write-file/render.cpp

Writing data to a file

This sketch demonstrates how to log values from within a project for later processing or analysis.

/*
 ____  _____ _        _    
| __ )| ____| |      / \   
|  _ \|  _| | |     / _ \  
| |_) | |___| |___ / ___ \ 
|____/|_____|_____/_/   \_\

The platform for ultra-low latency audio and sensor processing

http://bela.io

A project of the Augmented Instruments Laboratory within the
Centre for Digital Music at Queen Mary University of London.
http://www.eecs.qmul.ac.uk/~andrewm

(c) 2016 Augmented Instruments Laboratory: Andrew McPherson,
  Astrid Bin, Liam Donovan, Christian Heinrichs, Robert Jack,
  Giulio Moro, Laurel Pardue, Victor Zappi. All rights reserved.

The Bela software is distributed under the GNU Lesser General Public License
(LGPL 3.0), available here: https://www.gnu.org/licenses/lgpl-3.0.txt
*/


#include <Bela.h> 
#include <cmath>
#include <WriteFile.h>

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

WriteFile file1;
WriteFile file2;

bool setup(BelaContext *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(BelaContext *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(BelaContext *context, void *userData)
{
    
}