Six channel output with NAudio? (Or suggestions for other .NET library that supports it?)

Question

I've written a method in C# using NAudio that successfully outputs 2 channel sound, but fails at 6 channel sound.

When using WaveOut, I get 'MmException was unhandled: InvalidParameter calling waveOutOpen'

Here's my code:

    public class AudioOutput {
    private WaveOut latestAudioOut = null;
    private WaveMemoryStream latestMemoryStream = null;
    public void PlayAudio (byte[][] buffers, WaveFormat format) {
        if (latestAudioOut != null) {
            latestAudioOut.Stop();
            latestAudioOut.Dispose();
        }
        latestAudioOut = new WaveOut();
        if (latestMemoryStream != null) {
            latestMemoryStream.Dispose();
        }
        int longestChannelLength = 0;
        foreach (byte[] b in buffers) {
            if (b != null) if (b.Length > longestChannelLength) longestChannelLength = b.Length;
        }
        byte[][] finalisedbuffers = new byte[buffers.Length][];
        for (int i = 0; i < buffers.Length; i ++) {
            finalisedbuffers[i] = new byte[longestChannelLength];
            if (buffers[i] != null) buffers[i].CopyTo(finalisedbuffers[i], 0);
        }
        buffers = finalisedbuffers;
        byte[] interLeavedBuffer = new byte[longestChannelLength * buffers.Length];
        int bytesPerSample  = format.BitsPerSample / 8;
        int frameLength = buffers.Length * bytesPerSample;
        int numberOfFrames = longestChannelLength / bytesPerSample;
        int position = 0;
        int frameStart = 0;
        for (int f = 0; f < numberOfFrames; f ++) {
            for (int c = 0; c < buffers.Length; c ++) {
                for (int b = 0; b < bytesPerSample; b ++) {
                    interLeavedBuffer[position] = buffers[c][frameStart + b];
                    position ++;
                }
            }
            frameStart += bytesPerSample;
        }
        MemoryStream bufferStream = new MemoryStream(interLeavedBuffer);
        latestMemoryStream = new WaveMemoryStream(bufferStream, format);
        latestAudioOut.Init(latestMemoryStream);
        latestAudioOut.Play();
    }

score 1 · Accepted Answer · answered May 21 '13 at 09:56

1

I would suppose you need to use WaveFormatExtensible instead of WaveFormat.

answered May 21 '13 at 09:56

JeffRSon

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I tried simply replacing WaveFormat with WaveFormatExtensible. It seems to have solved it, thank you! – Simon Crowe May 21 '13 at 10:16

score 0 · Answer 2 · answered May 21 '13 at 09:34

I know this might appear to be a glib response that doesn't actually tackle your particular problem but I had a requirement to provide extensive audio support in my own project a few years ago.

After evaluating all the C# compatible libraries I could find (including NAudio) I opted to use BASS Library from Un4seen Developments This library is amazing and has full and extensive support for C#.

It can handle everything I've ever thrown at it and supports a rich plugin environment and VST support as well. Achieving what you need using BASS should be very straight forward and the support forums are very good.

Not glib at all, as I'm looking for alternatives. Thanks. – Simon Crowe May 21 '13 at 09:36 — Simon Crowe, May 21 '13 at 09:36
Nice! Mark as answer if it helps! :) – Jammer May 21 '13 at 09:48 — Jammer, May 21 '13 at 09:48

Six channel output with NAudio? (Or suggestions for other .NET library that supports it?)

2 Answers2