/// <summary> /// recording audio. /// <para> /// first set inputDeviceName = null, you will get inputDeviceName list in vs output, /// </para> /// <para> /// then set inputDeviceName to your real device name and run again,you will get a audio output. /// </para> /// <para> /// if you want stop record, exit console; /// </para> /// <para>ffmpeg </para> /// </summary> /// <param name="outputFile"></param> public RecordingAudio(string outputFile, string inputDeviceName = null) { // console output FFmpegHelper.SetupLogging(logWrite: _ => Console.Write(_)); // register all device FFmpegHelper.RegisterDevice(); var dshowInput = new InFormat("dshow"); // list all "dshow" device at console output, ffmpeg does not support direct reading of device names MediaDevice.PrintDeviceInfos(dshowInput, "list", MediaDevice.ListDevicesOptions); if (string.IsNullOrWhiteSpace(inputDeviceName)) { return; } // get your audio input device name from console output // NOTE: DO NOT delete "audio=" using (MediaReader reader = new MediaReader($"audio={inputDeviceName}", dshowInput)) using (MediaWriter writer = new MediaWriter(outputFile)) { var stream = reader.Where(_ => _.Codec.Type == AVMediaType.AVMEDIA_TYPE_AUDIO).First(); writer.AddStream(MediaEncode.CreateAudioEncode(writer.Format, stream.Codec.AVCodecContext.channels, stream.Codec.AVCodecContext.sample_rate)); writer.Initialize(); AudioFrame dstFrame = AudioFrame.CreateFrameByCodec(writer[0].Codec); SampleConverter converter = new SampleConverter(dstFrame); long pts = 0; foreach (var packet in reader.ReadPacket()) { foreach (var frame in stream.ReadFrame(packet)) { foreach (var dstframe in converter.Convert(frame)) { pts += dstFrame.AVFrame.nb_samples; dstFrame.Pts = pts; foreach (var dstpacket in writer[0].WriteFrame(dstFrame)) { writer.WritePacket(dstpacket); } } } } writer.FlushMuxer(); } }