yading@10: /*
yading@10:  * audio conversion
yading@10:  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * audio conversion
yading@10:  * @author Michael Niedermayer <michaelni@gmx.at>
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/libm.h"
yading@10: #include "libavutil/samplefmt.h"
yading@10: #include "avcodec.h"
yading@10: #include "audioconvert.h"
yading@10: 
yading@10: struct AVAudioConvert {
yading@10:     int in_channels, out_channels;
yading@10:     int fmt_pair;
yading@10: };
yading@10: 
yading@10: AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels,
yading@10:                                        enum AVSampleFormat in_fmt, int in_channels,
yading@10:                                        const float *matrix, int flags)
yading@10: {
yading@10:     AVAudioConvert *ctx;
yading@10:     if (in_channels!=out_channels)
yading@10:         return NULL;  /* FIXME: not supported */
yading@10:     ctx = av_malloc(sizeof(AVAudioConvert));
yading@10:     if (!ctx)
yading@10:         return NULL;
yading@10:     ctx->in_channels = in_channels;
yading@10:     ctx->out_channels = out_channels;
yading@10:     ctx->fmt_pair = out_fmt + AV_SAMPLE_FMT_NB*in_fmt;
yading@10:     return ctx;
yading@10: }
yading@10: 
yading@10: void av_audio_convert_free(AVAudioConvert *ctx)
yading@10: {
yading@10:     av_free(ctx);
yading@10: }
yading@10: 
yading@10: int av_audio_convert(AVAudioConvert *ctx,
yading@10:                            void * const out[6], const int out_stride[6],
yading@10:                      const void * const  in[6], const int  in_stride[6], int len)
yading@10: {
yading@10:     int ch;
yading@10: 
yading@10:     //FIXME optimize common cases
yading@10: 
yading@10:     for(ch=0; ch<ctx->out_channels; ch++){
yading@10:         const int is=  in_stride[ch];
yading@10:         const int os= out_stride[ch];
yading@10:         const uint8_t *pi=  in[ch];
yading@10:         uint8_t *po= out[ch];
yading@10:         uint8_t *end= po + os*len;
yading@10:         if(!out[ch])
yading@10:             continue;
yading@10: 
yading@10: #define CONV(ofmt, otype, ifmt, expr)\
yading@10: if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\
yading@10:     do{\
yading@10:         *(otype*)po = expr; pi += is; po += os;\
yading@10:     }while(po < end);\
yading@10: }
yading@10: 
yading@10: //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
yading@10: //FIXME rounding ?
yading@10: 
yading@10:              CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 ,  *(const uint8_t*)pi)
yading@10:         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
yading@10:         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
yading@10:         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
yading@10:         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
yading@10:         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
yading@10:         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16,  *(const int16_t*)pi)
yading@10:         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16,  *(const int16_t*)pi<<16)
yading@10:         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
yading@10:         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
yading@10:         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
yading@10:         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32,  *(const int32_t*)pi>>16)
yading@10:         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32,  *(const int32_t*)pi)
yading@10:         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1U<<31)))
yading@10:         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1U<<31)))
yading@10:         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(  lrintf(*(const float*)pi * (1<<7)) + 0x80))
yading@10:         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(  lrintf(*(const float*)pi * (1<<15))))
yading@10:         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31))))
yading@10:         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_FLT, *(const float*)pi)
yading@10:         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi)
yading@10:         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(  lrint(*(const double*)pi * (1<<7)) + 0x80))
yading@10:         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(  lrint(*(const double*)pi * (1<<15))))
yading@10:         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31))))
yading@10:         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_DBL, *(const double*)pi)
yading@10:         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi)
yading@10:         else return -1;
yading@10:     }
yading@10:     return 0;
yading@10: }