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https://gitee.com/openharmony/third_party_alsa-lib
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319 lines
14 KiB
C
319 lines
14 KiB
C
/**
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* \file include/mixer.h
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* \brief Application interface library for the ALSA driver
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* \author Jaroslav Kysela <perex@perex.cz>
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* \author Abramo Bagnara <abramo@alsa-project.org>
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* \author Takashi Iwai <tiwai@suse.de>
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* \date 1998-2001
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*
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* Application interface library for the ALSA driver
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef __ALSA_MIXER_H
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#define __ALSA_MIXER_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 Mixer Mixer Interface
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* The mixer interface.
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* \{
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*/
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/** Mixer handle */
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typedef struct _snd_mixer snd_mixer_t;
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/** Mixer elements class handle */
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typedef struct _snd_mixer_class snd_mixer_class_t;
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/** Mixer element handle */
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typedef struct _snd_mixer_elem snd_mixer_elem_t;
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/**
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* \brief Mixer callback function
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* \param mixer Mixer handle
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* \param mask event mask
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* \param elem related mixer element (if any)
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* \return 0 on success otherwise a negative error code
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*/
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typedef int (*snd_mixer_callback_t)(snd_mixer_t *ctl,
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unsigned int mask,
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snd_mixer_elem_t *elem);
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/**
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* \brief Mixer element callback function
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* \param elem Mixer element
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* \param mask event mask
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* \return 0 on success otherwise a negative error code
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*/
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typedef int (*snd_mixer_elem_callback_t)(snd_mixer_elem_t *elem,
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unsigned int mask);
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/**
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* \brief Compare function for sorting mixer elements
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* \param e1 First element
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* \param e2 Second element
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* \return -1 if e1 < e2, 0 if e1 == e2, 1 if e1 > e2
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*/
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typedef int (*snd_mixer_compare_t)(const snd_mixer_elem_t *e1,
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const snd_mixer_elem_t *e2);
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/**
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* \brief Event callback for the mixer class
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* \param class_ Mixer class
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* \param mask Event mask (SND_CTL_EVENT_*)
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* \param helem HCTL element which invoked the event
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* \param melem Mixer element associated to HCTL element
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* \return zero if success, otherwise a negative error value
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*/
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typedef int (*snd_mixer_event_t)(snd_mixer_class_t *class_, unsigned int mask,
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snd_hctl_elem_t *helem, snd_mixer_elem_t *melem);
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/** Mixer element type */
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typedef enum _snd_mixer_elem_type {
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/* Simple mixer elements */
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SND_MIXER_ELEM_SIMPLE,
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SND_MIXER_ELEM_LAST = SND_MIXER_ELEM_SIMPLE
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} snd_mixer_elem_type_t;
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int snd_mixer_open(snd_mixer_t **mixer, int mode);
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int snd_mixer_close(snd_mixer_t *mixer);
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snd_mixer_elem_t *snd_mixer_first_elem(snd_mixer_t *mixer);
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snd_mixer_elem_t *snd_mixer_last_elem(snd_mixer_t *mixer);
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int snd_mixer_handle_events(snd_mixer_t *mixer);
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int snd_mixer_attach(snd_mixer_t *mixer, const char *name);
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int snd_mixer_attach_hctl(snd_mixer_t *mixer, snd_hctl_t *hctl);
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int snd_mixer_detach(snd_mixer_t *mixer, const char *name);
