no audio on silence

[roman-miniailov]

Hi

It's a serious problem that audio not comes if no audio output device used, that's must be a silence, without this it's not a filter that can be used in real application and be sure that all ok.

[roman-miniailov]

hm, using binary version of screen capture tool all ok... can you help? maybe old filter code in repository?

[roman-miniailov]

hm, worked normally usually, with a silence, but first time of filter usage is not... any ideas?

[rdp]

It should fail if nothing is playing, could you double check? do the audio capturer binary dll's differ at all?

On Mon, Jul 14, 2014 at 2:16 PM, roman-minyaylov notifications@github.com wrote:

hm, worked normally usually, with a silence, but first time of filter usage is not... any ideas?

— Reply to this email directly or view it on GitHub https://github.com/rdp/virtual-audio-capture-grabber-device/issues/10#issuecomment-48953669 .

[roman-miniailov]

fail if nothing is played? that's a very strange idea... nothing is silence, that's ok...

yes, i tried your binary and build from source code

[rdp]

patch welcome for this one...I haven't been able to figure out an awesome work around yet :|

On Tue, Jul 15, 2014 at 11:16 AM, roman-minyaylov notifications@github.com wrote:

fail if nothing is played? that's a very strange idea... nothing is silence, that's ok...

yes, i tried your binary and build from source code

— Reply to this email directly or view it on GitHub https://github.com/rdp/virtual-audio-capture-grabber-device/issues/10#issuecomment-49063960 .

[roman-miniailov]

i've made silence generation (output to DirectSound, in external code), this workaround worked normally.

[rdp]

OK good to know. Code snippet would be good too :)

On Wed, Jul 16, 2014 at 7:23 AM, roman-minyaylov notifications@github.com wrote:

i've made silence generation (output to DirectSound, in external code), this workaround worked normally.

— Reply to this email directly or view it on GitHub https://github.com/rdp/virtual-audio-capture-grabber-device/issues/10#issuecomment-49164092 .

[roman-miniailov]

public class NASilenceOutput
{
    private DirectSoundOut waveOut;

    public void Start()
    {
            SilenceWaveProvider32 waveProvider = new SilenceWaveProvider32();
            waveProvider.SetWaveFormat(44100, 2); // 16kHz mono
            waveProvider.Frequency = 125;
            waveProvider.Amplitude = 0.25f;
            waveOut = new DirectSoundOut();
            waveOut.Init(waveProvider);
            // waveOut.DesiredLatency = 10;
            waveOut.Play();
    }

    public void Stop()
    {
        if (waveOut != null)
        {
            waveOut.Stop();
            waveOut.Dispose();
            waveOut = null;
        }
    }

}

public class SilenceWaveProvider32 : WaveProvider32
{
    public override int Read(float[] buffer, int offset, int sampleCount)
    {
        return sampleCount;
    }
}

Using .Net / NAudio. So, specific, but idea is clear - generate sound (really fill by 0) and send to DirectSound output. Can be done in C++.

[rdp]

dang, too bad I'm stuck with C++ for this .dll ...

[roman-miniailov]

Oh, that's a simple idea - just generate sound (silence) and made output to DirectSound speakers. Can be done in C++. (Not WaveOut, we have side effect - volume control goes crazy in Windows 7+, if any another sound output present in application)

[mca64]

i had this problem earlier. Playin since fixed many problems for virtual-audio-capture-grabber-device like stream stops or audio desync. Also now is save to control volumne in Winamp, earlier this could crash stream

[mca64]

i used this for few months and works great for audio capturer, but i made this in Delphi :P http://pastebin.com/QVwXvs4h

[rdp]

Hopefully fixed internally now (finally).