JACK-AUDIO-CONNECTION-KIT 0.125.0

Functions
the API for starting and controlling a JACK server

## Functions
sigset_t | jackctl_setup_signals (unsigned int flags)
void | jackctl_wait_signals (sigset_t signals)
jackctl_server_t * | jackctl_server_create (bool(*on_device_acquire)(const char *device_name), void(*on_device_release)(const char *device_name))
void | jackctl_server_destroy (jackctl_server_t *server)
bool | jackctl_server_start (jackctl_server_t *server, jackctl_driver_t *driver)
bool | jackctl_server_stop (jackctl_server_t *server)
const JSList * | jackctl_server_get_drivers_list (jackctl_server_t *server)
const JSList * | jackctl_server_get_parameters (jackctl_server_t *server)
const JSList * | jackctl_server_get_internals_list (jackctl_server_t *server)
bool | jackctl_server_load_internal (jackctl_server_t *server, jackctl_internal_t *internal)
bool | jackctl_server_unload_internal (jackctl_server_t *server, jackctl_internal_t *internal)
bool | jackctl_server_add_slave (jackctl_server_t *server, jackctl_driver_t *driver)
bool | jackctl_server_remove_slave (jackctl_server_t *server, jackctl_driver_t *driver)
bool | jackctl_server_switch_master (jackctl_server_t *server, jackctl_driver_t *driver)
const char * | jackctl_driver_get_name (jackctl_driver_t *driver)
const JSList * | jackctl_driver_get_parameters (jackctl_driver_t *driver)
const char * | jackctl_internal_get_name (jackctl_internal_t *internal)
const JSList * | jackctl_internal_get_parameters (jackctl_internal_t *internal)
const char * | jackctl_parameter_get_name (jackctl_parameter_t *parameter)
const char * | jackctl_parameter_get_short_description (jackctl_parameter_t *parameter)
const char * | jackctl_parameter_get_long_description (jackctl_parameter_t *parameter)
jackctl_param_type_t | jackctl_parameter_get_type (jackctl_parameter_t *parameter)
char | jackctl_parameter_get_id (jackctl_parameter_t *parameter)
bool | jackctl_parameter_is_set (jackctl_parameter_t *parameter)
bool | jackctl_parameter_reset (jackctl_parameter_t *parameter)
union jackctl_parameter_value | jackctl_parameter_get_value (jackctl_parameter_t *parameter)
bool | jackctl_parameter_set_value (jackctl_parameter_t *parameter, const union jackctl_parameter_value *value_ptr)
union jackctl_parameter_value | jackctl_parameter_get_default_value (jackctl_parameter_t *parameter)
bool | jackctl_parameter_has_range_constraint (jackctl_parameter_t *parameter)
bool | jackctl_parameter_has_enum_constraint (jackctl_parameter_t *parameter)
uint32_t | jackctl_parameter_get_enum_constraints_count (jackctl_parameter_t *parameter)
union jackctl_parameter_value | jackctl_parameter_get_enum_constraint_value (jackctl_parameter_t *parameter, uint32_t index)
const char * | jackctl_parameter_get_enum_constraint_description (jackctl_parameter_t *parameter, uint32_t index)
void | jackctl_parameter_get_range_constraint (jackctl_parameter_t *parameter, union jackctl_parameter_value *min_ptr, union jackctl_parameter_value *max_ptr)
bool | jackctl_parameter_constraint_is_strict (jackctl_parameter_t *parameter)
bool | jackctl_parameter_constraint_is_fake_value (jackctl_parameter_t *parameter)
void | jack_error (const char *format,...)
void | jack_info (const char *format,...)
void | jack_log (const char *format,...)

## Detailed Description

## Function Documentation

## ◆ jack_error()

void jack_error | ( | const char * | format,
|  |  | ...
| ) |  |

Call this function to log an error message.

Parameters

  format | string

## ◆ jack_info()

void jack_info | ( | const char * | format,
|  |  | ...
| ) |  |

Call this function to log an information message.

Parameters

  format | string

## ◆ jack_log()

void jack_log | ( | const char * | format,
|  |  | ...
| ) |  |

Call this function to log an information message but only when verbose mode is enabled.

Parameters

  format | string

## ◆ jackctl_driver_get_name()

const char* jackctl_driver_get_name | ( | jackctl_driver_t * | driver | ) |

Call this function to get name of driver.

Parameters

  driver | driver object handle to get name of

Returns
  driver name. Must not be modified. Always same for same driver object.

## ◆ jackctl_driver_get_parameters()

const JSList* jackctl_driver_get_parameters | ( | jackctl_driver_t * | driver | ) |

Call this function to get list of driver parameters. List node data pointers is a parameter object handle (jackctl_parameter_t).

Parameters

  driver | driver object handle to get parameters for

Returns
  Single linked list of parameter object handles. Must not be modified. Always same for same driver object.

## ◆ jackctl_internal_get_name()

const char* jackctl_internal_get_name | ( | jackctl_internal_t * | internal | ) |

Call this function to get name of internal client.

