58 lines
1.8 KiB
58 lines
1.8 KiB
4 years ago
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/*
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* AudioEffectGain_F32
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*
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* Created: Chip Audette, November 2016
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* Purpose; Apply digital gain to the audio data. Assumes floating-point data.
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*
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* This processes a single stream fo audio data (ie, it is mono)
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*
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* MIT License. use at your own risk.
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*/
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#ifndef _AudioEffectGain_F32_h
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#define _AudioEffectGain_F32_h
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#include <arm_math.h> //ARM DSP extensions. for speed!
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#include <AudioStream_F32.h>
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class AudioEffectGain_F32 : public AudioStream_F32
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{
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//GUI: inputs:1, outputs:1 //this line used for automatic generation of GUI node
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public:
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//constructor
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AudioEffectGain_F32(void) : AudioStream_F32(1, inputQueueArray_f32) {};
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AudioEffectGain_F32(const AudioSettings_F32 &settings) : AudioStream_F32(1, inputQueueArray_f32) {};
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//here's the method that does all the work
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void update(void) {
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//Serial.println("AudioEffectGain_F32: updating."); //for debugging.
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audio_block_f32_t *block;
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block = AudioStream_F32::receiveWritable_f32();
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if (!block) return;
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//apply the gain
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//for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) block->data[i] = gain * (block->data[i]); //non DSP way to do it
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arm_scale_f32(block->data, gain, block->data, block->length); //use ARM DSP for speed!
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//transmit the block and be done
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AudioStream_F32::transmit(block);
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AudioStream_F32::release(block);
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}
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//methods to set parameters of this module
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void setGain(float g) { gain = g; }
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void setGain_dB(float gain_dB) {
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float gain = pow(10.0, gain_dB / 20.0);
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setGain(gain);
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}
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//methods to return information about this module
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float getGain(void) { return gain; }
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float getGain_dB(void) { return 20.0*log10(gain); }
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private:
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audio_block_f32_t *inputQueueArray_f32[1]; //memory pointer for the input to this module
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float gain = 1.0; //default value
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};
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#endif
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