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
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/dict.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;
70 DVDemuxContext* dv_demux;
72 #define MAX_ODML_DEPTH 1000
75 static const char avi_headers[][8] = {
76 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
77 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
78 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
79 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
80 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
84 static int avi_load_index(AVFormatContext *s);
85 static int guess_ni_flag(AVFormatContext *s);
87 #define print_tag(str, tag, size) \
88 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
95 static inline int get_duration(AVIStream *ast, int len){
98 }else if (ast->dshow_block_align){
99 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
104 static int get_riff(AVFormatContext *s, AVIOContext *pb)
106 AVIContext *avi = s->priv_data;
110 /* check RIFF header */
111 avio_read(pb, header, 4);
112 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
113 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
114 avio_read(pb, header+4, 4);
116 for(i=0; avi_headers[i][0]; i++)
117 if(!memcmp(header, avi_headers[i], 8))
119 if(!avi_headers[i][0])
122 if(header[7] == 0x19)
123 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
128 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
129 AVIContext *avi = s->priv_data;
130 AVIOContext *pb = s->pb;
131 int longs_pre_entry= avio_rl16(pb);
132 int index_sub_type = avio_r8(pb);
133 int index_type = avio_r8(pb);
134 int entries_in_use = avio_rl32(pb);
135 int chunk_id = avio_rl32(pb);
136 int64_t base = avio_rl64(pb);
137 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
141 int64_t last_pos= -1;
142 int64_t filesize= avio_size(s->pb);
145 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
146 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
149 if(stream_id >= s->nb_streams || stream_id < 0)
151 st= s->streams[stream_id];
159 if(index_type && longs_pre_entry != 2)
164 if(filesize > 0 && base >= filesize){
165 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
166 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
172 for(i=0; i<entries_in_use; i++){
174 int64_t pos= avio_rl32(pb) + base - 8;
175 int len = avio_rl32(pb);
180 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
185 if(last_pos == pos || pos == base - 8)
186 avi->non_interleaved= 1;
187 if(last_pos != pos && (len || !ast->sample_size))
188 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
190 ast->cum_len += get_duration(ast, len);
195 offset = avio_rl64(pb);
196 avio_rl32(pb); /* size */
197 duration = avio_rl32(pb);
204 if(avi->odml_depth > MAX_ODML_DEPTH){
205 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
209 avio_seek(pb, offset+8, SEEK_SET);
211 read_braindead_odml_indx(s, frame_num);
213 frame_num += duration;
215 avio_seek(pb, pos, SEEK_SET);
222 static void clean_index(AVFormatContext *s){
226 for(i=0; i<s->nb_streams; i++){
227 AVStream *st = s->streams[i];
228 AVIStream *ast = st->priv_data;
229 int n= st->nb_index_entries;
230 int max= ast->sample_size;
231 int64_t pos, size, ts;
233 if(n != 1 || ast->sample_size==0)
236 while(max < 1024) max+=max;
238 pos= st->index_entries[0].pos;
239 size= st->index_entries[0].size;
240 ts= st->index_entries[0].timestamp;
242 for(j=0; j<size; j+=max){
243 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
248 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
250 AVIOContext *pb = s->pb;
251 char key[5] = {0}, *value;
255 if (size == UINT_MAX)
257 value = av_malloc(size+1);
260 avio_read(pb, value, size);
265 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
266 AV_DICT_DONT_STRDUP_VAL);
269 static void avi_read_info(AVFormatContext *s, uint64_t end)
271 while (avio_tell(s->pb) < end) {
272 uint32_t tag = avio_rl32(s->pb);
273 uint32_t size = avio_rl32(s->pb);
274 avi_read_tag(s, NULL, tag, size);
278 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
279 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
281 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
283 char month[4], time[9], buffer[64];
285 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
