3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/bswap.h"
28 #include "libavcodec/bytestream.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);
88 static void print_tag(const char *str, unsigned int tag, int size)
90 dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
99 static inline int get_duration(AVIStream *ast, int len){
100 if(ast->sample_size){
102 }else if (ast->dshow_block_align){
103 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
108 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
110 AVIContext *avi = s->priv_data;
114 /* check RIFF header */
115 get_buffer(pb, header, 4);
116 avi->riff_end = get_le32(pb); /* RIFF chunk size */
117 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
118 get_buffer(pb, header+4, 4);
120 for(i=0; avi_headers[i][0]; i++)
121 if(!memcmp(header, avi_headers[i], 8))
123 if(!avi_headers[i][0])
126 if(header[7] == 0x19)
127 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
132 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
133 AVIContext *avi = s->priv_data;
134 ByteIOContext *pb = s->pb;
135 int longs_pre_entry= get_le16(pb);
136 int index_sub_type = get_byte(pb);
137 int index_type = get_byte(pb);
138 int entries_in_use = get_le32(pb);
139 int chunk_id = get_le32(pb);
140 int64_t base = get_le64(pb);
141 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
145 int64_t last_pos= -1;
146 int64_t filesize= url_fsize(s->pb);
149 av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
150 longs_pre_entry,index_type, entries_in_use, chunk_id, base);
153 if(stream_id >= s->nb_streams || stream_id < 0)
155 st= s->streams[stream_id];
163 if(index_type && longs_pre_entry != 2)
168 if(filesize > 0 && base >= filesize){
169 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
170 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
176 for(i=0; i<entries_in_use; i++){
178 int64_t pos= get_le32(pb) + base - 8;
179 int len = get_le32(pb);
184 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
189 if(last_pos == pos || pos == base - 8)
190 avi->non_interleaved= 1;
191 if(last_pos != pos && (len || !ast->sample_size))
192 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
194 ast->cum_len += get_duration(ast, len);
199 offset = get_le64(pb);
200 get_le32(pb); /* size */
201 duration = get_le32(pb);
208 if(avi->odml_depth > MAX_ODML_DEPTH){
209 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
213 url_fseek(pb, offset+8, SEEK_SET);
215 read_braindead_odml_indx(s, frame_num);
217 frame_num += duration;
219 url_fseek(pb, pos, SEEK_SET);
226 static void clean_index(AVFormatContext *s){
230 for(i=0; i<s->nb_streams; i++){
231 AVStream *st = s->streams[i];
232 AVIStream *ast = st->priv_data;
233 int n= st->nb_index_entries;
234 int max= ast->sample_size;
235 int64_t pos, size, ts;
237 if(n != 1 || ast->sample_size==0)
240 while(max < 1024) max+=max;
242 pos= st->index_entries[0].pos;
243 size= st->index_entries[0].size;
244 ts= st->index_entries[0].timestamp;
246 for(j=0; j<size; j+=max){
247 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
252 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
254 ByteIOContext *pb = s->pb;
255 char key[5] = {0}, *value;
259 if (size == UINT_MAX)
261 value = av_malloc(size+1);
264 get_buffer(pb, value, size);
270 return av_metadata_set2(&st->metadata, key, value,
271 AV_METADATA_DONT_STRDUP_VAL);
273 return av_metadata_set2(&s->metadata, key, value,
274 AV_METADATA_DONT_STRDUP_VAL);
277 static void avi_read_info(AVFormatContext *s, uint64_t end)
279 while (url_ftell(s->pb) < end) {
280 uint32_t tag = get_le32(s->pb);
