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| 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 #include "remoting/host/video_scheduler.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/callback.h" | |
| 11 #include "base/logging.h" | |
| 12 #include "base/memory/scoped_ptr.h" | |
| 13 #include "base/message_loop/message_loop_proxy.h" | |
| 14 #include "base/task_runner_util.h" | |
| 15 #include "base/time/time.h" | |
| 16 #include "remoting/host/capture_scheduler.h" | |
| 17 #include "remoting/proto/control.pb.h" | |
| 18 #include "remoting/proto/internal.pb.h" | |
| 19 #include "remoting/proto/video.pb.h" | |
| 20 #include "remoting/protocol/cursor_shape_stub.h" | |
| 21 #include "remoting/protocol/video_stub.h" | |
| 22 #include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h" | |
| 23 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h" | |
| 24 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h" | |
| 25 | |
| 26 namespace remoting { | |
| 27 | |
| 28 namespace { | |
| 29 | |
| 30 // Helper used to encode frames on the encode thread. | |
| 31 // | |
| 32 // TODO(sergeyu): This functions doesn't do much beside calling | |
| 33 // VideoEncoder::Encode(). It's only needed to handle empty frames properly and | |
| 34 // that logic can be moved to VideoEncoder implementations. | |
| 35 scoped_ptr<VideoPacket> EncodeFrame(VideoEncoder* encoder, | |
| 36 scoped_ptr<webrtc::DesktopFrame> frame) { | |
| 37 // If there is nothing to encode then send an empty packet. | |
| 38 if (!frame || frame->updated_region().is_empty()) | |
| 39 return make_scoped_ptr(new VideoPacket()); | |
| 40 | |
| 41 return encoder->Encode(*frame); | |
| 42 } | |
| 43 | |
| 44 } // namespace | |
| 45 | |
| 46 // Interval between empty keep-alive frames. These frames are sent only when the | |
| 47 // stream is paused or inactive for some other reason (e.g. when blocked on | |
| 48 // capturer). To prevent PseudoTCP from resetting congestion window this value | |
| 49 // must be smaller than the minimum RTO used in PseudoTCP, which is 250ms. | |
| 50 static const int kKeepAlivePacketIntervalMs = 200; | |
| 51 | |
| 52 static bool g_enable_timestamps = false; | |
| 53 | |
| 54 // static | |
| 55 void VideoScheduler::EnableTimestampsForTests() { | |
| 56 g_enable_timestamps = true; | |
| 57 } | |
| 58 | |
| 59 VideoScheduler::VideoScheduler( | |
| 60 scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner, | |
| 61 scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner, | |
| 62 scoped_refptr<base::SingleThreadTaskRunner> network_task_runner, | |
| 63 scoped_ptr<webrtc::DesktopCapturer> capturer, | |
| 64 scoped_ptr<webrtc::MouseCursorMonitor> mouse_cursor_monitor, | |
| 65 scoped_ptr<VideoEncoder> encoder, | |
| 66 protocol::CursorShapeStub* cursor_stub, | |
| 67 protocol::VideoStub* video_stub) | |
| 68 : capture_task_runner_(capture_task_runner), | |
| 69 encode_task_runner_(encode_task_runner), | |
| 70 network_task_runner_(network_task_runner), | |
| 71 capturer_(capturer.Pass()), | |
| 72 mouse_cursor_monitor_(mouse_cursor_monitor.Pass()), | |
| 73 encoder_(encoder.Pass()), | |
| 74 cursor_stub_(cursor_stub), | |
| 75 video_stub_(video_stub), | |
| 76 latest_event_timestamp_(0) { | |
| 77 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 78 DCHECK(capturer_); | |
| 79 DCHECK(mouse_cursor_monitor_); | |
| 80 DCHECK(encoder_); | |
| 81 DCHECK(cursor_stub_); | |
| 82 DCHECK(video_stub_); | |
| 83 } | |
| 84 | |
| 85 // Public methods -------------------------------------------------------------- | |
| 86 | |
| 87 void VideoScheduler::Start() { | |
| 88 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 89 | |
| 90 keep_alive_timer_.reset(new base::DelayTimer<VideoScheduler>( | |
| 91 FROM_HERE, base::TimeDelta::FromMilliseconds(kKeepAlivePacketIntervalMs), | |
| 92 this, &VideoScheduler::SendKeepAlivePacket)); | |
| 93 | |
| 94 capture_scheduler_.reset(new CaptureScheduler( | |
| 95 base::Bind(&VideoScheduler::CaptureNextFrame, this))); | |
| 96 capture_scheduler_->Start(); | |
| 97 | |
| 98 capture_task_runner_->PostTask( | |
| 99 FROM_HERE, base::Bind(&VideoScheduler::StartOnCaptureThread, this)); | |
| 100 } | |
