xref: /third_party/pulseaudio/src/pulse/introspect.h

#ifndef foointrospecthfoo
#define foointrospecthfoo

/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering
  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/

#include <inttypes.h>

#include <pulse/operation.h>
#include <pulse/context.h>
#include <pulse/cdecl.h>
#include <pulse/gccmacro.h>
#include <pulse/channelmap.h>
#include <pulse/volume.h>
#include <pulse/proplist.h>
#include <pulse/format.h>
#include <pulse/version.h>

/** \page introspect Server Query and Control
 *
 * \section overv_sec Overview
 *
 * Sometimes it is necessary to query and modify global settings in the
 * server. For this, PulseAudio has the introspection API. It can list sinks,
 * sources, samples and other aspects of the server. It can also modify the
 * attributes of the server that will affect operations on a global level,
 * and not just the application's context.
 *
 * \section query_sec Querying
 *
 * All querying is done through callbacks. This approach is necessary to
 * maintain an asynchronous design. The client will request the information
 * and some time later, the server will respond with the desired data.
 *
 * Some objects can have multiple instances on the server. When requesting all
 * of these at once, the callback will be called multiple times, once for
 * each object. When the list has been exhausted, the callback will be called
 * without an information structure and the eol parameter set to a positive
 * value.
 *
 * Note that even if a single object is requested, and not the entire list,
 * the terminating call will still be made.
 *
 * If an error occurs, the callback will be invoked without an information
 * structure and eol set to a negative value..
 *
 * Data members in the information structures are only valid during the
 * duration of the callback. If they are required after the callback is
 * finished, a deep copy of the information structure must be performed.
 *
 * \subsection server_subsec Server Information
 *
 * The server can be queried about its name, the environment it's running on
 * and the currently active global defaults. Calling
 * pa_context_get_server_info() provides access to a pa_server_info structure
 * containing all of these.
 *
 * \subsection memstat_subsec Memory Usage
 *
 * Statistics about memory usage can be fetched using pa_context_stat(),
 * giving a pa_stat_info structure.
 *
 * \subsection sinksrc_subsec Sinks and Sources
 *
 * The server can have an arbitrary number of sinks and sources. Each sink
 * and source have both an index and a name associated with it. As such,
 * there are three ways to get access to them:
 *
 * \li By index - pa_context_get_sink_info_by_index() /
 *                pa_context_get_source_info_by_index()
 * \li By name - pa_context_get_sink_info_by_name() /
 *               pa_context_get_source_info_by_name()
 * \li All - pa_context_get_sink_info_list() /
 *           pa_context_get_source_info_list()
 *
 * All three method use the same callback and will provide a pa_sink_info or
 * pa_source_info structure.
 *
 * \subsection siso_subsec Sink Inputs and Source Outputs
 *
 * Sink inputs and source outputs are the representations of the client ends
 * of streams inside the server. I.e. they connect a client stream to one of
 * the global sinks or sources.
 *
 * Sink inputs and source outputs only have an index to identify them. As
 * such, there are only two ways to get information about them:
 *
 * \li By index - pa_context_get_sink_input_info() /
 *                pa_context_get_source_output_info()
 * \li All - pa_context_get_sink_input_info_list() /
 *           pa_context_get_source_output_info_list()
 *
 * The structure returned is the pa_sink_input_info or pa_source_output_info
 * structure.
 *
 * \subsection samples_subsec Samples
 *
 * The list of cached samples can be retrieved from the server. Three methods
 * exist for querying the sample cache list:
 *
 * \li By index - pa_context_get_sample_info_by_index()
 * \li By name - pa_context_get_sample_info_by_name()
 * \li All - pa_context_get_sample_info_list()
 *
 * Note that this only retrieves information about the sample, not the sample
 * data itself.
 *
 * \subsection module_subsec Driver Modules
 *
 * PulseAudio driver modules are identified by index and are retrieved using either
 * pa_context_get_module_info() or pa_context_get_module_info_list(). The
 * information structure is called pa_module_info.
 *
 * \subsection client_subsec Clients
 *
 * PulseAudio clients are also identified by index and are retrieved using
 * either pa_context_get_client_info() or pa_context_get_client_info_list().
 * The information structure is called pa_client_info.
 *
 * \section ctrl_sec Control
 *
 * Some parts of the server are only possible to read, but most can also be
 * modified in different ways. Note that these changes will affect all
 * connected clients and not just the one issuing the request.
 *
 * \subsection sinksrc_subsec Sinks and Sources
 *
 * The most common change one would want to apply to sinks and sources is to
 * modify the volume of the audio. Identically to how sinks and sources can
 * be queried, there are two ways of identifying them:
 *
 * \li By index - pa_context_set_sink_volume_by_index() /
 *                pa_context_set_source_volume_by_index()
 * \li By name - pa_context_set_sink_volume_by_name() /
 *               pa_context_set_source_volume_by_name()
 *
 * It is also possible to mute a sink or source:
 *
 * \li By index - pa_context_set_sink_mute_by_index() /
 *                pa_context_set_source_mute_by_index()
 * \li By name - pa_context_set_sink_mute_by_name() /
 *               pa_context_set_source_mute_by_name()
 *
 * \subsection siso_subsec Sink Inputs and Source Outputs
 *
 * If an application desires to modify the volume of just a single stream
 * (commonly one of its own streams), this can be done by setting the volume
 * of its associated sink input or source output, using
 * pa_context_set_sink_input_volume() or pa_context_set_source_output_volume().
 *
 * It is also possible to remove sink inputs and source outputs, terminating
 * the streams associated with them:
 *
 * \li Sink input - pa_context_kill_sink_input()
 * \li Source output - pa_context_kill_source_output()
 *
 * It is strongly recommended that all volume changes are done as a direct
 * result of user input. With automated requests, such as those resulting
 * from misguided attempts of crossfading, PulseAudio can store the stream
 * volume at an inappropriate moment and restore it later. Besides, such
 * attempts lead to OSD popups in some desktop environments.
 *
 * As a special case of the general rule above, it is recommended that your
 * application leaves the task of saving and restoring the volume of its
 * streams to PulseAudio and does not attempt to do it by itself. PulseAudio
 * really knows better about events such as stream moving or headphone
 * plugging that would make the volume stored by the application inapplicable
 * to the new configuration.
 *
 * Another important case where setting a sink input volume may be a bad idea
 * is related to interpreters that interpret potentially untrusted scripts.
 * PulseAudio relies on your application not making malicious requests (such
 * as repeatedly setting the volume to 100%). Thus, script interpreters that
 * represent a security boundary must sandbox volume-changing requests coming
 * from their scripts. In the worst case, it may be necessary to apply the
 * script-requested volume to the script-produced sounds by altering the
 * samples in the script interpreter and not touching the sink or sink input
 * volume as seen by PulseAudio.
 *
 * If an application changes any volume, it should also listen to changes of
 * the same volume originating from outside the application (e.g., from the
 * system mixer application) and update its user interface accordingly. Use
 * \ref subscribe to get such notifications.
 *
 * \subsection module_subsec Modules
 *
 * Server modules can be remotely loaded and unloaded using
 * pa_context_load_module() and pa_context_unload_module().
 *
 * \subsection message_subsec Messages
 *
 * Server objects like sinks, sink inputs or modules can register a message
 * handler to communicate with clients. A message can be sent to a named
 * message handler using pa_context_send_message_to_object().
 *
 * \subsection client_subsec Clients
 *
 * The only operation supported on clients is the possibility of kicking
 * them off the server using pa_context_kill_client().
 */

