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alsa-lib/include/use-case.h
Jaroslav Kysela f828dfe549 ucm: docs - remove MixerCopy values, add Priority for verb, improve priority docs 
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2019-12-10 11:48:06 +01:00

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/**
* \file include/use-case.h
* \brief use case interface for the ALSA driver
* \author Liam Girdwood <lrg@slimlogic.co.uk>
* \author Stefan Schmidt <stefan@slimlogic.co.uk>
* \author Jaroslav Kysela <perex@perex.cz>
* \author Justin Xu <justinx@slimlogic.co.uk>
* \date 2008-2010
*/
/*
*
* This library 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.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Copyright (C) 2008-2010 SlimLogic Ltd
* Copyright (C) 2010 Wolfson Microelectronics PLC
* Copyright (C) 2010 Texas Instruments Inc.
*
* Support for the verb/device/modifier core logic and API,
* command line tool and file parser was kindly sponsored by
* Texas Instruments Inc.
* Support for multiple active modifiers and devices,
* transition sequences, multiple client access and user defined use
* cases was kindly sponsored by Wolfson Microelectronics PLC.
*/
#ifndef __ALSA_USE_CASE_H
#define __ALSA_USE_CASE_H
#ifdef __cplusplus
extern "C" {
#endif
#include <alsa/asoundlib.h>
/**
* \defgroup ucm Use Case Interface
* The ALSA Use Case manager interface.
* See \ref Usecase page for more details.
* \{
*/
/*! \page Usecase ALSA Use Case Interface
*
* The use case manager works by configuring the sound card ALSA kcontrols to
* change the hardware digital and analog audio routing to match the requested
* device use case. The use case manager kcontrol configurations are stored in
* easy to modify text files.
*
* An audio use case can be defined by a verb and device parameter. The verb
* describes the use case action i.e. a phone call, listening to music, recording
* a conversation etc. The device describes the physical audio capture and playback
* hardware i.e. headphones, phone handset, bluetooth headset, etc.
*
* It's intended clients will mostly only need to set the use case verb and
* device for each system use case change (as the verb and device parameters
* cover most audio use cases).
*
* However there are times when a use case has to be modified at runtime. e.g.
*
* + Incoming phone call when the device is playing music
* + Recording sections of a phone call
* + Playing tones during a call.
*
* In order to allow asynchronous runtime use case adaptations, we have a third
* optional modifier parameter that can be used to further configure
* the use case during live audio runtime.
*
* This interface allows clients to :-
*
* + Query the supported use case verbs, devices and modifiers for the machine.
* + Set and Get use case verbs, devices and modifiers for the machine.
* + Get the ALSA PCM playback and capture device PCMs for use case verb,
* use case device and modifier.
* + Get the TQ parameter for each use case verb, use case device and
* modifier.
* + Get the ALSA master playback and capture volume/switch kcontrols
* or mixer elements for each use case.
*/
/*
* Use Case Verb.
*
* The use case verb is the main device audio action. e.g. the "HiFi" use
* case verb will configure the audio hardware for HiFi Music playback
* and capture.
*/
#define SND_USE_CASE_VERB_INACTIVE "Inactive" /**< Inactive Verb */
#define SND_USE_CASE_VERB_HIFI "HiFi" /**< HiFi Verb */
#define SND_USE_CASE_VERB_HIFI_LOW_POWER "HiFi Low Power" /**< HiFi Low Power Verb */
#define SND_USE_CASE_VERB_VOICE "Voice" /**< Voice Verb */
#define SND_USE_CASE_VERB_VOICE_LOW_POWER "Voice Low Power" /**< Voice Low Power Verb */
#define SND_USE_CASE_VERB_VOICECALL "Voice Call" /**< Voice Call Verb */
#define SND_USE_CASE_VERB_IP_VOICECALL "Voice Call IP" /**< Voice Call IP Verb */
#define SND_USE_CASE_VERB_ANALOG_RADIO "FM Analog Radio" /**< FM Analog Radio Verb */
#define SND_USE_CASE_VERB_DIGITAL_RADIO "FM Digital Radio" /**< FM Digital Radio Verb */
/* add new verbs to end of list */
/*
* Use Case Device.
*
* Physical system devices the render and capture audio. Devices can be OR'ed
* together to support audio on simultaneous devices.
*
* If multiple devices with the same name exists, the number suffixes should
* be added to these names like HDMI1,HDMI2,HDMI3 etc. No number gaps are
* allowed. The names with numbers must be continuous.
*
* If EnableSequence/DisableSequence controls independent paths in the hardware
* it is also recommended to split playback and capture UCM devices and use
* the number suffixes. Example use case: Use the integrated microphone
* in the laptop instead the microphone in headphones.
*
* The preference of the devices is determined by the priority value.
