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);
39 #define gst_alsa_mixer_element_parent_class parent_class
40 G_DEFINE_TYPE_WITH_CODE (GstAlsaMixerElement, gst_alsa_mixer_element,
42 gst_alsa_mixer_element_init_interfaces (g_define_type_id));
44 /* massive macro that takes care of all the GstMixer stuff */
45 GST_IMPLEMENT_ALSA_MIXER_METHODS (GstAlsaMixerElement, gst_alsa_mixer_element);
47 static void gst_alsa_mixer_element_get_property (GObject * object,
48 guint prop_id, GValue * value, GParamSpec * pspec);
49 static void gst_alsa_mixer_element_set_property (GObject * object,
50 guint prop_id, const GValue * value, GParamSpec * pspec);
51 static void gst_alsa_mixer_element_finalize (GObject * object);
53 static GstStateChangeReturn gst_alsa_mixer_element_change_state (GstElement
54 * element, GstStateChange transition);
57 gst_alsa_mixer_element_init_interfaces (GType type)
59 static const GInterfaceInfo mixer_iface_info = {
60 (GInterfaceInitFunc) gst_alsa_mixer_element_interface_init,
65 g_type_add_interface_static (type, GST_TYPE_MIXER, &mixer_iface_info);
67 gst_alsa_type_add_device_property_probe_interface (type);
71 gst_alsa_mixer_element_class_init (GstAlsaMixerElementClass * klass)
73 GstElementClass *element_class;
74 GObjectClass *gobject_class;
76 element_class = (GstElementClass *) klass;
77 gobject_class = (GObjectClass *) klass;
79 gobject_class->finalize = gst_alsa_mixer_element_finalize;
80 gobject_class->get_property = gst_alsa_mixer_element_get_property;
81 gobject_class->set_property = gst_alsa_mixer_element_set_property;
83 g_object_class_install_property (gobject_class, PROP_DEVICE,
84 g_param_spec_string ("device", "Device",
85 "ALSA device, as defined in an asound configuration file",
86 DEFAULT_PROP_DEVICE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
88 g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
89 g_param_spec_string ("device-name", "Device name",
90 "Human-readable name of the sound device",
91 DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
93 gst_element_class_set_details_simple (element_class,
94 "Alsa mixer", "Generic/Audio",
95 "Control sound input and output levels with ALSA",
96 "Leif Johnson <leif@ambient.2y.net>");
98 element_class->change_state =
99 GST_DEBUG_FUNCPTR (gst_alsa_mixer_element_change_state);
103 gst_alsa_mixer_element_finalize (GObject * obj)
105 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (obj);
107 g_free (this->device);
109 G_OBJECT_CLASS (parent_class)->finalize (obj);
113 gst_alsa_mixer_element_init (GstAlsaMixerElement * this)
116 this->device = g_strdup (DEFAULT_PROP_DEVICE);
120 gst_alsa_mixer_element_set_property (GObject * object, guint prop_id,
121 const GValue * value, GParamSpec * pspec)
123 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
127 GST_OBJECT_LOCK (this);
128 g_free (this->device);
129 this->device = g_value_dup_string (value);
130 /* make sure we never set NULL, this is nice when we want to open the
132 if (this->device == NULL)
133 this->device = g_strdup (DEFAULT_PROP_DEVICE);
134 GST_OBJECT_UNLOCK (this);
138 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
144 gst_alsa_mixer_element_get_property (GObject * object, guint prop_id,
145 GValue * value, GParamSpec * pspec)
147 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
151 GST_OBJECT_LOCK (this);
152 g_value_set_string (value, this->device);
153 GST_OBJECT_UNLOCK (this);
156 case PROP_DEVICE_NAME:{
157 GST_OBJECT_LOCK (this);
159 g_value_set_string (value, this->mixer->cardname);
161 g_value_set_string (value, NULL);
163 GST_OBJECT_UNLOCK (this);
167 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
172 static GstStateChangeReturn
173 gst_alsa_mixer_element_change_state (GstElement * element,
174 GstStateChange transition)
176 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
177 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (element);
179 switch (transition) {
180 case GST_STATE_CHANGE_NULL_TO_READY:
182 this->mixer = gst_alsa_mixer_new (this->device, GST_ALSA_MIXER_ALL);
185 _gst_alsa_mixer_set_interface (this->mixer, GST_MIXER (element));
192 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
193 if (ret == GST_STATE_CHANGE_FAILURE)
196 switch (transition) {
197 case GST_STATE_CHANGE_READY_TO_NULL:
199 gst_alsa_mixer_free (this->mixer);
212 GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ_WRITE, (NULL),
213 ("Failed to open alsa mixer device '%s'", this->device));
214 return GST_STATE_CHANGE_FAILURE;