/// <summary>
/// Retrieve a tag with an arbitrary name.
/// Returns an empty tag if the value isn't found or if no Xiph tags are present.
/// </summary>
/// <param name="TagName">
/// A <see cref="System.String"/> containing the name of the tag to find
/// </param>
/// <returns>
/// An <see cref="OggTag"/> containing the returned tag
/// </returns>
public OggTag GetTag(string TagName)
{
if (TagName.Length <= 0)
{
return(OggUtilities.GetEmptyTag());
} // Save some processing time and just exit if we haven't been given a tag name
// Based on tasty examples @ "Accessing Hidden Gems": http://developer.novell.com/wiki/index.php/TagLib_Sharp:_Examples
XiphComment XC = (XiphComment)m_TagLibFile.GetTag(TagTypes.Xiph);
if (XC != null)
{
string[] TagValue = XC.GetField(TagName);
if (TagValue.Length == 0)
{
// Tag doesn't exist, return empty
return(OggUtilities.GetEmptyTag());
}
else
{
OggTag tmpTag;
tmpTag.Name = TagName;
tmpTag.IsArray = (TagValue.Length > 1);
tmpTag.IsEmpty = false;
tmpTag.Values = TagValue;
tmpTag.Value = TagValue[0];
return(tmpTag);
}
}
else
{
// No valid Xiph tags found
return(OggUtilities.GetEmptyTag());
}
}
/// <summary>
/// Retrieve an array of all tag values
/// Returns a zero-length array if no Xiph tags are found
/// </summary>
/// <returns>
/// An <see cref="OggTag[]"/> containing the returned values
/// </returns>
public OggTag[] GetTags()
{
XiphComment XC = (XiphComment)m_TagLibFile.GetTag(TagTypes.Xiph);
if (XC != null)
{
if (XC.FieldCount > 0)
{
OggTag[] tmpOggTag = new OggTag[XC.FieldCount];
int Index = 0;
foreach (string FieldName in XC)
{
string[] TagValue = XC.GetField(FieldName);
if (TagValue.Length == 0)
{
tmpOggTag[Index] = OggUtilities.GetEmptyTag(); // This should never happen, but I bet if I don't check it it will!
}
else
{
// Populate this tag
tmpOggTag[Index].Name = FieldName;
tmpOggTag[Index].IsArray = (TagValue.Length > 1);
tmpOggTag[Index].IsEmpty = false;
tmpOggTag[Index].Values = TagValue;
tmpOggTag[Index].Value = TagValue[0];
}
++Index; // Increment the index so we know which OggTag we're molesting
}
// Done! Return the heap of tags
return(tmpOggTag);
}
else
{
// Xiph tags contain no items
return(new OggTag[0]);
}
}
else
{
// No valid Xiph tags found
return(new OggTag[0]);
}
}
protected void StateChange(OggPlayerStatus NewState, OggPlayerStateChanger Reason)
{
if (StateChanged != null)
{
StateChanged(this, new OggPlayerStateChangedArgs(m_PlayerState, NewState, Reason));
}
#if (DEBUG)
Console.WriteLine(DateTime.Now.ToLongTimeString() + "\tOggPlayer::StateChange -- From: " + OggUtilities.GetEnumString(m_PlayerState) + " -- To: " + OggUtilities.GetEnumString(NewState));
#endif
m_PlayerState = NewState;
}
// Player thread
private void PlayerThread()
{
bool Running = true; bool ReachedEOF = false; bool UnderRun = false;
while (Running)
{
// See what we're doing
if (m_PlayerState == OggPlayerStatus.Playing)
{
// Check number of buffers
int QueuedBuffers = 0;
AL.GetSource(m_Source, ALGetSourcei.BuffersQueued, out QueuedBuffers);
// EOF stuff
if (ReachedEOF)
{
// We've come to the end of the file, just see if there are any buffers left in the queue
if (QueuedBuffers > 0)
{
// We want to remove the buffers, so carry on to the usual playing section
}
else
{
lock (OALLocker)
{
// End of file & all buffers played, exit.
