When I'm trying to resample IeeeFloat wave format with sample rate of 48000 to wave format with sample rate of 41000, an exception occurred - "AcmNotPossible calling acmStreamOpen".
What is the right way to convert an input stream from one wave format to another. I need to feed MixingSampleProvider with two streams with equal wave formats.
Are they both IEEE float? And do they both have the same number of channels? I can't remember off the top of my head if the ACM resampler can do IEEE. There is also the DmoResampler available on Vista and Win 7 if not. I've also got a fully managed resampler in the works but its not ready yet
Mark
That's fantastic, thanks!
Works a charm.
They are both IEEE float. The number of channels is equal - 2. Maybe I have to convert them first to 16bit PCM and then resample?
yes, you might have to to use the ACM resampler.
If I use
WaveFormat waveFormat = new WaveFormat(44100, 2);
mixer = new MixingSampleProvider(waveFormat);
everything is ok with the WaveFormatConversionStream. But then I'm trying to save mixed song to the disk like this
WaveFileWriter.CreateWaveFile(mixedSong, new SampleToWaveProvider(mixer));
I recieve error: "Must be already floating point".
I'm running into the same problem.
I'm using your (just added) WaveInEvent, and when I pull the plug of the Mic while recording I get a MMException "NoDriver" in WaveInPrepareHeader called in WaveInBuffer::Reuse().
This exception is thrown in WaveInEvent's recording-thread so there is no way for me to catch it.
Letting it escalate to the application's Unhandled Exception handler is of no use since there's no way to keep running the program in that case - it has to exit.
Am I correct in assuming there is no handling for unforeseen events like unplugged devices ?
Anyway, I'm fixing it locally by modifying the WaveInEvent's recording thread to handle the exception by flipping 'recording' to false, but I'd rather not work with locally modified versions of NAudio of course ;)
Cheers,
Lennart.
My plan for the future (hopefully near future) is for the PlaybackStopped and RecordingStopped events to include a possible Exception. Then all IWavePlayer and IWaveIn implementations have an easy way of reporting exceptions back to the user.
FYI I am successfully catching this in the unhandled exception handler and the application does continue working afterwards:
private static void ApplicationThreadException(object sender, ThreadExceptionEventArgs e) {
if (e.Exception.Message == "NoDriver calling waveInPrepareHeader") {
//USB audio unplugged (typically the cause) - no other way to catch this exception in the volume level control due to limitation in NAudio
} else {
}
}
have checked in some code that will form part of the next version of NAudio. The PlaybackStopped and RecordingStopped events now contain an Exception property that you can examine to see why playback stopped
How did you manage to create MixingSampleProvider with that WaveFormat? It should have thrown an exception
NAudio is an open source audio API for .NET written in C# by Mark Heath, with contributions from many other developers. It is intended to provide a comprehensive set of useful utility classes from which you can construct your own audio application.
NAudio was created because the Framework Class Library that shipped with .NET 1.0 had no support for playing audio. The System.Media namespace introduced in .NET 2.0 provided a small amount of support, and the MediaElement in WPF and Silverlight took that a bit further. The vision behind NAudio is to provide a comprehensive set of audio related classes allowing easy development of utilities that play or record audio, or manipulate audio files in some way.
NAudio is licensed under the Microsoft Public License (Ms-PL) which means that you can use it in whatever project you like including commercial projects. Of course we would love it if you share any bug-fixes or enhancements you made to the original NAudio project files.
While .NET cannot compete with unmanaged languages for very low latency audio work, it still performs better than many people would expect. On a fairly modest PC, you can quite easily mix multiple WAV files together, including pass them through various effects and codecs, play back glitch free with a latency of around 100ms.
There are three main ways to get help. If you have a specific question concerning how to use NAudio, then I recommend that you ask on StackOverflow and tag your question with naudio. This gives you the best chance of getting a quick answer. You can also ask a question on the NAudio discussion forums here on CodePlex. I attempt to answer all questions, but since this is a spare time project, occasionally I get behind. Finally, I am occasionally able to offer paid support for situations where you need quick advice, bugfixes or new features. Use the contact feature of the Codeplex website to get in touch with Mark Heath if you wish to pursue this option.
How do I submit a patch?
I welcome contributions to NAudio and have accepted many patches, but if you want your code to be included, please familiarise yourself with the following guidelines:
The best way to learn how to use NAudio is to download the source code and look at the two demo applications - NAudioDemo and NAudioWpfDemo. These demonstrate several of the key capabilities of the NAudio framework. They also have the advantage of being kept up to date, whilst some of the tutorials you will find on the internet refer to old versions of NAudio.
Additional Tutorials from OpenSebJ's blog (n.b. these are for NAudio 1.3):
NAudio is an open source audio API for .NET written in C# by Mark Heath, with contributions from many other developers. It is intended to provide a comprehensive set of useful utility classes from which you can construct your own audio application.
NAudio was created because the Framework Class Library that shipped with .NET 1.0 had no support for playing audio. The System.Media namespace introduced in .NET 2.0 provided a small amount of support, and the MediaElement in WPF and Silverlight took that a bit further. The vision behind NAudio is to provide a comprehensive set of audio related classes allowing easy development of utilities that play or record audio, or manipulate audio files in some way.
NAudio is licensed under the Microsoft Public License (Ms-PL) which means that you can use it in whatever project you like including commercial projects. Of course we would love it if you share any bug-fixes or enhancements you made to the original NAudio project files.
While .NET cannot compete with unmanaged languages for very low latency audio work, it still performs better than many people would expect. On a fairly modest PC, you can quite easily mix multiple WAV files together, including pass them through various effects and codecs, play back glitch free with a latency of around 100ms.
There are three main ways to get help. If you have a specific question concerning how to use NAudio, then I recommend that you ask on StackOverflow and tag your question with naudio. This gives you the best chance of getting a quick answer. You can also ask a question on the NAudio discussion forums here on CodePlex. I attempt to answer all questions, but since this is a spare time project, occasionally I get behind. Finally, I am occasionally able to offer paid support for situations where you need quick advice, bugfixes or new features. Use the contact feature of the Codeplex website to get in touch with Mark Heath if you wish to pursue this option.
How do I submit a patch?
I welcome contributions to NAudio and have accepted many patches, but if you want your code to be included, please familiarise yourself with the following guidelines:
The best way to learn how to use NAudio is to download the source code and look at the two demo applications - NAudioDemo and NAudioWpfDemo. These demonstrate several of the key capabilities of the NAudio framework. They also have the advantage of being kept up to date, whilst some of the tutorials you will find on the internet refer to old versions of NAudio.
Additional Tutorials from OpenSebJ's blog (n.b. these are for NAudio 1.3):