*/
#define SND_USE_CASE_DEV_NONE "None" /**< None Device */
#define SND_USE_CASE_DEV_SPEAKER "Speaker" /**< Speaker Device */
#define SND_USE_CASE_DEV_LINE "Line" /**< Line Device */
#define SND_USE_CASE_DEV_MIC "Mic" /**< Microphone Device */
#define SND_USE_CASE_DEV_HEADPHONES "Headphones" /**< Headphones Device */
#define SND_USE_CASE_DEV_HEADSET "Headset" /**< Headset Device */
#define SND_USE_CASE_DEV_HANDSET "Handset" /**< Handset Device */
#define SND_USE_CASE_DEV_BLUETOOTH "Bluetooth" /**< Bluetooth Device */
#define SND_USE_CASE_DEV_EARPIECE "Earpiece" /**< Earpiece Device */
#define SND_USE_CASE_DEV_SPDIF "SPDIF" /**< SPDIF Device */
#define SND_USE_CASE_DEV_HDMI "HDMI" /**< HDMI Device */
/* add new devices to end of list */
/*
* Use Case Modifiers.
*
* The use case modifier allows runtime configuration changes to deal with
* asynchronous events.
*
* e.g. to record a voice call :-
* 1. Set verb to SND_USE_CASE_VERB_VOICECALL (for voice call)
* 2. Set modifier SND_USE_CASE_MOD_CAPTURE_VOICE when capture required.
* 3. Call snd_use_case_get("CapturePCM") to get ALSA source PCM name
* with captured voice pcm data.
*
* e.g. to play a ring tone when listenin to MP3 Music :-
* 1. Set verb to SND_USE_CASE_VERB_HIFI (for MP3 playback)
* 2. Set modifier to SND_USE_CASE_MOD_PLAY_TONE when incoming call happens.
* 3. Call snd_use_case_get("PlaybackPCM") to get ALSA PCM sink name for
* ringtone pcm data.
*/
#define SND_USE_CASE_MOD_CAPTURE_VOICE "Capture Voice" /**< Capture Voice Modifier */
#define SND_USE_CASE_MOD_CAPTURE_MUSIC "Capture Music" /**< Capture Music Modifier */
#define SND_USE_CASE_MOD_PLAY_MUSIC "Play Music" /**< Play Music Modifier */
#define SND_USE_CASE_MOD_PLAY_VOICE "Play Voice" /**< Play Voice Modifier */
#define SND_USE_CASE_MOD_PLAY_TONE "Play Tone" /**< Play Tone Modifier */
#define SND_USE_CASE_MOD_ECHO_REF "Echo Reference" /**< Echo Reference Modifier */
/* add new modifiers to end of list */
/**
* TQ - Tone Quality
*
* The interface allows clients to determine the audio TQ required for each
* use case verb and modifier. It's intended as an optional hint to the
* audio driver in order to lower power consumption.
*
*/
#define SND_USE_CASE_TQ_MUSIC "Music" /**< Music Tone Quality */
#define SND_USE_CASE_TQ_VOICE "Voice" /**< Voice Tone Quality */
#define SND_USE_CASE_TQ_TONES "Tones" /**< Tones Tone Quality */
/** use case container */
typedef struct snd_use_case_mgr snd_use_case_mgr_t;
/**
* \brief Create an identifier
* \param fmt Format (sprintf like)
* \param ... Optional arguments for sprintf like format
* \return Allocated string identifier or NULL on error
*/
char *snd_use_case_identifier(const char *fmt, ...);
/**
* \brief Free a string list
* \param list The string list to free
* \param items Count of strings
* \return Zero if success, otherwise a negative error code
*/
int snd_use_case_free_list(const char *list[], int items);
/**
* \brief Obtain a list of entries
* \param uc_mgr Use case manager (may be NULL - card list)
* \param identifier (may be NULL - card list)
* \param list Returned allocated list
* \return Number of list entries if success, otherwise a negative error code
*
* Defined identifiers:
* - NULL - get card list
* (in pair cardname+comment)
* - _verbs - get verb list
* (in pair verb+comment)
* - _devices[/{verb}] - get list of supported devices
* (in pair device+comment)
* - _modifiers[/{verb}] - get list of supported modifiers
* (in pair modifier+comment)
* - TQ[/{verb}] - get list of TQ identifiers
* - _enadevs - get list of enabled devices
* - _enamods - get list of enabled modifiers
*
* - _identifiers/{modifier}|{device}[/{verb}] - list of value identifiers
* - _supporteddevs/{modifier}|{device}[/{verb}] - list of supported devices
* - _conflictingdevs/{modifier}|{device}[/{verb}] - list of conflicting devices
*
* Note that at most one of the supported/conflicting devs lists has
* any entries, and when neither is present, all devices are supported.
