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Unified Diff: talk/media/devices/linuxdevicemanager.cc

Issue 1587193006: Move talk/media to webrtc/media (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: Rebased to b647aca12a884a13c1728118586245399b55fa3d (#11493) Created 4 years, 10 months ago
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Index: talk/media/devices/linuxdevicemanager.cc
diff --git a/talk/media/devices/linuxdevicemanager.cc b/talk/media/devices/linuxdevicemanager.cc
deleted file mode 100644
index 25be321c5e580b60019089e37af631c977ac6baf..0000000000000000000000000000000000000000
--- a/talk/media/devices/linuxdevicemanager.cc
+++ /dev/null
@@ -1,410 +0,0 @@
-/*
- * libjingle
- * Copyright 2004 Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "talk/media/devices/linuxdevicemanager.h"
-
-#include <unistd.h>
-#include "talk/media/base/mediacommon.h"
-#include "talk/media/devices/libudevsymboltable.h"
-#include "talk/media/devices/v4llookup.h"
-#include "webrtc/sound/platformsoundsystem.h"
-#include "webrtc/sound/platformsoundsystemfactory.h"
-#include "webrtc/sound/sounddevicelocator.h"
-#include "webrtc/sound/soundsysteminterface.h"
-#include "webrtc/base/fileutils.h"
-#include "webrtc/base/linux.h"
-#include "webrtc/base/logging.h"
-#include "webrtc/base/pathutils.h"
-#include "webrtc/base/physicalsocketserver.h"
-#include "webrtc/base/stream.h"
-#include "webrtc/base/stringutils.h"
-#include "webrtc/base/thread.h"
-
-namespace cricket {
-
-DeviceManagerInterface* DeviceManagerFactory::Create() {
- return new LinuxDeviceManager();
-}
-
-class LinuxDeviceWatcher
- : public DeviceWatcher,
- private rtc::Dispatcher {
- public:
- explicit LinuxDeviceWatcher(DeviceManagerInterface* dm);
- virtual ~LinuxDeviceWatcher();
- virtual bool Start();
- virtual void Stop();
-
- private:
- virtual uint32_t GetRequestedEvents();
- virtual void OnPreEvent(uint32_t ff);
- virtual void OnEvent(uint32_t ff, int err);
- virtual int GetDescriptor();
- virtual bool IsDescriptorClosed();
-
- DeviceManagerInterface* manager_;
- LibUDevSymbolTable libudev_;
- struct udev* udev_;
- struct udev_monitor* udev_monitor_;
- bool registered_;
-};
-
-static const char* const kFilteredAudioDevicesName[] = {
-#if defined(CHROMEOS)
- "surround40:",
- "surround41:",
- "surround50:",
- "surround51:",
- "surround71:",
- "iec958:", // S/PDIF
-#endif
- NULL,
-};
-static const char* kFilteredVideoDevicesName[] = {
- NULL,
-};
-
-LinuxDeviceManager::LinuxDeviceManager()
- : sound_system_(new rtc::PlatformSoundSystemFactory()) {
- set_watcher(new LinuxDeviceWatcher(this));
-}
-
-LinuxDeviceManager::~LinuxDeviceManager() {
-}
-
-bool LinuxDeviceManager::GetAudioDevices(bool input,
- std::vector<Device>* devs) {
- devs->clear();
- if (!sound_system_.get()) {
- return false;
- }
- rtc::SoundSystemInterface::SoundDeviceLocatorList list;
- bool success;
- if (input) {
- success = sound_system_->EnumerateCaptureDevices(&list);
- } else {
- success = sound_system_->EnumeratePlaybackDevices(&list);
- }
- if (!success) {
- LOG(LS_ERROR) << "Can't enumerate devices";
- sound_system_.release();
- return false;
- }
- // We have to start the index at 1 because webrtc VoiceEngine puts the default
- // device at index 0, but Enumerate(Capture|Playback)Devices does not include
- // a locator for the default device.
