xbmc遥控音量加处理过程总结

AndroidKey.cpp将scancode装换为sym，并形成XBMC_Key

//xbmc/android/activity/AndroidKey.cpptypedef struct {  int32_t nativeKey;  int16_t xbmcKey;} KeyMap;static KeyMap keyMap[] = {  { AKEYCODE_VOLUME_UP       , XBMCK_PLUS },};bool CAndroidKey::onKeyboardEvent(AInputEvent *event){  int32_t flags   = AKeyEvent_getFlags(event);  int32_t state   = AKeyEvent_getMetaState(event);  int32_t action  = AKeyEvent_getAction(event);  int32_t repeat  = AKeyEvent_getRepeatCount(event);  int32_t keycode = AKeyEvent_getKeyCode(event);  int32_t deviceId = AInputEvent_getDeviceId(event);  CJNIKeyCharacterMap map = CJNIKeyCharacterMap::load(deviceId);  uint16_t unicode = map.get(keycode, state);  // Check if we got some special key  uint16_t sym = XBMCK_UNKNOWN;  for (unsigned int index = 0; index < sizeof(keyMap) / sizeof(KeyMap); index++)  {    if (keycode == keyMap[index].nativeKey)    {      sym = keyMap[index].xbmcKey;      break;    }  }  switch (action)  {    case AKEY_EVENT_ACTION_DOWN:  CXBMCApp::android_printf("CAndroidKey: key down (code: %d; repeat: %d; flags: 0x%0X; alt: %s; shift: %s; sym: %s)",        keycode, repeat, flags,        (state & AMETA_ALT_ON) ? "yes" : "no",        (state & AMETA_SHIFT_ON) ? "yes" : "no",        (state & AMETA_SYM_ON) ? "yes" : "no");      XBMC_Key((uint8_t)keycode, sym, modifiers, unicode, false);      return true;  ...   }}

keyMap[index].nativeKey的值在这儿定义的这句话

/*tools/depends/target/android-sources-ics/android-source/frameworks/base/native/include/android/keycodes.h*/enum {    AKEYCODE_VOLUME_UP       = 24,    ...}

接下来就是把android键盘打包为xbmc内部的XBMC_Event，扔到消息队列中

void CAndroidKey::XBMC_Key(uint8_t code, uint16_t key, uint16_t modifiers, uint16_t unicode, bool up){  XBMC_Event newEvent;  memset(&newEvent, 0, sizeof(newEvent));  unsigned char type = up ? XBMC_KEYUP : XBMC_KEYDOWN;  newEvent.type = type;  newEvent.key.type = type;  newEvent.key.keysym.scancode = code;  newEvent.key.keysym.sym = (XBMCKey)key;  newEvent.key.keysym.unicode = unicode;  newEvent.key.keysym.mod = (XBMCMod)modifiers;  //CXBMCApp::android_printf("XBMC_Key(%u, %u, 0x%04X, %d)", code, key, modifiers, up);  CWinEvents::MessagePush(&newEvent);}

传到Application.cpp的OnEvent，由XBMC_Event获得CKey对象

//xbmc/Application.cppbool CApplication::OnEvent(XBMC_Event& newEvent){  switch(newEvent.type)  {    case XBMC_QUIT: //退出xbmc        ...        CApplicationMessenger::Get().Quit();    break;    case XBMC_KEYDOWN:        //这里一句输出了：Keyboard: scancode: 0x18, sym: 0x002b, unicode: 0x0000, modifier: 0x0        g_application.OnKey(g_Keyboard.ProcessKeyDown(newEvent.key.keysym));    break;    }}

CKey获取CAction对象

//xbmc/Application.cppbool CApplication::OnKey(const CKey& key){...  int iWin = GetActiveWindowID();  CAction action = CButtonTranslator::GetInstance().GetAction(iWin, key);...  if (!key.IsAnalogButton())    CLog::LogF(LOGDEBUG, "%s pressed, action is %s",         g_Keyboard.GetKeyName((int) key.GetButtonCode()).c_str(), action.GetName().c_str());  return ExecuteInputAction(action);}

bool CApplication::ExecuteInputAction(const CAction &action){  bool bResult = false;  // play sound before the action unless the button is held,  // where we execute after the action as held actions aren't fired every time.    bResult = OnAction(action);    ...  g_audioManager.PlayActionSound(action);//播放按键音  return bResult;}bool CApplication::OnAction(const CAction &action){    ...  if (action.GetAmount() && (action.GetID() == ACTION_VOLUME_UP || action.GetID() == ACTION_VOLUME_DOWN))  {    if (!m_pPlayer->IsPassthrough())    {    ...      SetVolume(volume, false);    }    ShowVolumeBar(&action);    return true;  }    ...}

ACTION_VOLUME_UP的值在哪里定义的呢

//xbmc/guilib/Key.h#define ACTION_VOLUME_UP 88

void CApplication::VolumeChanged() const{  CVariant data(CVariant::VariantTypeObject);  data["volume"] = GetVolume();  data["muted"] = m_muted;  CAnnouncementManager::Get().Announce(Application, "xbmc", "OnVolumeChanged", data);  // if player has volume control, set it.  if (m_pPlayer->ControlsVolume())  {     m_pPlayer->SetVolume(m_volumeLevel);     m_pPlayer->SetMute(m_muted);  }}

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