/// <summary>
/// Processes a 2B "RadioText" frame type 0b00101
/// </summary>
/// <param name="frame"></param>
private void ProcessFramePayload_RadioTextB(RDSFrame frame)
{
//Read the header flags
bool flagAb = 1 == ((frame.b >> (HEADER_OFFSET - 0)) & 0b0000000000000001);
//Get the index and multiply it by 2, as that is the spacing
int addressIndex = (frame.b & 0b0000000000001111) * 2;
//Check if we should reset
if (flagAb != _rtLastAbFlag && addressIndex == 0)
{
//Clear buffer
for (int i = 0; i < rtBuffer.Length; i++)
{
rtBuffer[i] = (char)0x00;
}
//Update state
_rtLastAbFlag = flagAb;
//Send event
OnRtBufferCleared?.Invoke(this);
}
//Write all
rtBuffer[addressIndex + 0] = (char)((frame.d >> 8) & 0x00FF);
rtBuffer[addressIndex + 1] = (char)((frame.d >> 0) & 0x00FF);
//Search this string to see if we reached the end
int endIndex = -1;
for (int i = addressIndex; i < addressIndex + 4; i++)
{
if (rtBuffer[i] == (char)0x0A)
{
endIndex = i;
break;
}
}
//Send buffer updated events
OnRtBufferUpdated?.Invoke(this, rtBuffer);
//Handle ending if we did
if (endIndex != -1)
{
//Convert to string and update state
rtText = new string(rtBuffer, 0, endIndex);
rtComplete = true;
//Send event
OnRtTextUpdated?.Invoke(this, rtText);
}
}
/// <summary>
/// Clears out information, but will not stop events. This should be called when a new station is tuned to
/// </summary>
public void Reset()
{
//Apply changes
rdsSupported = false;
piCode = 0;
psComplete = false;
rtComplete = false;
timeComplete = false;
psBuffer = CreateEmptyBuffer(8);
rtBuffer = CreateEmptyBuffer(64);
//Fire events
OnPsBufferUpdated?.Invoke(this, psBuffer);
OnPsNameUpdated?.Invoke(this, "");
OnRtTextUpdated?.Invoke(this, "");
OnRtBufferUpdated?.Invoke(this, rtBuffer);
OnRtBufferCleared?.Invoke(this);
OnReset?.Invoke(this);
}
/// <summary>
/// Processes a 2A "RadioText" frame type 0b00100
/// </summary>
/// <param name="frame"></param>
private void ProcessFramePayload_RadioTextA(RDSFrame frame)
{
//Read the header flags
bool flagAb = 1 == ((frame.b >> (HEADER_OFFSET - 0)) & 0b0000000000000001);
//Get the index and multiply it by 4, as that is the spacing
int addressIndex = (frame.b & 0b0000000000001111) * 4;
//Check if we should reset
if (flagAb != _rtLastAbFlag && addressIndex == 0)
{
//Clear buffer
for (int i = 0; i < rtBuffer.Length; i++)
{
rtBuffer[i] = (char)0x00;
}
//Update state
_rtLastAbFlag = flagAb;
//Send event
OnRtBufferCleared?.Invoke(this);
}
//Write all
rtBuffer[addressIndex + 0] = (char)((frame.c >> 8) & 0x00FF);
rtBuffer[addressIndex + 1] = (char)((frame.c >> 0) & 0x00FF);
rtBuffer[addressIndex + 2] = (char)((frame.d >> 8) & 0x00FF);
rtBuffer[addressIndex + 3] = (char)((frame.d >> 0) & 0x00FF);
//Search this string to see if we reached the end
int endIndex = -1;
for (int i = addressIndex; i < addressIndex + 4; i++)
{
//Official spec claims that the character 0x0A should be used to indicate the end, but some stations in my area don't do that.
//We also check \r for this reason. Cumulus Media stations are using \r instead.
if (rtBuffer[i] == (char)0x0A || rtBuffer[i] == '\r')
{
endIndex = i;
break;
}
}
//Send buffer updated events
OnRtBufferUpdated?.Invoke(this, rtBuffer);
//Handle ending if we did
if (endIndex != -1)
{
//Make sure this is really the end. We should have no null characters up to this point
for (int i = 0; i < endIndex; i++)
{
if (rtBuffer[i] == (char)0x00)
{
return;
}
}
//Convert to string and update state
rtText = new string(rtBuffer, 0, endIndex);
rtComplete = true;
//Send event
OnRtTextUpdated?.Invoke(this, rtText);
}
}
