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/mathematics.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/dict.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;
72 DVDemuxContext* dv_demux;
75 #define MAX_ODML_DEPTH 1000
80 static const AVOption options[] = {
81 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), FF_OPT_TYPE_INT, {.dbl = 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);
162 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
163 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
165 if(stream_id >= s->nb_streams || stream_id < 0)
167 st= s->streams[stream_id];
175 if(index_type && longs_pre_entry != 2)
180 if(filesize > 0 && base >= filesize){
181 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
182 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
188 for(i=0; i<entries_in_use; i++){
190 int64_t pos= avio_rl32(pb) + base - 8;
191 int len = avio_rl32(pb);
196 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
201 if(last_pos == pos || pos == base - 8)
202 avi->non_interleaved= 1;
203 if(last_pos != pos && (len || !ast->sample_size))
204 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
206 ast->cum_len += get_duration(ast, len);
211 offset = avio_rl64(pb);
212 avio_rl32(pb); /* size */
213 duration = avio_rl32(pb);
220 if(avi->odml_depth > MAX_ODML_DEPTH){
221 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
225 avio_seek(pb, offset+8, SEEK_SET);
227 read_braindead_odml_indx(s, frame_num);
229 frame_num += duration;
231 avio_seek(pb, pos, SEEK_SET);
238 static void clean_index(AVFormatContext *s){
242 for(i=0; i<s->nb_streams; i++){
243 AVStream *st = s->streams[i];
244 AVIStream *ast = st->priv_data;
245 int n= st->nb_index_entries;
246 int max= ast->sample_size;
247 int64_t pos, size, ts;
249 if(n != 1 || ast->sample_size==0)
252 while(max < 1024) max+=max;
254 pos= st->index_entries[0].pos;
255 size= st->index_entries[0].size;
256 ts= st->index_entries[0].timestamp;
258 for(j=0; j<size; j+=max){
259 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
264 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
266 AVIOContext *pb = s->pb;
267 char key[5] = {0}, *value;
271 if (size == UINT_MAX)
273 value = av_malloc(size+1);
276 avio_read(pb, value, size);
281 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
282 AV_DICT_DONT_STRDUP_VAL);
285 static void avi_read_info(AVFormatContext *s, uint64_t end)
287 while (avio_tell(s->pb) < end) {
288 uint32_t tag = avio_rl32(s->pb);
289 uint32_t size = avio_rl32(s->pb);
290 avi_read_tag(s, NULL, tag, size);
294 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
295 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
297 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
299 char month[4], time[9], buffer[64];
301 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
302 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
303 month, &day, time, &year) == 4) {
305 if (!strcasecmp(month, months[i])) {
306 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
307 year, i+1, day, time);
308 av_dict_set(metadata, "creation_time", buffer, 0);
310 } else if (date[4] == '/' && date[7] == '/') {
311 date[4] = date[7] = '-';
312 av_dict_set(metadata, "creation_time", date, 0);
316 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
318 while (avio_tell(s->pb) < end) {
319 uint32_t tag = avio_rl32(s->pb);
320 uint32_t size = avio_rl32(s->pb);
322 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
323 uint64_t tag_end = avio_tell(s->pb) + size;
324 while (avio_tell(s->pb) < tag_end) {
325 uint16_t tag = avio_rl16(s->pb);
