device/bluetooth: Add BluetoothAudioSinkChromeOS.

device/bluetooth/bluetooth_audio_sink_chromeos.cc

+// Copyright 2015 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 "device/bluetooth/bluetooth_audio_sink_chromeos.h"
+
+#include <sstream>
+
+#include "base/logging.h"
+
+namespace {
+
+// TODO(mcchou): Add the constant to dbus/service_constants.h.
+const char kBluetoothAudioSinkServicePath[] = "/org/chromium/AudioSink";
+
+}  // namespace
+
+namespace chromeos {
+
+BluetoothAudioSinkChromeOS::BluetoothAudioSinkChromeOS(
+    BluetoothAdapterChromeOS* adapter)
+    : state_(device::BluetoothAudioSink::STATE_INVALID),
+      present_(false),
+      powered_(false),
+      volume_(0),
+      read_mtu_(0),
+      write_mtu_(0),
+      adapter_(adapter),
+      weak_ptr_factory_(this) {
+  DCHECK(adapter_);
+
+  present_ = adapter_->IsPresent();
+  powered_ = adapter_->IsPowered();
+  if (present_ && powered_)
+    state_ = device::BluetoothAudioSink::STATE_DISCONNECTED;
+  adapter_->AddObserver(this);
+}
+
+BluetoothAudioSinkChromeOS::~BluetoothAudioSinkChromeOS() {
+  DCHECK(adapter_);
+  adapter_->RemoveObserver(this);
+}
+
+unsigned int BluetoothAudioSinkChromeOS::sequence_number = 0;

[armansito, 2015/01/21 00:25:56]

nit: Add "// static" before assignment.

+
+dbus::ObjectPath BluetoothAudioSinkChromeOS::GenerateEndpointPath() {

[armansito, 2015/01/21 00:25:56]

nit: Add "// static" before function definition.

+  ++sequence_number;

[armansito, 2015/01/21 00:25:56]

Also add a note here saying why it's OK for this to overflow. Basically,
exporting an object with an existing path will fail at that time and that we
don't care about finding unused ones since the maximum number is sufficiently
large.

[armansito, 2015/01/21 00:25:56]

Paths start at 1 then? Just making sure that this will never use "0" as a number
unless it overflows.

