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New Post: WaveIn Valid Sample Rates

March 4, 2013, 11:08 am
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Ok thanks Mark.

It's not a big deal. Low values (like 8-bits / 8K sample) make the output hiss a little and lowers quality (as expected), but that's the worst that happens. My USB headset microphone (rated at 16-Bit 44100/48000 Hz) produces very good quality output when I use the rated values. There is no perceivable difference when I use a sample rate higher than 48000 Hz with that mic. So I think I'm in good shape even without being able to query the device Sample Rate and Bit Depth.

I'm getting just a bit of delay between speaking and hearing the output. Just a tad of delay, but still noticeable. I set Latency at 51. If I drop it one to 50, it produces crackling static.
waveOut.DesiredLatency = 51;
Is there any other settings that might help reduce the output delay?
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New Post: MidiOut is not working

March 4, 2013, 9:24 pm
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I want to play MIDI sound out to speaker.
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New Post: MidiOut is not working

March 5, 2013, 1:54 am
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MIDI doesn't make any sound on its own, it needs to be connected to a synthesizer. What is connected to MIDI out device 0?
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New Post: WaveIn Valid Sample Rates

March 5, 2013, 9:00 am
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You better don't use that extremly low latency values. I guess you can't really do anything against that little delay. You really would have to play it in the exactly same millisecond as you say it.
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New Post: WaveIn Valid Sample Rates

March 5, 2013, 9:54 am
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Thanks filoe. I know .Net isn't the best at timing. The Forms Timer is only accurate to 55 milliseconds which seems like a life-time in CPU instructions. But it is what it is.
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New Post: WaveIn Valid Sample Rates

March 5, 2013, 11:15 am
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it's not .NET, its the waveIn and waveOut APIs. They are not particularly low latency. You need to work with WASAPI or ASIO to go to lower latencies.
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New Post: WaveIn Valid Sample Rates

March 5, 2013, 11:22 am
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Ok, thanks Mark, good to know. I'll keep that in mind. I want to stick with WaveIn/Out for now because I have XP users. And XP is still 40% of the OS marketshare -- too big to ignore.
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Source code checked in, #e1a677786346

March 6, 2013, 2:22 am
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improved the decode code in the ACM demo panel
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New Post: Stream WAV File

March 6, 2013, 7:36 am
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I am trying to figure out how to stream a WAV file. There are examples on stream MP3 files but nothing for a WAV file. I have managed to create a WaveStream and play it back. However, when I try to break it up the first set bytes plays but after that I get noise.

In the example below the ConcurrentQueue will simulate what I want to stream:
// Class member variables:
ConcurrentQueue<byte[]> _cq1 = new ConcurrentQueue<byte[]>();
private static WaveFormat _waveFormat = new WaveFormat(16000, 16, 2);
private static WaveOut _waveOut1 = new WaveOut();
private static BufferedWaveProvider _waveProvider1 =
             new BufferedWaveProvider(_waveFormat);

// Class constructor
public MainWindow()
{
    _waveOut1.Init(_waveProvider1);
    _waveOut1.Play();
}

// These methods are executed on a seperate thread.
WaveStream convertedStream = GetAudio("MyFile.Wav");
AddAudio(convertedStream);


// This method is executed on a seperate thread.
PlayAudio();


 

        private WaveStream GetAudio(string wavFile)
        {
            WaveFileReader reader = new WaveFileReader(wavFile);
            WaveStream convertedStream =
                new WaveFormatConversionStream(_waveFormat, reader);

            return convertedStream;
        }

        private void AddAudio(WaveStream convertedStream)
        {
            int bufferSize = (int)convertedStream.Length / _audioSamples;

            byte[] bytes = new byte[bufferSize];
            int count = bufferSize;
            convertedStream.Position = 0;
            int offset = 0;
            for (; ; )
            {
                count = convertedStream.Read(bytes, offset, bufferSize);
                _cq1.Enqueue(bytes);
                offset += bufferSize;
                if (count == 0)
                {
                    break;
                }
            }
         }

        private void PlayAudio()
        {
            byte[] buffer;
            for (; ; )
            {
                if (_cq1.TryDequeue(out buffer))
                {
                    _waveProvider1.AddSamples(buffer, 0, buffer.Length);
                }

