// Called when new audio is passed to player for playback.
// Initializes all asset dependent members excluding stream dependent members
private void InitAudio(urakawa.media.data.audio.AudioMediaData audio)
{
this.audio = audio;
WaveFormat format = new WaveFormat();
BufferDescription desc = new BufferDescription();
urakawa.media.data.audio.PCMFormatInfo info = audio.getPCMFormat();
this.frameSize = info.getBlockAlign();
this.channels = info.getNumberOfChannels();
this.sampleRate = (int)info.getSampleRate();
format.AverageBytesPerSecond = (int)info.getSampleRate() * info.getBlockAlign();
format.BitsPerSample = Convert.ToInt16(info.getBitDepth());
format.BlockAlign = Convert.ToInt16(info.getBlockAlign());
format.Channels = Convert.ToInt16(info.getNumberOfChannels());
format.FormatTag = WaveFormatTag.Pcm;
format.SamplesPerSecond = (int)info.getSampleRate();
desc.Format = format;
this.bufferSize = format.AverageBytesPerSecond;
this.refreshLength = this.bufferSize / 2;
desc.BufferBytes = this.bufferSize;
desc.GlobalFocus = true;
this.soundBuffer = new SecondaryBuffer(desc, this.device);
this.pausePosition = 0;
this.previousPosition = 0;
}
/// <summary>
/// Play an asset from a specified time position its to end
/// </summary>
public void Play(urakawa.media.data.audio.AudioMediaData audio, double from)
{
if (this.state == PlayerState.Stopped || this.state == PlayerState.Paused)
{
if (audio != null && audio.getAudioDuration().getTimeDeltaAsMillisecondFloat() > 0)
{
urakawa.media.data.audio.PCMFormatInfo info = audio.getPCMFormat();
int position = CalculationFunctions.AdaptToFrame(
CalculationFunctions.ConvertTimeToByte(from, (int)info.getSampleRate(), info.getBlockAlign()),
info.getBlockAlign());
if (position >= 0 && position <= audio.getPCMLength())
{
this.startPosition = position;
InitPlay(audio, position, 0);
}
else
{
throw new Exception("Start Position is out of bounds of Audio Asset");
}
}
}
}
