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sipr_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  * Sipr audio parser
22  */
23 
24 #include "parser.h"
25 
26 typedef struct SiprParserContext{
29 
30 static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
31 {
32  int next;
33 
34  switch (avctx->block_align) {
35  case 20:
36  case 19:
37  case 29:
38  case 37: next = avctx->block_align; break;
39  default:
40  if (avctx->bit_rate > 12200) next = 20;
41  else if (avctx->bit_rate > 7500 ) next = 19;
42  else if (avctx->bit_rate > 5750 ) next = 29;
43  else next = 37;
44  }
45 
46  return FFMIN(next, buf_size);
47 }
48 
50  const uint8_t **poutbuf, int *poutbuf_size,
51  const uint8_t *buf, int buf_size)
52 {
54  ParseContext *pc = &s->pc;
55  int next;
56 
57  next = sipr_split(avctx, buf, buf_size);
58  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
59  *poutbuf = NULL;
60  *poutbuf_size = 0;
61  return buf_size;
62  }
63 
64  *poutbuf = buf;
65  *poutbuf_size = buf_size;
66  return next;
67 }
68 
71  .priv_data_size = sizeof(SiprParserContext),
72  .parser_parse = sipr_parse,
73  .parser_close = ff_parse_close,
74 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1538
int codec_ids[5]
Definition: avcodec.h:5083
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_sipr_parser
Definition: sipr_parser.c:69
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:251
static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: sipr_parser.c:30
void ff_parse_close(AVCodecParserContext *s)
Definition: parser.c:329
#define FFMIN(a, b)
Definition: common.h:96
main external API structure.
Definition: avcodec.h:1488
void * buf
Definition: avisynth_c.h:690
ParseContext pc
Definition: sipr_parser.c:27
#define s1
Definition: regdef.h:38
static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: sipr_parser.c:49