+  std::stringstream path;
+  path << kBluetoothAudioSinkServicePath << "/endpoint" << sequence_number;
+  return dbus::ObjectPath(path.str());
+}
+
+void BluetoothAudioSinkChromeOS::AddObserver(
+    device::BluetoothAudioSink::Observer* observer) {
+  DCHECK(observer);
+  observers_.AddObserver(observer);
+}
+
+void BluetoothAudioSinkChromeOS::RemoveObserver(
+    device::BluetoothAudioSink::Observer* observer) {
+  DCHECK(observer);
+  observers_.RemoveObserver(observer);
+}
+
+device::BluetoothAudioSink::State BluetoothAudioSinkChromeOS::GetState() const {
+  return state_;
+}
+
+uint16_t BluetoothAudioSinkChromeOS::GetVolume() const {
+  return volume_;
+}
+
+void BluetoothAudioSinkChromeOS::AdapterPresentChanged(
+    device::BluetoothAdapter* adapter,
+    bool present) {
+  // TODO(mcchou): BUG=441581
+  // If |persent| is true, change state to |STATE_DISCONNECTED| and call
+  // StateChanged(). Otherwise, change state to |STATE_INVALID| and call
+  // StateChanged.
+}
+
+void BluetoothAudioSinkChromeOS::AdapterPoweredChanged(
+    device::BluetoothAdapter* adapter,
+    bool powered) {
+  // TODO(mcchou): BUG=441581
+  // If |powered| is true, change state to |STATE_DISCONNECTED| and call
+  // StateChanged(). Otherwise, change state to |STATE_INVALID| and call
+  // StateChanged.
+}
+
+void BluetoothAudioSinkChromeOS::MediaAdded(
+    const dbus::ObjectPath& object_path) {
+  // Do nothing for now.
+}
+
+void BluetoothAudioSinkChromeOS::MediaRemoved(
+    const dbus::ObjectPath& object_path) {
+  // TODO(mcchou): BUG=441581
+  // Check if |object_path| equals to |media_path_|. If true, change the state
+  // of the audio sink, call StateChanged and reset the audio sink.
+}
+
+void BluetoothAudioSinkChromeOS::MediaTransportAdded(
+    const dbus::ObjectPath& object_path) {
+  // Do nothing for now.
+}
+
+void BluetoothAudioSinkChromeOS::MediaTransportRemoved(
+    const dbus::ObjectPath& object_path) {
+  // TODO(mcchou): BUG=441581
+  // Check if |object_path| equals to |transport_path_|. If true, change the
+  // state of the audio sink, call StateChanged and reset the audio sink.
+}
+
+void BluetoothAudioSinkChromeOS::MediaTransportPropertyChanged(
+    const dbus::ObjectPath& object_path,
+    const std::string& property_name) {
+  // TODO(mcchou): BUG=441581
+  // Call StateChanged and VolumeChanged accordingly if there is any change on
+  // state/volume.
+}
+
+void BluetoothAudioSinkChromeOS::SetConfiguration(
+    const dbus::ObjectPath& transport_path,
+    const dbus::MessageReader& properties) {
+  // TODO(mcchou): BUG=441581
+  // Update |transport_path_| and store properties if needed.
+}
+
+void BluetoothAudioSinkChromeOS::SelectConfiguration(
+    const std::vector<uint8_t>& capabilities,
+    const SelectConfigurationCallback& callback) {
+  // TODO(mcchou): BUG=441581
+  // Use SelectConfigurationCallback to return the agreed capabilities.
+}
+
+void BluetoothAudioSinkChromeOS::ClearConfiguration(
+    const dbus::ObjectPath& transport_path) {
+  // TODO(mcchou): BUG=441581
+  // Reset the configuration to the default one and close IOBuffer.
+}
+
+void BluetoothAudioSinkChromeOS::Release() {
+  // TODO(mcchou): BUG=441581
+  // Let the audio sink does the clean-up and do nothing here.
+}
+
+void Register(
+    const device::BluetoothAudioSink::Options& options,
+    const base::Closure& callback,
+    const device::BluetoothAudioSink::ErrorCallback& error_callback) {
+  // TODO(mcchou): BUG=441581
+  // Get Media object, initiate an Media Endpoint with options, and return the
+  // audio sink via callback. Add the audio sink as observer of both Media and
+  // Media Transport.
+}
+
+void Unregister(
+    const base::Closure& callback,
+    const device::BluetoothAudioSink::ErrorCallback& error_callback) {
+  // TODO(mcchou): BUG=441581
+  // Clean |observers_| and transport_path_ and reset state_ and volume.
+}
+
+void BluetoothAudioSinkChromeOS::StateChanged(
+    device::BluetoothAudioSink::State state) {
+  DCHECK_NE(state, state_);
+  VLOG(1) << "Bluetooth audio sink state changed: " << state;
+  state_ = state;
+  FOR_EACH_OBSERVER(device::BluetoothAudioSink::Observer, observers_,
+                    BluetoothAudioSinkStateChanged(this, state_));
+}
+
+void BluetoothAudioSinkChromeOS::VolumeChanged(uint16_t volume) {
+  DCHECK_NE(volume, volume_);
+  VLOG(1) << "Bluetooth audio sink volume changed: " << volume;
+  volume_ = volume;
+  FOR_EACH_OBSERVER(device::BluetoothAudioSink::Observer, observers_,
+                    BluetoothAudioSinkVolumeChanged(this, volume_));
+}
+
+void BluetoothAudioSinkChromeOS::ReadFromFD() {
+  DCHECK_NE(fd_.value(), -1);
+
+  // TODO(mcchou): BUG=441581
+  // Read from file descriptor using watcher and create a buffer to contain the
+  // data. Notify |Observers_| while there is audio data available.
+}
+
+}  // namespace chromeos