[WebRTC] updated to upstream branch 49 and related.

this patch is based on 38d7a7883...226f2f0bd

dom/media/systemservices/VideoFrameUtils.h

@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et ft=cpp : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_VideoFrameUtil_h
+#define mozilla_VideoFrameUtil_h
+
+#include "mozilla/camera/PCameras.h"
+
+namespace webrtc {
+  class VideoFrame;
+}
+
+namespace mozilla
+{
+  class ShmemBuffer;
+
+// Util methods for working with webrtc::VideoFrame(s) and
+// the IPC classes that are used to deliver their contents to the
+// MediaEnginge
+
+class VideoFrameUtils {
+public:
+
+  // Returns the total number of bytes necessary to copy a VideoFrame's buffer
+  // across all planes.
+  static size_t TotalRequiredBufferSize(const webrtc::VideoFrame & frame);
+
+  // Initializes a camera::VideoFrameProperties from a VideoFrameBuffer
+  static void InitFrameBufferProperties(const webrtc::VideoFrame& aVideoFrame,
+                camera::VideoFrameProperties & aDestProperties);
+
+  // Copies the buffers out of a VideoFrameBuffer into a buffer.
+  // Attempts to make as few memcopies as possible.
+  static void CopyVideoFrameBuffers(uint8_t * aDestBuffer,
+                         const size_t aDestBufferSize,
+                         const webrtc::VideoFrame & aVideoFrame);
+
+  // Copies the buffers in a VideoFrameBuffer into a Shmem
+  // returns the eno from the underlying memcpy.
+  static void CopyVideoFrameBuffers(ShmemBuffer & aDestShmem,
+                         const webrtc::VideoFrame & aVideoFrame);
+
+
+};
+
+} /* namespace mozilla */
+
+#endif