public BassAudioProvider(BassItem device)
{
if (device == null)
{
throw new ArgumentNullException();
}
ManagedBass.Bass.RecordInit(device.Id);
var devInfo = ManagedBass.Bass.RecordGetDeviceInfo(device.Id);
if (devInfo.IsLoopback)
{
var playbackDevice = FindPlaybackDevice(devInfo);
if (playbackDevice != -1)
{
ManagedBass.Bass.Init(playbackDevice);
ManagedBass.Bass.CurrentDevice = playbackDevice;
_silenceHandle = ManagedBass.Bass.CreateStream(44100, 2, BassFlags.Default, Extensions.SilenceStreamProcedure);
ManagedBass.Bass.ChannelSetAttribute(_silenceHandle, ChannelAttribute.Volume, 0);
}
}
ManagedBass.Bass.CurrentRecordingDevice = device.Id;
var info = ManagedBass.Bass.RecordingInfo;
_recordingHandle = ManagedBass.Bass.RecordStart(info.Frequency, info.Channels, BassFlags.RecordPause, RecordProcedure);
}
private void InitDevice(BassItem device)
{
_devices.Add(device.Id, new RecordingItem
{
DeviceId = device.Id
});
device.PropertyChanged += (sender, e) =>
{
if (e.PropertyName != nameof(device.Active))
{
return;
}
if (device.Active)
{
AddDevice(device);
}
else
{
RemoveDevice(device);
}
};
if (device.Active)
{
AddDevice(device);
}
}
private void AddDevice(BassItem device)
{
lock (_syncLock)
{
if (_devices[device.Id].RecordingHandle != 0)
{
return;
}
ManagedBass.Bass.RecordInit(device.Id);
var devInfo = ManagedBass.Bass.RecordGetDeviceInfo(device.Id);
if (devInfo.IsLoopback)
{
var playbackDevice = FindPlaybackDevice(devInfo);
if (playbackDevice != -1)
{
ManagedBass.Bass.Init(playbackDevice);
ManagedBass.Bass.CurrentDevice = playbackDevice;
var silence = ManagedBass.Bass.CreateStream(44100, 2, BassFlags.Default, Extensions.SilenceStreamProcedure);
ManagedBass.Bass.ChannelSetAttribute(silence, ChannelAttribute.Volume, 0);
_devices[device.Id].SilenceHandle = silence;
}
}
ManagedBass.Bass.CurrentRecordingDevice = device.Id;
var info = ManagedBass.Bass.RecordingInfo;
var handle = ManagedBass.Bass.RecordStart(info.Frequency, info.Channels, BassFlags.RecordPause, null);
_devices[device.Id].RecordingHandle = handle;
BassMix.MixerAddChannel(_mixer, handle, BassFlags.MixerDownMix | BassFlags.MixerLimit);
if (_running)
{
ManagedBass.Bass.ChannelPlay(handle);
}
}
}
private void RemoveDevice(BassItem device)
{
lock (_syncLock)
{
if (_devices[device.Id].RecordingHandle == 0)
{
return;
}
var handle = _devices[device.Id].RecordingHandle;
BassMix.MixerRemoveChannel(handle);
ManagedBass.Bass.StreamFree(handle);
_devices[device.Id].RecordingHandle = 0;
ManagedBass.Bass.StreamFree(_devices[device.Id].SilenceHandle);
_devices[device.Id].SilenceHandle = 0;
}
}
