Using Teensy Audio with another class

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markvr

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I have a class I wrote myself that uses the native ARM FFT routines to sample audio inputs to an analog pin. It samples the pin, does the FFT, and then saves the FFT results in an array. I store about 100 FFT results (ie. the array is int[100[256]) to average out the values over time.

It works OK but is quite messy because I don't really understand the audio/fft stuff fully - it's mostly just copied from bits and pieces of code on this forum.

I'd like to replace that bit with the FFT abilities of the TeensyAudio library. I have test code working based on the example:
Code: 
#include <Audio.h>
#include <Wire.h>
#include <SD.h>

  AudioInputAnalog    analogPinInput(16);         // audio shield: mic or line-in
  AudioAnalyzeFFT256  myFFT(20);
  
  AudioConnection c2(analogPinInput, 0, myFFT, 0);



void setup() {
  // Audio connections require memory to work.  For more
  // detailed information, see the MemoryAndCpuUsage example
  AudioMemory(12);

}

void loop() {
  if (myFFT.available()) {
    // each time new FFT data is available
    // print it all to the Arduino Serial Monitor
    Serial.print("FFT: ");
    for (int i=0; i<128; i++) {
      Serial.print(myFFT.output[i]);
      Serial.print(",");
    }
    Serial.println();
  }
}

However I'd like to use the library in my own audio class. I'm new to C/C++, especially classes and am not sure how to to this.
I tried:
Code: 
#ifndef _AUDIO_h
#define _AUDIO_h

#include "Arduino.h"
#include <Audio/Audio.h>

#define FFT_SIZE  64

class TronAudio
{
 private:
	AudioAnalyzeFFT256  myFFT;
	AudioInputAnalog    analogPinInput;

 public:
	TronAudio();
	void getSpectrum(int spectrumOut[]);
 	
};

#endif
Code: 
#include <Audio/Audio.h>
#include <Wire.h>
#include <SD.h>
#include "TronAudio.h";

TronAudio::TronAudio() {
	analogPinInput(16);         // audio shield: mic or line-in
	myFFT(20);
	AudioConnection c2(analogPinInput, 0, myFFT, 0);
}



void TronAudio::getSpectrum(int spectrumOut[]) {
	if (myFFT.available()) {
		memcpy(spectrumOut, myFFT.output, 128 * sizeof(int)); 
	}
}
But won't compile, with errors:
Code: 
Compiling 'Tron' for 'Teensy 3.0'
TronAudio.cpp:In constructor 'TronAudio::TronAudio()'
TronAudio.cpp:6:22: error: no matching function for call to 'AudioInputAnalog::AudioInputAnalog()'
TronAudio.cpp:candidates are
Audio.h:In file included from
TronAudio.cpp:from
input_adc.h:AudioInputAnalog(unsigned int)
input_adc.h:candidate expects 1 argument, 0 provided
input_adc.h:AudioInputAnalog(const AudioInputAnalog&)
input_adc.h:candidate expects 1 argument, 0 provided
input_adc.h:AudioInputAnalog(AudioInputAnalog&&)
input_adc.h:candidate expects 1 argument, 0 provided
TronAudio.cpp:7:19: error: no match for call to '(AudioInputAnalog) (int)'
TronAudio.cpp:8:10: error: no match for call to '(AudioAnalyzeFFT256) (int)'
Error compiling
Compiling 'test' for 'Teensy 3.0'
Binary sketch size: 14,136 bytes (used 11% of a 131,072 byte maximum) (0.57 secs)

Presumably because I'm trying to instantiate the object in the header, without passing the required params. However If I put the initial params in the header file e.g.:
Code: 
...
private:
	AudioAnalyzeFFT256  myFFT(16);
	AudioInputAnalog    analogPinInput(20);

It throws:
Code: 
Compiling 'Tron' for 'Teensy 3.0'
TronAudio.cpp:In file included from
TronAudio.h:12:28: error: expected identifier before numeric constant
TronAudio.h:12:28: error: expected ',' or '...' before numeric constant
TronAudio.h:13:37: error: expected identifier before numeric constant
TronAudio.h:13:37: error: expected ',' or '...' before numeric constant
TronAudio.cpp:In constructor 'TronAudio::TronAudio()'
TronAudio.cpp:9:48: error: no matching function for call to 'AudioConnection::AudioConnection(<unresolved overloaded function type>, int, <unresolved overloaded function type>, int)'
TronAudio.cpp:candidates are
analyze_fft256.h:In file included from
Audio.h:from
TronAudio.cpp:from
AudioStream.h:AudioConnection(AudioStream&, unsigned char, AudioStream&, unsigned char)
AudioStream.h:no known conversion for argument 1 from '<unresolved overloaded function type>' to 'AudioStream&'
AudioStream.h:AudioConnection(AudioStream&, AudioStream&)
AudioStream.h:candidate expects 2 arguments, 4 provided
AudioStream.h:AudioConnection(const AudioConnection&)
AudioStream.h:candidate expects 1 argument, 4 provided
AudioStream.h:AudioConnection(AudioConnection&&)
AudioStream.h:candidate expects 1 argument, 4 provided
TronAudio.cpp:In member function 'void TronAudio::getSpectrum(int*)'
TronAudio.cpp:15:11: error: '((TronAudio*)this)->TronAudio::myFFT' does not have class type
TronAudio.cpp:16:28: error: '((TronAudio*)this)->TronAudio::myFFT' does not have class type
Error compiling
Compiling 'test' for 'Teensy 3.0'
Binary sketch size: 14,136 bytes (used 11% of a 131,072 byte maximum) (0.56 secs)

So how can I define and use the Teensy Audio class inside my own TronAudio class?
 
About 5min after posting the above, I found a blog post (http://arduinoetcetera.blogspot.co.uk/2011/01/classes-within-classes-initialiser.html) and managed to get the TronAudio class to compile with the following code:
Code: 
#ifndef _AUDIO_h
#define _AUDIO_h

#include "Arduino.h"
#include <Audio/Audio.h>

#define FFT_SIZE  64

class TronAudio
{
 private:
	AudioAnalyzeFFT256  myFFT;
	AudioInputAnalog    analogPinInput;

 public:
	TronAudio();
	void getSpectrum(int spectrumOut[]);
 	
};

#endif
Code: 
#include <Audio/Audio.h>
#include <Wire.h>
#include <SD.h>
#include "TronAudio.h";

TronAudio::TronAudio() : myFFT(16), analogPinInput(20) {
	AudioConnection c2(analogPinInput, 0, myFFT, 0);
}



void TronAudio::getSpectrum(int spectrumOut[]) {
	if (myFFT.available()) {
		memcpy(spectrumOut, myFFT.output, 128 * sizeof(int)); 
	}
}

However, If I try and use the class from my main file, I now get:
Code: 
Compiling 'Tron' for 'Teensy 3.0'
TronAudio.cpp.o:In function `AudioAnalyzeFFT256'
analyze_fft256.h:init()'
TronAudio.cpp.o:In function `AudioInputAnalog'
input_adc.h:begin(unsigned int)'
TronAudio.cpp.o:In function `TronAudio::TronAudio()'
TronAudio.cpp:undefined reference to `vtable for AudioAnalyzeFFT256'
TronAudio.cpp:undefined reference to `AudioWindowHanning256'
TronAudio.cpp:undefined reference to `vtable for AudioInputAnalog'
collect2.exe*:error: ld returned 1 exit status
Error creating .elf
Compiling 'test' for 'Teensy 3.0'
Binary sketch size: 14,136 bytes (used 11% of a 131,072 byte maximum) (0.59 secs)
 
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