Support for video file instead of camera and output video out to file

webrtc/api/android/java/src/org/webrtc/GlVideoFileRenderer.java

Index: webrtc/api/android/java/src/org/webrtc/GlVideoFileRenderer.java
diff --git a/webrtc/api/android/java/src/org/webrtc/GlVideoFileRenderer.java b/webrtc/api/android/java/src/org/webrtc/GlVideoFileRenderer.java
new file mode 100644
index 0000000000000000000000000000000000000000..b0822d93f4c9b71e2bc48964222d358679a1fda0
--- /dev/null
+++ b/webrtc/api/android/java/src/org/webrtc/GlVideoFileRenderer.java
@@ -0,0 +1,124 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+package org.webrtc;
+
+import android.os.Handler;
+import android.os.HandlerThread;
+
+import java.nio.ByteBuffer;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+/**
+ * Can be used to saves the video frames to file.
+ */
+public class GlVideoFileRenderer implements VideoRenderer.Callbacks {
+  private static final String TAG = "GlVideoFileRenderer";
+
+  private SurfaceTextureHelper.YuvConverter yuvConverter;
+
+  private HandlerThread renderThread;
+
+  private Handler renderThreadHandler;
+
+  private FileOutputStream videoOutFile;
+  private int outputFileWidth;
+  private int outputFileHeight;
+
+  public GlVideoFileRenderer(
+      String outputFile, int outputFileWidth, int outputFileHeight,
+      EglBase.Context sharedContext) throws IOException {
+    yuvConverter = new SurfaceTextureHelper.YuvConverter(
+        sharedContext);
+
+    this.outputFileWidth = outputFileWidth;
+    this.outputFileHeight = outputFileHeight;
+
+    videoOutFile = new FileOutputStream(outputFile);
+    videoOutFile.write((
+          "YUV4MPEG2 C420 W" + outputFileWidth +
+          " H" + outputFileHeight + " Ip F30:1 A1:1\n").getBytes());
+
+    renderThread = new HandlerThread(TAG);
+    renderThread.start();
+    renderThreadHandler = new Handler(renderThread.getLooper());
+  }
+
+  @Override
+  public void renderFrame(final VideoRenderer.I420Frame frame) {
+    renderThreadHandler.post(new Runnable() {
+      @Override
+      public void run() {
+        renderFrameOnRenderThread(frame);
+      }
+    });
+  }
+
+  private void renderFrameOnRenderThread(VideoRenderer.I420Frame frame) {
+    int oesTextureId = frame.textureId;
+    float frameAspectRatio = (frame.rotationDegree % 180 == 0) ?
+      (float) frame.width / frame.height
+      : (float) frame.height / frame.width;
+
+    final float[] rotatedSamplingMatrix =
+      RendererCommon.rotateTextureMatrix(frame.samplingMatrix, frame.rotationDegree);
+    final float[] layoutMatrix = RendererCommon.getLayoutMatrix(
+        false, frameAspectRatio, (float) outputFileWidth / outputFileHeight);
+    final float[] texMatrix = RendererCommon.multiplyMatrices(rotatedSamplingMatrix, layoutMatrix);
+
+    int frameSize = outputFileWidth*outputFileHeight*3/2;
+    ByteBuffer frameBytes = ByteBuffer.allocateDirect(frameSize);
+
+    yuvConverter.convert(
+        frameBytes, outputFileWidth, outputFileHeight, outputFileWidth,
+        oesTextureId, texMatrix);
+
+    VideoRenderer.renderFrameDone(frame);
+
+    try {
+      videoOutFile.write("FRAME\n".getBytes());
+
+      int width = outputFileWidth;
+      int height = outputFileHeight;
+      int stride = width;
+      byte[] data = frameBytes.array();
+      int offset = frameBytes.arrayOffset();
+
+      Logging.d(TAG,
+          "arrayOffset(): " + frameBytes.arrayOffset() +
+          " hasArray: " + frameBytes.hasArray());
+      // Write Y
+      videoOutFile.write(data, offset, width*height);
+
+      // Write U
+      for (int r = height; r<height*3/2; ++r) {
+        videoOutFile.write(data, offset + r * stride, stride / 2);
+      }
+
+      // Write V
+      for (int r = height; r<height*3/2; ++r) {
+        videoOutFile.write(data, offset + r * stride + stride / 2, stride / 2);
+      }
+    }
+    catch (IOException e) {
+      Logging.d(TAG, "Failed to write to file for video out");
+    }
+  }
+
+  public void release() {
+    try {
+      videoOutFile.close();
+    }
+    catch (IOException e) {
+      Logging.d(TAG, "Error closing output video file");
+    }
+  }
+}
+