/// <summary>
/// Initialize the underlying WebRTC peer connection.
/// </summary>
/// <remarks>
/// This method must be called once before using the peer connection. If <see cref="AutoInitializeOnStart"/>
/// is <c>true</c> then it is automatically called during <a href="https://docs.unity3d.com/ScriptReference/MonoBehaviour.Start.html">MonoBehaviour.Start()</a>.
///
/// This method is asynchronous and completes its task when the initializing completed.
/// On successful completion, it also trigger the <see cref="OnInitialized"/> event.
/// Note however that this completion is free-threaded and complete immediately when the
/// underlying peer connection is initialized, whereas any <see cref="OnInitialized"/>
/// event handler is invoked when control returns to the main Unity app thread. The former
/// is faster, but does not allow accessing the underlying peer connection because it
/// returns before <see cref="OnPostInitialize"/> executed. Therefore it is generally
/// recommended to listen to the <see cref="OnInitialized"/> event, and ignore the returned
/// <see xref="System.Threading.Tasks.Task"/> object.
///
/// If the peer connection is already initialized, this method returns immediately with
/// a <see xref="System.Threading.Tasks.Task.CompletedTask"/> object. The caller can check
/// that the <see cref="Peer"/> property is non-<c>null</c> to confirm that the connection
/// is in fact initialized.
/// </remarks>
private Task InitializeAsync(CancellationToken token = default(CancellationToken))
{
CreateNativePeerConnection();
// Ensure Android binding is initialized before accessing the native implementation
Android.Initialize();
#if UNITY_WSA && !UNITY_EDITOR
if (UnityEngine.WSA.Application.RunningOnUIThread())
#endif
{
return(RequestAccessAndInitAsync(token));
}
#if UNITY_WSA && !UNITY_EDITOR
else
{
UnityEngine.WSA.Application.InvokeOnUIThread(() => RequestAccessAndInitAsync(token), waitUntilDone: true);
return(Task.CompletedTask);
}
#endif
}
protected async void OnEnable()
{
if (Source != null)
{
return;
}
#if PLATFORM_ANDROID
// Ensure Android binding is initialized before accessing the native implementation
Android.Initialize();
// Check for permission to access the camera
if (!Permission.HasUserAuthorizedPermission(Permission.Microphone))
{
if (!_androidRecordAudioRequestPending)
{
// Monitor the OnApplicationFocus(true) event during the next 5 minutes,
// and check for permission again each time (see below why).
_androidRecordAudioRequestPending = true;
_androidRecordAudioRequestRetryUntilTime = Time.time + 300;
// Display dialog requesting user permission. This will return immediately,
// and unfortunately there's no good way to tell when this completes. As a rule
// of thumb, application should lose focus, so check when focus resumes should
// be sufficient without having to poll every frame.
Permission.RequestUserPermission(Permission.Microphone);
}
return;
}
#endif
#if UNITY_WSA && !UNITY_EDITOR
// Request access to audio capture. The OS may show some popup dialog to the
// user to request permission. This will succeed only if the user approves it.
try
{
if (UnityEngine.WSA.Application.RunningOnUIThread())
{
await RequestAccessAsync();
}
else
{
UnityEngine.WSA.Application.InvokeOnUIThread(() => RequestAccessAsync(), waitUntilDone: true);
}
}
catch (Exception ex)
{
// Log an error and prevent activation
Debug.LogError($"Audio access failure: {ex.Message}.");
this.enabled = false;
return;
}
#endif
var initConfig = new LocalAudioDeviceInitConfig
{
AutoGainControl = _autoGainControl,
};
try
{
Source = await DeviceAudioTrackSource.CreateAsync(initConfig);
if (Source == null)
{
throw new Exception("DeviceAudioTrackSource.CreateAsync() returned a NULL source.");
}
}
catch (Exception ex)
{
Debug.LogError($"Failed to create device track source for {nameof(MicrophoneSource)} component '{name}'.");
Debug.LogException(ex, this);
return;
}
IsStreaming = true;
AudioSourceStarted.Invoke(this);
}
protected async void OnEnable()
{
if (Source != null)
{
return;
}
#if PLATFORM_ANDROID
// Ensure Android binding is initialized before accessing the native implementation
Android.Initialize();
// Check for permission to access the camera
if (!Permission.HasUserAuthorizedPermission(Permission.Camera))
{
if (!_androidCameraRequestPending)
{
// Monitor the OnApplicationFocus(true) event during the next 5 minutes,
// and check for permission again each time (see below why).
