Android MediaCodecVideoDecoder: Manage lifetime of texture frames

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 bacd0cf11fd03445a4768577707cfcec27878e1c..757c4d91fd30eaf04f19773546c674c43a824ff2 100644
--- a/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
+++ b/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
@@ -38,7 +38,6 @@ import javax.microedition.khronos.opengles.GL10;
 import android.annotation.SuppressLint;
 import android.graphics.Point;
 import android.graphics.Rect;
-import android.graphics.SurfaceTexture;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
 
@@ -241,29 +240,15 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
         }
 
         if (isNewFrame) {
+          rotatedSamplingMatrix = RendererCommon.rotateTextureMatrix(
+              pendingFrame.samplingMatrix, pendingFrame.rotationDegree);
           if (pendingFrame.yuvFrame) {
             rendererType = RendererType.RENDERER_YUV;
             drawer.uploadYuvData(yuvTextures, pendingFrame.width, pendingFrame.height,
                 pendingFrame.yuvStrides, pendingFrame.yuvPlanes);
-            // The convention in WebRTC is that the first element in a ByteBuffer corresponds to the
-            // top-left corner of the image, but in glTexImage2D() the first element corresponds to
-            // the bottom-left corner. We correct this discrepancy by setting a vertical flip as
-            // sampling matrix.
-            final float[] samplingMatrix = RendererCommon.verticalFlipMatrix();
-            rotatedSamplingMatrix =
-                RendererCommon.rotateTextureMatrix(samplingMatrix, pendingFrame.rotationDegree);
           } else {
             rendererType = RendererType.RENDERER_TEXTURE;
-            // External texture rendering. Update texture image to latest and make a deep copy of
-            // the external texture.
-            // TODO(magjed): Move updateTexImage() to the video source instead.
-            final SurfaceTexture surfaceTexture = (SurfaceTexture) pendingFrame.textureObject;
-            surfaceTexture.updateTexImage();
-            final float[] samplingMatrix = new float[16];
-            surfaceTexture.getTransformMatrix(samplingMatrix);
-            rotatedSamplingMatrix =
-                RendererCommon.rotateTextureMatrix(samplingMatrix, pendingFrame.rotationDegree);
-
+            // External texture rendering. Make a deep copy of the external texture.
             // Reallocate offscreen texture if necessary.
             textureCopy.setSize(pendingFrame.rotatedWidth(), pendingFrame.rotatedHeight());