Transfer media::VideoFrame using mojo shared memory

media/mojo/interfaces/media_types.mojom

 // Copyright 2014 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.
 
 module media.interfaces;
 
 import "ui/mojo/geometry/geometry.mojom";
 
 // See media/base/buffering_state.h for descriptions.
 // Kept in sync with media::BufferingState via static_asserts.
@@ skipping 248 matching lines @@
   bool end_of_stream;
 
   // Timestamp in microseconds of the first frame.
   int64 timestamp_usec;
 
   // Channel data. Will be null for EOS buffers.
   array<uint8>? data;
 };
 
 // This defines a mojo transport format for media::VideoFrame.
-// TODO(jrummell): Support shared memory based VideoFrame to avoid copying
-// the data multiple times.
 struct VideoFrame {
   // Format of the frame.
   VideoFormat format;
 
   // Width and height of the video frame, in pixels.
   mojo.Size coded_size;
 
   // Visible size of the frame.
   mojo.Rect visible_rect;
 
   // Natural size of the frame.
   mojo.Size natural_size;
 
   // True if end of stream.
   bool end_of_stream;
 
   // Timestamp in microseconds of the associated frame.
   int64 timestamp_usec;
 
-  // Frame data for each plane. Will be null for EOS buffers.
-  array<uint8>? y_data;
-  array<uint8>? u_data;
-  array<uint8>? v_data;
+  // Reference to the shared memory containing the frame's data.
+  handle<shared_buffer> frame_data;
+  uint64 frame_data_size;
+
+  // Stride and offsets for each plane. Offsets are relative to the start
+  // of |frame_data|.
+  int32 y_stride;
+  int32 u_stride;
+  int32 v_stride;
+  int32 y_offset;
+  int32 u_offset;
+  int32 v_offset;
 };