dd82f13fa1
Also audiohw driver to specific device name, rewrite alsa controls code to cache more data, thus making the code easier and use less stack. Avoid using short/long in pcm alsa code since it's the wrong size on 64-bit (simulator for example) Change-Id: Ibc1ec44396e37b6cbdedbcf37300878638e5d2d3
270 lines
10 KiB
C
270 lines
10 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2016 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "alsa-controls.h"
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#include "panic.h"
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#include "debug.h"
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#include <stdlib.h>
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/* alsa control handle, we keep it open at all times */
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static snd_ctl_t *alsa_ctl;
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/* list of all controls, we allocate and fill it once, so we can easily lookup */
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static snd_ctl_elem_list_t *alsa_ctl_list;
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static unsigned alsa_ctl_count;
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/* for each control, we store some info to avoid constantly using ALSA's horrible lookup functions */
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static struct ctl_t
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{
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snd_ctl_elem_id_t *id; /* ID associated with the control */
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const char *name; /* name of the control */
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snd_ctl_elem_type_t type; /* control type (boolean, enum, ...) */
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unsigned count; /* dimension of the control */
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unsigned items; /* number of items (for enums) */
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const char **enum_name; /* names of the enum, indexed by ALSA index */
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} *alsa_ctl_info;
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#if defined(DEBUG)
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static const char *alsa_ctl_type_name(snd_ctl_elem_type_t type)
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{
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switch(type)
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{
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case SND_CTL_ELEM_TYPE_BOOLEAN: return "BOOLEAN";
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case SND_CTL_ELEM_TYPE_INTEGER: return "INTEGER";
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case SND_CTL_ELEM_TYPE_ENUMERATED: return "ENUMERATED";
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default: return "???";
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}
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}
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#endif
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void alsa_controls_init(const char *name)
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{
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/* allocate list on heap because it is used it is used in other functions */
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snd_ctl_elem_list_malloc(&alsa_ctl_list);
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/* there is only one card and "default" always works */
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if(snd_ctl_open(&alsa_ctl, name, 0) < 0)
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panicf("Cannot open ctl\n");
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/* ALSA is braindead: first "get" the list -> only retrieve count */
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if(snd_ctl_elem_list(alsa_ctl, alsa_ctl_list) < 0)
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panicf("Cannot get element list\n");
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/* now we can allocate the list since the know the size */
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alsa_ctl_count = snd_ctl_elem_list_get_count(alsa_ctl_list);
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if(snd_ctl_elem_list_alloc_space(alsa_ctl_list, alsa_ctl_count) < 0)
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panicf("Cannot allocate space for element list\n");
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/* ... and get the list again! */
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if(snd_ctl_elem_list(alsa_ctl, alsa_ctl_list) < 0)
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panicf("Cannot get element list\n");
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/* now cache the info */
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alsa_ctl_info = malloc(sizeof(struct ctl_t) * alsa_ctl_count);
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_info_malloc(&info);
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for(unsigned i = 0; i < alsa_ctl_count; i++)
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{
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/* allocate the ID and retrieve it */
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snd_ctl_elem_id_malloc(&alsa_ctl_info[i].id);
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snd_ctl_elem_list_get_id(alsa_ctl_list, i, alsa_ctl_info[i].id);
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/* NOTE: name is valid as long as the ID lives; since we keep both, no need to copy */
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alsa_ctl_info[i].name = snd_ctl_elem_id_get_name(alsa_ctl_info[i].id);
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/* get info */
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snd_ctl_elem_info_set_id(info, alsa_ctl_info[i].id);
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if(snd_ctl_elem_info(alsa_ctl, info) < 0)
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panicf("Cannot get control '%s' info", alsa_ctl_info[i].name);
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alsa_ctl_info[i].type = snd_ctl_elem_info_get_type(info);
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alsa_ctl_info[i].count = snd_ctl_elem_info_get_count(info);
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if(alsa_ctl_info[i].type == SND_CTL_ELEM_TYPE_ENUMERATED)
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{
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alsa_ctl_info[i].items = snd_ctl_elem_info_get_items(info);
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alsa_ctl_info[i].enum_name = malloc(sizeof(char *) * alsa_ctl_info[i].items);
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for(unsigned j = 0; j < alsa_ctl_info[i].items; j++)
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{
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snd_ctl_elem_info_set_item(info, j);
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if(snd_ctl_elem_info(alsa_ctl, info) < 0)
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panicf("Cannot get control '%s' info for item %u", alsa_ctl_info[i].name, j);
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/* NOTE: copy string because it becomes invalid after info is freed */
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alsa_ctl_info[i].enum_name[j] = strdup(snd_ctl_elem_info_get_item_name(info));
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}
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}
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else
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alsa_ctl_info[i].items = 0;
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}
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snd_ctl_elem_info_free(info);
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DEBUGF("ALSA controls:\n");
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for(unsigned i = 0; i < alsa_ctl_count; i++)
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{
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DEBUGF("- name='%s', type=%s, count=%u\n", alsa_ctl_info[i].name,
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alsa_ctl_type_name(alsa_ctl_info[i].type), alsa_ctl_info[i].count);
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if(alsa_ctl_info[i].type == SND_CTL_ELEM_TYPE_ENUMERATED)
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{
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DEBUGF(" items:");
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for(unsigned j = 0; j < alsa_ctl_info[i].items; j++)
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{
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if(j != 0)
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DEBUGF(",");
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DEBUGF(" '%s'", alsa_ctl_info[i].enum_name[j]);
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}
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DEBUGF("\n");
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}
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}
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}
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void alsa_controls_close(void)
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{
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snd_ctl_close(alsa_ctl);
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}
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/* find a control element ID by name, return -1 of not found or index into array */
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int alsa_controls_find(const char *name)
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{
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/* enumerate controls */
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for(unsigned i = 0; i < alsa_ctl_count; i++)
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if(strcmp(alsa_ctl_info[i].name, name) == 0)
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return i;
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/* not found */
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return -1;
