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
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/opt.h"
37 typedef struct AVIStream {
38 int64_t frame_offset; /* current frame (video) or byte (audio) counter
39 (used to compute the pts) */
45 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
47 int64_t cum_len; /* temporary storage (used during seek) */
49 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
53 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
55 AVFormatContext *sub_ctx;
73 DVDemuxContext* dv_demux;
76 #define MAX_ODML_DEPTH 1000
80 static const AVOption options[] = {
81 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), FF_OPT_TYPE_INT, 1, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
85 static const AVClass demuxer_class = {
89 LIBAVUTIL_VERSION_INT,
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 int avi_load_index(AVFormatContext *s);
103 static int guess_ni_flag(AVFormatContext *s);
105 #define print_tag(str, tag, size) \
106 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
109 (tag >> 16) & 0xff, \
110 (tag >> 24) & 0xff, \
113 static inline int get_duration(AVIStream *ast, int len){
114 if(ast->sample_size){
116 }else if (ast->dshow_block_align){
117 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
122 static int get_riff(AVFormatContext *s, AVIOContext *pb)
124 AVIContext *avi = s->priv_data;
128 /* check RIFF header */
129 avio_read(pb, header, 4);
130 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
131 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
132 avio_read(pb, header+4, 4);
134 for(i=0; avi_headers[i][0]; i++)
135 if(!memcmp(header, avi_headers[i], 8))
137 if(!avi_headers[i][0])
140 if(header[7] == 0x19)
141 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
146 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
147 AVIContext *avi = s->priv_data;
148 AVIOContext *pb = s->pb;
149 int longs_pre_entry= avio_rl16(pb);
150 int index_sub_type = avio_r8(pb);
151 int index_type = avio_r8(pb);
152 int entries_in_use = avio_rl32(pb);
153 int chunk_id = avio_rl32(pb);
154 int64_t base = avio_rl64(pb);
155 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
159 int64_t last_pos= -1;
160 int64_t filesize= avio_size(s->pb);
163 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
164 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
167 if(stream_id >= s->nb_streams || stream_id < 0)
169 st= s->streams[stream_id];
177 if(index_type && longs_pre_entry != 2)
182 if(filesize > 0 && base >= filesize){
183 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
184 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
190 for(i=0; i<entries_in_use; i++){
192 int64_t pos= avio_rl32(pb) + base - 8;
193 int len = avio_rl32(pb);
198 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
203 if(last_pos == pos || pos == base - 8)
204 avi->non_interleaved= 1;
205 if(last_pos != pos && (len || !ast->sample_size))
206 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
208 ast->cum_len += get_duration(ast, len);
213 offset = avio_rl64(pb);
214 avio_rl32(pb); /* size */
215 duration = avio_rl32(pb);
222 if(avi->odml_depth > MAX_ODML_DEPTH){
223 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
227 avio_seek(pb, offset+8, SEEK_SET);
229 read_braindead_odml_indx(s, frame_num);
231 frame_num += duration;
233 avio_seek(pb, pos, SEEK_SET);
240 static void clean_index(AVFormatContext *s){
244 for(i=0; i<s->nb_streams; i++){
245 AVStream *st = s->streams[i];
246 AVIStream *ast = st->priv_data;
247 int n= st->nb_index_entries;
248 int max= ast->sample_size;
249 int64_t pos, size, ts;
251 if(n != 1 || ast->sample_size==0)
254 while(max < 1024) max+=max;
256 pos= st->index_entries[0].pos;
257 size= st->index_entries[0].size;
258 ts= st->index_entries[0].timestamp;
260 for(j=0; j<size; j+=max){
261 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
