/** Logarithmic representation of sound pressure relative to a
* reference value. */
SR_MQ_SOUND_PRESSURE_LEVEL,
/** Logarithmic representation of sound pressure relative to a
* reference value. */
SR_MQ_SOUND_PRESSURE_LEVEL,
int (*event) (struct sr_output *o, int event_type, uint8_t **data_out,
uint64_t *length_out);
GString *(*recv) (struct sr_output *o, const struct sr_dev_inst *sdi,
int (*event) (struct sr_output *o, int event_type, uint8_t **data_out,
uint64_t *length_out);
GString *(*recv) (struct sr_output *o, const struct sr_dev_inst *sdi,