281 uint32_t size = get_le32(s->pb);
282 avi_read_tag(s, NULL, tag, size);
286 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
287 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
289 static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
291 char month[4], time[9], buffer[64];
293 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
294 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
295 month, &day, time, &year) == 4)
297 if (!strcasecmp(month, months[i])) {
298 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
299 year, i+1, day, time);
300 av_metadata_set2(metadata, "creation_time", buffer, 0);
304 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
306 AVIContext *avi = s->priv_data;
307 ByteIOContext *pb = s->pb;
308 unsigned int tag, tag1, handler;
309 int codec_type, stream_index, frame_period, bit_rate;
313 AVIStream *ast = NULL;
314 int avih_width=0, avih_height=0;
315 int amv_file_format=0;
316 uint64_t list_end = 0;
318 avi->stream_index= -1;
320 if (get_riff(s, pb) < 0)
323 avi->fsize = url_fsize(pb);
325 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
337 print_tag("tag", tag, size);
341 case MKTAG('L', 'I', 'S', 'T'):
342 list_end = url_ftell(pb) + size;
343 /* Ignored, except at start of video packets. */
346 print_tag("list", tag1, 0);
348 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
349 avi->movi_list = url_ftell(pb) - 4;
350 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
351 else avi->movi_end = url_fsize(pb);
352 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
355 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
356 avi_read_info(s, list_end);
359 case MKTAG('I', 'D', 'I', 'T'): {
360 unsigned char date[64] = {0};
362 size -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));
364 avi_metadata_creation_time(&s->metadata, date);
367 case MKTAG('d', 'm', 'l', 'h'):
369 url_fskip(pb, size + (size & 1));
371 case MKTAG('a', 'm', 'v', 'h'):
373 case MKTAG('a', 'v', 'i', 'h'):
375 /* using frame_period is bad idea */
376 frame_period = get_le32(pb);
377 bit_rate = get_le32(pb) * 8;
379 avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
381 url_fskip(pb, 2 * 4);
384 avih_width=get_le32(pb);
385 avih_height=get_le32(pb);
387 url_fskip(pb, size - 10 * 4);
389 case MKTAG('s', 't', 'r', 'h'):
393 handler = get_le32(pb); /* codec tag */
395 if(tag1 == MKTAG('p', 'a', 'd', 's')){
396 url_fskip(pb, size - 8);
400 st = av_new_stream(s, stream_index);
404 ast = av_mallocz(sizeof(AVIStream));
410 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
413 print_tag("strh", tag1, -1);
415 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
419 * After some consideration -- I don't think we
420 * have to support anything but DV in type1 AVIs.
422 if (s->nb_streams != 1)
425 if (handler != MKTAG('d', 'v', 's', 'd') &&
426 handler != MKTAG('d', 'v', 'h', 'd') &&
427 handler != MKTAG('d', 'v', 's', 'l'))
430 ast = s->streams[0]->priv_data;
431 av_freep(&s->streams[0]->codec->extradata);
432 av_freep(&s->streams[0]->codec);
433 av_freep(&s->streams[0]);
435 if (CONFIG_DV_DEMUXER) {
436 avi->dv_demux = dv_init_demux(s);
440 s->streams[0]->priv_data = ast;
441 url_fskip(pb, 3 * 4);
442 ast->scale = get_le32(pb);
443 ast->rate = get_le32(pb);
444 url_fskip(pb, 4); /* start time */
446 dv_dur = get_le32(pb);
447 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
448 dv_dur *= AV_TIME_BASE;
449 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
452 * else, leave duration alone; timing estimation in utils.c
453 * will make a guess based on bitrate.
