| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 // | |
| 5 // Implementation notes about interactions with VideoCaptureImpl. | |
| 6 // | |
| 7 // How is VideoCaptureImpl used: | |
| 8 // | |
| 9 // VideoCaptureImpl is an IO thread object while VideoCaptureImplManager | |
| 10 // lives only on the render thread. It is only possible to access an | |
| 11 // object of VideoCaptureImpl via a task on the IO thread. | |
| 12 // | |
| 13 // How is VideoCaptureImpl deleted: | |
| 14 // | |
| 15 // A task is posted to the IO thread to delete a VideoCaptureImpl. | |
| 16 // Immediately after that the pointer to it is dropped. This means no | |
| 17 // access to this VideoCaptureImpl object is possible on the render | |
| 18 // thread. Also note that VideoCaptureImpl does not post task to itself. | |
| 19 // | |
| 20 // The use of Unretained: | |
| 21 // | |
| 22 // We make sure deletion is the last task on the IO thread for a | |
| 23 // VideoCaptureImpl object. This allows the use of Unretained() binding. | |
| 24 | |
| 25 #include "content/renderer/media/video_capture_impl_manager.h" | |
| 26 | |
| 27 #include "base/bind.h" | |
| 28 #include "base/bind_helpers.h" | |
| 29 #include "content/child/child_process.h" | |
| 30 #include "content/renderer/media/video_capture_impl.h" | |
| 31 #include "content/renderer/media/video_capture_message_filter.h" | |
| 32 #include "media/base/bind_to_current_loop.h" | |
| 33 | |
| 34 namespace content { | |
| 35 | |
| 36 VideoCaptureImplManager::VideoCaptureImplManager() | |
| 37 : next_client_id_(0), | |
| 38 filter_(new VideoCaptureMessageFilter()), | |
| 39 weak_factory_(this) { | |
| 40 } | |
| 41 | |
| 42 VideoCaptureImplManager::~VideoCaptureImplManager() { | |
| 43 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 44 if (devices_.empty()) | |
| 45 return; | |
| 46 // Forcibly release all video capture resources. | |
| 47 for (VideoCaptureDeviceMap::iterator it = devices_.begin(); | |
| 48 it != devices_.end(); ++it) { | |
| 49 VideoCaptureImpl* impl = it->second.second; | |
| 50 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 51 FROM_HERE, | |
| 52 base::Bind(&VideoCaptureImpl::DeInit, | |
| 53 base::Unretained(impl))); | |
| 54 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 55 FROM_HERE, | |
| 56 base::Bind(&base::DeletePointer<VideoCaptureImpl>, | |
| 57 base::Unretained(impl))); | |
| 58 } | |
| 59 devices_.clear(); | |
| 60 } | |
| 61 | |
| 62 base::Closure VideoCaptureImplManager::UseDevice( | |
| 63 media::VideoCaptureSessionId id) { | |
| 64 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 65 | |
| 66 VideoCaptureImpl* impl = NULL; | |
| 67 VideoCaptureDeviceMap::iterator it = devices_.find(id); | |
| 68 if (it == devices_.end()) { | |
| 69 impl = CreateVideoCaptureImplForTesting(id, filter_.get()); | |
| 70 if (!impl) | |
| 71 impl = new VideoCaptureImpl(id, filter_.get()); | |
| 72 devices_[id] = std::make_pair(1, impl); | |
| 73 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 74 FROM_HERE, | |
| 75 base::Bind(&VideoCaptureImpl::Init, | |
| 76 base::Unretained(impl))); | |
| 77 } else { | |
| 78 ++it->second.first; | |
| 79 } | |
| 80 return base::Bind(&VideoCaptureImplManager::UnrefDevice, | |
| 81 weak_factory_.GetWeakPtr(), id); | |
| 82 } | |
| 83 | |
| 84 base::Closure VideoCaptureImplManager::StartCapture( | |
| 85 media::VideoCaptureSessionId id, | |
| 86 const media::VideoCaptureParams& params, | |
| 87 const VideoCaptureStateUpdateCB& state_update_cb, | |
| 88 const VideoCaptureDeliverFrameCB& deliver_frame_cb) { | |
| 89 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 90 VideoCaptureDeviceMap::iterator it = devices_.find(id); | |
| 91 DCHECK(it != devices_.end()); | |
| 92 VideoCaptureImpl* impl = it->second.second; | |
| 93 | |
| 94 // This ID is used to identify a client of VideoCaptureImpl. | |
| 95 const int client_id = ++next_client_id_; | |
| 96 | |
| 97 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 98 FROM_HERE, | |