Running = false;
// Stop the output device if it isn't already
if (AL.GetSourceState(m_Source) != ALSourceState.Stopped)
{
AL.SourceStop(m_Source);
}
m_CurrentFile.ResetFile();
// Reset file's internal pointer
// De-allocate all buffers
for (int i = 0; i < m_Buffers.Length; i++)
{
AL.DeleteBuffer(ref m_Buffers[i]);
}
m_Buffers = new uint[m_BufferCount];
}
// Set state stuff & return
StateChange(OggPlayerStatus.Stopped, OggPlayerStateChanger.EndOfFile);
SendMessage(OggPlayerMessageType.PlaybackEndOfFile);
return;
}
}
// If the number of buffers is greater than 0 & the source isn't playing, poke it so it does
if ((!ReachedEOF) && (QueuedBuffers > 0) && (AL.GetError() == ALError.NoError))
{
if (AL.GetSourceState(m_Source) != ALSourceState.Playing)
{
AL.SourcePlay(m_Source);
}
}
// Check for buffer underrun
int ProcessedBuffers = 0; uint BufferRef = 0;
lock (OALLocker)
{
AL.GetSource(m_Source, ALGetSourcei.BuffersProcessed, out ProcessedBuffers);
}
if (ProcessedBuffers >= m_BufferCount)
{
UnderRun = true;
SendMessage(OggPlayerMessageType.BufferUnderrun);
}
else
{
UnderRun = false;
}
// Unbuffer any processed buffers
while (ProcessedBuffers > 0)
{
OggBufferSegment obs;
lock (OALLocker)
{
// For each buffer thats been processed, reload and queue a new one
AL.SourceUnqueueBuffers(m_Source, 1, ref BufferRef);
#if (DEBUG)
if (AL.GetError() != ALError.NoError)
{
Console.WriteLine("SourceUnqueueBuffers: ALError: " + OggUtilities.GetEnumString(AL.GetError()));
}
#endif
if (ReachedEOF)
{
--ProcessedBuffers; continue;
} // If we're at the EOF loop to the next buffer here - we don't want to be trying to fill any more
obs = m_CurrentFile.GetBufferSegment(m_BufferSize); // Get chunk of tasty buffer data with the configured segment
}
// Check the buffer segment for errors
if (obs.ReturnValue > 0)
{
lock (OALLocker)
{
// No error, queue data
AL.BufferData((int)BufferRef, m_CurrentFile.Format, obs.Buffer, obs.ReturnValue, obs.RateHz);
#if (DEBUG)
if (AL.GetError() != ALError.NoError)
{
Console.WriteLine("BufferData: ALError: " + OggUtilities.GetEnumString(AL.GetError()));
}
#endif
AL.SourceQueueBuffers(m_Source, 1, ref BufferRef);
#if (DEBUG)
if (AL.GetError() != ALError.NoError)
{
Console.WriteLine("SourceQueueBuffers: ALError: " + OggUtilities.GetEnumString(AL.GetError()));
}
#endif
}
}
else
{
if (obs.ReturnValue == 0)
{
// End of file
SendMessage(OggPlayerMessageType.BufferEndOfFile);
ReachedEOF = true;
break;
}
else
{
// Something went wrong with the read
lock (OALLocker)
{
m_PlayerState = OggPlayerStatus.Error;
AL.SourceStop(m_Source);
Running = false;
}
SendMessage(OggPlayerMessageType.FileReadError);
break;
}
}
// Check for errors
m_LastError = AL.GetError();
if (m_LastError != ALError.NoError)
{
StateChange(OggPlayerStatus.Error, OggPlayerStateChanger.Error);
lock (OALLocker) { AL.SourceStop(m_Source); }
SendMessage(OggPlayerMessageType.OpenALError, m_LastError);
Running = false;
break;
}
--ProcessedBuffers;
}
// If we under-ran, restart the player
if (UnderRun)
{
lock (OALLocker) { AL.SourcePlay(m_Source); }
}
// Do stuff with the time values & tick event
if (m_CurrentFile != null)
{
m_PlayingOffset = m_CurrentFile.GetTime();
}
if (m_TickEnabled)
{
if (m_PlayingOffset >= m_LastTick + m_TickInterval)
{
m_LastTick = m_PlayingOffset;
SendTick(m_PlayingOffset, m_PlayingOffset);
}
}
}
else if (m_PlayerState == OggPlayerStatus.Seeking)
{
// Just wait for us to finish seeking
}
else if (m_PlayerState == OggPlayerStatus.Paused)
{
// Just wait for us to un-pause
}
else
{
// Some other state, abort the playback 'cos we shouldn't
// be in the PlayerThread in this case
Running = false;
}
// Allow other shizzle to execute
if (m_UpdateDelay > 0)
{
Thread.Sleep(m_UpdateDelay);
}
}
}
protected void SendMessage(OggPlayerMessageType Message, object Params)
{
if (PlayerMessage != null)
{
PlayerMessage(this, new OggPlayerMessageArgs(Message, Params));
}
#if (DEBUG)
Console.WriteLine(DateTime.Now.ToLongTimeString() + "\tOggPlayer::SendMessage -- Message: " + OggUtilities.GetEnumString(Message));
#endif
}
