giuliomoro@117: #include "ReceiveAudioThread.h"
giuliomoro@119: 
giuliomoro@119: #ifdef JUCE
giuliomoro@119: #else
giuliomoro@117: //initialise static members
giuliomoro@119: bool ReceiveAudioThread::staticConstructed=false;
giuliomoro@117: AuxiliaryTask ReceiveAudioThread::receiveDataTask=NULL;
giuliomoro@119: std::vector<ReceiveAudioThread *> ReceiveAudioThread::objAddrs(0);
giuliomoro@119: bool ReceiveAudioThread::threadRunning;
giuliomoro@119: bool ReceiveAudioThread::threadIsExiting;
giuliomoro@119: int ReceiveAudioThread::sleepTime;
giuliomoro@119: 
giuliomoro@119: void receiveData(){
giuliomoro@119: 	ReceiveAudioThread::run();
giuliomoro@119: }
giuliomoro@119: void ReceiveAudioThread::staticConstructor(){
giuliomoro@119: 	if(staticConstructed==true)
giuliomoro@119: 		return;
giuliomoro@119: 	staticConstructed=true;
giuliomoro@119:     threadIsExiting=false;
giuliomoro@119: 	receiveDataTask=BeagleRT_createAuxiliaryTask(receiveData, 90, "receiveDataTask"); //TODO: allow different priorities
giuliomoro@119: }
giuliomoro@119: #endif
giuliomoro@117: 
giuliomoro@117: void ReceiveAudioThread::dealloc(){
giuliomoro@117:     free(buffer);
giuliomoro@117:     buffer=NULL;
giuliomoro@117:     free(stackBuffer);
giuliomoro@117:     stackBuffer=NULL;
giuliomoro@117: }
giuliomoro@117: void ReceiveAudioThread::wrapWritePointer(){
giuliomoro@117:     //this is not quite a simple wrapping as you wold in a circular buffer,
giuliomoro@117:     //as there is no guarantee the buffer will be full at all times, given that there must alwas be enough space at the end of it
giuliomoro@117:     //to hold a full payload
giuliomoro@117:     // lastValidPointer indicates the last pointer in the buffer containing valid data
giuliomoro@117:     //
giuliomoro@117:     if(writePointer+payloadLength+headerLength>bufferLength){ //if we are going to exceed the length of the buffer with the next reading
giuliomoro@117:         //  lastValidPointer=writePointer+headerLength; //remember where the last valid data are
giuliomoro@117:         //  for(int n=headerLength;n<lastValidPointer; n++){
giuliomoro@117:             //  fprintf(fd2, "%f\n",buffer[n]); //DEBUG
giuliomoro@117:         //  }
giuliomoro@117:         writePointer=0; //and reset to beginning of the buffer
giuliomoro@117:     }
giuliomoro@117: }
giuliomoro@117: void ReceiveAudioThread::pushPayload(int startIndex){ //backup the payload samples that will be overwritten by the new header
giuliomoro@117:     for(int n=0; n<headerLength; n++){
giuliomoro@117:         stackBuffer[n]=buffer[startIndex+n];
giuliomoro@117:     }
giuliomoro@117: }
giuliomoro@117: void ReceiveAudioThread::popPayload(int startIndex){
giuliomoro@117:     for(int n=0; n<headerLength; n++){
giuliomoro@117:         buffer[startIndex+n]=stackBuffer[n];
giuliomoro@117:     }        
giuliomoro@117: }
giuliomoro@117: 
giuliomoro@117: int ReceiveAudioThread::readUdpToBuffer(){
giuliomoro@117:     if(listening==false || bufferReady==false)
giuliomoro@117:         return 0;
giuliomoro@117:     if(writePointer<0)
giuliomoro@117:         return 0;
giuliomoro@117:     if(1){ //TODO: implement waitUntilReady for UdpServer
giuliomoro@117: //JUCE    if(socket.waitUntilReady(true, waitForSocketTime)){ // waitForSocketTime could have been set to -1 (wait forever),
giuliomoro@117:                                                         // but it would have made it more difficult for the thread to be killed
giuliomoro@117:         pushPayload(writePointer); //backup headerLength samples. This could be skipped if writePointer==0
giuliomoro@117:         //read header+payload
giuliomoro@117: //JUCE        int numBytes=socket.read(buffer+writePointer, bytesToRead,1);
giuliomoro@117:         int numBytes=socket.read(buffer+writePointer, bytesToRead);
giuliomoro@117:             //TODO: (if using variable-length payload) validate the actual numBytes read against the size declared in the header
giuliomoro@117:         if(numBytes<0){
giuliomoro@117:             printf("error numBytes1\n");
giuliomoro@117:             return -3; //TODO: something went wrong, you have to discard the rest of the packet!
