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..afb19b3809ee672e4c6736609fa7e169a791d362
--- /dev/null
+++ b/webrtc/api/android/java/src/org/webrtc/VideoFileRenderer.java
@@ -0,0 +1,153 @@
+/*
+ *  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 VideoFileRenderer implements VideoRenderer.Callbacks {
+  private static final String TAG = "VideoFileRenderer";
+
+  private SurfaceTextureHelper.YuvConverter yuvConverter;

[sakal, 2016/10/05 13:28:41]

final

+  private HandlerThread renderThread;

[sakal, 2016/10/05 13:28:41]

final

+  private Handler renderThreadHandler;

[sakal, 2016/10/05 13:28:41]

final

+  private FileOutputStream videoOutFile;

[sakal, 2016/10/05 13:28:41]

final

+  private int outputFileWidth;

[sakal, 2016/10/05 13:28:41]

final

+  private int outputFileHeight;

[sakal, 2016/10/05 13:28:40]

final

+  private int outputFrameSize;

[sakal, 2016/10/05 13:28:41]

final

+  private ByteBuffer outputFrameBuffer;

[sakal, 2016/10/05 13:28:41]

final

+
+  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
+      : (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 oesTextureId = frame.textureId;

[sakal, 2016/10/05 13:28:41]

nit: I don't see why you need this variable

[mandermo, 2016/10/07 11:33:40]

Removed and using frame.textureId instead of oesTextureId.

+
+    if (!frame.yuvFrame) {
+      yuvConverter.convert(
+          outputFrameBuffer, outputFileWidth, outputFileHeight, outputFileWidth,
+          oesTextureId, texMatrix);
+
+      VideoRenderer.renderFrameDone(frame);
+
+      try {
+        videoOutFile.write("FRAME\n".getBytes());
+
+        int width = outputFileWidth;

[sakal, 2016/10/05 13:28:41]

nit: I'd prefer removing these width/height variables. They are not really
needed.

[mandermo, 2016/10/07 11:33:40]

Done.

+        int height = outputFileHeight;
+        int stride = width;
+        byte[] data = outputFrameBuffer.array();
+        int offset = outputFrameBuffer.arrayOffset();
+
+        Logging.d(TAG,
+            "arrayOffset(): " + outputFrameBuffer.arrayOffset() +
+            " hasArray: " + outputFrameBuffer.hasArray());
+        // Write Y
+        videoOutFile.write(data, offset, width * height);
+
+        // Write U
+        for (int r = height; r<height * 3 / 2; ++r) {

[sakal, 2016/10/05 13:28:41]

nit: why r instead of more standard i?

[sakal, 2016/10/05 13:28:41]

Add spaces around <

[mandermo, 2016/10/07 11:33:40]

It is r for row. Should I change to i or add comment?

+          videoOutFile.write(data, offset + r * stride, stride / 2);
+        }
+
+        // Write V
+        for (int r = height; r<height * 3 / 2; ++r) {

[sakal, 2016/10/05 13:28:41]

ditto

[mandermo, 2016/10/07 11:33:40]

Done.

+          videoOutFile.write(data, offset + r * stride + stride / 2, stride / 2);
+        }
+      } catch (IOException e) {
+        Logging.d(TAG, "Failed to write to file for video out");

[sakal, 2016/10/05 13:28:40]

Logging.e

+      }
+    } 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.d(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");

[sakal, 2016/10/05 13:28:41]

Logging.e

[mandermo, 2016/10/07 11:33:40]

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);
+}
+