1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
* Micronas SC-4 parser
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "parser.h"
typedef struct MISC4Context {
ParseContext pc;
} MISC4Context;
static int misc4_parse(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
MISC4Context *ctx = s->priv_data;
uint32_t state = ctx->pc.state;
int next = END_NOT_FOUND, i = 0;
*poutbuf_size = 0;
*poutbuf = NULL;
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
} else {
uint32_t marker = 0;
switch (avctx->sample_rate) {
case 8000:
case 11025:
marker = 0x11b;
break;
case 16000:
case 32000:
marker = 0x2b2;
break;
}
for (; i < buf_size; i++) {
state = (state << 8) | buf[i];
if (state == marker && i > 3) {
next = i - 3;
break;
}
}
ctx->pc.state = state;
if (ff_combine_frame(&ctx->pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
const AVCodecParser ff_misc4_parser = {
.codec_ids = { AV_CODEC_ID_MISC4 },
.priv_data_size = sizeof(MISC4Context),
.parser_parse = misc4_parse,
.parser_close = ff_parse_close,
};
|