286 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
287 month, &day, time, &year) == 4) {
289 if (!strcasecmp(month, months[i])) {
290 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
291 year, i+1, day, time);
292 av_dict_set(metadata, "creation_time", buffer, 0);
294 } else if (date[4] == '/' && date[7] == '/') {
295 date[4] = date[7] = '-';
296 av_dict_set(metadata, "creation_time", date, 0);
300 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
302 while (avio_tell(s->pb) < end) {
303 uint32_t tag = avio_rl32(s->pb);
304 uint32_t size = avio_rl32(s->pb);
306 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
307 uint64_t tag_end = avio_tell(s->pb) + size;
308 while (avio_tell(s->pb) < tag_end) {
309 uint16_t tag = avio_rl16(s->pb);
310 uint16_t size = avio_rl16(s->pb);
311 const char *name = NULL;
312 char buffer[64] = {0};
313 size -= avio_read(s->pb, buffer,
314 FFMIN(size, sizeof(buffer)-1));
316 case 0x03: name = "maker"; break;
317 case 0x04: name = "model"; break;
318 case 0x13: name = "creation_time";
319 if (buffer[4] == ':' && buffer[7] == ':')
320 buffer[4] = buffer[7] = '-';
324 av_dict_set(&s->metadata, name, buffer, 0);
325 avio_skip(s->pb, size);
330 avio_skip(s->pb, size);
336 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
338 AVIContext *avi = s->priv_data;
339 AVIOContext *pb = s->pb;
340 unsigned int tag, tag1, handler;
341 int codec_type, stream_index, frame_period;
345 AVIStream *ast = NULL;
346 int avih_width=0, avih_height=0;
347 int amv_file_format=0;
348 uint64_t list_end = 0;
351 avi->stream_index= -1;
353 if (get_riff(s, pb) < 0)
356 avi->fsize = avio_size(pb);
358 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
368 size = avio_rl32(pb);
370 print_tag("tag", tag, size);
373 case MKTAG('L', 'I', 'S', 'T'):
374 list_end = avio_tell(pb) + size;
375 /* Ignored, except at start of video packets. */
376 tag1 = avio_rl32(pb);
378 print_tag("list", tag1, 0);
380 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
381 avi->movi_list = avio_tell(pb) - 4;
382 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
383 else avi->movi_end = avio_size(pb);
384 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
387 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
388 avi_read_info(s, list_end);
389 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
390 avi_read_nikon(s, list_end);
393 case MKTAG('I', 'D', 'I', 'T'): {
394 unsigned char date[64] = {0};
396 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
398 avi_metadata_creation_time(&s->metadata, date);
401 case MKTAG('d', 'm', 'l', 'h'):
403 avio_skip(pb, size + (size & 1));
405 case MKTAG('a', 'm', 'v', 'h'):
407 case MKTAG('a', 'v', 'i', 'h'):
409 /* using frame_period is bad idea */
410 frame_period = avio_rl32(pb);
413 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
415 avio_skip(pb, 2 * 4);
418 avih_width=avio_rl32(pb);
419 avih_height=avio_rl32(pb);
421 avio_skip(pb, size - 10 * 4);
423 case MKTAG('s', 't', 'r', 'h'):
426 tag1 = avio_rl32(pb);
427 handler = avio_rl32(pb); /* codec tag */
429 if(tag1 == MKTAG('p', 'a', 'd', 's')){
430 avio_skip(pb, size - 8);
434 st = av_new_stream(s, stream_index);
438 ast = av_mallocz(sizeof(AVIStream));
444 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
446 print_tag("strh", tag1, -1);
448 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
452 * After some consideration -- I don't think we
453 * have to support anything but DV in type1 AVIs.
455 if (s->nb_streams != 1)
458 if (handler != MKTAG('d', 'v', 's', 'd') &&
459 handler != MKTAG('d', 'v', 'h', 'd') &&
460 handler != MKTAG('d', 'v', 's', 'l'))
463 ast = s->streams[0]->priv_data;
464 av_freep(&s->streams[0]->codec->extradata);
465 av_freep(&s->streams[0]->codec);
466 av_freep(&s->streams[0]);
468 if (CONFIG_DV_DEMUXER) {
469 avi->dv_demux = dv_init_demux(s);
473 s->streams[0]->priv_data = ast;
474 avio_skip(pb, 3 * 4);
475 ast->scale = avio_rl32(pb);
476 ast->rate = avio_rl32(pb);
477 avio_skip(pb, 4); /* start time */
479 dv_dur = avio_rl32(pb);
480 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
481 dv_dur *= AV_TIME_BASE;
482 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
485 * else, leave duration alone; timing estimation in utils.c
486 * will make a guess based on bitrate.
