// Use this as an alternative to inject an extra silent channel into the stream
public static IProducer <AudioBuffer> AddSilentChannel(this IProducer <AudioBuffer> audioStream)
{
byte[] audioWithExtraChannel = null;
return(audioStream.Select(
audio =>
{
int bytesPerChannel = audio.Length / audio.Format.Channels;
int bytesPerSample = audio.Format.BitsPerSample / 8;
if (audioWithExtraChannel?.Length != audio.Length + bytesPerChannel)
{
audioWithExtraChannel = new byte[audio.Length + bytesPerChannel];
}
for (int i = 0, j = 0; i < audio.Data.Length;)
{
for (int k = 0; k < audio.Format.Channels; k++)
{
for (int l = 0; l < bytesPerSample; l++)
{
audioWithExtraChannel[j++] = audio.Data[i++];
}
}
// inject silent sample
for (int l = 0; l < bytesPerSample; l++)
{
audioWithExtraChannel[j++] = 0;
}
}
var newFormat = WaveFormat.Create16BitPcm((int)audio.Format.SamplesPerSec, audio.Format.Channels + 1);
return new AudioBuffer(audioWithExtraChannel, newFormat);
}));
}
private void ButtonCreate16BitPcm_Click(object sender, RoutedEventArgs e)
{
Update(WaveFormat.Create16BitPcm((int)Format.SamplesPerSec, Format.Channels));
}
