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alsa: implement monitor and device

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This commit is contained in:
Wim Taymans 2018-11-23 17:41:39 +01:00
parent 0a88805743
commit e23c209a5f
11 changed files with 527 additions and 289 deletions
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58
spa/include/spa/monitor/device.h
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@ -34,6 +34,7 @@ struct spa_device;
#include <spa/utils/defs.h>
#include <spa/utils/dict.h>
#include <spa/support/plugin.h>
#include <spa/pod/builder.h>
/**
* spa_device_callbacks:
@ -79,9 +80,64 @@ struct spa_device {
int (*set_callbacks) (struct spa_device *device,
const struct spa_device_callbacks *callbacks,
void *data);
/**
* 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.
*
* This function must be called from the main thread.
*
* \param device a \ref spa_device
* \param id the param id to enumerate
* \param index the index of enumeration, pass 0 for the first item and the
* index is updated to retrieve the next item.
* \param filter and optional filter to use
* \param param result param or NULL
* \param builder builder for the param object.
* \return 1 on success and \a param contains the result
* 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) (struct spa_device *device,
uint32_t id, uint32_t *index,
const struct spa_pod *filter,
struct spa_pod **param,
struct spa_pod_builder *builder);
/**
* 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 device a \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) (struct spa_device *device,
uint32_t id, uint32_t flags,
const struct spa_pod *param);
};
#define spa_device_set_callbacks(m,...) (m)->set_callbacks((m),__VA_ARGS__)
#define spa_device_set_callbacks(d,...) (d)->set_callbacks((d),__VA_ARGS__)
#define spa_device_enum_params(d,...) (d)->enum_params((d),__VA_ARGS__)
#define spa_device_set_param(d,...) (d)->set_param((d),__VA_ARGS__)
#ifdef __cplusplus
} /* extern "C" */