3 * Copyright (c) 2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 typedef struct AVIStream {
30 int64_t frame_offset; /* current frame (video) or byte (audio) counter
31 (used to compute the pts) */
37 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
40 int64_t cum_len; /* temporary storage (used during seek) */
42 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
54 DVDemuxContext* dv_demux;
57 static int avi_load_index(AVFormatContext *s);
58 static int guess_ni_flag(AVFormatContext *s);
61 static void print_tag(const char *str, unsigned int tag, int size)
63 printf("%s: tag=%c%c%c%c size=0x%x\n",
72 static int get_riff(AVIContext *avi, ByteIOContext *pb)
75 /* check RIFF header */
78 if (tag != MKTAG('R', 'I', 'F', 'F'))
80 avi->riff_end = get_le32(pb); /* RIFF chunk size */
81 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
83 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
89 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
90 AVIContext *avi = s->priv_data;
91 ByteIOContext *pb = &s->pb;
92 int longs_pre_entry= get_le16(pb);
93 int index_sub_type = get_byte(pb);
94 int index_type = get_byte(pb);
95 int entries_in_use = get_le32(pb);
96 int chunk_id = get_le32(pb);
97 int64_t base = get_le64(pb);
98 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
102 int64_t last_pos= -1;
104 // av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n",
105 // longs_pre_entry,index_type, entries_in_use, chunk_id, base);
107 if(stream_id > s->nb_streams || stream_id < 0)
109 st= s->streams[stream_id];
117 if(index_type && longs_pre_entry != 2)
122 for(i=0; i<entries_in_use; i++){
124 int64_t pos= get_le32(pb) + base - 8;
125 int len = get_le32(pb);
129 //av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len);
130 if(last_pos == pos || pos == base - 8)
131 avi->non_interleaved= 1;
133 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
136 ast->cum_len += len / ast->sample_size;
141 int64_t offset= get_le64(pb);
142 int size = get_le32(pb);
143 int duration = get_le32(pb);
144 int64_t pos= url_ftell(pb);
146 url_fseek(pb, offset+8, SEEK_SET);
147 read_braindead_odml_indx(s, frame_num);
148 frame_num += duration;
150 url_fseek(pb, pos, SEEK_SET);
156 static void clean_index(AVFormatContext *s){
159 for(i=0; i<s->nb_streams; i++){
160 AVStream *st = s->streams[i];
161 AVIStream *ast = st->priv_data;
162 int n= st->nb_index_entries;
163 int max= ast->sample_size;
164 int64_t pos, size, ts;
166 if(n != 1 || ast->sample_size==0)
169 while(max < 1024) max+=max;
171 pos= st->index_entries[0].pos;
172 size= st->index_entries[0].size;
173 ts= st->index_entries[0].timestamp;
175 for(j=0; j<size; j+=max){
176 av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
181 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
183 AVIContext *avi = s->priv_data;
184 ByteIOContext *pb = &s->pb;
185 uint32_t tag, tag1, handler;
186 int codec_type, stream_index, frame_period, bit_rate;
187 unsigned int size, nb_frames;
191 int xan_video = 0; /* hack to support Xan A/V */
193 avi->stream_index= -1;
195 if (get_riff(avi, pb) < 0)
208 print_tag("tag", tag, size);
212 case MKTAG('L', 'I', 'S', 'T'):
213 /* ignored, except when start of video packets */
216 print_tag("list", tag1, 0);
218 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
219 avi->movi_list = url_ftell(pb) - 4;
220 if(size) avi->movi_end = avi->movi_list + size;
221 else avi->movi_end = url_fsize(pb);
223 printf("movi end=%Lx\n", avi->movi_end);
228 case MKTAG('d', 'm', 'l', 'h'):
230 url_fskip(pb, size + (size & 1));
232 case MKTAG('a', 'v', 'i', 'h'):
234 /* using frame_period is bad idea */
235 frame_period = get_le32(pb);
236 bit_rate = get_le32(pb) * 8;
238 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
240 url_fskip(pb, 2 * 4);
244 st = av_new_stream(s, i);
248 ast = av_mallocz(sizeof(AVIStream));
253 url_fskip(pb, size - 7 * 4);
255 case MKTAG('s', 't', 'r', 'h'):
259 handler = get_le32(pb); /* codec tag */
261 print_tag("strh", tag1, -1);
263 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
265 * After some consideration -- I don't think we
266 * have to support anything but DV in a type1 AVIs.