| 101 | |
| 102 void VideoScheduler::Stop() { | |
| 103 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 104 | |
| 105 // Clear stubs to prevent further updates reaching the client. | |
| 106 cursor_stub_ = nullptr; | |
| 107 video_stub_ = nullptr; | |
| 108 | |
| 109 capture_scheduler_.reset(); | |
| 110 keep_alive_timer_.reset(); | |
| 111 | |
| 112 capture_task_runner_->PostTask( | |
| 113 FROM_HERE, base::Bind(&VideoScheduler::StopOnCaptureThread, this)); | |
| 114 } | |
| 115 | |
| 116 void VideoScheduler::Pause(bool pause) { | |
| 117 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 118 | |
| 119 capture_scheduler_->Pause(pause); | |
| 120 } | |
| 121 | |
| 122 void VideoScheduler::SetLatestEventTimestamp(int64 latest_event_timestamp) { | |
| 123 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 124 | |
| 125 latest_event_timestamp_ = latest_event_timestamp; | |
| 126 } | |
| 127 | |
| 128 void VideoScheduler::SetLosslessEncode(bool want_lossless) { | |
| 129 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 130 | |
| 131 encode_task_runner_->PostTask( | |
| 132 FROM_HERE, base::Bind(&VideoEncoder::SetLosslessEncode, | |
| 133 base::Unretained(encoder_.get()), want_lossless)); | |
| 134 } | |
| 135 | |
| 136 void VideoScheduler::SetLosslessColor(bool want_lossless) { | |
| 137 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 138 | |
| 139 encode_task_runner_->PostTask( | |
| 140 FROM_HERE, base::Bind(&VideoEncoder::SetLosslessColor, | |
| 141 base::Unretained(encoder_.get()), want_lossless)); | |
| 142 } | |
| 143 | |
| 144 // Private methods ----------------------------------------------------------- | |
| 145 | |
| 146 VideoScheduler::~VideoScheduler() { | |
| 147 // Destroy the capturer and encoder on their respective threads. | |
| 148 capture_task_runner_->DeleteSoon(FROM_HERE, capturer_.release()); | |
| 149 capture_task_runner_->DeleteSoon(FROM_HERE, mouse_cursor_monitor_.release()); | |
| 150 encode_task_runner_->DeleteSoon(FROM_HERE, encoder_.release()); | |
| 151 } | |
| 152 | |
| 153 // Capturer thread ------------------------------------------------------------- | |
| 154 | |
| 155 webrtc::SharedMemory* VideoScheduler::CreateSharedMemory(size_t size) { | |
| 156 return nullptr; | |
| 157 } | |
| 158 | |
| 159 void VideoScheduler::OnCaptureCompleted(webrtc::DesktopFrame* frame) { | |
| 160 DCHECK(capture_task_runner_->BelongsToCurrentThread()); | |
| 161 | |
| 162 network_task_runner_->PostTask( | |
| 163 FROM_HERE, base::Bind(&VideoScheduler::EncodeAndSendFrame, this, | |
| 164 base::Passed(make_scoped_ptr(frame)))); | |
| 165 } | |
| 166 | |
| 167 void VideoScheduler::OnMouseCursor(webrtc::MouseCursor* cursor) { | |
| 168 DCHECK(capture_task_runner_->BelongsToCurrentThread()); | |
| 169 | |
| 170 scoped_ptr<webrtc::MouseCursor> owned_cursor(cursor); | |
| 171 | |
| 172 scoped_ptr<protocol::CursorShapeInfo> cursor_proto( | |
| 173 new protocol::CursorShapeInfo()); | |
| 174 cursor_proto->set_width(cursor->image()->size().width()); | |
| 175 cursor_proto->set_height(cursor->image()->size().height()); | |
| 176 cursor_proto->set_hotspot_x(cursor->hotspot().x()); | |
| 177 cursor_proto->set_hotspot_y(cursor->hotspot().y()); | |
| 178 | |
| 179 cursor_proto->set_data(std::string()); | |
| 180 uint8_t* current_row = cursor->image()->data(); | |
| 181 for (int y = 0; y < cursor->image()->size().height(); ++y) { | |
| 182 cursor_proto->mutable_data()->append( | |
| 183 current_row, | |
| 184 current_row + cursor->image()->size().width() * | |
| 185 webrtc::DesktopFrame::kBytesPerPixel); | |
| 186 current_row += cursor->image()->stride(); | |
| 187 } | |
| 188 | |
| 189 network_task_runner_->PostTask( | |
| 190 FROM_HERE, base::Bind(&VideoScheduler::SendCursorShape, this, | |
| 191 base::Passed(&cursor_proto))); | |
| 192 } | |
| 193 | |
| 194 void VideoScheduler::OnMouseCursorPosition( | |
| 195 webrtc::MouseCursorMonitor::CursorState state, | |
| 196 const webrtc::DesktopVector& position) { | |
| 197 // We're not subscribing to mouse position changes. | |
| 198 NOTREACHED(); | |
| 199 } | |
| 200 | |
| 201 void VideoScheduler::StartOnCaptureThread() { | |
| 202 DCHECK(capture_task_runner_->BelongsToCurrentThread()); | |
