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
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/bswap.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/dict.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
78 static const AVOption options[] = {
79 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), FF_OPT_TYPE_INT, 1, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
83 static const AVClass demuxer_class = {
87 LIBAVUTIL_VERSION_INT,
91 static const char avi_headers[][8] = {
92 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
93 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
94 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
95 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
96 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
100 static int avi_load_index(AVFormatContext *s);
101 static int guess_ni_flag(AVFormatContext *s);
103 #define print_tag(str, tag, size) \
104 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
107 (tag >> 16) & 0xff, \
108 (tag >> 24) & 0xff, \
111 static inline int get_duration(AVIStream *ast, int len){
112 if(ast->sample_size){
114 }else if (ast->dshow_block_align){
115 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
120 static int get_riff(AVFormatContext *s, AVIOContext *pb)
122 AVIContext *avi = s->priv_data;
126 /* check RIFF header */
127 avio_read(pb, header, 4);
128 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
129 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
130 avio_read(pb, header+4, 4);
132 for(i=0; avi_headers[i][0]; i++)
133 if(!memcmp(header, avi_headers[i], 8))
135 if(!avi_headers[i][0])
138 if(header[7] == 0x19)
139 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
144 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
145 AVIContext *avi = s->priv_data;
146 AVIOContext *pb = s->pb;
147 int longs_pre_entry= avio_rl16(pb);
148 int index_sub_type = avio_r8(pb);
149 int index_type = avio_r8(pb);
150 int entries_in_use = avio_rl32(pb);
151 int chunk_id = avio_rl32(pb);
152 int64_t base = avio_rl64(pb);
153 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
157 int64_t last_pos= -1;
158 int64_t filesize= avio_size(s->pb);
160 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
161 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
163 if(stream_id >= s->nb_streams || stream_id < 0)
165 st= s->streams[stream_id];
173 if(index_type && longs_pre_entry != 2)
178 if(filesize > 0 && base >= filesize){
179 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
180 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
186 for(i=0; i<entries_in_use; i++){
188 int64_t pos= avio_rl32(pb) + base - 8;
189 int len = avio_rl32(pb);
194 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
199 if(last_pos == pos || pos == base - 8)
200 avi->non_interleaved= 1;
201 if(last_pos != pos && (len || !ast->sample_size))
202 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
204 ast->cum_len += get_duration(ast, len);
209 offset = avio_rl64(pb);
210 avio_rl32(pb); /* size */
211 duration = avio_rl32(pb);
218 if(avi->odml_depth > MAX_ODML_DEPTH){
219 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
223 avio_seek(pb, offset+8, SEEK_SET);
225 read_braindead_odml_indx(s, frame_num);
227 frame_num += duration;
229 avio_seek(pb, pos, SEEK_SET);
236 static void clean_index(AVFormatContext *s){
240 for(i=0; i<s->nb_streams; i++){
241 AVStream *st = s->streams[i];
242 AVIStream *ast = st->priv_data;
243 int n= st->nb_index_entries;
244 int max= ast->sample_size;
245 int64_t pos, size, ts;
247 if(n != 1 || ast->sample_size==0)
250 while(max < 1024) max+=max;
252 pos= st->index_entries[0].pos;
253 size= st->index_entries[0].size;
254 ts= st->index_entries[0].timestamp;
256 for(j=0; j<size; j+=max){
257 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
262 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
264 AVIOContext *pb = s->pb;
265 char key[5] = {0}, *value;
269 if (size == UINT_MAX)
271 value = av_malloc(size+1);
274 avio_read(pb, value, size);
279 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
280 AV_DICT_DONT_STRDUP_VAL);
283 static void avi_read_info(AVFormatContext *s, uint64_t end)
285 while (avio_tell(s->pb) < end) {
286 uint32_t tag = avio_rl32(s->pb);
287 uint32_t size = avio_rl32(s->pb);
288 avi_read_tag(s, NULL, tag, size);
292 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
293 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
295 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
