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
32 typedef struct AVIStream
{
33 int64_t frame_offset
; /* current frame (video) or byte (audio) counter
34 (used to compute the pts) */
40 int sample_size
; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
42 int64_t cum_len
; /* temporary storage (used during seek) */
44 int prefix
; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
59 DVDemuxContext
* dv_demux
;
62 static const char avi_headers
[][8] = {
63 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
64 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
65 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
66 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
67 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
71 static int avi_load_index(AVFormatContext
*s
);
72 static int guess_ni_flag(AVFormatContext
*s
);
75 static void print_tag(const char *str
, unsigned int tag
, int size
)
77 printf("%s: tag=%c%c%c%c size=0x%x\n",
86 static int get_riff(AVIContext
*avi
, ByteIOContext
*pb
)
91 /* check RIFF header */
92 get_buffer(pb
, header
, 4);
93 avi
->riff_end
= get_le32(pb
); /* RIFF chunk size */
94 avi
->riff_end
+= url_ftell(pb
); /* RIFF chunk end */
95 get_buffer(pb
, header
+4, 4);
97 for(i
=0; avi_headers
[i
][0]; i
++)
98 if(!memcmp(header
, avi_headers
[i
], 8))
100 if(!avi_headers
[i
][0])
103 if(header
[7] == 0x19)
104 av_log(NULL
, AV_LOG_INFO
, "This file has been generated by a totally broken muxer.\n");
109 static int read_braindead_odml_indx(AVFormatContext
*s
, int frame_num
){
110 AVIContext
*avi
= s
->priv_data
;
111 ByteIOContext
*pb
= s
->pb
;
112 int longs_pre_entry
= get_le16(pb
);
113 int index_sub_type
= get_byte(pb
);
114 int index_type
= get_byte(pb
);
115 int entries_in_use
= get_le32(pb
);
116 int chunk_id
= get_le32(pb
);
117 int64_t base
= get_le64(pb
);
118 int stream_id
= 10*((chunk_id
&0xFF) - '0') + (((chunk_id
>>8)&0xFF) - '0');
122 int64_t last_pos
= -1;
123 int64_t filesize
= url_fsize(s
->pb
);
126 av_log(s
, AV_LOG_ERROR
, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64
"\n",
127 longs_pre_entry
,index_type
, entries_in_use
, chunk_id
, base
);
130 if(stream_id
> s
->nb_streams
|| stream_id
< 0)
132 st
= s
->streams
[stream_id
];
140 if(index_type
&& longs_pre_entry
!= 2)
145 if(filesize
> 0 && base
>= filesize
){
146 av_log(s
, AV_LOG_ERROR
, "ODML index invalid\n");
147 if(base
>>32 == (base
& 0xFFFFFFFF) && (base
& 0xFFFFFFFF) < filesize
&& filesize
<= 0xFFFFFFFF)
153 for(i
=0; i
<entries_in_use
; i
++){
155 int64_t pos
= get_le32(pb
) + base
- 8;
156 int len
= get_le32(pb
);
161 av_log(s
, AV_LOG_ERROR
, "pos:%"PRId64
", len:%X\n", pos
, len
);
163 if(last_pos
== pos
|| pos
== base
- 8)
164 avi
->non_interleaved
= 1;
166 av_add_index_entry(st
, pos
, ast
->cum_len
/ FFMAX(1, ast
->sample_size
), len
, 0, key
? AVINDEX_KEYFRAME
: 0);
176 offset
= get_le64(pb
);
177 get_le32(pb
); /* size */
178 duration
= get_le32(pb
);
181 url_fseek(pb
, offset
+8, SEEK_SET
);
182 read_braindead_odml_indx(s
, frame_num
);
183 frame_num
+= duration
;
185 url_fseek(pb
, pos
, SEEK_SET
);
192 static void clean_index(AVFormatContext
*s
){
196 for(i
=0; i
<s
->nb_streams
; i
++){
197 AVStream
*st
= s
->streams
[i
];
198 AVIStream
*ast
= st
->priv_data
;
199 int n
= st
->nb_index_entries
;