268 if (s->nb_streams != 1)
271 if (handler != MKTAG('d', 'v', 's', 'd') &&
272 handler != MKTAG('d', 'v', 'h', 'd') &&
273 handler != MKTAG('d', 'v', 's', 'l'))
276 ast = s->streams[0]->priv_data;
277 av_freep(&s->streams[0]->codec->extradata);
278 av_freep(&s->streams[0]);
280 avi->dv_demux = dv_init_demux(s);
283 s->streams[0]->priv_data = ast;
284 url_fskip(pb, 3 * 4);
285 ast->scale = get_le32(pb);
286 ast->rate = get_le32(pb);
287 stream_index = s->nb_streams - 1;
288 url_fskip(pb, size - 7*4);
292 if (stream_index >= s->nb_streams) {
293 url_fskip(pb, size - 8);
296 st = s->streams[stream_index];
298 st->codec->stream_codec_tag= handler;
300 get_le32(pb); /* flags */
301 get_le16(pb); /* priority */
302 get_le16(pb); /* language */
303 get_le32(pb); /* initial frame */
304 ast->scale = get_le32(pb);
305 ast->rate = get_le32(pb);
306 if(ast->scale && ast->rate){
307 }else if(frame_period){
309 ast->scale = frame_period;
314 av_set_pts_info(st, 64, ast->scale, ast->rate);
316 ast->start= get_le32(pb); /* start */
317 nb_frames = get_le32(pb);
320 st->duration = nb_frames;
321 get_le32(pb); /* buffer size */
322 get_le32(pb); /* quality */
323 ast->sample_size = get_le32(pb); /* sample ssize */
324 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
327 case MKTAG('v', 'i', 'd', 's'):
328 codec_type = CODEC_TYPE_VIDEO;
330 ast->sample_size = 0;
332 case MKTAG('a', 'u', 'd', 's'):
333 codec_type = CODEC_TYPE_AUDIO;
335 case MKTAG('t', 'x', 't', 's'):
337 codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
339 case MKTAG('p', 'a', 'd', 's'):
340 codec_type = CODEC_TYPE_UNKNOWN;
344 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
347 url_fskip(pb, size - 12 * 4);
349 case MKTAG('s', 't', 'r', 'f'):
351 if (stream_index >= s->nb_streams || avi->dv_demux) {
354 st = s->streams[stream_index];
356 case CODEC_TYPE_VIDEO:
357 get_le32(pb); /* size */
358 st->codec->width = get_le32(pb);
359 st->codec->height = get_le32(pb);
360 get_le16(pb); /* panes */
361 st->codec->bits_per_sample= get_le16(pb); /* depth */
363 get_le32(pb); /* ImageSize */
364 get_le32(pb); /* XPelsPerMeter */
365 get_le32(pb); /* YPelsPerMeter */
366 get_le32(pb); /* ClrUsed */
367 get_le32(pb); /* ClrImportant */
369 if(size > 10*4 && size<(1<<30)){
370 st->codec->extradata_size= size - 10*4;
371 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
372 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
375 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
378 /* Extract palette from extradata if bpp <= 8 */
379 /* This code assumes that extradata contains only palette */
380 /* This is true for all paletted codecs implemented in ffmpeg */
381 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
382 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
383 #ifdef WORDS_BIGENDIAN
384 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
385 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
387 memcpy(st->codec->palctrl->palette, st->codec->extradata,
388 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
390 st->codec->palctrl->palette_changed = 1;
394 print_tag("video", tag1, 0);
396 st->codec->codec_type = CODEC_TYPE_VIDEO;
397 st->codec->codec_tag = tag1;
398 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
399 if (st->codec->codec_id == CODEC_ID_XAN_WC4)
401 st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts
402 // url_fskip(pb, size - 5 * 4);
404 case CODEC_TYPE_AUDIO:
405 get_wav_header(pb, st->codec, size);
406 if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
407 av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
408 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
410 /* special case time: To support Xan DPCM, hardcode
411 * the format if Xxan is the video codec */
412 st->need_parsing = 1;
413 /* force parsing as several audio frames can be in
416 st->codec->codec_id = CODEC_ID_XAN_DPCM;
419 st->codec->codec_type = CODEC_TYPE_DATA;
420 st->codec->codec_id= CODEC_ID_NONE;
421 st->codec->codec_tag= 0;
427 case MKTAG('i', 'n', 'd', 'x'):
429 read_braindead_odml_indx(s, 0);
431 url_fseek(pb, i+size, SEEK_SET);
441 /* check stream number */
442 if (stream_index != s->nb_streams - 1) {
444 for(i=0;i<s->nb_streams;i++) {
445 av_freep(&s->streams[i]->codec->extradata);
446 av_freep(&s->streams[i]);
451 if(!avi->index_loaded)
453 avi->index_loaded = 1;
