Add AudioEffectDigitalCombine (from Bleep Labs)

Audio.h

 #include "effect_freeverb.h"
 #include "effect_waveshaper.h"
 #include "effect_granular.h"
+#include "effect_combine.h"
 #include "filter_biquad.h"
 #include "filter_fir.h"
 #include "filter_variable.h"

effect_combine.cpp

+/*
+ * Copyright (c) 2018 John-Michael Reed
+ * bleeplabs.com
+ *
+ * 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 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.
+ */
+
+//  Combine analog signals with bitwise expressions like XOR.
+//  Combining two simple oscillators results in interesting new waveforms, 
+//  Combining white noise or dynamic incoming audio results in aggressive digital distortion.
+ 
+#include <Arduino.h>
+#include "effect_combine.h"
+
+void AudioEffectDigitalCombine::update(void)
+{
+	audio_block_t *blocka, *blockb;
+	uint32_t *pa, *pb, *end;
+	uint32_t a12, a34; //, a56, a78;
+	uint32_t b12, b34; //, b56, b78;
+
+	blocka = receiveWritable(0);
+	blockb = receiveReadOnly(1);
+	if (!blocka) {
+		if (blockb) release(blockb);
+		return;
+	}
+	if (!blockb) {
+		release(blocka);
+		return;
+	}
+	pa = (uint32_t *)(blocka->data);
+	pb = (uint32_t *)(blockb->data);
+	end = pa + AUDIO_BLOCK_SAMPLES / 2;
+
+	while (pa < end) {
+		a12 = *pa;
+		a34 = *(pa + 1);
+		b12 = *pb++;
+		b34 = *pb++;
+		if (mode_sel == OR) {
+			a12 = a12 | b12;
+			a34 = a34 | b34;
+		}
+		if (mode_sel == XOR) {
+			a12 = a12 ^ b12;
+			a34 = a34 ^ b34;
+		}
+		if (mode_sel == AND) {
+			a12 = a12 & b12;
+			a34 = a34 & b34;
+		}
+		if (mode_sel == MODULO) {
+			a12 = a12 % b12;
+			a34 = a34 % b34;
+		}
+		*pa++ = a12;
+		*pa++ = a34;
+	}
+	transmit(blocka);
+	release(blocka);
+	release(blockb);
+}
+

effect_combine.h

+/* Audio Library for Teensy 3.X
+ * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
+ *
+ * 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.
+ 
+   Combine analog signals with bitwise expressions like OXR. Combining two simple oscillators results in interesting new waveforms, 
+   Combining white noise or dynamic incoming audio results in aggressive digital distortion.
+ 
+ */
+
+#ifndef effect_digital_combine_h_
+#define effect_digital_combine_h_
+#include <Arduino.h>
+#include "AudioStream.h"
+
+#define OR      0
+#define XOR  1
+#define AND    2
+#define MODULO  3
+
+class AudioEffectDigitalCombine : public AudioStream
+{
+public:
+	AudioEffectDigitalCombine() : AudioStream(2, inputQueueArray), mode_sel(OR) { }
+	void mode(short mode_in) {
+		if (mode_in > 3) {
+	  		mode_in = 3;
+	  	}
+	  	mode_sel = mode_in;
+	}
+	virtual void update(void);
+private:
+	short mode_sel;
+	audio_block_t *inputQueueArray[2];
+};
+
+#endif

keywords.txt

 AudioEffectMidSide	KEYWORD2
 AudioEffectWaveshaper	KEYWORD2
 AudioEffectGranular	KEYWORD2
+AudioEffectDigitalCombine	KEYWORD2
 AudioFilterBiquad	KEYWORD2
 AudioFilterFIR	KEYWORD2
 AudioFilterStateVariable	KEYWORD2