->index_entries[0].pos;
265 size= st->index_entries[0].size;
266 ts= st->index_entries[0].timestamp;
268 for(j=0; j<size; j+=max){
269 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
274 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
276 AVIOContext *pb = s->pb;
277 char key[5] = {0}, *value;
281 if (size == UINT_MAX)
282 return AVERROR(EINVAL);
283 value = av_malloc(size+1);
285 return AVERROR(ENOMEM);
286 avio_read(pb, value, size);
291 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
292 AV_DICT_DONT_STRDUP_VAL);
295 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
296 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
298 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
300 char month[4], time[9], buffer[64];
302 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
303 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
304 month, &day, time, &year) == 4) {
306 if (!av_strcasecmp(month, months[i])) {
307 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
308 year, i+1, day, time);
309 av_dict_set(metadata, "creation_time", buffer, 0);
311 } else if (date[4] == '/' && date[7] == '/') {
312 date[4] = date[7] = '-';
313 av_dict_set(metadata, "creation_time", date, 0);
317 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
319 while (avio_tell(s->pb) < end) {
320 uint32_t tag = avio_rl32(s->pb);
321 uint32_t size = avio_rl32(s->pb);
323 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
324 uint64_t tag_end = avio_tell(s->pb) + size;
325 while (avio_tell(s->pb) < tag_end) {
326 uint16_t tag = avio_rl16(s->pb);
327 uint16_t size = avio_rl16(s->pb);
328 const char *name = NULL;
329 char buffer[64] = {0};
330 size -= avio_read(s->pb, buffer,
331 FFMIN(size, sizeof(buffer)-1));
333 case 0x03: name = "maker"; break;
334 case 0x04: name = "model"; break;
335 case 0x13: name = "creation_time";
336 if (buffer[4] == ':' && buffer[7] == ':')
337 buffer[4] = buffer[7] = '-';
341 av_dict_set(&s->metadata, name, buffer, 0);
342 avio_skip(s->pb, size);
347 avio_skip(s->pb, size);
353 static int avi_read_header(AVFormatContext *s)
355 AVIContext *avi = s->priv_data;
356 AVIOContext *pb = s->pb;
357 unsigned int tag, tag1, handler;
358 int codec_type, stream_index, frame_period;
362 AVIStream *ast = NULL;
363 int avih_width=0, avih_height=0;
364 int amv_file_format=0;
365 uint64_t list_end = 0;
368 avi->stream_index= -1;
370 ret = get_riff(s, pb);
374 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
376 avi->fsize = avio_size(pb);
377 if(avi->fsize<=0 || avi->fsize < avi->riff_end)
378 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
388 size = avio_rl32(pb);
390 print_tag("tag", tag, size);
393 case MKTAG('L', 'I', 'S', 'T'):
394 list_end = avio_tell(pb) + size;
395 /* Ignored, except at start of video packets. */
396 tag1 = avio_rl32(pb);
398 print_tag("list", tag1, 0);
400 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
401 avi->movi_list = avio_tell(pb) - 4;
402 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
403 else avi->movi_end = avi->fsize;
404 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
407 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
408 ff_read_riff_info(s, size - 4);
409 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
410 avi_read_nikon(s, list_end);
413 case MKTAG('I', 'D', 'I', 'T'): {
414 unsigned char date[64] = {0};
416 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
418 avi_metadata_creation_time(&s->metadata, date);
421 case MKTAG('d', 'm', 'l', 'h'):
423 avio_skip(pb, size + (size & 1));
425 case MKTAG('a', 'm', 'v', 'h'):
427 case MKTAG('a', 'v', 'i', 'h'):
429 /* using frame_period is bad idea */
430 frame_period = avio_rl32(pb);
431 avio_rl32(pb); /* max. bytes per second */
433 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
435 avio_skip(pb, 2 * 4);
438 avih_width=avio_rl32(pb);
439 avih_height=avio_rl32(pb);
441 avio_skip(pb, size - 10 * 4);
443 case MKTAG('s', 't', 'r', 'h'):
446 tag1 = avio_rl32(pb);
447 handler = avio_rl32(pb); /* codec tag */
449 if(tag1 == MKTAG('p', 'a', 'd', 's')){
450 avio_skip(pb, size - 8);
454 st = avformat_new_stream(s, NULL);
458 st->id = stream_index;
459 ast = av_mallocz(sizeof(AVIStream));
465 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
467 print_tag("strh", tag1, -1);
469 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
473 * After some consideration -- I don't think we
474 * have to support anything but DV in type1 AVIs.