*
*/
int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
const char *identifier,
const char **list[]);
/**
* \brief Get current - string
* \param uc_mgr Use case manager
* \param identifier
* \param value Value pointer
* \return Zero if success, otherwise a negative error code
*
* Note: The returned string is dynamically allocated, use free() to
* deallocate this string. (Yes, the value parameter shouldn't be marked as
* "const", but it's too late to fix it, sorry about that.)
*
* Known identifiers:
* - NULL - return current card
* - _verb - return current verb
* - _file - return configuration file loaded for current card
*
* - [=]{NAME}[/[{modifier}|{/device}][/{verb}]]
* - value identifier {NAME}
* - Search starts at given modifier or device if any,
* else at a verb
* - Search starts at given verb if any,
* else current verb
* - Searches modifier/device, then verb, then defaults
* - Specify a leading "=" to search only the exact
* device/modifier/verb specified, and not search
* through each object in turn.
* - Examples:
* - "PlaybackPCM/Play Music"
* - "CapturePCM/SPDIF"
* - From ValueDefaults only:
* "=Variable"
* - From current active verb:
* "=Variable//"
* - From verb "Verb":
* "=Variable//Verb"
* - From "Modifier" in current active verb:
* "=Variable/Modifier/"
* - From "Modifier" in "Verb":
* "=Variable/Modifier/Verb"
*
* Recommended names for values:
* - TQ
* - Tone Quality
* - Priority
* - priority value (1-10000), higher value means higher priority
* - valid only for verbs
* - for devices - PlaybackPriority and CapturePriority
* - PlaybackPCM
* - full PCM playback device name
* - PlaybackPCMIsDummy
* - Valid values: "yes" and "no". If set to "yes", the PCM named by the
* PlaybackPCM value is a dummy device, meaning that opening it enables
* an audio path in the hardware, but writing to the PCM device has no
* effect.
* - CapturePCM
* - full PCM capture device name
* - CapturePCMIsDummy
* - Valid values: "yes" and "no". If set to "yes", the PCM named by the
* CapturePCM value is a dummy device, meaning that opening it enables
* an audio path in the hardware, but reading from the PCM device has no
* effect.
* - PlaybackRate
* - playback device sample rate
* - PlaybackChannels
* - playback device channel count
* - PlaybackCTL
* - playback control device name
* - PlaybackVolume
* - playback control volume identifier string
* - can be parsed using snd_use_case_parse_ctl_elem_id()
* - PlaybackSwitch
* - playback control switch identifier string
* - can be parsed using snd_use_case_parse_ctl_elem_id()
* - PlaybackPriority
* - priority value (1-10000), higher value means higher priority
* - CaptureRate
* - capture device sample rate
* - CaptureChannels
* - capture device channel count
* - CaptureCTL
* - capture control device name
* - CaptureVolume
* - capture control volume identifier string
* - can be parsed using snd_use_case_parse_ctl_elem_id()
* - CaptureSwitch
* - capture control switch identifier string
* - can be parsed using snd_use_case_parse_ctl_elem_id()
* - CapturePriority
* - priority value (1-10000), higher value means higher priority
* - PlaybackMixer
* - name of playback mixer
* - PlaybackMixerElem
* - mixer element playback identifier
* - can be parsed using snd_use_case_parse_selem_id()
* - PlaybackMasterElem
* - mixer element playback identifier for the master control
* - can be parsed using snd_use_case_parse_selem_id()
* - PlaybackMasterType
* - type of the master volume control
* - Valid values: "soft" (software attenuation)
* - CaptureMixer
* - name of capture mixer
* - CaptureMixerElem
* - mixer element capture identifier
* - can be parsed using snd_use_case_parse_selem_id()
* - CaptureMasterElem
* - mixer element playback identifier for the master control
* - can be parsed using snd_use_case_parse_selem_id()
* - CaptureMasterType
* - type of the master volume control
* - Valid values: "soft" (software attenuation)
* - EDIDFile
* - Path to EDID file for HDMI devices
* - JackCTL
* - jack control device name
* - JackControl
* - jack control identificator
* - can be parsed using snd_use_case_parse_ctl_elem_id()
* - UCM configuration files should contain both JackControl and JackDev
* when possible, because applications are likely to support only one
* or the other
* - JackDev
* - the input device id of the jack (if the full input device path is
* /dev/input/by-id/foo, the JackDev value should be "foo")
* - UCM configuration files should contain both JackControl and JackDev
* when possible, because applications are likely to support only one
* or the other
* - JackHWMute
* If this value is set, it indicates that when the jack is plugged
* in, the hardware automatically mutes some other device(s). The
* value is a space-separated list of device names. If the device
* name contains space, it must be enclosed to ' or ", e.g.:
* JackHWMute "'Dock Headphone' Headphone"
* Note that JackHWMute should be used only when the hardware enforces
* the automatic muting. If the hardware doesn't enforce any muting, it
* may still be tempting to set JackHWMute to trick upper software layers
* to e.g. automatically mute speakers when headphones are plugged in,
* but that's application policy configuration that doesn't belong
* to UCM configuration files.