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int snd_mixer_detach_hctl(snd_mixer_t *mixer, snd_hctl_t *hctl);
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int snd_mixer_get_hctl(snd_mixer_t *mixer, const char *name, snd_hctl_t **hctl);
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int snd_mixer_poll_descriptors_count(snd_mixer_t *mixer);
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int snd_mixer_poll_descriptors(snd_mixer_t *mixer, struct pollfd *pfds, unsigned int space);
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int snd_mixer_poll_descriptors_revents(snd_mixer_t *mixer, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
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int snd_mixer_load(snd_mixer_t *mixer);
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void snd_mixer_free(snd_mixer_t *mixer);
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int snd_mixer_wait(snd_mixer_t *mixer, int timeout);
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int snd_mixer_set_compare(snd_mixer_t *mixer, snd_mixer_compare_t msort);
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void snd_mixer_set_callback(snd_mixer_t *obj, snd_mixer_callback_t val);
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void * snd_mixer_get_callback_private(const snd_mixer_t *obj);
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void snd_mixer_set_callback_private(snd_mixer_t *obj, void * val);
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unsigned int snd_mixer_get_count(const snd_mixer_t *obj);
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int snd_mixer_class_unregister(snd_mixer_class_t *clss);
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snd_mixer_elem_t *snd_mixer_elem_next(snd_mixer_elem_t *elem);
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snd_mixer_elem_t *snd_mixer_elem_prev(snd_mixer_elem_t *elem);
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void snd_mixer_elem_set_callback(snd_mixer_elem_t *obj, snd_mixer_elem_callback_t val);
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void * snd_mixer_elem_get_callback_private(const snd_mixer_elem_t *obj);
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void snd_mixer_elem_set_callback_private(snd_mixer_elem_t *obj, void * val);
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snd_mixer_elem_type_t snd_mixer_elem_get_type(const snd_mixer_elem_t *obj);
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int snd_mixer_class_register(snd_mixer_class_t *class_, snd_mixer_t *mixer);
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int snd_mixer_elem_new(snd_mixer_elem_t **elem,
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snd_mixer_elem_type_t type,
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int compare_weight,
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void *private_data,
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void (*private_free)(snd_mixer_elem_t *elem));
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int snd_mixer_elem_add(snd_mixer_elem_t *elem, snd_mixer_class_t *class_);
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int snd_mixer_elem_remove(snd_mixer_elem_t *elem);
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void snd_mixer_elem_free(snd_mixer_elem_t *elem);
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int snd_mixer_elem_info(snd_mixer_elem_t *elem);
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int snd_mixer_elem_value(snd_mixer_elem_t *elem);
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int snd_mixer_elem_attach(snd_mixer_elem_t *melem, snd_hctl_elem_t *helem);
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int snd_mixer_elem_detach(snd_mixer_elem_t *melem, snd_hctl_elem_t *helem);
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int snd_mixer_elem_empty(snd_mixer_elem_t *melem);
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void *snd_mixer_elem_get_private(const snd_mixer_elem_t *melem);
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size_t snd_mixer_class_sizeof(void);
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/** \hideinitializer
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* \brief allocate an invalid #snd_mixer_class_t using standard alloca
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* \param ptr returned pointer
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*/
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#define snd_mixer_class_alloca(ptr) __snd_alloca(ptr, snd_mixer_class)
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int snd_mixer_class_malloc(snd_mixer_class_t **ptr);
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void snd_mixer_class_free(snd_mixer_class_t *obj);
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void snd_mixer_class_copy(snd_mixer_class_t *dst, const snd_mixer_class_t *src);
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snd_mixer_t *snd_mixer_class_get_mixer(const snd_mixer_class_t *class_);
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snd_mixer_event_t snd_mixer_class_get_event(const snd_mixer_class_t *class_);
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void *snd_mixer_class_get_private(const snd_mixer_class_t *class_);
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snd_mixer_compare_t snd_mixer_class_get_compare(const snd_mixer_class_t *class_);
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int snd_mixer_class_set_event(snd_mixer_class_t *class_, snd_mixer_event_t event);
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int snd_mixer_class_set_private(snd_mixer_class_t *class_, void *private_data);
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int snd_mixer_class_set_private_free(snd_mixer_class_t *class_, void (*private_free)(snd_mixer_class_t *));
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int snd_mixer_class_set_compare(snd_mixer_class_t *class_, snd_mixer_compare_t compare);
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/**
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* \defgroup SimpleMixer Simple Mixer Interface
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* \ingroup Mixer
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* The simple mixer interface.
