workbench/classes/datatypes/wav/wave_ieee_float.c

   1 /*
   2  *      wave.datatype
   3  *      (c) Fredrik Wikstrom
   4  */
   5
   6 #include "wave_ieee_float.h"
   7
   8 DEC_SETUPPROTO(SetupIEEE_Float) {
   9         struct WaveFormatEx * fmt;
  10         fmt = data->fmt;
  11         if (fmt->extraSize != 0)
  12                 return NOTOK;
  13         switch (fmt->bitsPerSample) {
  14                 case 32:
  15                         data->Decode = DecodeIEEE_Float_32;
  16                         break;
  17                 case 64:
  18                         data->Decode = DecodeIEEE_Float_64;
  19                         break;
  20                 default:
  21                         data->Decode = NULL;
  22                         return DTERROR_UNKNOWN_COMPRESSION;
  23         }
  24         data->blockFrames = 1;
  25         return OK;
  26 }
  27
  28 DECODERPROTO(DecodeIEEE_Float_32) {
  29         LONG frame,chan;
  30         for (frame=0;frame<numFrames;frame++) {
  31                 for (chan=0;chan<fmt->numChannels;chan++) {
  32                         union {
  33                                 FLOAT f;
  34                                 ULONG i;
  35                         } samp;
  36                         samp.i = read_le32(Src); Src += 4;
  37                         *Dst[chan]++ = (BYTE)(samp.f * 127.0);
  38                 }
  39         }
  40         return numFrames;
  41 }
  42
  43 DECODERPROTO(DecodeIEEE_Float_64) {
  44         LONG frame,chan;
  45         for (frame=0;frame<numFrames;frame++) {
  46                 for (chan=0;chan<fmt->numChannels;chan++) {
  47                         union {
  48                                 DOUBLE f;
  49                                 UQUAD i;
  50                         } samp;
  51                         samp.i = read_le64(Src); Src += 8;
  52                         *Dst[chan]++ = (BYTE)(samp.f * 127.0);
  53                 }
  54         }
  55         return numFrames;
  56 }