// Runs on a SECONDARY thread
@Override
public void processFrame(android.media.audiofx.Visualizer visualizer, boolean playing) {
if (!lock.lockLowPriority()) return;
try {
if (transmitting) {
// We use ignoreInput, because sampling 1024, 60 times a seconds,
// is useless, as there are only 44100 or 48000 samples in one second
if (ignoreInput == 0) {
// WE MUST NEVER call any method from visualizer
// while the player is not actually playing
if (!playing) Arrays.fill(waveform, 0, 1024, (byte) 0x80);
else visualizer.getWaveForm(waveform);
}
if (framesToSkip <= 0) {
framesToSkip = framesToSkipOriginal;
bt.getOutputStream()
.write(
waveform,
0,
SimpleVisualizerJni.commonProcess(waveform, size | ignoreInput | dataType));
packetsSent++;
} else {
SimpleVisualizerJni.commonProcess(waveform, ignoreInput | dataType);
framesToSkip--;
}
ignoreInput ^= IGNORE_INPUT;
}
int stateI = state.getAndSet(0);
if (stateI != 0) {
// Build and send a Player state message
waveform[0] = StartOfHeading;
waveform[1] = (byte) MessagePlayerState;
waveform[3] = 0;
int len = 0;
len = writeByte(waveform, len, stateI & 3);
len = writeByte(waveform, len, stateVolume);
stateI = stateSongPosition;
len = writeByte(waveform, len, stateI);
len = writeByte(waveform, len, stateI >> 8);
len = writeByte(waveform, len, stateI >> 16);
len = writeByte(waveform, len, stateI >> 24);
stateI = stateSongLength;
len = writeByte(waveform, len, stateI);
len = writeByte(waveform, len, stateI >> 8);
len = writeByte(waveform, len, stateI >> 16);
len = writeByte(waveform, len, stateI >> 24);
waveform[2] = (byte) (len << 1);
waveform[4 + len] = EndOfTransmission;
bt.getOutputStream().write(waveform, 0, len + 5);
packetsSent++;
}
} catch (IOException ex) {
// Bluetooth error
if (connected) MainHandler.sendMessage(this, MSG_BLUETOOTH_RXTX_ERROR);
} catch (Throwable ex) {
ex.printStackTrace();
} finally {
lock.releaseLowPriority();
}
}
@Override
public void run() {
final int myVersion = version;
try {
final InputStream inputStream = bt.getInputStream();
int state = 0, payloadLength = 0, payload = 0, currentMessage = 0;
while (connected && myVersion == version) {
final int data = inputStream.read();
if (data == StartOfHeading) {
// Restart the state machine
state &= (~(FlagEscape | FlagState));
continue;
}
switch ((state & FlagState)) {
case 0:
// This byte should be the message type
switch (data) {
case MessageStartBinTransmission:
case MessageStopBinTransmission:
case MessagePlayerCommand:
// Take the state machine to its next state
currentMessage = data;
state++;
continue;
default:
// Take the state machine to its error state
state |= FlagState;
continue;
}
case 1:
// This should be payload length's first byte
// (bits 0 - 6 left shifted by 1)
if ((data & 0x01) != 0) {
// Take the state machine to its error state
state |= FlagState;
} else {
payloadLength = data >> 1;
// Take the state machine to its next state
state++;
}
continue;
case 2:
// This should be payload length's second byte
// (bits 7 - 13 left shifted by 1)
if ((data & 0x01) != 0) {
// Take the state machine to its error state
state |= FlagState;
} else {
payloadLength |= (data << 6);
if (currentMessage == MessageStopBinTransmission) {
if (payloadLength != 0) {
// Take the state machine to its error state
state |= FlagState;
continue;
}
// Skip two states as this message has no payload
state += 2;
} else {
if (payloadLength != 1) {
if (currentMessage != MessagePlayerCommand || payloadLength != 2) {
// Take the state machine to its error state
state |= FlagState;
continue;
}
}
// Take the state machine to its next state
state++;
payload = 0;
}
}
continue;
case 3:
// We are receiving the payload
if (data == Escape) {
// Until this date, the only payloads which are
// valid for reception do not include escapable bytes...
// Take the state machine to its error state
state |= FlagState;
continue;
}
if (currentMessage == MessagePlayerCommand) {
payload = (payload << 8) | data;
payloadLength--;
// Keep the machine in state 3
if (payloadLength > 0) continue;
} else {
payload = data;
}
// For now, the only payload received is 1 byte long
state++;
continue;
case 4:
// Take the state machine to its error state
state |= FlagState;
// Sanity check: data should be EoT
if (data == EndOfTransmission)
// Message correctly received
MainHandler.sendMessage(this, MSG_PLAYER_COMMAND, currentMessage, payload);
}
}
} catch (IOException ex) {
// Bluetooth error
if (connected) MainHandler.sendMessage(this, MSG_BLUETOOTH_RXTX_ERROR);
} catch (Throwable ex) {
ex.printStackTrace();
}
}