_androidCameraRequestPending = true;
_androidCameraRequestRetryUntilTime = Time.time + 300;
// Display dialog requesting user permission. This will return immediately,
// and unfortunately there's no good way to tell when this completes. As a rule
// of thumb, application should lose focus, so check when focus resumes should
// be sufficient without having to poll every frame.
Permission.RequestUserPermission(Permission.Camera);
}
return;
}
#elif UNITY_WSA && !UNITY_EDITOR
// Request UWP access to video capture. The OS may show some popup dialog to the
// user to request permission. This will succeed only if the user grants permission.
try
{
// Note that the UWP UI thread and the main Unity app thread are always different.
// https://docs.unity3d.com/Manual/windowsstore-appcallbacks.html
// We leave the code below as an example of generic handling in case this would be used in
// some other place, and in case a future version of Unity decided to change that assumption,
// but currently OnEnable() is always invoked from the main Unity app thread so here the first
// branch is never taken.
if (UnityEngine.WSA.Application.RunningOnUIThread())
{
await RequestAccessAsync();
}
else
{
UnityEngine.WSA.Application.InvokeOnUIThread(() => RequestAccessAsync(), waitUntilDone: true);
}
}
catch (Exception ex)
{
// Log an error and prevent activation
Debug.LogError($"Video access failure: {ex.Message}.");
this.enabled = false;
return;
}
#endif
// Handle automatic capture format constraints
string videoProfileId = VideoProfileId;
var videoProfileKind = VideoProfileKind;
int width = Constraints.width;
int height = Constraints.height;
double framerate = Constraints.framerate;
#if ENABLE_WINMD_SUPPORT
if (FormatMode == LocalVideoSourceFormatMode.Automatic)
{
// Do not constrain resolution by default, unless the device calls for it (see below).
width = 0; // auto
height = 0; // auto
// Avoid constraining the framerate; this is generally not necessary (formats are listed
// with higher framerates first) and is error-prone as some formats report 30.0 FPS while
// others report 29.97 FPS.
framerate = 0; // auto
// For HoloLens, use video profile to reduce resolution and save power/CPU/bandwidth
if (global::Windows.Graphics.Holographic.HolographicSpace.IsAvailable)
{
if (!global::Windows.Graphics.Holographic.HolographicDisplay.GetDefault().IsOpaque)
{
if (global::Windows.ApplicationModel.Package.Current.Id.Architecture == global::Windows.System.ProcessorArchitecture.X86)
{
// Holographic AR (transparent) x86 platform - Assume HoloLens 1
videoProfileKind = WebRTC.VideoProfileKind.VideoRecording; // No profile in VideoConferencing
width = 896; // Target 896 x 504
}
else
{
// Holographic AR (transparent) non-x86 platform - Assume HoloLens 2
videoProfileKind = WebRTC.VideoProfileKind.VideoConferencing;
width = 960; // Target 960 x 540
}
}
}
}
#elif PLATFORM_ANDROID
if (FormatMode == LocalVideoSourceFormatMode.Automatic)
{
// Avoid constraining the framerate; this is generally not necessary (formats are listed
// with higher framerates first) and is error-prone as some formats report 30.0 FPS while
// others report 29.97 FPS.
