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TeensyAudioMatrixMixer
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palmerr23 3 years ago committed by GitHub
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  1. 71
      matrixMixer_example.ino
  2. 145
      mixerMatrix.cpp
  3. 87
      mixerMatrix.h

71
matrixMixer_example.ino
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/*
* Matrix mixer example
*
*/
#include <Audio.h>
#include "mixerMatrix.h"
#define INS 8
#define OUTS 2
#define BLOX 20
AudioSynthWaveformSine sine1;
AudioAnalyzePeak peak1;
// define the mixer with the required number of INS and OUTS
AudioMixerMatrix Amixer(INS, OUTS);
AudioAnalyzePeak peak2;
AudioAnalyzePeak peak3;
// we need a source of interrupts for the Audio library to operate
// AudioInputAnalog is convenient for T3s, but doesn't create interrupts on the T4 (yet)
// I2S (SGTL5000) is used herre as it's the most common
//AudioInputAnalog adc1;
AudioOutputI2S i2s1;
AudioControlSGTL5000 sgtl1;
// sine to mixer input 1 and peak1
AudioConnection p1(sine1, 0, Amixer, 0);
AudioConnection p2(sine1, 0, peak1, 0);
// mixer outputs 1 & 2 to peaks and I2S
AudioConnection p3(Amixer, 0, i2s1, 0);
AudioConnection p4(Amixer, 0, peak2, 0);
AudioConnection p5(Amixer, 1, i2s1, 1);
AudioConnection p6(Amixer, 1, peak3, 0);
void setup()
{
// put your setup code here, to run once:
AudioMemory(BLOX);
Serial.begin(115200);
delay(1000);
Serial.println("Starting matrix mixer example");
sgtl1.enable();
sine1.frequency(800);
sine1.amplitude(1.0);
Serial.println("Done setup");
}
uint32_t loops;
float Again1 = 1.0, Again2 = 1.0;
void loop() {
int procUse = AudioProcessorUsage();
int memUse = AudioMemoryUsage();
float peakA = peak1.read();
float peakB = peak2.read();
float peakC = peak3.read();
Serial.printf("%i: proc %i, mem %i, input level %3.2f\n", loops, procUse, memUse, peakA);
Serial.printf("Gain1 %3.2f, output1 level %3.2f\n", Again1, peakB);
Serial.printf("Gain2 %3.2f, output2 level %3.2f\n\n", Again2, peakC);
// set gain for next iteration
Again1 = (float)random(100, 1000) / 1000.0; // gain 0.1 .. 1.0
Amixer.gain(0, 0, Again1);
Again2 = (float)random(100, 1000) / 1000.0; // gain 0.1 .. 1.0
Amixer.gain(0, 1, Again2);
delay(5000);
loops++;
}