- int index = 1;
- for (rtc::SoundSystemInterface::SoundDeviceLocatorList::iterator i = list.begin();
- i != list.end();
- ++i, ++index) {
- devs->push_back(Device((*i)->name(), index));
- }
- rtc::SoundSystemInterface::ClearSoundDeviceLocatorList(&list);
- sound_system_.release();
- return FilterDevices(devs, kFilteredAudioDevicesName);
-}
-
-static const std::string kVideoMetaPathK2_4("/proc/video/dev/");
-static const std::string kVideoMetaPathK2_6("/sys/class/video4linux/");
-
-enum MetaType { M2_4, M2_6, NONE };
-
-static void ScanDeviceDirectory(const std::string& devdir,
- std::vector<Device>* devices) {
- rtc::scoped_ptr<rtc::DirectoryIterator> directoryIterator(
- rtc::Filesystem::IterateDirectory());
-
- if (directoryIterator->Iterate(rtc::Pathname(devdir))) {
- do {
- std::string filename = directoryIterator->Name();
- std::string device_name = devdir + filename;
- if (!directoryIterator->IsDots()) {
- if (filename.find("video") == 0 &&
- V4LLookup::IsV4L2Device(device_name)) {
- devices->push_back(Device(device_name, device_name));
- }
- }
- } while (directoryIterator->Next());
- }
-}
-
-static std::string GetVideoDeviceNameK2_6(const std::string& device_meta_path) {
- std::string device_name;
-
- rtc::scoped_ptr<rtc::FileStream> device_meta_stream(
- rtc::Filesystem::OpenFile(device_meta_path, "r"));
-
- if (device_meta_stream) {
- if (device_meta_stream->ReadLine(&device_name) != rtc::SR_SUCCESS) {
- LOG(LS_ERROR) << "Failed to read V4L2 device meta " << device_meta_path;
- }
- device_meta_stream->Close();
- }
-
- return device_name;
-}
-
-static std::string Trim(const std::string& s, const std::string& drop = " \t") {
- std::string::size_type first = s.find_first_not_of(drop);
- std::string::size_type last = s.find_last_not_of(drop);
-
- if (first == std::string::npos || last == std::string::npos)
- return std::string("");
-
- return s.substr(first, last - first + 1);
-}
-
-static std::string GetVideoDeviceNameK2_4(const std::string& device_meta_path) {
- rtc::ConfigParser::MapVector all_values;
-
- rtc::ConfigParser config_parser;
- rtc::FileStream* file_stream =
- rtc::Filesystem::OpenFile(device_meta_path, "r");
-
- if (file_stream == NULL) return "";
-
- config_parser.Attach(file_stream);
- config_parser.Parse(&all_values);
-
- for (rtc::ConfigParser::MapVector::iterator i = all_values.begin();
- i != all_values.end(); ++i) {
- rtc::ConfigParser::SimpleMap::iterator device_name_i =
- i->find("name");
-
- if (device_name_i != i->end()) {
- return device_name_i->second;
- }
- }
-
- return "";
-}
-
-static std::string GetVideoDeviceName(MetaType meta,
- const std::string& device_file_name) {
- std::string device_meta_path;
- std::string device_name;
- std::string meta_file_path;
-
- if (meta == M2_6) {
- meta_file_path = kVideoMetaPathK2_6 + device_file_name + "/name";
-
- LOG(LS_INFO) << "Trying " + meta_file_path;
- device_name = GetVideoDeviceNameK2_6(meta_file_path);
-
- if (device_name.empty()) {
- meta_file_path = kVideoMetaPathK2_6 + device_file_name + "/model";
-
- LOG(LS_INFO) << "Trying " << meta_file_path;
- device_name = GetVideoDeviceNameK2_6(meta_file_path);
- }
- } else {
- meta_file_path = kVideoMetaPathK2_4 + device_file_name;
- LOG(LS_INFO) << "Trying " << meta_file_path;
- device_name = GetVideoDeviceNameK2_4(meta_file_path);
- }
-
- if (device_name.empty()) {
- device_name = "/dev/" + device_file_name;
- LOG(LS_ERROR)
- << "Device name not found, defaulting to device path " << device_name;
- }
-
- LOG(LS_INFO) << "Name for " << device_file_name << " is " << device_name;
-
- return Trim(device_name);
-}
-
-static void ScanV4L2Devices(std::vector<Device>* devices) {
- LOG(LS_INFO) << ("Enumerating V4L2 devices");
-
- MetaType meta;
- std::string metadata_dir;
-
- rtc::scoped_ptr<rtc::DirectoryIterator> directoryIterator(
- rtc::Filesystem::IterateDirectory());
-
- // Try and guess kernel version
- if (directoryIterator->Iterate(kVideoMetaPathK2_6)) {
- meta = M2_6;
- metadata_dir = kVideoMetaPathK2_6;
- } else if (directoryIterator->Iterate(kVideoMetaPathK2_4)) {
- meta = M2_4;
- metadata_dir = kVideoMetaPathK2_4;
- } else {
- meta = NONE;
- }
-
- if (meta != NONE) {
- LOG(LS_INFO) << "V4L2 device metadata found at " << metadata_dir;
-
- do {
- std::string filename = directoryIterator->Name();
-
- if (filename.find("video") == 0) {
- std::string device_path = "/dev/" + filename;
-
- if (V4LLookup::IsV4L2Device(device_path)) {
- devices->push_back(
- Device(GetVideoDeviceName(meta, filename), device_path));
- }
- }
- } while (directoryIterator->Next());
- } else {
- LOG(LS_ERROR) << "Unable to detect v4l2 metadata directory";
- }
-
- if (devices->size() == 0) {
- LOG(LS_INFO) << "Plan B. Scanning all video devices in /dev directory";
- ScanDeviceDirectory("/dev/", devices);
- }
-
- LOG(LS_INFO) << "Total V4L2 devices found : " << devices->size();
-}
-
-bool LinuxDeviceManager::GetVideoCaptureDevices(std::vector<Device>* devices) {
- devices->clear();
- ScanV4L2Devices(devices);
- return FilterDevices(devices, kFilteredVideoDevicesName);
-}
-
-LinuxDeviceWatcher::LinuxDeviceWatcher(DeviceManagerInterface* dm)
- : DeviceWatcher(dm),
- manager_(dm),
- udev_(NULL),
- udev_monitor_(NULL),
- registered_(false) {
-}
-
-LinuxDeviceWatcher::~LinuxDeviceWatcher() {
-}
-
-static rtc::PhysicalSocketServer* CurrentSocketServer() {
- rtc::SocketServer* ss =
- rtc::ThreadManager::Instance()->WrapCurrentThread()->socketserver();
- return reinterpret_cast<rtc::PhysicalSocketServer*>(ss);
-}
-
-bool LinuxDeviceWatcher::Start() {
- // We deliberately return true in the failure paths here because libudev is
- // not a critical component of a Linux system so it may not be present/usable,
- // and we don't want to halt LinuxDeviceManager initialization in such a case.
