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8svx.h
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C/C++ Source or Header
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1990-02-14
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2KB
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70 lines
/* 8svx.h include file for IFF 8-bit sampled voices
* essentially cribbed from EA IFF documentation
* KEL 21-Feb-87
*/
#ifndef I8SVX_H
#define I8SVX_H
#define ID_8SVX MakeID('8', 'S', 'V', 'X')
#define ID_VHDR MakeID('V', 'H', 'D', 'R')
typedef LONG Fixed; /* A fixed-point value, 16 bits to the left of the
* point and 16 to the right. A Fixed is a number
* of 216ths, i.e. 65536ths. */
#define Unity 0x1000L /* Unity = Fixed 1.0 = maximum volume */
/* sCompression: Choice of compression algorithm applied to the samples */
#define sCmpNone 0 /* not compressed */
#define sCmpFibDelta 1 /* Fibonacci-delta encoding */
/* can be more kinds in the future */
typedef struct {
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 */
Fixed volume; /* playback volume from 0 to Unity (full
* volume). Map this value into the output
* hardware's dynamic range. */
} Voice8Header;
#define ID_NAME MakeID('N', 'A', 'M', 'E')
/* NAME chunk contains a CHAR [], the voice's name. */
#define ID_Copyright MakeID('(','c',')',' ')
/* "(c) " chunk contains a CHAR [], the FORM's copyright notice. */
#ifndef ID_AUTH
#define ID_AUTH MakeID('A','U','T','H')
#endif
/* AUTH chunk contains a CHAR [], the author's name. */
#define ID_ANNO MakeID('A', 'N', 'N', 'O')
/* ANNO chunk contains a CHAR [], author's text annotations. */
#define ID_ATAK MakeID('A', 'T', 'A', 'K')
#define ID_RLSE MakeID('R', 'L', 'S', 'E')
typedef struct {
UWORD duration; /* segment duration in milliseconds, > 0 */
Fixed dest; /* destination volume factor */
} EGPoint;
/* ATAK and RLSE chunks contain an EGPoint[] piecewise-linear envelope. */
/* The envelope defines a function of time returning Fixed values. It's
* used to scale the nominal volume specified in the Voice8Header. */
#define ID_BODY MakeID('B', 'O', 'D', 'Y')
/* BODY chunk contains a BYTE[], array of audio data samples. */
#endif
/* end of 8svx.h */