media: Implement zero-copy video playback for ffmpeg.

media/video/gpu_memory_buffer_video_frame_pool.h

 // Copyright 2015 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_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_
 #define MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/video_frame.h"
@@ skipping 48 matching lines @@
       GpuVideoAcceleratorFactories* gpu_factories);
   virtual ~GpuMemoryBufferVideoFramePool();
 
   // Create VideoFrameFuture backed by native textures.
   std::unique_ptr<VideoFrameFuture> CreateFrame(VideoPixelFormat format,
                                                 const gfx::Size& coded_size,
                                                 const gfx::Rect& visible_rect,
                                                 const gfx::Size& natural_size,
                                                 base::TimeDelta timestamp);
 
+  enum class Usage {
+    GENERIC,
+    // FFMPEG requires wide padding.
+    FFMPEG,
+
+    LAST = FFMPEG
+  };
+  void SetUsage(Usage usage);
+
   // The number of output planes to be copied in each iteration.
   static size_t PlanesPerCopy(VideoPixelFormat format, size_t plane);
 
  private:
   class PoolImpl;
   scoped_refptr<PoolImpl> pool_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferVideoFramePool);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_GPU_MEMORY_BUFFER_VIDEO_FRAME_POOL_H_