diff options
Diffstat (limited to 'backends/alsa/alsa-switch.c')
| -rw-r--r-- | backends/alsa/alsa-switch.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/backends/alsa/alsa-switch.c b/backends/alsa/alsa-switch.c new file mode 100644 index 0000000..15151ae --- /dev/null +++ b/backends/alsa/alsa-switch.c @@ -0,0 +1,227 @@ +/* + * Copyright (C) 2014 Michal Ratajsky <[email protected]> + * + * 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-switch.h" +#include "alsa-switch-option.h" + +struct _AlsaSwitchPrivate +{ + GList *options; + guint32 channel_mask; + snd_mixer_elem_t *element; +}; + +static void alsa_element_interface_init (AlsaElementInterface *iface); + +static void alsa_switch_class_init (AlsaSwitchClass *klass); +static void alsa_switch_init (AlsaSwitch *swtch); + +G_DEFINE_TYPE_WITH_CODE (AlsaSwitch, alsa_switch, + MATE_MIXER_TYPE_SWITCH, + G_IMPLEMENT_INTERFACE (ALSA_TYPE_ELEMENT, + alsa_element_interface_init)) + +static gboolean alsa_switch_set_active_option (MateMixerSwitch *mms, + MateMixerSwitchOption *mmso); + +static GList * alsa_switch_list_options (MateMixerSwitch *mms); + +static snd_mixer_elem_t * alsa_switch_get_snd_element (AlsaElement *element); +static void alsa_switch_set_snd_element (AlsaElement *element, + snd_mixer_elem_t *el); +static gboolean alsa_switch_load (AlsaElement *element); + +static void +alsa_element_interface_init (AlsaElementInterface *iface) +{ + iface->get_snd_element = alsa_switch_get_snd_element; + iface->set_snd_element = alsa_switch_set_snd_element; + iface->load = alsa_switch_load; +} + +static void +alsa_switch_class_init (AlsaSwitchClass *klass) +{ + MateMixerSwitchClass *switch_class; + + switch_class = MATE_MIXER_SWITCH_CLASS (klass); + switch_class->set_active_option = alsa_switch_set_active_option; + switch_class->list_options = alsa_switch_list_options; + + g_type_class_add_private (G_OBJECT_CLASS (klass), sizeof (AlsaSwitchPrivate)); +} + +static void +alsa_switch_init (AlsaSwitch *swtch) +{ + swtch->priv = G_TYPE_INSTANCE_GET_PRIVATE (swtch, + ALSA_TYPE_SWITCH, + AlsaSwitchPrivate); +} + +AlsaSwitch * +alsa_switch_new (const gchar *name, const gchar *label, GList *options) +{ + AlsaSwitch *swtch; + + swtch = g_object_new (ALSA_TYPE_SWITCH, + "name", name, + "label", label, + NULL); + + /* Takes ownership of options */ + swtch->priv->options = options; + return swtch; +} + +static gboolean +alsa_switch_set_active_option (MateMixerSwitch *mms, MateMixerSwitchOption *mmso) +{ + AlsaSwitch *swtch; + guint index; + gboolean set_item = FALSE; + snd_mixer_selem_channel_id_t channel; + + g_return_val_if_fail (ALSA_IS_SWITCH (mms), FALSE); + g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (mmso), FALSE); + + swtch = ALSA_SWITCH (mms); + + /* The channel mask is created when reading the active option the first + * time, so a successful load must be done before changing the option */ + if G_UNLIKELY (swtch->priv->channel_mask == 0) { + g_debug ("Not setting active switch option, channel mask unknown"); + return FALSE; + } + + index = alsa_switch_option_get_id (ALSA_SWITCH_OPTION (mmso)); + + for (channel = 0; channel < SND_MIXER_SCHN_LAST; channel++) { + /* The option is set per-channel, make sure to set it only for channels + * we successfully read the value from */ + if (swtch->priv->channel_mask & (1 << channel)) { + gint ret = snd_mixer_selem_set_enum_item (swtch->priv->element, + channel, + index); + if (ret == 0) + set_item = TRUE; + else + g_warning ("Failed to set active option of switch %s: %s", + snd_mixer_selem_get_name (swtch->priv->element), + snd_strerror (ret)); + } + } + return set_item; +} + +static GList * +alsa_switch_list_options (MateMixerSwitch *swtch) +{ + g_return_val_if_fail (ALSA_IS_SWITCH (swtch), NULL); + + return ALSA_SWITCH (swtch)->priv->options; +} + +static snd_mixer_elem_t * +alsa_switch_get_snd_element (AlsaElement *element) +{ + g_return_val_if_fail (ALSA_IS_SWITCH (element), NULL); + + return ALSA_SWITCH (element)->priv->element; +} + +static void +alsa_switch_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el) +{ + g_return_if_fail (ALSA_IS_SWITCH (element)); + g_return_if_fail (el != NULL); + + ALSA_SWITCH (element)->priv->element = el; +} + +static gboolean +alsa_switch_load (AlsaElement *element) +{ + AlsaSwitch *swtch; + GList *list; + guint item; + gint ret; + snd_mixer_selem_channel_id_t c; + + swtch = ALSA_SWITCH (element); + + /* When reading the first time we try all the channels, otherwise only the + * ones which returned success before */ + if (swtch->priv->channel_mask == 0) { + for (c = 0; c < SND_MIXER_SCHN_LAST; c++) { + ret = snd_mixer_selem_get_enum_item (swtch->priv->element, c, &item); + + /* 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) + swtch->priv->channel_mask |= 1 << c; + } + + /* The last ALSA call might have failed, but it doesn't matter if we have + * a channel mask */ + if (swtch->priv->channel_mask > 0) + ret = 0; + } else { + for (c = 0; !(swtch->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 */ + ret = snd_mixer_selem_get_enum_item (swtch->priv->element, c, &item); + } + + if (ret < 0) { + g_warning ("Failed to read active option of switch %s: %s", + snd_mixer_selem_get_name (swtch->priv->element), + snd_strerror (ret)); + return FALSE; + } + + list = swtch->priv->options; + while (list != NULL) { + AlsaSwitchOption *option = ALSA_SWITCH_OPTION (list->data); + + /* Mark the selected option when we find it, ALSA indentifies them + * by numeric indices */ + if (alsa_switch_option_get_id (option) == item) { + _mate_mixer_switch_set_active_option (MATE_MIXER_SWITCH (swtch), + MATE_MIXER_SWITCH_OPTION (option)); + return TRUE; + } + list = list->next; + } + + g_warning ("Unknown active option of switch %s: %d", + snd_mixer_selem_get_name (swtch->priv->element), + item); + + return FALSE; +} |