andrewm@13: /*
andrewm@13:  * render.cpp
andrewm@13:  *
andrewm@13:  *  Created on: Oct 24, 2014
andrewm@13:  *      Author: parallels
andrewm@13:  */
andrewm@13: 
andrewm@13: 
andrewm@56: #include <BeagleRT.h>
andrewm@56: #include <Utilities.h>
andrewm@13: #include <rtdk.h>
andrewm@13: 
andrewm@56: // setup() is called once before the audio rendering starts.
andrewm@13: // Use it to perform any initialisation and allocation which is dependent
andrewm@13: // on the period size or sample rate.
andrewm@13: //
andrewm@13: // userData holds an opaque pointer to a data structure that was passed
andrewm@13: // in from the call to initAudio().
andrewm@13: //
andrewm@13: // Return true on success; returning false halts the program.
andrewm@13: 
andrewm@56: bool setup(BeagleRTContext *context, void *userData)
andrewm@13: {
andrewm@13: 	// Nothing to do here...
andrewm@13: 
andrewm@13: 	return true;
andrewm@13: }
andrewm@13: 
andrewm@13: // render() is called regularly at the highest priority by the audio engine.
andrewm@13: // Input and output are given from the audio hardware and the other
andrewm@13: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
andrewm@13: // will be 0.
andrewm@13: 
andrewm@52: void render(BeagleRTContext *context, void *userData)
andrewm@13: {
andrewm@13: 	// Simplest possible case: pass inputs through to outputs
andrewm@52: 	for(unsigned int n = 0; n < context->audioFrames; n++) {
andrewm@52: 		for(unsigned int ch = 0; ch < context->audioChannels; ch++)
andrewm@52: 			context->audioOut[n * context->audioChannels + ch] = context->audioIn[n * context->audioChannels + ch];
andrewm@13: 	}
andrewm@13: 
andrewm@13: 	// Same with matrix, only if matrix is enabled
andrewm@52: 	if(context->analogFrames != 0) {
andrewm@52: 		for(unsigned int n = 0; n < context->analogFrames; n++) {
andrewm@52: 			for(unsigned int ch = 0; ch < context->analogChannels; ch++) {
andrewm@13: 				// Two equivalent ways to write this code
andrewm@13: 				// The long way, using the buffers directly:
andrewm@52: 				// context->analogOut[n * context->analogChannels + ch] = context->analogIn[n * context->analogChannels + ch];
andrewm@13: 
andrewm@13: 				// Or using the macros:
andrewm@52: 				analogWriteFrame(context, n, ch, analogReadFrame(context, n, ch));
andrewm@13: 			}
andrewm@13: 		}
andrewm@13: 	}
andrewm@13: }
andrewm@13: 
andrewm@56: // cleanup() is called once at the end, after the audio has stopped.
andrewm@56: // Release any resources that were allocated in setup().
andrewm@13: 
andrewm@56: void cleanup(BeagleRTContext *context, void *userData)
andrewm@13: {
andrewm@13: 
andrewm@13: }