                Thread.Sleep(_sleepMilliSeconds);
            }
        }
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New Post: Mixing audio from directshow

March 6, 2013, 7:53 am
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New Post: Stream WAV File

March 6, 2013, 2:02 pm
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New Post: Stream WAV File

March 6, 2013, 2:08 pm
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I'm not sure what you are trying to do here. Why not just play directly from a WaveFileReader? If you are receiving WAV over the network, then just stick it into the BufferedWaveProvider (and increase the buffer size or block when it gets full). The concurrent queue seems unnecessary.
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New Post: Stream WAV File

March 6, 2013, 3:15 pm
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I am trying to simulate my network traffic before I go off an code that part. I should be able to read bytes from a queue and add them to my WaveProvider continously.
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New Post: Stream WAV File

March 7, 2013, 5:55 am
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I figured it out. The problem was in the AddAudio method. If I use this method it works:
        private void AddAudio(WaveStream convertedStream)
        {
            int sampleRate = convertedStream.WaveFormat.SampleRate;

            int bytesRead = 0;
            while (convertedStream.Position < convertedStream.Length)
            {
                byte[] bytes = new byte[sampleRate];
                bytesRead = convertedStream.Read(bytes, 0, sampleRate);
                _cq1.Enqueue(bytes);
            }
        }
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New Comment on "WAV"

March 7, 2013, 12:16 pm
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This worked for me to play a wav file: using NAudio.Wave; ..... var soundFile = "Something.wav"; using (var wfr = new WaveFileReader(soundFile)) using (WaveChannel32 wc = new WaveChannel32(wfr) {PadWithZeroes = false}) using (var audioOutput = new DirectSoundOut()) { audioOutput.Init(wc); audioOutput.Play(); while (audioOutput.PlaybackState != PlaybackState.Stopped) { Thread.Sleep(20); } audioOutput.Stop(); } In this case, the PlaybackStopped event was raised, but I guess it's not good to count on that. This would work when running as a service on Windows 7.
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New Post: How to user StereoToMonoProvider

March 7, 2013, 1:12 pm
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I am trying to get SteroToMonoProvider to work. So have I have there working.
private WaveFormat _waveFormat = new WaveFormat(44100, 16, 2);

_waveProvider1 = new BufferedWaveProvider(_waveFormat);
_waveProvider1.BufferDuration = new TimeSpan(_bufferHours,
                                                                       _bufferMinutes,
                                                                       _bufferSeconds);
_waveProvider1.DiscardOnBufferOverflow = true;
_StereoToMono1 = new StereoToMonoProvider16(_waveProvider1);

_waveOut1.Init(_StereoToMono1);
_waveOut1.play();

_StereoToMono1.LeftVolume = 0;
_StereoToMono1.RightVolume = 1;
I am streaming Audio into the BufferedWaveProvider. The wav files I am streaming at 16bit PCM at 44kHz 2 Channel.

So when I set the StereoToMono1.LeftVolume to zero and the RightVolume to 1 the sound does not shift to the right side.

Thanks
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New Post: How to user StereoToMonoProvider

March 7, 2013, 1:16 pm
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that's because it's mono. Mono is the same in both speakers. You want to go mono to stereo instead.
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New Post: How to user StereoToMonoProvider

March 7, 2013, 1:36 pm
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So I switched to use a MonoToStereoProvider class and get the "Source must be Mono"?
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New Post: How to user StereoToMonoProvider

March 7, 2013, 1:38 pm
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yes, MonoToStereo takes mono in and gives stereo out. You want stereo in and stereo out,, but with the channels swapped about a bit from the sounds of it. You'd need to make a custom provider to do that.
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New Post: How to user StereoToMonoProvider

March 7, 2013, 1:50 pm
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Yeah I want to take a stereo input and then only hear the left or the right channel.

Do I need to create a provider to do that?
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