diff core/Midi.cpp @ 191:b3a306da03e0

Implemented Midi output

--- a/core/Midi.cpp	Tue Jan 26 00:02:15 2016 +0000
+++ b/core/Midi.cpp	Wed Feb 03 01:18:30 2016 +0000
@@ -9,16 +9,20 @@
 #include <fcntl.h>
 #include <errno.h>
 
+#define kMidiInput 0
+#define kMidiOutput 1
+
 bool Midi::staticConstructed;
 AuxiliaryTask Midi::midiInputTask;
 AuxiliaryTask Midi::midiOutputTask;
-std::vector<Midi *> Midi::objAddrs(0);
+std::vector<Midi *> Midi::objAddrs[2];
 
 Midi::Midi(){
 	outputPort = -1;
 	inputPort = -1;
 	size_t inputBytesInitialSize = 1000;
 	inputBytes.resize(inputBytesInitialSize);
+	outputBytes.resize(inputBytesInitialSize);
 	inputBytesWritePointer = 0;
 	inputBytesReadPointer = inputBytes.size() - 1;
 	if(!staticConstructed){
@@ -29,15 +33,21 @@
 void Midi::staticConstructor(){
 	staticConstructed = true;
 	midiInputTask = BeagleRT_createAuxiliaryTask(Midi::midiInputLoop, 50, "MidiInput");
-	midiOutputTask = BeagleRT_createAuxiliaryTask(Midi::midiInputLoop, 50, "MidiOutupt");
+	midiOutputTask = BeagleRT_createAuxiliaryTask(Midi::midiOutputLoop, 50, "MidiOutupt");
 }
 
 Midi::~Midi(){}
+void Midi::midiInputLoop(){
+	printf("Midi input loop %d\n", objAddrs[kMidiInput].size());
+	for(unsigned int n = 0; n < objAddrs[kMidiInput].size(); n++){
+		objAddrs[kMidiInput][n] -> readInputLoop();
+	}
+}
 
-void Midi::midiInputLoop(){
-	printf("Midi input loop %d\n", objAddrs.size());
-	for(unsigned int n = 0; n < objAddrs.size(); n++){
-		objAddrs[n] -> readInputLoop();
+void Midi::midiOutputLoop(){
+	printf("Midi output loop %d\n", objAddrs[kMidiOutput].size());
+	for(unsigned int n = 0; n < objAddrs[kMidiOutput].size(); n++){
+		objAddrs[kMidiOutput][n] -> writeOutputLoop();
 	}
 }
 
@@ -45,8 +55,6 @@
 	while(!gShouldStop){
 		int maxBytesToRead = inputBytes.size() - inputBytesWritePointer;
 		int ret = read(inputPort, &inputBytes[inputBytesWritePointer], sizeof(midi_byte_t)*maxBytesToRead);
-		static int count = 0;
-		count++;
 		if(ret < 0){
 			if(errno != EAGAIN){ // read() would return EAGAIN when no data are available to read just now
 				rt_printf("Error while reading midi %d\n", errno);
@@ -64,20 +72,63 @@
 	}
 }
 
+void Midi::writeOutputLoop(){
+	while(!gShouldStop){
+		usleep(1000);
+		int length = outputBytesWritePointer - outputBytesReadPointer;
+		if(length < 0){
+			length = outputBytes.size() - outputBytesReadPointer;
+		}
+		if(length == 0){ //nothing to be written
+			continue;
+		}
+		int ret;
+		ret = write(outputPort, &outputBytes[outputBytesReadPointer], sizeof(midi_byte_t)*length);
+		if(ret < 0){ //error occurred
+//			if(errno != EAGAIN){ // () would return EAGAIN when no data are available to read just now
+//				rt_printf("Error while writing midi %d\n", errno);
+//			}
+			rt_printf("error occurred while writing: %d\n", errno);
+			usleep(10000); //wait before retrying
+			continue;
+		}
+
+//		inputBytesWritePointer += ret;
+//		if(inputBytesWritePointer == inputBytes.size()){ //wrap pointer around
+//			inputBytesWritePointer = 0;
+//		}
+//		if(ret < maxBytesToRead){ //no more data to retrieve at the moment
+//			usleep(1000);
+//		} // otherwise there might be more data ready to be read, so don't sleep
+	}
+}
 int Midi::readFrom(int port){
-	objAddrs.push_back(this);
+	objAddrs[kMidiInput].push_back(this);
 	inputPort = open("/dev/midi1", O_RDONLY | O_NONBLOCK | O_NOCTTY);
 	if(inputPort < 0){
-		printf("Error occurred while opening midi port %d: %d", port, inputPort);
+		printf("Error occurred while opening midi input port %d: %d", port, inputPort);
 		return -1;
 	} else {
-		printf("Reading from port %d\n", inputPort);
+		printf("Reading from port %d\n", port);
 		BeagleRT_scheduleAuxiliaryTask(midiInputTask);
 		return 1;
 	}
 }
 
-int  Midi::getInput(){
+int Midi::writeTo(int port){
+	objAddrs[kMidiOutput].push_back(this);
+	outputPort = open("/dev/midi1", O_WRONLY, 0);
+	if(outputPort < 0){
+		printf("Error occurred while opening midi output port %d: %d", port, outputPort);
+		return -1;
+	} else {
+		printf("Writing to Midi port %d\n", port);
+		BeagleRT_scheduleAuxiliaryTask(midiOutputTask);
+		return 1;
+	}
+}
+
+int Midi::getInput(){
 	if(inputPort < 0)
 		return -2;
 	if(inputBytesReadPointer == inputBytesWritePointer){
@@ -89,3 +140,15 @@
 	}
 	return inputMessage;
 }
+
+int Midi::writeOutput(midi_byte_t byte){
+	return writeOutput(&byte, 1);
+}
+
+int Midi::writeOutput(midi_byte_t* bytes, unsigned int length){
+	int ret = write(outputPort, bytes, length);
+	if(ret < 0)
+		return -1;
+	else
+		return 1;
+}