326 uint16_t size = avio_rl16(s->pb);
327 const char *name = NULL;
328 char buffer[64] = {0};
329 size -= avio_read(s->pb, buffer,
330 FFMIN(size, sizeof(buffer)-1));
332 case 0x03: name = "maker"; break;
333 case 0x04: name = "model"; break;
334 case 0x13: name = "creation_time";
335 if (buffer[4] == ':' && buffer[7] == ':')
336 buffer[4] = buffer[7] = '-';
340 av_dict_set(&s->metadata, name, buffer, 0);
341 avio_skip(s->pb, size);
346 avio_skip(s->pb, size);
352 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
354 AVIContext *avi = s->priv_data;
355 AVIOContext *pb = s->pb;
356 unsigned int tag, tag1, handler;
357 int codec_type, stream_index, frame_period;
361 AVIStream *ast = NULL;
362 int avih_width=0, avih_height=0;
363 int amv_file_format=0;
364 uint64_t list_end = 0;
367 avi->stream_index= -1;
369 if (get_riff(s, pb) < 0)
372 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
374 avi->fsize = avio_size(pb);
376 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
386 size = avio_rl32(pb);
388 print_tag("tag", tag, size);
391 case MKTAG('L', 'I', 'S', 'T'):
392 list_end = avio_tell(pb) + size;
393 /* Ignored, except at start of video packets. */
394 tag1 = avio_rl32(pb);
396 print_tag("list", tag1, 0);
398 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
399 avi->movi_list = avio_tell(pb) - 4;
400 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
401 else avi->movi_end = avio_size(pb);
402 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
405 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
406 avi_read_info(s, list_end);
407 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
408 avi_read_nikon(s, list_end);
411 case MKTAG('I', 'D', 'I', 'T'): {
412 unsigned char date[64] = {0};
414 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
416 avi_metadata_creation_time(&s->metadata, date);
419 case MKTAG('d', 'm', 'l', 'h'):
421 avio_skip(pb, size + (size & 1));
423 case MKTAG('a', 'm', 'v', 'h'):
425 case MKTAG('a', 'v', 'i', 'h'):
427 /* using frame_period is bad idea */
428 frame_period = avio_rl32(pb);
429 avio_rl32(pb); /* max. bytes per second */
431 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
433 avio_skip(pb, 2 * 4);
436 avih_width=avio_rl32(pb);
437 avih_height=avio_rl32(pb);
439 avio_skip(pb, size - 10 * 4);
441 case MKTAG('s', 't', 'r', 'h'):
444 tag1 = avio_rl32(pb);
445 handler = avio_rl32(pb); /* codec tag */
447 if(tag1 == MKTAG('p', 'a', 'd', 's')){
448 avio_skip(pb, size - 8);
452 st = av_new_stream(s, stream_index);
456 ast = av_mallocz(sizeof(AVIStream));
462 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
464 print_tag("strh", tag1, -1);
466 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
470 * After some consideration -- I don't think we
471 * have to support anything but DV in type1 AVIs.
473 if (s->nb_streams != 1)
476 if (handler != MKTAG('d', 'v', 's', 'd') &&
477 handler != MKTAG('d', 'v', 'h', 'd') &&
478 handler != MKTAG('d', 'v', 's', 'l'))
481 ast = s->streams[0]->priv_data;
482 av_freep(&s->streams[0]->codec->extradata);
483 av_freep(&s->streams[0]->codec);
484 av_freep(&s->streams[0]);
486 if (CONFIG_DV_DEMUXER) {
487 avi->dv_demux = dv_init_demux(s);
491 s->streams[0]->priv_data = ast;
492 avio_skip(pb, 3 * 4);
493 ast->scale = avio_rl32(pb);
494 ast->rate = avio_rl32(pb);
495 avio_skip(pb, 4); /* start time */
497 dv_dur = avio_rl32(pb);
498 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
499 dv_dur *= AV_TIME_BASE;
500 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
503 * else, leave duration alone; timing estimation in utils.c
504 * will make a guess based on bitrate.
