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
33typedef struct CookParseContext {
34    int duration;
35} CookParseContext;
36
37static 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->ch_layout.nb_channels)
45        s->duration = AV_RB16(avctx->extradata + 4) / avctx->ch_layout.nb_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
56const AVCodecParser ff_cook_parser = {
57    .codec_ids      = { AV_CODEC_ID_COOK },
58    .priv_data_size = sizeof(CookParseContext),
59    .parser_parse   = cook_parse,
60};
61