mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
|
|
* 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,
|
|
};
|