200 int max
= ast
->sample_size
;
201 int64_t pos
, size
, ts
;
203 if(n
!= 1 || ast
->sample_size
==0)
206 while(max
< 1024) max
+=max
;
208 pos
= st
->index_entries
[0].pos
;
209 size
= st
->index_entries
[0].size
;
210 ts
= st
->index_entries
[0].timestamp
;
212 for(j
=0; j
<size
; j
+=max
){
213 av_add_index_entry(st
, pos
+j
, ts
+ j
/ast
->sample_size
, FFMIN(max
, size
-j
), 0, AVINDEX_KEYFRAME
);
218 static int avi_read_tag(ByteIOContext
*pb
, char *buf
, int maxlen
, unsigned int size
)
220 offset_t i
= url_ftell(pb
);
222 get_strz(pb
, buf
, maxlen
);
223 url_fseek(pb
, i
+size
, SEEK_SET
);
227 static int avi_read_header(AVFormatContext
*s
, AVFormatParameters
*ap
)
229 AVIContext
*avi
= s
->priv_data
;
230 ByteIOContext
*pb
= s
->pb
;
231 uint32_t tag
, tag1
, handler
;
232 int codec_type
, stream_index
, frame_period
, bit_rate
;
233 unsigned int size
, nb_frames
;
236 AVIStream
*ast
= NULL
;
238 int avih_width
=0, avih_height
=0;
239 int amv_file_format
=0;
241 avi
->stream_index
= -1;
243 if (get_riff(avi
, pb
) < 0)
246 avi
->fsize
= url_fsize(pb
);
248 avi
->fsize
= avi
->riff_end
;
260 print_tag("tag", tag
, size
);
264 case MKTAG('L', 'I', 'S', 'T'):
265 /* Ignored, except at start of video packets. */
268 print_tag("list", tag1
, 0);
270 if (tag1
== MKTAG('m', 'o', 'v', 'i')) {
271 avi
->movi_list
= url_ftell(pb
) - 4;
272 if(size
) avi
->movi_end
= avi
->movi_list
+ size
+ (size
& 1);
273 else avi
->movi_end
= url_fsize(pb
);
275 printf("movi end=%"PRIx64
"\n", avi
->movi_end
);
280 case MKTAG('d', 'm', 'l', 'h'):
282 url_fskip(pb
, size
+ (size
& 1));
284 case MKTAG('a', 'm', 'v', 'h'):
286 case MKTAG('a', 'v', 'i', 'h'):
288 /* using frame_period is bad idea */
289 frame_period
= get_le32(pb
);
290 bit_rate
= get_le32(pb
) * 8;
292 avi
->non_interleaved
|= get_le32(pb
) & AVIF_MUSTUSEINDEX
;
294 url_fskip(pb
, 2 * 4);
297 avih_width
=get_le32(pb
);
298 avih_height
=get_le32(pb
);
300 url_fskip(pb
, size
- 10 * 4);
302 case MKTAG('s', 't', 'r', 'h'):
306 handler
= get_le32(pb
); /* codec tag */
308 if(tag1
== MKTAG('p', 'a', 'd', 's')){
309 url_fskip(pb
, size
- 8);
313 st
= av_new_stream(s
, stream_index
);
317 ast
= av_mallocz(sizeof(AVIStream
));
323 tag1
= stream_index
? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
326 print_tag("strh", tag1
, -1);
328 if(tag1
== MKTAG('i', 'a', 'v', 's') || tag1
== MKTAG('i', 'v', 'a', 's')){
332 * After some consideration -- I don't think we
333 * have to support anything but DV in type1 AVIs.
335 if (s
->nb_streams
!= 1)
338 if (handler
!= MKTAG('d', 'v', 's', 'd') &&
339 handler
!= MKTAG('d', 'v', 'h', 'd') &&
340 handler
!= MKTAG('d', 'v', 's', 'l'))
343 ast
= s
->streams
[0]->priv_data
;
344 av_freep(&s
->streams
[0]->codec
->extradata
);
345 av_freep(&s
->streams
[0]);
347 if (ENABLE_DV_DEMUXER
) {
348 avi
->dv_demux
= dv_init_demux(s
);
352 s
->streams
[0]->priv_data
= ast
;
353 url_fskip(pb
, 3 * 4);
354 ast
->scale
= get_le32(pb
);
355 ast
->rate
= get_le32(pb
);
356 url_fskip(pb
, 4); /* start time */
358 dv_dur
= get_le32(pb
);
359 if (ast
->scale
> 0 && ast
->rate
> 0 && dv_dur
> 0) {
360 dv_dur
*= AV_TIME_BASE
;
361 s
->duration
= av_rescale(dv_dur
, ast
->scale
, ast
->rate
);
364 * else, leave duration alone; timing estimation in utils.c
365 * will make a guess based on bitrate.
