Pressure Management (C/C++)

Starting from API version 20, the camera framework supports monitoring of system pressure levels.

In scenarios requiring prolonged camera usage (such as live streaming), applications can dynamically adjust image quality parameters (such as the frame rate or resolution) based on system pressure level changes. This helps balance power consumption, heat generation, and system load, ensuring stable and extended camera functionality.

Status Listening

To monitor system pressure status changes, register the OH_CaptureSession_OnSystemPressureLevelChange callback.

When the system pressure level changes, the callback returns the Camera_SystemPressureLevel parameter.

For details about this parameter, see Camera_SystemPressureLevel.

void SystemPressureLevelChangeCallback(Camera_CaptureSession* captureSession, Camera_SystemPressureLevel systemPressureLevel)
{
   OH_LOG_INFO(LOG_APP, "SystemPressureLevelChangeCallback is called.");
}

Camera_ErrorCode RegisterSystemPressureCallback(Camera_CaptureSession* captureSession)
{
    Camera_ErrorCode ret = OH_CaptureSession_RegisterSystemPressureLevelChangeCallback(captureSession,
       SystemPressureLevelChangeCallback);
    if (ret != CAMERA_OK) {
       OH_LOG_ERROR(LOG_APP, "OH_CaptureSession_RegisterSystemPressureLevelChangeCallback failed.");
    }
    return ret;
}