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
169
170
171
172
173
174
175
176
177
178
179
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CaptureTask.h"
#include "mozilla/dom/ImageCapture.h"
#include "mozilla/dom/ImageCaptureError.h"
#include "mozilla/dom/ImageEncoder.h"
#include "mozilla/dom/MediaStreamTrack.h"
#include "mozilla/dom/VideoStreamTrack.h"
#include "gfxUtils.h"
#include "nsThreadUtils.h"
namespace mozilla {
CaptureTask::CaptureTask(dom::ImageCapture* aImageCapture)
: mImageCapture(aImageCapture)
, mEventListener(new MediaStreamEventListener(this))
, mImageGrabbedOrTrackEnd(false)
, mPrincipalChanged(false)
{
}
nsresult
CaptureTask::TaskComplete(already_AddRefed<dom::Blob> aBlob, nsresult aRv)
{
MOZ_ASSERT(NS_IsMainThread());
DetachTrack();
nsresult rv;
RefPtr<dom::Blob> blob(aBlob);
// We have to set the parent because the blob has been generated with a valid one.
if (blob) {
blob = dom::Blob::Create(mImageCapture->GetParentObject(), blob->Impl());
}
if (mPrincipalChanged) {
aRv = NS_ERROR_DOM_SECURITY_ERR;
IC_LOG("MediaStream principal should not change during TakePhoto().");
}
if (NS_SUCCEEDED(aRv)) {
rv = mImageCapture->PostBlobEvent(blob);
} else {
rv = mImageCapture->PostErrorEvent(dom::ImageCaptureError::PHOTO_ERROR, aRv);
}
// Ensure ImageCapture dereference on main thread here because the TakePhoto()
// sequences stopped here.
mImageCapture = nullptr;
return rv;
}
void
CaptureTask::AttachTrack()
{
MOZ_ASSERT(NS_IsMainThread());
dom::VideoStreamTrack* track = mImageCapture->GetVideoStreamTrack();
track->AddPrincipalChangeObserver(this);
track->AddListener(mEventListener.get());
track->AddDirectListener(this);
}
void
CaptureTask::DetachTrack()
{
MOZ_ASSERT(NS_IsMainThread());
dom::VideoStreamTrack* track = mImageCapture->GetVideoStreamTrack();
track->RemovePrincipalChangeObserver(this);
track->RemoveListener(mEventListener.get());
track->RemoveDirectListener(this);
}
void
CaptureTask::PrincipalChanged(dom::MediaStreamTrack* aMediaStreamTrack)
{
MOZ_ASSERT(NS_IsMainThread());
mPrincipalChanged = true;
}
void
CaptureTask::SetCurrentFrames(const VideoSegment& aSegment)
{
if (mImageGrabbedOrTrackEnd) {
return;
}
// Callback for encoding complete, it calls on main thread.
class EncodeComplete : public dom::EncodeCompleteCallback
{
public:
explicit EncodeComplete(CaptureTask* aTask) : mTask(aTask) {}
nsresult ReceiveBlob(already_AddRefed<dom::Blob> aBlob) override
{
RefPtr<dom::Blob> blob(aBlob);
mTask->TaskComplete(blob.forget(), NS_OK);
mTask = nullptr;
return NS_OK;
}
protected:
RefPtr<CaptureTask> mTask;
};
VideoSegment::ConstChunkIterator iter(aSegment);
while (!iter.IsEnded()) {
VideoChunk chunk = *iter;
// Extract the first valid video frame.
VideoFrame frame;
if (!chunk.IsNull()) {
RefPtr<layers::Image> image;
if (chunk.mFrame.GetForceBlack()) {
// Create a black image.
image = VideoFrame::CreateBlackImage(chunk.mFrame.GetIntrinsicSize());
} else {
image = chunk.mFrame.GetImage();
}
MOZ_ASSERT(image);
mImageGrabbedOrTrackEnd = true;
// Encode image.
nsresult rv;
nsAutoString type(NS_LITERAL_STRING("image/jpeg"));
nsAutoString options;
rv = dom::ImageEncoder::ExtractDataFromLayersImageAsync(
type,
options,
false,
image,
new EncodeComplete(this));
if (NS_FAILED(rv)) {
PostTrackEndEvent();
}
return;
}
iter.Next();
}
}
void
CaptureTask::PostTrackEndEvent()
{
mImageGrabbedOrTrackEnd = true;
// Got track end or finish event, stop the task.
class TrackEndRunnable : public Runnable
{
public:
explicit TrackEndRunnable(CaptureTask* aTask)
: mTask(aTask) {}
NS_IMETHOD Run() override
{
mTask->TaskComplete(nullptr, NS_ERROR_FAILURE);
mTask = nullptr;
return NS_OK;
}
protected:
RefPtr<CaptureTask> mTask;
};
IC_LOG("Got MediaStream track removed or finished event.");
NS_DispatchToMainThread(new TrackEndRunnable(this));
}
} // namespace mozilla
|