489 stream_index = s->nb_streams - 1;
490 avio_skip(pb, size - 9*4);
494 assert(stream_index < s->nb_streams);
495 st->codec->stream_codec_tag= handler;
497 avio_rl32(pb); /* flags */
498 avio_rl16(pb); /* priority */
499 avio_rl16(pb); /* language */
500 avio_rl32(pb); /* initial frame */
501 ast->scale = avio_rl32(pb);
502 ast->rate = avio_rl32(pb);
503 if(!(ast->scale && ast->rate)){
504 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);
507 ast->scale = frame_period;
513 av_set_pts_info(st, 64, ast->scale, ast->rate);
515 ast->cum_len=avio_rl32(pb); /* start */
516 st->nb_frames = avio_rl32(pb);
519 avio_rl32(pb); /* buffer size */
520 avio_rl32(pb); /* quality */
521 ast->sample_size = avio_rl32(pb); /* sample ssize */
522 ast->cum_len *= FFMAX(1, ast->sample_size);
523 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
526 case MKTAG('v', 'i', 'd', 's'):
527 codec_type = AVMEDIA_TYPE_VIDEO;
529 ast->sample_size = 0;
531 case MKTAG('a', 'u', 'd', 's'):
532 codec_type = AVMEDIA_TYPE_AUDIO;
534 case MKTAG('t', 'x', 't', 's'):
535 codec_type = AVMEDIA_TYPE_SUBTITLE;
537 case MKTAG('d', 'a', 't', 's'):
538 codec_type = AVMEDIA_TYPE_DATA;
541 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
544 if(ast->sample_size == 0)
545 st->duration = st->nb_frames;
546 ast->frame_offset= ast->cum_len;
547 avio_skip(pb, size - 12 * 4);
549 case MKTAG('s', 't', 'r', 'f'):
551 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
554 uint64_t cur_pos = avio_tell(pb);
555 if (cur_pos < list_end)
556 size = FFMIN(size, list_end - cur_pos);
557 st = s->streams[stream_index];
559 case AVMEDIA_TYPE_VIDEO:
561 st->codec->width=avih_width;
562 st->codec->height=avih_height;
563 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
564 st->codec->codec_id = CODEC_ID_AMV;
568 tag1 = ff_get_bmp_header(pb, st);
570 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
571 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
572 st->codec->codec_tag = tag1;
573 st->codec->codec_id = CODEC_ID_XSUB;
577 if(size > 10*4 && size<(1<<30)){
578 st->codec->extradata_size= size - 10*4;
579 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
580 if (!st->codec->extradata) {
581 st->codec->extradata_size= 0;
582 return AVERROR(ENOMEM);
584 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
587 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
590 /* Extract palette from extradata if bpp <= 8. */
591 /* This code assumes that extradata contains only palette. */
592 /* This is true for all paletted codecs implemented in Libav. */
593 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
594 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
595 const uint8_t *pal_src;
597 pal_size = FFMIN(pal_size, st->codec->extradata_size);
598 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
600 for (i = 0; i < pal_size/4; i++)
601 ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]);
603 memcpy(ast->pal, pal_src, pal_size);
608 print_tag("video", tag1, 0);
610 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
611 st->codec->codec_tag = tag1;
612 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
613 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
614 // Support "Resolution 1:1" for Avid AVI Codec
615 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
616 st->codec->extradata_size >= 31 &&
617 !memcmp(&st->codec->extradata[28], "1:1", 3))
618 st->codec->codec_id = CODEC_ID_RAWVIDEO;
620 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
621 st->codec->extradata_size+= 9;
622 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
623 if(st->codec->extradata)
624 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
626 st->codec->height= FFABS(st->codec->height);
628 // avio_skip(pb, size - 5 * 4);
630 case AVMEDIA_TYPE_AUDIO:
631 ret = ff_get_wav_header(pb, st->codec, size);
634 ast->dshow_block_align= st->codec->block_align;
635 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
636 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