266 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
268 AVIOContext *pb = s->pb;
269 char key[5] = {0}, *value;
273 if (size == UINT_MAX)
275 value = av_malloc(size+1);
278 avio_read(pb, value, size);
283 return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
284 AV_METADATA_DONT_STRDUP_VAL);
287 static void avi_read_info(AVFormatContext *s, uint64_t end)
289 while (avio_tell(s->pb) < end) {
290 uint32_t tag = avio_rl32(s->pb);
291 uint32_t size = avio_rl32(s->pb);
292 avi_read_tag(s, NULL, tag, size);
296 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
297 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
299 static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
301 char month[4], time[9], buffer[64];
303 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
304 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
305 month, &day, time, &year) == 4) {
307 if (!strcasecmp(month, months[i])) {
308 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
309 year, i+1, day, time);
310 av_metadata_set2(metadata, "creation_time", buffer, 0);
312 } else if (date[4] == '/' && date[7] == '/') {
313 date[4] = date[7] = '-';
314 av_metadata_set2(metadata, "creation_time", date, 0);
318 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
320 while (avio_tell(s->pb) < end) {
321 uint32_t tag = avio_rl32(s->pb);
322 uint32_t size = avio_rl32(s->pb);
324 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
325 uint64_t tag_end = avio_tell(s->pb) + size;
326 while (avio_tell(s->pb) < tag_end) {
327 uint16_t tag = avio_rl16(s->pb);
328 uint16_t size = avio_rl16(s->pb);
329 const char *name = NULL;
330 char buffer[64] = {0};
331 size -= avio_read(s->pb, buffer,
332 FFMIN(size, sizeof(buffer)-1));
334 case 0x03: name = "maker"; break;
335 case 0x04: name = "model"; break;
336 case 0x13: name = "creation_time";
337 if (buffer[4] == ':' && buffer[7] == ':')
338 buffer[4] = buffer[7] = '-';
342 av_metadata_set2(&s->metadata, name, buffer, 0);
343 avio_skip(s->pb, size);
348 avio_skip(s->pb, size);
354 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
356 AVIContext *avi = s->priv_data;
357 AVIOContext *pb = s->pb;
358 unsigned int tag, tag1, handler;
359 int codec_type, stream_index, frame_period;
363 AVIStream *ast = NULL;
364 int avih_width=0, avih_height=0;
365 int amv_file_format=0;
366 uint64_t list_end = 0;
369 avi->stream_index= -1;
371 if (get_riff(s, pb) < 0)
374 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
376 avi->fsize = avio_size(pb);
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 = avio_size(pb);
404 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
407 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
408 avi_read_info(s, list_end);
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 = av_new_stream(s, stream_index);
458 ast = av_mallocz(sizeof(AVIStream));
464 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
466 print_tag("strh", tag1, -1);
468 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
472 * After some consideration -- I don't think we
473 * have to support anything but DV in type1 AVIs.
475 if (s->nb_streams != 1)
478 if (handler != MKTAG('d', 'v', 's', 'd') &&
479 handler != MKTAG('d', 'v', 'h', 'd') &&
480 handler != MKTAG('d', 'v', 's', 'l'))
483 ast = s->streams[0]->priv_data;
484 av_freep(&s->streams[0]->codec->extradata);
485 av_freep(&s->streams[0]->codec);
486 av_freep(&s->streams[0]);
488 if (CONFIG_DV_DEMUXER) {
489 avi->dv_demux = dv_init_demux(s);
493 s->streams[0]->priv_data = ast;
494 avio_skip(pb, 3 * 4);
495 ast->scale = avio_rl32(pb);
496 ast->rate = avio_rl32(pb);
497 avio_skip(pb, 4); /* start time */
499 dv_dur = avio_rl32(pb);
500 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
501 dv_dur *= AV_TIME_BASE;
502 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
505 * else, leave duration alone; timing estimation in utils.c
506 * will make a guess based on bitrate.
