annotate examples/05-Communication/basic-network/render.cpp @ 500:b935f890e512 prerelease

Updated Doxy to 1.8.11
Amended example titles in render.cpp and file locations in Doxy file.

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

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 <rtdk.h>
#include <cmath>
#include <NetworkSend.h>
#include <ReceiveAudioThread.h>
#include <Utilities.h>

// 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.

NetworkSend networkSend;
ReceiveAudioThread receive;
float gFrequency;
float gInverseSampleRate;
float gPhase;
bool setup(BelaContext *context, void *userData)
{
	// Retrieve a parameter passed in from the initAudio() call
	gFrequency = *(float *)userData;

	networkSend.setup(context->audioSampleRate, context->audioFrames, 0, 9999, "192.168.7.1");
	receive.init(10000, context->audioFrames, 0);
	receive.startThread();
	gInverseSampleRate = 1.0 / context->audioSampleRate;
	gPhase = 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(BelaContext *context, void *userData)
{
	for(unsigned int n = 0; n < context->audioFrames; n++) {
		float out = 0.7f * sinf(gPhase);
		gPhase += 2.0 * M_PI * gFrequency * gInverseSampleRate;
		if(gPhase > 2.0 * M_PI)
			gPhase -= 2.0 * M_PI;

		networkSend.log(out);
		float in;
		int ret = receive.getSamplesSrc(&in, 1, 1);
		for(unsigned int channel = 0; channel < context->audioChannels; channel++){
			audioWrite(context, n, channel, in);
		}
	}
}

// cleanup() is called once at the end, after the audio has stopped.
// Release any resources that were allocated in setup().

void cleanup(BelaContext *context, void *userData)
{
}

/* ------------ Project Explantation ------------ */

/**
\example basic-network/render.cpp

Networking 
----------

This sketch allows you to send audio and sensor data over UDP to a 
DAW on the host. The host needs to run Udpioplugin which you can find 
[here](https://code.soundsoftware.ac.uk/projects/udpioplugin). 

Note that this sketch and the accompanying plugin are still in testing.
*/