637 ast->sample_size= st->codec->block_align;
639 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
641 /* Force parsing as several audio frames can be in
642 * one packet and timestamps refer to packet start. */
643 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
644 /* ADTS header is in extradata, AAC without header must be
645 * stored as exact frames. Parser not needed and it will
647 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
648 st->need_parsing = AVSTREAM_PARSE_NONE;
649 /* AVI files with Xan DPCM audio (wrongly) declare PCM
650 * audio in the header but have Axan as stream_code_tag. */
651 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
652 st->codec->codec_id = CODEC_ID_XAN_DPCM;
653 st->codec->codec_tag = 0;
655 if (amv_file_format){
656 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
657 ast->dshow_block_align = 0;
660 case AVMEDIA_TYPE_SUBTITLE:
661 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
662 st->codec->codec_id = CODEC_ID_PROBE;
665 st->codec->codec_type = AVMEDIA_TYPE_DATA;
666 st->codec->codec_id= CODEC_ID_NONE;
667 st->codec->codec_tag= 0;
673 case MKTAG('i', 'n', 'd', 'x'):
675 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX)){
676 read_braindead_odml_indx(s, 0);
678 avio_seek(pb, i+size, SEEK_SET);
680 case MKTAG('v', 'p', 'r', 'p'):
681 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
682 AVRational active, active_aspect;
684 st = s->streams[stream_index];
691 active_aspect.den= avio_rl16(pb);
692 active_aspect.num= avio_rl16(pb);
693 active.num = avio_rl32(pb);
694 active.den = avio_rl32(pb);
695 avio_rl32(pb); //nbFieldsPerFrame
697 if(active_aspect.num && active_aspect.den && active.num && active.den){
698 st->sample_aspect_ratio= av_div_q(active_aspect, active);
699 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
705 case MKTAG('s', 't', 'r', 'n'):
707 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
712 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
713 "I will ignore it and try to continue anyway.\n");
714 avi->movi_list = avio_tell(pb) - 4;
715 avi->movi_end = avio_size(pb);
725 /* check stream number */
726 if (stream_index != s->nb_streams - 1) {
731 if(!avi->index_loaded && pb->seekable)
733 avi->index_loaded = 1;
734 avi->non_interleaved |= guess_ni_flag(s);
735 for(i=0; i<s->nb_streams; i++){
736 AVStream *st = s->streams[i];
737 if(st->nb_index_entries)
740 if(i==s->nb_streams && avi->non_interleaved) {
741 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
742 avi->non_interleaved=0;
745 if(avi->non_interleaved) {
746 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
750 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
755 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
756 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
758 int score = AVPROBE_SCORE_MAX / 2, ret;
759 AVIStream *ast = st->priv_data;
760 AVInputFormat *sub_demuxer;
761 AVRational time_base;
762 AVIOContext *pb = avio_alloc_context( pkt->data + 7,
764 0, NULL, NULL, NULL, NULL);
766 unsigned int desc_len = avio_rl32(pb);
768 if (desc_len > pb->buf_end - pb->buf_ptr)
771 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
772 avio_skip(pb, desc_len - ret);
774 av_dict_set(&st->metadata, "title", desc, 0);
776 avio_rl16(pb); /* flags? */
777 avio_rl32(pb); /* data size */
779 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
780 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
783 if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
784 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
785 *st->codec = *ast->sub_ctx->streams[0]->codec;
786 ast->sub_ctx->streams[0]->codec->extradata = NULL;
787 time_base = ast->sub_ctx->streams[0]->time_base;
788 av_set_pts_info(st, 64, time_base.num, time_base.den);
790 ast->sub_buffer = pkt->data;
791 memset(pkt, 0, sizeof(*pkt));
799 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
802 AVIStream *ast, *next_ast = next_st->priv_data;
