CODEWITHSUNDEEP
c#naudio
VGD
VGD

Reputation: 466

AcmNotPossible calling acmStreamOpen with WaveFormatConversionStream

What I'm trying to do is convert a WaveIn microphone input to a different WaveFormat, and add that to a MixingSampleProvider.

        WaveIn waveIn = new WaveIn(this.Handle);
        waveIn.BufferMilliseconds = 25;
        waveIn.DataAvailable += waveIn_DataAvailable;

        // create wave provider
        WaveProvider waveProvider = new BufferedWaveProvider(waveIn.WaveFormat);
        WaveFormat commonWaveFormat = WaveFormat.CreateIeeeFloatWaveFormat(44100, 2);
        MixingSampleProvider msp = new MixingSampleProvider(commonWaveFormat);
        WaveFormatConversionStream wfcs = new WaveFormatConversionStream(commonWaveFormat,new WaveProviderToWaveStream(waveProvider));
        msp.AddMixerInput(wfcs);
        // create wave output to speakers
        waveOut = new WaveOut();
        waveOut.DesiredLatency = 100;
        waveOut.Init(msp);

where WaveProviderToWaveStream is a class from this answer. However, that gives me the following exception at WaveFormatConversionStream.

NAudio.MmException:AcmNotPossible calling acmStreamOpen

I tried

msp.addMixerInput(MediaFoundationResampler(waveProvider, commonWaveFormat).toSampleProvider());

which worked but produced a too large delay between talking into the microphone and hearing the output.

Upvotes: 1

Views: 1762

Answers (1)

Mark Heath
Mark Heath

Reputation: 49482

It will be much easier for you simply to specify the format you want to record in on the to WaveIn object itself. (Just set the WaveFormat property before starting to record. It should still be 16 bit PCM, but specify the sample rate and channel count you want)

Then you can turn your BufferedWaveProvider into an ISampleProvider by using the ToSampleProvider extension method which will let you add it to the MixingSampleProvider

Upvotes: 2

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