/** \file
 *
 * Routines for daemon introspection.
 *
 * See also \subpage introspect
 */

PA_C_DECL_BEGIN

/** @{ \name Sinks */

/** Stores information about a specific port of a sink.  Please
 * note that this structure can be extended as part of evolutionary
 * API updates at any time in any new release. \since 0.9.16 */
typedef struct pa_sink_port_info {
    const char *name;                   /**< Name of this port */
    const char *description;            /**< Description of this port */
    uint32_t priority;                  /**< The higher this value is, the more useful this port is as a default. */
    int available;                      /**< A flags (see #pa_port_available), indicating availability status of this port. \since 2.0 */
    const char *availability_group;     /**< An indentifier for the group of ports that share their availability status with
                                         * each other. This is meant especially for handling cases where one 3.5 mm connector
                                         * is used for headphones, headsets and microphones, and the hardware can only tell
                                         * that something was plugged in but not what exactly. In this situation the ports for
                                         * all those devices share their availability status, and PulseAudio can't tell which
                                         * one is actually plugged in, and some application may ask the user what was plugged
                                         * in. Such applications should get a list of all card ports and compare their
                                         * `availability_group` fields. Ports that have the same group are those that need
                                         * input from the user to determine which device was plugged in. The application should
                                         * then activate the user-chosen port.
                                         *
                                         * May be NULL, in which case the port is not part of any availability group.
                                         *
                                         * The group identifier must be treated as an opaque identifier. The string may look
                                         * like an ALSA control name, but applications must not assume any such relationship.
                                         * The group naming scheme can change without a warning.
                                         *
                                         * Since one group can include both input and output ports, the grouping should be done
                                         * using pa_card_port_info instead of pa_sink_port_info, but this field is duplicated
                                         * also in pa_sink_port_info (and pa_source_port_info) in case someone finds that
                                         * convenient.
                                         *
                                         * \since 14.0 */
    uint32_t type;			/**< Port type, see #pa_device_port_type. \since 14.0 */
} pa_sink_port_info;

