/// <summary>
/// Allocate storage for all buffers. This should be called after CreateBufferIndex,
/// after SetMediaTypes and before Start. Also create the audio mixer here.
/// </summary>
/// <returns></returns>
public bool CreateBuffers()
{
if ((audioMediaType == null) || (videoMediaType == null))
{
return(false);
}
UW.CSE.MDShow.MediaTypeWaveFormatEx wf = audioMediaType.ToMediaTypeWaveFormatEx();
audioMixer = new AudioMixer(wf.WaveFormatEx.BitsPerSample, wf.WaveFormatEx.AvgBytesPerSec, wf.WaveFormatEx.Channels);
if (videoBuffer != null)
{
if (!videoBuffer.Create(videoMediaType))
{
return(false);
}
}
else
{
return(false);
}
lock (this)
{
foreach (AudioBuffer ab in audioBuffers.Values)
{
if (!ab.Create())
{
return(false);
}
}
}
return(true);
}
/// <summary>
/// Allocates the storage used by the buffer. After this method call
/// the buffer is ready to be started.
/// </summary>
/// <param name="mt"></param>
/// <returns></returns>
public bool Create()
{
Debug.Assert(myMediaType != null);
UW.CSE.MDShow.MediaTypeWaveFormatEx wf = myMediaType.ToMediaTypeWaveFormatEx();
uint bytesPerSec = wf.WaveFormatEx.AvgBytesPerSec;
currentChannels = wf.WaveFormatEx.Channels;
if ((bytesPerSec == 0) || (SIZE_IN_SECONDS == 0))
{
return(false);
}
//Use about 1/4 second dummy audio sample to correct for lost audio data, or to resync.
// This has to be evenly divisible by the BlockAlign value which we assume to be 2 or 4.
// If we assume 4, it works for 2 as well.
SilenceSize = (uint)(bytesPerSec / 16) * 4;
Buffer = new BufferChunk((int)bytesPerSec * SIZE_IN_SECONDS);
Buffer.Length = (int)bytesPerSec * SIZE_IN_SECONDS;
PresTime = new ulong[SIZE_IN_SECONDS];
QuietBuffer = new byte[SilenceSize];
AddAudio = 0;
SkipAudio = 0;
SampleSize = bytesPerSec;
SampleCount = SIZE_IN_SECONDS;
WriteOffset = 0;
ReadOffset = 0;
SamplesReady = 0;
BufferSize = (uint)bytesPerSec * SIZE_IN_SECONDS;
BufferPos = 0;
LeftoverBytes = 0;
samplesWritten = 0;
streamStopTime = 0;
bytesBuffered = 0;
started = false;
sampleReceived = false;
return(true);
}