Android（Mstar平台 HDMI OUT 静音流程） _Android

人生必须的知识就是引人向光明方面的明灯。这篇文章主要讲述Android：Mstar平台 HDMI OUT 静音流程相关的知识，希望能为你提供帮助。
一、framework层
1. APP调用 AudioManager 的 adjustStreamVolume() 接口实现在： frameworksaseservicescorejavacomandroidserveraudioAudioservice.java
在判断当前是系统静音操作时，调用 HdmiOutAudioMute Native接口：

if (isMuteAdjust) { boolean state; if (direction == AudioManager.ADJUST_TOGGLE_MUTE) { state = !streamState.mIsMuted; } else { state = direction == AudioManager.ADJUST_MUTE; } if (streamTypeAlias == AudioSystem.STREAM_MUSIC) { setSystemAudioMute(state); /*lxl 20191206 add patch begin*/ PowerManagerService.nativeSetHdmiOutAudioMute(state); /*lxl 20191130 add patch end*/ } for (int stream = 0; stream < mStreamStates.length; stream++) { if (streamTypeAlias == mStreamVolumeAlias[stream]) { if (!(readCameraSoundForced() & & (mStreamStates[stream].getStreamType() == AudioSystem.STREAM_SYSTEM_ENFORCED))) { mStreamStates[stream].mute(state); } } } }

2. nativeSetHdmiOutAudioMute 接口声明在： frameworksaseservicescorejavacomandroidserverpowerPowerManagerService.java

public static native boolean nativeSetHdmiOutAudioMute(boolean onOff);

二、Native层
1.frameworksaseservicescorejnicom_android_server_power_PowerManagerService.cpp 中实现了 nativeSetHdmiOutAudioMute() 方法：

static jboolean nativeSetHdmiOutAudioMute(JNIEnv *env, jclass clazz, jboolean onOff){ std::lock_guard< std::mutex> lock(gPowerHalMutex); if (getInputHal()) { Return< bool> ret = gInputHal-> setHdmiOutAudioMute(onOff); if (!ret.isOk()) { ALOGE("Failed to SetHdmiOutAudioMute."); return false; } return ret; } ALOGE("Failed to SetHdmiOutAudioMute input hal is null."); return false; }

Native方法的声明和注册：

static const JNINativeMethod gPowerManagerServiceMethods[] = { /* name, signature, funcPtr */ ...... {"nativeSetHdmiOutAudioMute", "(Z)Z", (void*) nativeSetHdmiOutAudioMute }, ...... }

int register_android_server_PowerManagerService(JNIEnv* env) { int res = jniRegisterNativeMethods(env, "com/android/server/power/PowerManagerService", gPowerManagerServiceMethods, NELEM(gPowerManagerServiceMethods)); (void) res; // Faked use when LOG_NDEBUG. LOG_FATAL_IF(res < 0, "Unable to register native methods."); // Callbacksjclass clazz; FIND_CLASS(clazz, "com/android/server/power/PowerManagerService"); GET_METHOD_ID(gPowerManagerServiceClassInfo.userActivityFromNative, clazz, "userActivityFromNative", "(JII)V"); // Initialize for (int i = 0; i < = USER_ACTIVITY_EVENT_LAST; i++) { gLastEventTime[i] = LLONG_MIN; } gPowerManagerServiceObj = NULL; return 0; }

2. 上面 gInputHal-> setHdmiOutAudioMute(onOff); 调用是通过HIDL调用HAL层接口， Service的获取：

bool getInputHal(){ if (gInputHal == nullptr){ gInputHal = IMstarTvInput::getService(); if (gInputHal == nullptr) { ALOGD("Load input HAL service fail"); return -1; } }return gInputHal != nullptr; }

三、HAL层
1 HIDL接口定义 vendormstarhardwareinterfaces vinput1.0IMstarTvInput.hal，继承于 TvInput ：

interface IMstarTvInput extends android.hardware.tv.input@1.0::ITvInput { @callflow(next="*") //EpgManager function(31/32) ... setHdmiOutAudioMute(bool bEnable) generates (bool result); ... }