803 int64_t ts, next_ts, ts_min = INT64_MAX;
804 AVStream *st, *sub_st = NULL;
807 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
810 for (i=0; i<s->nb_streams; i++) {
813 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
814 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
815 if (ts <= next_ts && ts < ts_min) {
823 ast = sub_st->priv_data;
825 pkt->stream_index = sub_st->index;
826 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
827 ast->sub_pkt.data = NULL;
832 static int get_stream_idx(int *d){
833 if( d[0] >= '0' && d[0] <= '9'
834 && d[1] >= '0' && d[1] <= '9'){
835 return (d[0] - '0') * 10 + (d[1] - '0');
837 return 100; //invalid stream ID
841 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
843 AVIContext *avi = s->priv_data;
844 AVIOContext *pb = s->pb;
850 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
851 int size = dv_get_packet(avi->dv_demux, pkt);
856 if(avi->non_interleaved){
857 int best_stream_index = 0;
858 AVStream *best_st= NULL;
860 int64_t best_ts= INT64_MAX;
863 for(i=0; i<s->nb_streams; i++){
864 AVStream *st = s->streams[i];
865 AVIStream *ast = st->priv_data;
866 int64_t ts= ast->frame_offset;
869 if(!st->nb_index_entries)
872 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
873 if(!ast->remaining && ts > last_ts)
876 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
878 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
882 best_stream_index= i;
888 best_ast = best_st->priv_data;
889 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
890 if(best_ast->remaining)
891 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
893 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
895 best_ast->frame_offset= best_st->index_entries[i].timestamp;
898 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
900 int64_t pos= best_st->index_entries[i].pos;
901 pos += best_ast->packet_size - best_ast->remaining;
902 avio_seek(s->pb, pos + 8, SEEK_SET);
903 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
905 assert(best_ast->remaining <= best_ast->packet_size);
907 avi->stream_index= best_stream_index;
908 if(!best_ast->remaining)
909 best_ast->packet_size=
910 best_ast->remaining= best_st->index_entries[i].size;
915 if(avi->stream_index >= 0){
916 AVStream *st= s->streams[ avi->stream_index ];
917 AVIStream *ast= st->priv_data;
920 if(get_subtitle_pkt(s, st, pkt))
923 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
925 else if(ast->sample_size < 32)
926 // arbitrary multiplier to avoid tiny packets for raw PCM data
927 size= 1024*ast->sample_size;
929 size= ast->sample_size;
931 if(size > ast->remaining)
932 size= ast->remaining;
933 avi->last_pkt_pos= avio_tell(pb);
934 err= av_get_packet(pb, pkt, size);
938 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
940 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
942 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
944 memcpy(pal, ast->pal, AVPALETTE_SIZE);
949 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
950 dstr = pkt->destruct;
951 size = dv_produce_packet(avi->dv_demux, pkt,
952 pkt->data, pkt->size);
953 pkt->destruct = dstr;
954 pkt->flags |= AV_PKT_FLAG_KEY;
957 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
958 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
960 avi->stream_index = -1;
964 /* XXX: How to handle B-frames in AVI? */
965 pkt->dts = ast->frame_offset;
966 // pkt->dts += ast->start;
968 pkt->dts /= ast->sample_size;
969 //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);
970 pkt->stream_index = avi->stream_index;
972 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
975 assert(st->index_entries);
977 index= av_index_search_timestamp(st, ast->frame_offset, 0);
978 e= &st->index_entries[index];
980 if(index >= 0 && e->timestamp == ast->frame_offset){
981 if (e->flags & AVINDEX_KEYFRAME)
982 pkt->flags |= AV_PKT_FLAG_KEY;
985 pkt->flags |= AV_PKT_FLAG_KEY;
987 ast->frame_offset += get_duration(ast, pkt->size);
989 ast->remaining -= size;
991 avi->stream_index= -1;
