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
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mathematics.h"
25 #include "libavutil/bswap.h"
26 #include "libavutil/dict.h"
35 typedef struct AVIStream {
36 int64_t frame_offset; /* current frame (video) or byte (audio) counter
37 (used to compute the pts) */
43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45 int64_t cum_len; /* temporary storage (used during seek) */
47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
51 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
53 AVFormatContext *sub_ctx;
68 DVDemuxContext* dv_demux;
70 #define MAX_ODML_DEPTH 1000
73 static const char avi_headers[][8] = {
74 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
75 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
76 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
77 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
78 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
82 static int avi_load_index(AVFormatContext *s);
83 static int guess_ni_flag(AVFormatContext *s);
85 #define print_tag(str, tag, size) \
86 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
93 static inline int get_duration(AVIStream *ast, int len){
96 }else if (ast->dshow_block_align){
97 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
102 static int get_riff(AVFormatContext *s, AVIOContext *pb)
104 AVIContext *avi = s->priv_data;
108 /* check RIFF header */
109 avio_read(pb, header, 4);
110 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
111 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
112 avio_read(pb, header+4, 4);
114 for(i=0; avi_headers[i][0]; i++)
115 if(!memcmp(header, avi_headers[i], 8))
117 if(!avi_headers[i][0])
120 if(header[7] == 0x19)
121 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
126 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
127 AVIContext *avi = s->priv_data;
128 AVIOContext *pb = s->pb;
129 int longs_pre_entry= avio_rl16(pb);
130 int index_sub_type = avio_r8(pb);
131 int index_type = avio_r8(pb);
132 int entries_in_use = avio_rl32(pb);
133 int chunk_id = avio_rl32(pb);
134 int64_t base = avio_rl64(pb);
135 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
139 int64_t last_pos= -1;
140 int64_t filesize= avio_size(s->pb);
142 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
143 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
145 if(stream_id >= s->nb_streams || stream_id < 0)
147 st= s->streams[stream_id];
155 if(index_type && longs_pre_entry != 2)
160 if(filesize > 0 && base >= filesize){
161 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
162 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
168 for(i=0; i<entries_in_use; i++){
170 int64_t pos= avio_rl32(pb) + base - 8;
171 int len = avio_rl32(pb);
175 av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len);
180 if(last_pos == pos || pos == base - 8)
181 avi->non_interleaved= 1;
182 if(last_pos != pos && (len || !ast->sample_size))
183 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
185 ast->cum_len += get_duration(ast, len);
190 offset = avio_rl64(pb);
191 avio_rl32(pb); /* size */
192 duration = avio_rl32(pb);
199 if(avi->odml_depth > MAX_ODML_DEPTH){
200 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
204 avio_seek(pb, offset+8, SEEK_SET);
206 read_braindead_odml_indx(s, frame_num);
208 frame_num += duration;
210 avio_seek(pb, pos, SEEK_SET);
217 static void clean_index(AVFormatContext *s){
221 for(i=0; i<s->nb_streams; i++){
222 AVStream *st = s->streams[i];
223 AVIStream *ast = st->priv_data;
224 int n= st->nb_index_entries;
225 int max= ast->sample_size;
226 int64_t pos, size, ts;
228 if(n != 1 || ast->sample_size==0)
231 while(max < 1024) max+=max;
233 pos= st->index_entries[0].pos;
234 size= st->index_entries[0].size;
235 ts= st->index_entries[0].timestamp;
237 for(j=0; j<size; j+=max){
238 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
243 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
245 AVIOContext *pb = s->pb;
246 char key[5] = {0}, *value;
250 if (size == UINT_MAX)
252 value = av_malloc(size+1);
