| 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 | }; |