/** Stores information about sinks. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_sink_info {
    const char *name;                  /**< Name of the sink */
    uint32_t index;                    /**< Index of the sink */
    const char *description;           /**< Description of this sink */
    pa_sample_spec sample_spec;        /**< Sample spec of this sink */
    pa_channel_map channel_map;        /**< Channel map */
    uint32_t owner_module;             /**< Index of the owning module of this sink, or PA_INVALID_INDEX. */
    pa_cvolume volume;                 /**< Volume of the sink */
    int mute;                          /**< Mute switch of the sink */
    uint32_t monitor_source;           /**< Index of the monitor source connected to this sink. */
    const char *monitor_source_name;   /**< The name of the monitor source. */
    pa_usec_t latency;                 /**< Length of queued audio in the output buffer. */
    const char *driver;                /**< Driver name */
    pa_sink_flags_t flags;             /**< Flags */
    pa_proplist *proplist;             /**< Property list \since 0.9.11 */
    pa_usec_t configured_latency;      /**< The latency this device has been configured to. \since 0.9.11 */
    pa_volume_t base_volume;           /**< Some kind of "base" volume that refers to unamplified/unattenuated volume in the context of the output device. \since 0.9.15 */
    pa_sink_state_t state;             /**< State \since 0.9.15 */
    uint32_t n_volume_steps;           /**< Number of volume steps for sinks which do not support arbitrary volumes. \since 0.9.15 */
    uint32_t card;                     /**< Card index, or PA_INVALID_INDEX. \since 0.9.15 */
    uint32_t n_ports;                  /**< Number of entries in port array \since 0.9.16 */
    pa_sink_port_info** ports;         /**< Array of available ports, or NULL. Array is terminated by an entry set to NULL. The number of entries is stored in n_ports. \since 0.9.16 */
    pa_sink_port_info* active_port;    /**< Pointer to active port in the array, or NULL. \since 0.9.16 */
    uint8_t n_formats;                 /**< Number of formats supported by the sink. \since 1.0 */
    pa_format_info **formats;          /**< Array of formats supported by the sink. \since 1.0 */
} pa_sink_info;

/** Callback prototype for pa_context_get_sink_info_by_name() and friends */
typedef void (*pa_sink_info_cb_t)(pa_context *c, const pa_sink_info *i, int eol, void *userdata);

/** Get information about a sink by its name */
pa_operation* pa_context_get_sink_info_by_name(pa_context *c, const char *name, pa_sink_info_cb_t cb, void *userdata);

/** Get information about a sink by its index */
pa_operation* pa_context_get_sink_info_by_index(pa_context *c, uint32_t idx, pa_sink_info_cb_t cb, void *userdata);

/** Get the complete sink list */
pa_operation* pa_context_get_sink_info_list(pa_context *c, pa_sink_info_cb_t cb, void *userdata);

/** Set the volume of a sink device specified by its index */
pa_operation* pa_context_set_sink_volume_by_index(pa_context *c, uint32_t idx, const pa_cvolume *volume, pa_context_success_cb_t cb, void *userdata);

/** Set the volume of a sink device specified by its name */
pa_operation* pa_context_set_sink_volume_by_name(pa_context *c, const char *name, const pa_cvolume *volume, pa_context_success_cb_t cb, void *userdata);

/** Set the mute switch of a sink device specified by its index */
pa_operation* pa_context_set_sink_mute_by_index(pa_context *c, uint32_t idx, int mute, pa_context_success_cb_t cb, void *userdata);

/** Set the mute switch of a sink device specified by its name */
pa_operation* pa_context_set_sink_mute_by_name(pa_context *c, const char *name, int mute, pa_context_success_cb_t cb, void *userdata);

/** Suspend/Resume a sink. \since 0.9.7 */
pa_operation* pa_context_suspend_sink_by_name(pa_context *c, const char *sink_name, int suspend, pa_context_success_cb_t cb, void* userdata);

/** Suspend/Resume a sink. If idx is PA_INVALID_INDEX all sinks will be suspended. \since 0.9.7 */
pa_operation* pa_context_suspend_sink_by_index(pa_context *c, uint32_t idx, int suspend,  pa_context_success_cb_t cb, void* userdata);

/** Change the profile of a sink. \since 0.9.16 */
pa_operation* pa_context_set_sink_port_by_index(pa_context *c, uint32_t idx, const char*port, pa_context_success_cb_t cb, void *userdata);

/** Change the profile of a sink. \since 0.9.15 */
pa_operation* pa_context_set_sink_port_by_name(pa_context *c, const char*name, const char*port, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Sources */

/** Stores information about a specific port of a source.  Please
 * note that this structure can be extended as part of evolutionary
 * API updates at any time in any new release. \since 0.9.16 */
typedef struct pa_source_port_info {
    const char *name;                   /**< Name of this port */
    const char *description;            /**< Description of this port */
    uint32_t priority;                  /**< The higher this value is, the more useful this port is as a default. */
    int available;                      /**< A flags (see #pa_port_available), indicating availability status of this port. \since 2.0 */
    const char *availability_group;     /**< An indentifier for the group of ports that share their availability status with
                                         * each other. This is meant especially for handling cases where one 3.5 mm connector
                                         * is used for headphones, headsets and microphones, and the hardware can only tell
                                         * that something was plugged in but not what exactly. In this situation the ports for
                                         * all those devices share their availability status, and PulseAudio can't tell which
                                         * one is actually plugged in, and some application may ask the user what was plugged
                                         * in. Such applications should get a list of all card ports and compare their
                                         * `availability_group` fields. Ports that have the same group are those that need
                                         * input from the user to determine which device was plugged in. The application should
                                         * then activate the user-chosen port.
                                         *
                                         * May be NULL, in which case the port is not part of any availability group (which is
                                         * the same as having a group with only one member).
                                         *
                                         * The group identifier must be treated as an opaque identifier. The string may look
                                         * like an ALSA control name, but applications must not assume any such relationship.
                                         * The group naming scheme can change without a warning.
                                         *
                                         * Since one group can include both input and output ports, the grouping should be done
                                         * using pa_card_port_info instead of pa_source_port_info, but this field is duplicated
                                         * also in pa_source_port_info (and pa_sink_port_info) in case someone finds that
                                         * convenient.
                                         *
                                         * \since 14.0 */
    uint32_t type;		        /**< Port type, see #pa_device_port_type. \since 14.0 */
} pa_source_port_info;

