Merge branch 'oss-alsa'

1 files changed, 329 insertions, 0 deletions

diff --git a/backends/alsa/alsa-stream-output-control.c b/backends/alsa/alsa-stream-output-control.c
new file mode 100644
index 0000000..5a3e6b3
--- /dev/null
+++ b/backends/alsa/alsa-stream-output-control.c
@@ -0,0 +1,329 @@
+/*
+ * 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-stream-control.h"
+#include "alsa-stream-output-control.h"
+
+static void alsa_stream_output_control_class_init (AlsaStreamOutputControlClass *klass);
+static void alsa_stream_output_control_init       (AlsaStreamOutputControl      *control);
+
+G_DEFINE_TYPE (AlsaStreamOutputControl, alsa_stream_output_control, ALSA_TYPE_STREAM_CONTROL)
+
+static gboolean alsa_stream_output_control_load                    (AlsaStreamControl           *control);
+
+static gboolean alsa_stream_output_control_set_mute                (AlsaStreamControl           *control,
+                                                                    gboolean                     mute);
+
+static gboolean alsa_stream_output_control_set_volume              (AlsaStreamControl           *control,
+                                                                    guint                        volume);
+
+static gboolean alsa_stream_output_control_set_channel_volume      (AlsaStreamControl           *control,
+                                                                    snd_mixer_selem_channel_id_t channel,
+                                                                    guint                        volume);
+
+static gboolean alsa_stream_output_control_get_volume_from_decibel (AlsaStreamControl           *control,
+                                                                    gdouble                      decibel,
+                                                                    guint                       *volume);
+
+static gboolean alsa_stream_output_control_get_decibel_from_volume (AlsaStreamControl           *control,
+                                                                    guint                        volume,
+                                                                    gdouble                     *decibel);
+
+static void     read_volume_data (snd_mixer_elem_t *el,
+                                  AlsaControlData  *data);
+
+static void
+alsa_stream_output_control_class_init (AlsaStreamOutputControlClass *klass)
+{
+    AlsaStreamControlClass *control_class;
+
+    control_class = ALSA_STREAM_CONTROL_CLASS (klass);
+
+    control_class->load                    = alsa_stream_output_control_load;
+    control_class->set_mute                = alsa_stream_output_control_set_mute;
+    control_class->set_volume              = alsa_stream_output_control_set_volume;
+    control_class->set_channel_volume      = alsa_stream_output_control_set_channel_volume;
+    control_class->get_volume_from_decibel = alsa_stream_output_control_get_volume_from_decibel;
+    control_class->get_decibel_from_volume = alsa_stream_output_control_get_decibel_from_volume;
+}
+
+static void
+alsa_stream_output_control_init (AlsaStreamOutputControl *control)
+{
+}
+
+AlsaStreamControl *
+alsa_stream_output_control_new (const gchar               *name,
+                                const gchar               *label,
+                                MateMixerStreamControlRole role)
+{
+    return g_object_new (ALSA_TYPE_STREAM_OUTPUT_CONTROL,
+                         "name", name,
+                         "label", label,
+                         "role", role,
+                         NULL);
+}
+
+static gboolean
+alsa_stream_output_control_load (AlsaStreamControl *control)
+{
+    AlsaControlData   data;
+    snd_mixer_elem_t *el;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_OUTPUT_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Expect that the element has a volume control */
+    if G_UNLIKELY (snd_mixer_selem_has_playback_volume (el) == 0 &&
+                   snd_mixer_selem_has_common_volume (el) == 0) {
+        g_warn_if_reached ();
+        return FALSE;
+    }
+
+    memset (&data, 0, sizeof (AlsaControlData));
+
+    /* We model any control switch as mute */
+    if (snd_mixer_selem_has_playback_switch (el) == 1 ||
+        snd_mixer_selem_has_common_switch (el) == 1)
+        data.switch_usable = TRUE;
+
+    data.active = snd_mixer_selem_is_active (el);
+
+    /* Read the volume data but do not error out if it fails, since ALSA reports
+     * the control to have a volume, expect the control to match what we need - slider
+     * with an optional mute toggle.