476 if (s->nb_streams != 1)
479 if (handler != MKTAG('d', 'v', 's', 'd') &&
480 handler != MKTAG('d', 'v', 'h', 'd') &&
481 handler != MKTAG('d', 'v', 's', 'l'))
484 ast = s->streams[0]->priv_data;
485 av_freep(&s->streams[0]->codec->extradata);
486 av_freep(&s->streams[0]->codec);
487 av_freep(&s->streams[0]->info);
488 av_freep(&s->streams[0]);
490 if (CONFIG_DV_DEMUXER) {
491 avi->dv_demux = avpriv_dv_init_demux(s);
495 s->streams[0]->priv_data = ast;
496 avio_skip(pb, 3 * 4);
497 ast->scale = avio_rl32(pb);
498 ast->rate = avio_rl32(pb);
499 avio_skip(pb, 4); /* start time */
501 dv_dur = avio_rl32(pb);
502 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
503 dv_dur *= AV_TIME_BASE;
504 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
507 * else, leave duration alone; timing estimation in utils.c
508 * will make a guess based on bitrate.
511 stream_index = s->nb_streams - 1;
512 avio_skip(pb, size - 9*4);
516 av_assert0(stream_index < s->nb_streams);
517 st->codec->stream_codec_tag= handler;
519 avio_rl32(pb); /* flags */
520 avio_rl16(pb); /* priority */
521 avio_rl16(pb); /* language */
522 avio_rl32(pb); /* initial frame */
523 ast->scale = avio_rl32(pb);
524 ast->rate = avio_rl32(pb);
525 if(!(ast->scale && ast->rate)){
526 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);
529 ast->scale = frame_period;
535 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
537 ast->cum_len=avio_rl32(pb); /* start */
538 st->nb_frames = avio_rl32(pb);
541 avio_rl32(pb); /* buffer size */
542 avio_rl32(pb); /* quality */
543 if (ast->cum_len*ast->scale/ast->rate > 3600) {
544 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
545 return AVERROR_INVALIDDATA;
547 ast->sample_size = avio_rl32(pb); /* sample ssize */
548 ast->cum_len *= FFMAX(1, ast->sample_size);
549 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
550 ast->rate, ast->scale, ast->sample_size);
553 case MKTAG('v', 'i', 'd', 's'):
554 codec_type = AVMEDIA_TYPE_VIDEO;
556 ast->sample_size = 0;
558 case MKTAG('a', 'u', 'd', 's'):
559 codec_type = AVMEDIA_TYPE_AUDIO;
561 case MKTAG('t', 'x', 't', 's'):
562 codec_type = AVMEDIA_TYPE_SUBTITLE;
564 case MKTAG('d', 'a', 't', 's'):
565 codec_type = AVMEDIA_TYPE_DATA;
568 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
570 if(ast->sample_size == 0)
571 st->duration = st->nb_frames;
572 ast->frame_offset= ast->cum_len;
573 avio_skip(pb, size - 12 * 4);
575 case MKTAG('s', 't', 'r', 'f'):
579 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
582 uint64_t cur_pos = avio_tell(pb);
584 if (cur_pos < list_end)
585 size = FFMIN(size, list_end - cur_pos);
586 st = s->streams[stream_index];
588 case AVMEDIA_TYPE_VIDEO:
590 st->codec->width=avih_width;
591 st->codec->height=avih_height;
592 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
593 st->codec->codec_id = AV_CODEC_ID_AMV;
597 tag1 = ff_get_bmp_header(pb, st, &esize);
599 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
600 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
601 st->codec->codec_tag = tag1;
602 st->codec->codec_id = AV_CODEC_ID_XSUB;
606 if(size > 10*4 && size<(1<<30) && size < avi->fsize){
607 if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4;
608 else st->codec->extradata_size= size - 10*4;
609 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
610 if (!st->codec->extradata) {
611 st->codec->extradata_size= 0;
612 return AVERROR(ENOMEM);
614 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
617 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
620 /* Extract palette from extradata if bpp <= 8. */
621 /* This code assumes that extradata contains only palette. */
622 /* This is true for all paletted codecs implemented in FFmpeg. */
623 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
624 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
625 const uint8_t *pal_src;
627 pal_size = FFMIN(pal_size, st->codec->extradata_size);
628 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
629 for (i = 0; i < pal_size/4; i++)
630 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
634 print_tag("video", tag1, 0);
636 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
637 st->codec->codec_tag = tag1;
638 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
639 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
