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// Copyright (c) 2013 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_manager.h"
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/message_loop/message_loop.h"
#include "base/message_loop/message_loop_proxy.h"
namespace media {
MidiManager::MidiManager()
: initialized_(false),
result_(MIDI_NOT_SUPPORTED) {
}
MidiManager::~MidiManager() {
}
#if !defined(OS_MACOSX) && !defined(OS_WIN) && !defined(USE_ALSA) && \
!defined(OS_ANDROID) && !defined(OS_CHROMEOS)
MidiManager* MidiManager::Create() {
return new MidiManager;
}
#endif
void MidiManager::StartSession(MidiManagerClient* client, int client_id) {
bool session_is_ready;
bool session_needs_initialization = false;
bool too_many_pending_clients_exist = false;
{
base::AutoLock auto_lock(lock_);
session_is_ready = initialized_;
if (!session_is_ready) {
// Do not accept a new request if the pending client list contains too
// many clients.
too_many_pending_clients_exist =
pending_clients_.size() >= kMaxPendingClientCount;
if (!too_many_pending_clients_exist) {
// Call StartInitialization() only for the first request.
session_needs_initialization = pending_clients_.empty();
pending_clients_.insert(std::make_pair(client, client_id));
}
}
}
// Lazily initialize the MIDI back-end.
if (!session_is_ready) {
if (session_needs_initialization) {
TRACE_EVENT0("midi", "MidiManager::StartInitialization");
session_thread_runner_ =
base::MessageLoop::current()->message_loop_proxy();
StartInitialization();
}
if (too_many_pending_clients_exist) {
// Return an error immediately if there are too many requests.
client->CompleteStartSession(client_id, MIDI_INITIALIZATION_ERROR);
return;
}
// CompleteInitialization() will be called asynchronously when platform
// dependent initialization is finished.
return;
}
// Platform dependent initialization was already finished for previously
// initialized clients.
MidiResult result;
{
base::AutoLock auto_lock(lock_);
if (result_ == MIDI_OK)
clients_.insert(client);
result = result_;
}
client->CompleteStartSession(client_id, result);
}
void MidiManager::EndSession(MidiManagerClient* client) {
base::AutoLock auto_lock(lock_);
clients_.erase(client);
pending_clients_.erase(client);
}
void MidiManager::DispatchSendMidiData(MidiManagerClient* client,
uint32 port_index,
const std::vector<uint8>& data,
double timestamp) {
NOTREACHED();
}
void MidiManager::StartInitialization() {
CompleteInitialization(MIDI_NOT_SUPPORTED);
}
void MidiManager::CompleteInitialization(MidiResult result) {
DCHECK(session_thread_runner_.get());
// It is safe to post a task to the IO thread from here because the IO thread
// should have stopped if the MidiManager is going to be destructed.
session_thread_runner_->PostTask(
FROM_HERE,
base::Bind(&MidiManager::CompleteInitializationInternal,
base::Unretained(this),
result));
}
void MidiManager::AddInputPort(const MidiPortInfo& info) {
input_ports_.push_back(info);
}
void MidiManager::AddOutputPort(const MidiPortInfo& info) {
output_ports_.push_back(info);
}
void MidiManager::ReceiveMidiData(
uint32 port_index,
const uint8* data,
size_t length,
double timestamp) {
base::AutoLock auto_lock(lock_);
for (ClientList::iterator i = clients_.begin(); i != clients_.end(); ++i)
(*i)->ReceiveMidiData(port_index, data, length, timestamp);
}
void MidiManager::CompleteInitializationInternal(MidiResult result) {
TRACE_EVENT0("midi", "MidiManager::CompleteInitialization");
base::AutoLock auto_lock(lock_);
DCHECK(clients_.empty());
DCHECK(!initialized_);
initialized_ = true;
result_ = result;
for (PendingClientMap::iterator it = pending_clients_.begin();
it != pending_clients_.end();
++it) {
if (result_ == MIDI_OK)
clients_.insert(it->first);
it->first->CompleteStartSession(it->second, result_);
}
pending_clients_.clear();
}
} // namespace media
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