summaryrefslogtreecommitdiff
path: root/backends/alsa/alsa-toggle.c
blob: 9c15885ed98d776f2d5d583ed61382ae047537b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/*
 * Copyright (C) 2014 Michal Ratajsky <michal.ratajsky@gmail.com>
 *
 * 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 of the licence, or (at your option) any later version.
 *
 * This library 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, see <http://www.gnu.org/licenses/>.
 */

#include <glib.h>
#include <glib-object.h>
#include <alsa/asoundlib.h>

#include <libmatemixer/matemixer.h>
#include <libmatemixer/matemixer-private.h>

#include "alsa-element.h"
#include "alsa-stream.h"
#include "alsa-switch-option.h"
#include "alsa-toggle.h"

struct _AlsaTogglePrivate
{
    AlsaToggleType    type;
    guint32           channel_mask;
    snd_mixer_elem_t *element;
};

static void alsa_element_interface_init (AlsaElementInterface *iface);

G_DEFINE_TYPE_WITH_CODE (AlsaToggle, alsa_toggle, MATE_MIXER_TYPE_STREAM_TOGGLE,
                         G_ADD_PRIVATE(AlsaToggle)
                         G_IMPLEMENT_INTERFACE (ALSA_TYPE_ELEMENT,
                                                alsa_element_interface_init))

static gboolean          alsa_toggle_set_active_option (MateMixerSwitch       *mms,
                                                        MateMixerSwitchOption *mmso);

static snd_mixer_elem_t *alsa_toggle_get_snd_element   (AlsaElement           *element);
static void              alsa_toggle_set_snd_element   (AlsaElement           *element,
                                                        snd_mixer_elem_t      *el);
static gboolean          alsa_toggle_load              (AlsaElement           *element);

static void
alsa_element_interface_init (AlsaElementInterface *iface)
{
    iface->get_snd_element = alsa_toggle_get_snd_element;
    iface->set_snd_element = alsa_toggle_set_snd_element;
    iface->load            = alsa_toggle_load;
}

static void
alsa_toggle_class_init (AlsaToggleClass *klass)
{
    MateMixerSwitchClass *switch_class;

    switch_class = MATE_MIXER_SWITCH_CLASS (klass);
    switch_class->set_active_option = alsa_toggle_set_active_option;
}

static void
alsa_toggle_init (AlsaToggle *toggle)
{
    toggle->priv = alsa_toggle_get_instance_private (toggle);
}

AlsaToggle *
alsa_toggle_new (AlsaStream               *stream,
                 const gchar              *name,
                 const gchar              *label,
                 MateMixerStreamSwitchRole role,
                 AlsaToggleType            type,
                 AlsaSwitchOption         *on,
                 AlsaSwitchOption         *off)
{
    AlsaToggle *toggle;

    g_return_val_if_fail (ALSA_IS_STREAM (stream), NULL);
    g_return_val_if_fail (name  != NULL, NULL);
    g_return_val_if_fail (label != NULL, NULL);
    g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (on), NULL);
    g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (off), NULL);

    toggle = g_object_new (ALSA_TYPE_TOGGLE,
                           "name", name,
                           "label", label,
                           "flags", MATE_MIXER_STREAM_SWITCH_TOGGLE,
                           "role", role,
                           "stream", stream,
                           "on-state-option", on,
                           "off-state-option", off,
                           NULL);

    toggle->priv->type = type;
    return toggle;
}

static gboolean
alsa_toggle_set_active_option (MateMixerSwitch *mms, MateMixerSwitchOption *mmso)
{
    AlsaToggle *toggle;
    gint        value;
    gint        ret;

    g_return_val_if_fail (ALSA_IS_TOGGLE (mms), FALSE);
    g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (mmso), FALSE);

    toggle = ALSA_TOGGLE (mms);

    if (G_UNLIKELY (toggle->priv->element == NULL))
        return FALSE;