368 stream_index
= s
->nb_streams
- 1;
369 url_fskip(pb
, size
- 9*4);
373 assert(stream_index
< s
->nb_streams
);
374 st
->codec
->stream_codec_tag
= handler
;
376 get_le32(pb
); /* flags */
377 get_le16(pb
); /* priority */
378 get_le16(pb
); /* language */
379 get_le32(pb
); /* initial frame */
380 ast
->scale
= get_le32(pb
);
381 ast
->rate
= get_le32(pb
);
382 if(!(ast
->scale
&& ast
->rate
)){
383 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
);
386 ast
->scale
= frame_period
;
392 av_set_pts_info(st
, 64, ast
->scale
, ast
->rate
);
394 ast
->cum_len
=get_le32(pb
); /* start */
395 nb_frames
= get_le32(pb
);
398 st
->duration
= nb_frames
;
399 get_le32(pb
); /* buffer size */
400 get_le32(pb
); /* quality */
401 ast
->sample_size
= get_le32(pb
); /* sample ssize */
402 ast
->cum_len
*= FFMAX(1, ast
->sample_size
);
403 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
406 case MKTAG('v', 'i', 'd', 's'):
407 codec_type
= CODEC_TYPE_VIDEO
;
409 ast
->sample_size
= 0;
411 case MKTAG('a', 'u', 'd', 's'):
412 codec_type
= CODEC_TYPE_AUDIO
;
414 case MKTAG('t', 'x', 't', 's'):
416 codec_type
= CODEC_TYPE_DATA
; //CODEC_TYPE_SUB ? FIXME
418 case MKTAG('d', 'a', 't', 's'):
419 codec_type
= CODEC_TYPE_DATA
;
422 av_log(s
, AV_LOG_ERROR
, "unknown stream type %X\n", tag1
);
425 ast
->frame_offset
= ast
->cum_len
;
426 url_fskip(pb
, size
- 12 * 4);
428 case MKTAG('s', 't', 'r', 'f'):
430 if (stream_index
>= (unsigned)s
->nb_streams
|| avi
->dv_demux
) {
433 st
= s
->streams
[stream_index
];
435 case CODEC_TYPE_VIDEO
:
437 st
->codec
->width
=avih_width
;
438 st
->codec
->height
=avih_height
;
439 st
->codec
->codec_type
= CODEC_TYPE_VIDEO
;
440 st
->codec
->codec_id
= CODEC_ID_AMV
;
444 get_le32(pb
); /* size */
445 st
->codec
->width
= get_le32(pb
);
446 st
->codec
->height
= get_le32(pb
);
447 get_le16(pb
); /* panes */
448 st
->codec
->bits_per_coded_sample
= get_le16(pb
); /* depth */
450 get_le32(pb
); /* ImageSize */
451 get_le32(pb
); /* XPelsPerMeter */
452 get_le32(pb
); /* YPelsPerMeter */
453 get_le32(pb
); /* ClrUsed */
454 get_le32(pb
); /* ClrImportant */
456 if (tag1
== MKTAG('D', 'X', 'S', 'B')) {
457 st
->codec
->codec_type
= CODEC_TYPE_SUBTITLE
;
458 st
->codec
->codec_tag
= tag1
;
459 st
->codec
->codec_id
= CODEC_ID_XSUB
;
463 if(size
> 10*4 && size
<(1<<30)){
464 st
->codec
->extradata_size
= size
- 10*4;
465 st
->codec
->extradata
= av_malloc(st
->codec
->extradata_size
+ FF_INPUT_BUFFER_PADDING_SIZE
);
466 get_buffer(pb
, st
->codec
->extradata
, st
->codec
->extradata_size
);
469 if(st
->codec
->extradata_size
& 1) //FIXME check if the encoder really did this correctly
472 /* Extract palette from extradata if bpp <= 8. */
473 /* This code assumes that extradata contains only palette. */
474 /* This is true for all paletted codecs implemented in FFmpeg. */
475 if (st
->codec
->extradata_size
&& (st
->codec
->bits_per_coded_sample
<= 8)) {
476 st
