sys/v4l2/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., 51 Franklin St, Fifth Floor,
  19  * Boston, MA 02110-1301, 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 G_DEFINE_TYPE (GstTunerChannel, gst_tuner_channel, G_TYPE_OBJECT);
  55
  56 static void gst_tuner_channel_dispose (GObject * object);
  57
  58 static guint signals[LAST_SIGNAL] = { 0 };
  59
  60 static void
  61 gst_tuner_channel_class_init (GstTunerChannelClass * klass)
  62 {
  63   GObjectClass *object_klass = (GObjectClass *) klass;
  64
  65   /**
  66    * GstTunerChannel::frequency-changed:
  67    * @tunerchannel: The #GstTunerChannel
  68    * @frequency: The new frequency (an unsigned long)
  69    *
  70    * Reports that the current frequency has changed.
  71    */
  72   signals[SIGNAL_FREQUENCY_CHANGED] =
  73       g_signal_new ("frequency-changed", G_TYPE_FROM_CLASS (klass),
  74       G_SIGNAL_RUN_LAST,
  75       G_STRUCT_OFFSET (GstTunerChannelClass,
  76           frequency_changed),
  77       NULL, NULL, g_cclosure_marshal_VOID__ULONG, G_TYPE_NONE, 1, G_TYPE_ULONG);
  78   /**
  79    * GstTunerChannel::signal-changed:
  80    * @tunerchannel: The #GstTunerChannel
  81    * @signal: The new signal strength (an integer)
  82    *
  83    * Reports that the signal strength has changed.
  84    *
  85    * See Also: gst_tuner_signal_strength()
  86    */
  87   signals[SIGNAL_SIGNAL_CHANGED] =
  88       g_signal_new ("signal-changed", G_TYPE_FROM_CLASS (klass),
  89       G_SIGNAL_RUN_LAST,
  90       G_STRUCT_OFFSET (GstTunerChannelClass,
  91           signal_changed),
  92       NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
  93
  94   object_klass->dispose = gst_tuner_channel_dispose;
  95 }
  96
  97 static void
  98 gst_tuner_channel_init (GstTunerChannel * channel)
  99 {
 100   channel->label = NULL;
 101   channel->flags = 0;
 102   channel->min_frequency = channel->max_frequency = 0;
 103   channel->min_signal = channel->max_signal = 0;
 104 }
 105
 106 static void
 107 gst_tuner_channel_dispose (GObject * object)
 108 {
 109   GstTunerChannel *channel = GST_TUNER_CHANNEL (object);
 110
 111   if (channel->label) {
 112     g_free (channel->label);
 113     channel->label = NULL;
 114   }
 115
 116   G_OBJECT_CLASS (gst_tuner_channel_parent_class)->dispose (object);
 117 }