507 stream_index = s->nb_streams - 1;
508 avio_skip(pb, size - 9*4);
512 assert(stream_index < s->nb_streams);
513 st->codec->stream_codec_tag= handler;
515 avio_rl32(pb); /* flags */
516 avio_rl16(pb); /* priority */
517 avio_rl16(pb); /* language */
518 avio_rl32(pb); /* initial frame */
519 ast->scale = avio_rl32(pb);
520 ast->rate = avio_rl32(pb);
521 if(!(ast->scale && ast->rate)){
522 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);
525 ast->scale = frame_period;
531 av_set_pts_info(st, 64, ast->scale, ast->rate);
533 ast->cum_len=avio_rl32(pb); /* start */
534 st->nb_frames = avio_rl32(pb);
537 avio_rl32(pb); /* buffer size */
538 avio_rl32(pb); /* quality */
539 ast->sample_size = avio_rl32(pb); /* sample ssize */
540 ast->cum_len *= FFMAX(1, ast->sample_size);
541 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
544 case MKTAG('v', 'i', 'd', 's'):
545 codec_type = AVMEDIA_TYPE_VIDEO;
547 ast->sample_size = 0;
549 case MKTAG('a', 'u', 'd', 's'):
550 codec_type = AVMEDIA_TYPE_AUDIO;
552 case MKTAG('t', 'x', 't', 's'):
553 codec_type = AVMEDIA_TYPE_SUBTITLE;
555 case MKTAG('d', 'a', 't', 's'):
556 codec_type = AVMEDIA_TYPE_DATA;
559 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
561 if(ast->sample_size == 0)
562 st->duration = st->nb_frames;
563 ast->frame_offset= ast->cum_len;
564 avio_skip(pb, size - 12 * 4);
566 case MKTAG('s', 't', 'r', 'f'):
568 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
571 uint64_t cur_pos = avio_tell(pb);
572 if (cur_pos < list_end)
573 size = FFMIN(size, list_end - cur_pos);
574 st = s->streams[stream_index];
576 case AVMEDIA_TYPE_VIDEO:
578 st->codec->width=avih_width;
579 st->codec->height=avih_height;
580 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
581 st->codec->codec_id = CODEC_ID_AMV;
585 tag1 = ff_get_bmp_header(pb, st);
587 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
588 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
589 st->codec->codec_tag = tag1;
590 st->codec->codec_id = CODEC_ID_XSUB;
594 if(size > 10*4 && size<(1<<30)){
595 st->codec->extradata_size= size - 10*4;
596 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
597 if (!st->codec->extradata) {
598 st->codec->extradata_size= 0;
599 return AVERROR(ENOMEM);
601 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
604 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
607 /* Extract palette from extradata if bpp <= 8. */
608 /* This code assumes that extradata contains only palette. */
609 /* This is true for all paletted codecs implemented in FFmpeg. */
610 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
611 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
612 const uint8_t *pal_src;
614 pal_size = FFMIN(pal_size, st->codec->extradata_size);
615 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
617 for (i = 0; i < pal_size/4; i++)
618 ast->pal[i] = AV_RL32(pal_src+4*i);
620 memcpy(ast->pal, pal_src, pal_size);
625 print_tag("video", tag1, 0);
627 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
628 st->codec->codec_tag = tag1;
629 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
630 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
631 // Support "Resolution 1:1" for Avid AVI Codec
632 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
633 st->codec->extradata_size >= 31 &&
634 !memcmp(&st->codec->extradata[28], "1:1", 3))
635 st->codec->codec_id = CODEC_ID_RAWVIDEO;
637 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
638 st->codec->extradata_size+= 9;
639 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
640 if(st->codec->extradata)
641 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
643 st->codec->height= FFABS(st->codec->height);
645 // avio_skip(pb, size - 5 * 4);
647 case AVMEDIA_TYPE_AUDIO:
648 ret = ff_get_wav_header(pb, st->codec, size);
651 ast->dshow_block_align= st->codec->block_align;
652 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
653 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
654 ast->sample_size= st->codec->block_align;
656 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
658 /* Force parsing as several audio frames can be in
659 * one packet and timestamps refer to packet start. */
660 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
661 /* ADTS header is in extradata, AAC without header must be
662 * stored as exact frames. Parser not needed and it will