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* \{
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*/
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/* Simple mixer elements API */
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/** Mixer simple element channel identifier */
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typedef enum _snd_mixer_selem_channel_id {
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/** Unknown */
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SND_MIXER_SCHN_UNKNOWN = -1,
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/** Front left */
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SND_MIXER_SCHN_FRONT_LEFT = 0,
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/** Front right */
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SND_MIXER_SCHN_FRONT_RIGHT,
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/** Rear left */
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SND_MIXER_SCHN_REAR_LEFT,
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/** Rear right */
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SND_MIXER_SCHN_REAR_RIGHT,
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/** Front center */
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SND_MIXER_SCHN_FRONT_CENTER,
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/** Woofer */
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SND_MIXER_SCHN_WOOFER,
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/** Side Left */
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SND_MIXER_SCHN_SIDE_LEFT,
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/** Side Right */
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SND_MIXER_SCHN_SIDE_RIGHT,
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/** Rear Center */
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SND_MIXER_SCHN_REAR_CENTER,
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SND_MIXER_SCHN_LAST = 31,
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/** Mono (Front left alias) */
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SND_MIXER_SCHN_MONO = SND_MIXER_SCHN_FRONT_LEFT
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} snd_mixer_selem_channel_id_t;
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/** Mixer simple element - register options - abstraction level */
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enum snd_mixer_selem_regopt_abstract {
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/** no abstraction - try use all universal controls from driver */
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SND_MIXER_SABSTRACT_NONE = 0,
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/** basic abstraction - Master,PCM,CD,Aux,Record-Gain etc. */
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SND_MIXER_SABSTRACT_BASIC,
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};
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/** Mixer simple element - register options */
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struct snd_mixer_selem_regopt {
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/** structure version */
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int ver;
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/** v1: abstract layer selection */
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enum snd_mixer_selem_regopt_abstract abstract;
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/** v1: device name (must be NULL when playback_pcm or capture_pcm != NULL) */
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const char *device;
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/** v1: playback PCM connected to mixer device (NULL == none) */
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snd_pcm_t *playback_pcm;
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/** v1: capture PCM connected to mixer device (NULL == none) */
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snd_pcm_t *capture_pcm;
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};
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/** Mixer simple element identifier */
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typedef struct _snd_mixer_selem_id snd_mixer_selem_id_t;
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const char *snd_mixer_selem_channel_name(snd_mixer_selem_channel_id_t channel);
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int snd_mixer_selem_register(snd_mixer_t *mixer,
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struct snd_mixer_selem_regopt *options,
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snd_mixer_class_t **classp);
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void snd_mixer_selem_get_id(snd_mixer_elem_t *element,
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snd_mixer_selem_id_t *id);
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const char *snd_mixer_selem_get_name(snd_mixer_elem_t *elem);
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unsigned int snd_mixer_selem_get_index(snd_mixer_elem_t *elem);
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snd_mixer_elem_t *snd_mixer_find_selem(snd_mixer_t *mixer,
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const snd_mixer_selem_id_t *id);
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int snd_mixer_selem_is_active(snd_mixer_elem_t *elem);
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int snd_mixer_selem_is_playback_mono(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_playback_channel(snd_mixer_elem_t *obj, snd_mixer_selem_channel_id_t channel);
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int snd_mixer_selem_is_capture_mono(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_capture_channel(snd_mixer_elem_t *obj, snd_mixer_selem_channel_id_t channel);
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int snd_mixer_selem_get_capture_group(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_common_volume(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_playback_volume(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_playback_volume_joined(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_capture_volume(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_capture_volume_joined(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_common_switch(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_playback_switch(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_playback_switch_joined(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_capture_switch(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_capture_switch_joined(snd_mixer_elem_t *elem);
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int snd_mixer_selem_has_capture_switch_exclusive(snd_mixer_elem_t *elem);
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int snd_mixer_selem_ask_playback_vol_dB(snd_mixer_elem_t *elem, long value, long *dBvalue);
