Hi,

   I have created player using NAudio and now I have to add VOLUME METER. I use the following code.

WaveOut Player = new WaveOut();

string fileName;

AudioFileReader FileReader;

FileReader = new AudioFileReader(fileName);

Player.Init(FileReader);

Player.Play();

How I add volume meter to my player... from where I get value for Volume meter..

Thanks & Regards,

Hinshin

hi, have a look at the Audio File Playback code in the NAudioDemo project. This shows how to create a volume meter and update it.

hi,

   It tell to create a pannel...

i need to use it in a form...

fileName)

Thanks & Regards,

HInshin

the exact same code will work in a form.

Hi,

   can you please tell me the sample code for that ... I tried a lot but I was not able to find that . please tell the solution.

Thanks & Regards,

Hinshin 

Hi,

   can you please tell me the sample code for that ... I tried a lot but I was not able to find that . please tell the solution.

Thanks & Regards,

Hinshin 

This is the important bit in the demo - we wrap our input stream in a MeteringSampleProvider, and subscribe to stream volume

            var postVolumeMeter = new MeteringSampleProvider(waveChannel);
            postVolumeMeter.StreamVolume += OnPostVolumeMeter;

Then in the event handler, set the value of your volume meter:

        void OnPostVolumeMeter(object sender, StreamVolumeEventArgs e)
        {
            // we know it is stereo
            volumeMeter1.Amplitude = e.MaxSampleValues[0];
            volumeMeter2.Amplitude = e.MaxSampleValues[1];
        }

Hi,

I was always getting null value for InputFileFormats and getting error like this...

Value cannot be null.Parameter name: source

[ImportMany(typeof(IInputFileFormatPlugin))]       

public IEnumerable<IInputFileFormatPlugin> InputFileFormats { get; set; }

private IInputFileFormatPlugin GetPluginForFile(string fileName)       

{

            return (from f in this.InputFileFormats where fileName.EndsWith(f.Extension, StringComparison.OrdinalIgnoreCase) select f).FirstOrDefault();       

}

I was using AudioFileReader... 

is there any different using wavestream and AudioFileReader.

Thanks & Regards,

Hinshin

Hi,

   I done every think like Audioplayback sample in NAudio..... But There is no cjhange in VOlume Meter...

my code are,

Play Button Click

private void button2_Click(object sender, EventArgs e)

if (player != null) 

 {

if (player.PlaybackState == PlaybackState.Paused)

}

{

player.DeviceNumber = 3;

reader =new AudioFileReader(fileName);

player.Init(reader);

player.Play();

}

} 

{

sampleProvider = CreateInputStream(fileName);

}

{

 MessageBox.Show(String.Format("{0}", createException.Message), "Error Loading File");

}

{

player.Init(new SampleToWaveProvider(sampleProvider));

}

{

 return;

}

}

private ISampleProvider CreateInputStream(string fileName)

 if (plugin == null)

}

 var waveChannel = new SampleChannel(this.fileWaveStream, true);

 this.setVolumeDelegate = (vol) => waveChannel.Volume = vol;

 var postVolumeMeter = new MeteringSampleProvider(waveChannel);

postVolumeMeter.StreamVolume += OnPostVolumeMeter;

}

{

{

player.Volume = (float)1.0;

Are you hearing the audio? Also, try putting a breakpoint in OnPostVolumeMeter and seeing if it gets hit.

hi,

  yes i am hearing audio, it is not hitting OnPostVOlumeMeter event..

private IInputFileFormatPlugin GetPluginForFile(string fileName)       

{           

return (from f in this.InputFileFormats where fileName.EndsWith(f.Extension, StringComparison.OrdinalIgnoreCase) select f).FirstOrDefault();       

}

It returns null value for me... 

don't use GetPluginForFile at all. Just make an AudioFileReader. That is all you need to do.

this.fileWaveStream = new AudioFileReader(fileName);

Hi,

My exact code is,

play button click

reader = new AudioFileReader(fileName); 

player.Init(reader);

player.Play(); 

ISampleProvider sampleProvider = null;           

sampleProvider = CreateInputStream(fileName); 

return; 

private ISampleProvider CreateInputStream(string fileName)       

{           

this.fileWaveStream = new AudioFileReader(fileName);           

var waveChannel = new SampleChannel(this.fileWaveStream, true); 

var postVolumeMeter = new MeteringSampleProvider(waveChannel); 

postVolumeMeter.StreamVolume += OnPostVolumeMeter;
return postVolumeMeter;       

}
void OnPostVolumeMeter(object sender, StreamVolumeEventArgs e)       

{           

volumeMeter1.Amplitude = e.MaxSampleValues[0];           

volumeMeter2.Amplitude = e.MaxSampleValues[1];       

}

But it was not hitting OnPostVolumeMeter event... Please correct my mistake...

Thanks & Regards,

Hinshin

the thing you pass to Init must have the metering sample provider in the audio pipeline or it will have no effect. Try this:

reader = new AudioFileReader(fileName); 

var postVolumeMeter = new MeteringSampleProvider(reader); 

postVolumeMeter.StreamVolume += OnPostVolumeMeter;

player.Init(postVolumeMeter);

player.Play();

Hi,

     I was getting error because of invalid parameter....

The best overloaded method match for 'NAudio.Wave.WaveOut.Init(NAudio.Wave.IWaveProvider)' has some invalid arguments 
Argument '1': cannot convert from 'NAudio.Wave.SampleProviders.MeteringSampleProvider' to 'NAudio.Wave.IWaveProvider'

Thanks & Regards,

Hinshin

ah yes, convert to IWaveProvider (I'm planning to make that step automatic for future NAudio versions). You've already got the code that does this elsewhere in your app:

player.Init(new SampleToWaveProvider(postVolumeMeter));

hi,

   Now it not playing and hitting OnPostVolumeMeter(object sender, StreamVolumeEventArgs e) event

Thanks & Regards,

Hinshin

Hi,

   Thankyou for your response I got that (volume meter).

 I was not able to play wave file which has 319 kbps of Bit Rate...

Thanks & Regards,

Hinshin

Hi,

I was not able to play wave file which has 319 kbps of Bit Rate...

Thanks & Regards,

Hinshin

I'll need more information than that if you want help. What is the WaveFormat of the WAV file and what error message did you see?

Mark

hi,

   I was playing wave file with ( Bit Rate: 319 kbps, Audio Sample Rate: 44 kHz) and I was getting the following error...

NoDriver calling acmFormatSuggest

Thanks & Regards,

Hinshin

This means you have no ACM codec installed on your computer that can perform the requested conversion. You need to tell me what WaveFormat you are using (the most important thing is the Encoding).

For a detailed explanation, please read my article on CodeProject:

http://www.codeproject.com/Articles/501521/How-to-convert-between-most-audio-formats-in-NET

Mark