509 stream_index = s->nb_streams - 1;
510 avio_skip(pb, size - 9*4);
514 assert(stream_index < s->nb_streams);
515 st->codec->stream_codec_tag= handler;
517 avio_rl32(pb); /* flags */
518 avio_rl16(pb); /* priority */
519 avio_rl16(pb); /* language */
520 avio_rl32(pb); /* initial frame */
521 ast->scale = avio_rl32(pb);
522 ast->rate = avio_rl32(pb);
523 if(!(ast->scale && ast->rate)){
524 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);
527 ast->scale = frame_period;
533 av_set_pts_info(st, 64, ast->scale, ast->rate);
535 ast->cum_len=avio_rl32(pb); /* start */
536 st->nb_frames = avio_rl32(pb);
539 avio_rl32(pb); /* buffer size */
540 avio_rl32(pb); /* quality */
541 ast->sample_size = avio_rl32(pb); /* sample ssize */
542 ast->cum_len *= FFMAX(1, ast->sample_size);
543 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
546 case MKTAG('v', 'i', 'd', 's'):
547 codec_type = AVMEDIA_TYPE_VIDEO;
549 ast->sample_size = 0;
551 case MKTAG('a', 'u', 'd', 's'):
552 codec_type = AVMEDIA_TYPE_AUDIO;
554 case MKTAG('t', 'x', 't', 's'):
555 codec_type = AVMEDIA_TYPE_SUBTITLE;
557 case MKTAG('d', 'a', 't', 's'):
558 codec_type = AVMEDIA_TYPE_DATA;
561 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
564 if(ast->sample_size == 0)
565 st->duration = st->nb_frames;
566 ast->frame_offset= ast->cum_len;
567 avio_skip(pb, size - 12 * 4);
569 case MKTAG('s', 't', 'r', 'f'):
571 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
574 uint64_t cur_pos = avio_tell(pb);
575 if (cur_pos < list_end)
576 size = FFMIN(size, list_end - cur_pos);
577 st = s->streams[stream_index];
579 case AVMEDIA_TYPE_VIDEO:
581 st->codec->width=avih_width;
582 st->codec->height=avih_height;
583 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
584 st->codec->codec_id = CODEC_ID_AMV;
588 tag1 = ff_get_bmp_header(pb, st);
590 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
591 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
592 st->codec->codec_tag = tag1;
593 st->codec->codec_id = CODEC_ID_XSUB;
597 if(size > 10*4 && size<(1<<30)){
598 st->codec->extradata_size= size - 10*4;
599 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
600 if (!st->codec->extradata) {
601 st->codec->extradata_size= 0;
602 return AVERROR(ENOMEM);
604 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
607 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
610 /* Extract palette from extradata if bpp <= 8. */
611 /* This code assumes that extradata contains only palette. */
612 /* This is true for all paletted codecs implemented in FFmpeg. */
613 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
614 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
615 const uint8_t *pal_src;
617 pal_size = FFMIN(pal_size, st->codec->extradata_size);
618 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
620 for (i = 0; i < pal_size/4; i++)
621 ast->pal[i] = AV_RL32(pal_src+4*i);
623 memcpy(ast->pal, pal_src, pal_size);
628 print_tag("video", tag1, 0);
630 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
631 st->codec->codec_tag = tag1;
632 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
633 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
634 // Support "Resolution 1:1" for Avid AVI Codec
635 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
636 st->codec->extradata_size >= 31 &&
637 !memcmp(&st->codec->extradata[28], "1:1", 3))
638 st->codec->codec_id = CODEC_ID_RAWVIDEO;
640 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
641 st->codec->extradata_size+= 9;
642 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
643 if(st->codec->extradata)
644 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
646 st->codec->height= FFABS(st->codec->height);
648 // avio_skip(pb, size - 5 * 4);
650 case AVMEDIA_TYPE_AUDIO:
651 ret = ff_get_wav_header(pb, st->codec, size);
654 ast->dshow_block_align= st->codec->block_align;
655 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
656 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
657 ast->sample_size= st->codec->block_align;
659 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
661 /* Force parsing as several audio frames can be in
