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// Copyright 2014 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_usb.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/stringprintf.h"
#include "media/midi/midi_scheduler.h"
#include "media/midi/usb_midi_descriptor_parser.h"
#include "media/midi/usb_midi_device.h"
#include "media/midi/usb_midi_input_stream.h"
#include "media/midi/usb_midi_jack.h"
#include "media/midi/usb_midi_output_stream.h"
namespace media {
namespace midi {
MidiManagerUsb::MidiManagerUsb(scoped_ptr<UsbMidiDevice::Factory> factory)
: device_factory_(factory.Pass()) {
}
MidiManagerUsb::~MidiManagerUsb() {
}
void MidiManagerUsb::StartInitialization() {
Initialize(
base::Bind(&MidiManager::CompleteInitialization, base::Unretained(this)));
}
void MidiManagerUsb::Initialize(
base::Callback<void(MidiResult result)> callback) {
initialize_callback_ = callback;
scheduler_.reset(new MidiScheduler(this));
// This is safe because EnumerateDevices cancels the operation on destruction.
device_factory_->EnumerateDevices(
this,
base::Bind(&MidiManagerUsb::OnEnumerateDevicesDone,
base::Unretained(this)));
}
void MidiManagerUsb::DispatchSendMidiData(MidiManagerClient* client,
uint32_t port_index,
const std::vector<uint8>& data,
double timestamp) {
if (port_index >= output_streams_.size()) {
// |port_index| is provided by a renderer so we can't believe that it is
// in the valid range.
return;
}
// output_streams_[port_index] is alive unless MidiManagerUsb is deleted.
// The task posted to the MidiScheduler will be disposed safely on deleting
// the scheduler.
scheduler_->PostSendDataTask(
client, data.size(), timestamp,
base::Bind(&UsbMidiOutputStream::Send,
base::Unretained(output_streams_[port_index]), data));
}
void MidiManagerUsb::ReceiveUsbMidiData(UsbMidiDevice* device,
int endpoint_number,
const uint8* data,
size_t size,
base::TimeTicks time) {
if (!input_stream_)
return;
input_stream_->OnReceivedData(device,
endpoint_number,
data,
size,
time);
}
void MidiManagerUsb::OnDeviceAttached(scoped_ptr<UsbMidiDevice> device) {
int device_id = static_cast<int>(devices_.size());
devices_.push_back(device.Pass());
AddPorts(devices_.back(), device_id);
}
void MidiManagerUsb::OnDeviceDetached(size_t index) {
if (index >= devices_.size()) {
return;
}
UsbMidiDevice* device = devices_[index];
for (size_t i = 0; i < output_streams_.size(); ++i) {
if (output_streams_[i]->jack().device == device) {
SetOutputPortState(static_cast<uint32>(i), MIDI_PORT_DISCONNECTED);
}
}
const std::vector<UsbMidiJack>& input_jacks = input_stream_->jacks();
for (size_t i = 0; i < input_jacks.size(); ++i) {
if (input_jacks[i].device == device) {
SetInputPortState(static_cast<uint32>(i), MIDI_PORT_DISCONNECTED);
}
}
}
void MidiManagerUsb::OnReceivedData(size_t jack_index,
const uint8* data,
size_t size,
base::TimeTicks time) {
ReceiveMidiData(static_cast<uint32>(jack_index), data, size, time);
}
void MidiManagerUsb::OnEnumerateDevicesDone(bool result,
UsbMidiDevice::Devices* devices) {
if (!result) {
initialize_callback_.Run(MIDI_INITIALIZATION_ERROR);
return;
}
input_stream_.reset(new UsbMidiInputStream(this));
devices->swap(devices_);
for (size_t i = 0; i < devices_.size(); ++i) {
if (!AddPorts(devices_[i], static_cast<int>(i))) {
initialize_callback_.Run(MIDI_INITIALIZATION_ERROR);
return;
}
}
initialize_callback_.Run(MIDI_OK);
}
bool MidiManagerUsb::AddPorts(UsbMidiDevice* device, int device_id) {
UsbMidiDescriptorParser parser;
std::vector<uint8> descriptor = device->GetDescriptors();
const uint8* data = descriptor.size() > 0 ? &descriptor[0] : NULL;
std::vector<UsbMidiJack> jacks;
bool parse_result = parser.Parse(device,
data,
descriptor.size(),
&jacks);
if (!parse_result)
return false;
std::string manufacturer(device->GetManufacturer());
std::string product_name(device->GetProductName());
std::string version(device->GetDeviceVersion());
for (size_t j = 0; j < jacks.size(); ++j) {
// Port ID must be unique in a MIDI manager. This ID setting is
// sufficiently unique although there is no user-friendly meaning.
// TODO(yhirano): Use a hashed string as ID.
std::string id(
base::StringPrintf("port-%d-%ld", device_id, static_cast<long>(j)));
if (jacks[j].direction() == UsbMidiJack::DIRECTION_OUT) {
output_streams_.push_back(new UsbMidiOutputStream(jacks[j]));
AddOutputPort(MidiPortInfo(id, manufacturer, product_name, version,
MIDI_PORT_OPENED));
} else {
DCHECK_EQ(jacks[j].direction(), UsbMidiJack::DIRECTION_IN);
input_stream_->Add(jacks[j]);
AddInputPort(MidiPortInfo(id, manufacturer, product_name, version,
MIDI_PORT_OPENED));
}
}
return true;
}
} // namespace midi
} // namespace media
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