454 avi->non_interleaved |= guess_ni_flag(s);
455 if(avi->non_interleaved)
461 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
463 AVIContext *avi = s->priv_data;
464 ByteIOContext *pb = &s->pb;
470 size = dv_get_packet(avi->dv_demux, pkt);
475 if(avi->non_interleaved){
476 int best_stream_index = 0;
477 AVStream *best_st= NULL;
479 int64_t best_ts= INT64_MAX;
482 for(i=0; i<s->nb_streams; i++){
483 AVStream *st = s->streams[i];
484 AVIStream *ast = st->priv_data;
485 int64_t ts= ast->frame_offset;
488 ts /= ast->sample_size;
489 ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
491 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
495 best_stream_index= i;
498 best_ast = best_st->priv_data;
499 best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
500 if(best_ast->remaining)
501 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
503 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
505 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
507 int64_t pos= best_st->index_entries[i].pos;
508 pos += best_ast->packet_size - best_ast->remaining;
509 url_fseek(&s->pb, pos + 8, SEEK_SET);
510 // av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
512 assert(best_ast->remaining <= best_ast->packet_size);
514 avi->stream_index= best_stream_index;
515 if(!best_ast->remaining)
516 best_ast->packet_size=
517 best_ast->remaining= best_st->index_entries[i].size;
522 if(avi->stream_index >= 0){
523 AVStream *st= s->streams[ avi->stream_index ];
524 AVIStream *ast= st->priv_data;
527 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
529 else if(ast->sample_size < 32)
530 size= 64*ast->sample_size;
532 size= ast->sample_size;
534 if(size > ast->remaining)
535 size= ast->remaining;
536 av_get_packet(pb, pkt, size);
539 dstr = pkt->destruct;
540 size = dv_produce_packet(avi->dv_demux, pkt,
541 pkt->data, pkt->size);
542 pkt->destruct = dstr;
543 pkt->flags |= PKT_FLAG_KEY;
545 /* XXX: how to handle B frames in avi ? */
546 pkt->dts = ast->frame_offset;
547 // pkt->dts += ast->start;
549 pkt->dts /= ast->sample_size;
550 //av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%Ld %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);
551 pkt->stream_index = avi->stream_index;
553 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
554 if(st->index_entries){
558 index= av_index_search_timestamp(st, pkt->dts, 0);
559 e= &st->index_entries[index];
561 if(index >= 0 && e->timestamp == ast->frame_offset){
562 if (e->flags & AVINDEX_KEYFRAME)
563 pkt->flags |= PKT_FLAG_KEY;
566 /* if no index, better to say that all frames
568 pkt->flags |= PKT_FLAG_KEY;
571 pkt->flags |= PKT_FLAG_KEY;
574 ast->frame_offset += pkt->size;
578 ast->remaining -= size;
580 avi->stream_index= -1;
591 memset(d, -1, sizeof(int)*8);
592 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
595 if (i >= avi->movi_end) {
597 url_fskip(pb, avi->riff_end - i);
598 avi->riff_end = avi->movi_end = url_fsize(pb);
607 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
609 if( d[2] >= '0' && d[2] <= '9'
610 && d[3] >= '0' && d[3] <= '9'){
611 n= (d[2] - '0') * 10 + (d[3] - '0');
613 n= 100; //invalid stream id
615 //av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
616 if(i + size > avi->movi_end || d[0]<0)
620 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
622 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
624 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
628 if( d[0] >= '0' && d[0] <= '9'
629 && d[1] >= '0' && d[1] <= '9'){
630 n= (d[0] - '0') * 10 + (d[1] - '0');
632 n= 100; //invalid stream id
636 if(n < s->nb_streams){
642 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
643 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
644 || st->discard >= AVDISCARD_ALL){
645 if(ast->sample_size) ast->frame_offset += pkt->size;
646 else ast->frame_offset++;
651 if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
652 d[2]*256+d[3] == ast->prefix /*||
653 (d[2] == 'd' && d[3] == 'c') ||
654 (d[2] == 'w' && d[3] == 'b')*/) {
656 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
657 if(d[2]*256+d[3] == ast->prefix)
660 ast->prefix= d[2]*256+d[3];
661 ast->prefix_count= 0;
664 avi->stream_index= n;
665 ast->packet_size= size + 8;
666 ast->remaining= size;
670 /* palette changed chunk */
671 if ( d[0] >= '0' && d[0] <= '9'
672 && d[1] >= '0' && d[1] <= '9'
673 && ((d[2] == 'p' && d[3] == 'c'))