145
mixerMatrix.cpp
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/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Modified by Macaba, palmerr23
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <Arduino.h>
#include "mixerMatrix.h"
#include "utility/dspinst.h"
#if defined(__ARM_ARCH_7EM__)
#define MULTI_UNITYGAIN 65536
static void applyGain(int16_t *data, int32_t mult)
{
uint32_t *p = (uint32_t *)data;
const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES);
do {
uint32_t tmp32 = *p; // read 2 samples from *data
int32_t val1 = signed_multiply_32x16b(mult, tmp32);
int32_t val2 = signed_multiply_32x16t(mult, tmp32);
val1 = signed_saturate_rshift(val1, 16, 0);
val2 = signed_saturate_rshift(val2, 16, 0);
*p++ = pack_16b_16b(val2, val1);
} while (p < end);
}
static void applyGainThenAdd(int16_t *data, const int16_t *in, int32_t mult)
{
uint32_t *dst = (uint32_t *)data;
const uint32_t *src = (uint32_t *)in;
const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES);
if (mult == MULTI_UNITYGAIN) {
do {
uint32_t tmp32 = *dst;
*dst++ = signed_add_16_and_16(tmp32, *src++);
tmp32 = *dst;
*dst++ = signed_add_16_and_16(tmp32, *src++);
} while (dst < end);
} else {
do {
uint32_t tmp32 = *src++; // read 2 samples from *data
int32_t val1 = signed_multiply_32x16b(mult, tmp32);
int32_t val2 = signed_multiply_32x16t(mult, tmp32);
val1 = signed_saturate_rshift(val1, 16, 0);
val2 = signed_saturate_rshift(val2, 16, 0);
tmp32 = pack_16b_16b(val2, val1);
uint32_t tmp32b = *dst;
*dst++ = signed_add_16_and_16(tmp32, tmp32b);
} while (dst < end);
}
}
#elif defined(KINETISL)
#define MULTI_UNITYGAIN 256
static void applyGain(int16_t *data, int32_t mult)
{
const int16_t *end = data + AUDIO_BLOCK_SAMPLES;
do {
int32_t val = *data * mult;
*data++ = signed_saturate_rshift(val, 16, 0);
} while (data < end);
}
static void applyGainThenAdd(int16_t *dst, const int16_t *src, int32_t mult)
{
const int16_t *end = dst + AUDIO_BLOCK_SAMPLES;
if (mult == MULTI_UNITYGAIN) {
do {
int32_t val = *dst + *src++;
*dst++ = signed_saturate_rshift(val, 16, 0);
} while (dst < end);
} else {
do {
int32_t val = *dst + ((*src++ * mult) >> 8); // overflow possible??
*dst++ = signed_saturate_rshift(val, 16, 0);
} while (dst < end);
}
}
#endif
void AudioMixerMatrix::update(void)
{
audio_block_t *in[MMINMAX], *out=NULL;
unsigned int inChannel, outChannel;
unsigned int sample;
// get the incoming audio_blocks
for (inChannel=0; inChannel < inChannels; inChannel++) {
in[inChannel] = receiveReadOnly(inChannel);
}
// crosspoint mix
for (outChannel=0; outChannel < outChannels; outChannel++) {
out = allocate(); //get an audio_block that we'll sum the other channels to
for(sample=0; sample < AUDIO_BLOCK_SAMPLES; sample++){
out->data[sample] = 0; // slightly faster than memset()?
}
// OR memset(out->data, 0, AUDIO_BLOCK_SAMPLES * sizeof(int16_t));
if(out){
for (inChannel=0; inChannel < inChannels; inChannel++) {
if (in[inChannel]) {
applyGainThenAdd(out->data, in[inChannel]->data, multiplier[inChannel][outChannel]);
}
}
transmit(out, outChannel);
release(out);
}
} //outChannel
//Now release all the input audio_blocks
for (inChannel=0; inChannel < inChannels; inChannel++) {
if(in[inChannel])
release(in[inChannel]);
}
}

87
mixerMatrix.h
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/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Modified by Macaba, palmerr23
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef mixer8_h_
#define mixer8_h_
#include "Arduino.h"
#include "AudioStream.h"
#define MMINPUTS 4 // default numbers for inputs and outputs
#define MMOUTPUTS 4
#define MMINMAX 8 // Biggest values
#define MMOUTMAX 8
class AudioMixerMatrix : public AudioStream
{
#if defined(__ARM_ARCH_7EM__)
public:
AudioMixerMatrix(uint8_t inCh = MMINPUTS, uint8_t outCh = MMOUTPUTS) : AudioStream(inCh, inputQueueArray) {
inChannels = inCh;
outChannels = outCh;
for (int i=0; i< MMINMAX; i++)
for(int j=0; j<MMOUTMAX; j++)
multiplier[i][j] = 65536;
}
virtual void update(void);
void gain(unsigned int inChannel, unsigned int outChannel, float gain) {
if (outChannel >= MMOUTMAX) return;
if (inChannel >= MMINMAX) return;
if (gain > 32767.0f) gain = 32767.0f;
else if (gain < -32767.0f) gain = -32767.0f;
multiplier[inChannel][outChannel] = gain * 65536.0f; // TODO: proper roundoff?
}
private:
int32_t multiplier[MMINMAX][MMOUTMAX];
audio_block_t *inputQueueArray[MMINMAX];
uint8_t inChannels, outChannels;
#elif defined(KINETISL)
public:
AudioMixerMatrix(uint8_t inCh = MMINPUTS, uint8_t outCh = MMOUTPUTS) : AudioStream(inCh, inputQueueArray) {
inChannels = inCh;
outChannels = outCh;
for (int i=0; i< MMINMAX; i++)
for(int j=0; j<MMOUTMAX; j++)
multiplier[i][j] = multiplier[i][j] = 256;
}
virtual void update(void);
void gain(unsigned int inChannel, unsigned int outChannel, float gain) {
if (outChannel >= MMOUTMAX) return;
if (inChannel >= MMINMAX) return;
if (gain > 127.0f) gain = 127.0f;
else if (gain < -127.0f) gain = -127.0f;
multiplier[inChannel][outChannel] = gain * 256.0f; // TODO: proper roundoff?
}
private:
int16_t multiplier[MMINMAX][MMOUTMAX];
audio_block_t *inputQueueArray[MMINMAX];
uint8_t inChannels, outChannels;
#endif
};
#endif
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