Update synth sine for sample rate

synth_sine_f32.cpp

@@ -24,24 +24,27 @@ void AudioSynthWaveformSine_F32::update(void)
 	audio_block_f32_t *block;
 	uint32_t i, ph, inc, index, scale;
 	int32_t val1, val2;
+	static uint32_t block_length = 0;
 	
+	if (enabled) {
 		if (magnitude) {
 			block = allocate_f32();
 			if (block) {
+				block_length = (uint32_t)block->length;
 				ph = phase_accumulator;
 				inc = phase_increment;
-			for (i=0; i < AUDIO_BLOCK_SAMPLES; i++) {
+				for (i=0; i < block_length; i++) {
 					index = ph >> 24;
 					val1 = AudioWaveformSine[index];
 					val2 = AudioWaveformSine[index+1];
 					scale = (ph >> 8) & 0xFFFF;
 					val2 *= scale;
 					val1 *= 0x10000 - scale;
-#if defined(KINETISK)
+	#if defined(KINETISK)
 					block->data[i] = (float) multiply_32x32_rshift32(val1 + val2, magnitude);
-#elif defined(KINETISL)
+	#elif defined(KINETISL)
 					block->data[i] = (float) ((((val1 + val2) >> 16) * magnitude) >> 16);
-#endif
+	#endif
 					ph += inc;
 					
 					block->data[i] = block->data[i] / 32768.0f; // scale to float
@@ -55,7 +58,8 @@ void AudioSynthWaveformSine_F32::update(void)
 				return;
 			}
 		}
-	phase_accumulator += phase_increment * AUDIO_BLOCK_SAMPLES;
+		phase_accumulator += phase_increment * block_length;
+	}
 }
 
 

synth_sine_f32.h

@@ -21,31 +21,44 @@
 class AudioSynthWaveformSine_F32 : public AudioStream_F32
 {
 //GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
+//GUI: shortName:sine  //this line used for automatic generation of GUI node
 public:
-	AudioSynthWaveformSine_F32() : AudioStream_F32(0, NULL), magnitude(16384) {}
+	AudioSynthWaveformSine_F32() : AudioStream_F32(0, NULL), magnitude(16384) { }
+	AudioSynthWaveformSine_F32(const AudioSettings_F32 &settings) : AudioStream_F32(0, NULL), magnitude(16384) {
+		setSampleRate_Hz(settings.sample_rate_Hz);
+	}
 	void frequency(float freq) {
 		if (freq < 0.0) freq = 0.0;
-		else if (freq > AUDIO_SAMPLE_RATE_EXACT/2) freq = AUDIO_SAMPLE_RATE_EXACT/2;
-		phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
+		else if (freq > sample_rate_Hz/2.f) freq = sample_rate_Hz/2.f;
+		phase_increment = freq * (4294967296.0 / sample_rate_Hz);
 	}
 	void phase(float angle) {
-		if (angle < 0.0) angle = 0.0;
-		else if (angle > 360.0) {
-			angle = angle - 360.0;
-			if (angle >= 360.0) return;
+		if (angle < 0.0f) angle = 0.0f;
+		else if (angle > 360.0f) {
+			angle = angle - 360.0f;
+			if (angle >= 360.0f) return;
 		}
-		phase_accumulator = angle * (4294967296.0 / 360.0);
+		phase_accumulator = angle * (4294967296.0f / 360.0f);
 	}
 	void amplitude(float n) {
 		if (n < 0) n = 0;
-		else if (n > 1.0) n = 1.0;
-		magnitude = n * 65536.0;
+		else if (n > 1.0f) n = 1.0f;
+		magnitude = n * 65536.0f;
+	}
+	void setSampleRate_Hz(const float &fs_Hz) {
+		phase_increment *= sample_rate_Hz / fs_Hz; //change the phase increment for the new frequency
+		sample_rate_Hz = fs_Hz;
 	}
+	void begin(void) { enabled = true; }
+	void end(void) { enabled = false; }
 	virtual void update(void);
+	
 private:
-	uint32_t phase_accumulator;
-	uint32_t phase_increment;
-	int32_t magnitude;
+	uint32_t phase_accumulator = 0;
+	uint32_t phase_increment = 0;
+	int32_t magnitude = 0;
+	float sample_rate_Hz = AUDIO_SAMPLE_RATE;
+	volatile uint8_t enabled = 1;
 };