641 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
642 st->codec->extradata_size+= 9;
643 st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
644 if(st->codec->extradata)
645 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
647 st->codec->height= FFABS(st->codec->height);
649 // avio_skip(pb, size - 5 * 4);
651 case AVMEDIA_TYPE_AUDIO:
652 ret = ff_get_wav_header(pb, st->codec, size);
655 ast->dshow_block_align= st->codec->block_align;
656 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
657 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
658 ast->sample_size= st->codec->block_align;
660 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
662 /* Force parsing as several audio frames can be in
663 * one packet and timestamps refer to packet start. */
664 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
665 /* ADTS header is in extradata, AAC without header must be
666 * stored as exact frames. Parser not needed and it will
668 if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size)
669 st->need_parsing = AVSTREAM_PARSE_NONE;
670 /* AVI files with Xan DPCM audio (wrongly) declare PCM
671 * audio in the header but have Axan as stream_code_tag. */
672 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
673 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
674 st->codec->codec_tag = 0;
675 ast->dshow_block_align = 0;
677 if (amv_file_format){
678 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
679 ast->dshow_block_align = 0;
681 if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
682 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
683 ast->dshow_block_align = 0;
685 if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
686 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
687 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
688 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
689 ast->sample_size = 0;
692 case AVMEDIA_TYPE_SUBTITLE:
693 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
694 st->request_probe= 1;
698 st->codec->codec_type = AVMEDIA_TYPE_DATA;
699 st->codec->codec_id= AV_CODEC_ID_NONE;
700 st->codec->codec_tag= 0;
706 case MKTAG('s', 't', 'r', 'd'):
707 if (stream_index >= (unsigned)s->nb_streams || s->streams[stream_index]->codec->extradata_size) {
710 uint64_t cur_pos = avio_tell(pb);
711 if (cur_pos < list_end)
712 size = FFMIN(size, list_end - cur_pos);
713 st = s->streams[stream_index];
716 st->codec->extradata_size= size;
717 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
718 if (!st->codec->extradata) {
719 st->codec->extradata_size= 0;
720 return AVERROR(ENOMEM);
722 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
725 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
729 case MKTAG('i', 'n', 'd', 'x'):
731 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&
732 read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE))
734 avio_seek(pb, i+size, SEEK_SET);
736 case MKTAG('v', 'p', 'r', 'p'):
737 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
738 AVRational active, active_aspect;
740 st = s->streams[stream_index];
747 active_aspect.den= avio_rl16(pb);
748 active_aspect.num= avio_rl16(pb);
749 active.num = avio_rl32(pb);
750 active.den = avio_rl32(pb);
751 avio_rl32(pb); //nbFieldsPerFrame
753 if(active_aspect.num && active_aspect.den && active.num && active.den){
754 st->sample_aspect_ratio= av_div_q(active_aspect, active);
755 av_dlog(s, "vprp %d/%d %d/%d\n",
756 active_aspect.num, active_aspect.den,
757 active.num, active.den);
763 case MKTAG('s', 't', 'r', 'n'):
765 ret = avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
772 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
773 "I will ignore it and try to continue anyway.\n");
774 if (s->error_recognition & AV_EF_EXPLODE)
776 avi->movi_list = avio_tell(pb) - 4;
777 avi->movi_end = avi->fsize;
787 /* check stream number */
788 if (stream_index != s->nb_streams - 1) {
790 return AVERROR_INVALIDDATA;
793 if(!avi->index_loaded && pb->seekable)
795 avi->index_loaded |= 1;
796 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
797 for(i=0; i<s->nb_streams; i++){
798 AVStream *st = s->streams[i];
799 if(st->nb_index_entries)
802 // DV-in-AVI cannot be non-interleaved, if set this must be
805 avi->non_interleaved=0;
806 if(i==s->nb_streams && avi->non_interleaved) {
