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//=============================================================================
// AL
// Audio Utility Library
// $Id:$
//
// Copyright (C) 2002-2006 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 version 2.
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//=============================================================================
#ifndef __DSP_H__
#define __DSP_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) {
#if defined(ARCH_X86) || defined(ARCH_X86_64)
register unsinged long int dummy;
__asm__ __volatile__ "rep; movsl" :"=&D"(dst), "=&S"(src), "=&c"(dummy) :"0" (to), "1" (from),"2" (n) : "memory");
#else
memcpy(dst, src, sizeof(float) * n);
#endif
}
};
extern void initDsp();
extern Dsp* dsp;
}
#endif
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