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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2004 Google Inc. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "talk/media/devices/linuxdevicemanager.h" | |
| 29 | |
| 30 #include <unistd.h> | |
| 31 #include "talk/media/base/mediacommon.h" | |
| 32 #include "talk/media/devices/libudevsymboltable.h" | |
| 33 #include "talk/media/devices/v4llookup.h" | |
| 34 #include "webrtc/sound/platformsoundsystem.h" | |
| 35 #include "webrtc/sound/platformsoundsystemfactory.h" | |
| 36 #include "webrtc/sound/sounddevicelocator.h" | |
| 37 #include "webrtc/sound/soundsysteminterface.h" | |
| 38 #include "webrtc/base/fileutils.h" | |
| 39 #include "webrtc/base/linux.h" | |
| 40 #include "webrtc/base/logging.h" | |
| 41 #include "webrtc/base/pathutils.h" | |
| 42 #include "webrtc/base/physicalsocketserver.h" | |
| 43 #include "webrtc/base/stream.h" | |
| 44 #include "webrtc/base/stringutils.h" | |
| 45 #include "webrtc/base/thread.h" | |
| 46 | |
| 47 namespace cricket { | |
| 48 | |
| 49 DeviceManagerInterface* DeviceManagerFactory::Create() { | |
| 50 return new LinuxDeviceManager(); | |
| 51 } | |
| 52 | |
| 53 class LinuxDeviceWatcher | |
| 54 : public DeviceWatcher, | |
| 55 private rtc::Dispatcher { | |
| 56 public: | |
| 57 explicit LinuxDeviceWatcher(DeviceManagerInterface* dm); | |
| 58 virtual ~LinuxDeviceWatcher(); | |
| 59 virtual bool Start(); | |
| 60 virtual void Stop(); | |
| 61 | |
| 62 private: | |
| 63 virtual uint32_t GetRequestedEvents(); | |
| 64 virtual void OnPreEvent(uint32_t ff); | |
| 65 virtual void OnEvent(uint32_t ff, int err); | |
| 66 virtual int GetDescriptor(); | |
| 67 virtual bool IsDescriptorClosed(); | |
| 68 | |
| 69 DeviceManagerInterface* manager_; | |
| 70 LibUDevSymbolTable libudev_; | |
| 71 struct udev* udev_; | |
| 72 struct udev_monitor* udev_monitor_; | |
| 73 bool registered_; | |
| 74 }; | |
| 75 | |
| 76 static const char* const kFilteredAudioDevicesName[] = { | |
| 77 #if defined(CHROMEOS) | |
| 78 "surround40:", | |
| 79 "surround41:", | |
| 80 "surround50:", | |
| 81 "surround51:", | |
| 82 "surround71:", | |
| 83 "iec958:", // S/PDIF | |
| 84 #endif | |
| 85 NULL, | |
| 86 }; | |
| 87 static const char* kFilteredVideoDevicesName[] = { | |
| 88 NULL, | |
| 89 }; | |
| 90 | |
| 91 LinuxDeviceManager::LinuxDeviceManager() | |
| 92 : sound_system_(new rtc::PlatformSoundSystemFactory()) { | |
| 93 set_watcher(new LinuxDeviceWatcher(this)); | |
| 94 } | |
| 95 | |
| 96 LinuxDeviceManager::~LinuxDeviceManager() { | |
| 97 } | |
| 98 | |
| 99 bool LinuxDeviceManager::GetAudioDevices(bool input, | |
| 100 std::vector<Device>* devs) { | |
| 101 devs->clear(); | |
| 102 if (!sound_system_.get()) { | |
| 103 return false; | |
| 104 } | |
| 105 rtc::SoundSystemInterface::SoundDeviceLocatorList list; | |
| 106 bool success; | |
| 107 if (input) { | |
| 108 success = sound_system_->EnumerateCaptureDevices(&list); | |
| 109 } else { | |
| 110 success = sound_system_->EnumeratePlaybackDevices(&list); | |
| 111 } | |
| 112 if (!success) { | |
| 113 LOG(LS_ERROR) << "Can't enumerate devices"; | |
| 114 sound_system_.release(); | |
| 115 return false; | |
| 116 } | |
| 117 // We have to start the index at 1 because webrtc VoiceEngine puts the default | |
| 118 // device at index 0, but Enumerate(Capture|Playback)Devices does not include | |
| 119 // a locator for the default device. | |
| 120 int index = 1; | |
| 121 for (rtc::SoundSystemInterface::SoundDeviceLocatorList::iterator i = list.begi
n(); | |
| 122 i != list.end(); | |
| 123 ++i, ++index) { | |
| 124 devs->push_back(Device((*i)->name(), index)); | |
| 125 } | |
| 126 rtc::SoundSystemInterface::ClearSoundDeviceLocatorList(&list); | |
| 127 sound_system_.release(); | |
