media/vpx: Add support for VP9 alpha channel

media/base/video_frame.h

 // Copyright (c) 2012 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 MEDIA_BASE_VIDEO_FRAME_H_
 #define MEDIA_BASE_VIDEO_FRAME_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 176 matching lines @@
       int32_t u_stride,
       int32_t v_stride,
       uint8_t* y_data,
       uint8_t* u_data,
       uint8_t* v_data,
       const gfx::GpuMemoryBufferHandle& y_handle,
       const gfx::GpuMemoryBufferHandle& u_handle,
       const gfx::GpuMemoryBufferHandle& v_handle,
       base::TimeDelta timestamp);
 
+  // Wraps external YUVA data of the given parameters with a VideoFrame.
+  // The returned VideoFrame does not own the data passed in.
+  static scoped_refptr<VideoFrame> WrapExternalYuvaData(
+      VideoPixelFormat format,
+      const gfx::Size& coded_size,
+      const gfx::Rect& visible_rect,
+      const gfx::Size& natural_size,
+      int32_t y_stride,
+      int32_t u_stride,
+      int32_t v_stride,
+      int32_t a_stride,
+      uint8_t* y_data,
+      uint8_t* u_data,
+      uint8_t* v_data,
+      uint8_t* a_data,
+      base::TimeDelta timestamp);
+
 #if defined(OS_LINUX)
   // Wraps provided dmabufs
   // (https://www.kernel.org/doc/Documentation/dma-buf-sharing.txt) with a
   // VideoFrame. The dmabuf fds are dup()ed on creation, so that the VideoFrame
   // retains a reference to them, and are automatically close()d on destruction,
   // dropping the reference. The caller may safely close() its reference after
   // calling WrapExternalDmabufs().
   // The image data is only accessible via dmabuf fds, which are usually passed
   // directly to a hardware device and/or to another process, or can also be
   // mapped via mmap() for CPU access.
@@ skipping 349 matching lines @@
 
   // Generated at construction time.
   const int unique_id_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoFrame);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_H_