Android MediaCodecVideoDecoder: Manage lifetime of texture frames

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

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 414 matching lines @@
     final VideoRenderer.I420Frame frame;
     synchronized (frameLock) {
       if (pendingFrame == null) {
         return;
       }
       frame = pendingFrame;
       pendingFrame = null;
     }
 
     final long startTimeNs = System.nanoTime();
-    final float[] samplingMatrix;
-    if (frame.yuvFrame) {
-      // 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.
-      samplingMatrix = RendererCommon.verticalFlipMatrix();
-    } else {
-      // TODO(magjed): Move updateTexImage() to the video source instead.
-      SurfaceTexture surfaceTexture = (SurfaceTexture) frame.textureObject;
-      surfaceTexture.updateTexImage();
-      samplingMatrix = new float[16];
-      surfaceTexture.getTransformMatrix(samplingMatrix);
-    }
-
     final float[] texMatrix;
     synchronized (layoutLock) {
       final float[] rotatedSamplingMatrix =
-          RendererCommon.rotateTextureMatrix(samplingMatrix, frame.rotationDegree);
+          RendererCommon.rotateTextureMatrix(frame.samplingMatrix, frame.rotationDegree);
       final float[] layoutMatrix = RendererCommon.getLayoutMatrix(
           mirror, frameAspectRatio(), (float) layoutWidth / layoutHeight);
       texMatrix = RendererCommon.multiplyMatrices(rotatedSamplingMatrix, layoutMatrix);
     }
 
     GLES20.glViewport(0, 0, surfaceWidth, surfaceHeight);
     if (frame.yuvFrame) {
       // Make sure YUV textures are allocated.
       if (yuvTextures == null) {
         yuvTextures = new int[3];
@@ skipping 62 matching lines @@
       if (framesReceived > 0 && framesRendered > 0) {
         final long timeSinceFirstFrameNs = System.nanoTime() - firstFrameTimeNs;
         Logging.d(TAG, "Duration: " + (int) (timeSinceFirstFrameNs / 1e6) +
             " ms. FPS: " + (float) framesRendered * 1e9 / timeSinceFirstFrameNs);
         Logging.d(TAG, "Average render time: "
             + (int) (renderTimeNs / (1000 * framesRendered)) + " us.");
       }
     }
   }
 }