255 avio_read(pb, value, size);
260 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
261 AV_DICT_DONT_STRDUP_VAL);
264 static void avi_read_info(AVFormatContext *s, uint64_t end)
266 while (avio_tell(s->pb) < end) {
267 uint32_t tag = avio_rl32(s->pb);
268 uint32_t size = avio_rl32(s->pb);
269 avi_read_tag(s, NULL, tag, size);
273 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
274 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
276 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
278 char month[4], time[9], buffer[64];
280 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
281 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
282 month, &day, time, &year) == 4) {
284 if (!strcasecmp(month, months[i])) {
285 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
286 year, i+1, day, time);
287 av_dict_set(metadata, "creation_time", buffer, 0);
289 } else if (date[4] == '/' && date[7] == '/') {
290 date[4] = date[7] = '-';
291 av_dict_set(metadata, "creation_time", date, 0);
295 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
297 while (avio_tell(s->pb) < end) {
298 uint32_t tag = avio_rl32(s->pb);
299 uint32_t size = avio_rl32(s->pb);
301 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
302 uint64_t tag_end = avio_tell(s->pb) + size;
303 while (avio_tell(s->pb) < tag_end) {
304 uint16_t tag = avio_rl16(s->pb);
305 uint16_t size = avio_rl16(s->pb);
306 const char *name = NULL;
307 char buffer[64] = {0};
308 size -= avio_read(s->pb, buffer,
309 FFMIN(size, sizeof(buffer)-1));
311 case 0x03: name = "maker"; break;
312 case 0x04: name = "model"; break;
313 case 0x13: name = "creation_time";
314 if (buffer[4] == ':' && buffer[7] == ':')
315 buffer[4] = buffer[7] = '-';
319 av_dict_set(&s->metadata, name, buffer, 0);
320 avio_skip(s->pb, size);
325 avio_skip(s->pb, size);
331 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
333 AVIContext *avi = s->priv_data;
334 AVIOContext *pb = s->pb;
335 unsigned int tag, tag1, handler;
336 int codec_type, stream_index, frame_period;
340 AVIStream *ast = NULL;
341 int avih_width=0, avih_height=0;
342 int amv_file_format=0;
343 uint64_t list_end = 0;
346 avi->stream_index= -1;
348 if (get_riff(s, pb) < 0)
351 avi->fsize = avio_size(pb);
353 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
363 size = avio_rl32(pb);
365 print_tag("tag", tag, size);
368 case MKTAG('L', 'I', 'S', 'T'):
369 list_end = avio_tell(pb) + size;
370 /* Ignored, except at start of video packets. */
371 tag1 = avio_rl32(pb);
373 print_tag("list", tag1, 0);
375 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
376 avi->movi_list = avio_tell(pb) - 4;
377 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
378 else avi->movi_end = avio_size(pb);
379 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
382 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
383 avi_read_info(s, list_end);
384 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
385 avi_read_nikon(s, list_end);
388 case MKTAG('I', 'D', 'I', 'T'): {
389 unsigned char date[64] = {0};
391 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
393 avi_metadata_creation_time(&s->metadata, date);
396 case MKTAG('d', 'm', 'l', 'h'):
398 avio_skip(pb, size + (size & 1));
400 case MKTAG('a', 'm', 'v', 'h'):
402 case MKTAG('a', 'v', 'i', 'h'):
404 /* using frame_period is bad idea */
405 frame_period = avio_rl32(pb);
408 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
410 avio_skip(pb, 2 * 4);
413 avih_width=avio_rl32(pb);
414 avih_height=avio_rl32(pb);
416 avio_skip(pb, size - 10 * 4);
418 case MKTAG('s', 't', 'r', 'h'):
421 tag1 = avio_rl32(pb);
422 handler = avio_rl32(pb); /* codec tag */
424 if(tag1 == MKTAG('p', 'a', 'd', 's')){
425 avio_skip(pb, size - 8);
429 st = av_new_stream(s, stream_index);
433 ast = av_mallocz(sizeof(AVIStream));
439 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
441 print_tag("strh", tag1, -1);
443 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
447 * After some consideration -- I don't think we
448 * have to support anything but DV in type1 AVIs.
