void TriggerStateChangedEvent(events.AudioPlayerEvents.StateChanged e)
{
if (m_EventsEnabled)
{
StateChanged(this, e);
}
}
public void Resume()
{
if (m_State.Equals(AudioPlayerState.Paused))
{
events.AudioPlayerEvents.StateChanged e = new events.AudioPlayerEvents.StateChanged(m_State);
m_State = AudioPlayerState.Playing;
TriggerStateChangedEvent(e);
SoundBuffer.Play(0, BufferPlayFlags.Looping);
}
}
public void Pause()
{
if (m_State.Equals(AudioPlayerState.Playing))
{
SoundBuffer.Stop();
// Change the state and trigger event
events.AudioPlayerEvents.StateChanged e = new events.AudioPlayerEvents.StateChanged(m_State);
m_State = AudioPlayerState.Paused;
TriggerStateChangedEvent(e);
}
}
public void Stop()
{
if (!m_State.Equals(AudioPlayerState.Stopped))
{
SoundBuffer.Stop();
RefreshThread.Abort();
if (ob_VuMeter != null)
{
ob_VuMeter.Reset();
}
if (m_PlayFile)
{
m_br.Close();
}
}
events.AudioPlayerEvents.StateChanged e = new events.AudioPlayerEvents.StateChanged(m_State);
m_State = AudioPlayerState.Stopped;
TriggerStateChangedEvent(e);
}
public void CatchStateChangedEvent(object sender, VirtualAudioBackend.events.AudioPlayerEvents.StateChanged state)
{
MessageBox.Show(state.OldState.ToString());
}
void RefreshBuffer()
{
int ReadPosition;
// variable to count byte difference in compressed and non compressed data of audio file
int reduction = 0;
while (m_lPlayed < m_lLength)
{ //1
if (SoundBuffer.Status.BufferLost)
{
SoundBuffer.Restore();
}
reduction = 0;
Thread.Sleep(50);
ReadPosition = SoundBuffer.PlayPosition;
if (ReadPosition < ((m_SizeBuffer) - m_UpdateVMArrayLength))
{
Array.Copy(SoundBuffer.Read(ReadPosition, typeof(byte), LockFlag.None, m_UpdateVMArrayLength), arUpdateVM, m_UpdateVMArrayLength);
//if ( m_EventsEnabled == true)
//ob_UpdateVuMeter.NotifyUpdateVuMeter ( this, ob_UpdateVuMeter ) ;
UpdateVuMeter(this, new events.AudioPlayerEvents.UpdateVuMeter()); // JQ
}
// check if play cursor is in second half , then refresh first half else second
if ((m_BufferCheck % 2) == 1 && SoundBuffer.PlayPosition > m_RefreshLength)
{ //2
// Checks if file is played or byteBuffer is played
if (m_PlayFile == true)
{ //3
LoadStream(false);
// check for normal or fast play
if (m_FastPlay == false)
{ //4
SoundBuffer.Write(0, m_MemoryStream, m_RefreshLength, 0);
} //-4
else
{ //4
for (int i = 0; i < m_RefreshLength; i = i + (m_Step * m_FrameSize))
{
SoundBuffer.Write(i, m_MemoryStream, m_Step * m_FrameSize, 0);
i = i - (2 * m_FrameSize);
reduction = reduction + (2 * m_FrameSize);
} //-4
} //-3
} //-2
m_lPlayed = m_lPlayed + m_RefreshLength + reduction + m_CompAddition;
m_BufferCheck++;
} //-1
else if ((m_BufferCheck % 2 == 0) && SoundBuffer.PlayPosition < m_RefreshLength)
{ //1
if (m_PlayFile == true)
{ //2
LoadStream(false);
if (m_FastPlay == false)
{ //3
SoundBuffer.Write(m_RefreshLength, m_MemoryStream, m_RefreshLength, 0);
} //-3
else
{ //3
for (int i = 0; i < m_RefreshLength; i = i + (m_Step * m_FrameSize))
{ //4
SoundBuffer.Write(i + m_RefreshLength, m_MemoryStream, m_Step * m_FrameSize, 0);
i = i - (2 * m_FrameSize);
reduction = reduction + (2 * m_FrameSize);
} //-4
// end of FastPlay check
} //-3
} //-2
m_lPlayed = m_lPlayed + m_RefreshLength + reduction + m_CompAddition;
m_BufferCheck++;
// end of even/ odd part of buffer;
} //-1
// end of while
}
// calculate time to stop according to remaining data
int time;
long lRemaining = (m_lPlayed - m_lLength);
double dTemp;
dTemp = ((m_RefreshLength + m_RefreshLength - lRemaining) * 1000) / m_RefreshLength;
time = Convert.ToInt32(dTemp * 0.48);
//if (m_FastPlay == true)
//time = (time-250) * (1- (2/m_Step));
Thread.Sleep(time);
// Stopping process begins
SoundBuffer.Stop();
if (ob_VuMeter != null)
{
ob_VuMeter.Reset();
}
if (m_PlayFile == true)
{
m_br.Close();
//ob_EndOfAudioAsset.NotifyEndOfAudioAsset ( this , ob_EndOfAudioAsset) ;
