3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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/dict.h"
26 #include "libavutil/avstring.h"
36 typedef struct AVIStream {
37 int64_t frame_offset; /* current frame (video) or byte (audio) counter
38 (used to compute the pts) */
44 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
46 int64_t cum_len; /* temporary storage (used during seek) */
48 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
52 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
54 AVFormatContext *sub_ctx;
69 DVDemuxContext* dv_demux;
71 #define MAX_ODML_DEPTH 1000
74 static const char avi_headers[][8] = {
75 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
76 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
77 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
78 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
79 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
83 static const AVMetadataConv avi_metadata_conv[] = {
88 static int avi_load_index(AVFormatContext *s);
89 static int guess_ni_flag(AVFormatContext *s);
91 #define print_tag(str, tag, size) \
92 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
99 static inline int get_duration(AVIStream *ast, int len){
100 if(ast->sample_size){
102 }else if (ast->dshow_block_align){
103 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
108 static int get_riff(AVFormatContext *s, AVIOContext *pb)
110 AVIContext *avi = s->priv_data;
114 /* check RIFF header */
115 avio_read(pb, header, 4);
116 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
117 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
118 avio_read(pb, header+4, 4);
120 for(i=0; avi_headers[i][0]; i++)
121 if(!memcmp(header, avi_headers[i], 8))
123 if(!avi_headers[i][0])
126 if(header[7] == 0x19)
127 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
132 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
133 AVIContext *avi = s->priv_data;
134 AVIOContext *pb = s->pb;
135 int longs_pre_entry= avio_rl16(pb);
136 int index_sub_type = avio_r8(pb);
137 int index_type = avio_r8(pb);
138 int entries_in_use = avio_rl32(pb);
139 int chunk_id = avio_rl32(pb);
140 int64_t base = avio_rl64(pb);
141 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
145 int64_t last_pos= -1;
146 int64_t filesize= avio_size(s->pb);
148 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
149 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
151 if(stream_id >= s->nb_streams || stream_id < 0)
153 st= s->streams[stream_id];
161 if(index_type && longs_pre_entry != 2)
166 if(filesize > 0 && base >= filesize){
167 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
168 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
174 for(i=0; i<entries_in_use; i++){
176 int64_t pos= avio_rl32(pb) + base - 8;
177 int len = avio_rl32(pb);
181 av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len);
186 if(last_pos == pos || pos == base - 8)
187 avi->non_interleaved= 1;
188 if(last_pos != pos && (len || !ast->sample_size))
189 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
191 ast->cum_len += get_duration(ast, len);
196 offset = avio_rl64(pb);
197 avio_rl32(pb); /* size */
198 duration = avio_rl32(pb);
205 if(avi->odml_depth > MAX_ODML_DEPTH){
206 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
210 avio_seek(pb, offset+8, SEEK_SET);
212 read_braindead_odml_indx(s, frame_num);
214 frame_num += duration;
216 avio_seek(pb, pos, SEEK_SET);
223 static void clean_index(AVFormatContext *s){
227 for(i=0; i<s->nb_streams; i++){
228 AVStream *st = s->streams[i];
229 AVIStream *ast = st->priv_data;
230 int n= st->nb_index_entries;
231 int max= ast->sample_size;
232 int64_t pos, size, ts;
234 if(n != 1 || ast->sample_size==0)
237 while(max < 1024) max+=max;
239 pos= st->index_entries[0].pos;
240 size= st->index_entries[0].size;
241 ts= st->index_entries[0].timestamp;
243 for(j=0; j<size; j+=max){
244 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
249 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