450 if (s->nb_streams != 1)
453 if (handler != MKTAG('d', 'v', 's', 'd') &&
454 handler != MKTAG('d', 'v', 'h', 'd') &&
455 handler != MKTAG('d', 'v', 's', 'l'))
458 ast = s->streams[0]->priv_data;
459 av_freep(&s->streams[0]->codec->extradata);
460 av_freep(&s->streams[0]->codec);
461 av_freep(&s->streams[0]);
463 if (CONFIG_DV_DEMUXER) {
464 avi->dv_demux = dv_init_demux(s);
468 s->streams[0]->priv_data = ast;
469 avio_skip(pb, 3 * 4);
470 ast->scale = avio_rl32(pb);
471 ast->rate = avio_rl32(pb);
472 avio_skip(pb, 4); /* start time */
474 dv_dur = avio_rl32(pb);
475 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
476 dv_dur *= AV_TIME_BASE;
477 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
480 * else, leave duration alone; timing estimation in utils.c
481 * will make a guess based on bitrate.
484 stream_index = s->nb_streams - 1;
485 avio_skip(pb, size - 9*4);
489 assert(stream_index < s->nb_streams);
490 st->codec->stream_codec_tag= handler;
492 avio_rl32(pb); /* flags */
493 avio_rl16(pb); /* priority */
494 avio_rl16(pb); /* language */
495 avio_rl32(pb); /* initial frame */
496 ast->scale = avio_rl32(pb);
497 ast->rate = avio_rl32(pb);
498 if(!(ast->scale && ast->rate)){
499 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);
502 ast->scale = frame_period;
508 av_set_pts_info(st, 64, ast->scale, ast->rate);
510 ast->cum_len=avio_rl32(pb); /* start */
511 st->nb_frames = avio_rl32(pb);
514 avio_rl32(pb); /* buffer size */
515 avio_rl32(pb); /* quality */
516 ast->sample_size = avio_rl32(pb); /* sample ssize */
517 ast->cum_len *= FFMAX(1, ast->sample_size);
518 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
521 case MKTAG('v', 'i', 'd', 's'):
522 codec_type = AVMEDIA_TYPE_VIDEO;
524 ast->sample_size = 0;
526 case MKTAG('a', 'u', 'd', 's'):
527 codec_type = AVMEDIA_TYPE_AUDIO;
529 case MKTAG('t', 'x', 't', 's'):
530 codec_type = AVMEDIA_TYPE_SUBTITLE;
532 case MKTAG('d', 'a', 't', 's'):
533 codec_type = AVMEDIA_TYPE_DATA;
536 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
539 if(ast->sample_size == 0)
540 st->duration = st->nb_frames;
541 ast->frame_offset= ast->cum_len;
542 avio_skip(pb, size - 12 * 4);
544 case MKTAG('s', 't', 'r', 'f'):
546 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
549 uint64_t cur_pos = avio_tell(pb);
550 if (cur_pos < list_end)
551 size = FFMIN(size, list_end - cur_pos);
552 st = s->streams[stream_index];
554 case AVMEDIA_TYPE_VIDEO:
556 st->codec->width=avih_width;
557 st->codec->height=avih_height;
558 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
559 st->codec->codec_id = CODEC_ID_AMV;
563 tag1 = ff_get_bmp_header(pb, st);
565 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
566 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
567 st->codec->codec_tag = tag1;
568 st->codec->codec_id = CODEC_ID_XSUB;
572 if(size > 10*4 && size<(1<<30)){
573 st->codec->extradata_size= size - 10*4;
574 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
575 if (!st->codec->extradata) {
576 st->codec->extradata_size= 0;
577 return AVERROR(ENOMEM);
579 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
582 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
585 /* Extract palette from extradata if bpp <= 8. */
586 /* This code assumes that extradata contains only palette. */
587 /* This is true for all paletted codecs implemented in Libav. */
588 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
589 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
590 const uint8_t *pal_src;
592 pal_size = FFMIN(pal_size, st->codec->extradata_size);
593 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
595 for (i = 0; i < pal_size/4; i++)
596 ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]);
598 memcpy(ast->pal, pal_src, pal_size);
603 print_tag("video", tag1, 0);
605 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
606 st->codec->codec_tag = tag1;
