annotate projects/scope/render.cpp @ 117:ada68d50e56a scope-refactoring

ReceiveAudioThread hs been ported to BBB. The scope project now is sending audio locally and receiving it at the same time

#include <BeagleRT.h> 
#include <NetworkSend.h>
#include <ReceiveAudioThread.h>
#include <cmath>

float gPhase1, gPhase2;
float gFrequency1, gFrequency2;
float gInverseSampleRate;

Scope scope(6);   //create a scope object with 6 channels
NetworkSend networkSend;

// initialise_render() 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.
ReceiveAudioThread receiveAudio;
bool setup(BeagleRTContext *context, void *userData)
{
	receiveAudio.bindToPort(9999);
	receiveAudio.init(context->audioFrames);
	scope.setup();  //call this once in setup to initialise the scope
//	networkSend.setup(context->audioSampleRate, 0, 9999, "192.168.7.1");
	 
	gInverseSampleRate = 1.0/context->audioSampleRate;
	
	gPhase1 = 0.0;
	gPhase2 = 0.0;
	
	gFrequency1 = 200.0;
	gFrequency2 = 201.0;

	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 int count=0;
	if(count==0)
		receiveAudio.startThread();

	for(unsigned int n = 0; n < context->audioFrames; n++) {
	    
		float chn0 = sinf(gPhase1);
	    float chn1 = sinf(gPhase2);

	    float chn2 = context->audioIn[n*2 + 0];
	    float chn3 = context->audioIn[n*2 + 1];

	    float chn4 = context->analogIn[(int)n/2*8 + 0];
	    float chn5 = context->analogIn[(int)n/2*8 + 1];
		scope.log(0, chn0);
		scope.log(1, chn1);
		scope.log(2, chn2);
		scope.log(3, chn3);
		scope.log(4, chn4);
		scope.log(5, chn5);
	    
//	    scope.log(chn1, chn2, chn3, chn4, chn5, chn6);
	    //call this once every audio frame
	    //takes six or fewer floats as parameters
	    //first parameter becomes channel 1 etc
	    //to view, click the 'oscilloscope' button on the toolbar while BeagleRT is NOT running
	    //then click the big red button on the toolbar on this page
	    
	    gPhase1 += 2.0 * M_PI * gFrequency1 * gInverseSampleRate * ((count&4095)/4096.0+1);
	    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>100)
		receiveAudio.getSamplesSrc(context->audioOut, context->audioFrames, 1);
	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)
{
    
}