giuliomoro@230: /*
giuliomoro@230:  * render.cpp
giuliomoro@230:  *
giuliomoro@230:  *  Created on: Oct 24, 2014
giuliomoro@230:  *      Author: parallels
giuliomoro@230:  */
giuliomoro@230: 
giuliomoro@230: #include <BeagleRT.h>
giuliomoro@230: #include <cmath>
giuliomoro@230: #include <Utilities.h>
giuliomoro@230: #include <I2c_Codec.h>
giuliomoro@230: #include <PRU.h>
giuliomoro@230: #include <stdio.h>
giuliomoro@230: #include "z_libpd.h"
giuliomoro@230: #include <UdpServer.h>
giuliomoro@230: 
giuliomoro@230: // setup() is called once before the audio rendering starts.
giuliomoro@230: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@230: // on the period size or sample rate.
giuliomoro@230: //
giuliomoro@230: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@230: // in from the call to initAudio().
giuliomoro@230: //
giuliomoro@230: // Return true on success; returning false halts the program.
giuliomoro@230: #define DEFDACBLKSIZE 8u  //make sure this matches the one used to compile libpd
giuliomoro@230: 
giuliomoro@232: int gChannelsInUse = 10;
giuliomoro@230: int gBufLength;
giuliomoro@230: 
giuliomoro@230: float* gInBuf;
giuliomoro@230: float* gOutBuf;
giuliomoro@230: 
giuliomoro@230: void pdnoteon(int ch, int pitch, int vel) {
giuliomoro@230:   printf("noteon: %d %d %d\n", ch, pitch, vel);
giuliomoro@230: }
giuliomoro@230: 
giuliomoro@230: void BeagleRT_printHook(const char *recv){
giuliomoro@230: 	rt_printf("%s", recv);
giuliomoro@230: }
giuliomoro@230: 
giuliomoro@230: UdpServer udpServer;
giuliomoro@230: 
giuliomoro@230: void udpRead(){
giuliomoro@230:     char dest[100] = {0};
giuliomoro@230:     while(!gShouldStop){
giuliomoro@230:     	libpd_sys_microsleep(0);
giuliomoro@230:         usleep(1000);
giuliomoro@230:     }
giuliomoro@230: }
giuliomoro@230: 
giuliomoro@230: AuxiliaryTask  udpReadTask;
giuliomoro@230: bool setup(BeagleRTContext *context, void *userData)
giuliomoro@230: {
giuliomoro@232: 	gChannelsInUse = min((int)(context->analogChannels+context->audioChannels), (int)gChannelsInUse);
giuliomoro@230: 	udpServer.bindToPort(1234);
giuliomoro@230: 
giuliomoro@230: 	// check that we are not running with a blocksize smaller than DEFDACBLKSIZE
giuliomoro@230: 	// it would still work, but the load would be executed unevenly between calls to render
giuliomoro@230: 	if(context->audioFrames < DEFDACBLKSIZE){
giuliomoro@230: 		fprintf(stderr, "Error: minimum block size must be %d\n", DEFDACBLKSIZE);
giuliomoro@230: 		return false;
giuliomoro@230: 	}
giuliomoro@230: 
giuliomoro@230: 	// check that the sampling rate of the analogs is the same as audio if running with
giuliomoro@230: 	// more than 2 channels (that is with analog). If we fix the TODO in render, then
giuliomoro@230: 	// this test is not needed.