251 AVIOContext *pb = s->pb;
252 char key[5] = {0}, *value;
256 if (size == UINT_MAX)
258 value = av_malloc(size+1);
261 avio_read(pb, value, size);
266 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
267 AV_DICT_DONT_STRDUP_VAL);
270 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
271 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
273 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
275 char month[4], time[9], buffer[64];
277 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
278 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
279 month, &day, time, &year) == 4) {
281 if (!av_strcasecmp(month, months[i])) {
282 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
283 year, i+1, day, time);
284 av_dict_set(metadata, "creation_time", buffer, 0);
286 } else if (date[4] == '/' && date[7] == '/') {
287 date[4] = date[7] = '-';
288 av_dict_set(metadata, "creation_time", date, 0);
292 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
294 while (avio_tell(s->pb) < end) {
295 uint32_t tag = avio_rl32(s->pb);
296 uint32_t size = avio_rl32(s->pb);
298 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
299 uint64_t tag_end = avio_tell(s->pb) + size;
300 while (avio_tell(s->pb) < tag_end) {
301 uint16_t tag = avio_rl16(s->pb);
302 uint16_t size = avio_rl16(s->pb);
303 const char *name = NULL;
304 char buffer[64] = {0};
305 size -= avio_read(s->pb, buffer,
306 FFMIN(size, sizeof(buffer)-1));
308 case 0x03: name = "maker"; break;
309 case 0x04: name = "model"; break;
310 case 0x13: name = "creation_time";
311 if (buffer[4] == ':' && buffer[7] == ':')
312 buffer[4] = buffer[7] = '-';
316 av_dict_set(&s->metadata, name, buffer, 0);
317 avio_skip(s->pb, size);
322 avio_skip(s->pb, size);
328 static int avi_read_header(AVFormatContext *s)
330 AVIContext *avi = s->priv_data;
331 AVIOContext *pb = s->pb;
332 unsigned int tag, tag1, handler;
333 int codec_type, stream_index, frame_period;
337 AVIStream *ast = NULL;
338 int avih_width=0, avih_height=0;
339 int amv_file_format=0;
340 uint64_t list_end = 0;
343 avi->stream_index= -1;
345 if (get_riff(s, pb) < 0)
348 avi->fsize = avio_size(pb);
350 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
360 size = avio_rl32(pb);
362 print_tag("tag", tag, size);
365 case MKTAG('L', 'I', 'S', 'T'):
366 list_end = avio_tell(pb) + size;
367 /* Ignored, except at start of video packets. */
368 tag1 = avio_rl32(pb);
370 print_tag("list", tag1, 0);
372 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
373 avi->movi_list = avio_tell(pb) - 4;
374 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
375 else avi->movi_end = avio_size(pb);
376 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
379 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
380 ff_read_riff_info(s, size - 4);
381 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
382 avi_read_nikon(s, list_end);
385 case MKTAG('I', 'D', 'I', 'T'): {
386 unsigned char date[64] = {0};
388 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
390 avi_metadata_creation_time(&s->metadata, date);
393 case MKTAG('d', 'm', 'l', 'h'):
395 avio_skip(pb, size + (size & 1));
397 case MKTAG('a', 'm', 'v', 'h'):
399 case MKTAG('a', 'v', 'i', 'h'):
401 /* using frame_period is bad idea */
402 frame_period = avio_rl32(pb);
405 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
407 avio_skip(pb, 2 * 4);
410 avih_width=avio_rl32(pb);
411 avih_height=avio_rl32(pb);
413 avio_skip(pb, size - 10 * 4);
415 case MKTAG('s', 't', 'r', 'h'):
418 tag1 = avio_rl32(pb);
419 handler = avio_rl32(pb); /* codec tag */
421 if(tag1 == MKTAG('p', 'a', 'd', 's')){
422 avio_skip(pb, size - 8);
426 st = avformat_new_stream(s, NULL);
430 st->id = stream_index;
431 ast = av_mallocz(sizeof(AVIStream));
437 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
439 print_tag("strh", tag1, -1);
441 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
445 * After some consideration -- I don't think we
446 * have to support anything but DV in type1 AVIs.
