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);
68 gst_alsa_type_add_device_property_probe_interface (type);
73 gst_alsa_mixer_element_class_init (GstAlsaMixerElementClass * klass)
75 GstElementClass *element_class;
76 GObjectClass *gobject_class;
78 element_class = (GstElementClass *) klass;
79 gobject_class = (GObjectClass *) klass;
81 gobject_class->finalize = gst_alsa_mixer_element_finalize;
82 gobject_class->get_property = gst_alsa_mixer_element_get_property;
83 gobject_class->set_property = gst_alsa_mixer_element_set_property;
85 g_object_class_install_property (gobject_class, PROP_DEVICE,
86 g_param_spec_string ("device", "Device",
87 "ALSA device, as defined in an asound configuration file",
88 DEFAULT_PROP_DEVICE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
90 g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
91 g_param_spec_string ("device-name", "Device name",
92 "Human-readable name of the sound device",
93 DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
95 gst_element_class_set_static_metadata (element_class,
96 "Alsa mixer", "Generic/Audio",
97 "Control sound input and output levels with ALSA",
98 "Leif Johnson <leif@ambient.2y.net>");
100 element_class->change_state =
101 GST_DEBUG_FUNCPTR (gst_alsa_mixer_element_change_state);
105 gst_alsa_mixer_element_finalize (GObject * obj)
107 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (obj);
109 g_free (this->device);
111 G_OBJECT_CLASS (parent_class)->finalize (obj);
115 gst_alsa_mixer_element_init (GstAlsaMixerElement * this)
118 this->device = g_strdup (DEFAULT_PROP_DEVICE);
122 gst_alsa_mixer_element_set_property (GObject * object, guint prop_id,
123 const GValue * value, GParamSpec * pspec)
125 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
129 GST_OBJECT_LOCK (this);
130 g_free (this->device);
131 this->device = g_value_dup_string (value);
132 /* make sure we never set NULL, this is nice when we want to open the
134 if (this->device == NULL)
135 this->device = g_strdup (DEFAULT_PROP_DEVICE);
136 GST_OBJECT_UNLOCK (this);
140 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
146 gst_alsa_mixer_element_get_property (GObject * object, guint prop_id,
147 GValue * value, GParamSpec * pspec)
149 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
153 GST_OBJECT_LOCK (this);
154 g_value_set_string (value, this->device);
155 GST_OBJECT_UNLOCK (this);
158 case PROP_DEVICE_NAME:{
159 GST_OBJECT_LOCK (this);
161 g_value_set_string (value, this->mixer->cardname);
163 g_value_set_string (value, NULL);
165 GST_OBJECT_UNLOCK (this);
169 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
174 static GstStateChangeReturn
175 gst_alsa_mixer_element_change_state (GstElement * element,
176 GstStateChange transition)
178 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
179 GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (element);
181 switch (transition) {
182 case GST_STATE_CHANGE_NULL_TO_READY:
184 this->mixer = gst_alsa_mixer_new (this->device, GST_ALSA_MIXER_ALL);
187 _gst_alsa_mixer_set_interface (this->mixer, GST_MIXER (element));
194 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
195 if (ret == GST_STATE_CHANGE_FAILURE)
198 switch (transition) {
199 case GST_STATE_CHANGE_READY_TO_NULL:
201 gst_alsa_mixer_free (this->mixer);
214 GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ_WRITE, (NULL),
215 ("Failed to open alsa mixer device '%s'", this->device));
216 return GST_STATE_CHANGE_FAILURE;