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props: improve property introspection

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Make a new PropInfo parameter that allows us to iterate all
properties. Make some new fields to set labels and names for
properties. We will be able to add more things to describe the
properties this way.
Use the Props param to simply query or set properties.
We can now make int enum properties and describe all possible
values with labels, we don't need to register types anymore.
This then makes it possible to enumerate the v4l2 controls and make
them available as control params.
This commit is contained in:
Wim Taymans 2017-12-15 16:30:56 +01:00
parent 1c19342487
commit e5e360d5df
13 changed files with 611 additions and 175 deletions
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29
spa/include/spa/param/param.h
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@ -44,6 +44,23 @@ extern "C" {
#define SPA_TYPE_PARAM_LIST_BASE SPA_TYPE_PARAM__List ":"
#define SPA_TYPE_PARAM_LIST__id SPA_TYPE_PARAM_LIST_BASE "id"
/** Enum Property info */
#define SPA_TYPE_PARAM_ID__PropInfo SPA_TYPE_PARAM_ID_BASE "PropInfo"
#define SPA_TYPE_PARAM__PropInfo SPA_TYPE_PARAM_BASE "PropInfo"
#define SPA_TYPE_PARAM_PROP_INFO_BASE SPA_TYPE_PARAM__PropInfo ":"
/** associated id of the property */
#define SPA_TYPE_PARAM_PROP_INFO__id SPA_TYPE_PARAM_PROP_INFO_BASE "id"
/** name of property */
#define SPA_TYPE_PARAM_PROP_INFO__name SPA_TYPE_PARAM_PROP_INFO_BASE "name"
/** associated type and range/enums of property */
#define SPA_TYPE_PARAM_PROP_INFO__type SPA_TYPE_PARAM_PROP_INFO_BASE "type"
/** associated labels of property if any, this is a struct with pairs of values,
* the first one is of the type of the property, the second one is a string with
* a user readable label for the value. */
#define SPA_TYPE_PARAM_PROP_INFO__labels SPA_TYPE_PARAM_PROP_INFO_BASE "labels"
/** Property parameter id, deals with SPA_TYPE__Props */
#define SPA_TYPE_PARAM_ID__Props SPA_TYPE_PARAM_ID_BASE "Props"
@ -73,6 +90,12 @@ struct spa_type_param {
uint32_t idList; /**< id of the list param */
uint32_t List; /**< list object type */
uint32_t listId; /**< id in the list object */
uint32_t idPropInfo; /**< id to enumerate property info */
uint32_t PropInfo; /**< property info object */
uint32_t propId; /**< property id */
uint32_t propName; /**< property name */
uint32_t propType; /**< property type */
uint32_t propLabels; /**< property labels */
uint32_t idProps; /**< id to enumerate properties */
uint32_t idEnumFormat; /**< id to enumerate formats */
uint32_t idFormat; /**< id to get/set format parameter */
@ -88,6 +111,12 @@ spa_type_param_map(struct spa_type_map *map,
type->idList = spa_type_map_get_id(map, SPA_TYPE_PARAM_ID__List);
type->List = spa_type_map_get_id(map, SPA_TYPE_PARAM__List);
type->listId = spa_type_map_get_id(map, SPA_TYPE_PARAM_LIST__id);
type->idPropInfo = spa_type_map_get_id(map, SPA_TYPE_PARAM_ID__PropInfo);
type->PropInfo = spa_type_map_get_id(map, SPA_TYPE_PARAM__PropInfo);
type->propId = spa_type_map_get_id(map, SPA_TYPE_PARAM_PROP_INFO__id);
type->propName = spa_type_map_get_id(map, SPA_TYPE_PARAM_PROP_INFO__name);
type->propType = spa_type_map_get_id(map, SPA_TYPE_PARAM_PROP_INFO__type);
type->propLabels = spa_type_map_get_id(map, SPA_TYPE_PARAM_PROP_INFO__labels);
type->idProps = spa_type_map_get_id(map, SPA_TYPE_PARAM_ID__Props);
type->idEnumFormat = spa_type_map_get_id(map, SPA_TYPE_PARAM_ID__EnumFormat);
type->idFormat = spa_type_map_get_id(map, SPA_TYPE_PARAM_ID__Format);