mobile/gst-libs/gst/interfaces/tunerchannel.c

   1 /* GStreamer Tuner
   2  * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
   3  *
   4  * tunerchannel.c: tuner channel object design
   5  *
   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.
  10  *
  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.
  15  *
  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.
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "tunerchannel.h"
  27
  28 /**
  29  * SECTION:gsttunerchannel
  30  * @short_description: A channel from an element implementing the #GstTuner
  31  * interface.
  32  *
  33  * <refsect2>
  34  * <para>The #GstTunerChannel object is provided by an element implementing
  35  * the #GstTuner interface.
  36  * </para>
  37  * <para>
  38  * GstTunerChannel provides a name and flags to determine the type and
  39  * capabilities of the channel. If the GST_TUNER_CHANNEL_FREQUENCY flag is
  40  * set, then the channel also information about the minimum and maximum
  41  * frequency, and range of the reported signal strength.
  42  * </para>
  43  * </refsect2>
  44  */
  45
  46 enum
  47 {
  48   /* FILL ME */
  49   SIGNAL_FREQUENCY_CHANGED,
  50   SIGNAL_SIGNAL_CHANGED,
  51   LAST_SIGNAL
  52 };
  53
  54 static void gst_tuner_channel_class_init (GstTunerChannelClass * klass);
  55 static void gst_tuner_channel_init (GstTunerChannel * channel);
  56 static void gst_tuner_channel_dispose (GObject * object);
  57
  58 static GObjectClass *parent_class = NULL;
  59 static guint signals[LAST_SIGNAL] = { 0 };
  60
  61 GType
  62 gst_tuner_channel_get_type (void)
  63 {
  64   static GType gst_tuner_channel_type = 0;
  65
  66   if (!gst_tuner_channel_type) {
  67     static const GTypeInfo tuner_channel_info = {
  68       sizeof (GstTunerChannelClass),
  69       NULL,
  70       NULL,
  71       (GClassInitFunc) gst_tuner_channel_class_init,
  72       NULL,
  73       NULL,
  74       sizeof (GstTunerChannel),
  75       0,
  76       (GInstanceInitFunc) gst_tuner_channel_init,
  77       NULL
  78     };
  79
  80     gst_tuner_channel_type =
  81         g_type_register_static (G_TYPE_OBJECT,
  82         "GstTunerChannel", &tuner_channel_info, 0);
  83   }
  84
  85   return gst_tuner_channel_type;
  86 }
  87
  88 static void
  89 gst_tuner_channel_class_init (GstTunerChannelClass * klass)
  90 {
  91   GObjectClass *object_klass = (GObjectClass *) klass;
  92
  93   parent_class = g_type_class_peek_parent (klass);
  94
  95   /**
  96    * GstTunerChannel::frequency-changed:
  97    * @tunerchannel: The #GstTunerChannel
  98    * @frequency: The new frequency (an unsigned long)
  99    *
 100    * Reports that the current frequency has changed.
 101    */
 102   signals[SIGNAL_FREQUENCY_CHANGED] =
 103       g_signal_new ("frequency-changed", G_TYPE_FROM_CLASS (klass),
 104       G_SIGNAL_RUN_LAST,
 105       G_STRUCT_OFFSET (GstTunerChannelClass,
 106           frequency_changed),
 107       NULL, NULL, g_cclosure_marshal_VOID__ULONG, G_TYPE_NONE, 1, G_TYPE_ULONG);
 108   /**
 109    * GstTunerChannel::signal-changed:
 110    * @tunerchannel: The #GstTunerChannel
 111    * @signal: The new signal strength (an integer)
 112    *
 113    * Reports that the signal strength has changed.
 114    *
 115    * See Also: gst_tuner_signal_strength()
 116    */
 117   signals[SIGNAL_SIGNAL_CHANGED] =
 118       g_signal_new ("signal-changed", G_TYPE_FROM_CLASS (klass),
 119       G_SIGNAL_RUN_LAST,
 120       G_STRUCT_OFFSET (GstTunerChannelClass,
 121           signal_changed),
 122       NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 123
 124   object_klass->dispose = gst_tuner_channel_dispose;
 125 }
 126
 127 static void
 128 gst_tuner_channel_init (GstTunerChannel * channel)
 129 {
 130   channel->label = NULL;
 131   channel->flags = 0;
 132   channel->min_frequency = channel->max_frequency = 0;
 133   channel->min_signal = channel->max_signal = 0;
 134 }
 135
 136 static void
 137 gst_tuner_channel_dispose (GObject * object)
 138 {
 139   GstTunerChannel *channel = GST_TUNER_CHANNEL (object);
 140
 141   if (channel->label) {
 142     g_free (channel->label);
 143     channel->label = NULL;
 144   }
 145
 146   if (parent_class->dispose)
 147     parent_class->dispose (object);
 148 }