Add AudioSynthWaveform (any waveform), remove AudioSineWave (sine only)

Audio.cpp

 
 
 
+/******************************************************************/
 
 
-
-
-
-static const int16_t sine_table[] = {
-     0,   804,  1608,  2410,  3212,  4011,  4808,  5602,  6393,  7179,
-  7962,  8739,  9512, 10278, 11039, 11793, 12539, 13279, 14010, 14732,
- 15446, 16151, 16846, 17530, 18204, 18868, 19519, 20159, 20787, 21403,
- 22005, 22594, 23170, 23731, 24279, 24811, 25329, 25832, 26319, 26790,
- 27245, 27683, 28105, 28510, 28898, 29268, 29621, 29956, 30273, 30571,
- 30852, 31113, 31356, 31580, 31785, 31971, 32137, 32285, 32412, 32521,
- 32609, 32678, 32728, 32757, 32767, 32757, 32728, 32678, 32609, 32521,
- 32412, 32285, 32137, 31971, 31785, 31580, 31356, 31113, 30852, 30571,
- 30273, 29956, 29621, 29268, 28898, 28510, 28105, 27683, 27245, 26790,
- 26319, 25832, 25329, 24811, 24279, 23731, 23170, 22594, 22005, 21403,
- 20787, 20159, 19519, 18868, 18204, 17530, 16846, 16151, 15446, 14732,
- 14010, 13279, 12539, 11793, 11039, 10278,  9512,  8739,  7962,  7179,
-  6393,  5602,  4808,  4011,  3212,  2410,  1608,   804,     0,  -804,
- -1608, -2410, -3212, -4011, -4808, -5602, -6393, -7179, -7962, -8739,
- -9512,-10278,-11039,-11793,-12539,-13279,-14010,-14732,-15446,-16151,
--16846,-17530,-18204,-18868,-19519,-20159,-20787,-21403,-22005,-22594,
--23170,-23731,-24279,-24811,-25329,-25832,-26319,-26790,-27245,-27683,
--28105,-28510,-28898,-29268,-29621,-29956,-30273,-30571,-30852,-31113,
--31356,-31580,-31785,-31971,-32137,-32285,-32412,-32521,-32609,-32678,
--32728,-32757,-32767,-32757,-32728,-32678,-32609,-32521,-32412,-32285,
--32137,-31971,-31785,-31580,-31356,-31113,-30852,-30571,-30273,-29956,
--29621,-29268,-28898,-28510,-28105,-27683,-27245,-26790,-26319,-25832,
--25329,-24811,-24279,-23731,-23170,-22594,-22005,-21403,-20787,-20159,
--19519,-18868,-18204,-17530,-16846,-16151,-15446,-14732,-14010,-13279,
--12539,-11793,-11039,-10278, -9512, -8739, -7962, -7179, -6393, -5602,
- -4808, -4011, -3212, -2410, -1608,  -804,     0
-};
-
-
-void AudioSineWave::frequency(float f)
-{
-	if (f > AUDIO_SAMPLE_RATE_EXACT / 2 || f < 0.0) return;
-	phase_increment = (f / AUDIO_SAMPLE_RATE_EXACT) * 4294967296.0f;
-}
-
-void AudioSineWave::update(void)
+void AudioSynthWaveform::update(void)
 {
 	audio_block_t *block;
 	uint32_t i, ph, inc, index, scale;
 	int32_t val1, val2, val3;
 
-	//Serial.println("AudioSineWave::update");
-
+	//Serial.println("AudioSynthWaveform::update");
 	if (magnitude > 0 && (block = allocate()) != NULL) {
 		ph = phase;
 		inc = phase_increment;
 		for (i=0; i < AUDIO_BLOCK_SAMPLES; i++) {
 			index = ph >> 24;
-			val1 = sine_table[index];
-			val2 = sine_table[index+1];
+			val1 = wavetable[index];
+			val2 = wavetable[index+1];
 			scale = (ph >> 8) & 0xFFFF;
 			val2 *= scale;
 			val1 *= 0xFFFF - scale;
 
