Added gst-plugins-base-subtitles0.10-0.10.34 for Meego Harmattan 1.2
[mafwsubrenderer] / gst-plugins-base-subtitles0.10 / sys / v4l / gstv4lcolorbalance.c
1 /* GStreamer
2  *
3  * gstv4lcolorbalance.c: color balance interface implementation for V4L
4  *
5  * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Library General Public
9  * License as published by the Free Software Foundation; either
10  * version 2 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Library General Public License for more details.
16  *
17  * You should have received a copy of the GNU Library General Public
18  * License along with this library; if not, write to the
19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20  * Boston, MA 02111-1307, USA.
21  */
22
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include <gst/gst.h>
28 #include "gstv4lcolorbalance.h"
29 #include "gstv4lelement.h"
30
31 static void
32 gst_v4l_color_balance_channel_class_init (GstV4lColorBalanceChannelClass *
33     klass);
34 static void gst_v4l_color_balance_channel_init (GstV4lColorBalanceChannel *
35     channel);
36
37 static const GList *gst_v4l_color_balance_list_channels (GstColorBalance *
38     balance);
39 static void gst_v4l_color_balance_set_value (GstColorBalance * balance,
40     GstColorBalanceChannel * channel, gint value);
41 static gint gst_v4l_color_balance_get_value (GstColorBalance * balance,
42     GstColorBalanceChannel * channel);
43
44 static GstColorBalanceChannelClass *parent_class = NULL;
45
46 GType
47 gst_v4l_color_balance_channel_get_type (void)
48 {
49   static GType gst_v4l_color_balance_channel_type = 0;
50
51   if (!gst_v4l_color_balance_channel_type) {
52     static const GTypeInfo v4l_tuner_channel_info = {
53       sizeof (GstV4lColorBalanceChannelClass),
54       NULL,
55       NULL,
56       (GClassInitFunc) gst_v4l_color_balance_channel_class_init,
57       NULL,
58       NULL,
59       sizeof (GstV4lColorBalanceChannel),
60       0,
61       (GInstanceInitFunc) gst_v4l_color_balance_channel_init,
62       NULL
63     };
64
65     gst_v4l_color_balance_channel_type =
66         g_type_register_static (GST_TYPE_COLOR_BALANCE_CHANNEL,
67         "GstV4lColorBalanceChannel", &v4l_tuner_channel_info, 0);
68   }
69
70   return gst_v4l_color_balance_channel_type;
71 }
72
73 static void
74 gst_v4l_color_balance_channel_class_init (GstV4lColorBalanceChannelClass *
75     klass)
76 {
77   parent_class = g_type_class_peek_parent (klass);
78 }
79
80 static void
81 gst_v4l_color_balance_channel_init (GstV4lColorBalanceChannel * channel)
82 {
83   channel->index = 0;
84 }
85
86 void
87 gst_v4l_color_balance_interface_init (GstColorBalanceClass * klass)
88 {
89   GST_COLOR_BALANCE_TYPE (klass) = GST_COLOR_BALANCE_HARDWARE;
90
91   /* default virtual functions */
92   klass->list_channels = gst_v4l_color_balance_list_channels;
93   klass->set_value = gst_v4l_color_balance_set_value;
94   klass->get_value = gst_v4l_color_balance_get_value;
95 }
96
97 static G_GNUC_UNUSED gboolean
98 gst_v4l_color_balance_contains_channel (GstV4lElement * v4lelement,
99     GstV4lColorBalanceChannel * v4lchannel)
100 {
101   const GList *item;
102
103   for (item = v4lelement->colors; item != NULL; item = item->next)
104     if (item->data == v4lchannel)
105       return TRUE;
106
107   return FALSE;
108 }
109
110 static const GList *
111 gst_v4l_color_balance_list_channels (GstColorBalance * balance)
112 {
113   return GST_V4LELEMENT (balance)->colors;
114 }
115
116 static void
117 gst_v4l_color_balance_set_value (GstColorBalance * balance,
118     GstColorBalanceChannel * channel, gint value)
119 {
120   GstV4lElement *v4lelement = GST_V4LELEMENT (balance);
121   GstV4lColorBalanceChannel *v4lchannel =
122       GST_V4L_COLOR_BALANCE_CHANNEL (channel);
123
124   /* assert that we're opened and that we're using a known item */
125   g_return_if_fail (GST_V4L_IS_OPEN (v4lelement));
126   g_return_if_fail (gst_v4l_color_balance_contains_channel (v4lelement,
127           v4lchannel));
128
129   gst_v4l_set_picture (v4lelement, v4lchannel->index, value);
130 }
131
132 static gint
133 gst_v4l_color_balance_get_value (GstColorBalance * balance,
134     GstColorBalanceChannel * channel)
135 {
136   GstV4lElement *v4lelement = GST_V4LELEMENT (balance);
137   GstV4lColorBalanceChannel *v4lchannel =
138       GST_V4L_COLOR_BALANCE_CHANNEL (channel);
139   gint value;
140
141   /* assert that we're opened and that we're using a known item */
142   g_return_val_if_fail (GST_V4L_IS_OPEN (v4lelement), 0);
143   g_return_val_if_fail (gst_v4l_color_balance_contains_channel (v4lelement,
144           v4lchannel), 0);
145
146   if (!gst_v4l_get_picture (v4lelement, v4lchannel->index, &value))
147     return 0;
148
149   return value;
150 }