Change CAMERA_MSG_METADATA_FACE to CAMERA_MSG_PREVIEW_METADATA.

    CAMERA_MSG_RAW_IMAGE = 0x0080,        // dataCallback

    CAMERA_MSG_COMPRESSED_IMAGE = 0x0100, // dataCallback

    CAMERA_MSG_RAW_IMAGE_NOTIFY = 0x0200, // dataCallback

    // Face metadata. This can be combined with CAMERA_MSG_PREVIEW_FRAME in

    // dataCallback. For example, the apps can request PREVIEW_FRAME and FACE.

    // Or the apps can request only PREVIEW_FRAME or only FACE.

    CAMERA_MSG_METADATA_FACE = 0x0400,    // dataCallback

    // Preview frame metadata. This can be combined with

    // CAMERA_MSG_PREVIEW_FRAME in dataCallback. For example, the apps can

    // request FRAME and METADATA. Or the apps can request only FRAME or only

    // METADATA.

    CAMERA_MSG_PREVIEW_METADATA = 0x0400, // dataCallback

    CAMERA_MSG_ALL_MSGS = 0xFFFF

};