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358 lines
12 KiB
C
358 lines
12 KiB
C
/**
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* \file include/use-case.h
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* \brief use case interface for the ALSA driver
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* \author Liam Girdwood <lrg@slimlogic.co.uk>
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* \author Stefan Schmidt <stefan@slimlogic.co.uk>
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* \author Jaroslav Kysela <perex@perex.cz>
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* \author Justin Xu <justinx@slimlogic.co.uk>
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* \date 2008-2010
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*/
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/*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (C) 2008-2010 SlimLogic Ltd
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* Copyright (C) 2010 Wolfson Microelectronics PLC
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* Copyright (C) 2010 Texas Instruments Inc.
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*
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* Support for the verb/device/modifier core logic and API,
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* command line tool and file parser was kindly sponsored by
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* Texas Instruments Inc.
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* Support for multiple active modifiers and devices,
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* transition sequences, multiple client access and user defined use
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* cases was kindly sponsored by Wolfson Microelectronics PLC.
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*/
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#ifndef __ALSA_USE_CASE_H
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#define __ALSA_USE_CASE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \defgroup Use Case Interface
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* The ALSA Use Case manager interface.
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* See \ref Usecase page for more details.
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* \{
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*/
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/**
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* ALSA Use Case Interface
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*
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* The use case manager works by configuring the sound card ALSA kcontrols to
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* change the hardware digital and analog audio routing to match the requested
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* device use case. The use case manager kcontrol configurations are stored in
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* easy to modify text files.
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*
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* An audio use case can be defined by a verb and device parameter. The verb
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* describes the use case action i.e. a phone call, listening to music, recording
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* a conversation etc. The device describes the physical audio capture and playback
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* hardware i.e. headphones, phone handset, bluetooth headset, etc.
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*
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* It's intended clients will mostly only need to set the use case verb and
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* device for each system use case change (as the verb and device parameters
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* cover most audio use cases).
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*
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* However there are times when a use case has to be modified at runtime. e.g.
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*
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* o Incoming phone call when the device is playing music
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* o Recording sections of a phone call
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* o Playing tones during a call.
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*
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* In order to allow asynchronous runtime use case adaptations, we have a third
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* optional modifier parameter that can be used to further configure
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* the use case during live audio runtime.
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*
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* This interface allows clients to :-
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*
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* o Query the supported use case verbs, devices and modifiers for the machine.
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* o Set and Get use case verbs, devices and modifiers for the machine.
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* o Get the ALSA PCM playback and capture device PCMs for use case verb,
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* use case device and modifier.
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* o Get the TQ parameter for each use case verb, use case device and
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* modifier.
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* o Get the ALSA master playback and capture volume/switch kcontrols
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* for each use case.
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*/
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/*
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* Use Case Verb.
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*
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* The use case verb is the main device audio action. e.g. the "HiFi" use
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* case verb will configure the audio hardware for HiFi Music playback
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* and capture.
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*/
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#define SND_USE_CASE_VERB_INACTIVE "Inactive"
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#define SND_USE_CASE_VERB_HIFI "HiFi"
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#define SND_USE_CASE_VERB_HIFI_LOW_POWER "HiFi Low Power"
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#define SND_USE_CASE_VERB_VOICE "Voice"
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#define SND_USE_CASE_VERB_VOICE_LOW_POWER "Voice Low Power"
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#define SND_USE_CASE_VERB_VOICECALL "Voice Call"
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#define SND_USE_CASE_VERB_IP_VOICECALL "Voice Call IP"
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#define SND_USE_CASE_VERB_ANALOG_RADIO "FM Analog Radio"
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#define SND_USE_CASE_VERB_DIGITAL_RADIO "FM Digital Radio"
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/* add new verbs to end of list */
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/*
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* Use Case Device.
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*
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* Physical system devices the render and capture audio. Devices can be OR'ed
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* together to support audio on simultaneous devices.