| 203 | |
| 204 mouse_cursor_monitor_->Init(this, webrtc::MouseCursorMonitor::SHAPE_ONLY); | |
| 205 capturer_->Start(this); | |
| 206 } | |
| 207 | |
| 208 void VideoScheduler::StopOnCaptureThread() { | |
| 209 DCHECK(capture_task_runner_->BelongsToCurrentThread()); | |
| 210 | |
| 211 // This doesn't deleted already captured frames, so encoder can keep using the | |
| 212 // frames that were captured previously. | |
| 213 capturer_.reset(); | |
| 214 | |
| 215 mouse_cursor_monitor_.reset(); | |
| 216 } | |
| 217 | |
| 218 void VideoScheduler::CaptureNextFrameOnCaptureThread() { | |
| 219 DCHECK(capture_task_runner_->BelongsToCurrentThread()); | |
| 220 | |
| 221 // Capture mouse shape first and then screen content. | |
| 222 mouse_cursor_monitor_->Capture(); | |
| 223 capturer_->Capture(webrtc::DesktopRegion()); | |
| 224 } | |
| 225 | |
| 226 // Network thread -------------------------------------------------------------- | |
| 227 | |
| 228 void VideoScheduler::CaptureNextFrame() { | |
| 229 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 230 | |
| 231 capture_task_runner_->PostTask( | |
| 232 FROM_HERE, | |
| 233 base::Bind(&VideoScheduler::CaptureNextFrameOnCaptureThread, this)); | |
| 234 } | |
| 235 | |
| 236 void VideoScheduler::EncodeAndSendFrame( | |
| 237 scoped_ptr<webrtc::DesktopFrame> frame) { | |
| 238 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 239 | |
| 240 if (!video_stub_) | |
| 241 return; | |
| 242 | |
| 243 capture_scheduler_->OnCaptureCompleted(); | |
| 244 | |
| 245 // Even when |frame| is nullptr we still need to post it to the encode thread | |
| 246 // to make sure frames are freed in the same order they are received and | |
| 247 // that we don't start capturing frame n+2 before frame n is freed. | |
| 248 base::PostTaskAndReplyWithResult( | |
| 249 encode_task_runner_.get(), FROM_HERE, | |
| 250 base::Bind(&EncodeFrame, encoder_.get(), base::Passed(&frame)), | |
| 251 base::Bind(&VideoScheduler::SendEncodedFrame, this, | |
| 252 latest_event_timestamp_, base::TimeTicks::Now())); | |
| 253 } | |
| 254 | |
| 255 void VideoScheduler::SendEncodedFrame(int64 latest_event_timestamp, | |
| 256 base::TimeTicks timestamp, | |
| 257 scoped_ptr<VideoPacket> packet) { | |
| 258 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 259 | |
| 260 if (!video_stub_) | |
| 261 return; | |
| 262 | |
| 263 if (g_enable_timestamps) | |
| 264 packet->set_timestamp(timestamp.ToInternalValue()); | |
| 265 | |
| 266 packet->set_latest_event_timestamp(latest_event_timestamp); | |
| 267 | |
| 268 capture_scheduler_->OnFrameEncoded( | |
| 269 base::TimeDelta::FromMilliseconds(packet->encode_time_ms())); | |
| 270 | |
| 271 video_stub_->ProcessVideoPacket( | |
| 272 packet.Pass(), base::Bind(&VideoScheduler::OnVideoPacketSent, this)); | |
| 273 } | |
| 274 | |
| 275 void VideoScheduler::OnVideoPacketSent() { | |
| 276 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 277 | |
| 278 if (!video_stub_) | |
| 279 return; | |
| 280 | |
| 281 capture_scheduler_->OnFrameSent(); | |
| 282 keep_alive_timer_->Reset(); | |
| 283 } | |
| 284 | |
| 285 void VideoScheduler::SendKeepAlivePacket() { | |
| 286 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 287 | |
| 288 video_stub_->ProcessVideoPacket( | |
| 289 make_scoped_ptr(new VideoPacket()), | |
| 290 base::Bind(&VideoScheduler::OnKeepAlivePacketSent, this)); | |
| 291 } | |
| 292 | |
| 293 void VideoScheduler::OnKeepAlivePacketSent() { | |
| 294 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 295 | |
| 296 if (keep_alive_timer_) | |
| 297 keep_alive_timer_->Reset(); | |
| 298 } | |
| 299 | |
| 300 void VideoScheduler::SendCursorShape( | |
| 301 scoped_ptr<protocol::CursorShapeInfo> cursor_shape) { | |
| 302 DCHECK(network_task_runner_->BelongsToCurrentThread()); | |
| 303 | |
| 304 if (!cursor_stub_) | |
| 305 return; | |
| 306 | |
| 307 cursor_stub_->SetCursorShape(*cursor_shape); | |
| 308 } | |
| 309 | |
| 310 } // namespace remoting | |
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Chromium Code Reviews
Issue 893353002:
Rename VideoScheduler->VideoFramePipe. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@scheduler_cleanup