/** Stores information about sources. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_source_info {
    const char *name;                   /**< Name of the source */
    uint32_t index;                     /**< Index of the source */
    const char *description;            /**< Description of this source */
    pa_sample_spec sample_spec;         /**< Sample spec of this source */
    pa_channel_map channel_map;         /**< Channel map */
    uint32_t owner_module;              /**< Owning module index, or PA_INVALID_INDEX. */
    pa_cvolume volume;                  /**< Volume of the source */
    int mute;                           /**< Mute switch of the sink */
    uint32_t monitor_of_sink;           /**< If this is a monitor source, the index of the owning sink, otherwise PA_INVALID_INDEX. */
    const char *monitor_of_sink_name;   /**< Name of the owning sink, or NULL. */
    pa_usec_t latency;                  /**< Length of filled record buffer of this source. */
    const char *driver;                 /**< Driver name */
    pa_source_flags_t flags;            /**< Flags */
    pa_proplist *proplist;              /**< Property list \since 0.9.11 */
    pa_usec_t configured_latency;       /**< The latency this device has been configured to. \since 0.9.11 */
    pa_volume_t base_volume;            /**< Some kind of "base" volume that refers to unamplified/unattenuated volume in the context of the input device. \since 0.9.15 */
    pa_source_state_t state;            /**< State \since 0.9.15 */
    uint32_t n_volume_steps;            /**< Number of volume steps for sources which do not support arbitrary volumes. \since 0.9.15 */
    uint32_t card;                      /**< Card index, or PA_INVALID_INDEX. \since 0.9.15 */
    uint32_t n_ports;                   /**< Number of entries in port array \since 0.9.16 */
    pa_source_port_info** ports;        /**< Array of available ports, or NULL. Array is terminated by an entry set to NULL. The number of entries is stored in n_ports. \since 0.9.16  */
    pa_source_port_info* active_port;   /**< Pointer to active port in the array, or NULL. \since 0.9.16  */
    uint8_t n_formats;                  /**< Number of formats supported by the source. \since 1.0 */
    pa_format_info **formats;           /**< Array of formats supported by the source. \since 1.0 */
} pa_source_info;

/** Callback prototype for pa_context_get_source_info_by_name() and friends */
typedef void (*pa_source_info_cb_t)(pa_context *c, const pa_source_info *i, int eol, void *userdata);

/** Get information about a source by its name */
pa_operation* pa_context_get_source_info_by_name(pa_context *c, const char *name, pa_source_info_cb_t cb, void *userdata);

/** Get information about a source by its index */
pa_operation* pa_context_get_source_info_by_index(pa_context *c, uint32_t idx, pa_source_info_cb_t cb, void *userdata);

/** Get the complete source list */
pa_operation* pa_context_get_source_info_list(pa_context *c, pa_source_info_cb_t cb, void *userdata);

/** Set the volume of a source device specified by its index */
pa_operation* pa_context_set_source_volume_by_index(pa_context *c, uint32_t idx, const pa_cvolume *volume, pa_context_success_cb_t cb, void *userdata);

/** Set the volume of a source device specified by its name */
pa_operation* pa_context_set_source_volume_by_name(pa_context *c, const char *name, const pa_cvolume *volume, pa_context_success_cb_t cb, void *userdata);

/** Set the mute switch of a source device specified by its index */
pa_operation* pa_context_set_source_mute_by_index(pa_context *c, uint32_t idx, int mute, pa_context_success_cb_t cb, void *userdata);

/** Set the mute switch of a source device specified by its name */
pa_operation* pa_context_set_source_mute_by_name(pa_context *c, const char *name, int mute, pa_context_success_cb_t cb, void *userdata);

/** Suspend/Resume a source. \since 0.9.7 */
pa_operation* pa_context_suspend_source_by_name(pa_context *c, const char *source_name, int suspend, pa_context_success_cb_t cb, void* userdata);

/** Suspend/Resume a source. If idx is PA_INVALID_INDEX, all sources will be suspended. \since 0.9.7 */
pa_operation* pa_context_suspend_source_by_index(pa_context *c, uint32_t idx, int suspend, pa_context_success_cb_t cb, void* userdata);

/** Change the profile of a source. \since 0.9.16 */
pa_operation* pa_context_set_source_port_by_index(pa_context *c, uint32_t idx, const char*port, pa_context_success_cb_t cb, void *userdata);

/** Change the profile of a source. \since 0.9.15 */
pa_operation* pa_context_set_source_port_by_name(pa_context *c, const char*name, const char*port, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Server */

/** Server information. Please note that this structure can be
 * extended as part of evolutionary API updates at any time in any new
 * release. */
typedef struct pa_server_info {
    const char *user_name;              /**< User name of the daemon process */
    const char *host_name;              /**< Host name the daemon is running on */
    const char *server_version;         /**< Version string of the daemon */
    const char *server_name;            /**< Server package name (usually "pulseaudio") */
    pa_sample_spec sample_spec;         /**< Default sample specification */
    const char *default_sink_name;      /**< Name of default sink. */
    const char *default_source_name;    /**< Name of default source. */
    uint32_t cookie;                    /**< A random cookie for identifying this instance of PulseAudio. */
    pa_channel_map channel_map;         /**< Default channel map. \since 0.9.15 */
} pa_server_info;

