/** * \file include/use-case.h * \brief use case interface for the ALSA driver * \author Liam Girdwood * \author Stefan Schmidt * \author Jaroslav Kysela * \author Justin Xu * \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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 /** * \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 * 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. */ #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_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 * * - _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 * * - [=]{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 * - 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 ID string * - PlaybackSwitch * - playback control switch ID string * - CaptureRate * - capture device sample rate * - CaptureChannels * - capture device channel count * - CaptureCTL * - capture control device name * - CaptureVolume * - capture control volume ID string * - CaptureSwitch * - capture control switch ID string * - PlaybackMixer * - name of playback mixer * - PlaybackMixerID * - mixer playback ID * - CaptureMixer * - name of capture mixer * - CaptureMixerID * - mixer capture ID * - JackControl, JackDev, JackHWMute * - Jack information for a device. The jack status can be reported via * a kcontrol and/or via an input device. **JackControl** is the * kcontrol name of the jack, and **JackDev** is 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. * * If **JackHWMute** is set, it indicates that when the jack is plugged * in, the hardware automatically mutes some other device(s). The * JackHWMute value is a space-separated list of device names (this * isn't compatible with device names with spaces in them, so don't use * such device names!). 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. */ 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 */ 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); } /** * \} */ #ifdef __cplusplus } #endif #endif /* __ALSA_USE_CASE_H */