 
 
-
-
-
-
-
-
-
-
+#if 0
 void AudioSineWaveMod::frequency(float f)
 {
 	if (f > AUDIO_SAMPLE_RATE_EXACT / 2 || f < 0.0) return;
 	transmit(block);
 	release(block);
 }
-
+#endif
 
 
 

Audio.h

 
 
 
-class AudioSineWave : public AudioStream
+class AudioSynthWaveform : public AudioStream
 {
 public:
-	AudioSineWave() : AudioStream(0, NULL) { magnitude = 0; }
-	void frequency(float freq);
-	//void amplitude(double n) { amplitude((float)n); }
+	AudioSynthWaveform(const int16_t *waveform)
+	  : AudioStream(0, NULL), wavetable(waveform), magnitude(0), phase(0) { }
+	void frequency(float freq) {
+		if (freq > AUDIO_SAMPLE_RATE_EXACT / 2 || freq < 0.0) return;
+		phase_increment = (freq / AUDIO_SAMPLE_RATE_EXACT) * 4294967296.0f;
+	}
 	void amplitude(float n) {        // 0 to 1.0
 		if (n < 0) n = 0;
 		else if (n > 1.0) n = 1.0;
 		magnitude = n * 32767.0;
-		Serial.print("magnitude(f) = ");
-		Serial.println(magnitude);
-	}
-/*
-	void amplitude(int n) { // 0 to 32767
-		if (n < 0) n = 0;
-		else if (n > 32767) n = 32767;
-		magnitude = n;
-		Serial.print("magnitude(i) = ");
-		Serial.println(magnitude);
-	}
-	void amplitude(unsigned int n) { // 0 to 32767
-		if (n > 32767) n = 32767;
-		magnitude = n;
-		Serial.print("magnitude(u) = ");
-		Serial.println(magnitude);
 	}
-*/
 	virtual void update(void);
 private:
+	const int16_t *wavetable;
 	uint16_t magnitude;
 	uint32_t phase;
 	uint32_t phase_increment;
 
 
 
+#if 0
 class AudioSineWaveMod : public AudioStream
 {
 public:
 	uint32_t modulation_factor;
 	audio_block_t *inputQueueArray[1];
 };
-
+#endif
 
 
 

examples/PassThroughPlusTone/PassThroughPlusTone.ino

 // order data flows, inputs/sources -> processing -> outputs
 //
 //AudioInputAnalog analogPinInput(16); // analog A2 (pin 16)
-AudioInputI2S    audioInput;         // audio shield: mic or line-in
-AudioSineWave    toneLow;
-AudioSineWave    toneHigh;
-AudioMixer4      mixerLeft;          
-AudioMixer4      mixerRight;          
-AudioOutputI2S   audioOutput;        // audio shield: headphones & line-out
-AudioOutputPWM   pwmOutput;          // audio output with PWM on pins 3 & 4
+AudioInputI2S       audioInput;         // audio shield: mic or line-in
+AudioSynthWaveform  toneLow(AudioWaveformSine);
+AudioSynthWaveform  toneHigh(AudioWaveformTriangle);
+AudioMixer4         mixerLeft;
+AudioMixer4         mixerRight;
+AudioOutputI2S      audioOutput;        // audio shield: headphones & line-out
+AudioOutputPWM      pwmOutput;          // audio output with PWM on pins 3 & 4
 
 // Create Audio connections between the components
 //

examples/PlayMidiTones/MidiTones.ino

 
 //AudioInputI2S adc;
 //AudioInputAnalog ana(16);
-AudioSineWave mysine;
-AudioSineWave sine2;
+AudioSynthWaveform mysine(AudioWaveformSine);
+AudioSynthWaveform sine2(AudioWaveformSine);
 //AudioOutputPWM myout;
 //AudioPlaySDcardWAV wav;
 //AudioPlaySDcardRAW wav;