/** * \defgroup spa_device Device * * The device interface can be used to monitor all kinds of devices * and create objects as a result. Objects a typically other * Devices or Nodes. *
*/
/** * Information about the device and parameters it supports * * This information is part of the info event on a device.
*/ struct spa_device_info { #define SPA_VERSION_DEVICE_INFO 0
uint32_t version;
#define SPA_DEVICE_CHANGE_MASK_FLAGS (1u<<0) #define SPA_DEVICE_CHANGE_MASK_PROPS (1u<<1) #define SPA_DEVICE_CHANGE_MASK_PARAMS (1u<<2)
uint64_t change_mask;
uint64_t flags; conststruct spa_dict *props; /**< device properties */ struct spa_param_info *params; /**< supported parameters */
uint32_t n_params; /**< number of elements in params */
};
/** * Information about a device object * * This information is part of the object_info event on the device.
*/ struct spa_device_object_info { #define SPA_VERSION_DEVICE_OBJECT_INFO 0
uint32_t version;
constchar *type; /**< the object type managed by this device */ constchar *factory_name; /**< a factory name that implements the object */
/** * spa_device_events: * * Events are always emitted from the main thread
*/ struct spa_device_events { /** version of the structure */ #define SPA_VERSION_DEVICE_EVENTS 0
uint32_t version;
/** notify extra information about the device */ void (*info) (void *data, conststruct spa_device_info *info);
/** notify a result */ void (*result) (void *data, int seq, int res, uint32_t type, constvoid *result);
/** info changed for an object managed by the device, info is NULL when
* the object is removed */ void (*object_info) (void *data, uint32_t id, conststruct spa_device_object_info *info);
};
/** * spa_device_methods:
*/ struct spa_device_methods { /* the version of the methods. This can be used to expand this
* structure in the future */ #define SPA_VERSION_DEVICE_METHODS 0
uint32_t version;
/** * Set events to receive asynchronous notifications from * the device. * * Setting the events will trigger the info event and an * object_info event for each managed object on the new * listener. * * \param object a \ref spa_device * \param listener a listener * \param events a struct \ref spa_device_events * \param data data passed as first argument in functions of \a events * \return 0 on success * < 0 errno on error
*/ int (*add_listener) (void *object, struct spa_hook *listener, conststruct spa_device_events *events, void *data); /** * Perform a sync operation. * * This method will emit the result event with the given sequence * number synchronously or with the returned async return value * asynchronously. * * Because all methods are serialized in the device, this can be used * to wait for completion of all previous method calls. * * \param seq a sequence number * \return 0 on success * -EINVAL when node is NULL * an async result
*/ int (*sync) (void *object, int seq);
/** * Enumerate the parameters of a device. * * Parameters are identified with an \a id. Some parameters can have * multiple values, see the documentation of the parameter id. * * Parameters can be filtered by passing a non-NULL \a filter. * * The result callback will be called at most \a max times with a * struct spa_result_device_params as the result. * * This function must be called from the main thread. * * \param device a \ref spa_device * \param seq a sequence number to pass to the result function * \param id the param id to enumerate * \param index the index of enumeration, pass 0 for the first item. * \param max the maximum number of items to iterate * \param filter and optional filter to use * \return 0 when there are no more parameters to enumerate * -EINVAL when invalid arguments are given * -ENOENT the parameter \a id is unknown * -ENOTSUP when there are no parameters * implemented on \a device
*/ int (*enum_params) (void *object, int seq,
uint32_t id, uint32_t index, uint32_t max, conststruct spa_pod *filter);
/** * Set the configurable parameter in \a device. * * Usually, \a param will be obtained from enum_params and then * modified but it is also possible to set another spa_pod * as long as its keys and types match a supported object. * * Objects with property keys that are not known are ignored. * * This function must be called from the main thread. * * \param object \ref spa_device * \param id the parameter id to configure * \param flags additional flags * \param param the parameter to configure * * \return 0 on success * -EINVAL when invalid arguments are given * -ENOTSUP when there are no parameters implemented on \a device * -ENOENT the parameter is unknown
*/ int (*set_param) (void *object,
uint32_t id, uint32_t flags, conststruct spa_pod *param);
};
#define SPA_KEY_DEVICE_ENUM_API "device.enum.api"/**< the api used to discover this
* device */ #define SPA_KEY_DEVICE_API "device.api"/**< the api used by the device
* Ex. "udev", "alsa", "v4l2". */ #define SPA_KEY_DEVICE_NAME "device.name"/**< the name of the device */ #define SPA_KEY_DEVICE_ALIAS "device.alias"/**< alternative name of the device */ #define SPA_KEY_DEVICE_NICK "device.nick"/**< the device short name */ #define SPA_KEY_DEVICE_DESCRIPTION "device.description"/**< a device description */ #define SPA_KEY_DEVICE_ICON "device.icon"/**< icon for the device. A base64 blob
* containing PNG image data */ #define SPA_KEY_DEVICE_ICON_NAME "device.icon-name"/**< an XDG icon name for the device.
* Ex. "sound-card-speakers-usb" */ #define SPA_KEY_DEVICE_PLUGGED_USEC "device.plugged.usec"/**< when the device was plugged */
#define SPA_KEY_DEVICE_BUS_ID "device.bus-id"/**< the device bus-id */ #define SPA_KEY_DEVICE_BUS_PATH "device.bus-path"/**< bus path to the device in the OS' * format.
* Ex. "pci-0000:00:14.0-usb-0:3.2:1.0" */ #define SPA_KEY_DEVICE_BUS "device.bus"/**< bus of the device if applicable. One of * "isa", "pci", "usb", "firewire",
* "bluetooth" */ #define SPA_KEY_DEVICE_SUBSYSTEM "device.subsystem"/**< device subsystem */ #define SPA_KEY_DEVICE_SYSFS_PATH "device.sysfs.path"/**< device sysfs path */
#define SPA_KEY_DEVICE_VENDOR_ID "device.vendor.id"/**< vendor ID if applicable */ #define SPA_KEY_DEVICE_VENDOR_NAME "device.vendor.name"/**< vendor name if applicable */ #define SPA_KEY_DEVICE_PRODUCT_ID "device.product.id"/**< product ID if applicable */ #define SPA_KEY_DEVICE_PRODUCT_NAME "device.product.name"/**< product name if applicable */ #define SPA_KEY_DEVICE_SERIAL "device.serial"/**< Serial number if applicable */ #define SPA_KEY_DEVICE_CLASS "device.class"/**< device class */ #define SPA_KEY_DEVICE_CAPABILITIES "device.capabilities"/**< api specific device capabilities */ #define SPA_KEY_DEVICE_FORM_FACTOR "device.form-factor"/**< form factor if applicable. One of * "internal", "speaker", "handset", "tv", * "webcam", "microphone", "headset", * "headphone", "hands-free", "car", "hifi",
* "computer", "portable" */ #define SPA_KEY_DEVICE_PROFILE "device.profile "/**< profile for the device */ #define SPA_KEY_DEVICE_PROFILE_SET "device.profile-set"/**< profile set for the device */ #define SPA_KEY_DEVICE_STRING "device.string"/**< device string in the underlying
* layer's format. E.g. "surround51:0" */
/** * \}
*/
#ifdef __cplusplus
} /* extern "C" */ #endif
#endif/* SPA_DEVICE_H */
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