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//=============================================================================
// AL
// Audio Utility Library
// $Id: dsp.h,v 1.1.2.1 2009/12/06 01:39:33 terminator356 Exp $
//
// Copyright (C) 1999-2011 by Werner Schweer and others
//
// 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; 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//=============================================================================
#ifndef __DSP_H__
#define __DSP_H__
#include <string.h>
#include <math.h>
namespace AL {
//---------------------------------------------------------
// f_max
//---------------------------------------------------------
static inline float f_max(float x, float a)
{
x -= a;
x += fabsf(x);
x *= 0.5f;
x += a;
return x;
}
//---------------------------------------------------------
// Dsp
// standard version of all dsp routines without any
// hw acceleration
//---------------------------------------------------------
class Dsp {
public:
Dsp() {}
virtual ~Dsp() {}
virtual float peak(float* buf, unsigned n, float current) {
for (unsigned i = 0; i < n; ++i)
current = f_max(current, fabsf(buf[i]));
return current;
}
virtual void applyGainToBuffer(float* buf, unsigned n, float gain) {
for (unsigned i = 0; i < n; ++i)
buf[i] *= gain;
}
virtual void mixWithGain(float* dst, float* src, unsigned n, float gain) {
for (unsigned i = 0; i < n; ++i)
dst[i] += src[i] * gain;
}
virtual void mix(float* dst, float* src, unsigned n) {
for (unsigned i = 0; i < n; ++i)
dst[i] += src[i];
}
virtual void cpy(float* dst, float* src, unsigned n);
/*
{
// Changed by T356. Not defined. Where are these???
//#if defined(ARCH_X86) || defined(ARCH_X86_64)
#if defined(__i386__) || defined(__x86_64__)
printf("Dsp: using asm cpy\n");
// Changed by T356. Get To and From not declared in scope compile errors.
register unsigned long int dummy;
//__asm__ __volatile__ ("rep; movsl" :"=&D"(dst), "=&S"(src), "=&c"(dummy) :"0" (to), "1" (from),"2" (n) : "memory");
// From http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html
__asm__ __volatile__ ( \
"cld\n\t" \
"rep\n\t" \
"movsl" \
: \
: "S" (src), "D" (dst), "c" (n) \
: "memory"
);
//: "%ecx", "%esi", "%edi", "memory"
#else
printf("Dsp: using memcpy\n");
memcpy(dst, src, sizeof(float) * n);
#endif
}
*/
};
extern void initDsp();
extern void exitDsp();
extern Dsp* dsp;
}
#endif
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