297 char month[4], time[9], buffer[64];
299 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
300 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
301 month, &day, time, &year) == 4) {
303 if (!strcasecmp(month, months[i])) {
304 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
305 year, i+1, day, time);
306 av_dict_set(metadata, "creation_time", buffer, 0);
308 } else if (date[4] == '/' && date[7] == '/') {
309 date[4] = date[7] = '-';
310 av_dict_set(metadata, "creation_time", date, 0);
314 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
316 while (avio_tell(s->pb) < end) {
317 uint32_t tag = avio_rl32(s->pb);
318 uint32_t size = avio_rl32(s->pb);
320 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
321 uint64_t tag_end = avio_tell(s->pb) + size;
322 while (avio_tell(s->pb) < tag_end) {
323 uint16_t tag = avio_rl16(s->pb);
324 uint16_t size = avio_rl16(s->pb);
325 const char *name = NULL;
326 char buffer[64] = {0};
327 size -= avio_read(s->pb, buffer,
328 FFMIN(size, sizeof(buffer)-1));
330 case 0x03: name = "maker"; break;
331 case 0x04: name = "model"; break;
332 case 0x13: name = "creation_time";
333 if (buffer[4] == ':' && buffer[7] == ':')
334 buffer[4] = buffer[7] = '-';
338 av_dict_set(&s->metadata, name, buffer, 0);
339 avio_skip(s->pb, size);
344 avio_skip(s->pb, size);
350 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
352 AVIContext *avi = s->priv_data;
353 AVIOContext *pb = s->pb;
354 unsigned int tag, tag1, handler;
355 int codec_type, stream_index, frame_period;
359 AVIStream *ast = NULL;
360 int avih_width=0, avih_height=0;
361 int amv_file_format=0;
362 uint64_t list_end = 0;
365 avi->stream_index= -1;
367 if (get_riff(s, pb) < 0)
370 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
372 avi->fsize = avio_size(pb);
374 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
384 size = avio_rl32(pb);
386 print_tag("tag", tag, size);
389 case MKTAG('L', 'I', 'S', 'T'):
390 list_end = avio_tell(pb) + size;
391 /* Ignored, except at start of video packets. */
392 tag1 = avio_rl32(pb);
394 print_tag("list", tag1, 0);
396 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
397 avi->movi_list = avio_tell(pb) - 4;
398 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
399 else avi->movi_end = avio_size(pb);
400 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
403 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
404 avi_read_info(s, list_end);
405 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
406 avi_read_nikon(s, list_end);
409 case MKTAG('I', 'D', 'I', 'T'): {
410 unsigned char date[64] = {0};
412 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
414 avi_metadata_creation_time(&s->metadata, date);
417 case MKTAG('d', 'm', 'l', 'h'):
419 avio_skip(pb, size + (size & 1));
421 case MKTAG('a', 'm', 'v', 'h'):
423 case MKTAG('a', 'v', 'i', 'h'):
425 /* using frame_period is bad idea */
426 frame_period = avio_rl32(pb);
427 avio_rl32(pb); /* max. bytes per second */
429 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
431 avio_skip(pb, 2 * 4);
434 avih_width=avio_rl32(pb);
435 avih_height=avio_rl32(pb);
437 avio_skip(pb, size - 10 * 4);
439 case MKTAG('s', 't', 'r', 'h'):
442 tag1 = avio_rl32(pb);
443 handler = avio_rl32(pb); /* codec tag */
445 if(tag1 == MKTAG('p', 'a', 'd', 's')){
446 avio_skip(pb, size - 8);
450 st = av_new_stream(s, stream_index);
454 ast = av_mallocz(sizeof(AVIStream));
460 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
462 print_tag("strh", tag1, -1);
464 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
468 * After some consideration -- I don't think we
469 * have to support anything but DV in type1 AVIs.
471 if (s->nb_streams != 1)
474 if (handler != MKTAG('d', 'v', 's', 'd') &&
475 handler != MKTAG('d', 'v', 'h', 'd') &&
476 handler != MKTAG('d', 'v', 's', 'l'))
479 ast = s->streams[0]->priv_data;
480 av_freep(&s->streams[0]->codec->extradata);
481 av_freep(&s->streams[0]->codec);
482 av_freep(&s->streams[0]);
484 if (CONFIG_DV_DEMUXER) {
485 avi->dv_demux = dv_init_demux(s);
489 s->streams[0]->priv_data = ast;
490 avio_skip(pb, 3 * 4);
491 ast->scale = avio_rl32(pb);
492 ast->rate = avio_rl32(pb);
493 avio_skip(pb, 4); /* start time */
495 dv_dur = avio_rl32(pb);
496 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
497 dv_dur *= AV_TIME_BASE;
498 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
501 * else, leave duration alone; timing estimation in utils.c
502 * will make a guess based on bitrate.
