/// <summary>
/// Open the media.
/// Create the structures.
/// </summary>
protected override void OpenMediaAsync() {
header = WaveFormatExtensible.ReadHeader(stream);
header.ValidateWaveFormat();
sampleSize = (long)header.Channels * header.BitsPerSample / 8 * numSamples;
startPosition = currentPosition = stream.Position;
pcmDataLen = stream.Length - startPosition;
duration = header.AudioDurationFromDataLen(pcmDataLen);
// Init
Dictionary<MediaStreamAttributeKeys, string> streamAttributes = new Dictionary<MediaStreamAttributeKeys, string>();
Dictionary<MediaSourceAttributesKeys, string> sourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>();
List<MediaStreamDescription> availableStreams = new List<MediaStreamDescription>();
// Stream Description
streamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = header.ToHexString();
MediaStreamDescription msd = new MediaStreamDescription(MediaStreamType.Audio, streamAttributes);
this.audioDesc = msd;
availableStreams.Add(this.audioDesc);
sourceAttributes[MediaSourceAttributesKeys.Duration] = duration.ToString();
ReportOpenMediaCompleted(sourceAttributes, availableStreams);
}