}
//Stop () ;
// changes the state and trigger events
//ob_StateChanged = new StateChanged (m_State) ;
EndOfAudioAsset(this, new events.AudioPlayerEvents.EndOfAudioAsset()); // JQ
events.AudioPlayerEvents.StateChanged e = new events.AudioPlayerEvents.StateChanged(m_State);
m_State = AudioPlayerState.Stopped;
TriggerStateChangedEvent(e);
// RefreshBuffer ends
}
void InitPlay(long lStartPosition, long lEndPosition)
{
// Adjust the start and end position according to frame size
lStartPosition = Calc.AdaptToFrame(lStartPosition, m_Asset.FrameSize);
lEndPosition = Calc.AdaptToFrame(lEndPosition, m_Asset.FrameSize);
m_SamplingRate = m_Asset.SampleRate;
// lEndPosition = 0 means that file is played to end
if (lEndPosition != 0)
{
m_lLength = (lEndPosition) - lStartPosition;
}
else
{
// folowing one line is modified on 2 Aug 2006
//m_lLength = (m_Asset .SizeInBytes - lStartPosition ) ;
m_lLength = (m_Asset.SizeInBytes);
}
WaveFormat newFormat = new WaveFormat();
BufferDesc = new BufferDescription();
// retrieve format from file
m_FrameSize = m_Asset.FrameSize;
m_Channels = m_Asset.Channels;
newFormat.AverageBytesPerSecond = m_Asset.SampleRate * m_Asset.FrameSize;
newFormat.BitsPerSample = Convert.ToInt16(m_Asset.BitDepth);
newFormat.BlockAlign = Convert.ToInt16(m_Asset.FrameSize);
newFormat.Channels = Convert.ToInt16(m_Asset.Channels);
newFormat.FormatTag = WaveFormatTag.Pcm;
newFormat.SamplesPerSecond = m_Asset.SampleRate;
// loads format to buffer description
BufferDesc.Format = newFormat;
// calculate size of buffer so as to contain 1 second of audio
m_SizeBuffer = m_Asset.SampleRate * m_Asset.FrameSize;
if (m_SizeBuffer > m_lLength)
{
m_SizeBuffer = Convert.ToInt32(m_lLength);
}
m_RefreshLength = (m_Asset.SampleRate / 2) * m_Asset.FrameSize;
// calculate the size of VuMeter Update array length
m_UpdateVMArrayLength = m_SizeBuffer / 20;
m_UpdateVMArrayLength = Convert.ToInt32(Calc.AdaptToFrame(Convert.ToInt32(m_UpdateVMArrayLength), m_FrameSize));
arUpdateVM = new byte [m_UpdateVMArrayLength];
// reset the VuMeter (if set)
if (ob_VuMeter != null)
{
ob_VuMeter.Reset();
}
// sets the calculated size of buffer
BufferDesc.BufferBytes = m_SizeBuffer;
// Global focus is set to true so that the sound can be played in background also
BufferDesc.GlobalFocus = true;
// initialising secondary buffer
SoundBuffer = new SecondaryBuffer(BufferDesc, SndDevice);
// Compensate played length due to the skip of frames during compression
if (m_Step != 1)
{
m_CompAddition = (m_RefreshLength * 2) / m_Step;
m_CompAddition = Convert.ToInt32(Calc.AdaptToFrame(m_CompAddition, m_FrameSize));
}
// Load from file to memory
LoadStream(true);
// check for fast play
int reduction = 0;
if (m_FastPlay == false)
{
SoundBuffer.Write(0, m_MemoryStream, m_SizeBuffer, 0);
}
else
{
// for fast play buffer is filled in parts with new part overlapping previous part
for (int i = 0; i < m_SizeBuffer; i = i + (m_Step * m_FrameSize))
{
SoundBuffer.Write(i, m_MemoryStream, m_Step * m_FrameSize, 0);
i = i - (2 * m_FrameSize);
// compute the difference in bytes skipped
reduction = reduction + (2 * m_FrameSize);
}
}
// Adds the length (count) of file played into a variable
// Folowing one line was modified on 2 Aug 2006 i.e lStartPosition is added
m_lPlayed = m_SizeBuffer + reduction + (2 * m_CompAddition) + lStartPosition;
m_PlayFile = true;
// trigger events (modified JQ)
events.AudioPlayerEvents.StateChanged e = new events.AudioPlayerEvents.StateChanged(m_State);
m_State = AudioPlayerState.Playing;
StateChanged(this, e);
// starts playing
SoundBuffer.Play(0, BufferPlayFlags.Looping);
m_BufferCheck = 1;
//initialise and start thread for refreshing buffer
RefreshThread = new Thread(new ThreadStart(RefreshBuffer));
RefreshThread.Start();
// end of function
}
