Here's a simple use of the play and record queue objects. By default it plays stereo audio from line input to output (headphones). If a button is pushed, it simply swaps the left and right channels.
It was tested on a T3.6 and on a T4.
Pete
Code:
// Tested on a T3.6 using pin 32 for the button
// On T4 it uses pin 0
// Simple demo of the use of record and play queues
// If a button is pressed, switch the L and R channels
// of the audio. Otherwise, play straight through.
// By Pete El_Supremo 200119
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// Use this define to test that audio is playing
// Then undefine it to test the channel switching
//#define STRAIGHT_THRU
#ifdef STRAIGHT_THRU
AudioInputI2S i2s_in;
AudioOutputI2S i2s_out;
AudioConnection patchCord1(i2s_in, 0, i2s_out, 0);
AudioConnection patchCord2(i2s_in, 1, i2s_out, 1);
AudioControlSGTL5000 sgtl5000;
#else
// GUItool: begin automatically generated code
AudioInputI2S i2s_in; //xy=357.8833312988281,290
AudioRecordQueue Q_in_L; //xy=533.8833312988281,215.88333129882812
AudioRecordQueue Q_in_R; //xy=538.8833312988281,341.8833312988281
AudioPlayQueue Q_out_L; //xy=681.8833312988281,217.88333129882812
AudioPlayQueue Q_out_R; //xy=682.8833312988281,338.8833312988281
AudioOutputI2S i2s_out; //xy=837.88330078125,276
AudioConnection patchCord1(i2s_in, 0, Q_in_L, 0);
AudioConnection patchCord2(i2s_in, 1, Q_in_R, 0);
AudioConnection patchCord3(Q_out_L, 0, i2s_out, 0);
AudioConnection patchCord4(Q_out_R, 0, i2s_out, 1);
AudioControlSGTL5000 sgtl5000; //xy=452.8833312988281,423
// GUItool: end automatically generated code
#endif
// Choose MICrophone or LINEIN
//const int myInput = AUDIO_INPUT_MIC;
const int myInput = AUDIO_INPUT_LINEIN;
short buf_L[AUDIO_BLOCK_SAMPLES];
short buf_R[AUDIO_BLOCK_SAMPLES];
// Button uses pin 32 on T3.6
//#define SWITCH_PIN 32
// Button uses pin 0 on T4
#define SWITCH_PIN 0
// debounce the button
#include <Bounce.h>
Bounce bouncer = Bounce( SWITCH_PIN,5 );
void setup(void)
{
pinMode(SWITCH_PIN,INPUT_PULLUP);
// Audio connections require memory. and the record queue
// uses this memory to buffer incoming audio.
AudioMemory(10);
// Enable the audio shield. select input. and enable output
sgtl5000.enable();
sgtl5000.inputSelect(myInput);
sgtl5000.volume(0.5);
#ifndef STRAIGHT_THRU
// Start the record queues
Q_in_L.begin();
Q_in_R.begin();
#endif
}
void loop(void)
{
#ifndef STRAIGHT_THRU
short *bp_L, *bp_R;
// Update the debouncer
bouncer.update();
// When a left and right input buffer are available
// process them both
if (Q_in_L.available() >= 1 && Q_in_R.available() >= 1) {
bp_L = Q_in_L.readBuffer();
bp_R = Q_in_R.readBuffer();
// Copy the audio buffers to our memory
for(int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
buf_L[i] = bp_L[i];
buf_R[i] = bp_R[i];
}
// Free the input audio buffers
Q_in_L.freeBuffer();
Q_in_R.freeBuffer();
// Process the buffers - if needed.
// in this case - nothing to do
if(bouncer.read()) {
// Get pointers to "empty" output buffers
bp_L = Q_out_L.getBuffer();
bp_R = Q_out_R.getBuffer();
} else {
// Get pointers to "empty" output buffers
// but switch them around
bp_L = Q_out_R.getBuffer();
bp_R = Q_out_L.getBuffer();
}
// copy the (un)processed data back to the output
for(int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
bp_L[i] = buf_L[i];
bp_R[i] = buf_R[i];
}
// and play them back into the audio queues
Q_out_L.playBuffer();
Q_out_R.playBuffer();
}
#endif
}
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Originally Posted by el_supremo
