Add PP_VideoFrame, PPB_VideoReader, and PPB_VideoWriter APIs to Pepper.

ppapi/cpp/video_frame.h

Index: ppapi/cpp/video_frame.h
diff --git a/ppapi/cpp/video_frame.h b/ppapi/cpp/video_frame.h
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+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_CPP_VIDEO_FRAME_H_
+#define PPAPI_CPP_VIDEO_FRAME_H_
+
+#include "ppapi/c/pp_time.h"
+#include "ppapi/c/pp_video_frame.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/pass_ref.h"
+
+/// @file
+/// This file defines the video frame struct used by video readers and writers.
+
+namespace pp {
+
+// VideoFrame ------------------------------------------------------------------
+
+/// The <code>VideoFrame</code> class represents a frame of video in a stream.
+class VideoFrame {
+ public:
+  /// Default constructor for creating a <code>VideoFrame</code> object.
+  VideoFrame();
+
+  /// Constructor that takes an existing <code>PP_VideoFrame</code> structure.
+  /// The 'image_data' PP_Resource field in the structure will be managed by
+  /// this instance.
+  VideoFrame(PassRef, const PP_VideoFrame& pp_video_frame);
+
+  /// Constructor that takes an existing <code>ImageData</code> instance and
+  /// a timestamp.
+  VideoFrame(const ImageData& image_data, PP_TimeTicks timestamp);
+
+  /// The copy constructor for <code>VideoFrame</code>.
+  ///
+  /// @param[in] other A reference to a <code>VideoFrame</code>.
+  VideoFrame(const VideoFrame& other);
+
+  ~VideoFrame();
+
+  VideoFrame& operator=(const VideoFrame& other);
+
+  const PP_VideoFrame& pp_video_frame() const {
+    return video_frame_;
+  }
+
+  ImageData image_data() const {
+    return image_data_;
+  }
+  void set_image_data(const ImageData& image_data) {
+    image_data_ = image_data;
+    // The assignment above manages the underlying PP_Resources. Copy the new
+    // one into our internal video frame struct.
+    video_frame_.image_data = image_data_.pp_resource();
+  }
+
+  PP_TimeTicks timestamp() const { return video_frame_.timestamp; }
+  void set_timestamp(PP_TimeTicks timestamp) {
+    video_frame_.timestamp = timestamp;
+  }
+
+ private:
+  ImageData image_data_;  // This manages the PP_Resource in video_frame_.
+  PP_VideoFrame video_frame_;
+};
+
+namespace internal {
+
+// A specialization of CallbackOutputTraits to provide the callback system the
+// information on how to handle pp::VideoFrame. This converts PP_VideoFrame to
+// pp::VideoFrame when passing to the plugin, and specifically manages the
+// PP_Resource embedded in the video_frame_ field.
+template<>
+struct CallbackOutputTraits<pp::VideoFrame> {
+  typedef PP_VideoFrame* APIArgType;
+  typedef PP_VideoFrame StorageType;
+
+  static inline APIArgType StorageToAPIArg(StorageType& t) {
+    return &t;
+  }
+
+  static inline pp::VideoFrame StorageToPluginArg(StorageType& t) {
+    return pp::VideoFrame(PASS_REF, t);
+  }
+};
+
+}  // namespace internal
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_VIDEO_FRAME_H_