comparison examples/cape_test/render.cpp @ 300:dbeed520b014 prerelease

Renamed projects to examples

+/*
+ * render.cpp
+ *
+ *  Created on: Oct 24, 2014
+ *      Author: parallels
+ */
+
+
+#include <BeagleRT.h>
+#include <cmath>
+
+#define ANALOG_LOW	(2048.0 / 65536.0)
+#define ANALOG_HIGH (50000.0 / 65536.0)
+
+const int gDACPinOrder[] = {6, 4, 2, 0, 1, 3, 5, 7};
+
+enum {
+	kStateTestingAudioLeft = 0,
+	kStateTestingAudioRight,
+	kStateTestingAudioDone
+};
+
+uint64_t gLastErrorFrame = 0;
+uint32_t gEnvelopeSampleCount = 0;
+float gEnvelopeValueL = 0.5, gEnvelopeValueR = 0.5;
+float gEnvelopeDecayRate = 0.9995;
+int gEnvelopeLastChannel = 0;
+
+float gPositivePeakLevels[2] = {0, 0};
+float gNegativePeakLevels[2] = {0, 0};
+float gPeakLevelDecayRate = 0.999;
+const float gPeakLevelLowThreshold = 0.02;
+const float gPeakLevelHighThreshold = 0.2;
+const float gDCOffsetThreshold = 0.1;
+int gAudioTestState = kStateTestingAudioLeft;
+int gAudioTestStateSampleCount = 0;
+int gAudioTestSuccessCounter = 0;
+const int gAudioTestSuccessCounterThreshold = 64;
+const int gAudioTestStateSampleThreshold = 16384;
+
+// setup() is called once before the audio rendering starts.
+// Use it to perform any initialisation and allocation which is dependent
+// on the period size or sample rate.
+//
+// userData holds an opaque pointer to a data structure that was passed
+// in from the call to initAudio().
+//
+// Return true on success; returning false halts the program.
+
+bool setup(BeagleRTContext *context, void *userData)
+{
+	return true;
+}
+
+// render() is called regularly at the highest priority by the audio engine.
+// Input and output are given from the audio hardware and the other
+// ADCs and DACs (if available). If only audio is available, numMatrixFrames
+// will be 0.
+
+void render(BeagleRTContext *context, void *userData)
+{
+	static float phase = 0.0;
+	static int sampleCounter = 0;
+	static int invertChannel = 0;
+	float frequency = 0;
+
+	// Play a sine wave on the audio output
+	for(unsigned int n = 0; n < context->audioFrames; n++) {
+		
+		// Peak detection on the audio inputs, with offset to catch
+		// DC errors
+		for(int ch = 0; ch < 2; ch++) {
+			if(context->audioIn[2*n + ch] > gPositivePeakLevels[ch])
+				gPositivePeakLevels[ch] = context->audioIn[2*n + ch];
+			gPositivePeakLevels[ch] += 0.1;
+			gPositivePeakLevels[ch] *= gPeakLevelDecayRate;
+			gPositivePeakLevels[ch] -= 0.1;
+			if(context->audioIn[2*n + ch] < gNegativePeakLevels[ch])
+				gNegativePeakLevels[ch] = context->audioIn[2*n + ch];
+			gNegativePeakLevels[ch] -= 0.1;			
+			gNegativePeakLevels[ch] *= gPeakLevelDecayRate;
+			gNegativePeakLevels[ch] += 0.1;
+		}
+		
+		if(gAudioTestState == kStateTestingAudioLeft) {
+			context->audioOut[2*n] = 0.2 * sinf(phase);
+			context->audioOut[2*n + 1] = 0;		
+			
+			frequency = 3000.0;
+			phase += 2.0 * M_PI * frequency / 44100.0;
+			if(phase >= 2.0 * M_PI)
+				phase -= 2.0 * M_PI;
+			
+			gAudioTestStateSampleCount++;
+			if(gAudioTestStateSampleCount >= gAudioTestStateSampleThreshold) {
+				// Check if we have the expected input: signal on the left but not
+				// on the right. Also check that there is not too much DC offset on the
+				// inactive signal
