Android MediaCodecVideoDecoder: Manage lifetime of texture frames

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

 /*
  * libjingle
  * Copyright 2014 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 18 matching lines @@
 
 import java.util.ArrayList;
 import java.util.concurrent.CountDownLatch;
 
 import javax.microedition.khronos.egl.EGLConfig;
 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.EGL14;
 import android.opengl.EGLContext;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
 
 import org.webrtc.Logging;
 import org.webrtc.VideoRenderer.I420Frame;
 
 /**
  * Efficiently renders YUV frames using the GPU for CSC.
@@ skipping 189 matching lines @@
       long now = System.nanoTime();
 
       final boolean isNewFrame;
       synchronized (pendingFrameLock) {
         isNewFrame = (pendingFrame != null);
         if (isNewFrame && startTimeNs == -1) {
           startTimeNs = now;
         }
 
         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());
 
             // Bind our offscreen framebuffer.
             GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, textureCopy.getFrameBufferId());
             GlUtil.checkNoGLES2Error("glBindFramebuffer");
 
             // Copy the OES texture content. This will also normalize the sampling matrix.
              GLES20.glViewport(0, 0, textureCopy.getWidth(), textureCopy.getHeight());
              drawer.drawOes(pendingFrame.textureId, rotatedSamplingMatrix);
@@ skipping 379 matching lines @@
     GLES20.glViewport(0, 0, screenWidth, screenHeight);
     GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
     synchronized (yuvImageRenderers) {
       for (YuvImageRenderer yuvImageRenderer : yuvImageRenderers) {
         yuvImageRenderer.draw(drawer);
       }
     }
   }
 
 }