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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/public/browser/oop_video_decoder_factory.h"
#include "base/containers/queue.h"
#include "components/viz/common/switches.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/gpu_data_manager_observer.h"
#include "content/public/browser/gpu_utils.h"
#include "content/public/browser/service_process_host.h"
#include "media/mojo/mojom/interface_factory.mojom.h"
#include "media/mojo/mojom/video_decoder.mojom.h"
#include "media/mojo/mojom/video_decoder_factory_process.mojom.h"
#include "mojo/public/cpp/bindings/remote_set.h"
namespace content {
#if BUILDFLAG(ALLOW_HOSTING_OOP_VIDEO_DECODER)
namespace {
// OOPVideoDecoderFactoryProcessLauncher is a helper singleton class that
// launches utility processes to host a media::mojom::InterfaceFactory once
// the gpu::GpuFeatureInfo is known.
class OOPVideoDecoderFactoryProcessLauncher final
: public GpuDataManagerObserver {
public:
static OOPVideoDecoderFactoryProcessLauncher& Instance() {
static base::NoDestructor<OOPVideoDecoderFactoryProcessLauncher> instance;
return *instance;
}
OOPVideoDecoderFactoryProcessLauncher(
const OOPVideoDecoderFactoryProcessLauncher&) = delete;
OOPVideoDecoderFactoryProcessLauncher& operator=(
const OOPVideoDecoderFactoryProcessLauncher&) = delete;
void LaunchWhenGpuFeatureInfoIsKnown(
mojo::PendingReceiver<media::mojom::InterfaceFactory> receiver) {
if (gpu_preferences_.disable_accelerated_video_decode) {
return;
}
if (ui_thread_task_runner_->RunsTasksInCurrentSequence()) {
LaunchWhenGpuFeatureInfoIsKnownOnUIThread(std::move(receiver));
return;
}
// base::Unretained(this) is safe because *|this| is never destroyed.
ui_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&OOPVideoDecoderFactoryProcessLauncher::
LaunchWhenGpuFeatureInfoIsKnownOnUIThread,
base::Unretained(this), std::move(receiver)));
}
private:
friend class base::NoDestructor<OOPVideoDecoderFactoryProcessLauncher>;
OOPVideoDecoderFactoryProcessLauncher()
: ui_thread_task_runner_(GetUIThreadTaskRunner({})),
gpu_preferences_(content::GetGpuPreferencesFromCommandLine()) {}
~OOPVideoDecoderFactoryProcessLauncher() final = default;
// GpuDataManagerObserver implementation.
void OnGpuInfoUpdate() final {
if (ui_thread_task_runner_->RunsTasksInCurrentSequence()) {
OnGpuInfoUpdateOnUIThread();
return;
}
// base::Unretained(this) is safe because *|this| is never destroyed.
ui_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
&OOPVideoDecoderFactoryProcessLauncher::OnGpuInfoUpdateOnUIThread,
base::Unretained(this)));
}
void OnGpuInfoUpdateOnUIThread() {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
auto* manager = GpuDataManagerImpl::GetInstance();
if (!manager->IsGpuFeatureInfoAvailable()) {
return;
}
gpu_feature_info_ = manager->GetGpuFeatureInfo();
while (!pending_factory_receivers_.empty()) {
auto factory_receiver = std::move(pending_factory_receivers_.front());
pending_factory_receivers_.pop();
LaunchOnUIThread(std::move(factory_receiver));
}
}
void LaunchWhenGpuFeatureInfoIsKnownOnUIThread(
mojo::PendingReceiver<media::mojom::InterfaceFactory> receiver) {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
if (gpu_feature_info_) {
LaunchOnUIThread(std::move(receiver));
return;
}
pending_factory_receivers_.emplace(std::move(receiver));
GpuDataManagerImpl::GetInstance()->AddObserver(this);
OnGpuInfoUpdateOnUIThread();
}
void LaunchOnUIThread(
mojo::PendingReceiver<media::mojom::InterfaceFactory> receiver) {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
if (gpu_feature_info_
->status_values[gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_DECODE] !=
gpu::kGpuFeatureStatusEnabled) {
return;
}
mojo::Remote<media::mojom::VideoDecoderFactoryProcess> process;
ServiceProcessHost::Launch(
process.BindNewPipeAndPassReceiver(),
ServiceProcessHost::Options().WithDisplayName("Video Decoder").Pass());
process->InitializeVideoDecoderFactory(*gpu_feature_info_,
std::move(receiver));
processes_.Add(std::move(process));
}
const scoped_refptr<base::SequencedTaskRunner> ui_thread_task_runner_;
const gpu::GpuPreferences gpu_preferences_;
SEQUENCE_CHECKER(ui_sequence_checker_);
// Each utility process launched by this class hosts an
// OOPVideoDecoderFactoryProcess implementation which is used to broker an
// InterfaceFactory connection. The process stays alive until either
// a) the OOPVideoDecoderFactoryProcess connection is lost, or b) it
// crashes. Case (a) will typically happen when the client that uses the
// InterfaceFactory connection closes its endpoint (e.g., a renderer
// process dies). In that situation, the utility process should detect that
// the InterfaceFactory connection got lost and subsequently close
// the OOPVideoDecoderFactoryProcess connection which should cause the
// termination of the process. We need to keep the
// OOPVideoDecoderFactoryProcess connection endpoint in a RemoteSet to keep
// the process alive until the InterfaceFactory connection is lost.
mojo::RemoteSet<media::mojom::VideoDecoderFactoryProcess> processes_
GUARDED_BY_CONTEXT(ui_sequence_checker_);
std::optional<gpu::GpuFeatureInfo> gpu_feature_info_
GUARDED_BY_CONTEXT(ui_sequence_checker_);
// This member holds onto any requests for an InterfaceFactory until
// the gpu::GpuFeatureInfo is known.
base::queue<mojo::PendingReceiver<media::mojom::InterfaceFactory>>
pending_factory_receivers_ GUARDED_BY_CONTEXT(ui_sequence_checker_);
};
} // namespace
#endif // BUILDFLAG(ALLOW_HOSTING_OOP_VIDEO_DECODER)
void LaunchOOPVideoDecoderFactory(
mojo::PendingReceiver<media::mojom::InterfaceFactory> receiver) {
#if BUILDFLAG(ALLOW_HOSTING_OOP_VIDEO_DECODER)
OOPVideoDecoderFactoryProcessLauncher::Instance()
.LaunchWhenGpuFeatureInfoIsKnown(std::move(receiver));
#endif
}
} // namespace content
|