->codec
->palctrl
= av_mallocz(sizeof(AVPaletteControl
));
477 #ifdef WORDS_BIGENDIAN
478 for (i
= 0; i
< FFMIN(st
->codec
->extradata_size
, AVPALETTE_SIZE
)/4; i
++)
479 st
->codec
->palctrl
->palette
[i
] = bswap_32(((uint32_t*)st
->codec
->extradata
)[i
]);
481 memcpy(st
->codec
->palctrl
->palette
, st
->codec
->extradata
,
482 FFMIN(st
->codec
->extradata_size
, AVPALETTE_SIZE
));
484 st
->codec
->palctrl
->palette_changed
= 1;
488 print_tag("video", tag1
, 0);
490 st
->codec
->codec_type
= CODEC_TYPE_VIDEO
;
491 st
->codec
->codec_tag
= tag1
;
492 st
->codec
->codec_id
= codec_get_id(codec_bmp_tags
, tag1
);
493 st
->need_parsing
= AVSTREAM_PARSE_HEADERS
; // This is needed to get the pict type which is necessary for generating correct pts.
494 // url_fskip(pb, size - 5 * 4);
496 case CODEC_TYPE_AUDIO
:
497 get_wav_header(pb
, st
->codec
, size
);
498 if(ast
->sample_size
&& st
->codec
->block_align
&& ast
->sample_size
!= st
->codec
->block_align
){
499 av_log(s
, AV_LOG_WARNING
, "sample size (%d) != block align (%d)\n", ast
->sample_size
, st
->codec
->block_align
);
500 ast
->sample_size
= st
->codec
->block_align
;
502 if (size
%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
504 /* Force parsing as several audio frames can be in
505 * one packet and timestamps refer to packet start. */
506 st
->need_parsing
= AVSTREAM_PARSE_TIMESTAMPS
;
507 /* ADTS header is in extradata, AAC without header must be
508 * stored as exact frames. Parser not needed and it will
510 if (st
->codec
->codec_id
== CODEC_ID_AAC
&& st
->codec
->extradata_size
)
511 st
->need_parsing
= AVSTREAM_PARSE_NONE
;
512 /* AVI files with Xan DPCM audio (wrongly) declare PCM
513 * audio in the header but have Axan as stream_code_tag. */
514 if (st
->codec
->stream_codec_tag
== ff_get_fourcc("Axan")){
515 st
->codec
->codec_id
= CODEC_ID_XAN_DPCM
;
516 st
->codec
->codec_tag
= 0;
519 st
->codec
->codec_id
= CODEC_ID_ADPCM_IMA_AMV
;
522 st
->codec
->codec_type
= CODEC_TYPE_DATA
;
523 st
->codec
->codec_id
= CODEC_ID_NONE
;
524 st
->codec
->codec_tag
= 0;
530 case MKTAG('i', 'n', 'd', 'x'):
532 if(!url_is_streamed(pb
) && !(s
->flags
& AVFMT_FLAG_IGNIDX
)){
533 read_braindead_odml_indx(s
, 0);
535 url_fseek(pb
, i
+size
, SEEK_SET
);
537 case MKTAG('v', 'p', 'r', 'p'):
538 if(stream_index
< (unsigned)s
->nb_streams
&& size
> 9*4){
539 AVRational active
, active_aspect
;
541 st
= s
->streams
[stream_index
];
548 active_aspect
.den
= get_le16(pb
);
549 active_aspect
.num
= get_le16(pb
);
550 active
.num
= get_le32(pb
);
551 active
.den
= get_le32(pb
);
552 get_le32(pb
); //nbFieldsPerFrame
554 if(active_aspect
.num
&& active_aspect
.den
&& active
.num
&& active
.den
){
555 st
->sample_aspect_ratio
= av_div_q(active_aspect
, active
);
556 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
560 url_fseek(pb
, size
, SEEK_CUR
);
562 case MKTAG('I', 'N', 'A', 'M'):
563 avi_read_tag(pb
, s
->title
, sizeof(s