framerate = 0; // auto
string deviceId = WebcamDevice.id;
if (string.IsNullOrEmpty(deviceId))
{
List <VideoCaptureDevice> listedDevices = await PeerConnection.GetVideoCaptureDevicesAsync();
if (listedDevices.Count > 0)
{
deviceId = listedDevices[0].id;
}
}
if (!string.IsNullOrEmpty(deviceId))
{
// Find the closest format to 720x480, independent of framerate
List <VideoCaptureFormat> formats = await DeviceVideoTrackSource.GetCaptureFormatsAsync(deviceId);
double smallestDiff = double.MaxValue;
bool hasFormat = false;
foreach (var fmt in formats)
{
double diff = Math.Abs(fmt.width - 720) + Math.Abs(fmt.height - 480);
if ((diff < smallestDiff) || !hasFormat)
{
hasFormat = true;
smallestDiff = diff;
width = (int)fmt.width;
height = (int)fmt.height;
}
}
if (hasFormat)
{
Debug.Log($"WebcamSource automated mode selected resolution {width}x{height} for Android video capture device #{deviceId}.");
}
}
}
#endif
// TODO - Fix codec selection (was as below before change)
// Force again PreferredVideoCodec right before starting the local capture,
// so that modifications to the property done after OnPeerInitialized() are
// accounted for.
//< FIXME
//PeerConnection.Peer.PreferredVideoCodec = PreferredVideoCodec;
// Check H.264 requests on Desktop (not supported)
//#if !ENABLE_WINMD_SUPPORT
// if (PreferredVideoCodec == "H264")
// {
// Debug.LogError("H.264 encoding is not supported on Desktop platforms. Using VP8 instead.");
// PreferredVideoCodec = "VP8";
// }
//#endif
// Create the track
var deviceConfig = new LocalVideoDeviceInitConfig
{
videoDevice = WebcamDevice,
videoProfileId = videoProfileId,
videoProfileKind = videoProfileKind,
width = (width > 0 ? (uint?)width : null),
height = (height > 0 ? (uint?)height : null),
framerate = (framerate > 0 ? (double?)framerate : null),
enableMrc = EnableMixedRealityCapture,
enableMrcRecordingIndicator = EnableMRCRecordingIndicator
};
try
{
var source = await DeviceVideoTrackSource.CreateAsync(deviceConfig);
AttachSource(source);
}
catch (Exception ex)
{
Debug.LogError($"Failed to create device track source for {nameof(WebcamSource)} component '{name}'.");
Debug.LogException(ex, this);
return;
}
}
private Task <bool> RequestAccessAsync(CancellationToken token)
{
#if !UNITY_EDITOR && UNITY_ANDROID
// Ensure Android binding is initialized before accessing the native implementation
Android.Initialize();
// Check for permission to access the camera
if (!Permission.HasUserAuthorizedPermission(Permission.Microphone))
{
// Display dialog requesting user permission. This will return immediately,
// and unfortunately there's no good way to tell when this completes.
Permission.RequestUserPermission(Permission.Microphone);
// As a rule of thumb, application should lose focus, so check when focus resumes should
// be sufficient without having to poll every frame.
// Monitor the OnApplicationFocus(true) event during the next 5 minutes,
// and check for permission again each time
var tcs = new TaskCompletionSource <bool>();
lock (_androidPermissionRequestLock)
{
Debug.Assert(_androidPermissionRequestTcs == null);
_androidPermissionRequestTcs = tcs;
}
Task.Delay(TimeSpan.FromMinutes(5)).ContinueWith(_ =>
{
lock (_androidPermissionRequestLock)
{
// Check if the component is still waiting on the same permission request.
// If it has been disabled and then re-enabled, _androidPermissionRequestTcs will be different.
if (_androidPermissionRequestTcs == tcs)
{
Debug.LogError("User denied RecordAudio (microphone) permission; cannot use MicrophoneSource.");
_androidPermissionRequestTcs.SetResult(false);
_androidPermissionRequestTcs = null;
}
}
});
// If the initialization is canceled, end the task and reset the TCS.
token.Register(() =>
{
lock (_androidPermissionRequestLock)
{
// Check if the component is still waiting on the same permission request.
// If the request has completed or timed out, _androidPermissionRequestTcs will be null.
if (_androidPermissionRequestTcs != null)
{
Debug.Assert(_androidPermissionRequestTcs == tcs);
_androidPermissionRequestTcs.SetCanceled();
_androidPermissionRequestTcs = null;
}
}
});
return(tcs.Task);
}
// Already has permission.
return(Task.FromResult(true));
#elif UNITY_WSA && !UNITY_EDITOR
return(UwpUtils.RequestAccessAsync(StreamingCaptureMode.Audio));
#else
return(Task.FromResult(true));
#endif
}