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// Copyright 2013 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 CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_
#define CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "cc/base/cc_export.h"
#include "cc/layers/video_frame_provider.h"
#include "cc/scheduler/video_frame_controller.h"
#include "ui/gfx/transform.h"
namespace media { class VideoFrame; }
namespace cc {
class VideoLayerImpl;
// VideoFrameProviderClientImpl liasons with the VideoFrameProvider and the
// VideoLayer. It receives updates from the provider and updates the layer as a
// result. It also allows the layer to access the video frame that the provider
// has.
class CC_EXPORT VideoFrameProviderClientImpl
: public VideoFrameProvider::Client,
public VideoFrameController,
public base::RefCounted<VideoFrameProviderClientImpl> {
public:
// Must be created on the impl thread while the main thread is blocked.
static scoped_refptr<VideoFrameProviderClientImpl> Create(
VideoFrameProvider* provider,
VideoFrameControllerClient* client);
VideoLayerImpl* ActiveVideoLayer() const;
void SetActiveVideoLayer(VideoLayerImpl* video_layer);
bool Stopped() const;
// Must be called on the impl thread while the main thread is blocked.
void Stop();
scoped_refptr<media::VideoFrame> AcquireLockAndCurrentFrame();
void PutCurrentFrame();
void ReleaseLock();
const gfx::Transform& StreamTextureMatrix() const;
// VideoFrameController implementation.
void OnBeginFrame(const BeginFrameArgs& args) override;
// VideoFrameProvider::Client implementation.
// Called on the main thread.
void StopUsingProvider() override;
// Called on the impl thread.
void StartRendering() override;
void StopRendering() override;
void DidReceiveFrame() override;
void DidUpdateMatrix(const float* matrix) override;
private:
friend class base::RefCounted<VideoFrameProviderClientImpl>;
VideoFrameProviderClientImpl(VideoFrameProvider* provider,
VideoFrameControllerClient* client);
~VideoFrameProviderClientImpl() override;
VideoFrameProvider* provider_;
VideoFrameControllerClient* client_;
VideoLayerImpl* active_video_layer_;
bool stopped_;
// Since the provider lives on another thread, it can be destroyed while the
// frame controller are accessing its frame. Before being destroyed the
// provider calls StopUsingProvider. provider_lock_ blocks StopUsingProvider
// from returning until the frame controller is done using the frame.
base::Lock provider_lock_;
base::ThreadChecker thread_checker_;
gfx::Transform stream_texture_matrix_;
DISALLOW_COPY_AND_ASSIGN(VideoFrameProviderClientImpl);
};
} // namespace cc
#endif // CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_
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