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ffmpeg / libavcodec / audioconvert.c @ 0eb6817d

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/*
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 * audio conversation
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 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
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/**
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 * @file audioconvert.c
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 * audio conversation
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 * @author Michael Niedermayer <michaelni@gmx.at>
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 */
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#include "avcodec.h"
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int av_audio_convert(void *maybe_dspcontext_or_something_av_convert_specific,
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                     void *out[6], int out_stride[6], enum SampleFormat out_fmt,
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                     void * in[6], int  in_stride[6], enum SampleFormat  in_fmt, int len){
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    int ch;
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    const int isize= FFMIN( in_fmt+1, 4);
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    const int osize= FFMIN(out_fmt+1, 4);
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    const int fmt_pair= out_fmt + 5*in_fmt;
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    //FIXME optimize common cases
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    for(ch=0; ch<6; ch++){
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        const int is=  in_stride[ch] * isize;
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        const int os= out_stride[ch] * osize;
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        uint8_t *pi=  in[ch];
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        uint8_t *po= out[ch];
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        uint8_t *end= po + os;
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        if(!out[ch])
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            continue;
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#define CONV(ofmt, otype, ifmt, expr)\
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if(fmt_pair == ofmt + 5*ifmt){\
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    do{\
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        *(otype*)po = expr; pi += is; po += os;\
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    }while(po < end);\
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}
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//FIXME put things below under ifdefs so we dont waste space for cases no codec will need
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//FIXME rounding and cliping ?
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             CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 ,  *(uint8_t*)pi)
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        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<8)
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        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<24)
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        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
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        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(int16_t*)pi>>8) + 0x80)
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        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16,  *(int16_t*)pi)
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        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16,  *(int16_t*)pi<<16)
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        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_S16,  *(int16_t*)pi*(1.0 / (1<<15)))
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        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(int32_t*)pi>>24) + 0x80)
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        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32,  *(int32_t*)pi>>16)
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        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32,  *(int32_t*)pi)
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        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_S32,  *(int32_t*)pi*(1.0 / (1<<31)))
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        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<7)) + 0x80)
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        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<15)))
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        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<31)))
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        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_FLT, *(float*)pi)
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        else return -1;
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    }
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    return 0;
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}