/// <summary>
/// This method is called when new RTP packet received.
/// </summary>
/// <param name="sender">Sender.</param>
/// <param name="e">Event data.</param>
private void m_pRTP_Stream_PacketReceived(object sender, RTP_PacketEventArgs e)
{
if (m_IsDisposed)
{
return;
}
try{
AudioCodec codec = null;
if (!m_pAudioCodecs.TryGetValue(e.Packet.PayloadType, out codec))
{
// Unknown codec(payload value), skip it.
return;
}
m_pActiveCodec = codec;
// Audio-out not created yet, create it.
if (m_pAudioOut == null)
{
m_pAudioOut = new AudioOut(m_pAudioOutDevice, codec.AudioFormat);
}
// Audio-out audio format not compatible to codec, recreate it.
else if (!m_pAudioOut.AudioFormat.Equals(codec.AudioFormat))
{
m_pAudioOut.Dispose();
m_pAudioOut = new AudioOut(m_pAudioOutDevice, codec.AudioFormat);
}
// Decode RTP audio frame and queue it for play out.
byte[] decodedData = codec.Decode(e.Packet.Data, 0, e.Packet.Data.Length);
m_pAudioOut.Write(decodedData, 0, decodedData.Length);
}
catch (Exception x) {
if (!this.IsDisposed)
{
// Raise error event(We can't throw expection directly, we are on threadpool thread).
OnError(x);
}
}
}
/// <summary>
/// Stops receiving RTP audio and palying it out.
/// </summary>
/// <exception cref="ObjectDisposedException">Is raised when this object is disposed and this method is accessed.</exception>
public void Stop()
{
if (this.IsDisposed)
{
throw new ObjectDisposedException(this.GetType().Name);
}
if (!m_IsRunning)
{
return;
}
m_IsRunning = false;
m_pRTP_Stream.PacketReceived -= new EventHandler <RTP_PacketEventArgs>(m_pRTP_Stream_PacketReceived);
if (m_pAudioOut != null)
{
m_pAudioOut.Dispose();
m_pAudioOut = null;
}
}
/// <summary>
/// Starts playing specified wave file for the specified number of times.
/// </summary>
/// <param name="stream">Wave stream.</param>
/// <param name="count">Number of times to play.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>stream</b> is null reference.</exception>
public void Play(Stream stream, int count)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (m_IsPlaying)
{
Stop();
}
m_IsPlaying = true;
m_Stop = false;
ThreadPool.QueueUserWorkItem(new WaitCallback(delegate(object state){
using (BinaryReader waveFile = new BinaryReader(stream)){
WavReader wavReader = new WavReader(waveFile);
if (!string.Equals(wavReader.Read_ChunkID(), "riff", StringComparison.InvariantCultureIgnoreCase))
{
throw new ArgumentNullException("Invalid wave file, RIFF header missing.");
}
RIFF_Chunk riff = wavReader.Read_RIFF();
wavReader.Read_ChunkID();
fmt_Chunk fmt = wavReader.Read_fmt();
using (AudioOut player = new AudioOut(m_pOutputDevice, fmt.SampleRate, fmt.BitsPerSample, fmt.NumberOfChannels)){
long audioStartOffset = waveFile.BaseStream.Position;
// Loop audio playing for specified times.
for (int i = 0; i < count; i++)
{
waveFile.BaseStream.Position = audioStartOffset;
// Read wave chunks.
while (true)
{
string chunkID = wavReader.Read_ChunkID();
// EOS reached.
if (chunkID == null || (waveFile.BaseStream.Length - waveFile.BaseStream.Position) < 4)
{
break;
}
// Wave data chunk.
else if (string.Equals(chunkID, "data", StringComparison.InvariantCultureIgnoreCase))
{
data_Chunk data = wavReader.Read_data();
int totalReaded = 0;
byte[] buffer = new byte[8000];
while (totalReaded < data.ChunkSize)
{
if (m_Stop)
{
m_IsPlaying = false;
return;
}
// Read audio block.
int countReaded = waveFile.Read(buffer, 0, (int)Math.Min(buffer.Length, data.ChunkSize - totalReaded));
// Queue audio for play.
player.Write(buffer, 0, countReaded);
// Don't buffer more than 2x read buffer, just wait some data played out first.
while (m_IsPlaying && player.BytesBuffered >= (buffer.Length * 2))
{
Thread.Sleep(10);
}
totalReaded += countReaded;
}
}
// unknown chunk.
else
{
wavReader.SkipChunk();
}
}
}
// Wait while audio playing is completed.
while (m_IsPlaying && player.BytesBuffered > 0)
{
Thread.Sleep(10);
}
}
}
m_IsPlaying = false;
}));
}