456 stream_index = s->nb_streams - 1;
457 url_fskip(pb, size - 9*4);
461 assert(stream_index < s->nb_streams);
462 st->codec->stream_codec_tag= handler;
464 get_le32(pb); /* flags */
465 get_le16(pb); /* priority */
466 get_le16(pb); /* language */
467 get_le32(pb); /* initial frame */
468 ast->scale = get_le32(pb);
469 ast->rate = get_le32(pb);
470 if(!(ast->scale && ast->rate)){
471 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);
474 ast->scale = frame_period;
480 av_set_pts_info(st, 64, ast->scale, ast->rate);
482 ast->cum_len=get_le32(pb); /* start */
483 st->nb_frames = get_le32(pb);
486 get_le32(pb); /* buffer size */
487 get_le32(pb); /* quality */
488 ast->sample_size = get_le32(pb); /* sample ssize */
489 ast->cum_len *= FFMAX(1, ast->sample_size);
490 // av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
493 case MKTAG('v', 'i', 'd', 's'):
494 codec_type = AVMEDIA_TYPE_VIDEO;
496 ast->sample_size = 0;
498 case MKTAG('a', 'u', 'd', 's'):
499 codec_type = AVMEDIA_TYPE_AUDIO;
501 case MKTAG('t', 'x', 't', 's'):
502 codec_type = AVMEDIA_TYPE_SUBTITLE;
504 case MKTAG('d', 'a', 't', 's'):
505 codec_type = AVMEDIA_TYPE_DATA;
508 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
511 if(ast->sample_size == 0)
512 st->duration = st->nb_frames;
513 ast->frame_offset= ast->cum_len;
514 url_fskip(pb, size - 12 * 4);
516 case MKTAG('s', 't', 'r', 'f'):
518 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
521 uint64_t cur_pos = url_ftell(pb);
522 if (cur_pos < list_end)
523 size = FFMIN(size, list_end - cur_pos);
524 st = s->streams[stream_index];
526 case AVMEDIA_TYPE_VIDEO:
528 st->codec->width=avih_width;
529 st->codec->height=avih_height;
530 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
531 st->codec->codec_id = CODEC_ID_AMV;
535 get_le32(pb); /* size */
536 st->codec->width = get_le32(pb);
537 st->codec->height = (int32_t)get_le32(pb);
538 get_le16(pb); /* panes */
539 st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
541 get_le32(pb); /* ImageSize */
542 get_le32(pb); /* XPelsPerMeter */
543 get_le32(pb); /* YPelsPerMeter */
544 get_le32(pb); /* ClrUsed */
545 get_le32(pb); /* ClrImportant */
547 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
548 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
549 st->codec->codec_tag = tag1;
550 st->codec->codec_id = CODEC_ID_XSUB;
554 if(size > 10*4 && size<(1<<30)){
555 st->codec->extradata_size= size - 10*4;
556 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
557 if (!st->codec->extradata) {
558 st->codec->extradata_size= 0;
559 return AVERROR(ENOMEM);
561 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
564 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
567 /* Extract palette from extradata if bpp <= 8. */
568 /* This code assumes that extradata contains only palette. */
569 /* This is true for all paletted codecs implemented in FFmpeg. */
570 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
571 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
573 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
574 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
576 memcpy(st->codec->palctrl->palette, st->codec->extradata,
577 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
579 st->codec->palctrl->palette_changed = 1;
583 print_tag("video", tag1, 0);
585 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
586 st->codec->codec_tag = tag1;
587 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
588 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
589 // Support "Resolution 1:1" for Avid AVI Codec
590 if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
591 st->codec->extradata_size >= 31 &&
592 !memcmp(&st->codec->extradata[28], "1:1", 3))
593 st->codec->codec_id = CODEC_ID_RAWVIDEO;
595 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
596 st->codec->extradata_size+= 9;
597 st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
598 if(st->codec->extradata)
599 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
601 st->codec->height= FFABS(st->codec->height);