664 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
665 st->need_parsing = AVSTREAM_PARSE_NONE;
666 /* AVI files with Xan DPCM audio (wrongly) declare PCM
667 * audio in the header but have Axan as stream_code_tag. */
668 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
669 st->codec->codec_id = CODEC_ID_XAN_DPCM;
670 st->codec->codec_tag = 0;
671 ast->dshow_block_align = 0;
673 if (amv_file_format){
674 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
675 ast->dshow_block_align = 0;
678 case AVMEDIA_TYPE_SUBTITLE:
679 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
680 st->request_probe= 1;
683 st->codec->codec_type = AVMEDIA_TYPE_DATA;
684 st->codec->codec_id= CODEC_ID_NONE;
685 st->codec->codec_tag= 0;
691 case MKTAG('i', 'n', 'd', 'x'):
693 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&
694 read_braindead_odml_indx(s, 0) < 0 && s->error_recognition >= FF_ER_EXPLODE){
696 avio_seek(pb, i+size, SEEK_SET);
698 case MKTAG('v', 'p', 'r', 'p'):
699 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
700 AVRational active, active_aspect;
702 st = s->streams[stream_index];
709 active_aspect.den= avio_rl16(pb);
710 active_aspect.num= avio_rl16(pb);
711 active.num = avio_rl32(pb);
712 active.den = avio_rl32(pb);
713 avio_rl32(pb); //nbFieldsPerFrame
715 if(active_aspect.num && active_aspect.den && active.num && active.den){
716 st->sample_aspect_ratio= av_div_q(active_aspect, active);
717 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
723 case MKTAG('s', 't', 'r', 'n'):
725 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
730 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
731 "I will ignore it and try to continue anyway.\n");
732 if (s->error_recognition >= FF_ER_EXPLODE) goto fail;
733 avi->movi_list = avio_tell(pb) - 4;
734 avi->movi_end = avio_size(pb);
744 /* check stream number */
745 if (stream_index != s->nb_streams - 1) {
750 if(!avi->index_loaded && pb->seekable)
752 avi->index_loaded = 1;
753 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
754 for(i=0; i<s->nb_streams; i++){
755 AVStream *st = s->streams[i];
756 if(st->nb_index_entries)
759 // DV-in-AVI cannot be non-interleaved, if set this must be
762 avi->non_interleaved=0;
763 if(i==s->nb_streams && avi->non_interleaved) {
764 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
765 avi->non_interleaved=0;
768 if(avi->non_interleaved) {
769 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
773 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
778 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
779 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
781 int score = AVPROBE_SCORE_MAX / 2, ret;
782 AVIStream *ast = st->priv_data;
783 AVInputFormat *sub_demuxer;
784 AVRational time_base;
785 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
787 0, NULL, NULL, NULL, NULL);
789 unsigned int desc_len = avio_rl32(pb);
791 if (desc_len > pb->buf_end - pb->buf_ptr)
794 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
795 avio_skip(pb, desc_len - ret);
797 av_dict_set(&st->metadata, "title", desc, 0);
799 avio_rl16(pb); /* flags? */
800 avio_rl32(pb); /* data size */
802 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
803 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
806 if (!(ast->sub_ctx = avformat_alloc_context()))
809 ast->sub_ctx->pb = pb;
810 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
811 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
812 *st->codec = *ast->sub_ctx->streams[0]->codec;
813 ast->sub_ctx->streams[0]->codec->extradata = NULL;
814 time_base = ast->sub_ctx->streams[0]->time_base;
815 av_set_pts_info(st, 64, time_base.num, time_base.den);
817 ast->sub_buffer = pkt->data;
818 memset(pkt, 0, sizeof(*pkt));
826 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
829 AVIStream *ast, *next_ast = next_st->priv_data;
830 int64_t ts, next_ts, ts_min = INT64_MAX;
831 AVStream *st, *sub_st = NULL;
834 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
837 for (i=0; i<s->nb_streams; i++) {
840 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
841 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
842 if (ts <= next_ts && ts < ts_min) {
850 ast = sub_st->priv_data;
852 pkt->stream_index = sub_st->index;
853 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
854 ast->sub_pkt.data = NULL;