->title
), size
);
565 case MKTAG('I', 'A', 'R', 'T'):
566 avi_read_tag(pb
, s
->author
, sizeof(s
->author
), size
);
568 case MKTAG('I', 'C', 'O', 'P'):
569 avi_read_tag(pb
, s
->copyright
, sizeof(s
->copyright
), size
);
571 case MKTAG('I', 'C', 'M', 'T'):
572 avi_read_tag(pb
, s
->comment
, sizeof(s
->comment
), size
);
574 case MKTAG('I', 'G', 'N', 'R'):
575 avi_read_tag(pb
, s
->genre
, sizeof(s
->genre
), size
);
577 case MKTAG('I', 'P', 'R', 'D'):
578 avi_read_tag(pb
, s
->album
, sizeof(s
->album
), size
);
580 case MKTAG('I', 'P', 'R', 'T'):
581 avi_read_tag(pb
, str_track
, sizeof(str_track
), size
);
582 sscanf(str_track
, "%d", &s
->track
);
586 av_log(s
, AV_LOG_ERROR
, "Something went wrong during header parsing, "
587 "I will ignore it and try to continue anyway.\n");
588 avi
->movi_list
= url_ftell(pb
) - 4;
589 avi
->movi_end
= url_fsize(pb
);
599 /* check stream number */
600 if (stream_index
!= s
->nb_streams
- 1) {
605 if(!avi
->index_loaded
&& !url_is_streamed(pb
))
607 avi
->index_loaded
= 1;
608 avi
->non_interleaved
|= guess_ni_flag(s
);
609 if(avi
->non_interleaved
) {
610 av_log(s
, AV_LOG_INFO
, "non-interleaved AVI\n");
617 static int avi_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
619 AVIContext
*avi
= s
->priv_data
;
620 ByteIOContext
*pb
= s
->pb
;
625 if (ENABLE_DV_DEMUXER
&& avi
->dv_demux
) {
626 size
= dv_get_packet(avi
->dv_demux
, pkt
);
631 if(avi
->non_interleaved
){
632 int best_stream_index
= 0;
633 AVStream
*best_st
= NULL
;
635 int64_t best_ts
= INT64_MAX
;
638 for(i
=0; i
<s
->nb_streams
; i
++){
639 AVStream
*st
= s
->streams
[i
];
640 AVIStream
*ast
= st
->priv_data
;
641 int64_t ts
= ast
->frame_offset
;
644 ts
/= ast
->sample_size
;
645 ts
= av_rescale(ts
, AV_TIME_BASE
* (int64_t)st
->time_base
.num
, st
->time_base
.den
);
647 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
648 if(ts
< best_ts
&& st
->nb_index_entries
){
651 best_stream_index
= i
;
657 best_ast
= best_st
->priv_data
;
658 best_ts
= av_rescale(best_ts
, best_st
->time_base
.den
, AV_TIME_BASE
* (int64_t)best_st
->time_base
.num
); //FIXME a little ugly
659 if(best_ast
->remaining
)
660 i
= av_index_search_timestamp(best_st
, best_ts
, AVSEEK_FLAG_ANY
| AVSEEK_FLAG_BACKWARD
);
662 i
= av_index_search_timestamp(best_st
, best_ts
, AVSEEK_FLAG_ANY
);
664 // av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
666 int64_t pos
= best_st
->index_entries
[i
].pos
;
667 pos
+= best_ast
->packet_size
- best_ast
->remaining
;
668 url_fseek(s
->pb
, pos
+ 8, SEEK_SET
);
669 // av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
671 assert(best_ast
->remaining
<= best_ast
->packet_size
);
673 avi
->stream_index
= best_stream_index
;
674 if(!best_ast
->remaining
)
675 best_ast
->packet_size
=
676 best_ast
->remaining
= best_st
->index_entries
[i
].size
;
681 if(avi
->stream_index
>= 0){
682 AVStream
*st
= s
->streams
[ avi
->stream_index
];
683 AVIStream