448 if (s->nb_streams != 1)
451 if (handler != MKTAG('d', 'v', 's', 'd') &&
452 handler != MKTAG('d', 'v', 'h', 'd') &&
453 handler != MKTAG('d', 'v', 's', 'l'))
456 ast = s->streams[0]->priv_data;
457 av_freep(&s->streams[0]->codec->extradata);
458 av_freep(&s->streams[0]->codec);
459 av_freep(&s->streams[0]);
461 if (CONFIG_DV_DEMUXER) {
462 avi->dv_demux = avpriv_dv_init_demux(s);
466 s->streams[0]->priv_data = ast;
467 avio_skip(pb, 3 * 4);
468 ast->scale = avio_rl32(pb);
469 ast->rate = avio_rl32(pb);
470 avio_skip(pb, 4); /* start time */
472 dv_dur = avio_rl32(pb);
473 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
474 dv_dur *= AV_TIME_BASE;
475 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
478 * else, leave duration alone; timing estimation in utils.c
479 * will make a guess based on bitrate.
482 stream_index = s->nb_streams - 1;
483 avio_skip(pb, size - 9*4);
487 assert(stream_index < s->nb_streams);
488 st->codec->stream_codec_tag= handler;
490 avio_rl32(pb); /* flags */
491 avio_rl16(pb); /* priority */
492 avio_rl16(pb); /* language */
493 avio_rl32(pb); /* initial frame */
494 ast->scale = avio_rl32(pb);
495 ast->rate = avio_rl32(pb);
496 if(!(ast->scale && ast->rate)){
497 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);
500 ast->scale = frame_period;
506 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
508 ast->cum_len=avio_rl32(pb); /* start */
509 st->nb_frames = avio_rl32(pb);
512 avio_rl32(pb); /* buffer size */
513 avio_rl32(pb); /* quality */
514 ast->sample_size = avio_rl32(pb); /* sample ssize */
515 ast->cum_len *= FFMAX(1, ast->sample_size);
516 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
519 case MKTAG('v', 'i', 'd', 's'):
520 codec_type = AVMEDIA_TYPE_VIDEO;
522 ast->sample_size = 0;
524 case MKTAG('a', 'u', 'd', 's'):
525 codec_type = AVMEDIA_TYPE_AUDIO;
527 case MKTAG('t', 'x', 't', 's'):
528 codec_type = AVMEDIA_TYPE_SUBTITLE;
530 case MKTAG('d', 'a', 't', 's'):
531 codec_type = AVMEDIA_TYPE_DATA;
534 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
537 if(ast->sample_size == 0)
538 st->duration = st->nb_frames;
539 ast->frame_offset= ast->cum_len;
540 avio_skip(pb, size - 12 * 4);
542 case MKTAG('s', 't', 'r', 'f'):
544 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
547 uint64_t cur_pos = avio_tell(pb);
548 if (cur_pos < list_end)
549 size = FFMIN(size, list_end - cur_pos);
550 st = s->streams[stream_index];
552 case AVMEDIA_TYPE_VIDEO:
554 st->codec->width=avih_width;
555 st->codec->height=avih_height;
556 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
557 st->codec->codec_id = CODEC_ID_AMV;
561 tag1 = ff_get_bmp_header(pb, st);
563 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
564 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
565 st->codec->codec_tag = tag1;
566 st->codec->codec_id = CODEC_ID_XSUB;
570 if(size > 10*4 && size<(1<<30)){
571 st->codec->extradata_size= size - 10*4;
572 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
573 if (!st->codec->extradata) {
574 st->codec->extradata_size= 0;
575 return AVERROR(ENOMEM);
577 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
580 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
583 /* Extract palette from extradata if bpp <= 8. */
584 /* This code assumes that extradata contains only palette. */
585 /* This is true for all paletted codecs implemented in Libav. */
586 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
587 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
588 const uint8_t *pal_src;
590 pal_size = FFMIN(pal_size, st->codec->extradata_size);
591 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
593 for (i = 0; i < pal_size/4; i++)
594 ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]);
596 memcpy(ast->pal, pal_src, pal_size);
601 print_tag("video", tag1, 0);
603 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
604 st->codec->codec_tag = tag1;
605 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
606 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
607 // Support "Resolution 1:1" for Avid AVI Codec
608 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
609 st->codec->extradata_size >= 31 &&
610 !memcmp(&st->codec->extradata[28], "1:1", 3))
611 st->codec->codec_id = CODEC_ID_RAWVIDEO;
613 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
