HarmonyOS 自研播放器如何处理音频抢占焦点事件，没有用avplayer/audiorender

ohaudio支持监听音频打断https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/using-ohaudio-for-playback-V5

参考示例

// 自定义音频中断事件函数
int32_t MyOnInterruptEvent(OH_AudioRenderer *renderer, void *userData, OH_AudioInterrupt_ForceType type,
OH_AudioInterrupt_Hint hint) {
  // 根据type和hint表示的音频中断信息，更新播放器状态和界面
  LOGI("MyOnInterruptEvent ForceType: %{public}d, Hint: %{public}d", type, hint);
  switch (hint) {
    case AUDxxxTREAM_INTERRUPT_HINT_NONE:
      break;

    case AUDxxxTREAM_INTERRUPT_HINT_RESUME:
      OH_AudioRenderer_Start(audioRenderer);
      break;

    case AUDxxxTREAM_INTERRUPT_HINT_PAUSE:
      OH_AudioRenderer_Pause(audioRenderer);
      break;

    case AUDxxxTREAM_INTERRUPT_HINT_STOP:
      OH_AudioRenderer_Stop(audioRenderer);
      break;

    case AUDxxxTREAM_INTERRUPT_HINT_DUCK:
      break;

    case AUDxxxTREAM_INTERRUPT_HINT_UNDUCK:
      break;

    default:
      LOGI("无法识别中断事件");
  }