+				if((gPositivePeakLevels[0] - gNegativePeakLevels[0]) >= gPeakLevelHighThreshold 
+					&& (gPositivePeakLevels[1] -  gNegativePeakLevels[1]) <= gPeakLevelLowThreshold &&
+					fabsf(gPositivePeakLevels[1]) < gDCOffsetThreshold &&
+					fabsf(gNegativePeakLevels[1]) < gDCOffsetThreshold) {
+					// Successful test: increment counter
+					gAudioTestSuccessCounter++;
+					if(gAudioTestSuccessCounter >= gAudioTestSuccessCounterThreshold) {
+						gAudioTestState = kStateTestingAudioRight;
+						gAudioTestStateSampleCount = 0;
+						gAudioTestSuccessCounter = 0;
+					}
+
+				}
+				else {
+					if(!((context->audioSampleCount + n) % 22050)) {
+						// Debugging print messages
+						if((gPositivePeakLevels[0] - gNegativePeakLevels[0]) < gPeakLevelHighThreshold)
+							rt_printf("Left Audio In FAIL: insufficient signal: %f\n", 
+										gPositivePeakLevels[0] - gNegativePeakLevels[0]);
+						else if(gPositivePeakLevels[1] -  gNegativePeakLevels[1] > gPeakLevelLowThreshold)
+							rt_printf("Right Audio In FAIL: signal present when it should not be: %f\n",
+										gPositivePeakLevels[1] -  gNegativePeakLevels[1]);
+						else if(fabsf(gPositivePeakLevels[1]) >= gDCOffsetThreshold ||
+								fabsf(gNegativePeakLevels[1]) >= gDCOffsetThreshold)
+							rt_printf("Right Audio In FAIL: DC offset: (%f, %f)\n",
+										gPositivePeakLevels[1], gNegativePeakLevels[1]);						
+					}
+					gAudioTestSuccessCounter--;
+					if(gAudioTestSuccessCounter <= 0)
+						gAudioTestSuccessCounter = 0;
+				}
+			}
+		}
+		else if(gAudioTestState == kStateTestingAudioRight) {
+			context->audioOut[2*n] = 0;
+			context->audioOut[2*n + 1] = 0.2 * sinf(phase);
+			
+			frequency = 3000.0;
+			phase += 2.0 * M_PI * frequency / 44100.0;
+			if(phase >= 2.0 * M_PI)
+				phase -= 2.0 * M_PI;
+			
+			gAudioTestStateSampleCount++;
+			if(gAudioTestStateSampleCount >= gAudioTestStateSampleThreshold) {
+				// Check if we have the expected input: signal on the left but not
+				// on the right
+				if((gPositivePeakLevels[1] - gNegativePeakLevels[1]) >= gPeakLevelHighThreshold 
+					&& (gPositivePeakLevels[0] -  gNegativePeakLevels[0]) <= gPeakLevelLowThreshold &&
+					fabsf(gPositivePeakLevels[0]) < gDCOffsetThreshold &&
+					fabsf(gNegativePeakLevels[0]) < gDCOffsetThreshold) {
+					// Successful test: increment counter
+					gAudioTestSuccessCounter++;
+					if(gAudioTestSuccessCounter >= gAudioTestSuccessCounterThreshold) {
+						gAudioTestSuccessCounter = 0;							
+						gAudioTestStateSampleCount = 0;
+						gAudioTestState = kStateTestingAudioDone;
+					}
+				}
+				else {
+					if(!((context->audioSampleCount + n) % 22050)) {
+						// Debugging print messages
+						if((gPositivePeakLevels[1] - gNegativePeakLevels[1]) < gPeakLevelHighThreshold)
+							rt_printf("Right Audio In FAIL: insufficient signal: %f\n", 
+										gPositivePeakLevels[1] - gNegativePeakLevels[1]);
+						else if(gPositivePeakLevels[0] -  gNegativePeakLevels[0] > gPeakLevelLowThreshold)
+							rt_printf("Left Audio In FAIL: signal present when it should not be: %f\n",
+										gPositivePeakLevels[0] -  gNegativePeakLevels[0]);
+						else if(fabsf(gPositivePeakLevels[0]) >= gDCOffsetThreshold ||
