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dvaudio_parser.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * Ulead DV audio parser
22  *
23  * Determines the duration for each packet.
24  */
25 
26 #include "parser.h"
27 #include "dvaudio.h"
28 
30  const uint8_t **poutbuf, int *poutbuf_size,
31  const uint8_t *buf, int buf_size)
32 {
33  if (buf_size >= 248)
34  s1->duration = dv_get_audio_sample_count(buf + 244, avctx->block_align == 8640);
35 
36  /* always return the full packet. this parser isn't doing any splitting or
37  combining, only packet analysis */
38  *poutbuf = buf;
39  *poutbuf_size = buf_size;
40  return buf_size;
41 }
42 
45  .parser_parse = dvaudio_parse,
46 };
int codec_ids[5]
Definition: avcodec.h:5083
int duration
Duration of the current frame.
Definition: avcodec.h:5037
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2180
uint8_t
AVCodecParser ff_dvaudio_parser
main external API structure.
Definition: avcodec.h:1488
void * buf
Definition: avisynth_c.h:690
#define s1
Definition: regdef.h:38
static int dv_get_audio_sample_count(const uint8_t *buffer, int dsf)
Definition: dvaudio.h:24
static int dvaudio_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)