mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-09 05:38:58 +00:00
126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* GStreamer Color Balance interface implementation
|
|
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
|
|
*
|
|
* gstv4l2colorbalance.c: color balance interface implementation for V4L2
|
|
*
|
|
* 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 <gst/gst.h>
|
|
#include "gstv4l2colorbalance.h"
|
|
#include "gstv4l2element.h"
|
|
|
|
static const GList *gst_v4l2_color_balance_list_channels (GstColorBalance *
|
|
balance);
|
|
static void gst_v4l2_color_balance_set_value (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel, gint value);
|
|
static gint gst_v4l2_color_balance_get_value (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel);
|
|
|
|
|
|
GST_BOILERPLATE (GstV4l2ColorBalanceChannel,
|
|
gst_v4l2_color_balance_channel,
|
|
GstColorBalanceChannel, GST_TYPE_COLOR_BALANCE_CHANNEL);
|
|
|
|
|
|
static void
|
|
gst_v4l2_color_balance_channel_base_init (gpointer g_class)
|
|
{
|
|
}
|
|
|
|
|
|
static void
|
|
gst_v4l2_color_balance_channel_class_init (GstV4l2ColorBalanceChannelClass *
|
|
klass)
|
|
{
|
|
}
|
|
|
|
static void
|
|
gst_v4l2_color_balance_channel_init (GstV4l2ColorBalanceChannel * channel,
|
|
GstV4l2ColorBalanceChannelClass * klass)
|
|
{
|
|
channel->id = (guint32) - 1;
|
|
}
|
|
|
|
void
|
|
gst_v4l2_color_balance_interface_init (GstColorBalanceClass * klass)
|
|
{
|
|
GST_COLOR_BALANCE_TYPE (klass) = GST_COLOR_BALANCE_HARDWARE;
|
|
|
|
/* default virtual functions */
|
|
klass->list_channels = gst_v4l2_color_balance_list_channels;
|
|
klass->set_value = gst_v4l2_color_balance_set_value;
|
|
klass->get_value = gst_v4l2_color_balance_get_value;
|
|
}
|
|
|
|
static G_GNUC_UNUSED gboolean
|
|
gst_v4l2_color_balance_contains_channel (GstV4l2Element * v4l2element,
|
|
GstV4l2ColorBalanceChannel * v4l2channel)
|
|
{
|
|
const GList *item;
|
|
|
|
for (item = v4l2element->colors; item != NULL; item = item->next)
|
|
if (item->data == v4l2channel)
|
|
return TRUE;
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static const GList *
|
|
gst_v4l2_color_balance_list_channels (GstColorBalance * balance)
|
|
{
|
|
return GST_V4L2ELEMENT (balance)->colors;
|
|
}
|
|
|
|
static void
|
|
gst_v4l2_color_balance_set_value (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel, gint value)
|
|
{
|
|
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (balance);
|
|
GstV4l2ColorBalanceChannel *v4l2channel =
|
|
GST_V4L2_COLOR_BALANCE_CHANNEL (channel);
|
|
|
|
/* assert that we're opened and that we're using a known item */
|
|
g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
|
|
g_return_if_fail (gst_v4l2_color_balance_contains_channel (v4l2element,
|
|
v4l2channel));
|
|
|
|
gst_v4l2_set_attribute (v4l2element, v4l2channel->id, value);
|
|
}
|
|
|
|
static gint
|
|
gst_v4l2_color_balance_get_value (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel)
|
|
{
|
|
GstV4l2Element *v4l2element = GST_V4L2ELEMENT (balance);
|
|
GstV4l2ColorBalanceChannel *v4l2channel =
|
|
GST_V4L2_COLOR_BALANCE_CHANNEL (channel);
|
|
gint value;
|
|
|
|
/* assert that we're opened and that we're using a known item */
|
|
g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
|
|
g_return_val_if_fail (gst_v4l2_color_balance_contains_channel (v4l2element,
|
|
v4l2channel), 0);
|
|
|
|
if (!gst_v4l2_get_attribute (v4l2element, v4l2channel->id, &value))
|
|
return 0;
|
|
|
|
return value;
|
|
}
|