603 // url_fskip(pb, size - 5 * 4);
605 case AVMEDIA_TYPE_AUDIO:
606 ff_get_wav_header(pb, st->codec, size);
607 ast->dshow_block_align= st->codec->block_align;
608 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
609 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
610 ast->sample_size= st->codec->block_align;
612 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
614 /* Force parsing as several audio frames can be in
615 * one packet and timestamps refer to packet start. */
616 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
617 /* ADTS header is in extradata, AAC without header must be
618 * stored as exact frames. Parser not needed and it will
620 if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
621 st->need_parsing = AVSTREAM_PARSE_NONE;
622 /* AVI files with Xan DPCM audio (wrongly) declare PCM
623 * audio in the header but have Axan as stream_code_tag. */
624 if (st->codec->stream_codec_tag == AV_RL32("Axan")){
625 st->codec->codec_id = CODEC_ID_XAN_DPCM;
626 st->codec->codec_tag = 0;
628 if (amv_file_format){
629 st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
630 ast->dshow_block_align = 0;
633 case AVMEDIA_TYPE_SUBTITLE:
634 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
635 st->codec->codec_id = CODEC_ID_PROBE;
638 st->codec->codec_type = AVMEDIA_TYPE_DATA;
639 st->codec->codec_id= CODEC_ID_NONE;
640 st->codec->codec_tag= 0;
646 case MKTAG('i', 'n', 'd', 'x'):
648 if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
649 read_braindead_odml_indx(s, 0);
651 url_fseek(pb, i+size, SEEK_SET);
653 case MKTAG('v', 'p', 'r', 'p'):
654 if(stream_index < (unsigned)s->nb_streams && size > 9*4){
655 AVRational active, active_aspect;
657 st = s->streams[stream_index];
664 active_aspect.den= get_le16(pb);
665 active_aspect.num= get_le16(pb);
666 active.num = get_le32(pb);
667 active.den = get_le32(pb);
668 get_le32(pb); //nbFieldsPerFrame
670 if(active_aspect.num && active_aspect.den && active.num && active.den){
671 st->sample_aspect_ratio= av_div_q(active_aspect, active);
672 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
676 url_fseek(pb, size, SEEK_CUR);
678 case MKTAG('s', 't', 'r', 'n'):
680 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
685 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
686 "I will ignore it and try to continue anyway.\n");
687 avi->movi_list = url_ftell(pb) - 4;
688 avi->movi_end = url_fsize(pb);
698 /* check stream number */
699 if (stream_index != s->nb_streams - 1) {
704 if(!avi->index_loaded && !url_is_streamed(pb))
706 avi->index_loaded = 1;
707 avi->non_interleaved |= guess_ni_flag(s);
708 for(i=0; i<s->nb_streams; i++){
709 AVStream *st = s->streams[i];
710 if(st->nb_index_entries)
713 if(i==s->nb_streams && avi->non_interleaved) {
714 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
715 avi->non_interleaved=0;
718 if(avi->non_interleaved) {
719 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
723 ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
728 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
729 if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
730 uint8_t desc[256], *d = desc;
731 uint8_t *end, *ptr = pkt->data+7;
732 unsigned int size, desc_len = bytestream_get_le32(&ptr);
733 int score = AVPROBE_SCORE_MAX / 2;
734 AVIStream *ast = st->priv_data;
735 AVInputFormat *sub_demuxer;
736 AVRational time_base;
740 if (desc_len > FFMAX(pkt->size-17, 0))
743 end = ptr + desc_len;
744 while (ptr < end-1) {
747 GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);
748 PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1) *d++ = tmp;);
752 av_metadata_set2(&st->metadata, "title", desc, 0);
755 size = bytestream_get_le32(&ptr);
756 size = FFMIN(size, pkt->size+pkt->data-ptr);
758 pd = (AVProbeData) { .buf = ptr, .buf_size = size };
759 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
762 pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);
763 if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
764 av_read_packet(ast->sub_ctx, &ast->sub_pkt);
765 *st->codec = *ast->sub_ctx->streams[0]->codec;
