Diff: SoundWaveGenerator/WaveCombo.cpp

Revision:

0:1324e7d9d471

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SoundWaveGenerator/WaveCombo.cpp	Mon Mar 07 22:51:19 2011 +0000
@@ -0,0 +1,40 @@
+#include "snd_wave_generator/WaveCombo.h"
+
+#include <algorithm>
+#include <functional>
+#include <numeric>
+
+namespace snd_wave_generator {
+
+WaveCombo & WaveCombo::add(Wave *wave) { 
+    if (wave) { 
+        this->waves.push_back(wave);
+        this->numWaves = this->waves.size(); 
+    }
+    
+    return *this;
+}
+
+void WaveCombo::prepare(std::size_t sampleRate)
+{
+    std::for_each(this->waves.begin(), this->waves.end(),
+        std::bind2nd(std::mem_fun(&Wave::prepare), sampleRate));
+}
+
+struct AccumulateWaveValueAt {
+    AccumulateWaveValueAt(std::size_t pos) : pos(pos) { }
+    float operator()(float acc, const Wave *wave) const {
+        return acc + wave->read(this->pos);
+    }
+    
+    std::size_t pos;
+};
+
+float WaveCombo::read(std::size_t pos) const {
+    float v = std::accumulate(this->waves.begin(), this->waves.end(), 0.0f,
+        AccumulateWaveValueAt(pos));
+                
+    return v / this->numWaves;
+}
+
+} // snd_wave_generator
\ No newline at end of file