giuliomoro@232: //	if(context->analogFrames != context->audioFrames){
giuliomoro@232: //		fprintf(stderr, "Error: analog and audio sampling rates must be the same\n");
giuliomoro@232: //		return false;
giuliomoro@232: //	}
giuliomoro@230: 	//following lines borrowed from libpd/samples/c/pdtest/pdtest.c
giuliomoro@230: 	// init pd
giuliomoro@230: 	libpd_set_printhook(BeagleRT_printHook); // set this before calling libpd_init
giuliomoro@230: 	libpd_set_noteonhook(pdnoteon);
giuliomoro@230: 	libpd_init();
giuliomoro@230: 	//TODO: analyse the ASCII of the patch file and find the in/outs to use
giuliomoro@230: 	libpd_init_audio(gChannelsInUse, gChannelsInUse, context->audioSampleRate);
giuliomoro@230: 
giuliomoro@230: 	libpd_start_message(1); // one entry in list
giuliomoro@230: 	libpd_add_float(1.0f);
giuliomoro@230: 	libpd_finish_message("pd", "dsp");
giuliomoro@230: 
giuliomoro@230: 	gBufLength = max(DEFDACBLKSIZE, context->audioFrames);
giuliomoro@230: 	unsigned int bufferSize = sizeof(float)*gChannelsInUse*gBufLength;
giuliomoro@230: 	gInBuf = (float*)malloc(bufferSize);
giuliomoro@230: 	gOutBuf = (float*)malloc(bufferSize);
giuliomoro@230: 	// no need to memset to zero
giuliomoro@230: 
giuliomoro@230: 	char file[] = "_main.pd";
giuliomoro@230: 	char folder[] = "./";
giuliomoro@230: 	// open patch       [; pd open file folder(
giuliomoro@230: 	libpd_openfile(file, folder);
giuliomoro@230:     
giuliomoro@230: 	udpReadTask = BeagleRT_createAuxiliaryTask(udpRead, 60, "udpReadTask");
giuliomoro@230: 	BeagleRT_scheduleAuxiliaryTask(udpReadTask);
giuliomoro@230: 	return true;
giuliomoro@230: }
giuliomoro@230: 
giuliomoro@230: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@230: // Input and output are given from the audio hardware and the other
giuliomoro@230: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
giuliomoro@230: // will be 0.
giuliomoro@230: BeagleRTContext *c;
giuliomoro@230: void render(BeagleRTContext *context, void *userData)
giuliomoro@230: {
giuliomoro@230: 	static int inW = 0;
giuliomoro@230: 	static int outR = 0;
giuliomoro@230: /*
giuliomoro@230:  *	NOTE: if you are only using audio (or only analogs) and you are using interleaved buffers
giuliomoro@230:  *	 and the blocksize of Bela is the same as DEFDACBLKSIZE, then you probably
giuliomoro@230:  *	 do not need the for loops before and after libpd_process_float, so you can save quite some
giuliomoro@230:  *	 memory operations.
giuliomoro@230:  */
giuliomoro@232: 	static int analogChannelsInUse = min(context->analogChannels, gChannelsInUse - context->audioChannels);
giuliomoro@232: 	// rt_printf("channelsInUse: %d, analogChannels in Use: %d\n", gChannelsInUse, analogChannelsInUse);
giuliomoro@232: 	for(unsigned int n = 0; n < context->audioFrames; ++n){ //pd buffers are interleaved
giuliomoro@232: 		for(unsigned int ch = 0; ch < context->audioChannels; ++ch){ //first two channels are audio
giuliomoro@232: 			gInBuf[inW++] = audioReadFrame(context, n, ch);
giuliomoro@230: 		}
giuliomoro@232: 		// then analogs
giuliomoro@232: 		// this loop resamples by ZOH, as needed, using m
giuliomoro@232: 		if(context->analogChannels == 8 ){ //hold the value for two frames
giuliomoro@232: 			for(int analogCh = 0; analogCh < analogChannelsInUse; ++analogCh){
