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..379d1f4105412732b28b98694706b244122280d1
--- /dev/null
+++ b/webrtc/api/android/java/src/org/webrtc/VideoFileRenderer.java
@@ -0,0 +1,136 @@
+/*
+ *  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.

[magjed_webrtc, 2016/10/08 10:46:04]

nit spelling: save

+ */
+public class VideoFileRenderer implements VideoRenderer.Callbacks {
+  private static final String TAG = "VideoFileRenderer";
+
+  private final SurfaceTextureHelper.YuvConverter yuvConverter;
+  private final HandlerThread renderThread;
+  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) {
+    float frameAspectRatio = (frame.rotationDegree % 180 == 0) ? (float) frame.width / frame.height

[magjed_webrtc, 2016/10/08 10:46:05]

Write it like this instead:
final float frameAspectRatio = frame.rotatedWidth() / frame.rotatedHeight();

+                                                               : (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);
+
+    if (!frame.yuvFrame) {

[magjed_webrtc, 2016/10/08 10:46:04]

Change the order of the if-statement and the try-statement so you can reuse the
common code:
try {
  videoOutFile.write("FRAME\n".getBytes());
  if (!frame.yuvFrame) {
    ...
  } else {
    ...
  }
} catch (IOException e) {
  Logging.e(TAG, "Failed to write to file for video out", e);
  throw new RuntimeException(e);
} finally {
  VideoRenderer.renderFrameDone(frame);
}

[mandermo, 2016/10/10 12:22:14]

Done.

+      yuvConverter.convert(outputFrameBuffer, outputFileWidth, outputFileHeight, outputFileWidth,
+          frame.textureId, texMatrix);
+
+      VideoRenderer.renderFrameDone(frame);
+
+      try {
+        videoOutFile.write("FRAME\n".getBytes());
+
+        int stride = outputFileWidth;
+        byte[] data = outputFrameBuffer.array();
+        int offset = outputFrameBuffer.arrayOffset();
+
+        Logging.d(TAG, "arrayOffset(): " + outputFrameBuffer.arrayOffset() + " hasArray: "

[magjed_webrtc, 2016/10/08 10:46:04]

Remove the hasArray stuff. If it does not have an array, it will throw an
exception when you call .array() above.

[mandermo, 2016/10/10 12:22:14]

Done.

+                + outputFrameBuffer.hasArray());
+        // 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);
+        }
+      } catch (IOException e) {
+        Logging.e(TAG, "Failed to write to file for video out");
+      }
+    } else {
+      try {
+        videoOutFile.write("FRAME\n".getBytes());
+
+        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() {
+    try {
+      videoOutFile.close();
+    } catch (IOException e) {
+      Logging.d(TAG, "Error closing output video file");

[magjed_webrtc, 2016/10/08 10:46:05]

Include exception in log, add it as the last argument.

[mandermo, 2016/10/10 12:22:13]

Done.

+    }
+  }
+
+  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);
+}