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  1. /*
  2.  * audio conversion
  3.  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * audio conversion
  25.  * @author Michael Niedermayer <michaelni@gmx.at>
  26.  */
  27.  
  28. #include "libavutil/avstring.h"
  29. #include "libavutil/common.h"
  30. #include "libavutil/libm.h"
  31. #include "libavutil/samplefmt.h"
  32. #include "avcodec.h"
  33. #include "audioconvert.h"
  34.  
  35. struct AVAudioConvert {
  36.     int in_channels, out_channels;
  37.     int fmt_pair;
  38. };
  39.  
  40. AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels,
  41.                                        enum AVSampleFormat in_fmt, int in_channels,
  42.                                        const float *matrix, int flags)
  43. {
  44.     AVAudioConvert *ctx;
  45.     if (in_channels!=out_channels)
  46.         return NULL;  /* FIXME: not supported */
  47.     ctx = av_malloc(sizeof(AVAudioConvert));
  48.     if (!ctx)
  49.         return NULL;
  50.     ctx->in_channels = in_channels;
  51.     ctx->out_channels = out_channels;
  52.     ctx->fmt_pair = out_fmt + AV_SAMPLE_FMT_NB*in_fmt;
  53.     return ctx;
  54. }
  55.  
  56. void av_audio_convert_free(AVAudioConvert *ctx)
  57. {
  58.     av_free(ctx);
  59. }
  60.  
  61. int av_audio_convert(AVAudioConvert *ctx,
  62.                            void * const out[6], const int out_stride[6],
  63.                      const void * const  in[6], const int  in_stride[6], int len)
  64. {
  65.     int ch;
  66.  
  67.     //FIXME optimize common cases
  68.  
  69.     for(ch=0; ch<ctx->out_channels; ch++){
  70.         const int is=  in_stride[ch];
  71.         const int os= out_stride[ch];
  72.         const uint8_t *pi=  in[ch];
  73.         uint8_t *po= out[ch];
  74.         uint8_t *end= po + os*len;
  75.         if(!out[ch])
  76.             continue;
  77.  
  78. #define CONV(ofmt, otype, ifmt, expr)\
  79. if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\
  80.     do{\
  81.         *(otype*)po = expr; pi += is; po += os;\
  82.     }while(po < end);\
  83. }
  84.  
  85. //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
  86. //FIXME rounding ?
  87.  
  88.              CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 ,  *(const uint8_t*)pi)
  89.         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
  90.         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
  91.         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
  92.         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
  93.         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
  94.         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16,  *(const int16_t*)pi)
  95.         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16,  *(const int16_t*)pi<<16)
  96.         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
  97.         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
  98.         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
  99.         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32,  *(const int32_t*)pi>>16)
  100.         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32,  *(const int32_t*)pi)
  101.         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1U<<31)))
  102.         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1U<<31)))
  103.         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(  lrintf(*(const float*)pi * (1<<7)) + 0x80))
  104.         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(  lrintf(*(const float*)pi * (1<<15))))
  105.         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31))))
  106.         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_FLT, *(const float*)pi)
  107.         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi)
  108.         else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(  lrint(*(const double*)pi * (1<<7)) + 0x80))
  109.         else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(  lrint(*(const double*)pi * (1<<15))))
  110.         else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31))))
  111.         else CONV(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_DBL, *(const double*)pi)
  112.         else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi)
  113.         else return -1;
  114.     }
  115.     return 0;
  116. }
  117.