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*/
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#define SND_USE_CASE_DEV_NONE "None"
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#define SND_USE_CASE_DEV_SPEAKER "Speaker"
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#define SND_USE_CASE_DEV_LINE "Line"
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#define SND_USE_CASE_DEV_HEADPHONES "Headphones"
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#define SND_USE_CASE_DEV_HEADSET "Headset"
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#define SND_USE_CASE_DEV_HANDSET "Handset"
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#define SND_USE_CASE_DEV_BLUETOOTH "Bluetooth"
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#define SND_USE_CASE_DEV_EARPIECE "Earpiece"
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#define SND_USE_CASE_DEV_SPDIF "SPDIF"
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#define SND_USE_CASE_DEV_HDMI "HDMI"
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/* add new devices to end of list */
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/*
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* Use Case Modifiers.
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*
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* The use case modifier allows runtime configuration changes to deal with
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* asynchronous events.
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*
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* e.g. to record a voice call :-
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* 1. Set verb to SND_USE_CASE_VERB_VOICECALL (for voice call)
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* 2. Set modifier SND_USE_CASE_MOD_CAPTURE_VOICE when capture required.
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* 3. Call snd_use_case_get("CapturePCM") to get ALSA source PCM name
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* with captured voice pcm data.
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*
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* e.g. to play a ring tone when listenin to MP3 Music :-
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* 1. Set verb to SND_USE_CASE_VERB_HIFI (for MP3 playback)
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* 2. Set modifier to SND_USE_CASE_MOD_PLAY_TONE when incoming call happens.
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* 3. Call snd_use_case_get("PlaybackPCM") to get ALSA PCM sink name for
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* ringtone pcm data.
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*/
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#define SND_USE_CASE_MOD_CAPTURE_VOICE "Capture Voice"
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#define SND_USE_CASE_MOD_CAPTURE_MUSIC "Capture Music"
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#define SND_USE_CASE_MOD_PLAY_MUSIC "Play Music"
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#define SND_USE_CASE_MOD_PLAY_VOICE "Play Voice"
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#define SND_USE_CASE_MOD_PLAY_TONE "Play Tone"
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#define SND_USE_CASE_MOD_ECHO_REF "Echo Reference"
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/* add new modifiers to end of list */
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/**
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* TQ - Tone Quality
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*
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* The interface allows clients to determine the audio TQ required for each
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* use case verb and modifier. It's intended as an optional hint to the
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* audio driver in order to lower power consumption.
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*
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*/
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#define SND_USE_CASE_TQ_MUSIC "Music"
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#define SND_USE_CASE_TQ_VOICE "Voice"
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#define SND_USE_CASE_TQ_TONES "Tones"
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/** use case container */
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typedef struct snd_use_case_mgr snd_use_case_mgr_t;
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/**
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* \brief Create an identifier
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* \param fmt Format (sprintf like)
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* \param ... Optional arguments for sprintf like format
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* \return Allocated string identifier or NULL on error
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*/
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char *snd_use_case_identifier(const char *fmt, ...);
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/**
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* \brief Free a string list
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* \param list The string list to free
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* \param items Count of strings
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* \return Zero if success, otherwise a negative error code
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*/
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int snd_use_case_free_list(const char *list[], int items);
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/**
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* \brief Obtain a list of entries
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* \param uc_mgr Use case manager (may be NULL - card list)
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* \param identifier (may be NULL - card list)
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* \param list Returned allocated list
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* \return Number of list entries if success, otherwise a negative error code
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*
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* Defined identifiers:
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* NULL - get card list
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* (in pair cardname+comment)
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* _verbs - get verb list
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* (in pair verb+comment)
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* _devices[/<verb>] - get list of supported devices
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* (in pair device+comment)
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* _modifiers[/<verb>]- get list of supported modifiers
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* (in pair modifier+comment)
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* TQ[/<verb>] - get list of TQ identifiers
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* _enadevs - get list of enabled devices
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* _enamods - get list of enabled modifiers
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*
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*/
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int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
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const char *identifier,
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const char **list[]);
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/**
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* \brief Get current - string
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* \param uc_mgr Use case manager
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* \param identifier
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* \param value Value pointer
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* \return Zero if success, otherwise a negative error code
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*
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* Note: String is dynamically allocated, use free() to
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* deallocate this string.