| 99 base::Bind(&VideoCaptureImpl::StartCapture, | |
| 100 base::Unretained(impl), | |
| 101 client_id, | |
| 102 params, | |
| 103 state_update_cb, | |
| 104 deliver_frame_cb)); | |
| 105 return base::Bind(&VideoCaptureImplManager::StopCapture, | |
| 106 weak_factory_.GetWeakPtr(), | |
| 107 client_id, id); | |
| 108 } | |
| 109 | |
| 110 void VideoCaptureImplManager::GetDeviceSupportedFormats( | |
| 111 media::VideoCaptureSessionId id, | |
| 112 const VideoCaptureDeviceFormatsCB& callback) { | |
| 113 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 114 VideoCaptureDeviceMap::iterator it = devices_.find(id); | |
| 115 DCHECK(it != devices_.end()); | |
| 116 VideoCaptureImpl* impl = it->second.second; | |
| 117 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 118 FROM_HERE, | |
| 119 base::Bind(&VideoCaptureImpl::GetDeviceSupportedFormats, | |
| 120 base::Unretained(impl), callback)); | |
| 121 } | |
| 122 | |
| 123 void VideoCaptureImplManager::GetDeviceFormatsInUse( | |
| 124 media::VideoCaptureSessionId id, | |
| 125 const VideoCaptureDeviceFormatsCB& callback) { | |
| 126 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 127 VideoCaptureDeviceMap::iterator it = devices_.find(id); | |
| 128 DCHECK(it != devices_.end()); | |
| 129 VideoCaptureImpl* impl = it->second.second; | |
| 130 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 131 FROM_HERE, | |
| 132 base::Bind(&VideoCaptureImpl::GetDeviceFormatsInUse, | |
| 133 base::Unretained(impl), callback)); | |
| 134 } | |
| 135 | |
| 136 VideoCaptureImpl* | |
| 137 VideoCaptureImplManager::CreateVideoCaptureImplForTesting( | |
| 138 media::VideoCaptureSessionId id, | |
| 139 VideoCaptureMessageFilter* filter) const { | |
| 140 return NULL; | |
| 141 } | |
| 142 | |
| 143 void VideoCaptureImplManager::StopCapture( | |
| 144 int client_id, media::VideoCaptureSessionId id) { | |
| 145 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 146 VideoCaptureDeviceMap::iterator it = devices_.find(id); | |
| 147 DCHECK(it != devices_.end()); | |
| 148 VideoCaptureImpl* impl = it->second.second; | |
| 149 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 150 FROM_HERE, | |
| 151 base::Bind(&VideoCaptureImpl::StopCapture, | |
| 152 base::Unretained(impl), client_id)); | |
| 153 } | |
| 154 | |
| 155 void VideoCaptureImplManager::UnrefDevice( | |
| 156 media::VideoCaptureSessionId id) { | |
| 157 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 158 VideoCaptureDeviceMap::iterator it = devices_.find(id); | |
| 159 DCHECK(it != devices_.end()); | |
| 160 VideoCaptureImpl* impl = it->second.second; | |
| 161 | |
| 162 // Unref and destroy on the IO thread if there's no more client. | |
| 163 DCHECK(it->second.first); | |
| 164 --it->second.first; | |
| 165 if (!it->second.first) { | |
| 166 devices_.erase(id); | |
| 167 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 168 FROM_HERE, | |
| 169 base::Bind(&VideoCaptureImpl::DeInit, | |
| 170 base::Unretained(impl))); | |
| 171 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 172 FROM_HERE, | |
| 173 base::Bind(&base::DeletePointer<VideoCaptureImpl>, | |
| 174 base::Unretained(impl))); | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 void VideoCaptureImplManager::SuspendDevices(bool suspend) { | |
| 179 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 180 for (VideoCaptureDeviceMap::iterator it = devices_.begin(); | |
| 181 it != devices_.end(); ++it) { | |
| 182 VideoCaptureImpl* impl = it->second.second; | |
| 183 ChildProcess::current()->io_message_loop_proxy()->PostTask( | |
| 184 FROM_HERE, | |
| 185 base::Bind(&VideoCaptureImpl::SuspendCapture, | |
| 186 base::Unretained(impl), suspend)); | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 } // namespace content | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 960103002:
Rename VideoCaptureImplManager to VideoCaptureService
Base URL: https://chromium.googlesource.com/chromium/src.git@master