1 /* ALSA mixer implementation.
2 * Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
25 #include "gstalsamixerelement.h"
26 #include "gstalsadeviceprobe.h"
28 #define DEFAULT_PROP_DEVICE "default"
29 #define DEFAULT_PROP_DEVICE_NAME ""
38 static void gst_alsa_mixer_element_init_interfaces (GType type);
40 GST_BOILERPLATE_FULL (GstAlsaMixerElement, gst_alsa_mixer_element,
41 GstElement, GST_TYPE_ELEMENT, gst_alsa_mixer_element_init_interfaces);
43 /* massive macro that takes care of all the GstMixer stuff */
44 GST_IMPLEMENT_ALSA_MIXER_METHODS (GstAlsaMixerElement, gst_alsa_mixer_element);
46 static void gst_alsa_mixer_element_get_property (GObject * object,
47 guint prop_id, GValue * value, GParamSpec * pspec);
48 static void gst_alsa_mixer_element_set_property (GObject * object,
49 guint prop_id, const GValue * value, GParamSpec * pspec);
50 static void gst_alsa_mixer_element_finalize (GObject * object);
52 static GstStateChangeReturn gst_alsa_mixer_element_change_state (GstElement
53 * element, GstStateChange transition);
56 gst_alsa_mixer_element_interface_supported (GstAlsaMixerElement * this,
59 if (interface_type == GST_TYPE_MIXER) {
60 return gst_alsa_mixer_element_supported (this, interface_type);
63 g_return_val_if_reached (FALSE);
67 gst_implements_interface_init (GstImplementsInterfaceClass * klass)
69 klass->supported = (gpointer) gst_alsa_mixer_element_interface_supported;
73 gst_alsa_mixer_element_init_interfaces (GType type)
75 static const GInterfaceInfo implements_iface_info = {
76 (GInterfaceInitFunc) gst_implements_interface_init,
80 static const GInterfaceInfo mixer_iface_info = {
81 (GInterfaceInitFunc) gst_alsa_mixer_element_interface_init,
86 g_type_add_interface_static (type, GST_TYPE_IMPLEMENTS_INTERFACE,
87 &implements_iface_info);
88 g_type_add_interface_static (type, GST_TYPE_MIXER, &mixer_iface_info);
90 gst_alsa_type_add_device_property_probe_interface (type);
94 gst_alsa_mixer_element_base_init (gpointer klass)
96 gst_element_class_set_details_simple (GST_ELEMENT_CLASS (klass),
97 "Alsa mixer", "Generic/Audio",
98 "Control sound input and output levels with ALSA",
99 "Leif Johnson <leif@ambient.2y.net>");
103 gst_alsa_mixer_element_class_init (GstAlsaMixerElementClass * klass)
105 GstElementClass *element_class;
106 GObjectClass *gobject_class;
108 element_class = (GstElementClass *) klass;
109 gobject_class = (GObjectClass *) klass;
111 gobject_class->finalize = gst_alsa_mixer_element_finalize;
112 gobject_class->get_property = gst_alsa_mixer_element_get_property;
113 gobject_class->set_property = gst_alsa_mixer_element_set_property;
115 g_object_class_install_property (gobject_class, PROP_DEVICE,
116 g_param_spec_string ("device", "Device",
117 "ALSA device, as defined in an asound configuration file",
118 DEFAULT_PROP_DEVICE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
120 g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
121 g_param_spec_string ("device-name", "Device name",
122 "Human-readable name of the sound device",
123 DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
125 element_class->change_state =
126 GST_DEBUG_FUNCPTR (gst_alsa_mixer_element_change_state);
130 gst_alsa_mixer_element_finalize (GObject * obj)
132 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (obj);
134 g_free (this->device);
136 G_OBJECT_CLASS (parent_class)->finalize (obj);
140 gst_alsa_mixer_element_init (GstAlsaMixerElement * this,
141 GstAlsaMixerElementClass * klass)
144 this->device = g_strdup (DEFAULT_PROP_DEVICE);
148 gst_alsa_mixer_element_set_property (GObject * object, guint prop_id,
149 const GValue * value, GParamSpec * pspec)
151 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
155 GST_OBJECT_LOCK (this);
156 g_free (this->device);
157 this->device = g_value_dup_string (value);
158 /* make sure we never set NULL, this is nice when we want to open the
160 if (this->device == NULL)
161 this->device = g_strdup (DEFAULT_PROP_DEVICE);
162 GST_OBJECT_UNLOCK (this);
166 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
172 gst_alsa_mixer_element_get_property (GObject * object, guint prop_id,
173 GValue * value, GParamSpec * pspec)
175 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
179 GST_OBJECT_LOCK (this);
180 g_value_set_string (value, this->device);
181 GST_OBJECT_UNLOCK (this);
184 case PROP_DEVICE_NAME:{
185 GST_OBJECT_LOCK (this);
187 g_value_set_string (value, this->mixer->cardname);
189 g_value_set_string (value, NULL);
191 GST_OBJECT_UNLOCK (this);
195 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
200 static GstStateChangeReturn
201 gst_alsa_mixer_element_change_state (GstElement * element,
202 GstStateChange transition)
204 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
205 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (element);
207 switch (transition) {
208 case GST_STATE_CHANGE_NULL_TO_READY:
210 this->mixer = gst_alsa_mixer_new (this->device, GST_ALSA_MIXER_ALL);
213 _gst_alsa_mixer_set_interface (this->mixer, GST_MIXER (element));
220 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
221 if (ret == GST_STATE_CHANGE_FAILURE)
224 switch (transition) {
225 case GST_STATE_CHANGE_READY_TO_NULL:
227 gst_alsa_mixer_free (this->mixer);
240 GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ_WRITE, (NULL),
241 ("Failed to open alsa mixer device '%s'", this->device));
242 return GST_STATE_CHANGE_FAILURE;