/// <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();
}
}