766 ast->sub_ctx->streams[0]->codec->extradata = NULL;
767 time_base = ast->sub_ctx->streams[0]->time_base;
768 av_set_pts_info(st, 64, time_base.num, time_base.den);
770 ast->sub_buffer = pkt->data;
771 memset(pkt, 0, sizeof(*pkt));
777 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
780 AVIStream *ast, *next_ast = next_st->priv_data;
781 int64_t ts, next_ts, ts_min = INT64_MAX;
782 AVStream *st, *sub_st = NULL;
785 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
788 for (i=0; i<s->nb_streams; i++) {
791 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
792 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
793 if (ts <= next_ts && ts < ts_min) {
801 ast = sub_st->priv_data;
803 pkt->stream_index = sub_st->index;
804 if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
805 ast->sub_pkt.data = NULL;
810 static int get_stream_idx(int *d){
811 if( d[0] >= '0' && d[0] <= '9'
812 && d[1] >= '0' && d[1] <= '9'){
813 return (d[0] - '0') * 10 + (d[1] - '0');
815 return 100; //invalid stream ID
819 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
821 AVIContext *avi = s->priv_data;
822 ByteIOContext *pb = s->pb;
828 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
829 int size = dv_get_packet(avi->dv_demux, pkt);
834 if(avi->non_interleaved){
835 int best_stream_index = 0;
836 AVStream *best_st= NULL;
838 int64_t best_ts= INT64_MAX;
841 for(i=0; i<s->nb_streams; i++){
842 AVStream *st = s->streams[i];
843 AVIStream *ast = st->priv_data;
844 int64_t ts= ast->frame_offset;
847 if(!st->nb_index_entries)
850 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
851 if(!ast->remaining && ts > last_ts)
854 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
856 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
860 best_stream_index= i;
866 best_ast = best_st->priv_data;
867 best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
868 if(best_ast->remaining)
869 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
871 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
873 best_ast->frame_offset= best_st->index_entries[i].timestamp;
876 // av_log(s, AV_LOG_DEBUG, "%d\n", i);
878 int64_t pos= best_st->index_entries[i].pos;
879 pos += best_ast->packet_size - best_ast->remaining;
880 url_fseek(s->pb, pos + 8, SEEK_SET);
881 // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
883 assert(best_ast->remaining <= best_ast->packet_size);
885 avi->stream_index= best_stream_index;
886 if(!best_ast->remaining)
887 best_ast->packet_size=
888 best_ast->remaining= best_st->index_entries[i].size;
893 if(avi->stream_index >= 0){
894 AVStream *st= s->streams[ avi->stream_index ];
895 AVIStream *ast= st->priv_data;
898 if(get_subtitle_pkt(s, st, pkt))
901 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
903 else if(ast->sample_size < 32)
904 // arbitrary multiplier to avoid tiny packets for raw PCM data
905 size= 1024*ast->sample_size;
907 size= ast->sample_size;
909 if(size > ast->remaining)
910 size= ast->remaining;
911 avi->last_pkt_pos= url_ftell(pb);
912 err= av_get_packet(pb, pkt, size);
916 if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
917 void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
922 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
924 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
927 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
928 dstr = pkt->destruct;
929 size = dv_produce_packet(avi->dv_demux, pkt,
930 pkt->data, pkt->size);
931 pkt->destruct = dstr;
932 pkt->flags |= AV_PKT_FLAG_KEY;
935 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
936 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
938 avi->stream_index = -1;
942 /* XXX: How to handle B-frames in AVI? */
943 pkt->dts = ast->frame_offset;
944 // pkt->dts += ast->start;
946 pkt->dts /= ast->sample_size;
947 //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);
948 pkt->stream_index = avi->stream_index;
950 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
953 assert(st->index_entries);
955 index= av_index_search_timestamp(st, ast->frame_offset, 0);
