yading@10: /*
yading@10:  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Cook audio parser
yading@10:  *
yading@10:  * Determines subpacket duration from extradata.
yading@10:  */
yading@10: 
yading@10: #include <stdint.h>
yading@10: 
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "parser.h"
yading@10: 
yading@10: typedef struct CookParseContext {
yading@10:     int duration;
yading@10: } CookParseContext;
yading@10: 
yading@10: static int cook_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
yading@10:                       const uint8_t **poutbuf, int *poutbuf_size,
yading@10:                       const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     CookParseContext *s = s1->priv_data;
yading@10: 
yading@10:     if (s->duration)
yading@10:         s1->duration = s->duration;
yading@10:     else if (avctx->extradata && avctx->extradata_size >= 8 && avctx->channels)
yading@10:         s->duration = AV_RB16(avctx->extradata + 4) / avctx->channels;
yading@10: 
yading@10:     /* always return the full packet. this parser isn't doing any splitting or
yading@10:        combining, only setting packet duration */
yading@10:     *poutbuf      = buf;
yading@10:     *poutbuf_size = buf_size;
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodecParser ff_cook_parser = {
yading@10:     .codec_ids      = { AV_CODEC_ID_COOK },
yading@10:     .priv_data_size = sizeof(CookParseContext),
yading@10:     .parser_parse   = cook_parse,
yading@10: };