extern SR_PRIV struct sr_output_module output_wav;
extern SR_PRIV struct sr_output_module output_wavedrom;
extern SR_PRIV struct sr_output_module output_null;
extern SR_PRIV struct sr_output_module output_wav;
extern SR_PRIV struct sr_output_module output_wavedrom;
extern SR_PRIV struct sr_output_module output_null;