998 memset(d, -1, sizeof(int)*8);
999 for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
1006 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1008 n= get_stream_idx(d+2);
1009 //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);
1010 if(i + (uint64_t)size > avi->fsize || d[0]<0)
1014 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1016 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1017 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1018 avio_skip(pb, size);
1019 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1024 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1029 n= get_stream_idx(d);
1031 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1034 //detect ##ix chunk and skip
1035 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1036 avio_skip(pb, size);
1041 if(n < s->nb_streams){
1045 ast = st->priv_data;
1047 if(s->nb_streams>=2){
1048 AVStream *st1 = s->streams[1];
1049 AVIStream *ast1= st1->priv_data;
1050 //workaround for broken small-file-bug402.avi
1051 if( d[2] == 'w' && d[3] == 'b'
1053 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1054 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1055 && ast->prefix == 'd'*256+'c'
1056 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1061 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1066 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1067 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1068 || st->discard >= AVDISCARD_ALL){
1069 ast->frame_offset += get_duration(ast, size);
1070 avio_skip(pb, size);
1074 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1075 int k = avio_r8(pb);
1076 int last = (k + avio_r8(pb) - 1) & 0xFF;
1078 avio_rl16(pb); //flags
1080 for (; k <= last; k++)
1081 ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1084 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1085 d[2]*256+d[3] == ast->prefix /*||
1086 (d[2] == 'd' && d[3] == 'c') ||
1087 (d[2] == 'w' && d[3] == 'b')*/) {
1089 //av_log(s, AV_LOG_DEBUG, "OK\n");
1090 if(d[2]*256+d[3] == ast->prefix)
1091 ast->prefix_count++;
1093 ast->prefix= d[2]*256+d[3];
1094 ast->prefix_count= 0;
1097 avi->stream_index= n;
1098 ast->packet_size= size + 8;
1099 ast->remaining= size;
1101 if(size || !ast->sample_size){
1102 uint64_t pos= avio_tell(pb) - 8;
1103 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1104 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1115 /* XXX: We make the implicit supposition that the positions are sorted
1117 static int avi_read_idx1(AVFormatContext *s, int size)
1119 AVIContext *avi = s->priv_data;
1120 AVIOContext *pb = s->pb;
1121 int nb_index_entries, i;
1124 unsigned int index, tag, flags, pos, len;
1125 unsigned last_pos= -1;
1127 nb_index_entries = size / 16;
1128 if (nb_index_entries <= 0)
1131 /* Read the entries and sort them in each stream component. */
1132 for(i = 0; i < nb_index_entries; i++) {
1133 tag = avio_rl32(pb);
1134 flags = avio_rl32(pb);
1135 pos = avio_rl32(pb);
1136 len = avio_rl32(pb);
1137 #if defined(DEBUG_SEEK)
1138 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1139 i, tag, flags, pos, len);
1141 if(i==0 && pos > avi->movi_list)
1142 avi->movi_list= 0; //FIXME better check
1143 pos += avi->movi_list;
1145 index = ((tag & 0xff) - '0') * 10;
1146 index += ((tag >> 8) & 0xff) - '0';
1147 if (index >= s->nb_streams)
1149 st = s->streams[index];
1150 ast = st->priv_data;
1152 #if defined(DEBUG_SEEK)
1153 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1159 avi->non_interleaved= 1;
1160 else if(len || !ast->sample_size)
1161 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1162 ast->cum_len += get_duration(ast, len);
1168 static int guess_ni_flag(AVFormatContext *s){
1170 int64_t last_start=0;
1171 int64_t first_end= INT64_MAX;
1172 int64_t oldpos= avio_tell(s->pb);
1174 for(i=0; i<s->nb_streams; i++){
1175 AVStream *st = s->streams[i];
1176 int n= st->nb_index_entries;
1183 int64_t pos= st->index_entries[0].pos;