giuliomoro@232: 				gInBuf[inW++] = analogReadFrame(context, n/2, analogCh); // n/2 wil be the same for n and n+1 when n is even
giuliomoro@232: 			}
giuliomoro@232: 		} else if(context->analogChannels == 4){ //write every frame
giuliomoro@232: 			for(int analogCh = 0; analogCh < analogChannelsInUse; ++analogCh){
giuliomoro@232: 				gInBuf[inW++] = analogReadFrame(context, n, analogCh);
giuliomoro@232: 			}
giuliomoro@232: 		} else if(context->analogChannels == 2){ //drop every other frame
giuliomoro@232: 			for(int analogCh = 0; analogCh < analogChannelsInUse; ++analogCh){
giuliomoro@232: 				gInBuf[inW++] = analogReadFrame(context, n*2, analogCh);
giuliomoro@232: 			}
giuliomoro@230: 		}
giuliomoro@230: 		if(inW == gBufLength * gChannelsInUse){
giuliomoro@230: 			inW = 0;
giuliomoro@230: 		}
giuliomoro@230: 	}
giuliomoro@232: 	// rt_printf("inW %d\n", inW);
giuliomoro@230: 	if(inW == 0){ //if the buffer is full, process it
giuliomoro@232: 		static int numberOfPdBlocksToProcess = gBufLength/DEFDACBLKSIZE;
giuliomoro@230: 		libpd_process_float(numberOfPdBlocksToProcess, gInBuf, gOutBuf);
giuliomoro@232: 		outR = 0; // reset the read pointer. NOTE: hopefully this is needed only the first time
giuliomoro@230: 	}
giuliomoro@230: 
giuliomoro@230: 	for(unsigned int n = 0; n < context->audioFrames; n++){ //pd buffers are interleaved
giuliomoro@232: 		for(unsigned int ch = 0; ch < context->audioChannels; ++ch){
giuliomoro@232: 			audioWriteFrame(context, n, ch, gOutBuf[outR++]);
giuliomoro@230: 		}
giuliomoro@232: 		//and analogs
giuliomoro@232: 		if(context->analogChannels == 8){
giuliomoro@232: 			for(unsigned int analogCh = 0; analogCh < analogChannelsInUse; ++analogCh){
giuliomoro@232: 				float analogOut = gOutBuf[outR++];				
giuliomoro@232: 				if((n&1) == 0){//write every two frames
giuliomoro@232: 					analogWriteFrame(context, n/2, analogCh, analogOut);
giuliomoro@232: 				} else {
giuliomoro@232: 					// discard this sample
giuliomoro@232: 				}
giuliomoro@232: 			}
giuliomoro@232: 		} else if(context->analogChannels == 4){ //write every frame
giuliomoro@232: 			for(int analogCh = 0; analogCh < analogChannelsInUse; ++analogCh){
giuliomoro@232: 				float analogOut = gOutBuf[outR++];
giuliomoro@232: 				analogWriteFrame(context, n, analogCh, analogOut);
giuliomoro@232: 			}
giuliomoro@232: 		} else if(context->analogChannels == 2){ //write twice every frame
giuliomoro@232: 			for(unsigned int analogCh = 0; analogCh < analogChannelsInUse; ++analogCh){
giuliomoro@232: 				float analogOut = gOutBuf[outR++];
giuliomoro@232: 				analogWriteFrame(context, 2*n, analogCh, analogOut);
giuliomoro@232: 				analogWriteFrame(context, 2*n + 1, analogCh, analogOut);
giuliomoro@232: 			}
giuliomoro@230: 		}
giuliomoro@230: 		if(outR == gBufLength * gChannelsInUse){
giuliomoro@230: 			outR = 0;
giuliomoro@230: 		}
giuliomoro@230: 	}
giuliomoro@232: 	// rt_printf("outR %d, analogChannelsInUse %d, channelsInUse %d\n", 
giuliomoro@232: 	// 	outR , analogChannelsInUse, gChannelsInUse);
giuliomoro@230: }
giuliomoro@232: 
giuliomoro@230: // cleanup() is called once at the end, after the audio has stopped.
giuliomoro@230: // Release any resources that were allocated in setup().
giuliomoro@230: 
giuliomoro@230: void cleanup(BeagleRTContext *context, void *userData)
giuliomoro@230: {
giuliomoro@230: 	free(gInBuf);
giuliomoro@230: 	free(gOutBuf);
giuliomoro@230: }