607 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
608 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
609 // Support "Resolution 1:1" for Avid AVI Codec
610 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
611 st->codec->extradata_size >= 31 &&
612 !memcmp(&st->codec->extradata[28], "1:1", 3))
613 st->codec->codec_id = CODEC_ID_RAWVIDEO;
615 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
616 st->codec->extradata_size+= 9;
617 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
618 if(st->codec->extradata)
619 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
621 st->codec->height= FFABS(st->codec->height);
623 // avio_skip(pb, size - 5 * 4);
625 case AVMEDIA_TYPE_AUDIO:
626 ret = ff_get_wav_header(pb, st->codec, size);
629 ast->dshow_block_align= st->codec->block_align;
630 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
631 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
632 ast->sample_size= st->codec->block_align;
634 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
636 /* Force parsing as several audio frames can be in
637 * one packet and timestamps refer to packet start. */
638 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
639 /* ADTS header is in extradata, AAC without header must be
640 * stored as exact frames. Parser not needed and it will
642 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
643 st->need_parsing = AVSTREAM_PARSE_NONE;
644 /* AVI files with Xan DPCM audio (wrongly) declare PCM
645 * audio in the header but have Axan as stream_code_tag. */
646 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
647 st->codec->codec_id = CODEC_ID_XAN_DPCM;
648 st->codec->codec_tag = 0;
650 if (amv_file_format){
651 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
652 ast->dshow_block_align = 0;
655 case AVMEDIA_TYPE_SUBTITLE:
656 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
657 st->codec->codec_id = CODEC_ID_PROBE;
660 st->codec->codec_type = AVMEDIA_TYPE_DATA;
661 st->codec->codec_id= CODEC_ID_NONE;
662 st->codec->codec_tag= 0;
668 case MKTAG('i', 'n', 'd', 'x'):
670 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
671 read_braindead_odml_indx(s, 0) < 0 && s->error_recognition >= FF_ER_EXPLODE){
674 avio_seek(pb, i+size, SEEK_SET);
676 case MKTAG('v', 'p', 'r', 'p'):
677 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
678 AVRational active, active_aspect;
680 st = s->streams[stream_index];
687 active_aspect.den= avio_rl16(pb);
688 active_aspect.num= avio_rl16(pb);
689 active.num = avio_rl32(pb);
690 active.den = avio_rl32(pb);
691 avio_rl32(pb); //nbFieldsPerFrame
693 if(active_aspect.num && active_aspect.den && active.num && active.den){
694 st->sample_aspect_ratio= av_div_q(active_aspect, active);
695 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
701 case MKTAG('s', 't', 'r', 'n'):
703 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
708 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
709 "I will ignore it and try to continue anyway.\n");
710 if (s->error_recognition >= FF_ER_EXPLODE) goto fail;
711 avi->movi_list = avio_tell(pb) - 4;
712 avi->movi_end = avio_size(pb);
722 /* check stream number */
723 if (stream_index != s->nb_streams - 1) {
728 if(!avi->index_loaded && pb->seekable)
730 avi->index_loaded = 1;
731 avi->non_interleaved |= guess_ni_flag(s);
732 for(i=0; i<s->nb_streams; i++){
733 AVStream *st = s->streams[i];
734 if(st->nb_index_entries)
737 if(i==s->nb_streams && avi->non_interleaved) {
738 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
739 avi->non_interleaved=0;
742 if(avi->non_interleaved) {
743 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
747 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_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 av_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 av_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 (av_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;
