/// <summary>
/// Helper function to simplify encoding Window Media Audio
/// Should be supported on Vista and above (not tested)
/// </summary>
/// <param name="inputProvider">Input provider, must be PCM</param>
/// <param name="outputFile">Output file path, should end with .wma</param>
/// <param name="desiredBitRate">Desired bitrate. Use GetEncodeBitrates to find the possibilities for your input type</param>
public static void EncodeToWma(IWaveProvider inputProvider, string outputFile, int desiredBitRate = 192000)
{
var mediaType = SelectMediaType(AudioSubtypes.MFAudioFormat_WMAudioV8, inputProvider.WaveFormat, desiredBitRate);
if (mediaType == null)
{
throw new InvalidOperationException("No suitable WMA encoders available");
}
using (var encoder = new MediaFoundationEncoder(mediaType))
{
encoder.Encode(outputFile, inputProvider);
}
}
/// <summary>
/// Helper function to simplify encoding to AAC
/// By default, will only be available on Windows 7 and above
/// </summary>
/// <param name="inputProvider">Input provider, must be PCM</param>
/// <param name="outputFile">Output file path, should end with .mp4 (or .aac on Windows 8)</param>
/// <param name="desiredBitRate">Desired bitrate. Use GetEncodeBitrates to find the possibilities for your input type</param>
public static void EncodeToAac(IWaveProvider inputProvider, string outputFile, int desiredBitRate = 192000)
{
// Information on configuring an AAC media type can be found here:
// http://msdn.microsoft.com/en-gb/library/windows/desktop/dd742785%28v=vs.85%29.aspx
var mediaType = SelectMediaType(AudioSubtypes.MFAudioFormat_AAC, inputProvider.WaveFormat, desiredBitRate);
if (mediaType == null)
{
throw new InvalidOperationException("No suitable AAC encoders available");
}
using (var encoder = new MediaFoundationEncoder(mediaType))
{
// should AAC container have ADTS, or is that just for ADTS?
// http://www.hydrogenaudio.org/forums/index.php?showtopic=97442
encoder.Encode(outputFile, inputProvider);
}
}