| 128 return FilterDevices(devs, kFilteredAudioDevicesName); | |
| 129 } | |
| 130 | |
| 131 static const std::string kVideoMetaPathK2_4("/proc/video/dev/"); | |
| 132 static const std::string kVideoMetaPathK2_6("/sys/class/video4linux/"); | |
| 133 | |
| 134 enum MetaType { M2_4, M2_6, NONE }; | |
| 135 | |
| 136 static void ScanDeviceDirectory(const std::string& devdir, | |
| 137 std::vector<Device>* devices) { | |
| 138 rtc::scoped_ptr<rtc::DirectoryIterator> directoryIterator( | |
| 139 rtc::Filesystem::IterateDirectory()); | |
| 140 | |
| 141 if (directoryIterator->Iterate(rtc::Pathname(devdir))) { | |
| 142 do { | |
| 143 std::string filename = directoryIterator->Name(); | |
| 144 std::string device_name = devdir + filename; | |
| 145 if (!directoryIterator->IsDots()) { | |
| 146 if (filename.find("video") == 0 && | |
| 147 V4LLookup::IsV4L2Device(device_name)) { | |
| 148 devices->push_back(Device(device_name, device_name)); | |
| 149 } | |
| 150 } | |
| 151 } while (directoryIterator->Next()); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 static std::string GetVideoDeviceNameK2_6(const std::string& device_meta_path) { | |
| 156 std::string device_name; | |
| 157 | |
| 158 rtc::scoped_ptr<rtc::FileStream> device_meta_stream( | |
| 159 rtc::Filesystem::OpenFile(device_meta_path, "r")); | |
| 160 | |
| 161 if (device_meta_stream) { | |
| 162 if (device_meta_stream->ReadLine(&device_name) != rtc::SR_SUCCESS) { | |
| 163 LOG(LS_ERROR) << "Failed to read V4L2 device meta " << device_meta_path; | |
| 164 } | |
| 165 device_meta_stream->Close(); | |
| 166 } | |
| 167 | |
| 168 return device_name; | |
| 169 } | |
| 170 | |
| 171 static std::string Trim(const std::string& s, const std::string& drop = " \t") { | |
| 172 std::string::size_type first = s.find_first_not_of(drop); | |
| 173 std::string::size_type last = s.find_last_not_of(drop); | |
| 174 | |
| 175 if (first == std::string::npos || last == std::string::npos) | |
| 176 return std::string(""); | |
| 177 | |
| 178 return s.substr(first, last - first + 1); | |
| 179 } | |
| 180 | |
| 181 static std::string GetVideoDeviceNameK2_4(const std::string& device_meta_path) { | |
| 182 rtc::ConfigParser::MapVector all_values; | |
| 183 | |
| 184 rtc::ConfigParser config_parser; | |
| 185 rtc::FileStream* file_stream = | |
| 186 rtc::Filesystem::OpenFile(device_meta_path, "r"); | |
| 187 | |
| 188 if (file_stream == NULL) return ""; | |
| 189 | |
| 190 config_parser.Attach(file_stream); | |
| 191 config_parser.Parse(&all_values); | |
| 192 | |
| 193 for (rtc::ConfigParser::MapVector::iterator i = all_values.begin(); | |
| 194 i != all_values.end(); ++i) { | |
| 195 rtc::ConfigParser::SimpleMap::iterator device_name_i = | |
| 196 i->find("name"); | |
| 197 | |
| 198 if (device_name_i != i->end()) { | |
| 199 return device_name_i->second; | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 return ""; | |
| 204 } | |
| 205 | |
| 206 static std::string GetVideoDeviceName(MetaType meta, | |
| 207 const std::string& device_file_name) { | |
| 208 std::string device_meta_path; | |
| 209 std::string device_name; | |
| 210 std::string meta_file_path; | |
| 211 | |
| 212 if (meta == M2_6) { | |
| 213 meta_file_path = kVideoMetaPathK2_6 + device_file_name + "/name"; | |
| 214 | |
| 215 LOG(LS_INFO) << "Trying " + meta_file_path; | |
| 216 device_name = GetVideoDeviceNameK2_6(meta_file_path); | |
| 217 | |
| 218 if (device_name.empty()) { | |
| 219 meta_file_path = kVideoMetaPathK2_6 + device_file_name + "/model"; | |
| 220 | |
| 221 LOG(LS_INFO) << "Trying " << meta_file_path; | |
| 222 device_name = GetVideoDeviceNameK2_6(meta_file_path); | |
| 223 } | |
| 224 } else { | |
| 225 meta_file_path = kVideoMetaPathK2_4 + device_file_name; | |
| 226 LOG(LS_INFO) << "Trying " << meta_file_path; | |