1184 avio_seek(s->pb, pos + 4, SEEK_SET);
1185 size= avio_rl32(s->pb);
1186 if(pos + size > st->index_entries[1].pos)
1187 last_start= INT64_MAX;
1190 if(st->index_entries[0].pos > last_start)
1191 last_start= st->index_entries[0].pos;
1192 if(st->index_entries[n-1].pos < first_end)
1193 first_end= st->index_entries[n-1].pos;
1195 avio_seek(s->pb, oldpos, SEEK_SET);
1196 return last_start > first_end;
1199 static int avi_load_index(AVFormatContext *s)
1201 AVIContext *avi = s->priv_data;
1202 AVIOContext *pb = s->pb;
1204 int64_t pos= avio_tell(pb);
1207 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1208 goto the_end; // maybe truncated file
1210 av_log(s, AV_LOG_DEBUG, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1213 if (pb->eof_reached)
1215 tag = avio_rl32(pb);
1216 size = avio_rl32(pb);
1218 av_log(s, AV_LOG_DEBUG, "tag=%c%c%c%c size=0x%x\n",
1226 case MKTAG('i', 'd', 'x', '1'):
1227 if (avi_read_idx1(s, size) < 0)
1235 if (avio_skip(pb, size) < 0)
1236 goto the_end; // something is wrong here
1241 avio_seek(pb, pos, SEEK_SET);
1245 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1247 AVIStream *ast2 = st2->priv_data;
1248 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1249 av_free_packet(&ast2->sub_pkt);
1250 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1251 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1252 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1255 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1257 AVIContext *avi = s->priv_data;
1263 if (!avi->index_loaded) {
1264 /* we only load the index on demand */
1266 avi->index_loaded = 1;
1268 assert(stream_index>= 0);
1270 st = s->streams[stream_index];
1272 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1276 /* find the position */
1277 pos = st->index_entries[index].pos;
1278 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1280 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1282 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1283 /* One and only one real stream for DV in AVI, and it has video */
1284 /* offsets. Calling with other stream indexes should have failed */
1285 /* the av_index_search_timestamp call above. */
1286 assert(stream_index == 0);
1288 /* Feed the DV video stream version of the timestamp to the */
1289 /* DV demux so it can synthesize correct timestamps. */
1290 dv_offset_reset(avi->dv_demux, timestamp);
1292 avio_seek(s->pb, pos, SEEK_SET);
1293 avi->stream_index= -1;
1297 for(i = 0; i < s->nb_streams; i++) {
1298 AVStream *st2 = s->streams[i];
1299 AVIStream *ast2 = st2->priv_data;
1304 if (ast2->sub_ctx) {
1305 seek_subtitle(st, st2, timestamp);
1309 if (st2->nb_index_entries <= 0)
1312 // assert(st2->codec->block_align);
1313 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1314 index = av_index_search_timestamp(
1316 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1317 flags | AVSEEK_FLAG_BACKWARD);
1321 if(!avi->non_interleaved){
1322 while(index>0 && st2->index_entries[index].pos > pos)
1324 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1328 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1329 /* extract the current frame number */
1330 ast2->frame_offset = st2->index_entries[index].timestamp;
1334 avio_seek(s->pb, pos, SEEK_SET);
1335 avi->stream_index= -1;
1339 static int avi_read_close(AVFormatContext *s)
1342 AVIContext *avi = s->priv_data;
1344 for(i=0;i<s->nb_streams;i++) {
1345 AVStream *st = s->streams[i];
1346 AVIStream *ast = st->priv_data;
1349 av_freep(&ast->sub_ctx->pb);
1350 av_close_input_stream(ast->sub_ctx);
1352 av_free(ast->sub_buffer);
1353 av_free_packet(&ast->sub_pkt);
1357 av_free(avi->dv_demux);
1362 static int avi_probe(AVProbeData *p)
1366 /* check file header */
1367 for(i=0; avi_headers[i][0]; i++)
1368 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1369 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1370 return AVPROBE_SCORE_MAX;
1375 AVInputFormat ff_avi_demuxer = {
1377 NULL_IF_CONFIG_SMALL("AVI format"),