    /* For toggles the 0/1 value is stored as the switch option id, there is not really
     * a need to validate that the option belong to the switch, just make sure it
     * contains the value 0 or 1 */
    value = alsa_switch_option_get_id (ALSA_SWITCH_OPTION (mmso));
    if (G_UNLIKELY (value != 0 && value != 1)) {
        g_warn_if_reached ();
        return FALSE;
    }

    if (toggle->priv->type == ALSA_TOGGLE_CAPTURE)
        ret = snd_mixer_selem_set_capture_switch_all (toggle->priv->element, value);
    else
        ret = snd_mixer_selem_set_playback_switch_all (toggle->priv->element, value);

    if (ret < 0) {
        g_warning ("Failed to set value of toggle %s: %s",
                   snd_mixer_selem_get_name (toggle->priv->element),
                   snd_strerror (ret));
        return FALSE;
    }

    return TRUE;
}

static snd_mixer_elem_t *
alsa_toggle_get_snd_element (AlsaElement *element)
{
    g_return_val_if_fail (ALSA_IS_TOGGLE (element), NULL);

    return ALSA_TOGGLE (element)->priv->element;
}

static void
alsa_toggle_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el)
{
    g_return_if_fail (ALSA_IS_TOGGLE (element));

    ALSA_TOGGLE (element)->priv->element = el;
}

static gboolean
alsa_toggle_load (AlsaElement *element)
{
    AlsaToggle                  *toggle;
    gint                         value;
    gint                         ret;
    snd_mixer_selem_channel_id_t c;

    g_return_val_if_fail (ALSA_IS_TOGGLE (element), FALSE);

    toggle = ALSA_TOGGLE (element);

    if (G_UNLIKELY (toggle->priv->element == NULL))
        return FALSE;

    /* When reading the first time we try all the channels, otherwise only the
     * ones which returned success before */
    if (toggle->priv->channel_mask == 0) {
        for (c = 0; c < SND_MIXER_SCHN_LAST; c++) {
            if (toggle->priv->type == ALSA_TOGGLE_CAPTURE)
                ret = snd_mixer_selem_get_capture_switch (toggle->priv->element,
                                                          c,
                                                          &value);
            else
                ret = snd_mixer_selem_get_playback_switch (toggle->priv->element,
                                                           c,
                                                           &value);

            /* The active enum option is set per-channel, so when reading it the
             * first time, create a mask of all channels for which we read the
             * value successfully */
            if (ret == 0)
                toggle->priv->channel_mask |= 1 << c;
        }

        /* The last ALSA call might have failed, but it doesn't matter if we have
         * a channel mask */
        if (toggle->priv->channel_mask > 0)
            ret = 0;
    } else {
        for (c = 0; !(toggle->priv->channel_mask & (1 << c)); c++)
            ;

        /* When not reading the mask, the first usable channel is enough, we don't
         * support per-channel selections anyway */
        if (toggle->priv->type == ALSA_TOGGLE_CAPTURE)
            ret = snd_mixer_selem_get_capture_switch (toggle->priv->element,
                                                      c,
                                                      &value);
        else
            ret = snd_mixer_selem_get_playback_switch (toggle->priv->element,
                                                       c,
                                                       &value);
    }

    if (ret == 0) {
        MateMixerSwitchOption *active;

        if (value > 0)
            active = mate_mixer_stream_toggle_get_state_option (MATE_MIXER_STREAM_TOGGLE (toggle),
                                                                TRUE);
        else
            active = mate_mixer_stream_toggle_get_state_option (MATE_MIXER_STREAM_TOGGLE (toggle),
                                                                FALSE);

        _mate_mixer_switch_set_active_option (MATE_MIXER_SWITCH (toggle), active);
        return TRUE;
    }

    g_warning ("Failed to read state of toggle %s: %s",
               snd_mixer_selem_get_name (toggle->priv->element),
               snd_strerror (ret));

    return FALSE;
}