*ast
= st
->priv_data
;
686 if(ast
->sample_size
<= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
688 else if(ast
->sample_size
< 32)
689 size
= 64*ast
->sample_size
;
691 size
= ast
->sample_size
;
693 if(size
> ast
->remaining
)
694 size
= ast
->remaining
;
695 av_get_packet(pb
, pkt
, size
);
697 if(ast
->has_pal
&& pkt
->data
&& pkt
->size
<(unsigned)INT_MAX
/2){
700 pkt
->data
= av_realloc(pkt
->data
, pkt
->size
+ FF_INPUT_BUFFER_PADDING_SIZE
);
702 memcpy(pkt
->data
+ pkt
->size
- 4*256, ast
->pal
, 4*256);
705 if (ENABLE_DV_DEMUXER
&& avi
->dv_demux
) {
706 dstr
= pkt
->destruct
;
707 size
= dv_produce_packet(avi
->dv_demux
, pkt
,
708 pkt
->data
, pkt
->size
);
709 pkt
->destruct
= dstr
;
710 pkt
->flags
|= PKT_FLAG_KEY
;
712 /* XXX: How to handle B-frames in AVI? */
713 pkt
->dts
= ast
->frame_offset
;
714 // pkt->dts += ast->start;
716 pkt
->dts
/= ast
->sample_size
;
717 //av_log(NULL, 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);
718 pkt
->stream_index
= avi
->stream_index
;
720 if (st
->codec
->codec_type
== CODEC_TYPE_VIDEO
) {
723 assert(st
->index_entries
);
725 index
= av_index_search_timestamp(st
, pkt
->dts
, 0);
726 e
= &st
->index_entries
[index
];
728 if(index
>= 0 && e
->timestamp
== ast
->frame_offset
){
729 if (e
->flags
& AVINDEX_KEYFRAME
)
730 pkt
->flags
|= PKT_FLAG_KEY
;
733 pkt
->flags
|= PKT_FLAG_KEY
;
736 ast
->frame_offset
+= pkt
->size
;
740 ast
->remaining
-= size
;
742 avi
->stream_index
= -1;
749 memset(d
, -1, sizeof(int)*8);
750 for(i
=sync
=url_ftell(pb
); !url_feof(pb
); i
++) {
757 size
= d
[4] + (d
[5]<<8) + (d
[6]<<16) + (d
[7]<<24);
759 if( d
[2] >= '0' && d
[2] <= '9'
760 && d
[3] >= '0' && d
[3] <= '9'){
761 n
= (d
[2] - '0') * 10 + (d
[3] - '0');
763 n
= 100; //invalid stream id
765 //av_log(NULL, 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);
766 if(i
+ size
> avi
->fsize
|| d
[0]<0)
770 if( (d
[0] == 'i' && d
[1] == 'x' && n
< s
->nb_streams
)
772 ||(d
[0] == 'J' && d
[1] == 'U' && d
[2] == 'N' && d
[3] == 'K')
773 ||(d
[0] == 'i' && d
[1] == 'd' && d
[2] == 'x' && d
[3] == '1')){
775 //av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
779 if( d
[0] >= '0' && d
[0] <= '9'
780 && d
[1] >= '0' && d
[1] <= '9'){
781 n
= (d
[0] - '0') * 10 + (d
[1] - '0');
783 n
= 100; //invalid stream ID
787 if(n
< s
->nb_streams
){
793 if(s
->nb_streams
>=2){
794 AVStream
*st1
= s
->streams
[1];
795 AVIStream
*ast1
= st1
->priv_data
;
796 //workaround for broken small-file-bug402.avi
797 if( d
[2] == 'w' && d
[3] == 'b'
799 && st
->codec
->codec_type
== CODEC_TYPE_VIDEO
800 && st1
->codec
->codec_type
== CODEC_TYPE_AUDIO
801 && ast
->prefix
== 'd'*256+'c'
802 && (d
[2]*256+d
[3] == ast1
->prefix
|| !ast1
->prefix_count
)
807 av_log(s
, AV_LOG_WARNING
, "Invalid stream + prefix combination, assuming audio.\n");
812 if( (st
->discard
>= AVDISCARD_DEFAULT
&& size
==0)
813 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
