aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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
*/
/**
* @file
* Sipr audio parser
*/
#include "parser.h"
typedef struct SiprParserContext{
ParseContext pc;
} SiprParserContext;
static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
{
int next;
switch (avctx->block_align) {
case 20:
case 19:
case 29:
case 37: next = avctx->block_align; break;
default:
if (avctx->bit_rate > 12200) next = 20;
else if (avctx->bit_rate > 7500 ) next = 19;
else if (avctx->bit_rate > 5750 ) next = 29;
else next = 37;
}
return FFMIN(next, buf_size);
}
static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
SiprParserContext *s = s1->priv_data;
ParseContext *pc = &s->pc;
int next;
next = sipr_split(avctx, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
AVCodecParser ff_sipr_parser = {
.codec_ids = { AV_CODEC_ID_SIPR },
.priv_data_size = sizeof(SiprParserContext),
.parser_parse = sipr_parse,
.parser_close = ff_parse_close,
};
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