/// <summary>
/// Implementation of the IDisposable pattern
/// </summary>
/// <param name="disposing">Are we being destroyed</param>
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
if (this.wavParser != null)
{
this.wavParser.Dispose();
this.wavParser = null;
}
}
}
public static void ConcatenateWavs(Stream[] wavs, Stream output)
{
var parsedWavs = new WavParser[wavs.Length];
// Get total raw data stream length
uint len = 0;
for (int i = 0; i < wavs.Length; i++)
{
var wavParser = new WavParser(wavs[i]);
parsedWavs[i] = wavParser;
len += wavParser.RawWaveSize;
}
// Write WAV header
WriteWavHeader(output, parsedWavs[0].AudioFormat, len);
// Write raw PCM data streams in sequence
for (int i = 0; i < wavs.Length; i++)
WriteRawData(wavs[i], output, WAV_HEADER_SIZE, parsedWavs[i].RawWaveSize);
//trim at the end to ignore any extra data chunks (like the ones in BWF [Broadcast Wave Format])
}
/// <summary>
/// Open the media.
/// Create the structures.
/// </summary>
protected override void OpenMediaAsync()
{
// Create a parser
this.wavParser = new WavParser(this.stream);
// Parse the header
this.wavParser.ParseWaveHeader();
this.wavParser.WaveFormatEx.ValidateWaveFormat();
this.startPosition = this.currentPosition = this.wavParser.DataPosition;
// Init
var streamAttributes = new Dictionary<MediaStreamAttributeKeys, string>();
var sourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>();
var availableStreams = new List<MediaStreamDescription>();
// Stream Description
streamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = this.wavParser.WaveFormatEx.ToHexString();
var msd = new MediaStreamDescription(MediaStreamType.Audio, streamAttributes);
this.audioDesc = msd;
availableStreams.Add(this.audioDesc);
sourceAttributes[MediaSourceAttributesKeys.Duration] = this.wavParser.Duration.ToString();
ReportOpenMediaCompleted(sourceAttributes, availableStreams);
}
/// <summary>
/// Close the media. Release the resources.
/// </summary>
protected override void CloseMedia()
{
// Close the stream
this.startPosition = this.currentPosition = 0;
this.wavParser = null;
this.audioDesc = null;
}
