|
|
|
@ -1,22 +1,31 @@ |
|
|
|
|
/*
|
|
|
|
|
* AudioMixer4 |
|
|
|
|
*
|
|
|
|
|
* Created: Patrick Radius, December 2016 |
|
|
|
|
* Purpose: Mix up to 4 audio channels with individual gain controls. |
|
|
|
|
* Assumes floating-point data. |
|
|
|
|
*
|
|
|
|
|
* This processes a single stream fo audio data (ie, it is mono)
|
|
|
|
|
*
|
|
|
|
|
* MIT License. use at your own risk. |
|
|
|
|
*/ |
|
|
|
|
|
|
|
|
|
#ifndef AUDIOMIXER4F32_H |
|
|
|
|
#define AUDIOMIXER4F32_H |
|
|
|
|
|
|
|
|
|
#include <arm_math.h> |
|
|
|
|
#include <AudioStream_F32.h> |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class AudioMixer4_F32 : public AudioStream_F32 { |
|
|
|
|
public: |
|
|
|
|
AudioMixer4_F32() : AudioStream_F32(4, inputQueueArray) { |
|
|
|
|
for (int i=0; i<4; i++) multiplier[i] = 0.5; |
|
|
|
|
for (int i=0; i<4; i++) multiplier[i] = 1.0; |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
virtual void update(void); |
|
|
|
|
|
|
|
|
|
void gain(unsigned int channel, float gain) { |
|
|
|
|
if (channel >= 4) return; |
|
|
|
|
if (gain > 127.0f) gain = 127.0f; |
|
|
|
|
else if (gain < 0.0f) gain = 0.0f; |
|
|
|
|
if (channel >= 4 || channel < 0) return; |
|
|
|
|
multiplier[channel] = gain; |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|