/
osr_video_consumer.cc
160 lines (130 loc) · 5.28 KB
/
osr_video_consumer.cc
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
// Copyright (c) 2019 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/browser/osr/osr_video_consumer.h"
#include <utility>
#include "media/base/limits.h"
#include "media/base/video_frame_metadata.h"
#include "media/capture/mojom/video_capture_buffer.mojom.h"
#include "media/capture/mojom/video_capture_types.mojom.h"
#include "services/viz/privileged/mojom/compositing/frame_sink_video_capture.mojom-shared.h"
#include "shell/browser/osr/osr_render_widget_host_view.h"
#include "ui/gfx/skbitmap_operations.h"
namespace {
bool IsValidMinAndMaxFrameSize(gfx::Size min_frame_size,
gfx::Size max_frame_size) {
// Returns true if
// 0 < |min_frame_size| <= |max_frame_size| <= media::limits::kMaxDimension.
return 0 < min_frame_size.width() && 0 < min_frame_size.height() &&
min_frame_size.width() <= max_frame_size.width() &&
min_frame_size.height() <= max_frame_size.height() &&
max_frame_size.width() <= media::limits::kMaxDimension &&
max_frame_size.height() <= media::limits::kMaxDimension;
}
} // namespace
namespace electron {
OffScreenVideoConsumer::OffScreenVideoConsumer(
OffScreenRenderWidgetHostView* view,
OnPaintCallback callback)
: callback_(callback),
view_(view),
video_capturer_(view->CreateVideoCapturer()) {
video_capturer_->SetAutoThrottlingEnabled(false);
video_capturer_->SetMinSizeChangePeriod(base::TimeDelta());
video_capturer_->SetFormat(media::PIXEL_FORMAT_ARGB);
SizeChanged(view_->SizeInPixels());
SetFrameRate(view_->GetFrameRate());
}
OffScreenVideoConsumer::~OffScreenVideoConsumer() = default;
void OffScreenVideoConsumer::SetActive(bool active) {
if (active) {
video_capturer_->Start(this, viz::mojom::BufferFormatPreference::kDefault);
} else {
video_capturer_->Stop();
}
}
void OffScreenVideoConsumer::SetFrameRate(int frame_rate) {
video_capturer_->SetMinCapturePeriod(base::Seconds(1) / frame_rate);
}
void OffScreenVideoConsumer::SizeChanged(const gfx::Size& size_in_pixels) {
DCHECK(IsValidMinAndMaxFrameSize(size_in_pixels, size_in_pixels));
video_capturer_->SetResolutionConstraints(size_in_pixels, size_in_pixels,
true);
video_capturer_->RequestRefreshFrame();
}
void OffScreenVideoConsumer::OnFrameCaptured(
::media::mojom::VideoBufferHandlePtr data,
::media::mojom::VideoFrameInfoPtr info,
const gfx::Rect& content_rect,
mojo::PendingRemote<viz::mojom::FrameSinkVideoConsumerFrameCallbacks>
callbacks) {
auto& data_region = data->get_read_only_shmem_region();
if (!CheckContentRect(content_rect)) {
SizeChanged(view_->SizeInPixels());
return;
}
mojo::Remote<viz::mojom::FrameSinkVideoConsumerFrameCallbacks>
callbacks_remote(std::move(callbacks));
if (!data_region.IsValid()) {
callbacks_remote->Done();
return;
}
base::ReadOnlySharedMemoryMapping mapping = data_region.Map();
if (!mapping.IsValid()) {
DLOG(ERROR) << "Shared memory mapping failed.";
callbacks_remote->Done();
return;
}
if (mapping.size() <
media::VideoFrame::AllocationSize(info->pixel_format, info->coded_size)) {
DLOG(ERROR) << "Shared memory size was less than expected.";
callbacks_remote->Done();
return;
}
// The SkBitmap's pixels will be marked as immutable, but the installPixels()
// API requires a non-const pointer. So, cast away the const.
void* const pixels = const_cast<void*>(mapping.memory());
// Call installPixels() with a |releaseProc| that: 1) notifies the capturer
// that this consumer has finished with the frame, and 2) releases the shared
// memory mapping.
struct FramePinner {
// Keeps the shared memory that backs |frame_| mapped.
base::ReadOnlySharedMemoryMapping mapping;
// Prevents FrameSinkVideoCapturer from recycling the shared memory that
// backs |frame_|.
mojo::PendingRemote<viz::mojom::FrameSinkVideoConsumerFrameCallbacks>
releaser;
};
SkBitmap bitmap;
bitmap.installPixels(
SkImageInfo::MakeN32(content_rect.width(), content_rect.height(),
kPremul_SkAlphaType),
pixels,
media::VideoFrame::RowBytes(media::VideoFrame::kARGBPlane,
info->pixel_format, info->coded_size.width()),
[](void* addr, void* context) {
delete static_cast<FramePinner*>(context);
},
new FramePinner{std::move(mapping), callbacks_remote.Unbind()});
bitmap.setImmutable();
absl::optional<gfx::Rect> update_rect = info->metadata.capture_update_rect;
if (!update_rect.has_value() || update_rect->IsEmpty()) {
update_rect = content_rect;
}
callback_.Run(*update_rect, bitmap);
}
void OffScreenVideoConsumer::OnFrameWithEmptyRegionCapture() {}
void OffScreenVideoConsumer::OnStopped() {}
void OffScreenVideoConsumer::OnLog(const std::string& message) {}
bool OffScreenVideoConsumer::CheckContentRect(const gfx::Rect& content_rect) {
gfx::Size view_size = view_->SizeInPixels();
gfx::Size content_size = content_rect.size();
if (std::abs(view_size.width() - content_size.width()) > 2) {
return false;
}
if (std::abs(view_size.height() - content_size.height()) > 2) {
return false;
}
return true;
}
} // namespace electron