AppRTCDemo: Render each video in a separate SurfaceView

talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java

Index: talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
diff --git a/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java b/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
index 0c910f14c7b4a51456d4ed98cd8ec53b2e3fa570..293150d5f37d10481e9610192bf344d2b5c1cb07 100644
--- a/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
+++ b/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
@@ -102,6 +102,73 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
   }
 
   /**
+   * Each scaling type has a one-to-one correspondence to a numeric minimum fraction of the video
+   * that must remain visible.
+   */
+  public static float convertScalingTypeToVisibleFraction(ScalingType scalingType) {
+    switch (scalingType) {
+      case SCALE_ASPECT_FIT:
+        return 1.0f;
+      case SCALE_ASPECT_FILL:
+        return 0.0f;
+      case SCALE_ASPECT_BALANCED:
+        return BALANCED_VISIBLE_FRACTION;
+      default:
+        throw new IllegalArgumentException();
+    }
+  }
+
+  /**
+   * Calculates display size based on minimum fraction of the video that must remain visible,
+   * video aspect ratio, and maximum display size.
+   */
+  public static Point getDisplaySize(float minVisibleFraction, float videoAspectRatio,
+      int maxDisplayWidth, int maxDisplayHeight) {
+    // If there is no constraint on the amount of cropping, fill the allowed display area.
+    if (minVisibleFraction == 0 || videoAspectRatio == 0) {
+      return new Point(maxDisplayWidth, maxDisplayHeight);
+    }
+    // Each dimension is constrained on max display size and how much we are allowed to crop.
+    final int width = Math.min(maxDisplayWidth,
+        (int) (maxDisplayHeight / minVisibleFraction * videoAspectRatio));
+    final int height = Math.min(maxDisplayHeight,
+        (int) (maxDisplayWidth / minVisibleFraction / videoAspectRatio));
+    return new Point(width, height);
+  }
+
+  /**
+   * Calculates a texture transformation matrix based on rotation, mirror, and video vs display
+   * aspect ratio.
+   */
+  public static void getTextureMatrix(float[] outputTextureMatrix, float rotationDegree,
+      boolean mirror, float videoAspectRatio, float displayAspectRatio) {
+    // The matrix stack is using post-multiplication, which means that matrix operations:
+    // A; B; C; will end up as A * B * C. When you apply this to a vertex, it will result in:
+    // v' = A * B * C * v, i.e. the last matrix operation is the first thing that affects the
+    // vertex. This is the opposite of what you might expect.
+    Matrix.setIdentityM(outputTextureMatrix, 0);
+    // Move coordinates back to [0,1]x[0,1].
+    Matrix.translateM(outputTextureMatrix, 0, 0.5f, 0.5f, 0.0f);
+    // Rotate frame clockwise in the XY-plane (around the Z-axis).
+    Matrix.rotateM(outputTextureMatrix, 0, -rotationDegree, 0, 0, 1);
+    // Scale one dimension until video and display size have same aspect ratio.
+    if (displayAspectRatio > videoAspectRatio) {
+      Matrix.scaleM(outputTextureMatrix, 0, 1, videoAspectRatio / displayAspectRatio, 1);
+    } else {
+      Matrix.scaleM(outputTextureMatrix, 0, displayAspectRatio / videoAspectRatio, 1, 1);
+    }
+    // TODO(magjed): We currently ignore the texture transform matrix from the SurfaceTexture.
+    // It contains a vertical flip that is hardcoded here instead.
+    Matrix.scaleM(outputTextureMatrix, 0, 1, -1, 1);
+    // Apply optional horizontal flip.
+    if (mirror) {
+      Matrix.scaleM(outputTextureMatrix, 0, -1, 1, 1);
+    }
+    // Center coordinates around origin.
+    Matrix.translateM(outputTextureMatrix, 0, -0.5f, -0.5f, 0.0f);
+  }
+
+  /**
    * Class used to display stream of YUV420 frames at particular location
    * on a screen. New video frames are sent to display using renderFrame()
    * call.
@@ -199,33 +266,6 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
       GlUtil.checkNoGLES2Error("y/u/v glGenTextures");
     }
 
