2 * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * mixertrack.c: mixer track object design
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 * SECTION:gstmixertrack
24 * @short_description: Basic mixer control object (volume slider, switch)
25 * @see_also: GstMixer, GstMixerOptions
27 * Basic mixer control object (note that it is a GObject and not a GstObject).
29 * A mixer track represents a single slider control of none, one or more
30 * channels. A mixer track with no channels is usually interpreted as a
31 * on/off switch control.
33 * Note the presence of both min_volume and max_volume fields. Applications
34 * must not assume that min_volume is 0 or max_volume is any particular
42 #include "mixertrack.h"
47 SIGNAL_VOLUME_CHANGED,
48 SIGNAL_RECORD_TOGGLED,
52 static guint signals[LAST_SIGNAL] = { 0 };
59 ARG_UNTRANSLATED_LABEL,
67 static void gst_mixer_track_class_init (GstMixerTrackClass * klass);
68 static void gst_mixer_track_init (GstMixerTrack * mixer);
69 static void gst_mixer_track_dispose (GObject * object);
71 static void gst_mixer_track_get_property (GObject * object, guint prop_id,
72 GValue * value, GParamSpec * pspec);
73 static void gst_mixer_track_set_property (GObject * object, guint prop_id,
74 const GValue * value, GParamSpec * pspec);
76 static GObjectClass *parent_class = NULL;
79 gst_mixer_track_get_type (void)
81 static GType gst_mixer_track_type = 0;
83 if (!gst_mixer_track_type) {
84 static const GTypeInfo mixer_track_info = {
85 sizeof (GstMixerTrackClass),
88 (GClassInitFunc) gst_mixer_track_class_init,
91 sizeof (GstMixerTrack),
93 (GInstanceInitFunc) gst_mixer_track_init,
97 gst_mixer_track_type =
98 g_type_register_static (G_TYPE_OBJECT,
99 "GstMixerTrack", &mixer_track_info, 0);
102 return gst_mixer_track_type;
106 gst_mixer_track_class_init (GstMixerTrackClass * klass)
108 GObjectClass *object_klass = G_OBJECT_CLASS (klass);
110 parent_class = g_type_class_peek_parent (klass);
112 object_klass->get_property = gst_mixer_track_get_property;
113 object_klass->set_property = gst_mixer_track_set_property;
115 g_object_class_install_property (object_klass, ARG_LABEL,
116 g_param_spec_string ("label", "Track label",
117 "The label assigned to the track (may be translated)", NULL,
118 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS | G_PARAM_STATIC_STRINGS));
121 * GstMixerTrack:untranslated-label
123 * The untranslated label of the mixer track, if available. Mixer track
124 * implementations must set this at construct time. Applications may find
125 * this useful to determine icons for various kind of tracks. However,
126 * applications mustn't make any assumptions about the naming of tracks,
127 * the untranslated labels are purely informational and may change.
131 g_object_class_install_property (object_klass, ARG_UNTRANSLATED_LABEL,
132 g_param_spec_string ("untranslated-label", "Untranslated track label",
133 "The untranslated label assigned to the track (since 0.10.13)",
135 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
138 * GstMixerTrack:index
140 * Index of the mixer track, if available. Mixer track implementations
141 * must set this at construct time. This can be used to discern between
142 * multiple tracks with identical labels.
