// Copyright 2016 The Chromium Authors. All rights reserved. // 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/threading/thread_task_runner_handle.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 MidiService::ManagerFactory::Create( MidiService* service) { return std::unique_ptr(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()) {} MidiService::MidiService(std::unique_ptr factory) : manager_factory_(std::move(factory)), task_service_(std::make_unique()) {} 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::ThreadTaskRunnerHandle::Get(); } 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& 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 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::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