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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _SndBuf_
#define _SndBuf_
#include <sys/types.h>
#include <sndfile.h>
struct SndBuf
{
double samplerate;
double sampledur; // = 1/ samplerate
float *data;
int channels;
int samples;
int frames;
int mask; // for delay lines
int mask1; // for interpolating oscillators.
int coord; // used by fft ugens
SNDFILE *sndfile; // used by disk i/o
};
typedef struct SndBuf SndBuf;
struct SndBufUpdates
{
int reads;
int writes;
};
typedef struct SndBufUpdates SndBufUpdates;
enum { coord_None, coord_Complex, coord_Polar };
inline float PhaseFrac(unsigned long inPhase)
{
union { unsigned long itemp; float ftemp; } u;
u.itemp = 0x3F800000 | (0x007FFF80 & ((inPhase)<<7));
return u.ftemp - 1.f;
}
inline float PhaseFrac1(unsigned long inPhase)
{
union { unsigned long itemp; float ftemp; } u;
u.itemp = 0x3F800000 | (0x007FFF80 & ((inPhase)<<7));
return u.ftemp;
}
inline float lookup(float *table, int32 phase, int32 mask)
{
return table[(phase >> 16) & mask];
}
#define xlobits 14
#define xlobits1 13
inline float lookupi(float *table, uint32 phase, uint32 mask)
{
float frac = PhaseFrac(phase);
float *tbl = table + ((phase >> 16) & mask);
float a = tbl[0];
float b = tbl[1];
return a + frac * (b - a);
}
inline float lookupi2(float *table, uint32 phase, uint32 mask)
{
float frac = PhaseFrac1(phase);
float *tbl = table + ((phase >> 16) & mask);
float a = tbl[0];
float b = tbl[1];
return a + frac * b;
}
inline float lookupi1(float* table0, float* table1, uint32 pphase, int32 lomask)
{
float pfrac = PhaseFrac1(pphase);
uint32 index = ((pphase >> xlobits1) & lomask);
float val1 = *(float*)((char*)table0 + index);
float val2 = *(float*)((char*)table1 + index);
return val1 + val2 * pfrac;
}
inline float lininterp(float x, float a, float b)
{
return a + x * (b - a);
}
#endif
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