662 * one packet and timestamps refer to packet start. */
663 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
664 /* ADTS header is in extradata, AAC without header must be
665 * stored as exact frames. Parser not needed and it will
667 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
668 st->need_parsing = AVSTREAM_PARSE_NONE;
669 /* AVI files with Xan DPCM audio (wrongly) declare PCM
670 * audio in the header but have Axan as stream_code_tag. */
671 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
672 st->codec->codec_id = CODEC_ID_XAN_DPCM;
673 st->codec->codec_tag = 0;
675 if (amv_file_format){
676 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
677 ast->dshow_block_align = 0;
680 case AVMEDIA_TYPE_SUBTITLE:
681 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
682 st->request_probe= 1;
685 st->codec->codec_type = AVMEDIA_TYPE_DATA;
686 st->codec->codec_id= CODEC_ID_NONE;
687 st->codec->codec_tag= 0;
693 case MKTAG('i', 'n', 'd', 'x'):
695 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml){
696 read_braindead_odml_indx(s, 0);
698 avio_seek(pb, i+size, SEEK_SET);
700 case MKTAG('v', 'p', 'r', 'p'):
701 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
702 AVRational active, active_aspect;
704 st = s->streams[stream_index];
711 active_aspect.den= avio_rl16(pb);
712 active_aspect.num= avio_rl16(pb);
713 active.num = avio_rl32(pb);
714 active.den = avio_rl32(pb);
715 avio_rl32(pb); //nbFieldsPerFrame
717 if(active_aspect.num && active_aspect.den && active.num && active.den){
718 st->sample_aspect_ratio= av_div_q(active_aspect, active);
719 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
725 case MKTAG('s', 't', 'r', 'n'):
727 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
732 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
733 "I will ignore it and try to continue anyway.\n");
734 avi->movi_list = avio_tell(pb) - 4;
735 avi->movi_end = avio_size(pb);
745 /* check stream number */
746 if (stream_index != s->nb_streams - 1) {
751 if(!avi->index_loaded && pb->seekable)
753 avi->index_loaded = 1;
754 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
755 for(i=0; i<s->nb_streams; i++){
756 AVStream *st = s->streams[i];
757 if(st->nb_index_entries)
760 // DV-in-AVI cannot be non-interleaved, if set this must be
763 avi->non_interleaved=0;
764 if(i==s->nb_streams && avi->non_interleaved) {
765 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
766 avi->non_interleaved=0;
769 if(avi->non_interleaved) {
770 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
774 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
779 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
780 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
782 int score = AVPROBE_SCORE_MAX / 2, ret;
783 AVIStream *ast = st->priv_data;
784 AVInputFormat *sub_demuxer;
785 AVRational time_base;
786 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
788 0, NULL, NULL, NULL, NULL);
790 unsigned int desc_len = avio_rl32(pb);
792 if (desc_len > pb->buf_end - pb->buf_ptr)
795 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
796 avio_skip(pb, desc_len - ret);
798 av_metadata_set2(&st->metadata, "title", desc, 0);
800 avio_rl16(pb); /* flags? */
801 avio_rl32(pb); /* data size */
803 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
804 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
807 if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
808 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
809 *st->codec = *ast->sub_ctx->streams[0]->codec;
810 ast->sub_ctx->streams[0]->codec->extradata = NULL;
811 time_base = ast->sub_ctx->streams[0]->time_base;
812 av_set_pts_info(st, 64, time_base.num, time_base.den);
814 ast->sub_buffer = pkt->data;
815 memset(pkt, 0, sizeof(*pkt));
823 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
826 AVIStream *ast, *next_ast = next_st->priv_data;
827 int64_t ts, next_ts, ts_min = INT64_MAX;
828 AVStream *st, *sub_st = NULL;
831 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
834 for (i=0; i<s->nb_streams; i++) {
837 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