505 stream_index = s->nb_streams - 1;
506 avio_skip(pb, size - 9*4);
510 assert(stream_index < s->nb_streams);
511 st->codec->stream_codec_tag= handler;
513 avio_rl32(pb); /* flags */
514 avio_rl16(pb); /* priority */
515 avio_rl16(pb); /* language */
516 avio_rl32(pb); /* initial frame */
517 ast->scale = avio_rl32(pb);
518 ast->rate = avio_rl32(pb);
519 if(!(ast->scale && ast->rate)){
520 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);
523 ast->scale = frame_period;
529 av_set_pts_info(st, 64, ast->scale, ast->rate);
531 ast->cum_len=avio_rl32(pb); /* start */
532 st->nb_frames = avio_rl32(pb);
535 avio_rl32(pb); /* buffer size */
536 avio_rl32(pb); /* quality */
537 ast->sample_size = avio_rl32(pb); /* sample ssize */
538 ast->cum_len *= FFMAX(1, ast->sample_size);
539 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
542 case MKTAG('v', 'i', 'd', 's'):
543 codec_type = AVMEDIA_TYPE_VIDEO;
545 ast->sample_size = 0;
547 case MKTAG('a', 'u', 'd', 's'):
548 codec_type = AVMEDIA_TYPE_AUDIO;
550 case MKTAG('t', 'x', 't', 's'):
551 codec_type = AVMEDIA_TYPE_SUBTITLE;
553 case MKTAG('d', 'a', 't', 's'):
554 codec_type = AVMEDIA_TYPE_DATA;
557 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
559 if(ast->sample_size == 0)
560 st->duration = st->nb_frames;
561 ast->frame_offset= ast->cum_len;
562 avio_skip(pb, size - 12 * 4);
564 case MKTAG('s', 't', 'r', 'f'):
566 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
569 uint64_t cur_pos = avio_tell(pb);
570 if (cur_pos < list_end)
571 size = FFMIN(size, list_end - cur_pos);
572 st = s->streams[stream_index];
574 case AVMEDIA_TYPE_VIDEO:
576 st->codec->width=avih_width;
577 st->codec->height=avih_height;
578 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
579 st->codec->codec_id = CODEC_ID_AMV;
583 tag1 = ff_get_bmp_header(pb, st);
585 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
586 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
587 st->codec->codec_tag = tag1;
588 st->codec->codec_id = CODEC_ID_XSUB;
592 if(size > 10*4 && size<(1<<30)){
593 st->codec->extradata_size= size - 10*4;
594 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
595 if (!st->codec->extradata) {
596 st->codec->extradata_size= 0;
597 return AVERROR(ENOMEM);
599 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
602 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
605 /* Extract palette from extradata if bpp <= 8. */
606 /* This code assumes that extradata contains only palette. */
607 /* This is true for all paletted codecs implemented in FFmpeg. */
608 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
609 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
610 const uint8_t *pal_src;
612 pal_size = FFMIN(pal_size, st->codec->extradata_size);
613 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
615 for (i = 0; i < pal_size/4; i++)
616 ast->pal[i] = AV_RL32(pal_src+4*i);
618 memcpy(ast->pal, pal_src, pal_size);
623 print_tag("video", tag1, 0);
625 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
626 st->codec->codec_tag = tag1;
627 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
628 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
629 // Support "Resolution 1:1" for Avid AVI Codec
630 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
631 st->codec->extradata_size >= 31 &&
632 !memcmp(&st->codec->extradata[28], "1:1", 3))
633 st->codec->codec_id = CODEC_ID_RAWVIDEO;
635 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
636 st->codec->extradata_size+= 9;
637 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
638 if(st->codec->extradata)
639 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
641 st->codec->height= FFABS(st->codec->height);
643 // avio_skip(pb, size - 5 * 4);
645 case AVMEDIA_TYPE_AUDIO:
646 ret = ff_get_wav_header(pb, st->codec, size);
649 ast->dshow_block_align= st->codec->block_align;
650 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
651 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
652 ast->sample_size= st->codec->block_align;
654 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
656 /* Force parsing as several audio frames can be in
