belaplatform / bela-online-course Goto Github PK

#include <Bela.h>
#include <vector>
#include "MonoFilePlayer.h"

// Name of the sound file (in project folder)
std::string gFilename = "slow-drum-loop.wav";

// Object that handles playing sound from a buffer
MonoFilePlayer gPlayer;

// TODO: declare variables for circular buffer
std::vector<float> gDelayBuffer;
unsigned int gWritePointer = 0;

bool setup(BelaContext *context, void *userData)
{
	// Load the audio file
	if(!gPlayer.setup(gFilename)) {
    	rt_printf("Error loading audio file '%s'\n", gFilename.c_str());
    	return false;
	}

	// Print some useful info
    rt_printf("Loaded the audio file '%s' with %d frames (%.1f seconds)\n", 
    			gFilename.c_str(), gPlayer.size(),
    			gPlayer.size() / context->audioSampleRate);
	gDelayBuffer.resize(0.5 * context->audioSampleRate);
	rt_printf("DelayBuffer is %d samples long\n", gDelayBuffer.size());
	return true;
}

void render(BelaContext *context, void *userData)
{
    for(unsigned int n = 0; n < context->audioFrames; n++) {
        float in = gPlayer.process();
      
    	// TODO: your circular buffer code goes here
    	float out = gDelayBuffer[gWritePointer];
    	
    	gDelayBuffer[gWritePointer] = in;
    	
    	gWritePointer++;
        if(gWritePointer >= gDelayBuffer.size());
        	gWritePointer = 0;
        
		// Write the input and output to different channels
    	audioWrite(context, n, 0, in);
    	audioWrite(context, n, 1, out);
    }
}