+/* ALSA mixer implementation.
+ * Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstalsamixerelement.h"
+#include "gstalsadeviceprobe.h"
+
+#define DEFAULT_PROP_DEVICE "default"
+#define DEFAULT_PROP_DEVICE_NAME ""
+
+enum
+{
+ PROP_0,
+ PROP_DEVICE,
+ PROP_DEVICE_NAME
+};
+
+static void gst_alsa_mixer_element_init_interfaces (GType type);
+
+GST_BOILERPLATE_FULL (GstAlsaMixerElement, gst_alsa_mixer_element,
+ GstElement, GST_TYPE_ELEMENT, gst_alsa_mixer_element_init_interfaces);
+
+/* massive macro that takes care of all the GstMixer stuff */
+GST_IMPLEMENT_ALSA_MIXER_METHODS (GstAlsaMixerElement, gst_alsa_mixer_element);
+
+static void gst_alsa_mixer_element_get_property (GObject * object,
+ guint prop_id, GValue * value, GParamSpec * pspec);
+static void gst_alsa_mixer_element_set_property (GObject * object,
+ guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_alsa_mixer_element_finalize (GObject * object);
+
+static GstStateChangeReturn gst_alsa_mixer_element_change_state (GstElement
+ * element, GstStateChange transition);
+
+static gboolean
+gst_alsa_mixer_element_interface_supported (GstAlsaMixerElement * this,
+ GType interface_type)
+{
+ if (interface_type == GST_TYPE_MIXER) {
+ return gst_alsa_mixer_element_supported (this, interface_type);
+ }
+
+ g_return_val_if_reached (FALSE);
+}
+
+static void
+gst_implements_interface_init (GstImplementsInterfaceClass * klass)
+{
+ klass->supported = (gpointer) gst_alsa_mixer_element_interface_supported;
+}
+
+static void
+gst_alsa_mixer_element_init_interfaces (GType type)
+{
+ static const GInterfaceInfo implements_iface_info = {
+ (GInterfaceInitFunc) gst_implements_interface_init,
+ NULL,
+ NULL,
+ };
+ static const GInterfaceInfo mixer_iface_info = {
+ (GInterfaceInitFunc) gst_alsa_mixer_element_interface_init,
+ NULL,
+ NULL,
+ };
+
+ g_type_add_interface_static (type, GST_TYPE_IMPLEMENTS_INTERFACE,
+ &implements_iface_info);
+ g_type_add_interface_static (type, GST_TYPE_MIXER, &mixer_iface_info);
+
+ gst_alsa_type_add_device_property_probe_interface (type);
+}
+
+static void
+gst_alsa_mixer_element_base_init (gpointer klass)
+{
+ gst_element_class_set_details_simple (GST_ELEMENT_CLASS (klass),
+ "Alsa mixer", "Generic/Audio",
+ "Control sound input and output levels with ALSA",
+ "Leif Johnson <leif@ambient.2y.net>");
+}
+
+static void
+gst_alsa_mixer_element_class_init (GstAlsaMixerElementClass * klass)
+{
+ GstElementClass *element_class;
+ GObjectClass *gobject_class;
+
+ element_class = (GstElementClass *) klass;
+ gobject_class = (GObjectClass *) klass;
+
+ gobject_class->finalize = gst_alsa_mixer_element_finalize;
+ gobject_class->get_property = gst_alsa_mixer_element_get_property;
+ gobject_class->set_property = gst_alsa_mixer_element_set_property;
+
+ g_object_class_install_property (gobject_class, PROP_DEVICE,
+ g_param_spec_string ("device", "Device",
+ "ALSA device, as defined in an asound configuration file",
+ DEFAULT_PROP_DEVICE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
+ g_param_spec_string ("device-name", "Device name",
+ "Human-readable name of the sound device",
+ DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
+ element_class->change_state =
+ GST_DEBUG_FUNCPTR (gst_alsa_mixer_element_change_state);
+}
+
+static void
+gst_alsa_mixer_element_finalize (GObject * obj)
+{
+ GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (obj);
+
+ g_free (this->device);
+
+ G_OBJECT_CLASS (parent_class)->finalize (obj);
+}
+
+static void
+gst_alsa_mixer_element_init (GstAlsaMixerElement * this,
+ GstAlsaMixerElementClass * klass)
+{
+ this->mixer = NULL;
+ this->device = g_strdup (DEFAULT_PROP_DEVICE);
+}
+
+static void
+gst_alsa_mixer_element_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
+
+ switch (prop_id) {
+ case PROP_DEVICE:{
+ GST_OBJECT_LOCK (this);
+ g_free (this->device);
+ this->device = g_value_dup_string (value);
+ /* make sure we never set NULL, this is nice when we want to open the
+ * device. */
+ if (this->device == NULL)
+ this->device = g_strdup (DEFAULT_PROP_DEVICE);
+ GST_OBJECT_UNLOCK (this);
+ break;
+ }
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_alsa_mixer_element_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (object);
+
+ switch (prop_id) {
+ case PROP_DEVICE:{
+ GST_OBJECT_LOCK (this);
+ g_value_set_string (value, this->device);
+ GST_OBJECT_UNLOCK (this);
+ break;
+ }
+ case PROP_DEVICE_NAME:{
+ GST_OBJECT_LOCK (this);
+ if (this->mixer) {
+ g_value_set_string (value, this->mixer->cardname);
+ } else {
+ g_value_set_string (value, NULL);
+ }
+ GST_OBJECT_UNLOCK (this);
+ break;
+ }
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static GstStateChangeReturn
+gst_alsa_mixer_element_change_state (GstElement * element,
+ GstStateChange transition)
+{
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+ GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (element);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_NULL_TO_READY:
+ if (!this->mixer) {
+ this->mixer = gst_alsa_mixer_new (this->device, GST_ALSA_MIXER_ALL);
+ if (!this->mixer)
+ goto open_failed;
+ _gst_alsa_mixer_set_interface (this->mixer, GST_MIXER (element));
+ }
+ break;
+ default:
+ break;
+ }
+
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ return ret;
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_NULL:
+ if (this->mixer) {
+ gst_alsa_mixer_free (this->mixer);
+ this->mixer = NULL;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+
+ /* ERRORS */
+open_failed:
+ {
+ GST_ELEMENT_ERROR (element, RESOURCE, OPEN_READ_WRITE, (NULL),
+ ("Failed to open alsa mixer device '%s'", this->device));
+ return GST_STATE_CHANGE_FAILURE;
+ }
+}
projects / mafwsubrenderer / blobdiff