614 st->codec->extradata_size+= 9;
615 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
616 if(st->codec->extradata)
617 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
619 st->codec->height= FFABS(st->codec->height);
621 // avio_skip(pb, size - 5 * 4);
623 case AVMEDIA_TYPE_AUDIO:
624 ret = ff_get_wav_header(pb, st->codec, size);
627 ast->dshow_block_align= st->codec->block_align;
628 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
629 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
630 ast->sample_size= st->codec->block_align;
632 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
634 /* Force parsing as several audio frames can be in
635 * one packet and timestamps refer to packet start. */
636 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
637 /* ADTS header is in extradata, AAC without header must be
638 * stored as exact frames. Parser not needed and it will
640 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
641 st->need_parsing = AVSTREAM_PARSE_NONE;
642 /* AVI files with Xan DPCM audio (wrongly) declare PCM
643 * audio in the header but have Axan as stream_code_tag. */
644 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
645 st->codec->codec_id = CODEC_ID_XAN_DPCM;
646 st->codec->codec_tag = 0;
648 if (amv_file_format){
649 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
650 ast->dshow_block_align = 0;
653 case AVMEDIA_TYPE_SUBTITLE:
654 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
655 st->codec->codec_id = CODEC_ID_PROBE;
658 st->codec->codec_type = AVMEDIA_TYPE_DATA;
659 st->codec->codec_id= CODEC_ID_NONE;
660 st->codec->codec_tag= 0;
666 case MKTAG('i', 'n', 'd', 'x'):
668 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
669 read_braindead_odml_indx(s, 0) < 0 &&
670 (s->error_recognition & AV_EF_EXPLODE))
672 avio_seek(pb, i+size, SEEK_SET);
674 case MKTAG('v', 'p', 'r', 'p'):
675 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
676 AVRational active, active_aspect;
678 st = s->streams[stream_index];
685 active_aspect.den= avio_rl16(pb);
686 active_aspect.num= avio_rl16(pb);
687 active.num = avio_rl32(pb);
688 active.den = avio_rl32(pb);
689 avio_rl32(pb); //nbFieldsPerFrame
691 if(active_aspect.num && active_aspect.den && active.num && active.den){
692 st->sample_aspect_ratio= av_div_q(active_aspect, active);
693 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
699 case MKTAG('s', 't', 'r', 'n'):
701 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
706 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
707 "I will ignore it and try to continue anyway.\n");
708 if (s->error_recognition & AV_EF_EXPLODE)
710 avi->movi_list = avio_tell(pb) - 4;
711 avi->movi_end = avio_size(pb);
721 /* check stream number */
722 if (stream_index != s->nb_streams - 1) {
727 if(!avi->index_loaded && pb->seekable)
729 avi->index_loaded = 1;
730 avi->non_interleaved |= guess_ni_flag(s);
731 for(i=0; i<s->nb_streams; i++){
732 AVStream *st = s->streams[i];
733 if(st->nb_index_entries)
736 if(i==s->nb_streams && avi->non_interleaved) {
737 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
738 avi->non_interleaved=0;
741 if(avi->non_interleaved) {
742 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
746 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
747 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
752 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
753 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
755 int score = AVPROBE_SCORE_MAX / 2, ret;
756 AVIStream *ast = st->priv_data;
757 AVInputFormat *sub_demuxer;
758 AVRational time_base;
759 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
761 0, NULL, NULL, NULL, NULL);
763 unsigned int desc_len = avio_rl32(pb);
765 if (desc_len > pb->buf_end - pb->buf_ptr)
768 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
769 avio_skip(pb, desc_len - ret);
771 av_dict_set(&st->metadata, "title", desc, 0);
773 avio_rl16(pb); /* flags? */
774 avio_rl32(pb); /* data size */
776 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
777 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
780 if (!(ast->sub_ctx = avformat_alloc_context()))
783 ast->sub_ctx->pb = pb;
784 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
785 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
