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// 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/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<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::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<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
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