giuliomoro@117:         }
giuliomoro@117:         if(numBytes==0){//TODO: when inplementing waitUntilReady, this should not happen unless you actually receive a packate of size zero (is it at all possible?)
giuliomoro@117: //        	printf("received 0 bytes\n");
giuliomoro@117:         	return 0;
giuliomoro@117:         }
giuliomoro@119:         if(numBytes != bytesToRead){ //this is equivalent to (numBytes<bytesToRead)
giuliomoro@117:             printf("error numBytes2: %d\n", numBytes);
giuliomoro@117:             return -4; //TODO: something went wrong, less bytes than expected in the payload.
giuliomoro@117:         }
giuliomoro@119:         if(channel!=(int)buffer[writePointer]){
giuliomoro@119: //        	printf("I am channel %d, but I received data for channel %d\n", channel, (int)buffer[writePointer]);
giuliomoro@119:         	return -5;
giuliomoro@119:         }
giuliomoro@119: 		//TODO: do something else with the data in the header (e.g.: check that timestamp is sequential)
giuliomoro@119: //        rt_printf("Received a message of length %d, it was on channel %d and timestamp %d\n", numBytes, (int)buffer[writePointer], (int)buffer[writePointer+1]);
giuliomoro@117:         popPayload(writePointer); //restore headerLength payload samples. This could be skipped if writePointer==0
giuliomoro@117: 
giuliomoro@117:         //even though we just wrote (payloadLength+headerLength) samples in the buffer,
giuliomoro@117:         //we only increment by payloadLength. This way, next time a socket.read is performed, we will
giuliomoro@117:         //backup the last headerLength samples that we just wrote and we will overwrite them with
giuliomoro@117:         //the header from the new read. After parsing the header we will then restore the backed up samples.
giuliomoro@117:         //This way we guarantee that, apart from the first headerLength samples, buffer is a circular buffer!
giuliomoro@119: //        printf("writepointer:%d\n", writePointer);
giuliomoro@117:         writePointer+=payloadLength;
giuliomoro@117: 
giuliomoro@117:         if(writePointer>lastValidPointer){
giuliomoro@117:             //  lastValidPointer=writePointer+headerLength;
giuliomoro@117:         }
giuliomoro@117:         wrapWritePointer();
giuliomoro@117:         return numBytes;
giuliomoro@117:     }
giuliomoro@117:     return 0; //timeout occurred
giuliomoro@117: }
giuliomoro@117: ReceiveAudioThread::ReceiveAudioThread() :
giuliomoro@117: //JUCE    Thread(threadName),
giuliomoro@117:     socket(0),
giuliomoro@117:     listening(false),
giuliomoro@117:     bufferReady(false),
giuliomoro@117:     buffer(NULL),
giuliomoro@117:     stackBuffer(NULL),
giuliomoro@117:     bufferLength(0),
giuliomoro@117:     lastValidPointer(0),
giuliomoro@117:     waitForSocketTime(100),
giuliomoro@117:     threadPriority(95)
giuliomoro@117: {};
giuliomoro@117: ReceiveAudioThread::~ReceiveAudioThread(){
giuliomoro@117: //JUCE    stopThread(1000);
giuliomoro@117: 	while(threadRunning){
giuliomoro@119: 		usleep(sleepTime*2);	//wait for thread to stop
giuliomoro@117: 		std::cout<< "Waiting for receiveAudioTask to stop" << std::endl;
giuliomoro@117: 	}
giuliomoro@117: 	//TODO: check if thread stopped, otherwise kill it before dealloc
giuliomoro@117:     dealloc();
giuliomoro@117: }
giuliomoro@119: void ReceiveAudioThread::init(int aPort, int aSamplesPerBlock, int aChannel){
giuliomoro@117:   dealloc();
giuliomoro@119: #ifdef JUCE
giuliomoro@119: #else
giuliomoro@119:   staticConstructor();
giuliomoro@119:   objAddrs.push_back(this);//TODO: this line should be in the constructor
giuliomoro@119: #endif
giuliomoro@119:   bindToPort(aPort);
giuliomoro@119:   channel=aChannel;
giuliomoro@120:   printf("Channel %d is receiving on port %d\n",aChannel, aPort);
giuliomoro@117:   //  fd=fopen("output.m","w"); //DEBUG
giuliomoro@117:   //  fprintf(fd,"var=["); //DEBUG
giuliomoro@117:   headerLength=2;
giuliomoro@117:   payloadLength=300; //TODO: make sure that payloadLength and headerLength are the same as the client is sending.
