adpcm.h

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#ifndef __MT_ADPCM__
#define __MT_ADPCM__

#include <exec/types.h>
#define SWAP(x) x
#define SWAPW(x) x
#define attrib(x)

#define MAKE_ID(a,b,c,d)  SWAP((  (a)<<24 |  (b)<<16 | (c)<<8 | (d) ))


static int Matrix[3][8] =
{
    {0x3800, 0x5600, 0, 0, 0, 0, 0, 0},
    {0x399a, 0x3a9f, 0x4d14, 0x6607, 0, 0, 0, 0},
    {0x3556, 0x3556, 0x399A, 0x3A9F, 0x4200, 0x4D14, 0x6607, 0x6607},
};

static int bitmask[9] =
{
    0, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff
};

// struct ADPCMHeader
// {
//  UBYTE Identifier[6];
//  ULONG Frequency;
// }; // attrib(packed);

// struct Voice8Header {
//     ULONG oneShotHiSamples, /* # samples in the high octave 1-shot part */
//           repeatHiSamples,  /* # samples in the high octave repeat part */
//           samplesPerHiCycle;/* # samples/cycle in high octave, else 0   */
//     UWORD samplesPerSec;    /* data sampling rate                       */
//     UBYTE ctOctave,         /* # octaves of waveforms                   */
//           sCompression;     /* data compression technique used          */
//     LONG volume;           /* playback volume from 0 to Unity (full
//                              * volume). Map this value into the output
//                              * hardware's dynamic range.                */
// }; // attrib(packed) attrib(packed);

// struct SVXHeader
// {
//  ULONG FORM;
//  ULONG fSize;
//  ULONG SVX, VHDR;
//  ULONG vSize;
//  struct Voice8Header v8h;
//  ULONG ANNO;
//  ULONG aSize;
//  UBYTE aData[20];
//  ULONG BODY;
//  ULONG bSize;
// }; // attrib(packed) attrib(packed);

// struct WAVHeaderFmt
// {
//  UWORD   AudioFormat;
//  UWORD   NumOfChan;
//  ULONG   SamplesPerSec;
//  ULONG   bytesPerSec;
//  UWORD   blockAlign;
//  UWORD   bitsPerSample;
// }; // attrib(packed) attrib(packed);

// struct WAVHeader
// {
//  ULONG   RIFF;
//  ULONG   ChunkSize;
//  ULONG   WAVE;
//  ULONG   fmt;
//  ULONG   Subchunk1Size;
//  struct WAVHeaderFmt whf;
//  ULONG   Subchunk2ID;
//  ULONG   Subchunk2Size;
// }; // attrib(packed) attrib(packed); 

#endif /* __MT_ADPCM__ */