657 * one packet and timestamps refer to packet start. */
658 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
659 /* ADTS header is in extradata, AAC without header must be
660 * stored as exact frames. Parser not needed and it will
662 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
663 st->need_parsing = AVSTREAM_PARSE_NONE;
664 /* AVI files with Xan DPCM audio (wrongly) declare PCM
665 * audio in the header but have Axan as stream_code_tag. */
666 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
667 st->codec->codec_id = CODEC_ID_XAN_DPCM;
668 st->codec->codec_tag = 0;
670 if (amv_file_format){
671 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
672 ast->dshow_block_align = 0;
675 case AVMEDIA_TYPE_SUBTITLE:
676 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
677 st->request_probe= 1;
680 st->codec->codec_type = AVMEDIA_TYPE_DATA;
681 st->codec->codec_id= CODEC_ID_NONE;
682 st->codec->codec_tag= 0;
688 case MKTAG('i', 'n', 'd', 'x'):
690 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml){
691 read_braindead_odml_indx(s, 0);
693 avio_seek(pb, i+size, SEEK_SET);
695 case MKTAG('v', 'p', 'r', 'p'):
696 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
697 AVRational active, active_aspect;
699 st = s->streams[stream_index];
706 active_aspect.den= avio_rl16(pb);
707 active_aspect.num= avio_rl16(pb);
708 active.num = avio_rl32(pb);
709 active.den = avio_rl32(pb);
710 avio_rl32(pb); //nbFieldsPerFrame
712 if(active_aspect.num && active_aspect.den && active.num && active.den){
713 st->sample_aspect_ratio= av_div_q(active_aspect, active);
714 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
720 case MKTAG('s', 't', 'r', 'n'):
722 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
727 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
728 "I will ignore it and try to continue anyway.\n");
729 avi->movi_list = avio_tell(pb) - 4;
730 avi->movi_end = avio_size(pb);
740 /* check stream number */
741 if (stream_index != s->nb_streams - 1) {
746 if(!avi->index_loaded && pb->seekable)
748 avi->index_loaded = 1;
749 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
750 for(i=0; i<s->nb_streams; i++){
751 AVStream *st = s->streams[i];
752 if(st->nb_index_entries)
755 // DV-in-AVI cannot be non-interleaved, if set this must be
758 avi->non_interleaved=0;
759 if(i==s->nb_streams && avi->non_interleaved) {
760 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
761 avi->non_interleaved=0;
764 if(avi->non_interleaved) {
765 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
769 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
774 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
775 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
777 int score = AVPROBE_SCORE_MAX / 2, ret;
778 AVIStream *ast = st->priv_data;
779 AVInputFormat *sub_demuxer;
780 AVRational time_base;
781 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
783 0, NULL, NULL, NULL, NULL);
785 unsigned int desc_len = avio_rl32(pb);
787 if (desc_len > pb->buf_end - pb->buf_ptr)
790 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
791 avio_skip(pb, desc_len - ret);
793 av_dict_set(&st->metadata, "title", desc, 0);
795 avio_rl16(pb); /* flags? */
796 avio_rl32(pb); /* data size */
798 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
799 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
802 if (!(ast->sub_ctx = avformat_alloc_context()))
805 ast->sub_ctx->pb = pb;
806 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
807 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
808 *st->codec = *ast->sub_ctx->streams[0]->codec;
809 ast->sub_ctx->streams[0]->codec->extradata = NULL;
810 time_base = ast->sub_ctx->streams[0]->time_base;
811 av_set_pts_info(st, 64, time_base.num, time_base.den);
813 ast->sub_buffer = pkt->data;
814 memset(pkt, 0, sizeof(*pkt));
822 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
825 AVIStream *ast, *next_ast = next_st->priv_data;
826 int64_t ts, next_ts, ts_min = INT64_MAX;
827 AVStream *st, *sub_st = NULL;
830 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
833 for (i=0; i<s->nb_streams; i++) {
