| // Copyright 2016 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "media/midi/midi_service.h" |
| |
| #include "base/feature_list.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/task/single_thread_task_runner.h" |
| #include "build/build_config.h" |
| #include "media/midi/midi_manager.h" |
| #include "media/midi/midi_switches.h" |
| #include "media/midi/task_service.h" |
| |
| namespace midi { |
| |
| std::unique_ptr<MidiManager> MidiService::ManagerFactory::Create( |
| MidiService* service) { |
| return std::unique_ptr<MidiManager>(MidiManager::Create(service)); |
| } |
| |
| // static |
| base::TimeDelta MidiService::TimestampToTimeDeltaDelay( |
| base::TimeTicks timestamp) { |
| if (timestamp.is_null()) |
| return base::TimeDelta(); |
| return std::max(timestamp - base::TimeTicks::Now(), base::TimeDelta()); |
| } |
| |
| MidiService::MidiService() : MidiService(std::make_unique<ManagerFactory>()) {} |
| |
| MidiService::MidiService(std::unique_ptr<ManagerFactory> factory) |
| : manager_factory_(std::move(factory)), |
| task_service_(std::make_unique<TaskService>()) {} |
| |
| MidiService::~MidiService() { |
| base::AutoLock lock(lock_); |
| DCHECK(!manager_); |
| base::AutoLock threads_lock(threads_lock_); |
| threads_.clear(); |
| } |
| |
| void MidiService::Shutdown() { |
| base::AutoLock lock(lock_); |
| if (manager_) { |
| manager_->EndAllSessions(); |
| DCHECK(manager_destructor_runner_); |
| manager_destructor_runner_->DeleteSoon(FROM_HERE, std::move(manager_)); |
| manager_destructor_runner_ = nullptr; |
| } |
| } |
| |
| void MidiService::StartSession(MidiManagerClient* client) { |
| base::AutoLock lock(lock_); |
| if (!manager_) { |
| manager_ = manager_factory_->Create(this); |
| DCHECK(!manager_destructor_runner_); |
| manager_destructor_runner_ = |
| base::SingleThreadTaskRunner::GetCurrentDefault(); |
| } |
| manager_->StartSession(client); |
| } |
| |
| bool MidiService::EndSession(MidiManagerClient* client) { |
| base::AutoLock lock(lock_); |
| |
| // |client| does not seem to be valid. |
| if (!manager_ || !manager_->EndSession(client)) |
| return false; |
| |
| // Do not destruct MidiManager on macOS to avoid a Core MIDI issue that |
| // MIDIClientCreate starts failing with the OSStatus -50 after repeated calls |
| // of MIDIClientDispose. It rarely happens, but once it starts, it will never |
| // get back to be sane. See https://crbug.com/718140. |
| #if !BUILDFLAG(IS_MAC) |
| if (!manager_->HasOpenSession()) { |
| // MidiManager for each platform should be able to shutdown correctly even |
| // if following destruction happens in the middle of StartInitialization(). |
| manager_.reset(); |
| DCHECK(manager_destructor_runner_); |
| DCHECK(manager_destructor_runner_->BelongsToCurrentThread()); |
| manager_destructor_runner_ = nullptr; |
| } |
| #endif |
| return true; |
| } |
| |
| void MidiService::DispatchSendMidiData(MidiManagerClient* client, |
| uint32_t port_index, |
| const std::vector<uint8_t>& data, |
| base::TimeTicks timestamp) { |
| base::AutoLock lock(lock_); |
| |
| // MidiService needs to consider invalid DispatchSendMidiData calls without |
| // an open session that could be sent from a broken renderer. |
| if (manager_) |
| manager_->DispatchSendMidiData(client, port_index, data, timestamp); |
| } |
| |
| scoped_refptr<base::SingleThreadTaskRunner> MidiService::GetTaskRunner( |
| size_t runner_id) { |
| base::AutoLock lock(threads_lock_); |
| if (threads_.size() <= runner_id) |
| threads_.resize(runner_id + 1); |
| if (!threads_[runner_id]) { |
| threads_[runner_id] = std::make_unique<base::Thread>( |
| base::StringPrintf("MidiServiceThread(%zu)", runner_id)); |
| #if BUILDFLAG(IS_WIN) |
| threads_[runner_id]->init_com_with_mta(true); |
| #endif |
| threads_[runner_id]->Start(); |
| } |
| return threads_[runner_id]->task_runner(); |
| } |
| |
| } // namespace midi |