807 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
808 avi->non_interleaved=0;
811 if(avi->non_interleaved) {
812 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
816 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
817 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
822 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
823 if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
825 int score = AVPROBE_SCORE_MAX / 2, ret;
826 AVIStream *ast = st->priv_data;
827 AVInputFormat *sub_demuxer;
828 AVRational time_base;
829 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
831 0, NULL, NULL, NULL, NULL);
833 unsigned int desc_len = avio_rl32(pb);
835 if (desc_len > pb->buf_end - pb->buf_ptr)
838 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
839 avio_skip(pb, desc_len - ret);
841 av_dict_set(&st->metadata, "title", desc, 0);
843 avio_rl16(pb); /* flags? */
844 avio_rl32(pb); /* data size */
846 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
847 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
850 if (!(ast->sub_ctx = avformat_alloc_context()))
853 ast->sub_ctx->pb = pb;
854 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
855 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
856 *st->codec = *ast->sub_ctx->streams[0]->codec;
857 ast->sub_ctx->streams[0]->codec->extradata = NULL;
858 time_base = ast->sub_ctx->streams[0]->time_base;
859 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
861 ast->sub_buffer = pkt->data;
862 memset(pkt, 0, sizeof(*pkt));
870 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
873 AVIStream *ast, *next_ast = next_st->priv_data;
874 int64_t ts, next_ts, ts_min = INT64_MAX;
875 AVStream *st, *sub_st = NULL;
878 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
881 for (i=0; i<s->nb_streams; i++) {
884 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
885 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
886 if (ts <= next_ts && ts < ts_min) {
894 ast = sub_st->priv_data;
896 pkt->stream_index = sub_st->index;
897 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
898 ast->sub_pkt.data = NULL;
903 static int get_stream_idx(int *d){
904 if( d[0] >= '0' && d[0] <= '9'
905 && d[1] >= '0' && d[1] <= '9'){
906 return (d[0] - '0') * 10 + (d[1] - '0');
908 return 100; //invalid stream ID
914 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
916 static int avi_sync(AVFormatContext *s, int exit_early)
918 AVIContext *avi = s->priv_data;
919 AVIOContext *pb = s->pb;
926 memset(d, -1, sizeof(d));
927 for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
934 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
936 n= get_stream_idx(d+2);
937 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
938 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
939 if(i + (uint64_t)size > avi->fsize || d[0] > 127)
943 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
945 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
946 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
952 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
957 n= get_stream_idx(d);
959 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
962 //detect ##ix chunk and skip
963 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
969 if(n < s->nb_streams){
976 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
980 if(s->nb_streams>=2){
981 AVStream *st1 = s->streams[1];
982 AVIStream *ast1= st1->priv_data;
983 //workaround for broken small-file-bug402.avi
984 if( d[2] == 'w' && d[3] == 'b'
986 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
987 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
988 && ast->prefix == 'd'*256+'c'
989 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
994 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
999 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1000 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1001 || st->discard >= AVDISCARD_ALL){
1003 ast->frame_offset += get_duration(ast, size);
1005 avio_skip(pb, size);
1009 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1010 int k = avio_r8(pb);
1011 int last = (k + avio_r8(pb) - 1) & 0xFF;
1013 avio_rl16(pb); //flags
1015 for (; k <= last; k++)
1016 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1019 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1020 d[2]*256+d[3] == ast->prefix /*||
