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

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

Index: webrtc/api/android/java/src/org/webrtc/VideoFileRenderer.java
diff --git a/webrtc/api/android/java/src/org/webrtc/VideoFileRenderer.java b/webrtc/api/android/java/src/org/webrtc/VideoFileRenderer.java
new file mode 100644
index 0000000000000000000000000000000000000000..cbe3f924919c13a7aab6b03878cc4e9874a11590
--- /dev/null
+++ b/webrtc/api/android/java/src/org/webrtc/VideoFileRenderer.java
@@ -0,0 +1,135 @@
+/*
+ *  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;
+import java.util.concurrent.CountDownLatch;
+
+/**
+ * Can be used to save the video frames to file.
+ */
+public class VideoFileRenderer implements VideoRenderer.Callbacks {
+  private static final String TAG = "VideoFileRenderer";
+
+  private final SurfaceTextureHelper.YuvConverter yuvConverter;
+  private final HandlerThread renderThread;
+  private final Object handlerLock = new Object();
+  private final Handler renderThreadHandler;
+  private final FileOutputStream videoOutFile;
+  private final int outputFileWidth;
+  private final int outputFileHeight;
+  private final int outputFrameSize;
+  private final ByteBuffer outputFrameBuffer;
+
+  public VideoFileRenderer(String outputFile, int outputFileWidth, int outputFileHeight,
+      EglBase.Context sharedContext) throws IOException {
+    if ((outputFileWidth % 2) == 1 || (outputFileHeight % 2) == 1) {
+      throw new IllegalArgumentException("Does not support uneven width or height");
+    }
+    yuvConverter = new SurfaceTextureHelper.YuvConverter(sharedContext);
+
+    this.outputFileWidth = outputFileWidth;
+    this.outputFileHeight = outputFileHeight;
+
+    outputFrameSize = outputFileWidth * outputFileHeight * 3 / 2;
+    outputFrameBuffer = ByteBuffer.allocateDirect(outputFrameSize);
+
+    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) {
+    final float frameAspectRatio = (float) frame.rotatedWidth() / (float) frame.rotatedHeight();
+
+    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);
+
+    try {
+      videoOutFile.write("FRAME\n".getBytes());
+      if (!frame.yuvFrame) {
+        yuvConverter.convert(outputFrameBuffer, outputFileWidth, outputFileHeight, outputFileWidth,
+            frame.textureId, texMatrix);
+
+        int stride = outputFileWidth;
+        byte[] data = outputFrameBuffer.array();
+        int offset = outputFrameBuffer.arrayOffset();
+
+        // Write Y
+        videoOutFile.write(data, offset, outputFileWidth * outputFileHeight);
+
+        // Write U
+        for (int r = outputFileHeight; r < outputFileHeight * 3 / 2; ++r) {
+          videoOutFile.write(data, offset + r * stride, stride / 2);
+        }
+
+        // Write V
+        for (int r = outputFileHeight; r < outputFileHeight * 3 / 2; ++r) {
+          videoOutFile.write(data, offset + r * stride + stride / 2, stride / 2);
+        }
+      } else {
+        nativeI420Scale(frame.yuvPlanes[0], frame.yuvStrides[0], frame.yuvPlanes[1],
+            frame.yuvStrides[1], frame.yuvPlanes[2], frame.yuvStrides[2], frame.width, frame.height,
+            outputFrameBuffer, outputFileWidth, outputFileHeight);
+        videoOutFile.write(
+            outputFrameBuffer.array(), outputFrameBuffer.arrayOffset(), outputFrameSize);
+      }
+    } catch (IOException e) {
+      Logging.e(TAG, "Failed to write to file for video out");
+      throw new RuntimeException(e);
+    } finally {
+      VideoRenderer.renderFrameDone(frame);
+    }
+  }
+
+  public void release() {
+    final CountDownLatch cleanupBarrier = new CountDownLatch(1);
+    renderThreadHandler.post(new Runnable() {
+      @Override
+      public void run() {
+        try {
+          videoOutFile.close();
+        } catch (IOException e) {
+          Logging.d(TAG, "Error closing output video file");
+        }
+        cleanupBarrier.countDown();
+      }
+    });
+    ThreadUtils.awaitUninterruptibly(cleanupBarrier);
+    renderThread.quit();
+  }
+
+  public static native void nativeI420Scale(ByteBuffer srcY, int strideY, ByteBuffer srcU,
+      int strideU, ByteBuffer srcV, int strideV, int width, int height, ByteBuffer dst,
+      int dstWidth, int dstHeight);
+}