786 *st->codec = *ast->sub_ctx->streams[0]->codec;
787 ast->sub_ctx->streams[0]->codec->extradata = NULL;
788 time_base = ast->sub_ctx->streams[0]->time_base;
789 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
791 ast->sub_buffer = pkt->data;
792 memset(pkt, 0, sizeof(*pkt));
800 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
803 AVIStream *ast, *next_ast = next_st->priv_data;
804 int64_t ts, next_ts, ts_min = INT64_MAX;
805 AVStream *st, *sub_st = NULL;
808 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
811 for (i=0; i<s->nb_streams; i++) {
814 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
815 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
816 if (ts <= next_ts && ts < ts_min) {
824 ast = sub_st->priv_data;
826 pkt->stream_index = sub_st->index;
827 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
828 ast->sub_pkt.data = NULL;
833 static int get_stream_idx(int *d){
834 if( d[0] >= '0' && d[0] <= '9'
835 && d[1] >= '0' && d[1] <= '9'){
836 return (d[0] - '0') * 10 + (d[1] - '0');
838 return 100; //invalid stream ID
842 static int avi_sync(AVFormatContext *s, int exit_early)
844 AVIContext *avi = s->priv_data;
845 AVIOContext *pb = s->pb;
852 memset(d, -1, sizeof(d));
853 for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
860 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
862 n= get_stream_idx(d+2);
863 //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);
864 if(i + (uint64_t)size > avi->fsize || d[0] > 127)
868 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
870 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
871 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
873 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
878 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
883 n= get_stream_idx(d);
885 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
888 //detect ##ix chunk and skip
889 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
895 if(n < s->nb_streams){
901 if(s->nb_streams>=2){
902 AVStream *st1 = s->streams[1];
903 AVIStream *ast1= st1->priv_data;
904 //workaround for broken small-file-bug402.avi
905 if( d[2] == 'w' && d[3] == 'b'
907 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
908 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
909 && ast->prefix == 'd'*256+'c'
910 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
915 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
920 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
921 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
922 || st->discard >= AVDISCARD_ALL){
924 ast->frame_offset += get_duration(ast, size);
930 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
932 int last = (k + avio_r8(pb) - 1) & 0xFF;
934 avio_rl16(pb); //flags
936 for (; k <= last; k++)
937 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
940 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
941 d[2]*256+d[3] == ast->prefix /*||
942 (d[2] == 'd' && d[3] == 'c') ||
943 (d[2] == 'w' && d[3] == 'b')*/) {
947 //av_log(s, AV_LOG_DEBUG, "OK\n");
948 if(d[2]*256+d[3] == ast->prefix)
951 ast->prefix= d[2]*256+d[3];
952 ast->prefix_count= 0;
955 avi->stream_index= n;
956 ast->packet_size= size + 8;
957 ast->remaining= size;
959 if(size || !ast->sample_size){
960 uint64_t pos= avio_tell(pb) - 8;
961 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
962 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
973 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
975 AVIContext *avi = s->priv_data;
976 AVIOContext *pb = s->pb;
980 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
981 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
986 if(avi->non_interleaved){
987 int best_stream_index = 0;
988 AVStream *best_st= NULL;
990 int64_t best_ts= INT64_MAX;
993 for(i=0; i<s->nb_streams; i++){
994 AVStream *st = s->streams[i];
995 AVIStream *ast = st->priv_data;
996 int64_t ts= ast->frame_offset;
999 if(!st->nb_index_entries)
1002 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1003 if(!ast->remaining && ts > last_ts)
1006 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
1008 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
1012 best_stream_index= i;
1018 best_ast = best_st->priv_data;
1019 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
1020 if(best_ast->remaining)
