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);
}
}
void InitPlay(long lStartPosition, long lEndPosition)
{
CalculationFunctions calc = new CalculationFunctions();
// Check if anything is playing or input length is out of bound
if (m_State.Equals(AudioPlayerState.stopped))
{
// 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;
// creates file stream from file
fs = new FileStream(m_Asset.Path, FileMode.Open,
FileAccess.Read);
// lEndPosition = 0 means that file is played to end
if (lEndPosition != 0)
{
m_lLength = (lEndPosition) - lStartPosition;
}
else
{
m_lLength = (m_Asset.SizeInBytes - 44 - lStartPosition);
}
// suet the file pointer position ahead header of file
fs.Position = lStartPosition + 44;
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;
m_RefreshLength = (m_Asset.SampleRate / 2) * m_Asset.FrameSize;
// calculate the size of VuMeter Update array length
m_UpdateVMArrayLength = m_SizeBuffer / 50;
m_UpdateVMArrayLength = Convert.ToInt32(calc.AdaptToFrame(Convert.ToInt32(m_UpdateVMArrayLength), m_FrameSize));
arUpdateVM = new byte [m_UpdateVMArrayLength];
// 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);
// check for fast play
int reduction = 0;
if (m_FastPlay == false)
{
SoundBuffer.Write(0, fs, 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, fs, 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
m_lPlayed = m_SizeBuffer + reduction;
m_PlayFile = true;
// Change the state and trigger event
StateChanged ob_StateChanged = new StateChanged(m_State);
m_State = AudioPlayerState.playing;
TriggerStateChangedEvent(ob_StateChanged);
StateChangedEvent(this, StateChanged.FromStopped);
// 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 playing check
}
// end of function
}