private void Session_RDSFrameReceivedEvent(Framework.RDSCommand frame, RDSSession session)
{
//Get type
if (frame.GetType() != typeof(RadioTextRDSCommand))
{
return;
}
RadioTextRDSCommand cmd = (RadioTextRDSCommand)frame;
//Set if the clear flag has been changed
//http://www.interactive-radio-system.com/docs/EN50067_RDS_Standard.pdf defines that a screen clear should happen
if (_lastClearFlag != cmd.clear)
{
//Clear the buffer
for (var i = 0; i < textBuffer.Length; i++)
{
textBuffer[i] = (char)0x00;
}
//Set the buffer
_lastClearFlag = cmd.clear;
_firstChunkDecoded = false;
//Send event
RDSFeatureRadioText_RadioTextClearedUpdatedEvent?.Invoke();
}
else
{
//Set data in buffer
textBuffer[cmd.offset + 0] = cmd.letterA;
textBuffer[cmd.offset + 1] = cmd.letterB;
textBuffer[cmd.offset + 2] = cmd.letterC;
textBuffer[cmd.offset + 3] = cmd.letterD;
//Set chunk flag
if (cmd.offset == 0)
{
_firstChunkDecoded = true;
}
//Update final station name, if any
//http://www.interactive-radio-system.com/docs/EN50067_RDS_Standard.pdf defines that the final message must end with \r. We use that to determine when the message is fully written
if ((cmd.letterA == '\r' || cmd.letterB == '\r' || cmd.letterC == '\r' || cmd.letterD == '\r') && _firstChunkDecoded)
{
radioText = new string(textBuffer);
RDSFeatureRadioText_RadioTextUpdatedEvent?.Invoke(radioText);
}
}
//Send event
RDSFeatureRadioText_RadioTextBufferUpdatedEvent?.Invoke(textBuffer, cmd.offset, 4);
}
public static RDSCommand ReadRdsFrame(RdsFrame frame)
{
//Swap frame bits
ushort groupA = (ushort)((frame.GroupA >> 8) | (frame.GroupA << 8));
ushort groupB = (ushort)((frame.GroupB >> 8) | (frame.GroupB << 8));
ushort groupC = (ushort)((frame.GroupC >> 8) | (frame.GroupC << 8));
ushort groupD = (ushort)((frame.GroupD >> 8) | (frame.GroupD << 8));
//Decode params in block 2
RdsHeaderFrame header = DecodeGroupBHeader(groupB);
//Determine the RDSCommand to use
RDSCommand cmd;
switch (header.groupType)
{
case 0: cmd = new BasicDataRDSCommand(); break;
case 2: cmd = new RadioTextRDSCommand(); break;
default: cmd = new UnsupportedRDSCommand(); break;
}
//Set basic params on the command
cmd.programIdentificationCode = groupA;
cmd._header = header;
cmd._groupA = groupA;
cmd._groupB = groupB;
cmd._groupC = groupC;
cmd._groupD = groupD;
//Read the data
cmd.ReadCommand(header.specialData, groupC, groupD);
return(cmd);
}