836 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
837 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
838 if (ts <= next_ts && ts < ts_min) {
846 ast = sub_st->priv_data;
848 pkt->stream_index = sub_st->index;
849 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
850 ast->sub_pkt.data = NULL;
855 static int get_stream_idx(int *d){
856 if( d[0] >= '0' && d[0] <= '9'
857 && d[1] >= '0' && d[1] <= '9'){
858 return (d[0] - '0') * 10 + (d[1] - '0');
860 return 100; //invalid stream ID
864 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
866 AVIContext *avi = s->priv_data;
867 AVIOContext *pb = s->pb;
873 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
874 int size = dv_get_packet(avi->dv_demux, pkt);
879 if(avi->non_interleaved){
880 int best_stream_index = 0;
881 AVStream *best_st= NULL;
883 int64_t best_ts= INT64_MAX;
886 for(i=0; i<s->nb_streams; i++){
887 AVStream *st = s->streams[i];
888 AVIStream *ast = st->priv_data;
889 int64_t ts= ast->frame_offset;
892 if(!st->nb_index_entries)
895 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
896 if(!ast->remaining && ts > last_ts)
899 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
901 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
905 best_stream_index= i;
911 best_ast = best_st->priv_data;
912 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
913 if(best_ast->remaining)
914 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
916 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
918 best_ast->frame_offset= best_st->index_entries[i].timestamp;
921 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
923 int64_t pos= best_st->index_entries[i].pos;
924 pos += best_ast->packet_size - best_ast->remaining;
925 avio_seek(s->pb, pos + 8, SEEK_SET);
926 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
928 assert(best_ast->remaining <= best_ast->packet_size);
930 avi->stream_index= best_stream_index;
931 if(!best_ast->remaining)
932 best_ast->packet_size=
933 best_ast->remaining= best_st->index_entries[i].size;
938 if(avi->stream_index >= 0){
939 AVStream *st= s->streams[ avi->stream_index ];
940 AVIStream *ast= st->priv_data;
943 if(get_subtitle_pkt(s, st, pkt))
946 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
948 else if(ast->sample_size < 32)
949 // arbitrary multiplier to avoid tiny packets for raw PCM data
950 size= 1024*ast->sample_size;
952 size= ast->sample_size;
954 if(size > ast->remaining)
955 size= ast->remaining;
956 avi->last_pkt_pos= avio_tell(pb);
957 err= av_get_packet(pb, pkt, size);
961 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
963 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
965 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
967 memcpy(pal, ast->pal, AVPALETTE_SIZE);
972 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
973 dstr = pkt->destruct;
974 size = dv_produce_packet(avi->dv_demux, pkt,
975 pkt->data, pkt->size, pkt->pos);
976 pkt->destruct = dstr;
977 pkt->flags |= AV_PKT_FLAG_KEY;
980 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
981 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
983 avi->stream_index = -1;
987 /* XXX: How to handle B-frames in AVI? */
988 pkt->dts = ast->frame_offset;
989 // pkt->dts += ast->start;
991 pkt->dts /= ast->sample_size;
992 //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);
993 pkt->stream_index = avi->stream_index;
995 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
998 assert(st->index_entries);
1000 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1001 e= &st->index_entries[index];
1003 if(index >= 0 && e->timestamp == ast->frame_offset){
1004 if (index == st->nb_index_entries-1){
1008 for(i=0; i<FFMIN(size,256); i++){
1009 if(st->codec->codec_id == CODEC_ID_MPEG4){
1011 key= !(pkt->data[i]&0xC0);
1016 state= (state<<8) + pkt->data[i];
1019 e->flags &= ~AVINDEX_KEYFRAME;
1021 if (e->flags & AVINDEX_KEYFRAME)
1022 pkt->flags |= AV_PKT_FLAG_KEY;
1025 pkt->flags |= AV_PKT_FLAG_KEY;
1027 ast->frame_offset += get_duration(ast, pkt->size);
1029 ast->remaining -= size;
1030 if(!ast->remaining){
1031 avi->stream_index= -1;
1032 ast->packet_size= 0;