/** Callback prototype for pa_context_get_server_info() */
typedef void (*pa_server_info_cb_t) (pa_context *c, const pa_server_info*i, void *userdata);

/** Get some information about the server */
pa_operation* pa_context_get_server_info(pa_context *c, pa_server_info_cb_t cb, void *userdata);

/** @} */

/** @{ \name Modules */

/** Stores information about modules. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_module_info {
    uint32_t index;                     /**< Index of the module */
    const char*name,                    /**< Name of the module */
        *argument;                      /**< Argument string of the module */
    uint32_t n_used;                    /**< Usage counter or PA_INVALID_INDEX */
/** \cond fulldocs */
    int auto_unload;                    /**< \deprecated Non-zero if this is an autoloaded module. */
/** \endcond */
    pa_proplist *proplist;              /**< Property list \since 0.9.15 */
} pa_module_info;

/** Callback prototype for pa_context_get_module_info() and friends */
typedef void (*pa_module_info_cb_t) (pa_context *c, const pa_module_info*i, int eol, void *userdata);

/** Get some information about a module by its index */
pa_operation* pa_context_get_module_info(pa_context *c, uint32_t idx, pa_module_info_cb_t cb, void *userdata);

/** Get the complete list of currently loaded modules */
pa_operation* pa_context_get_module_info_list(pa_context *c, pa_module_info_cb_t cb, void *userdata);

/** Callback prototype for pa_context_load_module() */
typedef void (*pa_context_index_cb_t)(pa_context *c, uint32_t idx, void *userdata);

/** Load a module. */
pa_operation* pa_context_load_module(pa_context *c, const char*name, const char *argument, pa_context_index_cb_t cb, void *userdata);

/** Unload a module. */
pa_operation* pa_context_unload_module(pa_context *c, uint32_t idx, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Messages */

/** Callback prototype for pa_context_send_message_to_object() \since 15.0 */
typedef void (*pa_context_string_cb_t)(pa_context *c, int success, char *response, void *userdata);

/** Send a message to an object that registered a message handler. For more information
 * see https://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/doc/messaging_api.txt. \since 15.0 */
pa_operation* pa_context_send_message_to_object(pa_context *c, const char *recipient_name, const char *message, const char *message_parameters, pa_context_string_cb_t cb, void *userdata);

/** @} */

/** @{ \name Clients */

/** Stores information about clients. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_client_info {
    uint32_t index;                      /**< Index of this client */
    const char *name;                    /**< Name of this client */
    uint32_t owner_module;               /**< Index of the owning module, or PA_INVALID_INDEX. */
    const char *driver;                  /**< Driver name */
    pa_proplist *proplist;               /**< Property list \since 0.9.11 */
} pa_client_info;

/** Callback prototype for pa_context_get_client_info() and friends */
typedef void (*pa_client_info_cb_t) (pa_context *c, const pa_client_info*i, int eol, void *userdata);

/** Get information about a client by its index */
pa_operation* pa_context_get_client_info(pa_context *c, uint32_t idx, pa_client_info_cb_t cb, void *userdata);

/** Get the complete client list */
pa_operation* pa_context_get_client_info_list(pa_context *c, pa_client_info_cb_t cb, void *userdata);

/** Kill a client. */
pa_operation* pa_context_kill_client(pa_context *c, uint32_t idx, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Cards */

/** \deprecated Superseded by pa_card_profile_info2 \since 0.9.15 */
typedef struct pa_card_profile_info {
    const char *name;                   /**< Name of this profile */
    const char *description;            /**< Description of this profile */
    uint32_t n_sinks;                   /**< Number of sinks this profile would create */
    uint32_t n_sources;                 /**< Number of sources this profile would create */
    uint32_t priority;                  /**< The higher this value is, the more useful this profile is as a default. */
} pa_card_profile_info;

/** Stores information about a specific profile of a card. Please
 * note that this structure can be extended as part of evolutionary
 * API updates at any time in any new release. \since 5.0 */
typedef struct pa_card_profile_info2 {
    const char *name;                   /**< Name of this profile */
    const char *description;            /**< Description of this profile */
    uint32_t n_sinks;                   /**< Number of sinks this profile would create */
    uint32_t n_sources;                 /**< Number of sources this profile would create */
    uint32_t priority;                  /**< The higher this value is, the more useful this profile is as a default. */
    int available;
    /**< Is this profile available? If this is zero, meaning "unavailable",
     * then it makes no sense to try to activate this profile. If this is
     * non-zero, it's still not a guarantee that activating the profile will
     * result in anything useful, it just means that the server isn't aware of
     * any reason why the profile would definitely be useless. \since 5.0 */
} pa_card_profile_info2;