1021 (d[2] == 'd' && d[3] == 'c') ||
1022 (d[2] == 'w' && d[3] == 'b')*/) {
1026 if(d[2]*256+d[3] == ast->prefix)
1027 ast->prefix_count++;
1029 ast->prefix= d[2]*256+d[3];
1030 ast->prefix_count= 0;
1033 avi->stream_index= n;
1034 ast->packet_size= size + 8;
1035 ast->remaining= size;
1037 if(size || !ast->sample_size){
1038 uint64_t pos= avio_tell(pb) - 8;
1039 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1040 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1053 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1055 AVIContext *avi = s->priv_data;
1056 AVIOContext *pb = s->pb;
1060 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1061 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1066 if(avi->non_interleaved){
1067 int best_stream_index = 0;
1068 AVStream *best_st= NULL;
1069 AVIStream *best_ast;
1070 int64_t best_ts= INT64_MAX;
1073 for(i=0; i<s->nb_streams; i++){
1074 AVStream *st = s->streams[i];
1075 AVIStream *ast = st->priv_data;
1076 int64_t ts= ast->frame_offset;
1079 if(!st->nb_index_entries)
1082 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1083 if(!ast->remaining && ts > last_ts)
1086 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
1088 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1089 st->time_base.num, st->time_base.den, ast->frame_offset);
1093 best_stream_index= i;
1099 best_ast = best_st->priv_data;
1100 best_ts = best_ast->frame_offset;
1101 if(best_ast->remaining)
1102 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
1104 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1106 best_ast->frame_offset= best_st->index_entries[i].timestamp;
1110 int64_t pos= best_st->index_entries[i].pos;
1111 pos += best_ast->packet_size - best_ast->remaining;
1112 if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1115 av_assert0(best_ast->remaining <= best_ast->packet_size);
1117 avi->stream_index= best_stream_index;
1118 if(!best_ast->remaining)
1119 best_ast->packet_size=
1120 best_ast->remaining= best_st->index_entries[i].size;
1127 if(avi->stream_index >= 0){
1128 AVStream *st= s->streams[ avi->stream_index ];
1129 AVIStream *ast= st->priv_data;
1132 if(get_subtitle_pkt(s, st, pkt))
1135 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1137 else if(ast->sample_size < 32)
1138 // arbitrary multiplier to avoid tiny packets for raw PCM data
1139 size= 1024*ast->sample_size;
1141 size= ast->sample_size;
1143 if(size > ast->remaining)
1144 size= ast->remaining;
1145 avi->last_pkt_pos= avio_tell(pb);
1146 err= av_get_packet(pb, pkt, size);
1151 if(ast->has_pal && pkt->size<(unsigned)INT_MAX/2){
1153 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
1155 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
1157 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1162 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1163 dstr = pkt->destruct;
1164 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1165 pkt->data, pkt->size, pkt->pos);
1166 pkt->destruct = dstr;
1167 pkt->flags |= AV_PKT_FLAG_KEY;
1169 av_free_packet(pkt);
1170 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
1171 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1172 ast->frame_offset++;
1173 avi->stream_index = -1;
1177 /* XXX: How to handle B-frames in AVI? */
1178 pkt->dts = ast->frame_offset;
1179 // pkt->dts += ast->start;
1180 if(ast->sample_size)
1181 pkt->dts /= ast->sample_size;
1182 av_dlog(s, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n",
1183 pkt->dts, ast->frame_offset, ast->scale, ast->rate,
1184 ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
1185 pkt->stream_index = avi->stream_index;
1187 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1190 av_assert0(st->index_entries);
1192 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1193 e= &st->index_entries[index];
1195 if(index >= 0 && e->timestamp == ast->frame_offset){
1196 if (index == st->nb_index_entries-1){
1200 for(i=0; i<FFMIN(size,256); i++){
1201 if(st->codec->codec_id == AV_CODEC_ID_MPEG4){
1203 key= !(pkt->data[i]&0xC0);
1208 state= (state<<8) + pkt->data[i];
1211 e->flags &= ~AVINDEX_KEYFRAME;
1213 if (e->flags & AVINDEX_KEYFRAME)
1214 pkt->flags |= AV_PKT_FLAG_KEY;
1217 pkt->flags |= AV_PKT_FLAG_KEY;
1219 ast->frame_offset += get_duration(ast, pkt->size);
