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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; | |
35 | } CookParseContext; | |
36 | ||
37 | static int cook_parse(AVCodecParserContext *s1, AVCodecContext *avctx, | |
38 | const uint8_t **poutbuf, int *poutbuf_size, | |
39 | const uint8_t *buf, int buf_size) | |
40 | { | |
41 | CookParseContext *s = s1->priv_data; | |
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 | ||
56 | AVCodecParser ff_cook_parser = { | |
57 | .codec_ids = { AV_CODEC_ID_COOK }, | |
58 | .priv_data_size = sizeof(CookParseContext), | |
59 | .parser_parse = cook_parse, | |
60 | }; |