* - MinBufferLevel
* - This is used on platform where reported buffer level is not accurate.
* E.g. "512", which holds 512 samples in device buffer. Note: this will
* increase latency.
*/
int snd_use_case_get(snd_use_case_mgr_t *uc_mgr,
const char *identifier,
const char **value);
/**
* \brief Get current - integer
* \param uc_mgr Use case manager
* \param identifier
* \param value result
* \return Zero if success, otherwise a negative error code
*
* Known identifiers:
* - _devstatus/{device} - return status for given device
* - _modstatus/{modifier} - return status for given modifier
*/
int snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
const char *identifier,
long *value);
/**
* \brief Set new
* \param uc_mgr Use case manager
* \param identifier
* \param value Value
* \return Zero if success, otherwise a negative error code
*
* Known identifiers:
* - _verb - set current verb = value
* - _enadev - enable given device = value
* - _disdev - disable given device = value
* - _swdev/{old_device} - new_device = value
* - disable old_device and then enable new_device
* - if old_device is not enabled just return
* - check transmit sequence firstly
* - _enamod - enable given modifier = value
* - _dismod - disable given modifier = value
* - _swmod/{old_modifier} - new_modifier = value
* - disable old_modifier and then enable new_modifier
* - if old_modifier is not enabled just return
* - check transmit sequence firstly
*/
int snd_use_case_set(snd_use_case_mgr_t *uc_mgr,
const char *identifier,
const char *value);
/**
* \brief Open and initialise use case core for sound card
* \param uc_mgr Returned use case manager pointer
* \param card_name Sound card name.
* \return zero if success, otherwise a negative error code
*
* By default only first card is used when the driver card
* name or long name is passed in the card_name argument.
*
* The "strict:" prefix in the card_name defines that
* there is no driver name / long name matching. The straight
* configuration is used.
*
* The "hw:" prefix in the card_name will load the configuration
* for the ALSA card specified by the card index (value) or
* the card string identificator.
*
* The sound card might be also composed from several physical
* sound cards (for the default and strict card_name).
* The application cannot expect that the device names will refer
* only one ALSA sound card in this case.
*/
int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr,
const char *card_name);
/**
* \brief Reload and re-parse use case configuration files for sound card.
* \param uc_mgr Use case manager
* \return zero if success, otherwise a negative error code
*/
int snd_use_case_mgr_reload(snd_use_case_mgr_t *uc_mgr);
/**
* \brief Close use case manager
* \param uc_mgr Use case manager
* \return zero if success, otherwise a negative error code
*/
int snd_use_case_mgr_close(snd_use_case_mgr_t *uc_mgr);
/**
* \brief Reset use case manager verb, device, modifier to deafult settings.
* \param uc_mgr Use case manager
* \return zero if success, otherwise a negative error code
*/
int snd_use_case_mgr_reset(snd_use_case_mgr_t *uc_mgr);
/*
* helper functions
*/
/**
* \brief Obtain a list of cards
* \param list Returned allocated list
* \return Number of list entries if success, otherwise a negative error code
*/
static __inline__ int snd_use_case_card_list(const char **list[])
{
return snd_use_case_get_list(NULL, NULL, list);
}
/**
* \brief Obtain a list of verbs
* \param uc_mgr Use case manager
* \param list Returned list of verbs
* \return Number of list entries if success, otherwise a negative error code
*/
static __inline__ int snd_use_case_verb_list(snd_use_case_mgr_t *uc_mgr,
const char **list[])
{
return snd_use_case_get_list(uc_mgr, "_verbs", list);
}
/**
* \brief Parse control element identifier
* \param elem_id Element identifier
* \param ucm_id Use case identifier
* \param value String value to be parsed
* \return Zero if success, otherwise a negative error code
*/
int snd_use_case_parse_ctl_elem_id(snd_ctl_elem_id_t *dst,
const char *ucm_id,
const char *value);
/**
* \brief Parse mixer element identifier
* \param dst Simple mixer element identifier
* \param ucm_id Use case identifier
* \param value String value to be parsed
* \return Zero if success, otherwise a negative error code
*/
int snd_use_case_parse_selem_id(snd_mixer_selem_id_t *dst,
const char *ucm_id,
const char *value);
/**
* \}
*/
#ifdef __cplusplus
}
#endif
#endif /* __ALSA_USE_CASE_H */
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