1221 ast->remaining -= err;
1222 if(!ast->remaining){
1223 avi->stream_index= -1;
1224 ast->packet_size= 0;
1227 if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
1228 av_free_packet(pkt);
1233 if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){
1234 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1236 if(avi->dts_max - dts > 2*AV_TIME_BASE){
1237 avi->non_interleaved= 1;
1238 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1239 }else if(avi->dts_max < dts)
1246 if ((err = avi_sync(s, 0)) < 0)
1251 /* XXX: We make the implicit supposition that the positions are sorted
1253 static int avi_read_idx1(AVFormatContext *s, int size)
1255 AVIContext *avi = s->priv_data;
1256 AVIOContext *pb = s->pb;
1257 int nb_index_entries, i;
1260 unsigned int index, tag, flags, pos, len, first_packet = 1;
1261 unsigned last_pos= -1;
1262 unsigned last_idx= -1;
1263 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1266 nb_index_entries = size / 16;
1267 if (nb_index_entries <= 0)
1268 return AVERROR_INVALIDDATA;
1270 idx1_pos = avio_tell(pb);
1271 avio_seek(pb, avi->movi_list+4, SEEK_SET);
1272 if (avi_sync(s, 1) == 0) {
1273 first_packet_pos = avio_tell(pb) - 8;
1275 avi->stream_index = -1;
1276 avio_seek(pb, idx1_pos, SEEK_SET);
1278 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")){
1279 first_packet_pos = 0;
1280 data_offset = avi->movi_list;
1283 /* Read the entries and sort them in each stream component. */
1284 for(i = 0; i < nb_index_entries; i++) {
1288 tag = avio_rl32(pb);
1289 flags = avio_rl32(pb);
1290 pos = avio_rl32(pb);
1291 len = avio_rl32(pb);
1292 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1293 i, tag, flags, pos, len);
1295 index = ((tag & 0xff) - '0') * 10;
1296 index += ((tag >> 8) & 0xff) - '0';
1297 if (index >= s->nb_streams)
1299 st = s->streams[index];
1300 ast = st->priv_data;
1302 if(first_packet && first_packet_pos && len) {
1303 data_offset = first_packet_pos - pos;
1308 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1310 // even if we have only a single stream, we should
1311 // switch to non-interleaved to get correct timestamps
1313 avi->non_interleaved= 1;
1314 if(last_idx != pos && len) {
1315 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1318 ast->cum_len += get_duration(ast, len);
1320 anykey |= flags&AVIIF_INDEX;
1323 for (index = 0; index < s->nb_streams; index++) {
1324 st = s->streams[index];
1325 if (st->nb_index_entries)
1326 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1332 static int guess_ni_flag(AVFormatContext *s){
1334 int64_t last_start=0;
1335 int64_t first_end= INT64_MAX;
1336 int64_t oldpos= avio_tell(s->pb);
1338 int64_t min_pos, pos;
1340 for(i=0; i<s->nb_streams; i++){
1341 AVStream *st = s->streams[i];
1342 int n= st->nb_index_entries;
1349 int64_t pos= st->index_entries[0].pos;
1350 avio_seek(s->pb, pos + 4, SEEK_SET);
1351 size= avio_rl32(s->pb);
1352 if(pos + size > st->index_entries[1].pos)
1353 last_start= INT64_MAX;
1356 if(st->index_entries[0].pos > last_start)
1357 last_start= st->index_entries[0].pos;
1358 if(st->index_entries[n-1].pos < first_end)
1359 first_end= st->index_entries[n-1].pos;
1361 avio_seek(s->pb, oldpos, SEEK_SET);
1362 if (last_start > first_end)
1364 idx= av_mallocz(sizeof(*idx) * s->nb_streams);
1365 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
1366 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
1367 min_pos = INT64_MAX;
1369 for (i=0; i<s->nb_streams; i++) {
1370 AVStream *st = s->streams[i];
1371 int n= st->nb_index_entries;
1372 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
1375 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q));
1376 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1379 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q));
1381 if(max_dts - min_dts > 2*AV_TIME_BASE) {
1390 static int avi_load_index(AVFormatContext *s)
1392 AVIContext *avi = s->priv_data;
1393 AVIOContext *pb = s->pb;
1395 int64_t pos= avio_tell(pb);
1399 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1400 goto the_end; // maybe truncated file
1401 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1403 tag = avio_rl32(pb);
1404 size = avio_rl32(pb);
1407 next = avio_tell(pb) + size + (size & 1);
1409 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1416 if (tag == MKTAG('i', 'd', 'x', '1') &&