| 227 device_name = GetVideoDeviceNameK2_4(meta_file_path); | |
| 228 } | |
| 229 | |
| 230 if (device_name.empty()) { | |
| 231 device_name = "/dev/" + device_file_name; | |
| 232 LOG(LS_ERROR) | |
| 233 << "Device name not found, defaulting to device path " << device_name; | |
| 234 } | |
| 235 | |
| 236 LOG(LS_INFO) << "Name for " << device_file_name << " is " << device_name; | |
| 237 | |
| 238 return Trim(device_name); | |
| 239 } | |
| 240 | |
| 241 static void ScanV4L2Devices(std::vector<Device>* devices) { | |
| 242 LOG(LS_INFO) << ("Enumerating V4L2 devices"); | |
| 243 | |
| 244 MetaType meta; | |
| 245 std::string metadata_dir; | |
| 246 | |
| 247 rtc::scoped_ptr<rtc::DirectoryIterator> directoryIterator( | |
| 248 rtc::Filesystem::IterateDirectory()); | |
| 249 | |
| 250 // Try and guess kernel version | |
| 251 if (directoryIterator->Iterate(kVideoMetaPathK2_6)) { | |
| 252 meta = M2_6; | |
| 253 metadata_dir = kVideoMetaPathK2_6; | |
| 254 } else if (directoryIterator->Iterate(kVideoMetaPathK2_4)) { | |
| 255 meta = M2_4; | |
| 256 metadata_dir = kVideoMetaPathK2_4; | |
| 257 } else { | |
| 258 meta = NONE; | |
| 259 } | |
| 260 | |
| 261 if (meta != NONE) { | |
| 262 LOG(LS_INFO) << "V4L2 device metadata found at " << metadata_dir; | |
| 263 | |
| 264 do { | |
| 265 std::string filename = directoryIterator->Name(); | |
| 266 | |
| 267 if (filename.find("video") == 0) { | |
| 268 std::string device_path = "/dev/" + filename; | |
| 269 | |
| 270 if (V4LLookup::IsV4L2Device(device_path)) { | |
| 271 devices->push_back( | |
| 272 Device(GetVideoDeviceName(meta, filename), device_path)); | |
| 273 } | |
| 274 } | |
| 275 } while (directoryIterator->Next()); | |
| 276 } else { | |
| 277 LOG(LS_ERROR) << "Unable to detect v4l2 metadata directory"; | |
| 278 } | |
| 279 | |
| 280 if (devices->size() == 0) { | |
| 281 LOG(LS_INFO) << "Plan B. Scanning all video devices in /dev directory"; | |
| 282 ScanDeviceDirectory("/dev/", devices); | |
| 283 } | |
| 284 | |
| 285 LOG(LS_INFO) << "Total V4L2 devices found : " << devices->size(); | |
| 286 } | |
| 287 | |
| 288 bool LinuxDeviceManager::GetVideoCaptureDevices(std::vector<Device>* devices) { | |
| 289 devices->clear(); | |
| 290 ScanV4L2Devices(devices); | |
| 291 return FilterDevices(devices, kFilteredVideoDevicesName); | |
| 292 } | |
| 293 | |
| 294 LinuxDeviceWatcher::LinuxDeviceWatcher(DeviceManagerInterface* dm) | |
| 295 : DeviceWatcher(dm), | |
| 296 manager_(dm), | |
| 297 udev_(NULL), | |
| 298 udev_monitor_(NULL), | |
| 299 registered_(false) { | |
| 300 } | |
| 301 | |
| 302 LinuxDeviceWatcher::~LinuxDeviceWatcher() { | |
| 303 } | |
| 304 | |
| 305 static rtc::PhysicalSocketServer* CurrentSocketServer() { | |
| 306 rtc::SocketServer* ss = | |
| 307 rtc::ThreadManager::Instance()->WrapCurrentThread()->socketserver(); | |
| 308 return reinterpret_cast<rtc::PhysicalSocketServer*>(ss); | |
| 309 } | |
| 310 | |
| 311 bool LinuxDeviceWatcher::Start() { | |
| 312 // We deliberately return true in the failure paths here because libudev is | |
| 313 // not a critical component of a Linux system so it may not be present/usable, | |
| 314 // and we don't want to halt LinuxDeviceManager initialization in such a case. | |
| 315 if (!libudev_.Load() || IsWrongLibUDevAbiVersion(libudev_.GetDllHandle())) { | |
| 316 LOG(LS_WARNING) | |
| 317 << "libudev not present/usable; LinuxDeviceWatcher disabled"; | |
| 318 return true; | |
| 319 } | |
| 320 udev_ = libudev_.udev_new()(); | |
| 321 if (!udev_) { | |
| 322 LOG_ERR(LS_ERROR) << "udev_new()"; | |
| 323 return true; | |
| 324 } | |
| 325 // The second argument here is the event source. It can be either "kernel" or | |
| 326 // "udev", but "udev" is the only correct choice. Apps listen on udev and the | |
