/* * 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; }