-    private static float convertScalingTypeToVisibleFraction(ScalingType scalingType) {
-      switch (scalingType) {
-        case SCALE_ASPECT_FIT:
-          return 1.0f;
-        case SCALE_ASPECT_FILL:
-          return 0.0f;
-        case SCALE_ASPECT_BALANCED:
-          return BALANCED_VISIBLE_FRACTION;
-        default:
-          throw new IllegalArgumentException();
-      }
-    }
-
-    private static Point getDisplaySize(float minVisibleFraction, float videoAspectRatio,
-        int maxDisplayWidth, int maxDisplayHeight) {
-      // If there is no constraint on the amount of cropping, fill the allowed display area.
-      if (minVisibleFraction == 0) {
-        return new Point(maxDisplayWidth, maxDisplayHeight);
-      }
-      // Each dimension is constrained on max display size and how much we are allowed to crop.
-      final int width = Math.min(maxDisplayWidth,
-          (int) (maxDisplayHeight / minVisibleFraction * videoAspectRatio));
-      final int height = Math.min(maxDisplayHeight,
-          (int) (maxDisplayWidth / minVisibleFraction / videoAspectRatio));
-      return new Point(width, height);
-    }
-
     private void checkAdjustTextureCoords() {
       synchronized(updateTextureLock) {
         if (!updateTextureProperties) {
@@ -252,31 +292,8 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
                             (displayLayout.height() - displaySize.y) / 2);
         Log.d(TAG, "  Adjusted display size: " + displayLayout.width() + " x "
             + displayLayout.height());
-        // The matrix stack is using post-multiplication, which means that matrix operations:
-        // A; B; C; will end up as A * B * C. When you apply this to a vertex, it will result in:
-        // v' = A * B * C * v, i.e. the last matrix operation is the first thing that affects the
-        // vertex. This is the opposite of what you might expect.
-        Matrix.setIdentityM(texMatrix, 0);
-        // Move coordinates back to [0,1]x[0,1].
-        Matrix.translateM(texMatrix, 0, 0.5f, 0.5f, 0.0f);
-        // Rotate frame clockwise in the XY-plane (around the Z-axis).
-        Matrix.rotateM(texMatrix, 0, -rotationDegree, 0, 0, 1);
-        // Scale one dimension until video and display size have same aspect ratio.
-        final float displayAspectRatio = (float) displayLayout.width() / displayLayout.height();
-        if (displayAspectRatio > videoAspectRatio) {
-            Matrix.scaleM(texMatrix, 0, 1, videoAspectRatio / displayAspectRatio, 1);
-        } else {
-            Matrix.scaleM(texMatrix, 0, displayAspectRatio / videoAspectRatio, 1, 1);
-        }
-        // TODO(magjed): We currently ignore the texture transform matrix from the SurfaceTexture.
-        // It contains a vertical flip that is hardcoded here instead.
-        Matrix.scaleM(texMatrix, 0, 1, -1, 1);
-        // Apply optional horizontal flip.
-        if (mirror) {
-          Matrix.scaleM(texMatrix, 0, -1, 1, 1);
-        }
-        // Center coordinates around origin.
-        Matrix.translateM(texMatrix, 0, -0.5f, -0.5f, 0.0f);
+        getTextureMatrix(texMatrix, rotationDegree, mirror, videoAspectRatio,
+            (float) displayLayout.width() / displayLayout.height());
         updateTextureProperties = false;
         Log.d(TAG, "  AdjustTextureCoords done");
       }
@@ -415,9 +432,9 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
         frameToRenderQueue.poll();
         // Re-allocate / allocate the frame.
         yuvFrameToRender = new I420Frame(videoWidth, videoHeight, rotationDegree,
-                                         strides, null);
+                                         strides, null, 0);
         textureFrameToRender = new I420Frame(videoWidth, videoHeight, rotationDegree,
-                                             null, -1);
+                                             null, -1, 0);
         updateTextureProperties = true;
         Log.d(TAG, "  YuvImageRenderer.setSize done.");
       }