/** Stores information about a specific port of a card.  Please
 * note that this structure can be extended as part of evolutionary
 * API updates at any time in any new release. \since 2.0 */
typedef struct pa_card_port_info {
    const char *name;                   /**< Name of this port */
    const char *description;            /**< Description of this port */
    uint32_t priority;                  /**< The higher this value is, the more useful this port is as a default. */
    int available;                      /**< A #pa_port_available enum, indicating availability status of this port. */
    int direction;                      /**< A #pa_direction enum, indicating the direction of this port. */
    uint32_t n_profiles;                /**< Number of entries in profile array */
    pa_card_profile_info** profiles;    /**< \deprecated Superseded by profiles2 */
    pa_proplist *proplist;              /**< Property list */
    int64_t latency_offset;             /**< Latency offset of the port that gets added to the sink/source latency when the port is active. \since 3.0 */
    pa_card_profile_info2** profiles2;  /**< Array of pointers to available profiles, or NULL. Array is terminated by an entry set to NULL. \since 5.0 */
    const char *availability_group;     /**< An indentifier for the group of ports that share their availability status with
                                         * each other. This is meant especially for handling cases where one 3.5 mm connector
                                         * is used for headphones, headsets and microphones, and the hardware can only tell
                                         * that something was plugged in but not what exactly. In this situation the ports for
                                         * all those devices share their availability status, and PulseAudio can't tell which
                                         * one is actually plugged in, and some application may ask the user what was plugged
                                         * in. Such applications should get a list of all card ports and compare their
                                         * `availability_group` fields. Ports that have the same group are those that need
                                         * input from the user to determine which device was plugged in. The application should
                                         * then activate the user-chosen port.
                                         *
                                         * May be NULL, in which case the port is not part of any availability group (which is
                                         * the same as having a group with only one member).
                                         *
                                         * The group identifier must be treated as an opaque identifier. The string may look
                                         * like an ALSA control name, but applications must not assume any such relationship.
                                         * The group naming scheme can change without a warning.
                                         *
                                         * \since 14.0 */
    uint32_t type;			/**< Port type, see #pa_device_port_type. \since 14.0 */
} pa_card_port_info;

/** Stores information about cards. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release.  \since 0.9.15 */
typedef struct pa_card_info {
    uint32_t index;                      /**< Index of this card */
    const char *name;                    /**< Name of this card */
    uint32_t owner_module;               /**< Index of the owning module, or PA_INVALID_INDEX. */
    const char *driver;                  /**< Driver name */
    uint32_t n_profiles;                 /**< Number of entries in profile array */
    pa_card_profile_info* profiles;      /**< \deprecated Superseded by profiles2 */
    pa_card_profile_info* active_profile; /**< \deprecated Superseded by active_profile2 */
    pa_proplist *proplist;               /**< Property list */
    uint32_t n_ports;                    /**< Number of entries in port array */
    pa_card_port_info **ports;           /**< Array of pointers to ports, or NULL. Array is terminated by an entry set to NULL. */
    pa_card_profile_info2** profiles2;    /**< Array of pointers to available profiles, or NULL. Array is terminated by an entry set to NULL. \since 5.0 */
    pa_card_profile_info2* active_profile2; /**< Pointer to active profile in the array, or NULL. \since 5.0 */
} pa_card_info;

/** Callback prototype for pa_context_get_card_info_...() \since 0.9.15 */
typedef void (*pa_card_info_cb_t) (pa_context *c, const pa_card_info*i, int eol, void *userdata);

/** Get information about a card by its index \since 0.9.15 */
pa_operation* pa_context_get_card_info_by_index(pa_context *c, uint32_t idx, pa_card_info_cb_t cb, void *userdata);

/** Get information about a card by its name \since 0.9.15 */
pa_operation* pa_context_get_card_info_by_name(pa_context *c, const char *name, pa_card_info_cb_t cb, void *userdata);

/** Get the complete card list \since 0.9.15 */
pa_operation* pa_context_get_card_info_list(pa_context *c, pa_card_info_cb_t cb, void *userdata);

/** Change the profile of a card. \since 0.9.15 */
pa_operation* pa_context_set_card_profile_by_index(pa_context *c, uint32_t idx, const char*profile, pa_context_success_cb_t cb, void *userdata);

/** Change the profile of a card. \since 0.9.15 */
pa_operation* pa_context_set_card_profile_by_name(pa_context *c, const char*name, const char*profile, pa_context_success_cb_t cb, void *userdata);

/** Set the latency offset of a port. \since 3.0 */
pa_operation* pa_context_set_port_latency_offset(pa_context *c, const char *card_name, const char *port_name, int64_t offset, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Sink Inputs */

/** Stores information about sink inputs. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_sink_input_info {
    uint32_t index;                      /**< Index of the sink input */
    const char *name;                    /**< Name of the sink input */
    uint32_t owner_module;               /**< Index of the module this sink input belongs to, or PA_INVALID_INDEX when it does not belong to any module. */
    uint32_t client;                     /**< Index of the client this sink input belongs to, or PA_INVALID_INDEX when it does not belong to any client. */
    uint32_t sink;                       /**< Index of the connected sink */
    pa_sample_spec sample_spec;          /**< The sample specification of the sink input. */
    pa_channel_map channel_map;          /**< Channel map */
    pa_cvolume volume;                   /**< The volume of this sink input. */
    pa_usec_t buffer_usec;               /**< Latency due to buffering in sink input, see pa_timing_info for details. */
    pa_usec_t sink_usec;                 /**< Latency of the sink device, see pa_timing_info for details. */
    const char *resample_method;         /**< The resampling method used by this sink input. */
    const char *driver;                  /**< Driver name */
    int mute;                            /**< Stream muted \since 0.9.7 */
    pa_proplist *proplist;               /**< Property list \since 0.9.11 */
    int corked;                          /**< Stream corked \since 1.0 */
    int has_volume;                      /**< Stream has volume. If not set, then the meaning of this struct's volume member is unspecified. \since 1.0 */
    int volume_writable;                 /**< The volume can be set. If not set, the volume can still change even though clients can't control the volume. \since 1.0 */
    pa_format_info *format;              /**< Stream format information. \since 1.0 */
} pa_sink_input_info;