814 || st
->discard
>= AVDISCARD_ALL
){
815 if(ast
->sample_size
) ast
->frame_offset
+= pkt
->size
;
816 else ast
->frame_offset
++;
821 if (d
[2] == 'p' && d
[3] == 'c' && size
<=4*256+4) {
822 int k
= get_byte(pb
);
823 int last
= (k
+ get_byte(pb
) - 1) & 0xFF;
825 get_le16(pb
); //flags
827 for (; k
<= last
; k
++)
828 ast
->pal
[k
] = get_be32(pb
)>>8;// b + (g << 8) + (r << 16);
831 } else if( ((ast
->prefix_count
<5 || sync
+9 > i
) && d
[2]<128 && d
[3]<128) ||
832 d
[2]*256+d
[3] == ast
->prefix
/*||
833 (d[2] == 'd' && d[3] == 'c') ||
834 (d[2] == 'w' && d[3] == 'b')*/) {
836 //av_log(NULL, AV_LOG_DEBUG, "OK\n");
837 if(d
[2]*256+d
[3] == ast
->prefix
)
840 ast
->prefix
= d
[2]*256+d
[3];
841 ast
->prefix_count
= 0;
844 avi
->stream_index
= n
;
845 ast
->packet_size
= size
+ 8;
846 ast
->remaining
= size
;
849 uint64_t pos
= url_ftell(pb
) - 8;
850 if(!st
->index_entries
|| !st
->nb_index_entries
|| st
->index_entries
[st
->nb_index_entries
- 1].pos
< pos
){
851 av_add_index_entry(st
, pos
, ast
->frame_offset
/ FFMAX(1, ast
->sample_size
), size
, 0, AVINDEX_KEYFRAME
);
862 /* XXX: We make the implicit supposition that the positions are sorted
864 static int avi_read_idx1(AVFormatContext
*s
, int size
)
866 AVIContext
*avi
= s
->priv_data
;
867 ByteIOContext
*pb
= s
->pb
;
868 int nb_index_entries
, i
;
871 unsigned int index
, tag
, flags
, pos
, len
;
872 unsigned last_pos
= -1;
874 nb_index_entries
= size
/ 16;
875 if (nb_index_entries
<= 0)
878 /* Read the entries and sort them in each stream component. */
879 for(i
= 0; i
< nb_index_entries
; i
++) {
881 flags
= get_le32(pb
);
884 #if defined(DEBUG_SEEK)
885 av_log(NULL
, AV_LOG_DEBUG
, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
886 i
, tag
, flags
, pos
, len
);
888 if(i
==0 && pos
> avi
->movi_list
)
889 avi
->movi_list
= 0; //FIXME better check
890 pos
+= avi
->movi_list
;
892 index
= ((tag
& 0xff) - '0') * 10;
893 index
+= ((tag
>> 8) & 0xff) - '0';
894 if (index
>= s
->nb_streams
)
896 st
= s
->streams
[index
];
899 #if defined(DEBUG_SEEK)
900 av_log(NULL
, AV_LOG_DEBUG
, "%d cum_len=%"PRId64
"\n", len
, ast
->cum_len
);
903 avi
->non_interleaved
= 1;
905 av_add_index_entry(st
, pos
, ast
->cum_len
/ FFMAX(1, ast
->sample_size
), len
, 0, (flags
&AVIIF_INDEX
) ? AVINDEX_KEYFRAME
: 0);
915 static int guess_ni_flag(AVFormatContext
*s
){
917 int64_t last_start
=0;
918 int64_t first_end
= INT64_MAX
;
920 for(i
=0; i
<s
->nb_streams
; i
++){
921 AVStream
*st
= s
->streams
[i
];
922 int n
= st
->nb_index_entries
;
927 if(st
->index_entries
[0].pos
> last_start
)
928 last_start
= st
->index_entries
[0].pos
;
929 if(st
->index_entries
[n
-1].pos
< first_end
)
930 first_end
= st
->index_entries
[n
-1].pos
;
932 return last_start
> first_end
;
935 static int avi_load_index(AVFormatContext
*s
)
937 AVIContext
*avi
= s
->priv_data
;
938 ByteIOContext
*pb
= s
->pb
;
940 offset_t pos
= url_ftell(pb
);
942 url_fseek(pb