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}
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bool alsa_has_control(const char *name)
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{
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return alsa_controls_find(name) >= 0;
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}
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/* find a control element enum index by name, return -1 if not found */
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int alsa_controls_find_enum(const char *name, const char *enum_name)
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{
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/* find control */
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int idx = alsa_controls_find(name);
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if(idx < 0)
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panicf("Cannot find control '%s'", name);
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/* list items */
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for(unsigned i = 0; i < alsa_ctl_info[idx].items; i++)
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{
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if(strcmp(alsa_ctl_info[idx].enum_name[i], enum_name) == 0)
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return i;
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}
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return -1;
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}
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/* set/get a control, potentially supports several values */
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void alsa_controls_get_set(bool get, const char *name, snd_ctl_elem_type_t type,
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unsigned nr_values, long *val)
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{
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snd_ctl_elem_value_t *value;
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/* allocate things on stack to speedup */
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snd_ctl_elem_value_alloca(&value);
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/* find control */
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int idx = alsa_controls_find(name);
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if(idx < 0)
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panicf("Cannot find control '%s'", name);
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/* check the type of the control */
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if(alsa_ctl_info[idx].type != type)
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panicf("Control '%s' has wrong type (got %d, expected %d", name,
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alsa_ctl_info[idx].type, type);
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if(alsa_ctl_info[idx].count != nr_values)
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panicf("Control '%s' has wrong count (got %u, expected %u)",
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name, alsa_ctl_info[idx].count, nr_values);
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snd_ctl_elem_value_set_id(value, alsa_ctl_info[idx].id);
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/* set value */
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if(get)
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{
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/* read value */
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if(snd_ctl_elem_read(alsa_ctl, value) < 0)
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panicf("Cannot read control '%s'", name);
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for(unsigned i = 0; i < nr_values; i++)
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{
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/* ALSA is braindead: there are "typed" setters but they all take long anyway */
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if(type == SND_CTL_ELEM_TYPE_BOOLEAN)
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val[i] = snd_ctl_elem_value_get_boolean(value, i);
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else if(type == SND_CTL_ELEM_TYPE_INTEGER)
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val[i] = snd_ctl_elem_value_get_integer(value, i);
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else if(type == SND_CTL_ELEM_TYPE_ENUMERATED)
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val[i] = snd_ctl_elem_value_get_enumerated(value, i);
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}
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}
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else
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{
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for(unsigned i = 0; i < nr_values; i++)
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{
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/* ALSA is braindead: there are "typed" setters but they all take long anyway */
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if(type == SND_CTL_ELEM_TYPE_BOOLEAN)
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snd_ctl_elem_value_set_boolean(value, i, val[i]);
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else if(type == SND_CTL_ELEM_TYPE_INTEGER)
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snd_ctl_elem_value_set_integer(value, i, val[i]);
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else if(type == SND_CTL_ELEM_TYPE_ENUMERATED)
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snd_ctl_elem_value_set_enumerated(value, i, val[i]);
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}
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/* write value */
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if(snd_ctl_elem_write(alsa_ctl, value) < 0)
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panicf("Cannot write control '%s'", name);
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}
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}
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/* set a control, potentially supports several values */
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void alsa_controls_set(const char *name, snd_ctl_elem_type_t type,
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unsigned nr_values, long *val)
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{
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return alsa_controls_get_set(false, name, type, nr_values, val);
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}
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/* get a control, potentially supports several values */
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void alsa_controls_get(const char *name, snd_ctl_elem_type_t type,
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unsigned nr_values, long *val)
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{
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return alsa_controls_get_set(true, name, type, nr_values, val);
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}
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/* get control information */
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void alsa_controls_get_info(const char *name, int *out_count)
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{
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/* find control */
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int idx = alsa_controls_find(name);
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if(idx < 0)
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panicf("Cannot find control '%s'", name);
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/* get info */
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*out_count = alsa_ctl_info[idx].count;
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}
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/* helper function: set a control with a single boolean value */
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void alsa_controls_set_bool(const char *name, bool val)
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{
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long lval = val;
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alsa_controls_set(name, SND_CTL_ELEM_TYPE_BOOLEAN, 1, &lval);
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}
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/* helper function: set a control with a single enum value */
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void alsa_controls_set_enum(const char *name, const char *enum_name)
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{
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long idx = alsa_controls_find_enum(name, enum_name);
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if(idx < 0)
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panicf("Cannot find enum '%s' for control '%s'", enum_name, name);
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alsa_controls_set(name, SND_CTL_ELEM_TYPE_ENUMERATED, 1, &idx);
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}
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/* helper function: set a control with one or more integers */
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void alsa_controls_set_ints(const char *name, int count, long *val)
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{
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return alsa_controls_set(name, SND_CTL_ELEM_TYPE_INTEGER, count, val);
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}
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/* helper function: get a control with a single boolean value */
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bool alsa_controls_get_bool(const char *name)
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{
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long lval = 0;
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alsa_controls_get(name, SND_CTL_ELEM_TYPE_BOOLEAN, 1, &lval);
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return lval != 0;
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}
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