+     * If it fails to read the volume data, just treat it as a volumeless control */
+    read_volume_data (el, &data);
+
+    alsa_stream_control_set_data (control, &data);
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_set_mute (AlsaStreamControl *control, gboolean mute)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the switch for all channels */
+    ret = snd_mixer_selem_set_playback_switch_all (el, !mute);
+    if (ret < 0) {
+        g_warning ("Failed to set playback switch: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_set_volume (AlsaStreamControl *control, guint volume)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the volume for all channels */
+    ret = snd_mixer_selem_set_playback_volume_all (el, volume);
+    if (ret < 0) {
+        g_warning ("Failed to set volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_set_channel_volume (AlsaStreamControl           *control,
+                                               snd_mixer_selem_channel_id_t channel,
+                                               guint                        volume)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the volume for a single channels, the volume may still be "joined" and
+     * set all the channels by itself */
+    ret = snd_mixer_selem_set_playback_volume (el, channel, volume);
+    if (ret < 0) {
+        g_warning ("Failed to set channel volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_get_volume_from_decibel (AlsaStreamControl *control,
+                                                    gdouble            decibel,
+                                                    guint             *volume)
+{
+    snd_mixer_elem_t *el;
+    glong             value;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    ret = snd_mixer_selem_ask_playback_dB_vol (el, (glong) (decibel * 100), 0, &value);
+    if (ret < 0) {
+        g_warning ("Failed to convert volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+
+    *volume = value;
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_get_decibel_from_volume (AlsaStreamControl *control,
+                                                    guint              volume,
+                                                    gdouble           *decibel)
+{
+    snd_mixer_elem_t *el;
+    glong             value;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    ret = snd_mixer_selem_ask_playback_vol_dB (el, (glong) volume, &value);
+    if (ret < 0) {
+        g_warning ("Failed to convert volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+
+    *decibel = value / 100.0;
+    return TRUE;
+}
+
+static void
+read_volume_data (snd_mixer_elem_t *el, AlsaControlData *data)
+{
+    glong volume;
+    glong min, max;
+    gint  ret;
+    gint  i;
+
+    /* Read volume ranges, this call should never fail on valid input */
+    ret = snd_mixer_selem_get_playback_volume_range (el, &min, &max);
+    if G_UNLIKELY (ret < 0) {
+        g_warning ("Failed to read playback volume range: %s", snd_strerror (ret));
+        return;
+    }
+    data->min = (guint) min;
+    data->max = (guint) max;
+
+    /* This fails when decibels are not supported */
+    ret = snd_mixer_selem_get_playback_dB_range (el, &min, &max);
+    if (ret == 0) {
+        data->min_decibel = min / 100.0;
+        data->max_decibel = max / 100.0;
+    } else
+        data->min_decibel = data->max_decibel = -MATE_MIXER_INFINITY;
+
+    for (i = 0; i < MATE_MIXER_CHANNEL_MAX; i++)
+        data->v[i] = data->min;
+
+    data->volume = data->min;
+    data->volume_joined = snd_mixer_selem_has_playback_volume_joined (el);
+
+    if (data->switch_usable == TRUE)
+        data->switch_joined = snd_mixer_selem_has_playback_switch_joined (el);
+
+    if (snd_mixer_selem_is_playback_mono (el) == 1) {
+        /* Special handling for single channel controls */
+        ret = snd_mixer_selem_get_playback_volume (el, SND_MIXER_SCHN_MONO, &volume);
+        if (ret == 0) {
+            data->channels = 1;
+
+            data->c[0] = MATE_MIXER_CHANNEL_MONO;
+            data->v[0] = data->volume = (guint) volume;
+        } else {
+            g_warning ("Failed to read playback volume: %s", snd_strerror (ret));
+        }
+
+        if (data->switch_usable == TRUE) {
+            gint value;
+
+            ret = snd_mixer_selem_get_playback_switch (el, SND_MIXER_SCHN_MONO, &value);
+            if G_LIKELY (ret == 0)
+                data->m[0] = !value;
+        }
+    } else {
+        snd_mixer_selem_channel_id_t channel;
+
+        /* We use numeric channel indices, but ALSA only works with channel
+         * positions, go over all the positions supported by ALSA and create
+         * a list of channels */
+         for (channel = 0; channel < SND_MIXER_SCHN_LAST; channel++) {
+            if (snd_mixer_selem_has_playback_channel (el, channel) == 0)
+                continue;
+
+            if (data->switch_usable == TRUE) {
+                gint value;
+
+                ret = snd_mixer_selem_get_playback_switch (el, channel, &value);
+                if (ret == 0)
+                    data->m[channel] = !value;
+            }
+
+            ret = snd_mixer_selem_get_playback_volume (el, channel, &volume);
+            if (ret < 0) {
+                g_warning ("Failed to read playback volume: %s", snd_strerror (ret));
+                continue;
+            }
+            data->channels++;
+
+            /* The single value volume is the highest channel volume */
+            if (data->volume < volume)
+                data->volume = volume;
+
+            data->c[channel] = alsa_channel_map_from[channel];
+            data->v[channel] = (guint) volume;
+        }
+    }
+}