859 static int get_stream_idx(int *d){
860 if( d[0] >= '0' && d[0] <= '9'
861 && d[1] >= '0' && d[1] <= '9'){
862 return (d[0] - '0') * 10 + (d[1] - '0');
864 return 100; //invalid stream ID
868 static int avi_sync(AVFormatContext *s, int exit_early)
870 AVIContext *avi = s->priv_data;
871 AVIOContext *pb = s->pb;
877 memset(d, -1, sizeof(int)*8);
878 for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
885 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
887 n= get_stream_idx(d+2);
888 //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);
889 if(i + (uint64_t)size > avi->fsize || d[0]<0)
893 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
895 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
896 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
898 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
903 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
908 n= get_stream_idx(d);
910 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
913 //detect ##ix chunk and skip
914 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
920 if(n < s->nb_streams){
926 if(s->nb_streams>=2){
927 AVStream *st1 = s->streams[1];
928 AVIStream *ast1= st1->priv_data;
929 //workaround for broken small-file-bug402.avi
930 if( d[2] == 'w' && d[3] == 'b'
932 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
933 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
934 && ast->prefix == 'd'*256+'c'
935 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
940 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
945 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
946 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
947 || st->discard >= AVDISCARD_ALL){
949 ast->frame_offset += get_duration(ast, size);
955 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
957 int last = (k + avio_r8(pb) - 1) & 0xFF;
959 avio_rl16(pb); //flags
961 for (; k <= last; k++)
962 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
965 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
966 d[2]*256+d[3] == ast->prefix /*||
967 (d[2] == 'd' && d[3] == 'c') ||
968 (d[2] == 'w' && d[3] == 'b')*/) {
972 //av_log(s, AV_LOG_DEBUG, "OK\n");
973 if(d[2]*256+d[3] == ast->prefix)
976 ast->prefix= d[2]*256+d[3];
977 ast->prefix_count= 0;
980 avi->stream_index= n;
981 ast->packet_size= size + 8;
982 ast->remaining= size;
984 if(size || !ast->sample_size){
985 uint64_t pos= avio_tell(pb) - 8;
986 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
987 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
998 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1000 AVIContext *avi = s->priv_data;
1001 AVIOContext *pb = s->pb;
1005 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1006 int size = dv_get_packet(avi->dv_demux, pkt);
1011 if(avi->non_interleaved){
1012 int best_stream_index = 0;
1013 AVStream *best_st= NULL;
1014 AVIStream *best_ast;
1015 int64_t best_ts= INT64_MAX;
1018 for(i=0; i<s->nb_streams; i++){
1019 AVStream *st = s->streams[i];
1020 AVIStream *ast = st->priv_data;
1021 int64_t ts= ast->frame_offset;
1024 if(!st->nb_index_entries)
1027 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1028 if(!ast->remaining && ts > last_ts)
1031 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
1033 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
1037 best_stream_index= i;
1043 best_ast = best_st->priv_data;
1044 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
1045 if(best_ast->remaining)
1046 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
1048 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1050 best_ast->frame_offset= best_st->index_entries[i].timestamp;
1053 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
1055 int64_t pos= best_st->index_entries[i].pos;
1056 pos += best_ast->packet_size - best_ast->remaining;
1057 avio_seek(s->pb, pos + 8, SEEK_SET);
1058 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
1060 assert(best_ast->remaining <= best_ast->packet_size);
1062 avi->stream_index= best_stream_index;
1063 if(!best_ast->remaining)
1064 best_ast->packet_size=
1065 best_ast->remaining= best_st->index_entries[i].size;
1070 if(avi->stream_index >= 0){
1071 AVStream *st= s->streams[ avi->stream_index ];
1072 AVIStream *ast= st->priv_data;
1075 if(get_subtitle_pkt(s, st, pkt))
1078 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1080 else if(ast->sample_size < 32)