1035 if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
1036 av_free_packet(pkt);
1044 memset(d, -1, sizeof(int)*8);
1045 for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
1052 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1054 n= get_stream_idx(d+2);
1055 //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);
1056 if(i + (uint64_t)size > avi->fsize || d[0]<0)
1060 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1062 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1063 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1064 avio_skip(pb, size);
1065 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1070 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1075 n= get_stream_idx(d);
1077 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1080 //detect ##ix chunk and skip
1081 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1082 avio_skip(pb, size);
1087 if(n < s->nb_streams){
1091 ast = st->priv_data;
1093 if(s->nb_streams>=2){
1094 AVStream *st1 = s->streams[1];
1095 AVIStream *ast1= st1->priv_data;
1096 //workaround for broken small-file-bug402.avi
1097 if( d[2] == 'w' && d[3] == 'b'
1099 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1100 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1101 && ast->prefix == 'd'*256+'c'
1102 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1107 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1112 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1113 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1114 || st->discard >= AVDISCARD_ALL){
1115 ast->frame_offset += get_duration(ast, size);
1116 avio_skip(pb, size);
1120 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1121 int k = avio_r8(pb);
1122 int last = (k + avio_r8(pb) - 1) & 0xFF;
1124 avio_rl16(pb); //flags
1126 for (; k <= last; k++)
1127 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1130 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1131 d[2]*256+d[3] == ast->prefix /*||
1132 (d[2] == 'd' && d[3] == 'c') ||
1133 (d[2] == 'w' && d[3] == 'b')*/) {
1135 //av_log(s, AV_LOG_DEBUG, "OK\n");
1136 if(d[2]*256+d[3] == ast->prefix)
1137 ast->prefix_count++;
1139 ast->prefix= d[2]*256+d[3];
1140 ast->prefix_count= 0;
1143 avi->stream_index= n;
1144 ast->packet_size= size + 8;
1145 ast->remaining= size;
1147 if(size || !ast->sample_size){
1148 uint64_t pos= avio_tell(pb) - 8;
1149 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1150 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1161 /* XXX: We make the implicit supposition that the positions are sorted
1163 static int avi_read_idx1(AVFormatContext *s, int size)
1165 AVIContext *avi = s->priv_data;
1166 AVIOContext *pb = s->pb;
1167 int nb_index_entries, i;
1170 unsigned int index, tag, flags, pos, len;
1171 unsigned last_pos= -1;
1173 nb_index_entries = size / 16;
1174 if (nb_index_entries <= 0)
1177 /* Read the entries and sort them in each stream component. */
1178 for(i = 0; i < nb_index_entries; i++) {
1179 tag = avio_rl32(pb);
1180 flags = avio_rl32(pb);
1181 pos = avio_rl32(pb);
1182 len = avio_rl32(pb);
1183 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1184 i, tag, flags, pos, len);
1185 if(i==0 && pos > avi->movi_list)
1186 avi->movi_list= 0; //FIXME better check
1187 pos += avi->movi_list;
1189 index = ((tag & 0xff) - '0') * 10;
1190 index += ((tag >> 8) & 0xff) - '0';
1191 if (index >= s->nb_streams)
1193 st = s->streams[index];
1194 ast = st->priv_data;
1196 #if defined(DEBUG_SEEK)
1197 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1203 avi->non_interleaved= 1;
1204 else if(len || !ast->sample_size)
1205 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1206 ast->cum_len += get_duration(ast, len);
1212 static int guess_ni_flag(AVFormatContext *s){
1214 int64_t last_start=0;
1215 int64_t first_end= INT64_MAX;
1216 int64_t oldpos= avio_tell(s->pb);
1218 for(i=0; i<s->nb_streams; i++){
1219 AVStream *st = s->streams[i];
1220 int n= st->nb_index_entries;
1227 int64_t pos= st->index_entries[0].pos;
1228 avio_seek(s->pb, pos + 4, SEEK_SET);
1229 size= avio_rl32(s->pb);
1230 if(pos + size > st->index_entries[1].pos)
1231 last_start= INT64_MAX;
