android audio 相机按键音：(二)加载与修改

相机按键音资源，加载文件路径：
frameworks/av/services/camera/libcameraservice/CameraService.cpp

按键音，加载函数：
  void CameraService::loadSoundLocked(sound_kind kind) {
      ATRACE_CALL();  
      LOG1("CameraService::loadSoundLocked ref=%d", mSoundRef);
      if (SOUND_SHUTTER == kind && mSoundPlayer[SOUND_SHUTTER] == NULL) {
          // 拍照按键音资源加载 
          mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/product/media/audio/ui/camera_click.ogg");
          if (mSoundPlayer[SOUND_SHUTTER] == nullptr) {
              mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg");
          }
      } else if (SOUND_RECORDING_START == kind && mSoundPlayer[SOUND_RECORDING_START] ==  NULL) {
          // 录像启动按键音资源加载  
          mSoundPlayer[SOUND_RECORDING_START] = newMediaPlayer("/product/media/audio/ui/VideoRecord.ogg");
          if (mSoundPlayer[SOUND_RECORDING_START] == nullptr) {
              mSoundPlayer[SOUND_RECORDING_START] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg");
          }
      } else if (SOUND_RECORDING_STOP == kind && mSoundPlayer[SOUND_RECORDING_STOP] == NULL) {
          // 录像停止按键音资源加载  
          mSoundPlayer[SOUND_RECORDING_STOP] = newMediaPlayer("/product/media/audio/ui/VideoStop.ogg");
          if (mSoundPlayer[SOUND_RECORDING_STOP] == nullptr) {
              mSoundPlayer[SOUND_RECORDING_STOP] = newMediaPlayer("/system/media/audio/ui/VideoStop.ogg");
          }
      }
  }

用户可以自定义修改，按键音：
替换按键音资源，直接替换camera_click.ogg，VideoRecord.ogg，VideoStop.ogg。
禁止按键音，可以直接删除资源或在资源加载过程进行禁止修改。

声音资源路径：
frameworks\base\data\sounds\effects\ogg
camera_click.ogg
camera_click_48k.ogg

adb查看设备，声音资源路径：
a71x:/system/media/audio/ui $ ls -al camera* 
-rw-r--r-- 1 root root 8703 2008-12-31 23:00 camera_click.ogg 
-rw-r--r-- 1 root root 9376 2008-12-31 23:00 camera_focus.ogg