+								fabsf(gNegativePeakLevels[0]) >= gDCOffsetThreshold)
+							rt_printf("Left Audio In FAIL: DC offset: (%f, %f)\n",
+										gPositivePeakLevels[0], gNegativePeakLevels[0]);						
+					}
+					gAudioTestSuccessCounter--;
+					if(gAudioTestSuccessCounter <= 0)
+						gAudioTestSuccessCounter = 0;
+				}
+			}			
+		}
+		else {
+			// Audio input testing finished. Play tones depending on status of
+			// analog testing
+			context->audioOut[2*n] = gEnvelopeValueL * sinf(phase);
+			context->audioOut[2*n + 1] = gEnvelopeValueR * sinf(phase);
+
+			// If one second has gone by with no error, play one sound, else
+			// play another
+			if(context->audioSampleCount + n - gLastErrorFrame > 44100) {
+				gEnvelopeValueL *= gEnvelopeDecayRate;
+				gEnvelopeValueR *= gEnvelopeDecayRate;
+				gEnvelopeSampleCount++;
+				if(gEnvelopeSampleCount > 22050) {
+					if(gEnvelopeLastChannel == 0)
+						gEnvelopeValueR = 0.5;
+					else
+						gEnvelopeValueL = 0.5;
+					gEnvelopeLastChannel = !gEnvelopeLastChannel;
+					gEnvelopeSampleCount = 0;
+				}
+				frequency = 880.0;
+			}
+			else {
+				gEnvelopeValueL = gEnvelopeValueR = 0.5;
+				gEnvelopeLastChannel = 0;
+				frequency = 220.0;
+			}
+
+			phase += 2.0 * M_PI * frequency / 44100.0;
+			if(phase >= 2.0 * M_PI)
+				phase -= 2.0 * M_PI;
+		}
+	}
+
+	for(unsigned int n = 0; n < context->analogFrames; n++) {
+		// Change outputs every 512 samples
+		if(sampleCounter < 512) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel)
+					context->analogOut[n*8 + gDACPinOrder[k]] = ANALOG_HIGH;
+				else
+					context->analogOut[n*8 + gDACPinOrder[k]] = 0;
+			}
+		}
+		else {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel)
+					context->analogOut[n*8 + gDACPinOrder[k]] = 0;
+				else
+					context->analogOut[n*8 + gDACPinOrder[k]] = ANALOG_HIGH;
+			}
+		}
+
+		// Read after 256 samples: input should be low
+		if(sampleCounter == 256) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel) {
+					if(context->analogIn[n*8 + k] < ANALOG_HIGH) {
+						rt_printf("FAIL [output %d, input %d] -- output HIGH input %f (inverted)\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+				else {
+					if(context->analogIn[n*8 + k] > ANALOG_LOW) {
+						rt_printf("FAIL [output %d, input %d] -- output LOW --> input %f\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+			}
+		}
+		else if(sampleCounter == 768) {
+			for(int k = 0; k < 8; k++) {
+				if(k == invertChannel) {
+					if(context->analogIn[n*8 + k] > ANALOG_LOW) {
+						rt_printf("FAIL [output %d, input %d] -- output LOW input %f (inverted)\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+				else {
+					if(context->analogIn[n*8 + k] < ANALOG_HIGH) {
+						rt_printf("FAIL [output %d, input %d] -- output HIGH input %f\n", gDACPinOrder[k], k, context->analogIn[n*8 + k]);
+						gLastErrorFrame = context->audioSampleCount + n;
+					}
+				}
+			}
+		}
+
+		if(++sampleCounter >= 1024) {
+			sampleCounter = 0;
+			invertChannel++;
+			if(invertChannel >= 8)
+				invertChannel = 0;
+		}
+	}
+}
+
+// cleanup() is called once at the end, after the audio has stopped.
+// Release any resources that were allocated in setup().
+
+void cleanup(BeagleRTContext *context, void *userData)
+{
+
+}