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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
+