851 memset(d, -1, sizeof(int)*8);
852 for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
859 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
861 n= get_stream_idx(d+2);
862 //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);
863 if(i + (uint64_t)size > avi->fsize || d[0]<0)
867 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
869 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
870 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
872 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
877 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
882 n= get_stream_idx(d);
884 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
887 //detect ##ix chunk and skip
888 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
894 if(n < s->nb_streams){
900 if(s->nb_streams>=2){
901 AVStream *st1 = s->streams[1];
902 AVIStream *ast1= st1->priv_data;
903 //workaround for broken small-file-bug402.avi
904 if( d[2] == 'w' && d[3] == 'b'
906 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
907 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
908 && ast->prefix == 'd'*256+'c'
909 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
914 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
919 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
920 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
921 || st->discard >= AVDISCARD_ALL){
923 ast->frame_offset += get_duration(ast, size);
929 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
931 int last = (k + avio_r8(pb) - 1) & 0xFF;
933 avio_rl16(pb); //flags
935 for (; k <= last; k++)
936 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
939 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
940 d[2]*256+d[3] == ast->prefix /*||
941 (d[2] == 'd' && d[3] == 'c') ||
942 (d[2] == 'w' && d[3] == 'b')*/) {
946 //av_log(s, AV_LOG_DEBUG, "OK\n");
947 if(d[2]*256+d[3] == ast->prefix)
950 ast->prefix= d[2]*256+d[3];
951 ast->prefix_count= 0;
954 avi->stream_index= n;
955 ast->packet_size= size + 8;
956 ast->remaining= size;
958 if(size || !ast->sample_size){
959 uint64_t pos= avio_tell(pb) - 8;
960 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
961 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
972 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
974 AVIContext *avi = s->priv_data;
975 AVIOContext *pb = s->pb;
979 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
980 int size = dv_get_packet(avi->dv_demux, pkt);
985 if(avi->non_interleaved){
986 int best_stream_index = 0;
987 AVStream *best_st= NULL;
989 int64_t best_ts= INT64_MAX;
992 for(i=0; i<s->nb_streams; i++){
993 AVStream *st = s->streams[i];
994 AVIStream *ast = st->priv_data;
995 int64_t ts= ast->frame_offset;
998 if(!st->nb_index_entries)
1001 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1002 if(!ast->remaining && ts > last_ts)
1005 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
1007 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
1011 best_stream_index= i;
1017 best_ast = best_st->priv_data;
1018 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
1019 if(best_ast->remaining)
1020 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
1022 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1024 best_ast->frame_offset= best_st->index_entries[i].timestamp;
1027 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
1029 int64_t pos= best_st->index_entries[i].pos;
1030 pos += best_ast->packet_size - best_ast->remaining;
1031 avio_seek(s->pb, pos + 8, SEEK_SET);
1032 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
1034 assert(best_ast->remaining <= best_ast->packet_size);
1036 avi->stream_index= best_stream_index;
1037 if(!best_ast->remaining)
1038 best_ast->packet_size=
1039 best_ast->remaining= best_st->index_entries[i].size;
1044 if(avi->stream_index >= 0){
1045 AVStream *st= s->streams[ avi->stream_index ];
1046 AVIStream *ast= st->priv_data;
1049 if(get_subtitle_pkt(s, st, pkt))
