81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
//=============================================================================
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// Audio Utility Library
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//
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// Copyright (C) 2002-2006 by Werner Schweer and others
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//=============================================================================
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#ifndef __DSP_H__
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#define __DSP_H__
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namespace Ms {
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//---------------------------------------------------------
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// f_max
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//---------------------------------------------------------
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static inline float f_max(float x, float a)
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{
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x -= a;
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x += fabsf(x);
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x *= 0.5f;
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x += a;
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return x;
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}
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//---------------------------------------------------------
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// Dsp
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// standard version of all dsp routines without any
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// hw acceleration
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//---------------------------------------------------------
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class Dsp {
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public:
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Dsp() {}
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virtual ~Dsp() {}
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virtual float peak(float* buf, unsigned n, float current) {
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for (unsigned i = 0; i < n; ++i)
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current = f_max(current, fabsf(buf[i]));
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return current;
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}
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virtual void applyGainToBuffer(float* buf, unsigned n, float gain) {
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for (unsigned i = 0; i < n; ++i)
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buf[i] *= gain;
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}
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virtual void mixWithGain(float* dst, float* src, unsigned n, float gain) {
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for (unsigned i = 0; i < n; ++i)
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dst[i] += src[i] * gain;
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}
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virtual void mix(float* dst, float* src, unsigned n) {
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for (unsigned i = 0; i < n; ++i)
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dst[i] += src[i];
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}
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virtual void cpy(float* dst, float* src, unsigned n) {
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#if defined(ARCH_X86) || defined(ARCH_X86_64)
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register unsigned long int dummy;
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__asm__ __volatile__ ("rep; movsl" :"=&D"(dst), "=&S"(src), "=&c"(dummy) :"0" (to), "1" (from),"2" (n) : "memory");
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#else
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memcpy(dst, src, sizeof(float) * n);
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#endif
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}
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};
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extern void initDsp();
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extern Dsp* dsp;
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} // namespace Ms
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#endif
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