/** Callback prototype for pa_context_get_sink_input_info() and friends */
typedef void (*pa_sink_input_info_cb_t) (pa_context *c, const pa_sink_input_info *i, int eol, void *userdata);

/** Get some information about a sink input by its index */
pa_operation* pa_context_get_sink_input_info(pa_context *c, uint32_t idx, pa_sink_input_info_cb_t cb, void *userdata);

/** Get the complete sink input list */
pa_operation* pa_context_get_sink_input_info_list(pa_context *c, pa_sink_input_info_cb_t cb, void *userdata);

/** Move the specified sink input to a different sink. \since 0.9.5 */
pa_operation* pa_context_move_sink_input_by_name(pa_context *c, uint32_t idx, const char *sink_name, pa_context_success_cb_t cb, void* userdata);

/** Move the specified sink input to a different sink. \since 0.9.5 */
pa_operation* pa_context_move_sink_input_by_index(pa_context *c, uint32_t idx, uint32_t sink_idx, pa_context_success_cb_t cb, void* userdata);

/** Set the volume of a sink input stream */
pa_operation* pa_context_set_sink_input_volume(pa_context *c, uint32_t idx, const pa_cvolume *volume, pa_context_success_cb_t cb, void *userdata);

/** Set the mute switch of a sink input stream \since 0.9.7 */
pa_operation* pa_context_set_sink_input_mute(pa_context *c, uint32_t idx, int mute, pa_context_success_cb_t cb, void *userdata);

/** Kill a sink input. */
pa_operation* pa_context_kill_sink_input(pa_context *c, uint32_t idx, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Source Outputs */

/** Stores information about source outputs. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_source_output_info {
    uint32_t index;                      /**< Index of the source output */
    const char *name;                    /**< Name of the source output */
    uint32_t owner_module;               /**< Index of the module this source output belongs to, or PA_INVALID_INDEX when it does not belong to any module. */
    uint32_t client;                     /**< Index of the client this source output belongs to, or PA_INVALID_INDEX when it does not belong to any client. */
    uint32_t source;                     /**< Index of the connected source */
    pa_sample_spec sample_spec;          /**< The sample specification of the source output */
    pa_channel_map channel_map;          /**< Channel map */
    pa_usec_t buffer_usec;               /**< Latency due to buffering in the source output, see pa_timing_info for details. */
    pa_usec_t source_usec;               /**< Latency of the source device, see pa_timing_info for details. */
    const char *resample_method;         /**< The resampling method used by this source output. */
    const char *driver;                  /**< Driver name */
    pa_proplist *proplist;               /**< Property list \since 0.9.11 */
    int corked;                          /**< Stream corked \since 1.0 */
    pa_cvolume volume;                   /**< The volume of this source output \since 1.0 */
    int mute;                            /**< Stream muted \since 1.0 */
    int has_volume;                      /**< Stream has volume. If not set, then the meaning of this struct's volume member is unspecified. \since 1.0 */
    int volume_writable;                 /**< The volume can be set. If not set, the volume can still change even though clients can't control the volume. \since 1.0 */
    pa_format_info *format;              /**< Stream format information. \since 1.0 */
} pa_source_output_info;

/** Callback prototype for pa_context_get_source_output_info() and friends */
typedef void (*pa_source_output_info_cb_t) (pa_context *c, const pa_source_output_info *i, int eol, void *userdata);

/** Get information about a source output by its index */
pa_operation* pa_context_get_source_output_info(pa_context *c, uint32_t idx, pa_source_output_info_cb_t cb, void *userdata);

/** Get the complete list of source outputs */
pa_operation* pa_context_get_source_output_info_list(pa_context *c, pa_source_output_info_cb_t cb, void *userdata);

/** Move the specified source output to a different source. \since 0.9.5 */
pa_operation* pa_context_move_source_output_by_name(pa_context *c, uint32_t idx, const char *source_name, pa_context_success_cb_t cb, void* userdata);

/** Move the specified source output to a different source. \since 0.9.5 */
pa_operation* pa_context_move_source_output_by_index(pa_context *c, uint32_t idx, uint32_t source_idx, pa_context_success_cb_t cb, void* userdata);

/** Set the volume of a source output stream \since 1.0 */
pa_operation* pa_context_set_source_output_volume(pa_context *c, uint32_t idx, const pa_cvolume *volume, pa_context_success_cb_t cb, void *userdata);

/** Set the mute switch of a source output stream \since 1.0 */
pa_operation* pa_context_set_source_output_mute(pa_context *c, uint32_t idx, int mute, pa_context_success_cb_t cb, void *userdata);