1021 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
1023 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1025 best_ast->frame_offset= best_st->index_entries[i].timestamp;
1028 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
1030 int64_t pos= best_st->index_entries[i].pos;
1031 pos += best_ast->packet_size - best_ast->remaining;
1032 avio_seek(s->pb, pos + 8, SEEK_SET);
1033 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
1035 assert(best_ast->remaining <= best_ast->packet_size);
1037 avi->stream_index= best_stream_index;
1038 if(!best_ast->remaining)
1039 best_ast->packet_size=
1040 best_ast->remaining= best_st->index_entries[i].size;
1045 if(avi->stream_index >= 0){
1046 AVStream *st= s->streams[ avi->stream_index ];
1047 AVIStream *ast= st->priv_data;
1050 if(get_subtitle_pkt(s, st, pkt))
1053 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1055 else if(ast->sample_size < 32)
1056 // arbitrary multiplier to avoid tiny packets for raw PCM data
1057 size= 1024*ast->sample_size;
1059 size= ast->sample_size;
1061 if(size > ast->remaining)
1062 size= ast->remaining;
1063 avi->last_pkt_pos= avio_tell(pb);
1064 err= av_get_packet(pb, pkt, size);
1068 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
1070 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
1072 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
1074 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1079 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1080 dstr = pkt->destruct;
1081 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1082 pkt->data, pkt->size);
1083 pkt->destruct = dstr;
1084 pkt->flags |= AV_PKT_FLAG_KEY;
1086 av_free_packet(pkt);
1087 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
1088 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1089 ast->frame_offset++;
1090 avi->stream_index = -1;
1094 /* XXX: How to handle B-frames in AVI? */
1095 pkt->dts = ast->frame_offset;
1096 // pkt->dts += ast->start;
1097 if(ast->sample_size)
1098 pkt->dts /= ast->sample_size;
1099 //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);
1100 pkt->stream_index = avi->stream_index;
1102 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1105 assert(st->index_entries);
1107 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1108 e= &st->index_entries[index];
1110 if(index >= 0 && e->timestamp == ast->frame_offset){
1111 if (e->flags & AVINDEX_KEYFRAME)
1112 pkt->flags |= AV_PKT_FLAG_KEY;
1115 pkt->flags |= AV_PKT_FLAG_KEY;
1117 ast->frame_offset += get_duration(ast, pkt->size);
1119 ast->remaining -= size;
1120 if(!ast->remaining){
1121 avi->stream_index= -1;
1122 ast->packet_size= 0;
1128 if ((err = avi_sync(s, 0)) < 0)
1133 /* XXX: We make the implicit supposition that the positions are sorted
1135 static int avi_read_idx1(AVFormatContext *s, int size)
1137 AVIContext *avi = s->priv_data;
1138 AVIOContext *pb = s->pb;
1139 int nb_index_entries, i;
1142 unsigned int index, tag, flags, pos, len, first_packet = 1;
1143 unsigned last_pos= -1;
1144 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1146 nb_index_entries = size / 16;
1147 if (nb_index_entries <= 0)
1150 idx1_pos = avio_tell(pb);
1151 avio_seek(pb, avi->movi_list+4, SEEK_SET);
1152 if (avi_sync(s, 1) == 0) {
1153 first_packet_pos = avio_tell(pb) - 8;
1155 avi->stream_index = -1;
1156 avio_seek(pb, idx1_pos, SEEK_SET);
1158 /* Read the entries and sort them in each stream component. */
1159 for(i = 0; i < nb_index_entries; i++) {
1160 tag = avio_rl32(pb);
1161 flags = avio_rl32(pb);
1162 pos = avio_rl32(pb);
1163 len = avio_rl32(pb);
1164 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1165 i, tag, flags, pos, len);
1167 index = ((tag & 0xff) - '0') * 10;
1168 index += ((tag >> 8) & 0xff) - '0';
1169 if (index >= s->nb_streams)
1171 st = s->streams[index];
1172 ast = st->priv_data;
1174 if(first_packet && first_packet_pos && len) {
1175 data_offset = first_packet_pos - pos;
1180 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1186 avi->non_interleaved= 1;
1187 else if(len || !ast->sample_size)
1188 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1189 ast->cum_len += get_duration(ast, len);
1195 static int guess_ni_flag(AVFormatContext *s){
1197 int64_t last_start=0;
1198 int64_t first_end= INT64_MAX;
1199 int64_t oldpos= avio_tell(s->pb);
1201 for(i=0; i<s->nb_streams; i++){