146 g_object_class_install_property (object_klass, ARG_INDEX,
147 g_param_spec_uint ("index", "Index",
148 "Track index", 0, G_MAXUINT,
149 0, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
151 g_object_class_install_property (object_klass, ARG_MIN_VOLUME,
152 g_param_spec_int ("min-volume", "Minimum volume level",
153 "The minimum possible volume level", G_MININT, G_MAXINT,
154 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
156 g_object_class_install_property (object_klass, ARG_MAX_VOLUME,
157 g_param_spec_int ("max-volume", "Maximum volume level",
158 "The maximum possible volume level", G_MININT, G_MAXINT,
159 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
161 g_object_class_install_property (object_klass, ARG_FLAGS,
162 g_param_spec_uint ("flags", "Flags",
163 "Flags indicating the type of mixer track",
164 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
166 g_object_class_install_property (object_klass, ARG_NUM_CHANNELS,
167 g_param_spec_int ("num-channels", "Number of channels",
168 "The number of channels contained within the track",
169 0, G_MAXINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
172 signals[SIGNAL_RECORD_TOGGLED] =
173 g_signal_new ("record_toggled", G_TYPE_FROM_CLASS (klass),
175 G_STRUCT_OFFSET (GstMixerTrackClass,
177 NULL, NULL, g_cclosure_marshal_VOID__BOOLEAN,
178 G_TYPE_NONE, 1, G_TYPE_BOOLEAN);
179 signals[SIGNAL_MUTE_TOGGLED] =
180 g_signal_new ("mute_toggled", G_TYPE_FROM_CLASS (klass),
182 G_STRUCT_OFFSET (GstMixerTrackClass,
184 NULL, NULL, g_cclosure_marshal_VOID__BOOLEAN,
185 G_TYPE_NONE, 1, G_TYPE_BOOLEAN);
186 signals[SIGNAL_VOLUME_CHANGED] =
187 g_signal_new ("volume_changed", G_TYPE_FROM_CLASS (klass),
189 G_STRUCT_OFFSET (GstMixerTrackClass,
191 NULL, NULL, g_cclosure_marshal_VOID__POINTER,
192 G_TYPE_NONE, 1, G_TYPE_POINTER);
195 object_klass->dispose = gst_mixer_track_dispose;
199 gst_mixer_track_init (GstMixerTrack * mixer_track)
201 mixer_track->label = NULL;
202 mixer_track->min_volume = mixer_track->max_volume = 0;
203 mixer_track->flags = 0;
204 mixer_track->num_channels = 0;
207 /* FIXME 0.11: move these as members into the mixer track structure */
208 #define MIXER_TRACK_OBJECT_DATA_KEY_UNTRANSLATED_LABEL "gst-mixer-track-ulabel"
209 #define MIXER_TRACK_OBJECT_DATA_KEY_INDEX "index"
212 gst_mixer_track_get_property (GObject * object, guint prop_id, GValue * value,
215 GstMixerTrack *mixer_track;
217 mixer_track = GST_MIXER_TRACK (object);
221 g_value_set_string (value, mixer_track->label);
223 case ARG_UNTRANSLATED_LABEL:
224 g_value_set_string (value,
225 (const gchar *) g_object_get_data (G_OBJECT (mixer_track),
226 MIXER_TRACK_OBJECT_DATA_KEY_UNTRANSLATED_LABEL));
229 g_value_set_uint (value,
230 GPOINTER_TO_INT (g_object_get_data (G_OBJECT (mixer_track),
231 MIXER_TRACK_OBJECT_DATA_KEY_INDEX)));
234 g_value_set_int (value, mixer_track->min_volume);
237 g_value_set_int (value, mixer_track->max_volume);
240 g_value_set_uint (value, (guint32) mixer_track->flags);
242 case ARG_NUM_CHANNELS:
243 g_value_set_int (value, mixer_track->num_channels);
246 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
252 gst_mixer_track_set_property (GObject * object, guint prop_id,
253 const GValue * value, GParamSpec * pspec)
255 GstMixerTrack *mixer_track;
257 mixer_track = GST_MIXER_TRACK (object);
260 case ARG_UNTRANSLATED_LABEL:
261 g_object_set_data_full (G_OBJECT (mixer_track),
262 MIXER_TRACK_OBJECT_DATA_KEY_UNTRANSLATED_LABEL,
263 g_value_dup_string (value), (GDestroyNotify) g_free);
266 g_object_set_data (G_OBJECT (mixer_track),
267 MIXER_TRACK_OBJECT_DATA_KEY_INDEX,
268 GINT_TO_POINTER (g_value_get_uint (value)));
271 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
277 gst_mixer_track_dispose (GObject * object)
279 GstMixerTrack *channel = GST_MIXER_TRACK (object);
281 if (channel->label) {
282 g_free (channel->label);
283 channel->label = NULL;
286 if (parent_class->dispose)
287 parent_class->dispose (object);