Parameters

  internal | internal object handle to get name of

Returns
  internal name. Must not be modified. Always same for same internal object.

## ◆ jackctl_internal_get_parameters()

const JSList* jackctl_internal_get_parameters | ( | jackctl_internal_t * | internal | ) |

Call this function to get list of internal parameters. List node data pointers is a parameter object handle (jackctl_parameter_t).

Parameters

  internal | internal object handle to get parameters for

Returns
  Single linked list of parameter object handles. Must not be modified. Always same for same internal object.

## ◆ jackctl_parameter_constraint_is_fake_value()

bool jackctl_parameter_constraint_is_fake_value | ( | jackctl_parameter_t * | parameter | ) |

Call this function to check whether parameter has fake values, i.e. values have no user meaningful meaning and only value description is meaningful to user.

Parameters

  parameter | parameter object handle to check

Returns
  whether parameter constraint is strict.

## ◆ jackctl_parameter_constraint_is_strict()

bool jackctl_parameter_constraint_is_strict | ( | jackctl_parameter_t * | parameter | ) |

Call this function to check whether parameter constraint is strict, i.e. whether supplying non-matching value will not work for sure.

Parameters

  parameter | parameter object handle to check

Returns
  whether parameter constraint is strict.

## ◆ jackctl_parameter_get_default_value()

union jackctl_parameter_value jackctl_parameter_get_default_value | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter default value.

Parameters

  parameter | parameter object handle to get default value of

Returns
  parameter default value.

## ◆ jackctl_parameter_get_enum_constraint_description()

const char* jackctl_parameter_get_enum_constraint_description | ( | jackctl_parameter_t * | parameter,
|  | uint32_t | index
| ) |  |

Call this function to get parameter enumeration value description.

Parameters

  parameter | object handle of parameter
  index | index of parameter enumeration value

Returns
  enumeration value description.

## ◆ jackctl_parameter_get_enum_constraint_value()

union jackctl_parameter_value jackctl_parameter_get_enum_constraint_value | ( | jackctl_parameter_t * | parameter,
|  | uint32_t | index
| ) |  |

Call this function to get parameter enumeration value.

Parameters

  parameter | object handle of parameter
  index | index of parameter enumeration value

Returns
  enumeration value.

## ◆ jackctl_parameter_get_enum_constraints_count()

uint32_t jackctl_parameter_get_enum_constraints_count | ( | jackctl_parameter_t * | parameter | ) |

Call this function get how many enumeration values parameter has.

Parameters

  parameter | object handle of parameter

Returns
  number of enumeration values

## ◆ jackctl_parameter_get_id()

char jackctl_parameter_get_id | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter character.

Parameters

  parameter | parameter object handle to get character of

Returns
  character.

## ◆ jackctl_parameter_get_long_description()

const char* jackctl_parameter_get_long_description | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter long description.

Parameters

  parameter | parameter object handle to get long description of

Returns
  parameter long description. Must not be modified. Always same for same parameter object.

## ◆ jackctl_parameter_get_name()

const char* jackctl_parameter_get_name | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter name.

Parameters

  parameter | parameter object handle to get name of

Returns
  parameter name. Must not be modified. Always same for same parameter object.

## ◆ jackctl_parameter_get_range_constraint()

void jackctl_parameter_get_range_constraint | ( | jackctl_parameter_t * | parameter,
|  | union jackctl_parameter_value * | min_ptr,
|  | union jackctl_parameter_value * | max_ptr
| ) |  |

Call this function to get parameter range.

Parameters

  parameter | object handle of parameter
  min_ptr | pointer to variable receiving parameter minimum value
  max_ptr | pointer to variable receiving parameter maximum value

## ◆ jackctl_parameter_get_short_description()

const char* jackctl_parameter_get_short_description | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter short description.

Parameters

  parameter | parameter object handle to get short description of

Returns
  parameter short description. Must not be modified. Always same for same parameter object.

## ◆ jackctl_parameter_get_type()

jackctl_param_type_t jackctl_parameter_get_type | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter type.

Parameters

  parameter | parameter object handle to get type of

Returns
  parameter type. Always same for same parameter object.

## ◆ jackctl_parameter_get_value()

union jackctl_parameter_value jackctl_parameter_get_value | ( | jackctl_parameter_t * | parameter | ) |

Call this function to get parameter value.

Parameters

  parameter | parameter object handle to get value of

Returns
  parameter value.

## ◆ jackctl_parameter_has_enum_constraint()

bool jackctl_parameter_has_enum_constraint | ( | jackctl_parameter_t * | parameter | ) |

Call this function check whether parameter has enumeration constraint.

Parameters

  parameter | object handle of parameter to check

Returns
  whether parameter has enumeration constraint.

## ◆ jackctl_parameter_has_range_constraint()

bool jackctl_parameter_has_range_constraint | ( | jackctl_parameter_t * | parameter | ) |

Call this function check whether parameter has range constraint.

Parameters

  parameter | object handle of parameter to check

Returns
  whether parameter has range constraint.

