/** The device information. Extra information can be added in later versions */ struct pw_device_info {
uint32_t id; /**< id of the global */ #define PW_DEVICE_CHANGE_MASK_PROPS (1 << 0) #define PW_DEVICE_CHANGE_MASK_PARAMS (1 << 1) #define PW_DEVICE_CHANGE_MASK_ALL ((1 << 2)-1)
uint64_t change_mask; /**< bitfield of changed fields since last call */ struct spa_dict *props; /**< extra properties */ struct spa_param_info *params; /**< parameters */
uint32_t n_params; /**< number of items in \a params */
};
/** Update and existing \ref pw_device_info with \a update and reset */ struct pw_device_info *
pw_device_info_update(struct pw_device_info *info, conststruct pw_device_info *update); /** Merge and existing \ref pw_device_info with \a update */ struct pw_device_info *
pw_device_info_merge(struct pw_device_info *info, conststruct pw_device_info *update, bool reset); /** Free a \ref pw_device_info */ void pw_device_info_free(struct pw_device_info *info);
/** Device events */ struct pw_device_events { #define PW_VERSION_DEVICE_EVENTS 0
uint32_t version; /** * Notify device info * * \param info info about the device
*/ void (*info) (void *data, conststruct pw_device_info *info); /** * Notify a device param * * Event emitted as a result of the enum_params method. * * \param seq the sequence number of the request * \param id the param id * \param index the param index * \param next the param index of the next param * \param param the parameter
*/ void (*param) (void *data, int seq,
uint32_t id, uint32_t index, uint32_t next, conststruct spa_pod *param);
};
int (*add_listener) (void *object, struct spa_hook *listener, conststruct pw_device_events *events, void *data); /** * Subscribe to parameter changes * * Automatically emit param events for the given ids when * they are changed. * * \param ids an array of param ids * \param n_ids the number of ids in \a ids
*/ int (*subscribe_params) (void *object, uint32_t *ids, uint32_t n_ids);
/** * Enumerate device parameters * * Start enumeration of device parameters. For each param, a * param event will be emitted. * * \param seq a sequence number to place in the reply * \param id the parameter id to enum or PW_ID_ANY for all * \param start the start index or 0 for the first param * \param num the maximum number of params to retrieve * \param filter a param filter or NULL
*/ int (*enum_params) (void *object, int seq, uint32_t id, uint32_t start, uint32_t num, conststruct spa_pod *filter); /** * Set a parameter on the device * * \param id the parameter id to set * \param flags extra parameter flags * \param param the parameter to set
*/ int (*set_param) (void *object, uint32_t id, uint32_t flags, conststruct spa_pod *param);
};
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