956 e= &st->index_entries[index];
958 if(index >= 0 && e->timestamp == ast->frame_offset){
959 if (e->flags & AVINDEX_KEYFRAME)
960 pkt->flags |= AV_PKT_FLAG_KEY;
963 pkt->flags |= AV_PKT_FLAG_KEY;
965 ast->frame_offset += get_duration(ast, pkt->size);
967 ast->remaining -= size;
969 avi->stream_index= -1;
976 memset(d, -1, sizeof(int)*8);
977 for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
984 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
986 n= get_stream_idx(d+2);
987 //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);
988 if(i + (uint64_t)size > avi->fsize || d[0]<0)
992 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
994 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
995 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
997 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
1002 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1007 n= get_stream_idx(d);
1009 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1012 //detect ##ix chunk and skip
1013 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1014 url_fskip(pb, size);
1019 if(n < s->nb_streams){
1023 ast = st->priv_data;
1025 if(s->nb_streams>=2){
1026 AVStream *st1 = s->streams[1];
1027 AVIStream *ast1= st1->priv_data;
1028 //workaround for broken small-file-bug402.avi
1029 if( d[2] == 'w' && d[3] == 'b'
1031 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1032 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1033 && ast->prefix == 'd'*256+'c'
1034 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1039 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1044 if( (st->discard >= AVDISCARD_DEFAULT && size==0)
1045 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1046 || st->discard >= AVDISCARD_ALL){
1047 ast->frame_offset += get_duration(ast, size);
1048 url_fskip(pb, size);
1052 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1053 int k = get_byte(pb);
1054 int last = (k + get_byte(pb) - 1) & 0xFF;
1056 get_le16(pb); //flags
1058 for (; k <= last; k++)
1059 ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
1062 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1063 d[2]*256+d[3] == ast->prefix /*||
1064 (d[2] == 'd' && d[3] == 'c') ||
1065 (d[2] == 'w' && d[3] == 'b')*/) {
1067 //av_log(s, AV_LOG_DEBUG, "OK\n");
1068 if(d[2]*256+d[3] == ast->prefix)
1069 ast->prefix_count++;
1071 ast->prefix= d[2]*256+d[3];
1072 ast->prefix_count= 0;
1075 avi->stream_index= n;
1076 ast->packet_size= size + 8;
1077 ast->remaining= size;
1079 if(size || !ast->sample_size){
1080 uint64_t pos= url_ftell(pb) - 8;
1081 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1082 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1093 /* XXX: We make the implicit supposition that the positions are sorted
1095 static int avi_read_idx1(AVFormatContext *s, int size)
1097 AVIContext *avi = s->priv_data;
1098 ByteIOContext *pb = s->pb;
1099 int nb_index_entries, i;
1102 unsigned int index, tag, flags, pos, len;
1103 unsigned last_pos= -1;
1105 nb_index_entries = size / 16;
1106 if (nb_index_entries <= 0)
1109 /* Read the entries and sort them in each stream component. */
1110 for(i = 0; i < nb_index_entries; i++) {
1112 flags = get_le32(pb);
1115 #if defined(DEBUG_SEEK)
1116 av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1117 i, tag, flags, pos, len);
1119 if(i==0 && pos > avi->movi_list)
1120 avi->movi_list= 0; //FIXME better check
1121 pos += avi->movi_list;
1123 index = ((tag & 0xff) - '0') * 10;
1124 index += ((tag >> 8) & 0xff) - '0';
1125 if (index >= s->nb_streams)
1127 st = s->streams[index];
1128 ast = st->priv_data;
1130 #if defined(DEBUG_SEEK)
1131 av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1137 avi->non_interleaved= 1;
1138 else if(len || !ast->sample_size)
1139 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1140 ast->cum_len += get_duration(ast, len);
1146 static int guess_ni_flag(AVFormatContext *s){
1148 int64_t last_start=0;
1149 int64_t first_end= INT64_MAX;
1150 int64_t oldpos= url_ftell(s->pb);
1152 for(i=0; i<s->nb_streams; i++){
