Add StreamTextureWrapper/StreamTextureWrapperImpl

media/blink/stream_texture_wrapper.h

+// 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_BLINK_STREAM_TEXTURE_WRAPPER_H_
+#define MEDIA_BLINK_STREAM_TEXTURE_WRAPPER_H_
+
+#include "cc/layers/video_frame_provider.h"
+#include "media/base/video_frame.h"
+
+namespace media {
+class VideoFrame;
+
+// StreamTextureWrapper encapsulates a StreamTexture's creation, initialization
+// and registration for later retrieval (in the Browser process).
+//
+// TODO(tguilbert): Support registering the underlying SurfaceTexture so it can
+// be used by a MediaPlayer in the browser process. See crbug.com/627658.
+class MEDIA_EXPORT StreamTextureWrapper {
+ public:
+  StreamTextureWrapper() {}
+
+  // Initialize the underlying StreamTexture.
+  // See StreamTextureWrapperImpl.
+  virtual void Initialize(
+      cc::VideoFrameProvider::Client* client,
+      const gfx::Size& natural_size,
+      scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner,
+      const base::Closure& init_cb) = 0;
+
+  // Called whenever the video's natural size changes.
+  // See StreamTextureWrapperImpl.
+  virtual void UpdateTextureSize(const gfx::Size& natural_size) = 0;
+
+  // Returns the latest frame.
+  // See StreamTextureWrapperImpl.
+  virtual scoped_refptr<VideoFrame> GetCurrentFrame() = 0;
+
+  struct Deleter {
+    inline void operator()(StreamTextureWrapper* ptr) const { ptr->Destroy(); }
+  };
+
+ protected:
+  virtual ~StreamTextureWrapper() {}
+
+  // Safely destroys the StreamTextureWrapper.
+  // See StreamTextureWrapperImpl.
+  virtual void Destroy() = 0;
+};
+
+typedef std::unique_ptr<StreamTextureWrapper, StreamTextureWrapper::Deleter>
+    ScopedStreamTextureWrapper;
+
+}  // namespace media
+
+#endif  // MEDIA_BLINK_STREAM_TEXTURE_WRAPPER_H_