VideoCapturerAndroid: Ignore transform matrix from SurfaceTexture and calculate it manually instead

webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java

Index: webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
diff --git a/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java b/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
index 39ed12cfa3d2708c9b0ee74c3724a0d707154ad7..bf3f5aba8e5cbbd3807cc186ae11ba5329d47e01 100644
--- a/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
+++ b/webrtc/api/java/android/org/webrtc/VideoCapturerAndroid.java
@@ -738,15 +738,10 @@ public class VideoCapturerAndroid implements
       firstFrameReported = true;
     }
 
-    int rotation = getFrameOrientation();
-    if (info.facing == android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT) {
-      // Undo the mirror that the OS "helps" us with.
-      // http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)
-      transformMatrix =
-          RendererCommon.multiplyMatrices(transformMatrix, RendererCommon.horizontalFlipMatrix());
-    }
     cameraStatistics.addFrame();
+    // Don't pay any attention to transformMatrix - use a hardcoded vertical flip as transform and
+    // calculate rotation manually using sensor and device orientation.
     frameObserver.onTextureFrameCaptured(captureFormat.width, captureFormat.height, oesTextureId,
-        transformMatrix, rotation, timestampNs);
+        RendererCommon.verticalFlipMatrix(), getFrameOrientation(), timestampNs);
   }
 }