1234 if(st->index_entries[0].pos > last_start)
1235 last_start= st->index_entries[0].pos;
1236 if(st->index_entries[n-1].pos < first_end)
1237 first_end= st->index_entries[n-1].pos;
1239 avio_seek(s->pb, oldpos, SEEK_SET);
1240 return last_start > first_end;
1243 static int avi_load_index(AVFormatContext *s)
1245 AVIContext *avi = s->priv_data;
1246 AVIOContext *pb = s->pb;
1248 int64_t pos= avio_tell(pb);
1251 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1252 goto the_end; // maybe truncated file
1253 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1257 tag = avio_rl32(pb);
1258 size = avio_rl32(pb);
1259 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1266 case MKTAG('i', 'd', 'x', '1'):
1267 if (avi_read_idx1(s, size) < 0)
1275 if (avio_skip(pb, size) < 0)
1276 goto the_end; // something is wrong here
1281 avio_seek(pb, pos, SEEK_SET);
1285 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1287 AVIStream *ast2 = st2->priv_data;
1288 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1289 av_free_packet(&ast2->sub_pkt);
1290 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1291 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1292 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1295 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1297 AVIContext *avi = s->priv_data;
1300 int64_t pos, pos_min;
1303 if (!avi->index_loaded) {
1304 /* we only load the index on demand */
1306 avi->index_loaded = 1;
1308 assert(stream_index>= 0);
1310 st = s->streams[stream_index];
1312 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1316 /* find the position */
1317 pos = st->index_entries[index].pos;
1318 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1320 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1322 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1323 /* One and only one real stream for DV in AVI, and it has video */
1324 /* offsets. Calling with other stream indexes should have failed */
1325 /* the av_index_search_timestamp call above. */
1326 assert(stream_index == 0);
1328 /* Feed the DV video stream version of the timestamp to the */
1329 /* DV demux so it can synthesize correct timestamps. */
1330 dv_offset_reset(avi->dv_demux, timestamp);
1332 avio_seek(s->pb, pos, SEEK_SET);
1333 avi->stream_index= -1;
1338 for(i = 0; i < s->nb_streams; i++) {
1339 AVStream *st2 = s->streams[i];
1340 AVIStream *ast2 = st2->priv_data;
1345 if (ast2->sub_ctx) {
1346 seek_subtitle(st, st2, timestamp);
1350 if (st2->nb_index_entries <= 0)
1353 // assert(st2->codec->block_align);
1354 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1355 index = av_index_search_timestamp(
1357 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1358 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1361 ast2->seek_pos= st2->index_entries[index].pos;
1362 pos_min= FFMIN(pos_min,ast2->seek_pos);
1364 for(i = 0; i < s->nb_streams; i++) {
1365 AVStream *st2 = s->streams[i];
1366 AVIStream *ast2 = st2->priv_data;
1368 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1371 index = av_index_search_timestamp(
1373 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1374 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1377 while(index>0 && st2->index_entries[index-1].pos >= pos_min)
1379 ast2->frame_offset = st2->index_entries[index].timestamp;
1383 avio_seek(s->pb, pos_min, SEEK_SET);
1384 avi->stream_index= -1;
1388 static int avi_read_close(AVFormatContext *s)
1391 AVIContext *avi = s->priv_data;
1393 for(i=0;i<s->nb_streams;i++) {
1394 AVStream *st = s->streams[i];
1395 AVIStream *ast = st->priv_data;
1398 av_freep(&ast->sub_ctx->pb);
1399 av_close_input_file(ast->sub_ctx);
1401 av_free(ast->sub_buffer);
1402 av_free_packet(&ast->sub_pkt);
1406 av_free(avi->dv_demux);
1411 static int avi_probe(AVProbeData *p)
1415 /* check file header */
1416 for(i=0; avi_headers[i][0]; i++)
1417 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1418 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1419 return AVPROBE_SCORE_MAX;
1424 AVInputFormat ff_avi_demuxer = {
1426 NULL_IF_CONFIG_SMALL("AVI format"),
1433 .priv_class = &demuxer_class,