1081 // arbitrary multiplier to avoid tiny packets for raw PCM data
1082 size= 1024*ast->sample_size;
1084 size= ast->sample_size;
1086 if(size > ast->remaining)
1087 size= ast->remaining;
1088 avi->last_pkt_pos= avio_tell(pb);
1089 err= av_get_packet(pb, pkt, size);
1093 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
1095 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
1097 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
1099 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1104 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1105 dstr = pkt->destruct;
1106 size = dv_produce_packet(avi->dv_demux, pkt,
1107 pkt->data, pkt->size, pkt->pos);
1108 pkt->destruct = dstr;
1109 pkt->flags |= AV_PKT_FLAG_KEY;
1111 av_free_packet(pkt);
1112 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
1113 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1114 ast->frame_offset++;
1115 avi->stream_index = -1;
1119 /* XXX: How to handle B-frames in AVI? */
1120 pkt->dts = ast->frame_offset;
1121 // pkt->dts += ast->start;
1122 if(ast->sample_size)
1123 pkt->dts /= ast->sample_size;
1124 //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);
1125 pkt->stream_index = avi->stream_index;
1127 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1130 assert(st->index_entries);
1132 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1133 e= &st->index_entries[index];
1135 if(index >= 0 && e->timestamp == ast->frame_offset){
1136 if (index == st->nb_index_entries-1){
1140 for(i=0; i<FFMIN(size,256); i++){
1141 if(st->codec->codec_id == CODEC_ID_MPEG4){
1143 key= !(pkt->data[i]&0xC0);
1148 state= (state<<8) + pkt->data[i];
1151 e->flags &= ~AVINDEX_KEYFRAME;
1153 if (e->flags & AVINDEX_KEYFRAME)
1154 pkt->flags |= AV_PKT_FLAG_KEY;
1157 pkt->flags |= AV_PKT_FLAG_KEY;
1159 ast->frame_offset += get_duration(ast, pkt->size);
1161 ast->remaining -= size;
1162 if(!ast->remaining){
1163 avi->stream_index= -1;
1164 ast->packet_size= 0;
1167 if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
1168 av_free_packet(pkt);
1173 if(!avi->non_interleaved && st->nb_index_entries>1){
1174 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1176 if(avi->dts_max - dts > 2*AV_TIME_BASE){
1177 avi->non_interleaved= 1;
1178 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1179 }else if(avi->dts_max < dts)
1186 if ((err = avi_sync(s, 0)) < 0)
1191 /* XXX: We make the implicit supposition that the positions are sorted
1193 static int avi_read_idx1(AVFormatContext *s, int size)
1195 AVIContext *avi = s->priv_data;
1196 AVIOContext *pb = s->pb;
1197 int nb_index_entries, i;
1200 unsigned int index, tag, flags, pos, len, first_packet = 1;
1201 unsigned last_pos= -1;
1202 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1204 nb_index_entries = size / 16;
1205 if (nb_index_entries <= 0)
1208 idx1_pos = avio_tell(pb);
1209 avio_seek(pb, avi->movi_list+4, SEEK_SET);
1210 if (avi_sync(s, 1) == 0) {
1211 first_packet_pos = avio_tell(pb) - 8;
1213 avi->stream_index = -1;
1214 avio_seek(pb, idx1_pos, SEEK_SET);
1216 /* Read the entries and sort them in each stream component. */
1217 for(i = 0; i < nb_index_entries; i++) {
1218 tag = avio_rl32(pb);
1219 flags = avio_rl32(pb);
1220 pos = avio_rl32(pb);
1221 len = avio_rl32(pb);
1222 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1223 i, tag, flags, pos, len);
1225 index = ((tag & 0xff) - '0') * 10;
1226 index += ((tag >> 8) & 0xff) - '0';
1227 if (index >= s->nb_streams)
1229 st = s->streams[index];
1230 ast = st->priv_data;
1232 if(first_packet && first_packet_pos && len) {
1233 data_offset = first_packet_pos - pos;
1238 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1244 avi->non_interleaved= 1;
1245 else if(len || !ast->sample_size)
1246 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1247 ast->cum_len += get_duration(ast, len);
1253 static int guess_ni_flag(AVFormatContext *s){
1255 int64_t last_start=0;
1256 int64_t first_end= INT64_MAX;
1257 int64_t oldpos= avio_tell(s->pb);
1259 for(i=0; i<s->nb_streams; i++){
1260 AVStream *st = s->streams[i];
1261 int n= st->nb_index_entries;
1268 int64_t pos= st->index_entries[0].pos;
1269 avio_seek(s->pb, pos + 4, SEEK_SET);
1270 size= avio_rl32(s->pb);
1271 if(pos + size > st->index_entries[1].pos)
1272 last_start= INT64_MAX;
1275 if(st->index_entries[0].pos > last_start)
