comparison projects/basic_writeFile/render.cpp @ 153:3b7270949a97

Added WriteFile class to log data to disc in a low priority thread

+#include <BeagleRT.h> 
+#include <Scope.h>
+#include <cmath>
+#include <WriteFile.h>
+
+float gPhase1, gPhase2;
+float gFrequency1, gFrequency2;
+float gInverseSampleRate;
+
+WriteFile file1;
+WriteFile file2;
+
+bool setup(BeagleRTContext *context, void *userData)
+{
+	gInverseSampleRate = 1.0/context->audioSampleRate;
+	file1.init("out1.m"); //set the file name to write to
+	file1.setHeader("myvar=[\n"); //set a line to be printed at the beginning of the file
+	file1.setFooter("];\n"); //set a line to be printed at the end of the file
+	file1.setEcho(true); // enable echo to the console (as well as to the file)
+	file1.setFormat("%.5f %.10f %f\n"); // set the format that you want to use for your output. Please use %f only (with modifiers)
+	file2.init("out2.m");
+	file2.setHeader("input=[\n");
+	file2.setFooter("];\n");
+	file2.setEcho(false);
+	file2.setFormat("%f\n");
+	gPhase1 = 0.0;
+	gPhase2 = 0.0;
+
+	gFrequency1 = 200.0;
+	gFrequency2 = 201.0;
+	return true; 
+}
+
+void render(BeagleRTContext *context, void *userData)
+{
+	static int count = 0;
+	if((count&16383) == 0){
+    	file2.log(context->audioIn, context->audioFrames); //write the input buffer every so often
+	}
+	for(unsigned int n = 0; n < context->audioFrames; n++) {
+	    float chn1 = sinf(gPhase1);
+	    float chn2 = sinf(gPhase2);
+	    gPhase1 += 2.0 * M_PI * gFrequency1 * gInverseSampleRate;
+	    gPhase2 += 2.0 * M_PI * gFrequency2 * gInverseSampleRate;
+		if(gPhase1 > 2.0 * M_PI)
+			gPhase1 -= 2.0 * M_PI;
+		if(gPhase2 > 2.0 * M_PI)
+			gPhase2 -= 2.0 * M_PI;
+		if( (count&511) == 0){
+			file1.log(chn1);
+			file1.log(chn2);
+			file1.log(count);
+		}
+		count++;
+	}
+}
+
+// cleanup_render() is called once at the end, after the audio has stopped.
+// Release any resources that were allocated in initialise_render().
+
+void cleanup(BeagleRTContext *context, void *userData)
+{
+    
+}