1202 AVStream *st = s->streams[i];
1203 int n= st->nb_index_entries;
1210 int64_t pos= st->index_entries[0].pos;
1211 avio_seek(s->pb, pos + 4, SEEK_SET);
1212 size= avio_rl32(s->pb);
1213 if(pos + size > st->index_entries[1].pos)
1214 last_start= INT64_MAX;
1217 if(st->index_entries[0].pos > last_start)
1218 last_start= st->index_entries[0].pos;
1219 if(st->index_entries[n-1].pos < first_end)
1220 first_end= st->index_entries[n-1].pos;
1222 avio_seek(s->pb, oldpos, SEEK_SET);
1223 return last_start > first_end;
1226 static int avi_load_index(AVFormatContext *s)
1228 AVIContext *avi = s->priv_data;
1229 AVIOContext *pb = s->pb;
1231 int64_t pos= avio_tell(pb);
1234 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1235 goto the_end; // maybe truncated file
1236 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1238 if (pb->eof_reached)
1240 tag = avio_rl32(pb);
1241 size = avio_rl32(pb);
1242 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1249 if (tag == MKTAG('i', 'd', 'x', '1') &&
1250 avi_read_idx1(s, size) >= 0) {
1256 if (avio_skip(pb, size) < 0)
1257 break; // something is wrong here
1260 avio_seek(pb, pos, SEEK_SET);
1264 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1266 AVIStream *ast2 = st2->priv_data;
1267 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1268 av_free_packet(&ast2->sub_pkt);
1269 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1270 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1271 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1274 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1276 AVIContext *avi = s->priv_data;
1282 if (!avi->index_loaded) {
1283 /* we only load the index on demand */
1285 avi->index_loaded = 1;
1287 assert(stream_index>= 0);
1289 st = s->streams[stream_index];
1291 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1295 /* find the position */
1296 pos = st->index_entries[index].pos;
1297 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1299 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1301 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1302 /* One and only one real stream for DV in AVI, and it has video */
1303 /* offsets. Calling with other stream indexes should have failed */
1304 /* the av_index_search_timestamp call above. */
1305 assert(stream_index == 0);
1307 /* Feed the DV video stream version of the timestamp to the */
1308 /* DV demux so it can synthesize correct timestamps. */
1309 ff_dv_offset_reset(avi->dv_demux, timestamp);
1311 avio_seek(s->pb, pos, SEEK_SET);
1312 avi->stream_index= -1;
1316 for(i = 0; i < s->nb_streams; i++) {
1317 AVStream *st2 = s->streams[i];
1318 AVIStream *ast2 = st2->priv_data;
1323 if (ast2->sub_ctx) {
1324 seek_subtitle(st, st2, timestamp);
1328 if (st2->nb_index_entries <= 0)
1331 // assert(st2->codec->block_align);
1332 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1333 index = av_index_search_timestamp(
1335 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1336 flags | AVSEEK_FLAG_BACKWARD);
1340 if(!avi->non_interleaved){
1341 while(index>0 && st2->index_entries[index].pos > pos)
1343 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1347 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1348 /* extract the current frame number */
1349 ast2->frame_offset = st2->index_entries[index].timestamp;
1353 avio_seek(s->pb, pos, SEEK_SET);
1354 avi->stream_index= -1;
1358 static int avi_read_close(AVFormatContext *s)
1361 AVIContext *avi = s->priv_data;
1363 for(i=0;i<s->nb_streams;i++) {
1364 AVStream *st = s->streams[i];
1365 AVIStream *ast = st->priv_data;
1368 av_freep(&ast->sub_ctx->pb);
1369 avformat_close_input(&ast->sub_ctx);
1371 av_free(ast->sub_buffer);
1372 av_free_packet(&ast->sub_pkt);
1376 av_free(avi->dv_demux);
1381 static int avi_probe(AVProbeData *p)
1385 /* check file header */
1386 for(i=0; avi_headers[i][0]; i++)
1387 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1388 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1389 return AVPROBE_SCORE_MAX;
1394 AVInputFormat ff_avi_demuxer = {
1396 .long_name = NULL_IF_CONFIG_SMALL("AVI format"),
1397 .priv_data_size = sizeof(AVIContext),
1398 .read_probe = avi_probe,
1399 .read_header = avi_read_header,
1400 .read_packet = avi_read_packet,
1401 .read_close = avi_read_close,
1402 .read_seek = avi_read_seek,