## ◆ jackctl_parameter_is_set()

bool jackctl_parameter_is_set | ( | jackctl_parameter_t * | parameter | ) |

Call this function to check whether parameter has been set, or its default value is being used.

Parameters

  parameter | parameter object handle to check

Returns
  true - parameter is set, false - parameter is using default value.

## ◆ jackctl_parameter_reset()

bool jackctl_parameter_reset | ( | jackctl_parameter_t * | parameter | ) |

Call this function to reset parameter to its default value.

Parameters

  parameter | parameter object handle to reset value of

Returns
  success status: true - success, false - fail

## ◆ jackctl_parameter_set_value()

bool jackctl_parameter_set_value | ( | jackctl_parameter_t * | parameter,
|  | const union jackctl_parameter_value * | value_ptr
| ) |  |

Call this function to set parameter value.

Parameters

  parameter | parameter object handle to get value of
  value_ptr | pointer to variable containing parameter value

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_add_slave()

bool jackctl_server_add_slave | ( | jackctl_server_t * | server,
|  | jackctl_driver_t * | driver
| ) |  |

Call this function to add a slave in the driver slave list.

Parameters

  server | server object handle
  driver | driver to add in the driver slave list.

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_create()

jackctl_server_t* jackctl_server_create | ( | bool(*)(const char *device_name) | on_device_acquire,
|  | void(*)(const char *device_name) | on_device_release
| ) |  |

Call this function to create server object.

Parameters

  on_device_acquire | - Optional callback to be called before device is acquired. If false is returned, device usage will fail
  on_device_release | - Optional callback to be called after device is released.

Returns
  server object handle, NULL if creation of server object failed. Successfully created server object must be destroyed with paired call to jackctl_server_destroy

## ◆ jackctl_server_destroy()

void jackctl_server_destroy | ( | jackctl_server_t * | server | ) |

Call this function to destroy server object.

Parameters

  server | server object handle to destroy

## ◆ jackctl_server_get_drivers_list()

const JSList* jackctl_server_get_drivers_list | ( | jackctl_server_t * | server | ) |

Call this function to get list of available drivers. List node data pointers is a driver object handle (jackctl_driver_t).

Parameters

  server | server object handle to get drivers for

Returns
  Single linked list of driver object handles. Must not be modified. Always same for same server object.

## ◆ jackctl_server_get_internals_list()

const JSList* jackctl_server_get_internals_list | ( | jackctl_server_t * | server | ) |

Call this function to get list of available internal clients. List node data pointers is a internal client object handle (jackctl_internal_t).

Parameters

  server | server object handle to get internal clients for

Returns
  Single linked list of internal client object handles. Must not be modified. Always same for same server object.

## ◆ jackctl_server_get_parameters()

const JSList* jackctl_server_get_parameters | ( | jackctl_server_t * | server | ) |

Call this function to get list of server parameters. List node data pointers is a parameter object handle (jackctl_parameter_t).

Parameters

  server | server object handle to get parameters for

Returns
  Single linked list of parameter object handles. Must not be modified. Always same for same server object.

## ◆ jackctl_server_load_internal()

bool jackctl_server_load_internal | ( | jackctl_server_t * | server,
|  | jackctl_internal_t * | internal
| ) |  |

Call this function to load one internal client.

Parameters

  server | server object handle
  internal | internal to use

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_remove_slave()

bool jackctl_server_remove_slave | ( | jackctl_server_t * | server,
|  | jackctl_driver_t * | driver
| ) |  |

Call this function to remove a slave from the driver slave list.

Parameters

  server | server object handle
  driver | driver to remove from the driver slave list.

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_start()

bool jackctl_server_start | ( | jackctl_server_t * | server,
|  | jackctl_driver_t * | driver
| ) |  |

Call this function to start JACK server

Parameters

  server | server object handle
  driver | driver to use

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_stop()

bool jackctl_server_stop | ( | jackctl_server_t * | server | ) |

Call this function to stop JACK server

Parameters

  server | server object handle

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_switch_master()

bool jackctl_server_switch_master | ( | jackctl_server_t * | server,
|  | jackctl_driver_t * | driver
| ) |  |

Call this function to switch master driver.

Parameters

  server | server object handle
  driver | driver to switch to

Returns
  success status: true - success, false - fail

## ◆ jackctl_server_unload_internal()

bool jackctl_server_unload_internal | ( | jackctl_server_t * | server,
|  | jackctl_internal_t * | internal
| ) |  |

Call this function to unload one internal client.

Parameters

  server | server object handle
  internal | internal to unload

Returns
  success status: true - success, false - fail

## ◆ jackctl_setup_signals()

sigset_t jackctl_setup_signals | ( | unsigned int | flags | ) |

Call this function to setup process signal handling. As a general rule, it is required for proper operation for the server object.

Parameters

  flags | signals setup flags, use 0 for none. Currently no flags are defined

Returns
  the configurated signal set.

## ◆ jackctl_wait_signals()

void jackctl_wait_signals | ( | sigset_t | signals | ) |

Call this function to wait on a signal set.

Parameters

  signals | signals set to wait on