| 327 // udev daemon in turn listens on the kernel. | |
| 328 udev_monitor_ = libudev_.udev_monitor_new_from_netlink()(udev_, "udev"); | |
| 329 if (!udev_monitor_) { | |
| 330 LOG_ERR(LS_ERROR) << "udev_monitor_new_from_netlink()"; | |
| 331 return true; | |
| 332 } | |
| 333 // We only listen for changes in the video devices. Audio devices are more or | |
| 334 // less unimportant because receiving device change notifications really only | |
| 335 // matters for broadcasting updated send/recv capabilities based on whether | |
| 336 // there is at least one device available, and almost all computers have at | |
| 337 // least one audio device. Also, PulseAudio device notifications don't come | |
| 338 // from the udev daemon, they come from the PulseAudio daemon, so we'd only | |
| 339 // want to listen for audio device changes from udev if using ALSA. For | |
| 340 // simplicity, we don't bother with any audio stuff at all. | |
| 341 if (libudev_.udev_monitor_filter_add_match_subsystem_devtype()( | |
| 342 udev_monitor_, "video4linux", NULL) < 0) { | |
| 343 LOG_ERR(LS_ERROR) << "udev_monitor_filter_add_match_subsystem_devtype()"; | |
| 344 return true; | |
| 345 } | |
| 346 if (libudev_.udev_monitor_enable_receiving()(udev_monitor_) < 0) { | |
| 347 LOG_ERR(LS_ERROR) << "udev_monitor_enable_receiving()"; | |
| 348 return true; | |
| 349 } | |
| 350 CurrentSocketServer()->Add(this); | |
| 351 registered_ = true; | |
| 352 return true; | |
| 353 } | |
| 354 | |
| 355 void LinuxDeviceWatcher::Stop() { | |
| 356 if (registered_) { | |
| 357 CurrentSocketServer()->Remove(this); | |
| 358 registered_ = false; | |
| 359 } | |
| 360 if (udev_monitor_) { | |
| 361 libudev_.udev_monitor_unref()(udev_monitor_); | |
| 362 udev_monitor_ = NULL; | |
| 363 } | |
| 364 if (udev_) { | |
| 365 libudev_.udev_unref()(udev_); | |
| 366 udev_ = NULL; | |
| 367 } | |
| 368 libudev_.Unload(); | |
| 369 } | |
| 370 | |
| 371 uint32_t LinuxDeviceWatcher::GetRequestedEvents() { | |
| 372 return rtc::DE_READ; | |
| 373 } | |
| 374 | |
| 375 void LinuxDeviceWatcher::OnPreEvent(uint32_t ff) { | |
| 376 // Nothing to do. | |
| 377 } | |
| 378 | |
| 379 void LinuxDeviceWatcher::OnEvent(uint32_t ff, int err) { | |
| 380 udev_device* device = libudev_.udev_monitor_receive_device()(udev_monitor_); | |
| 381 if (!device) { | |
| 382 // Probably the socket connection to the udev daemon was terminated (perhaps | |
| 383 // the daemon crashed or is being restarted?). | |
| 384 LOG_ERR(LS_WARNING) << "udev_monitor_receive_device()"; | |
| 385 // Stop listening to avoid potential livelock (an fd with EOF in it is | |
| 386 // always considered readable). | |
| 387 CurrentSocketServer()->Remove(this); | |
| 388 registered_ = false; | |
| 389 return; | |
| 390 } | |
| 391 // Else we read the device successfully. | |
| 392 | |
| 393 // Since we already have our own filesystem-based device enumeration code, we | |
| 394 // simply re-enumerate rather than inspecting the device event. | |
| 395 libudev_.udev_device_unref()(device); | |
| 396 manager_->SignalDevicesChange(); | |
| 397 } | |
| 398 | |
| 399 int LinuxDeviceWatcher::GetDescriptor() { | |
| 400 return libudev_.udev_monitor_get_fd()(udev_monitor_); | |
| 401 } | |
| 402 | |
| 403 bool LinuxDeviceWatcher::IsDescriptorClosed() { | |
| 404 // If it is closed then we will just get an error in | |
| 405 // udev_monitor_receive_device and unregister, so we don't need to check for | |
| 406 // it separately. | |
| 407 return false; | |
| 408 } | |
| 409 | |
| 410 }; // namespace cricket | |
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Chromium Code Reviews
Issue 1587193006:
Move talk/media to webrtc/media (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master