android 系统上做GC双模的--音频通路等相关设计分析 【转】
转自:http://blog.csdn.net/basonjiang_sz/article/details/6255893?reload
一:通话相关的语音通路切换原理、震动接口 6、语音通路 6.1、设置语音通路的路由 目前我们有两处处理: a、CallTracker.java中的 handlePollCalls() 检测到+clcc返回的电话列表中有状态为DriverCall.State.ALERTING(表示拨打电话后,对方已经振铃),此时需要设置语音通路为MODE_IN_CALL b、PhoneUtils.java中setAudioMode()函数 c、调用通路分析 AudioManager audioManager = (AudioManager) context.getSystemService (Context.AUDIO_SERVICE); audioManager.setMode(mode); AudioManager.setMode(mode); AudioService.setMode(mode); AudioSystem.setMode(mode);(native function) android_media_AudioSystem.cpp==>android_media_AudioSystem_setMode() AudioSystem.cpp==>setMode() const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger(); binder = sm->getService(String16("media.audio_flinger")); ... gAudioFlinger = interface_cast<IAudioFlinger>(binder); ... return gAudioFlinger; 通过查找“media.audio_flinger”发现AudioFlinger.cpp==>instantiate()//Main_mediaserver.cpp中被实例化。 defaultServiceManager()->addService(String16("media.audio_flinger"), new AudioFlinger()); mAudioHardware = AudioHardwareInterface::create(); LOGV("Creating Vendor Specific AudioHardware"); hw = createAudioHardware(); return new AudioHardwareMarvell(); return af->setMode(mode); AudioHardwareLittle.cpp==>setMode(mode) doRouting(); enable_incall_headphone()//or others... system("alsactl -f /etc/alsactl/asound.state_none restore"); system("alsactl -f /etc/alsactl/asound.state_headset_r_s restore"); 6.2、来电播放振铃,挂断或接听停止振铃。 ==>Phone.app onCreate() ringer = new Ringer(phone); Vibrator mVibrator = new Vibrator(); mService = IHardwareService.Stub.asInterface(ServiceManager.getService("hardware")); notifier = new CallNotifier(this, phone, ringer, mBtHandsfree); mPhone.registerForIncomingRing(this, PHONE_INCOMING_RING, null); mPhone.registerForPhoneStateChanged(this, PHONE_STATE_CHANGED, null); mPhone.registerForDisconnect(this, PHONE_DISCONNECT, null); ... case PHONE_INCOMING_RING: mRinger.ring(); mHardwareService.setAttentionLight(true); mVibratorThread.start(); while (mContinueVibrating) { mVibrator.vibrate(VIBRATE_LENGTH); SystemClock.sleep(VIBRATE_LENGTH + PAUSE_LENGTH); } ... makeLooper(); mRingHandler.sendEmptyMessage(PLAY_RING_ONCE); ... case PLAY_RING_ONCE: PhoneUtils.setAudioMode(mContext, AudioManager.MODE_RINGTONE); r.play(); ... case PHONE_DISCONNECT: case PHONE_STATE_CHANGED: ... mRinger.stopRing(); Message msg = mRingHandler.obtainMessage(STOP_RING); msg.obj = mRingtone; mRingHandler.sendMessage(msg); case STOP_RING: r.stop(); getLooper().quit(); ... mVibrator.cancel(); 二:通话相关的notification服务 7、通话相关的notification服务。 7.1、NotificationMgr ==>PhoneApp.java onCreate() NotificationMgr.init(this)//NotificationMgr.java//此类主要负责电话通知的具体表现(通知和取消通知),未接图标、通话中、蓝牙激活中、保持中,静音、免提等。封装了简单的瞬间显示文本消息的功能。提供漫游数据连接禁止的通知封装和漫游数据连接允许时取消通知 sMe = new NotificationMgr(context); mNotificationMgr = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); mStatusBar = (StatusBarManager) context.getSystemService(Context.STATUS_BAR_SERVICE); //主要用于显示静音和speaker状态的图表(在状态条右边显示) sMe.updateNotifications();//主要功能是: 1、查询是否有未读的未接听电话,并显示到状态栏图标,和通知列表 2、根据是否是电话状态,更新状态栏图表和通知列表(可能是激活,蓝牙,保持等) 7.2、CallNotifier ==>PhoneApp.java onCreate() notifier = new CallNotifier(this, phone, ringer, mBtHandsfree);//此类主要是监听通话相关的事件,然后进行例如来电播放铃声,震动。挂断、接听停止振铃等(调用Ringer类实现此功能),根据不同的状态调用调用NotificationMgr进行具体的通知和取消通知。 三: 通话相关的各种server 电话通信相关的服务: (1)、从ServiceManager得到的: a、wifiService b、PhoneInterfaceManager c、PhoneSubInfo d、SimPhoneBookInterfaceManager e、SimSmsInterfaceManager f、TelephonyRegistry g、NetStatService h、ConnectivityService (2)、从ApplicationContext得到的: a、TelephonyManager