838 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
839 if (ts <= next_ts && ts < ts_min) {
847 ast = sub_st->priv_data;
849 pkt->stream_index = sub_st->index;
850 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
851 ast->sub_pkt.data = NULL;
856 static int get_stream_idx(int *d){
857 if( d[0] >= '0' && d[0] <= '9'
858 && d[1] >= '0' && d[1] <= '9'){
859 return (d[0] - '0') * 10 + (d[1] - '0');
861 return 100; //invalid stream ID
865 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
867 AVIContext *avi = s->priv_data;
868 AVIOContext *pb = s->pb;
874 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
875 int size = dv_get_packet(avi->dv_demux, pkt);
880 if(avi->non_interleaved){
881 int best_stream_index = 0;
882 AVStream *best_st= NULL;
884 int64_t best_ts= INT64_MAX;
887 for(i=0; i<s->nb_streams; i++){
888 AVStream *st = s->streams[i];
889 AVIStream *ast = st->priv_data;
890 int64_t ts= ast->frame_offset;
893 if(!st->nb_index_entries)
896 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
897 if(!ast->remaining && ts > last_ts)
900 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
902 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
906 best_stream_index= i;
912 best_ast = best_st->priv_data;
913 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
914 if(best_ast->remaining)
915 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
917 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
919 best_ast->frame_offset= best_st->index_entries[i].timestamp;
922 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
924 int64_t pos= best_st->index_entries[i].pos;
925 pos += best_ast->packet_size - best_ast->remaining;
926 avio_seek(s->pb, pos + 8, SEEK_SET);
927 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
929 assert(best_ast->remaining <= best_ast->packet_size);
931 avi->stream_index= best_stream_index;
932 if(!best_ast->remaining)
933 best_ast->packet_size=
934 best_ast->remaining= best_st->index_entries[i].size;
939 if(avi->stream_index >= 0){
940 AVStream *st= s->streams[ avi->stream_index ];
941 AVIStream *ast= st->priv_data;
944 if(get_subtitle_pkt(s, st, pkt))
947 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
949 else if(ast->sample_size < 32)
950 // arbitrary multiplier to avoid tiny packets for raw PCM data
951 size= 1024*ast->sample_size;
953 size= ast->sample_size;
955 if(size > ast->remaining)
956 size= ast->remaining;
957 avi->last_pkt_pos= avio_tell(pb);
958 err= av_get_packet(pb, pkt, size);
962 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
964 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
966 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
968 memcpy(pal, ast->pal, AVPALETTE_SIZE);
973 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
974 dstr = pkt->destruct;
975 size = dv_produce_packet(avi->dv_demux, pkt,
976 pkt->data, pkt->size, pkt->pos);
977 pkt->destruct = dstr;
978 pkt->flags |= AV_PKT_FLAG_KEY;
981 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
982 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
984 avi->stream_index = -1;
988 /* XXX: How to handle B-frames in AVI? */
989 pkt->dts = ast->frame_offset;
990 // pkt->dts += ast->start;
992 pkt->dts /= ast->sample_size;
993 //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);
994 pkt->stream_index = avi->stream_index;
996 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
999 assert(st->index_entries);
1001 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1002 e= &st->index_entries[index];
1004 if(index >= 0 && e->timestamp == ast->frame_offset){
1005 if (index == st->nb_index_entries-1){
1009 for(i=0; i<FFMIN(size,256); i++){
1010 if(st->codec->codec_id == CODEC_ID_MPEG4){
1012 key= !(pkt->data[i]&0xC0);
1017 state= (state<<8) + pkt->data[i];
1020 e->flags &= ~AVINDEX_KEYFRAME;
1022 if (e->flags & AVINDEX_KEYFRAME)
1023 pkt->flags |= AV_PKT_FLAG_KEY;
1026 pkt->flags |= AV_PKT_FLAG_KEY;
1028 ast->frame_offset += get_duration(ast, pkt->size);
1030 ast->remaining -= size;
1031 if(!ast->remaining){
1032 avi->stream_index= -1;
1033 ast->packet_size= 0;