1417 avi_read_idx1(s, size) >= 0) {
1418 avi->index_loaded=2;
1420 }else if(tag == MKTAG('L', 'I', 'S', 'T')) {
1421 uint32_t tag1 = avio_rl32(pb);
1423 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1424 ff_read_riff_info(s, size - 4);
1428 if (avio_seek(pb, next, SEEK_SET) < 0)
1429 break; // something is wrong here
1432 avio_seek(pb, pos, SEEK_SET);
1436 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1438 AVIStream *ast2 = st2->priv_data;
1439 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1440 av_free_packet(&ast2->sub_pkt);
1441 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1442 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1443 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1446 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1448 AVIContext *avi = s->priv_data;
1451 int64_t pos, pos_min;
1454 if (!avi->index_loaded) {
1455 /* we only load the index on demand */
1457 avi->index_loaded |= 1;
1459 av_assert0(stream_index>= 0);
1461 st = s->streams[stream_index];
1463 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1465 if (st->nb_index_entries > 0)
1466 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1467 timestamp * FFMAX(ast->sample_size, 1),
1468 st->index_entries[0].timestamp,
1469 st->index_entries[st->nb_index_entries - 1].timestamp);
1470 return AVERROR_INVALIDDATA;
1473 /* find the position */
1474 pos = st->index_entries[index].pos;
1475 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1477 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1478 timestamp, index, st->index_entries[index].timestamp);
1480 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1481 /* One and only one real stream for DV in AVI, and it has video */
1482 /* offsets. Calling with other stream indexes should have failed */
1483 /* the av_index_search_timestamp call above. */
1484 av_assert0(stream_index == 0);
1486 if(avio_seek(s->pb, pos, SEEK_SET) < 0)
1489 /* Feed the DV video stream version of the timestamp to the */
1490 /* DV demux so it can synthesize correct timestamps. */
1491 ff_dv_offset_reset(avi->dv_demux, timestamp);
1493 avi->stream_index= -1;
1498 for(i = 0; i < s->nb_streams; i++) {
1499 AVStream *st2 = s->streams[i];
1500 AVIStream *ast2 = st2->priv_data;
1505 if (ast2->sub_ctx) {
1506 seek_subtitle(st, st2, timestamp);
1510 if (st2->nb_index_entries <= 0)
1513 // av_assert1(st2->codec->block_align);
1514 av_assert0((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1515 index = av_index_search_timestamp(
1517 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1518 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1521 ast2->seek_pos= st2->index_entries[index].pos;
1522 pos_min= FFMIN(pos_min,ast2->seek_pos);
1524 for(i = 0; i < s->nb_streams; i++) {
1525 AVStream *st2 = s->streams[i];
1526 AVIStream *ast2 = st2->priv_data;
1528 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1531 index = av_index_search_timestamp(
1533 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1534 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1537 while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1539 ast2->frame_offset = st2->index_entries[index].timestamp;
1543 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1544 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1547 avi->stream_index= -1;
1548 avi->dts_max= INT_MIN;
1552 static int avi_read_close(AVFormatContext *s)
1555 AVIContext *avi = s->priv_data;
1557 for(i=0;i<s->nb_streams;i++) {
1558 AVStream *st = s->streams[i];
1559 AVIStream *ast = st->priv_data;
1562 av_freep(&ast->sub_ctx->pb);
1563 avformat_close_input(&ast->sub_ctx);
1565 av_free(ast->sub_buffer);
1566 av_free_packet(&ast->sub_pkt);
1570 av_free(avi->dv_demux);
1575 static int avi_probe(AVProbeData *p)
1579 /* check file header */
1580 for(i=0; avi_headers[i][0]; i++)
1581 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1582 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1583 return AVPROBE_SCORE_MAX;
1588 AVInputFormat ff_avi_demuxer = {
1590 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1591 .priv_data_size = sizeof(AVIContext),
1592 .read_probe = avi_probe,
1593 .read_header = avi_read_header,
1594 .read_packet = avi_read_packet,
1595 .read_close = avi_read_close,
1596 .read_seek = avi_read_seek,
1597 .priv_class = &demuxer_class,