giuliomoro@117:   bufferLength=std::max(headerLength+(payloadLength*4), headerLength+(aSamplesPerBlock*4)); //there are many considerations that can be done here ...
giuliomoro@117:                       //We keep a headerLength padding at the beginning of the array to allow full reads from the socket
giuliomoro@117:   buffer=(float*)malloc(sizeof(float)*bufferLength);
giuliomoro@117:   if(buffer==NULL) // something wrong
giuliomoro@117:     return;
giuliomoro@117:   bufferReady=true;
giuliomoro@117:   lastValidPointer=headerLength+ ((bufferLength-headerLength)/payloadLength)*payloadLength;
giuliomoro@117:   memset(buffer,0,bufferLength*sizeof(float));
giuliomoro@117:   stackBuffer=(float*)malloc(sizeof(float)*headerLength);
giuliomoro@117:   bytesToRead=sizeof(float)*(payloadLength + headerLength);
giuliomoro@117:   writePointer=-1;
giuliomoro@120:   readPointer=0;
giuliomoro@117:   sleepTime=payloadLength/(float)44100 /4.0; //set sleepTime so that you do not check too often or too infrequently
giuliomoro@117: //JUCE    startThread(threadPriority);
giuliomoro@117: }
giuliomoro@117: 
giuliomoro@117: void ReceiveAudioThread::bindToPort(int aPort){
giuliomoro@117:     listening=socket.bindToPort(aPort);
giuliomoro@119: #ifdef JUCE
giuliomoro@119: #else
giuliomoro@119:     if(listening==false)
giuliomoro@119:     	printf("Could not bind to port %d\n",aPort);
giuliomoro@119: #endif
giuliomoro@117: }
giuliomoro@117: bool ReceiveAudioThread::isListening(){
giuliomoro@117:     return listening;
giuliomoro@117: }
giuliomoro@117: float* ReceiveAudioThread::getCurrentBuffer(int length){ // NOTE: this cannot work all the time unless samplesPerBuffer and payloadLength are multiples
giuliomoro@117:     //TODO: make it return the number of samples actually available at the specified location
giuliomoro@117:     if(isListening()==false || length>bufferLength)
giuliomoro@117:         return NULL;
giuliomoro@117:     readPointer+=length;
giuliomoro@117:     if(readPointer>lastValidPointer){
giuliomoro@117:         readPointer=headerLength;
giuliomoro@117:     }
giuliomoro@117:     return buffer+(int)readPointer;
giuliomoro@117: };
giuliomoro@120: int ReceiveAudioThread::getSamplesSrc(float *destination, int length,
giuliomoro@120: 		float samplingRateRatio, int numChannelsInDestination,
giuliomoro@120: 		int channelToWriteTo)
giuliomoro@120: {
giuliomoro@117:     if (!(samplingRateRatio>0 && samplingRateRatio<=2))
giuliomoro@117:         return -2;
giuliomoro@117:     if(isListening()==false)
giuliomoro@117:         return -1;
giuliomoro@117:     if(writePointer<0){ //if writePointer has not been initalized yet ...
giuliomoro@117:         writePointer=2*length;  // do it, so that it starts writing at a safety margin from where we write.
giuliomoro@117:                             // This will help keeping them in sync.