2. 接口的定义 vendormstarhardwareinterfaces vinput1.0defaultTvInput.h, TvInput 又继承于 IMstarTvInput ：

struct TvInput : public IMstarTvInput { TvInput(mstar_tv_input_device_t* device); ~TvInput(); /*mstar tv interface*/ ... Return< bool> setHdmiOutAudioMute(bool bEnable); ... }

3. 具体的方法实现在 vendormstarhardwareinterfaces vinput1.0defaultTvInput_TvManager.cpp

Return< bool> TvInput::setHdmiOutAudioMute(bool bEnable){ return mDevice-> TvManager_dev-> setHdmiOutAudioMute(bEnable); }

4. 其中 mDevice-> TvManager_dev-> setHdmiOutAudioMute() 方法的定义在：vendormstarhardwareinterfaces vinput1.0defaultmstarTvInput_TvManager_dev.h

#ifndef MSTAR_TV_INPUT_TvManager_H #define MSTAR_TV_INPUT_TvManager_H #include < mstar/hardware/tv/input/1.0/ITvManagerType.h> #include "tvmanager/TvManager.h" using ::mstar::hardware::tv::input::V1_0::ITvManagerType; typedef struct mstar_TvManager_dev { ...... bool (*setHdmiOutAudioMute)(bool bEnable); ...... }

5. 其方法实现在 vendormstarhardware v_inputmstar_tv_input_TvManager.cpp

bool mstar_tv_input_TvManager::setHdmiOutAudioMute(bool bEnable){ return g_pTvManagerImpl-> setHdmiOutAudioMute(bEnable); }

g_pTvManagerImpl 是通过 TvManager 转换所得：

void mstar_tv_input_TvManager::registerTvManagerInstance(sp< TvManager> & ptr) { g_pTvManagerImpl=ptr; }

6. TvManager 的接口定义在 vendormstarcommonlibraries vapihidl_wrapper vmanagerTvManager.h

class TvManager : virtual public RefBase { public: TvManager(); ~TvManager(); static sp< TvManager> connect(); void HIDLconnect(); static void disconnect(); status_t setListener(const sp< TvManagerListener> & listener); ... static bool setHdmiOutAudioMute(bool bEnable); ...}

7. 方法实现在 vendormstarsupernovaprojects vos vmanagerlibtvmanagerTvManager.cpp：

bool TvManager::setHdmiOutAudioMute(bool bOnOff) { ALOGV("TvManager setHdmiOutAudioMute "); return getITvManager()-> setHdmiOutAudioMute(bOnOff); }

后面就跳跃到 mstar 的 supernova 层。

四、Supernova层
1. TvManager 的 setHdmiOutAudioMute 实现在 vendormstarsupernovaprojects vos vmanagerlibtvmanagerservice

bool TvManagerService::Client::setHdmiOutAudioMute(bool bOnOff){ TVOS_API_ESTIMATE_START() TVOS_API_ESTIMATE_START(LOCK) Mutex::Autolock lock(m_FuncLock); TVOS_API_ESTIMATE_END(LOCK) ALOGV("TvManagerService::Client::setHdmiOutAudioMute "); bool ret = FALSE; ret = MSrv_Control::GetInstance()-> setHdmiOutAudioMute(bOnOff); TVOS_API_ESTIMATE_END() return ret; }

【Android（Mstar平台 HDMI OUT 静音流程）】2. 最终方法实现在vendormstarsupernovaprojects vos vmanagerlibtvmanagerserviceTvManagerService.cpp，后面便是通过I2C接口对HDMI控制器的操作。

BOOL MSrv_Control_common::setHdmiOutMute(const BOOL bOnOff) { if(MDrv_NT68411_Exist()) { if(bOnOff == FALSE) { MDrv_NT68411_Write(NT68411_SUBCMD_HDMI_MUTE, HDMI_MUTE_OFF); } else { MDrv_NT68411_Write(NT68411_SUBCMD_HDMI_MUTE, HDMI_MUTE_ON); } } return TRUE; }