Implement video codec HW acceleration probing on iOS

CHANGELOG.md

@@ -18,12 +18,14 @@ All user visible changes to this project will be documented in this file. This p
 
 ### Added
 
+- Support `PeerConnection.videoDecoders()` and `PeerConnection.videoEncoders()` on iOS. ([#148])
 - Support for system audio capturing on [Windows] via `getDisplayMedia()`. ([#245], [#244])
 
 ### Changed
 
 - Upgraded [libwebrtc] to [139.0.7258.127] version. ([#248], [todo])
 
+[#148]: https://github.com/instrumentisto/medea-flutter-webrtc/pull/148
 [#244]: https://github.com/instrumentisto/medea-flutter-webrtc/issues/244
 [#245]: https://github.com/instrumentisto/medea-flutter-webrtc/pull/245
 [#248]: https://github.com/instrumentisto/medea-flutter-webrtc/pull/248

ios/Classes/controller/PeerConnectionFactoryController.swift

@@ -73,48 +73,10 @@ class PeerConnectionFactoryController {
 
       result(capabilities.asFlutterResult())
     case "videoEncoders":
-      let res = [
-        VideoCodecInfo(
-          isHardwareAccelerated: false,
-          codec: VideoCodec.VP8
-        ),
-        VideoCodecInfo(
-          isHardwareAccelerated: false,
-          codec: VideoCodec.VP9
-        ),
-        VideoCodecInfo(
-          isHardwareAccelerated: false,
-          codec: VideoCodec.AV1
-        ),
-        VideoCodecInfo(
-          isHardwareAccelerated: true,
-          codec: VideoCodec.H264
-        ),
-      ].map {
-        $0.asFlutterResult()
-      }
+      let res = self.peerFactory.videoEncoders().map { $0.asFlutterResult() }
       result(res)
     case "videoDecoders":
-      let res = [
-        VideoCodecInfo(
-          isHardwareAccelerated: false,
-          codec: VideoCodec.VP8
-        ),
-        VideoCodecInfo(
-          isHardwareAccelerated: false,
-          codec: VideoCodec.VP9
-        ),
-        VideoCodecInfo(
-          isHardwareAccelerated: false,
-          codec: VideoCodec.AV1
-        ),
-        VideoCodecInfo(
-          isHardwareAccelerated: true,
-          codec: VideoCodec.H264
-        ),
-      ].map {
-        $0.asFlutterResult()
-      }
+      let res = self.peerFactory.videoDecoders().map { $0.asFlutterResult() }
       result(res)
     case "dispose":
       self.channel.setMethodCallHandler(nil)

ios/Classes/proxy/PeerConnectionFactoryProxy.swift

@@ -1,3 +1,4 @@
+import VideoToolbox
 import WebRTC
 
 /// Returns `RtpCapabilities` based on the provided `RTCRtpCapabilities`.
@@ -93,6 +94,56 @@ class PeerConnectionFactoryProxy {
     return peerProxy
   }
 
+  /// Returns list containing information about video encoders for the different
+  /// video codecs.
+  func videoEncoders() -> [VideoCodecInfo] {
+    [
+      VideoCodecInfo(
+        isHardwareAccelerated: false,
+        codec: VideoCodec.VP8
+      ),
+      VideoCodecInfo(
+        isHardwareAccelerated: false,
+        codec: VideoCodec.VP9
+      ),
+      VideoCodecInfo(
+        isHardwareAccelerated: false,
+        codec: VideoCodec.AV1
+      ),
+      VideoCodecInfo(
+        isHardwareAccelerated: VTIsHardwareDecodeSupported(
+          kCMVideoCodecType_H264
+        ),
+        codec: VideoCodec.H264
+      ),
+    ]
+  }
+
+  /// Returns list containing information about video decoders for the different
+  /// video codecs.
+  func videoDecoders() -> [VideoCodecInfo] {
+    [
+      VideoCodecInfo(
+        isHardwareAccelerated: false,
+        codec: VideoCodec.VP8
+      ),
+      VideoCodecInfo(
+        isHardwareAccelerated: false,
+        codec: VideoCodec.VP9
+      ),
+      VideoCodecInfo(
+        isHardwareAccelerated: false,
+        codec: VideoCodec.AV1
+      ),
+      VideoCodecInfo(
+        isHardwareAccelerated: VTIsHardwareDecodeSupported(
+          kCMVideoCodecType_H264
+        ),
+        codec: VideoCodec.H264
+      ),
+    ]
+  }
+
   /// Removes the specified `PeerObserver` from the `peerObservers`.
   private func remotePeerObserver(id: Int) {
     self.peerObservers.removeValue(forKey: id)