674 && n < s->nb_streams && i + size <= avi->movi_end) {
677 int first, clr, flags, k, p;
681 first = get_byte(pb);
683 if(!clr) /* all 256 colors used */
685 flags = get_le16(pb);
687 for (k = first; k < clr + first; k++) {
693 st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
695 st->codec->palctrl->palette_changed = 1;
704 /* XXX: we make the implicit supposition that the position are sorted
706 static int avi_read_idx1(AVFormatContext *s, int size)
708 AVIContext *avi = s->priv_data;
709 ByteIOContext *pb = &s->pb;
710 int nb_index_entries, i;
713 unsigned int index, tag, flags, pos, len;
714 unsigned last_pos= -1;
716 nb_index_entries = size / 16;
717 if (nb_index_entries <= 0)
720 /* read the entries and sort them in each stream component */
721 for(i = 0; i < nb_index_entries; i++) {
723 flags = get_le32(pb);
726 #if defined(DEBUG_SEEK)
727 av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
728 i, tag, flags, pos, len);
730 if(i==0 && pos > avi->movi_list)
731 avi->movi_list= 0; //FIXME better check
732 pos += avi->movi_list;
734 index = ((tag & 0xff) - '0') * 10;
735 index += ((tag >> 8) & 0xff) - '0';
736 if (index >= s->nb_streams)
738 st = s->streams[index];
741 #if defined(DEBUG_SEEK)
742 av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
745 avi->non_interleaved= 1;
747 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
749 ast->cum_len += len / ast->sample_size;
757 static int guess_ni_flag(AVFormatContext *s){
759 int64_t last_start=0;
760 int64_t first_end= INT64_MAX;
762 for(i=0; i<s->nb_streams; i++){
763 AVStream *st = s->streams[i];
764 int n= st->nb_index_entries;
769 if(st->index_entries[0].pos > last_start)
770 last_start= st->index_entries[0].pos;
771 if(st->index_entries[n-1].pos < first_end)
772 first_end= st->index_entries[n-1].pos;
774 return last_start > first_end;
777 static int avi_load_index(AVFormatContext *s)
779 AVIContext *avi = s->priv_data;
780 ByteIOContext *pb = &s->pb;
782 offset_t pos= url_ftell(pb);
784 url_fseek(pb, avi->movi_end, SEEK_SET);
786 printf("movi_end=0x%llx\n", avi->movi_end);
794 printf("tag=%c%c%c%c size=0x%x\n",
802 case MKTAG('i', 'd', 'x', '1'):
803 if (avi_read_idx1(s, size) < 0)
816 url_fseek(pb, pos, SEEK_SET);
820 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
822 AVIContext *avi = s->priv_data;
827 if (!avi->index_loaded) {
828 /* we only load the index on demand */
830 avi->index_loaded = 1;
832 assert(stream_index>= 0);
834 st = s->streams[stream_index];
835 index= av_index_search_timestamp(st, timestamp, flags);
839 /* find the position */
840 pos = st->index_entries[index].pos;
841 timestamp = st->index_entries[index].timestamp;
843 // av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
845 for(i = 0; i < s->nb_streams; i++) {
846 AVStream *st2 = s->streams[i];
847 AVIStream *ast2 = st2->priv_data;
852 if (st2->nb_index_entries <= 0)
855 // assert(st2->codec->block_align);
856 assert(st2->time_base.den == ast2->rate);
857 assert(st2->time_base.num == ast2->scale);
858 index = av_index_search_timestamp(
860 av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
861 flags | AVSEEK_FLAG_BACKWARD);
865 if(!avi->non_interleaved){
866 while(index>0 && st2->index_entries[index].pos > pos)
868 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
872 // av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
873 /* extract the current frame number */
874 ast2->frame_offset = st2->index_entries[index].timestamp;
875 if(ast2->sample_size)
876 ast2->frame_offset *=ast2->sample_size;
880 dv_flush_audio_packets(avi->dv_demux);
882 url_fseek(&s->pb, pos, SEEK_SET);
883 avi->stream_index= -1;
887 static int avi_read_close(AVFormatContext *s)
890 AVIContext *avi = s->priv_data;
892 for(i=0;i<s->nb_streams;i++) {
893 AVStream *st = s->streams[i];
894 AVIStream *ast = st->priv_data;
896 av_free(st->codec->extradata);
897 av_free(st->codec->palctrl);
901 av_free(avi->dv_demux);
906 static int avi_probe(AVProbeData *p)
908 /* check file header */
909 if (p->buf_size <= 32)
911 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
912 p->buf[2] == 'F' && p->buf[3] == 'F' &&
913 p->buf[8] == 'A' && p->buf[9] == 'V' &&
914 p->buf[10] == 'I' && p->buf[11] == ' ')
915 return AVPROBE_SCORE_MAX;
920 static AVInputFormat avi_iformat = {
931 int avidec_init(void)
933 av_register_input_format(&avi_iformat);