1036 if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
1037 av_free_packet(pkt);
1045 memset(d, -1, sizeof(int)*8);
1046 for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
1053 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1055 n= get_stream_idx(d+2);
1056 //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);
1057 if(i + (uint64_t)size > avi->fsize || d[0]<0)
1061 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1063 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1064 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1065 avio_skip(pb, size);
1066 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1071 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1076 n= get_stream_idx(d);
1078 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1081 //detect ##ix chunk and skip
1082 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1083 avio_skip(pb, size);
1088 if(n < s->nb_streams){
1092 ast = st->priv_data;
1094 if(s->nb_streams>=2){
1095 AVStream *st1 = s->streams[1];
1096 AVIStream *ast1= st1->priv_data;
1097 //workaround for broken small-file-bug402.avi
1098 if( d[2] == 'w' && d[3] == 'b'
1100 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1101 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1102 && ast->prefix == 'd'*256+'c'
1103 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1108 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1113 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1114 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1115 || st->discard >= AVDISCARD_ALL){
1116 ast->frame_offset += get_duration(ast, size);
1117 avio_skip(pb, size);
1121 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1122 int k = avio_r8(pb);
1123 int last = (k + avio_r8(pb) - 1) & 0xFF;
1125 avio_rl16(pb); //flags
1127 for (; k <= last; k++)
1128 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1131 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1132 d[2]*256+d[3] == ast->prefix /*||
1133 (d[2] == 'd' && d[3] == 'c') ||
1134 (d[2] == 'w' && d[3] == 'b')*/) {
1136 //av_log(s, AV_LOG_DEBUG, "OK\n");
1137 if(d[2]*256+d[3] == ast->prefix)
1138 ast->prefix_count++;
1140 ast->prefix= d[2]*256+d[3];
1141 ast->prefix_count= 0;
1144 avi->stream_index= n;
1145 ast->packet_size= size + 8;
1146 ast->remaining= size;
1148 if(size || !ast->sample_size){
1149 uint64_t pos= avio_tell(pb) - 8;
1150 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1151 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1162 /* XXX: We make the implicit supposition that the positions are sorted
1164 static int avi_read_idx1(AVFormatContext *s, int size)
1166 AVIContext *avi = s->priv_data;
1167 AVIOContext *pb = s->pb;
1168 int nb_index_entries, i;
1171 unsigned int index, tag, flags, pos, len;
1172 unsigned last_pos= -1;
1174 nb_index_entries = size / 16;
1175 if (nb_index_entries <= 0)
1178 /* Read the entries and sort them in each stream component. */
1179 for(i = 0; i < nb_index_entries; i++) {
1180 tag = avio_rl32(pb);
1181 flags = avio_rl32(pb);
1182 pos = avio_rl32(pb);
1183 len = avio_rl32(pb);
1184 #if defined(DEBUG_SEEK)
1185 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1186 i, tag, flags, pos, len);
1188 if(i==0 && pos > avi->movi_list)
1189 avi->movi_list= 0; //FIXME better check
1190 pos += avi->movi_list;
1192 index = ((tag & 0xff) - '0') * 10;
1193 index += ((tag >> 8) & 0xff) - '0';
1194 if (index >= s->nb_streams)
1196 st = s->streams[index];
1197 ast = st->priv_data;
1199 #if defined(DEBUG_SEEK)
1200 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1206 avi->non_interleaved= 1;
1207 else if(len || !ast->sample_size)
1208 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1209 ast->cum_len += get_duration(ast, len);
1215 static int guess_ni_flag(AVFormatContext *s){
1217 int64_t last_start=0;
1218 int64_t first_end= INT64_MAX;
1219 int64_t oldpos= avio_tell(s->pb);
1221 for(i=0; i<s->nb_streams; i++){
1222 AVStream *st = s->streams[i];
1223 int n= st->nb_index_entries;
1230 int64_t pos= st->index_entries[0].pos;
1231 avio_seek(s->pb, pos + 4, SEEK_SET);
1232 size= avio_rl32(s->pb);
1233 if(pos + size > st->index_entries[1].pos)
