mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/*
|
|
* audio conversion
|
|
* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file audioconvert.c
|
|
* audio conversion
|
|
* @author Michael Niedermayer <michaelni@gmx.at>
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
|
|
int av_audio_convert(void *maybe_dspcontext_or_something_av_convert_specific,
|
|
void *out[6], int out_stride[6], enum SampleFormat out_fmt,
|
|
void * in[6], int in_stride[6], enum SampleFormat in_fmt, int len){
|
|
int ch;
|
|
const int isize= FFMIN( in_fmt+1, 4);
|
|
const int osize= FFMIN(out_fmt+1, 4);
|
|
const int fmt_pair= out_fmt + 5*in_fmt;
|
|
|
|
//FIXME optimize common cases
|
|
|
|
for(ch=0; ch<6; ch++){
|
|
const int is= in_stride[ch] * isize;
|
|
const int os= out_stride[ch] * osize;
|
|
uint8_t *pi= in[ch];
|
|
uint8_t *po= out[ch];
|
|
uint8_t *end= po + os;
|
|
if(!out[ch])
|
|
continue;
|
|
|
|
#define CONV(ofmt, otype, ifmt, expr)\
|
|
if(fmt_pair == ofmt + 5*ifmt){\
|
|
do{\
|
|
*(otype*)po = expr; pi += is; po += os;\
|
|
}while(po < end);\
|
|
}
|
|
|
|
//FIXME put things below under ifdefs so we dont waste space for cases no codec will need
|
|
//FIXME rounding and cliping ?
|
|
|
|
CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 , *(uint8_t*)pi)
|
|
else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<8)
|
|
else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<24)
|
|
else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
|
|
else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(int16_t*)pi>>8) + 0x80)
|
|
else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16, *(int16_t*)pi)
|
|
else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16, *(int16_t*)pi<<16)
|
|
else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S16, *(int16_t*)pi*(1.0 / (1<<15)))
|
|
else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(int32_t*)pi>>24) + 0x80)
|
|
else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32, *(int32_t*)pi>>16)
|
|
else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32, *(int32_t*)pi)
|
|
else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S32, *(int32_t*)pi*(1.0 / (1<<31)))
|
|
else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<7)) + 0x80)
|
|
else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<15)))
|
|
else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<31)))
|
|
else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_FLT, *(float*)pi)
|
|
else return -1;
|
|
}
|
|
return 0;
|
|
}
|