1276 last_start= st->index_entries[0].pos;
1277 if(st->index_entries[n-1].pos < first_end)
1278 first_end= st->index_entries[n-1].pos;
1280 avio_seek(s->pb, oldpos, SEEK_SET);
1281 return last_start > first_end;
1284 static int avi_load_index(AVFormatContext *s)
1286 AVIContext *avi = s->priv_data;
1287 AVIOContext *pb = s->pb;
1289 int64_t pos= avio_tell(pb);
1292 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1293 goto the_end; // maybe truncated file
1294 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1298 tag = avio_rl32(pb);
1299 size = avio_rl32(pb);
1300 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1307 if (tag == MKTAG('i', 'd', 'x', '1') &&
1308 avi_read_idx1(s, size) >= 0) {
1314 if (avio_skip(pb, size) < 0)
1315 break; // something is wrong here
1318 avio_seek(pb, pos, SEEK_SET);
1322 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1324 AVIStream *ast2 = st2->priv_data;
1325 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1326 av_free_packet(&ast2->sub_pkt);
1327 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1328 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1329 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1332 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1334 AVIContext *avi = s->priv_data;
1337 int64_t pos, pos_min;
1340 if (!avi->index_loaded) {
1341 /* we only load the index on demand */
1343 avi->index_loaded = 1;
1345 assert(stream_index>= 0);
1347 st = s->streams[stream_index];
1349 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1353 /* find the position */
1354 pos = st->index_entries[index].pos;
1355 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1357 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1359 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1360 /* One and only one real stream for DV in AVI, and it has video */
1361 /* offsets. Calling with other stream indexes should have failed */
1362 /* the av_index_search_timestamp call above. */
1363 assert(stream_index == 0);
1365 /* Feed the DV video stream version of the timestamp to the */
1366 /* DV demux so it can synthesize correct timestamps. */
1367 dv_offset_reset(avi->dv_demux, timestamp);
1369 avio_seek(s->pb, pos, SEEK_SET);
1370 avi->stream_index= -1;
1375 for(i = 0; i < s->nb_streams; i++) {
1376 AVStream *st2 = s->streams[i];
1377 AVIStream *ast2 = st2->priv_data;
1382 if (ast2->sub_ctx) {
1383 seek_subtitle(st, st2, timestamp);
1387 if (st2->nb_index_entries <= 0)
1390 // assert(st2->codec->block_align);
1391 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1392 index = av_index_search_timestamp(
1394 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1395 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1398 ast2->seek_pos= st2->index_entries[index].pos;
1399 pos_min= FFMIN(pos_min,ast2->seek_pos);
1401 for(i = 0; i < s->nb_streams; i++) {
1402 AVStream *st2 = s->streams[i];
1403 AVIStream *ast2 = st2->priv_data;
1405 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1408 index = av_index_search_timestamp(
1410 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1411 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1414 while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1416 ast2->frame_offset = st2->index_entries[index].timestamp;
1420 avio_seek(s->pb, pos_min, SEEK_SET);
1421 avi->stream_index= -1;
1422 avi->dts_max= INT_MIN;
1426 static int avi_read_close(AVFormatContext *s)
1429 AVIContext *avi = s->priv_data;
1431 for(i=0;i<s->nb_streams;i++) {
1432 AVStream *st = s->streams[i];
1433 AVIStream *ast = st->priv_data;
1436 av_freep(&ast->sub_ctx->pb);
1437 av_close_input_file(ast->sub_ctx);
1439 av_free(ast->sub_buffer);
1440 av_free_packet(&ast->sub_pkt);
1444 av_free(avi->dv_demux);
1449 static int avi_probe(AVProbeData *p)
1453 /* check file header */
1454 for(i=0; avi_headers[i][0]; i++)
1455 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1456 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1457 return AVPROBE_SCORE_MAX;
1462 AVInputFormat ff_avi_demuxer = {
1464 .long_name = NULL_IF_CONFIG_SMALL("AVI format"),
1465 .priv_data_size = sizeof(AVIContext),
1466 .read_probe = avi_probe,
1467 .read_header = avi_read_header,
1468 .read_packet = avi_read_packet,
1469 .read_close = avi_read_close,
1470 .read_seek = avi_read_seek,
1471 .priv_class = &demuxer_class,