1052 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1054 else if(ast->sample_size < 32)
1055 // arbitrary multiplier to avoid tiny packets for raw PCM data
1056 size= 1024*ast->sample_size;
1058 size= ast->sample_size;
1060 if(size > ast->remaining)
1061 size= ast->remaining;
1062 avi->last_pkt_pos= avio_tell(pb);
1063 err= av_get_packet(pb, pkt, size);
1067 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
1069 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
1071 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
1073 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1078 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1079 dstr = pkt->destruct;
1080 size = dv_produce_packet(avi->dv_demux, pkt,
1081 pkt->data, pkt->size);
1082 pkt->destruct = dstr;
1083 pkt->flags |= AV_PKT_FLAG_KEY;
1085 av_free_packet(pkt);
1086 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
1087 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1088 ast->frame_offset++;
1089 avi->stream_index = -1;
1093 /* XXX: How to handle B-frames in AVI? */
1094 pkt->dts = ast->frame_offset;
1095 // pkt->dts += ast->start;
1096 if(ast->sample_size)
1097 pkt->dts /= ast->sample_size;
1098 //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);
1099 pkt->stream_index = avi->stream_index;
1101 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1104 assert(st->index_entries);
1106 index= av_index_search_timestamp(st, ast->frame_offset, 0);
1107 e= &st->index_entries[index];
1109 if(index >= 0 && e->timestamp == ast->frame_offset){
1110 if (e->flags & AVINDEX_KEYFRAME)
1111 pkt->flags |= AV_PKT_FLAG_KEY;
1114 pkt->flags |= AV_PKT_FLAG_KEY;
1116 ast->frame_offset += get_duration(ast, pkt->size);
1118 ast->remaining -= size;
1119 if(!ast->remaining){
1120 avi->stream_index= -1;
1121 ast->packet_size= 0;
1127 if ((err = avi_sync(s, 0)) < 0)
1132 /* XXX: We make the implicit supposition that the positions are sorted
1134 static int avi_read_idx1(AVFormatContext *s, int size)
1136 AVIContext *avi = s->priv_data;
1137 AVIOContext *pb = s->pb;
1138 int nb_index_entries, i;
1141 unsigned int index, tag, flags, pos, len, first_packet = 1;
1142 unsigned last_pos= -1;
1143 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1145 nb_index_entries = size / 16;
1146 if (nb_index_entries <= 0)
1149 idx1_pos = avio_tell(pb);
1150 avio_seek(pb, avi->movi_list+4, SEEK_SET);
1151 if (avi_sync(s, 1) == 0) {
1152 first_packet_pos = avio_tell(pb) - 8;
1154 avi->stream_index = -1;
1155 avio_seek(pb, idx1_pos, SEEK_SET);
1157 /* Read the entries and sort them in each stream component. */
1158 for(i = 0; i < nb_index_entries; i++) {
1159 tag = avio_rl32(pb);
1160 flags = avio_rl32(pb);
1161 pos = avio_rl32(pb);
1162 len = avio_rl32(pb);
1163 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1164 i, tag, flags, pos, len);
1166 index = ((tag & 0xff) - '0') * 10;
1167 index += ((tag >> 8) & 0xff) - '0';
1168 if (index >= s->nb_streams)
1170 st = s->streams[index];
1171 ast = st->priv_data;
1173 if(first_packet && first_packet_pos && len) {
1174 data_offset = first_packet_pos - pos;
1179 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1185 avi->non_interleaved= 1;
1186 else if(len || !ast->sample_size)
1187 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1188 ast->cum_len += get_duration(ast, len);
1194 static int guess_ni_flag(AVFormatContext *s){
1196 int64_t last_start=0;
1197 int64_t first_end= INT64_MAX;
1198 int64_t oldpos= avio_tell(s->pb);
1200 for(i=0; i<s->nb_streams; i++){
1201 AVStream *st = s->streams[i];
1202 int n= st->nb_index_entries;
1209 int64_t pos= st->index_entries[0].pos;
1210 avio_seek(s->pb, pos + 4, SEEK_SET);
1211 size= avio_rl32(s->pb);
1212 if(pos + size > st->index_entries[1].pos)
1213 last_start= INT64_MAX;
1216 if(st->index_entries[0].pos > last_start)
1217 last_start= st->index_entries[0].pos;
1218 if(st->index_entries[n-1].pos < first_end)
