media: Implement zero-copy video playback for ffmpeg.

media/video/hybrid_video_frame_pool.h

Index: media/video/hybrid_video_frame_pool.h
diff --git a/media/video/hybrid_video_frame_pool.h b/media/video/hybrid_video_frame_pool.h
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+// Copyright 2016 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_HYBRID_VIDEO_FRAME_POOL_H_
+#define MEDIA_VIDEO_HYBRID_VIDEO_FRAME_POOL_H_
+
+#include "base/macros.h"
+#include "media/video/gpu_memory_buffer_video_frame_pool.h"
+
+namespace media {
+// Interface to a pool of VideoFrames backed by GpuMemoryBuffers/textures/images
+// or system memory. When |format| is supported by GpuMemoryBuffers, it provides
+// VideoFrameFuture backed by GpuMemoryBuffers. Otherwise, it provides
+// VideoFrameFuture backed by system memory.
+// TODO(dshwang): when GpuMemoryBufferVideoFramePool supports all YUV format,
+// remove this class.
+class MEDIA_EXPORT HybridVideoFramePool {
+ public:
+  explicit HybridVideoFramePool(
+      std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_video_frame_pool);
+  virtual ~HybridVideoFramePool();
+
+  // Create VideoFrameFuture backed by native textures or system memory.
+  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);
+
+ private:
+  class PoolImpl;
+  std::unique_ptr<PoolImpl> pool_impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(HybridVideoFramePool);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_HYBRID_VIDEO_FRAME_POOL_H_