1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
// Copyright 2013 The Chromium Authors
// 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 <optional>
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "cc/cc_export.h"
#include "cc/layers/video_frame_provider.h"
#include "cc/scheduler/video_frame_controller.h"
#include "ui/gfx/geometry/transform.h"
namespace media { class VideoFrame; }
namespace cc {
class VideoLayerImpl;
// VideoFrameProviderClientImpl liaisons 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);
VideoFrameProviderClientImpl(const VideoFrameProviderClientImpl&) = delete;
VideoFrameProviderClientImpl& operator=(const VideoFrameProviderClientImpl&) =
delete;
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()
EXCLUSIVE_LOCK_FUNCTION(provider_lock_);
void PutCurrentFrame() EXCLUSIVE_LOCKS_REQUIRED(provider_lock_);
void ReleaseLock() UNLOCK_FUNCTION(provider_lock_);
void AssertLocked() const ASSERT_EXCLUSIVE_LOCK(provider_lock_) {
provider_lock_.AssertAcquired();
}
bool HasCurrentFrame();
std::optional<base::TimeDelta> GetPreferredRenderInterval();
// VideoFrameController implementation.
void OnBeginFrame(const viz::BeginFrameArgs& args) override;
void DidDrawFrame() 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;
bool IsDrivingFrameUpdates() const override;
const VideoFrameProvider* get_provider_for_testing() const {
return provider_;
}
private:
friend class base::RefCounted<VideoFrameProviderClientImpl>;
VideoFrameProviderClientImpl(VideoFrameProvider* provider,
VideoFrameControllerClient* client);
~VideoFrameProviderClientImpl() override;
raw_ptr<VideoFrameProvider> provider_;
raw_ptr<VideoFrameControllerClient> client_;
raw_ptr<VideoLayerImpl> active_video_layer_;
bool stopped_;
bool rendering_;
bool needs_put_current_frame_;
// 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_;
};
} // namespace cc
#endif // CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_
|
