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8svx.h
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C/C++ Source or Header
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1990-03-11
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4KB
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97 lines
/*----------------------------------------------------------------------*
* 8SVX.H Definitions for 8-bit sampled voice (VOX). 2/10/86
*
* By Jerry Morrison and Steve Hayes, Electronic Arts.
* This software is in the public domain.
*
* This version for the Commodore-Amiga computer.
*----------------------------------------------------------------------*/
#ifndef EIGHTSVX_H
#define EIGHTSVX_H
#ifndef COMPILER_H
#include "iff/compiler.h"
#endif
#include "iff/iff.h"
#define ID_8SVX MakeID('8', 'S', 'V', 'X')
#define ID_VHDR MakeID('V', 'H', 'D', 'R')
#define ID_NAME MakeID('N', 'A', 'M', 'E')
#define ID_Copyright MakeID('(', 'c', ')', ' ')
#define ID_AUTH MakeID('A', 'U', 'T', 'H')
#define ID_ANNO MakeID('A', 'N', 'N', 'O')
#define ID_BODY MakeID('B', 'O', 'D', 'Y')
#define ID_ATAK MakeID('A', 'T', 'A', 'K')
#define ID_RLSE MakeID('R', 'L', 'S', 'E')
/* ---------- Voice8Header ---------------------------------------------*/
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 2**16ths, i.e. 65536ths. */
#define Unity 0x10000L /* 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 (Appendix C) */
/* Could 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, /* # of octaves of waveforms */
sCompression; /* data compression technique used */
Fixed volume; /* playback nominal volume from 0 to Unity
* (full volume). Map this value into
* the output hardware's dynamic range.
*/
} Voice8Header;
/* ---------- NAME -----------------------------------------------------*/
/* NAME chunk contains a CHAR[], the voice's name. */
/* ---------- Copyright ------------------------------------------------*/
/* "(c) " chunk contains a CHAR[], the FORM's copyright notice. */
/* ---------- AUTH -----------------------------------------------------*/
/* AUTH chunk contains a CHAR[], the author's name. */
/* ---------- ANNO -----------------------------------------------------*/
/* ANNO chunk contains a CHAR[], the author's text annotations. */
/* ---------- Envelope ATAK & RLSE -------------------------------------*/
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.
*/
/* ---------- BODY -----------------------------------------------------*/
/* BODY chunk contains a BYTE[], array of audio data samples. */
/* (8-bit signed numbers, -128 through 127.) */
/* ---------- 8SVX Reader Support Routines -----------------------------*/
/* Just call this macro to read a VHDR chunk. */
#define GetVHDR(context, vHdr) \
IFFReadBytes(context, (BYTE *)vHdr, sizeof(Voice8Header))
/* ---------- 8SVX Writer Support Routines -----------------------------*/
/* Just call this macro to write a VHDR chunk. */
#define PutVHDR(context, vHdr) \
PutCk(context, ID_VHDR, sizeof(Voice8Header), (BYTE *)vHdr)
#endif