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*
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* Known identifiers:
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* NULL - return current card
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* _verb - return current verb
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*
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* <NAME>[/<modifier>|</device>]
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* - value identifier <NAME> for
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* given modifier or device
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* - Examples: "PlaybackPCM/Play Music",
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* "CapturePCM/SPDIF"
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*
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* Recommended names for values:
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* TQ - Tone Quality
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* PlaybackPCM - full PCM playback device name
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* CapturePCM - full PCM capture device name
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* PlaybackCTL - playback control device name
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* PlaybackVolume - playback control volume ID string
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* PlaybackSwitch - playback control switch ID string
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* CaptureCTL - capture control device name
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* CaptureVolume - capture control volume ID string
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* CaptureSwitch - capture control switch ID string
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* PlaybackMixer - name of playback mixer
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* PlaybackMixerID - mixer playback ID
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* CaptureMixer - name of capture mixer
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* CaptureMixerID - mixer capture ID
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*/
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int snd_use_case_get(snd_use_case_mgr_t *uc_mgr,
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const char *identifier,
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const char **value);
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/**
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* \brief Get current - integer
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* \param uc_mgr Use case manager
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* \param identifier
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* \param value result
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* \return Zero if success, otherwise a negative error code
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*
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* Known identifiers:
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* _devstatus/<device> - return status for given device
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* _modstatus/<modifier> - return status for given modifier
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*/
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int snd_use_case_geti(snd_use_case_mgr_t *uc_mgr,
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const char *identifier,
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long *value);
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/**
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* \brief Set new
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* \param uc_mgr Use case manager
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* \param identifier
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* \param value Value
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* \return Zero if success, otherwise a negative error code
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*
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* Known identifiers:
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* _verb - set current verb = value
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* _enadev - enable given device = value
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* _disdev - disable given device = value
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* _swdev/<old_device> - new_device = value
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* - disable old_device and then enable new_device
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* - if old_device is not enabled just return
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* - check transmit sequence firstly
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* _enamod - enable given modifier = value
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* _dismod - disable given modifier = value
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* _swmod/<old_modifier> - new_modifier = value
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* - disable old_modifier and then enable new_modifier
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* - if old_modifier is not enabled just return
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* - check transmit sequence firstly
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*/
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int snd_use_case_set(snd_use_case_mgr_t *uc_mgr,
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const char *identifier,
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const char *value);
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/**
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* \brief Open and initialise use case core for sound card
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* \param uc_mgr Returned use case manager pointer
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* \param card_name Sound card name.
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* \return zero if success, otherwise a negative error code
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*/
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int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr, const char *card_name);
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/**
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* \brief Reload and re-parse use case configuration files for sound card.
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* \param uc_mgr Use case manager
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* \return zero if success, otherwise a negative error code
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*/
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int snd_use_case_mgr_reload(snd_use_case_mgr_t *uc_mgr);
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/**
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* \brief Close use case manager
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* \param uc_mgr Use case manager
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* \return zero if success, otherwise a negative error code
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*/
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int snd_use_case_mgr_close(snd_use_case_mgr_t *uc_mgr);
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/**
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* \brief Reset use case manager verb, device, modifier to deafult settings.
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* \param uc_mgr Use case manager
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* \return zero if success, otherwise a negative error code
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*/
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int snd_use_case_mgr_reset(snd_use_case_mgr_t *uc_mgr);
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/*
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* helper functions
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*/
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/**
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* \brief Obtain a list of cards
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* \param list Returned allocated list
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* \return Number of list entries if success, otherwise a negative error code
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*/
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static inline int snd_use_case_card_list(const char **list[])
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{
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return snd_use_case_get_list(NULL, NULL, list);
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}
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/**
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* \brief Obtain a list of verbs
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* \param uc_mgr Use case manager
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* \param list Returned list of verbs
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* \return Number of list entries if success, otherwise a negative error code
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*/
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static inline int snd_use_case_verb_list(snd_use_case_mgr_t *uc_mgr,
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const char **list[])
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{
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return snd_use_case_get_list(uc_mgr, "_verbs", list);
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}
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/**
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* \}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ALSA_USE_CASE_H */
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