1153 AVStream *st = s->streams[i];
1154 int n= st->nb_index_entries;
1161 int64_t pos= st->index_entries[0].pos;
1162 url_fseek(s->pb, pos + 4, SEEK_SET);
1163 size= get_le32(s->pb);
1164 if(pos + size > st->index_entries[1].pos)
1165 last_start= INT64_MAX;
1168 if(st->index_entries[0].pos > last_start)
1169 last_start= st->index_entries[0].pos;
1170 if(st->index_entries[n-1].pos < first_end)
1171 first_end= st->index_entries[n-1].pos;
1173 url_fseek(s->pb, oldpos, SEEK_SET);
1174 return last_start > first_end;
1177 static int avi_load_index(AVFormatContext *s)
1179 AVIContext *avi = s->priv_data;
1180 ByteIOContext *pb = s->pb;
1182 int64_t pos= url_ftell(pb);
1185 if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
1186 goto the_end; // maybe truncated file
1188 printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1194 size = get_le32(pb);
1196 printf("tag=%c%c%c%c size=0x%x\n",
1204 case MKTAG('i', 'd', 'x', '1'):
1205 if (avi_read_idx1(s, size) < 0)
1213 if (url_fseek(pb, size, SEEK_CUR) < 0)
1214 goto the_end; // something is wrong here
1219 url_fseek(pb, pos, SEEK_SET);
1223 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1225 AVIStream *ast2 = st2->priv_data;
1226 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1227 av_free_packet(&ast2->sub_pkt);
1228 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1229 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1230 av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1233 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1235 AVIContext *avi = s->priv_data;
1241 if (!avi->index_loaded) {
1242 /* we only load the index on demand */
1244 avi->index_loaded = 1;
1246 assert(stream_index>= 0);
1248 st = s->streams[stream_index];
1250 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1254 /* find the position */
1255 pos = st->index_entries[index].pos;
1256 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1258 // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1260 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1261 /* One and only one real stream for DV in AVI, and it has video */
1262 /* offsets. Calling with other stream indexes should have failed */
1263 /* the av_index_search_timestamp call above. */
1264 assert(stream_index == 0);
1266 /* Feed the DV video stream version of the timestamp to the */
1267 /* DV demux so it can synthesize correct timestamps. */
1268 dv_offset_reset(avi->dv_demux, timestamp);
1270 url_fseek(s->pb, pos, SEEK_SET);
1271 avi->stream_index= -1;
1275 for(i = 0; i < s->nb_streams; i++) {
1276 AVStream *st2 = s->streams[i];
1277 AVIStream *ast2 = st2->priv_data;
1282 if (ast2->sub_ctx) {
1283 seek_subtitle(st, st2, timestamp);
1287 if (st2->nb_index_entries <= 0)
1290 // assert(st2->codec->block_align);
1291 assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1292 index = av_index_search_timestamp(
1294 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1295 flags | AVSEEK_FLAG_BACKWARD);
1299 if(!avi->non_interleaved){
1300 while(index>0 && st2->index_entries[index].pos > pos)
1302 while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1306 // av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1307 /* extract the current frame number */
1308 ast2->frame_offset = st2->index_entries[index].timestamp;
1312 url_fseek(s->pb, pos, SEEK_SET);
1313 avi->stream_index= -1;
1317 static int avi_read_close(AVFormatContext *s)
1320 AVIContext *avi = s->priv_data;
1322 for(i=0;i<s->nb_streams;i++) {
1323 AVStream *st = s->streams[i];
1324 AVIStream *ast = st->priv_data;
1325 av_free(st->codec->palctrl);
1328 av_freep(&ast->sub_ctx->pb);
1329 av_close_input_stream(ast->sub_ctx);
1331 av_free(ast->sub_buffer);
1332 av_free_packet(&ast->sub_pkt);
1337 av_free(avi->dv_demux);
1342 static int avi_probe(AVProbeData *p)
1346 /* check file header */
1347 for(i=0; avi_headers[i][0]; i++)
1348 if(!memcmp(p->buf , avi_headers[i] , 4) &&
1349 !memcmp(p->buf+8, avi_headers[i]+4, 4))
1350 return AVPROBE_SCORE_MAX;
1355 AVInputFormat avi_demuxer = {
1357 NULL_IF_CONFIG_SMALL("AVI format"),