1234 last_start= INT64_MAX;
1237 if(st->index_entries[0].pos > last_start)
1238 last_start= st->index_entries[0].pos;
1239 if(st->index_entries[n-1].pos < first_end)
1240 first_end= st->index_entries[n-1].pos;
1242 avio_seek(s->pb, oldpos, SEEK_SET);
1243 return last_start > first_end;
1246 static int avi_load_index(AVFormatContext *s)
1248 AVIContext *avi = s->priv_data;
1249 AVIOContext *pb = s->pb;
1251 int64_t pos= avio_tell(pb);
1254 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1255 goto the_end; // maybe truncated file
1257 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1262 tag = avio_rl32(pb);
1263 size = avio_rl32(pb);
1265 printf("tag=%c%c%c%c size=0x%x\n",
1273 case MKTAG('i', 'd', 'x', '1'):
1274 if (avi_read_idx1(s, size) < 0)
1282 if (avio_skip(pb, size) < 0)
1283 goto the_end; // something is wrong here
1288 avio_seek(pb, pos, SEEK_SET);
1292 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1294 AVIStream *ast2 = st2->priv_data;
1295 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1296 av_free_packet(&ast2->sub_pkt);
1297 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1298 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1299 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1302 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1304 AVIContext *avi = s->priv_data;
1307 int64_t pos, pos_min;
1310 if (!avi->index_loaded) {
1311 /* we only load the index on demand */
1313 avi->index_loaded = 1;
1315 assert(stream_index>= 0);
1317 st = s->streams[stream_index];
1319 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1323 /* find the position */
1324 pos = st->index_entries[index].pos;
1325 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1327 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1329 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1330 /* One and only one real stream for DV in AVI, and it has video */
1331 /* offsets. Calling with other stream indexes should have failed */
1332 /* the av_index_search_timestamp call above. */
1333 assert(stream_index == 0);
1335 /* Feed the DV video stream version of the timestamp to the */
1336 /* DV demux so it can synthesize correct timestamps. */
1337 dv_offset_reset(avi->dv_demux, timestamp);
1339 avio_seek(s->pb, pos, SEEK_SET);
1340 avi->stream_index= -1;
1345 for(i = 0; i < s->nb_streams; i++) {
1346 AVStream *st2 = s->streams[i];
1347 AVIStream *ast2 = st2->priv_data;
1352 if (ast2->sub_ctx) {
1353 seek_subtitle(st, st2, timestamp);
1357 if (st2->nb_index_entries <= 0)
1360 // assert(st2->codec->block_align);
1361 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1362 index = av_index_search_timestamp(
1364 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1365 flags | AVSEEK_FLAG_BACKWARD);
1368 ast2->seek_pos= st2->index_entries[index].pos;
1369 pos_min= FFMIN(pos_min,ast2->seek_pos);
1371 for(i = 0; i < s->nb_streams; i++) {
1372 AVStream *st2 = s->streams[i];
1373 AVIStream *ast2 = st2->priv_data;
1375 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1378 index = av_index_search_timestamp(
1380 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1381 flags | AVSEEK_FLAG_BACKWARD);
1384 while(index>0 && st2->index_entries[index-1].pos >= pos_min)
1386 ast2->frame_offset = st2->index_entries[index].timestamp;
1390 avio_seek(s->pb, pos_min, SEEK_SET);
1391 avi->stream_index= -1;
1395 static int avi_read_close(AVFormatContext *s)
1398 AVIContext *avi = s->priv_data;
1400 for(i=0;i<s->nb_streams;i++) {
1401 AVStream *st = s->streams[i];
1402 AVIStream *ast = st->priv_data;
1405 av_freep(&ast->sub_ctx->pb);
1406 av_close_input_stream(ast->sub_ctx);
1408 av_free(ast->sub_buffer);
1409 av_free_packet(&ast->sub_pkt);
1413 av_free(avi->dv_demux);
1418 static int avi_probe(AVProbeData *p)
1422 /* check file header */
1423 for(i=0; avi_headers[i][0]; i++)
1424 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1425 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1426 return AVPROBE_SCORE_MAX;
1431 AVInputFormat ff_avi_demuxer = {
1433 NULL_IF_CONFIG_SMALL("AVI format"),
1440 .priv_class = &demuxer_class,