- if (!libudev_.Load() || IsWrongLibUDevAbiVersion(libudev_.GetDllHandle())) {
- LOG(LS_WARNING)
- << "libudev not present/usable; LinuxDeviceWatcher disabled";
- return true;
- }
- udev_ = libudev_.udev_new()();
- if (!udev_) {
- LOG_ERR(LS_ERROR) << "udev_new()";
- return true;
- }
- // The second argument here is the event source. It can be either "kernel" or
- // "udev", but "udev" is the only correct choice. Apps listen on udev and the
- // udev daemon in turn listens on the kernel.
- udev_monitor_ = libudev_.udev_monitor_new_from_netlink()(udev_, "udev");
- if (!udev_monitor_) {
- LOG_ERR(LS_ERROR) << "udev_monitor_new_from_netlink()";
- return true;
- }
- // We only listen for changes in the video devices. Audio devices are more or
- // less unimportant because receiving device change notifications really only
- // matters for broadcasting updated send/recv capabilities based on whether
- // there is at least one device available, and almost all computers have at
- // least one audio device. Also, PulseAudio device notifications don't come
- // from the udev daemon, they come from the PulseAudio daemon, so we'd only
- // want to listen for audio device changes from udev if using ALSA. For
- // simplicity, we don't bother with any audio stuff at all.
- if (libudev_.udev_monitor_filter_add_match_subsystem_devtype()(
- udev_monitor_, "video4linux", NULL) < 0) {
- LOG_ERR(LS_ERROR) << "udev_monitor_filter_add_match_subsystem_devtype()";
- return true;
- }
- if (libudev_.udev_monitor_enable_receiving()(udev_monitor_) < 0) {
- LOG_ERR(LS_ERROR) << "udev_monitor_enable_receiving()";
- return true;
- }
- CurrentSocketServer()->Add(this);
- registered_ = true;
- return true;
-}
-
-void LinuxDeviceWatcher::Stop() {
- if (registered_) {
- CurrentSocketServer()->Remove(this);
- registered_ = false;
- }
- if (udev_monitor_) {
- libudev_.udev_monitor_unref()(udev_monitor_);
- udev_monitor_ = NULL;
- }
- if (udev_) {
- libudev_.udev_unref()(udev_);
- udev_ = NULL;
- }
- libudev_.Unload();
-}
-
-uint32_t LinuxDeviceWatcher::GetRequestedEvents() {
- return rtc::DE_READ;
-}
-
-void LinuxDeviceWatcher::OnPreEvent(uint32_t ff) {
- // Nothing to do.
-}
-
-void LinuxDeviceWatcher::OnEvent(uint32_t ff, int err) {
- udev_device* device = libudev_.udev_monitor_receive_device()(udev_monitor_);
- if (!device) {
- // Probably the socket connection to the udev daemon was terminated (perhaps
- // the daemon crashed or is being restarted?).
- LOG_ERR(LS_WARNING) << "udev_monitor_receive_device()";
- // Stop listening to avoid potential livelock (an fd with EOF in it is
- // always considered readable).
- CurrentSocketServer()->Remove(this);
- registered_ = false;
- return;
- }
- // Else we read the device successfully.
-
- // Since we already have our own filesystem-based device enumeration code, we
- // simply re-enumerate rather than inspecting the device event.
- libudev_.udev_device_unref()(device);
- manager_->SignalDevicesChange();
-}
-
-int LinuxDeviceWatcher::GetDescriptor() {
- return libudev_.udev_monitor_get_fd()(udev_monitor_);
-}
-
-bool LinuxDeviceWatcher::IsDescriptorClosed() {
- // If it is closed then we will just get an error in
- // udev_monitor_receive_device and unregister, so we don't need to check for
- // it separately.
- return false;
-}
-
-}; // namespace cricket
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