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cook_parser.c
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1 /*
2  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * Cook audio parser
24  *
25  * Determines subpacket duration from extradata.
26  */
27 
28 #include <stdint.h>
29 
30 #include "libavutil/intreadwrite.h"
31 #include "parser.h"
32 
33 typedef struct CookParseContext {
34  int duration;
36 
38  const uint8_t **poutbuf, int *poutbuf_size,
39  const uint8_t *buf, int buf_size)
40 {
42 
43  if (!s->duration &&
44  avctx->extradata && avctx->extradata_size >= 8 && avctx->channels)
45  s->duration = AV_RB16(avctx->extradata + 4) / avctx->channels;
46 
47  s1->duration = s->duration;
48 
49  /* always return the full packet. this parser isn't doing any splitting or
50  combining, only setting packet duration */
51  *poutbuf = buf;
52  *poutbuf_size = buf_size;
53  return buf_size;
54 }
55 
58  .priv_data_size = sizeof(CookParseContext),
59  .parser_parse = cook_parse,
60 };
const char * s
Definition: avisynth_c.h:768
int codec_ids[5]
Definition: avcodec.h:5150
int duration
Duration of the current frame.
Definition: avcodec.h:5104
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
uint8_t
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1791
static int cook_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: cook_parser.c:37
AVCodecParser ff_cook_parser
Definition: cook_parser.c:56
main external API structure.
Definition: avcodec.h:1676
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1792
#define s1
Definition: regdef.h:38
int channels
number of audio channels
Definition: avcodec.h:2439