giuliomoro@117:                             //TODO: handle what happens when the remote stream is interrupted and then restarted
giuliomoro@117:     }
giuliomoro@117:     if(length>lastValidPointer) { 
giuliomoro@117:         //not enough samples available, we fill the buffer with what is available, but the destination buffer will not be filled completely
giuliomoro@117:         //at this very moment the other thread might be writing at most one payload into the buffer.
giuliomoro@117:         //To avoid a race condition, we need to let alone the buffer where we are currently writing
giuliomoro@117:         //as writing the payload also temporarily overwrites the previous headerLength samples, we need to account for them as well
giuliomoro@117:         //TODO: This assumes that the writePointer and readPointer do not drift. When doing clock synchronization we will find out that it is not true!
giuliomoro@117:         length=lastValidPointer-payloadLength-headerLength;
giuliomoro@117:         if(length<0) //no samples available at all! 
giuliomoro@117:             return 0;
giuliomoro@117:     }
giuliomoro@117:     for(int n=0; n<length; n++){
giuliomoro@120:         destination[n*numChannelsInDestination+channelToWriteTo]=buffer[(int)(0.5+readPointer)];//simple ZOH non-interpolation (nearest neighbour)
giuliomoro@117:         //  fprintf(fd,"%f, %d, %f;\n",readPointer,writePointer,destination[n]); //DEBUG
giuliomoro@117:         readPointer+=samplingRateRatio;
giuliomoro@117:         if((int)(0.5+readPointer)>=lastValidPointer){
giuliomoro@117:             readPointer=readPointer-lastValidPointer+headerLength;
giuliomoro@117:         }
giuliomoro@117:     }
giuliomoro@117:     return readPointer; 
giuliomoro@117: }
giuliomoro@120: int ReceiveAudioThread::getSamplesSrc(float *destination, int length, float samplingRateRatio){
giuliomoro@120: 	return getSamplesSrc(destination, length, samplingRateRatio, 1,0);
giuliomoro@120: 	// TODO: rewriting this so that it does not call the override method we can save a multiply and add
giuliomoro@120: 	// for each sample.
giuliomoro@120: }
giuliomoro@117: bool ReceiveAudioThread::isBufferReady(){
giuliomoro@117:     return bufferReady;
giuliomoro@117: }
giuliomoro@117: void ReceiveAudioThread::startThread(){
giuliomoro@117: 	BeagleRT_scheduleAuxiliaryTask(receiveDataTask);
giuliomoro@117: }
giuliomoro@117: void ReceiveAudioThread::stopThread(){
giuliomoro@117: 	threadIsExiting=true;
giuliomoro@117: }
giuliomoro@117: bool ReceiveAudioThread::threadShouldExit(){
giuliomoro@117: 	return(gShouldStop || threadIsExiting );
giuliomoro@117: }
giuliomoro@117: void ReceiveAudioThread::run(){
giuliomoro@117:     //  fd2=fopen("buffer.m","w"); //DEBUG
giuliomoro@117:     //  fprintf(fd2, "buf=["); //DEBUG
giuliomoro@117: 	threadRunning=true;
giuliomoro@117:     while(!threadShouldExit()){ //TODO: check that the socket buffer is empty before starting
giuliomoro@119: #ifdef JUCE
giuliomoro@117:         readUdpToBuffer(); // read into the oldBuffer
giuliomoro@117:         usleep(sleepTime);
giuliomoro@119: #else
giuliomoro@119: 		for(unsigned int n=0; n<ReceiveAudioThread::objAddrs.size(); n++){
giuliomoro@119: 			ReceiveAudioThread::objAddrs[n]->readUdpToBuffer();
giuliomoro@119: 		}
giuliomoro@119: 		usleep(sleepTime); //TODO: use rt_task_sleep instead
giuliomoro@119: #endif
giuliomoro@117:     }
giuliomoro@117:     threadRunning=false;
giuliomoro@117:     //  fprintf(fd,"];readPointer,writePointer,lastValidPointer,destination]=deal(var(:,1), var(:,2), var(:,3), var(:,4));"); //DEBUG
giuliomoro@117:     //  fclose(fd);//DEBUG
giuliomoro@117:     //  fprintf(fd2,"];");//DEBUG
giuliomoro@117:     //  fclose(fd2); //DEBUG
giuliomoro@117: }