I have been playing with multimedia programs such as ffmpeg which has wonderful video processing capabilities in converting/re-encoding one file format to another but I was less impressed by its sound processing as it was always outclassed by Audacity. Audacity is king but I wonder how best to replicate its functionality from the command line or from code. In this post, I show the C# way to use the WASAPI interface via CSCore to record the sound loopback.
Give yourself a console program, and then NuGet CSCore by Florian (thanks) and then copy in the following code
using CSCore.Codecs.WAV;
using CSCore.SoundIn;
using System;
namespace CSCoreWasapiLoopbackExperiment
{
class Program
{
static void Main(string[] args)
{
using (WasapiCapture capture = new WasapiLoopbackCapture())
{
//if nessesary, you can choose a device here
//to do so, simply set the device property of the capture to any MMDevice
//to choose a device, take a look at the sample here: http://cscore.codeplex.com/
Console.WriteLine("Waiting, press any key to start");
Console.ReadKey();
//initialize the selected device for recording
capture.Initialize();
//create a wavewriter to write the data to
using (WaveWriter w = new WaveWriter("dump.wav", capture.WaveFormat))
{
//setup an eventhandler to receive the recorded data
capture.DataAvailable += (s, e) =>
{
//save the recorded audio
w.Write(e.Data, e.Offset, e.ByteCount);
};
//start recording
capture.Start();
Console.WriteLine("Started, press any key to stop");
Console.ReadKey();
//stop recording
capture.Stop();
}
}
}
}
}
So now you can record your computer's speaker output.
- GitHub - filoe_cscore_ An advanced audio library, written in C#. Provides tons of features. From playing_recording audio to decoding_encoding audio streams_files to processing audio data in realtime (e.g. applying custom effects during playback, create visualizations,...).
- CSCore - Audio Library - CodePlex Archive
- C# recording audio from soundcard - Stack Overflow
- Record Internal Audios using Audacity in Windows 10
