/// <inheritdoc/>
public async Task ControlAsync(IProcessSelectionCriteria criteria, MultimediaAction action)
{
var manager = await this.GetManagerAsync();
var predicate = criteria.ToPredicate();
foreach (var session in manager.GetSessions().Where(predicate.IsMatch))
{
await(action switch
{
MultimediaAction.Play => session.TryPlayAsync(),
MultimediaAction.Pause => session.TryPauseAsync(),
MultimediaAction.Stop => session.TryStopAsync(),
MultimediaAction.SkipPrevious => session.TrySkipPreviousAsync(),
MultimediaAction.SkipNext => session.TrySkipNextAsync(),
_ => session.TryTogglePlayPauseAsync()
});
/// <summary>
/// Converts this instance to a <see cref="ISessionPredicate"/>.
/// </summary>
/// <param name="criteria">The criteria; this instance.</param>
/// <returns>The <see cref="ISessionPredicate"/>.</returns>
/// <exception cref="ArgumentNullException">Cannot select process as process name has not been specified.</exception>
public static ISessionPredicate ToPredicate(this IProcessSelectionCriteria criteria)
{
// Select the process by name.
if (criteria.ProcessSelectionType == ProcessSelectionType.ByName)
{
if (string.IsNullOrWhiteSpace(criteria.ProcessName))
{
throw new ArgumentNullException("Cannot select process as process name has not been specified");
}
return(new ProcessNamePredicate(criteria.ProcessName));
}
// Select the foreground process predicate.
var hwnd = User32.GetForegroundWindow();
User32.GetWindowThreadProcessId(hwnd, out var processId);
return(new ProcessIdentifierPredicate(processId));
}
/// <inheritdoc/>
public void SetDefaultAudioDevice(IProcessSelectionCriteria criteria, string deviceKey)
{
var dataFlow = this.GetDataFlow(deviceKey);
var predicate = criteria.ToPredicate();
foreach (var audioSession in this.GetAudioSessions().Where(predicate.IsMatch))
{
// Default to zero pointer; this will only change if an audio device has been specified.
var hstring = IntPtr.Zero;
var device = AudioDevices.Current.GetDeviceByKey(deviceKey);
if (!device.IsDynamic)
{
var persistDeviceId = this.GenerateDeviceId(device.Id, dataFlow);
Combase.WindowsCreateString(persistDeviceId, (uint)persistDeviceId.Length, out hstring);
}
// Set the audio device for the process.
var audioSessionProcessId = audioSession.GetProcessID;
this.AudioPolicyConfig.SetPersistedDefaultAudioEndpoint(audioSessionProcessId, dataFlow, Role.Console, hstring);
this.AudioPolicyConfig.SetPersistedDefaultAudioEndpoint(audioSessionProcessId, dataFlow, Role.Multimedia, hstring);
this.AudioPolicyConfig.SetPersistedDefaultAudioEndpoint(audioSessionProcessId, dataFlow, Role.Communications, hstring);
}
}
