eris_mixer_ext.h

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#include "Arduino.h"
#include "AudioStream.h"
 
#if defined(__ARM_ARCH_7EM__)
#ifndef _erisMIXERext
#define _erisMIXERext
class AudioMixer8 : public AudioStream{
public:
    AudioMixer8(void) : AudioStream(8, inputQueueArray) {
        for (int i=0; i<8; i++) multiplier[i] = 65536;
    }
    virtual void update(void);
    void gain(unsigned int channel, float gain) {
        if (channel >= 8) return;
        if (gain > 32767.0f) gain = 32767.0f;
        else if (gain < -32767.0f) gain = -32767.0f;
        multiplier[channel] = gain * 65536.0f; // TODO: proper roundoff?
    }
private:
    int32_t multiplier[8];
    audio_block_t *inputQueueArray[8];
};
#endif
#endif