workbench/classes/datatypes/wav/decoders.c

   1 /*
   2  *      wave.datatype
   3  *      (c) Fredrik Wikstrom
   4  */
   5
   6 #include "wave_class.h"
   7 #include "decoders.h"
   8
   9 #include "wave_pcm.h"
  10 #include "wave_ima_adpcm.h"
  11 #include "wave_ms_adpcm.h"
  12 #include "wave_alaw.h"
  13 #include "wave_ieee_float.h"
  14 #include "wave_gsm610.h"
  15 #include "wave_g72x.h"
  16
  17 DECODERPROTO(DecodeBlocks);
  18
  19 static struct Decoder all_decoders[] = {
  20         { WAVE_FORMAT_PCM,                      0,      SetupPCM,                       NULL,                   DecodePCM,                      NULL                    },
  21         { WAVE_FORMAT_IMA_ADPCM,        0,      SetupIMA_ADPCM,         NULL,                   DecodeBlocks,           DecodeIMA_ADPCM },
  22         { WAVE_FORMAT_ADPCM,            0,      SetupMS_ADPCM,          NULL,                   DecodeBlocks,           DecodeMS_ADPCM  },
  23         { WAVE_FORMAT_IEEE_FLOAT,       0,      SetupIEEE_Float,        NULL,                   NULL,                           NULL                    },
  24         { WAVE_FORMAT_ALAW,                     0,      SetupALaw,                      NULL,                   DecodeALaw,                     NULL                    },
  25         { WAVE_FORMAT_MULAW,            0,      SetupALaw,                      NULL,                   DecodeMuLaw,            NULL                    },
  26         #ifdef GSM610_SUPPORT
  27         { WAVE_FORMAT_GSM610,           0,      SetupGSM610,            CleanupGSM610,  DecodeBlocks,           DecodeGSM610    },
  28         #endif
  29         #ifdef G72X_SUPPORT
  30         { WAVE_FORMAT_G721_ADPCM,       0,      SetupG72x,                      NULL,                   DecodeBlocks,           DecodeG72x              },
  31         { WAVE_FORMAT_G723_ADPCM,       0,      SetupG72x,                      NULL,                   DecodeBlocks,           DecodeG72x              },
  32         #endif
  33         { 0 }
  34 };
  35
  36 struct Decoder * GetDecoder (UWORD fmtTag) {
  37         struct Decoder *dec;
  38         for (dec = all_decoders; dec->formatTag; dec++) {
  39                 if (dec->formatTag == fmtTag)
  40                         return dec;
  41         }
  42         return NULL;
  43 }
  44
  45 DECODERPROTO(DecodeBlocks) {
  46         LONG status;
  47         LONG frames_left;
  48         LONG frames;
  49         LONG blocksize;
  50
  51         frames_left = numFrames;
  52         frames = data->blockFrames;
  53         blocksize = fmt->blockAlign;
  54         while (frames_left > 0) {
  55                 if (frames_left < frames) frames = frames_left;
  56
  57                 status = data->DecodeFrames(data, fmt, Src, Dst, 1, frames);
  58                 if (status != frames) {
  59                         return numFrames-frames_left+status;
  60                 }
  61                 Src += blocksize;
  62
  63                 frames_left -= frames;
  64         }
  65         return numFrames;
  66 }