/** Kill a source output. */
pa_operation* pa_context_kill_source_output(pa_context *c, uint32_t idx, pa_context_success_cb_t cb, void *userdata);

/** @} */

/** @{ \name Statistics */

/** Memory block statistics. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_stat_info {
    uint32_t memblock_total;           /**< Currently allocated memory blocks */
    uint32_t memblock_total_size;      /**< Current total size of allocated memory blocks */
    uint32_t memblock_allocated;       /**< Allocated memory blocks during the whole lifetime of the daemon. */
    uint32_t memblock_allocated_size;  /**< Total size of all memory blocks allocated during the whole lifetime of the daemon. */
    uint32_t scache_size;              /**< Total size of all sample cache entries. */
} pa_stat_info;

/** Callback prototype for pa_context_stat() */
typedef void (*pa_stat_info_cb_t) (pa_context *c, const pa_stat_info *i, void *userdata);

/** Get daemon memory block statistics */
pa_operation* pa_context_stat(pa_context *c, pa_stat_info_cb_t cb, void *userdata);

/** @} */

/** @{ \name Cached Samples */

/** Stores information about sample cache entries. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_sample_info {
    uint32_t index;                       /**< Index of this entry */
    const char *name;                     /**< Name of this entry */
    pa_cvolume volume;                    /**< Default volume of this entry */
    pa_sample_spec sample_spec;           /**< Sample specification of the sample */
    pa_channel_map channel_map;           /**< The channel map */
    pa_usec_t duration;                   /**< Duration of this entry */
    uint32_t bytes;                       /**< Length of this sample in bytes. */
    int lazy;                             /**< Non-zero when this is a lazy cache entry. */
    const char *filename;                 /**< In case this is a lazy cache entry, the filename for the sound file to be loaded on demand. */
    pa_proplist *proplist;                /**< Property list for this sample. \since 0.9.11 */
} pa_sample_info;

/** Callback prototype for pa_context_get_sample_info_by_name() and friends */
typedef void (*pa_sample_info_cb_t)(pa_context *c, const pa_sample_info *i, int eol, void *userdata);

/** Get information about a sample by its name */
pa_operation* pa_context_get_sample_info_by_name(pa_context *c, const char *name, pa_sample_info_cb_t cb, void *userdata);

/** Get information about a sample by its index */
pa_operation* pa_context_get_sample_info_by_index(pa_context *c, uint32_t idx, pa_sample_info_cb_t cb, void *userdata);

/** Get the complete list of samples stored in the daemon. */
pa_operation* pa_context_get_sample_info_list(pa_context *c, pa_sample_info_cb_t cb, void *userdata);

/** @} */

/** \cond fulldocs */

/** @{ \name Autoload Entries */

/** \deprecated Type of an autoload entry. */
typedef enum pa_autoload_type {
    PA_AUTOLOAD_SINK = 0,
    PA_AUTOLOAD_SOURCE = 1
} pa_autoload_type_t;

/** \deprecated Stores information about autoload entries. Please note that this structure
 * can be extended as part of evolutionary API updates at any time in
 * any new release. */
typedef struct pa_autoload_info {
    uint32_t index;               /**< Index of this autoload entry */
    const char *name;             /**< Name of the sink or source */
    pa_autoload_type_t type;      /**< Type of the autoload entry */
    const char *module;           /**< Module name to load */
    const char *argument;         /**< Argument string for module */
} pa_autoload_info;

/** \deprecated Callback prototype for pa_context_get_autoload_info_by_name() and friends */
typedef void (*pa_autoload_info_cb_t)(pa_context *c, const pa_autoload_info *i, int eol, void *userdata);

/** \deprecated Get info about a specific autoload entry. */
pa_operation* pa_context_get_autoload_info_by_name(pa_context *c, const char *name, pa_autoload_type_t type, pa_autoload_info_cb_t cb, void *userdata) PA_GCC_DEPRECATED;

/** \deprecated Get info about a specific autoload entry. */
pa_operation* pa_context_get_autoload_info_by_index(pa_context *c, uint32_t idx, pa_autoload_info_cb_t cb, void *userdata) PA_GCC_DEPRECATED;

/** \deprecated Get the complete list of autoload entries. */
pa_operation* pa_context_get_autoload_info_list(pa_context *c, pa_autoload_info_cb_t cb, void *userdata) PA_GCC_DEPRECATED;

/** \deprecated Add a new autoload entry. */
pa_operation* pa_context_add_autoload(pa_context *c, const char *name, pa_autoload_type_t type, const char *module, const char*argument, pa_context_index_cb_t, void* userdata) PA_GCC_DEPRECATED;

/** \deprecated Remove an autoload entry. */
pa_operation* pa_context_remove_autoload_by_name(pa_context *c, const char *name, pa_autoload_type_t type, pa_context_success_cb_t cb, void* userdata) PA_GCC_DEPRECATED;

/** \deprecated Remove an autoload entry. */
pa_operation* pa_context_remove_autoload_by_index(pa_context *c, uint32_t idx, pa_context_success_cb_t cb, void* userdata) PA_GCC_DEPRECATED;

/** @} */

/** \endcond */

PA_C_DECL_END

#endif