1219 first_end= st->index_entries[n-1].pos;
1221 avio_seek(s->pb, oldpos, SEEK_SET);
1222 return last_start > first_end;
1225 static int avi_load_index(AVFormatContext *s)
1227 AVIContext *avi = s->priv_data;
1228 AVIOContext *pb = s->pb;
1230 int64_t pos= avio_tell(pb);
1233 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1234 goto the_end; // maybe truncated file
1235 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1237 if (pb->eof_reached)
1239 tag = avio_rl32(pb);
1240 size = avio_rl32(pb);
1241 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1248 if (tag == MKTAG('i', 'd', 'x', '1') &&
1249 avi_read_idx1(s, size) >= 0) {
1255 if (avio_skip(pb, size) < 0)
1256 break; // something is wrong here
1259 avio_seek(pb, pos, SEEK_SET);
1263 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1265 AVIStream *ast2 = st2->priv_data;
1266 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1267 av_free_packet(&ast2->sub_pkt);
1268 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1269 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1270 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1273 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1275 AVIContext *avi = s->priv_data;
1281 if (!avi->index_loaded) {
1282 /* we only load the index on demand */
1284 avi->index_loaded = 1;
1286 assert(stream_index>= 0);
1288 st = s->streams[stream_index];
1290 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1294 /* find the position */
1295 pos = st->index_entries[index].pos;
1296 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1298 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1300 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1301 /* One and only one real stream for DV in AVI, and it has video */
1302 /* offsets. Calling with other stream indexes should have failed */
1303 /* the av_index_search_timestamp call above. */
1304 assert(stream_index == 0);
1306 /* Feed the DV video stream version of the timestamp to the */
1307 /* DV demux so it can synthesize correct timestamps. */
1308 dv_offset_reset(avi->dv_demux, timestamp);
1310 avio_seek(s->pb, pos, SEEK_SET);
1311 avi->stream_index= -1;
1315 for(i = 0; i < s->nb_streams; i++) {
1316 AVStream *st2 = s->streams[i];
1317 AVIStream *ast2 = st2->priv_data;
1322 if (ast2->sub_ctx) {
1323 seek_subtitle(st, st2, timestamp);
1327 if (st2->nb_index_entries <= 0)
1330 // assert(st2->codec->block_align);
1331 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1332 index = av_index_search_timestamp(
1334 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1335 flags | AVSEEK_FLAG_BACKWARD);
1339 if(!avi->non_interleaved){
1340 while(index>0 && st2->index_entries[index].pos > pos)
1342 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1346 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1347 /* extract the current frame number */
1348 ast2->frame_offset = st2->index_entries[index].timestamp;
1352 avio_seek(s->pb, pos, SEEK_SET);
1353 avi->stream_index= -1;
1357 static int avi_read_close(AVFormatContext *s)
1360 AVIContext *avi = s->priv_data;
1362 for(i=0;i<s->nb_streams;i++) {
1363 AVStream *st = s->streams[i];
1364 AVIStream *ast = st->priv_data;
1367 av_freep(&ast->sub_ctx->pb);
1368 av_close_input_file(ast->sub_ctx);
1370 av_free(ast->sub_buffer);
1371 av_free_packet(&ast->sub_pkt);
1375 av_free(avi->dv_demux);
1380 static int avi_probe(AVProbeData *p)
1384 /* check file header */
1385 for(i=0; avi_headers[i][0]; i++)
1386 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1387 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1388 return AVPROBE_SCORE_MAX;
1393 AVInputFormat ff_avi_demuxer = {
1395 .long_name = NULL_IF_CONFIG_SMALL("AVI format"),
1396 .priv_data_size = sizeof(AVIContext),
1397 .read_probe = avi_probe,
1398 .read_header = avi_read_header,
1399 .read_packet = avi_read_packet,
1400 .read_close = avi_read_close,
1401 .read_seek = avi_read_seek,