, avi
->movi_end
, SEEK_SET
);
944 printf("movi_end=0x%"PRIx64
"\n", avi
->movi_end
);
952 printf("tag=%c%c%c%c size=0x%x\n",
960 case MKTAG('i', 'd', 'x', '1'):
961 if (avi_read_idx1(s
, size
) < 0)
974 url_fseek(pb
, pos
, SEEK_SET
);
978 static int avi_read_seek(AVFormatContext
*s
, int stream_index
, int64_t timestamp
, int flags
)
980 AVIContext
*avi
= s
->priv_data
;
985 if (!avi
->index_loaded
) {
986 /* we only load the index on demand */
988 avi
->index_loaded
= 1;
990 assert(stream_index
>= 0);
992 st
= s
->streams
[stream_index
];
993 index
= av_index_search_timestamp(st
, timestamp
, flags
);
997 /* find the position */
998 pos
= st
->index_entries
[index
].pos
;
999 timestamp
= st
->index_entries
[index
].timestamp
;
1001 // av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1003 if (ENABLE_DV_DEMUXER
&& avi
->dv_demux
) {
1004 /* One and only one real stream for DV in AVI, and it has video */
1005 /* offsets. Calling with other stream indexes should have failed */
1006 /* the av_index_search_timestamp call above. */
1007 assert(stream_index
== 0);
1009 /* Feed the DV video stream version of the timestamp to the */
1010 /* DV demux so it can synthesize correct timestamps. */
1011 dv_offset_reset(avi
->dv_demux
, timestamp
);
1013 url_fseek(s
->pb
, pos
, SEEK_SET
);
1014 avi
->stream_index
= -1;
1018 for(i
= 0; i
< s
->nb_streams
; i
++) {
1019 AVStream
*st2
= s
->streams
[i
];
1020 AVIStream
*ast2
= st2
->priv_data
;
1025 if (st2
->nb_index_entries
<= 0)
1028 // assert(st2->codec->block_align);
1029 assert((int64_t)st2
->time_base
.num
*ast2
->rate
== (int64_t)st2
->time_base
.den
*ast2
->scale
);
1030 index
= av_index_search_timestamp(
1032 av_rescale(timestamp
, st2
->time_base
.den
*(int64_t)st
->time_base
.num
, st
->time_base
.den
* (int64_t)st2
->time_base
.num
),
1033 flags
| AVSEEK_FLAG_BACKWARD
);
1037 if(!avi
->non_interleaved
){
1038 while(index
>0 && st2
->index_entries
[index
].pos
> pos
)
1040 while(index
+1 < st2
->nb_index_entries
&& st2
->index_entries
[index
].pos
< pos
)
1044 // av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1045 /* extract the current frame number */
1046 ast2
->frame_offset
= st2
->index_entries
[index
].timestamp
;
1047 if(ast2
->sample_size
)
1048 ast2
->frame_offset
*=ast2
->sample_size
;
1052 url_fseek(s
->pb
, pos
, SEEK_SET
);
1053 avi
->stream_index
= -1;
1057 static int avi_read_close(AVFormatContext
*s
)
1060 AVIContext
*avi
= s
->priv_data
;
1062 for(i
=0;i
<s
->nb_streams
;i
++) {
1063 AVStream
*st
= s
->streams
[i
];
1064 av_free(st
->codec
->palctrl
);
1068 av_free(avi
->dv_demux
);
1073 static int avi_probe(AVProbeData
*p
)
1077 /* check file header */
1078 for(i
=0; avi_headers
[i
][0]; i
++)
1079 if(!memcmp(p
->buf
, avi_headers
[i
] , 4) &&
1080 !memcmp(p
->buf
+8, avi_headers
[i
]+4, 4))
1081 return AVPROBE_SCORE_MAX
;
1086 AVInputFormat avi_demuxer
= {
1088 NULL_IF_CONFIG_SMALL("AVI format"),