device/bluetooth: Implement Unregister() of BlueotoothAudioSinkChromeOS and disconnection-related c…

device/bluetooth/bluetooth_audio_sink.cc

 // 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 "device/bluetooth/bluetooth_audio_sink.h"
 
 namespace {
 
 // SBC codec(0x00) is the mandatory codec for A2DP audio sink.
 // |capabilities| includes the mandatory support for A2DP audio sink.
 // [Octet0]: 0x3f
 //   Sampling frequency [0 0 1 1]: supports 44100 Hz and 48000 Hz.
 //   Channel mode [1 1 1 1]: supports Mono, Dual Channel, Stereo, and Joint
 //                           Stereo.
 // [Octet1]: 0xff
 //    Block length [1, 1, 1, 1]: supports block length of 4, 8, 12 and 16.
 //    Subbands [1, 1]: supports 4 and 8 subbands.
 //    Allocation Method [1, 1]: supports SNR and Loudness.
 // [Octet2]: 0x12
 //    Minimum bitpool value: 18 is the bitpool value for Mono.
 // [Octet3]: 0x35
 //    Maximum bitpool value: 53 is the bitpool value for Joint Stereo.
   const uint8_t kDefaultCodec = 0x00;
   const uint8_t kDefaultCapabilities[] = {0x3f, 0xff, 0x12, 0x35};
 
 }  // namespace
 
 namespace device {
 
+// static
+const uint16_t BluetoothAudioSink::kInvalidVolume = 128;
+
 BluetoothAudioSink::Options::Options() : codec(kDefaultCodec) {
   capabilities.assign(kDefaultCapabilities,
                       kDefaultCapabilities + sizeof(kDefaultCapabilities));
 }
 
 BluetoothAudioSink::Options::~Options() {
 }
 
 BluetoothAudioSink::BluetoothAudioSink() {
 }
 
 BluetoothAudioSink::~BluetoothAudioSink() {
 }
 
 }  // namespace device