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int snd_mixer_selem_ask_capture_vol_dB(snd_mixer_elem_t *elem, long value, long *dBvalue);
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int snd_mixer_selem_ask_playback_dB_vol(snd_mixer_elem_t *elem, long dBvalue, int dir, long *value);
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int snd_mixer_selem_ask_capture_dB_vol(snd_mixer_elem_t *elem, long dBvalue, int dir, long *value);
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int snd_mixer_selem_get_playback_volume(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long *value);
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int snd_mixer_selem_get_capture_volume(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long *value);
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int snd_mixer_selem_get_playback_dB(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long *value);
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int snd_mixer_selem_get_capture_dB(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long *value);
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int snd_mixer_selem_get_playback_switch(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, int *value);
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int snd_mixer_selem_get_capture_switch(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, int *value);
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int snd_mixer_selem_set_playback_volume(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long value);
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int snd_mixer_selem_set_capture_volume(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long value);
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int snd_mixer_selem_set_playback_dB(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long value, int dir);
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int snd_mixer_selem_set_capture_dB(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, long value, int dir);
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int snd_mixer_selem_set_playback_volume_all(snd_mixer_elem_t *elem, long value);
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int snd_mixer_selem_set_capture_volume_all(snd_mixer_elem_t *elem, long value);
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int snd_mixer_selem_set_playback_dB_all(snd_mixer_elem_t *elem, long value, int dir);
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int snd_mixer_selem_set_capture_dB_all(snd_mixer_elem_t *elem, long value, int dir);
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int snd_mixer_selem_set_playback_switch(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, int value);
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int snd_mixer_selem_set_capture_switch(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, int value);
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int snd_mixer_selem_set_playback_switch_all(snd_mixer_elem_t *elem, int value);
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int snd_mixer_selem_set_capture_switch_all(snd_mixer_elem_t *elem, int value);
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int snd_mixer_selem_get_playback_volume_range(snd_mixer_elem_t *elem,
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long *min, long *max);
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int snd_mixer_selem_get_playback_dB_range(snd_mixer_elem_t *elem,
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long *min, long *max);
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int snd_mixer_selem_set_playback_volume_range(snd_mixer_elem_t *elem,
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long min, long max);
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int snd_mixer_selem_get_capture_volume_range(snd_mixer_elem_t *elem,
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long *min, long *max);
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int snd_mixer_selem_get_capture_dB_range(snd_mixer_elem_t *elem,
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long *min, long *max);
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int snd_mixer_selem_set_capture_volume_range(snd_mixer_elem_t *elem,
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long min, long max);
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int snd_mixer_selem_is_enumerated(snd_mixer_elem_t *elem);
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int snd_mixer_selem_is_enum_playback(snd_mixer_elem_t *elem);
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int snd_mixer_selem_is_enum_capture(snd_mixer_elem_t *elem);
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int snd_mixer_selem_get_enum_items(snd_mixer_elem_t *elem);
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int snd_mixer_selem_get_enum_item_name(snd_mixer_elem_t *elem, unsigned int idx, size_t maxlen, char *str);
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int snd_mixer_selem_get_enum_item(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, unsigned int *idxp);
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int snd_mixer_selem_set_enum_item(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, unsigned int idx);
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size_t snd_mixer_selem_id_sizeof(void);
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/** \hideinitializer
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* \brief allocate an invalid #snd_mixer_selem_id_t using standard alloca
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* \param ptr returned pointer
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*/
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#define snd_mixer_selem_id_alloca(ptr) __snd_alloca(ptr, snd_mixer_selem_id)
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int snd_mixer_selem_id_malloc(snd_mixer_selem_id_t **ptr);
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void snd_mixer_selem_id_free(snd_mixer_selem_id_t *obj);
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void snd_mixer_selem_id_copy(snd_mixer_selem_id_t *dst, const snd_mixer_selem_id_t *src);
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const char *snd_mixer_selem_id_get_name(const snd_mixer_selem_id_t *obj);
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unsigned int snd_mixer_selem_id_get_index(const snd_mixer_selem_id_t *obj);
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void snd_mixer_selem_id_set_name(snd_mixer_selem_id_t *obj, const char *val);
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void snd_mixer_selem_id_set_index(snd_mixer_selem_id_t *obj, unsigned int val);
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int snd_mixer_selem_id_parse(snd_mixer_selem_id_t *dst, const char *str);
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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_MIXER_H */
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