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// 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.
#ifndef MEDIA_BLINK_VIDEO_FRAME_COMPOSITOR_H_
#define MEDIA_BLINK_VIDEO_FRAME_COMPOSITOR_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "cc/layers/video_frame_provider.h"
#include "media/base/media_export.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class VideoFrame;
// VideoFrameCompositor handles incoming frames by notifying the compositor and
// dispatching callbacks when detecting changes in video frames.
//
// Typical usage is to deliver ready-to-be-displayed video frames to
// UpdateCurrentFrame() so that VideoFrameCompositor can take care of tracking
// changes in video frames and firing callbacks as needed.
//
// VideoFrameCompositor must live on the same thread as the compositor.
class MEDIA_EXPORT VideoFrameCompositor
: NON_EXPORTED_BASE(public cc::VideoFrameProvider) {
public:
// |natural_size_changed_cb| is run with the new natural size of the video
// frame whenever a change in natural size is detected. It is not called the
// first time UpdateCurrentFrame() is called. Run on the same thread as the
// caller of UpdateCurrentFrame().
//
// |opacity_changed_cb| is run when a change in opacity is detected. It *is*
// called the first time UpdateCurrentFrame() is called. Run on the same
// thread as the caller of UpdateCurrentFrame().
//
// TODO(scherkus): Investigate the inconsistency between the callbacks with
// respect to why we don't call |natural_size_changed_cb| on the first frame.
// I suspect it was for historical reasons that no longer make sense.
VideoFrameCompositor(
const base::Callback<void(gfx::Size)>& natural_size_changed_cb,
const base::Callback<void(bool)>& opacity_changed_cb);
~VideoFrameCompositor() override;
// cc::VideoFrameProvider implementation.
void SetVideoFrameProviderClient(
cc::VideoFrameProvider::Client* client) override;
scoped_refptr<VideoFrame> GetCurrentFrame() override;
void PutCurrentFrame(const scoped_refptr<VideoFrame>& frame) override;
// Updates the current frame and notifies the compositor.
void UpdateCurrentFrame(const scoped_refptr<VideoFrame>& frame);
private:
base::Callback<void(gfx::Size)> natural_size_changed_cb_;
base::Callback<void(bool)> opacity_changed_cb_;
cc::VideoFrameProvider::Client* client_;
scoped_refptr<VideoFrame> current_frame_;
DISALLOW_COPY_AND_ASSIGN(VideoFrameCompositor);
};
} // namespace media
#endif // MEDIA_BLINK_VIDEO_FRAME_COMPOSITOR_H_
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