mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-19 02:20:20 +00:00
224 lines
6.2 KiB
C
224 lines
6.2 KiB
C
/* GStreamer Color Balance
|
|
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
|
|
*
|
|
* colorbalance.c: image color balance interface design
|
|
* virtual class function wrappers
|
|
*
|
|
* 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 "colorbalance.h"
|
|
#include "interfaces-marshal.h"
|
|
|
|
/**
|
|
* SECTION:gstcolorbalance
|
|
* @short_description: Interface for adjusting color balance settings
|
|
*
|
|
* <refsect2><para>
|
|
* This interface is implemented by elements which can perform some color
|
|
* balance operation on video frames they process. For example, modifying
|
|
* the brightness, contrast, hue or saturation.
|
|
* </para><para>
|
|
* Example elements are 'xvimagesink' and 'colorbalance'
|
|
* </para>
|
|
* </refsect2>
|
|
*/
|
|
|
|
enum
|
|
{
|
|
VALUE_CHANGED,
|
|
LAST_SIGNAL
|
|
};
|
|
|
|
static void gst_color_balance_class_init (GstColorBalanceClass * klass);
|
|
|
|
static guint gst_color_balance_signals[LAST_SIGNAL] = { 0 };
|
|
|
|
GType
|
|
gst_color_balance_get_type (void)
|
|
{
|
|
static GType gst_color_balance_type = 0;
|
|
|
|
if (!gst_color_balance_type) {
|
|
static const GTypeInfo gst_color_balance_info = {
|
|
sizeof (GstColorBalanceClass),
|
|
(GBaseInitFunc) gst_color_balance_class_init,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
0,
|
|
0,
|
|
NULL,
|
|
};
|
|
|
|
gst_color_balance_type = g_type_register_static (G_TYPE_INTERFACE,
|
|
"GstColorBalance", &gst_color_balance_info, 0);
|
|
g_type_interface_add_prerequisite (gst_color_balance_type,
|
|
GST_TYPE_IMPLEMENTS_INTERFACE);
|
|
}
|
|
|
|
return gst_color_balance_type;
|
|
}
|
|
|
|
static void
|
|
gst_color_balance_class_init (GstColorBalanceClass * klass)
|
|
{
|
|
static gboolean initialized = FALSE;
|
|
|
|
if (!initialized) {
|
|
/**
|
|
* GstColorBalance::value-changed:
|
|
* @colorbalance: The GstColorBalance instance
|
|
* @channel: The #GstColorBalanceChannel
|
|
* @value: The new value
|
|
*
|
|
* Fired when the value of the indicated channel has changed.
|
|
*/
|
|
gst_color_balance_signals[VALUE_CHANGED] =
|
|
g_signal_new ("value-changed",
|
|
GST_TYPE_COLOR_BALANCE, G_SIGNAL_RUN_LAST,
|
|
G_STRUCT_OFFSET (GstColorBalanceClass, value_changed),
|
|
NULL, NULL,
|
|
gst_interfaces_marshal_VOID__OBJECT_INT,
|
|
G_TYPE_NONE, 2, GST_TYPE_COLOR_BALANCE_CHANNEL, G_TYPE_INT);
|
|
|
|
initialized = TRUE;
|
|
}
|
|
|
|
klass->balance_type = GST_COLOR_BALANCE_SOFTWARE;
|
|
|
|
/* default virtual functions */
|
|
klass->list_channels = NULL;
|
|
klass->set_value = NULL;
|
|
klass->get_value = NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_color_balance_list_channels:
|
|
* @balance: A #GstColorBalance instance
|
|
*
|
|
* Retrieve a list of the available channels.
|
|
*
|
|
* Returns: A GList containing pointers to #GstColorBalanceChannel objects.
|
|
* The list is owned by the #GstColorBalance instance and must not
|
|
* be freed.
|
|
*/
|
|
const GList *
|
|
gst_color_balance_list_channels (GstColorBalance * balance)
|
|
{
|
|
GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
|
|
|
|
if (klass->list_channels) {
|
|
return klass->list_channels (balance);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_color_balance_set_value:
|
|
* @balance: A #GstColorBalance instance
|
|
* @channel: A #GstColorBalanceChannel instance
|
|
* @value: The new value for the channel.
|
|
*
|
|
* Sets the current value of the channel to the passed value, which must
|
|
* be between min_value and max_value.
|
|
*
|
|
* See Also: The #GstColorBalanceChannel::min_value and
|
|
* #GstColorBalanceChannel::max_value members of the
|
|
* #GstColorBalanceChannel object.
|
|
*/
|
|
void
|
|
gst_color_balance_set_value (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel, gint value)
|
|
{
|
|
GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
|
|
|
|
if (klass->set_value) {
|
|
klass->set_value (balance, channel, value);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_color_balance_get_value:
|
|
* @balance: A #GstColorBalance instance
|
|
* @channel: A #GstColorBalanceChannel instance
|
|
*
|
|
* Retrieve the current value of the indicated channel, between min_value
|
|
* and max_value.
|
|
*
|
|
* See Also: The #GstColorBalanceChannel::min_value and
|
|
* #GstColorBalanceChannel::max_value members of the
|
|
* #GstColorBalanceChannel object.
|
|
*
|
|
* Returns: The current value of the channel.
|
|
*/
|
|
gint
|
|
gst_color_balance_get_value (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel)
|
|
{
|
|
GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
|
|
|
|
if (klass->get_value) {
|
|
return klass->get_value (balance, channel);
|
|
}
|
|
|
|
return channel->min_value;
|
|
}
|
|
|
|
/**
|
|
* gst_color_balance_get_balance_type:
|
|
* @balance: The #GstColorBalance implementation
|
|
*
|
|
* Get the #GstColorBalanceType of this implementation.
|
|
*
|
|
* Returns: A the #GstColorBalanceType.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
GstColorBalanceType
|
|
gst_color_balance_get_balance_type (GstColorBalance * balance)
|
|
{
|
|
GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
|
|
|
|
return klass->balance_type;
|
|
}
|
|
|
|
/**
|
|
* gst_color_balance_value_changed:
|
|
* @balance: A #GstColorBalance instance
|
|
* @channel: A #GstColorBalanceChannel whose value has changed
|
|
* @value: The new value of the channel
|
|
*
|
|
* A helper function called by implementations of the GstColorBalance
|
|
* interface. It fires the #GstColorBalance::value-changed signal on the
|
|
* instance, and the #GstColorBalanceChannel::value-changed signal on the
|
|
* channel object.
|
|
*/
|
|
void
|
|
gst_color_balance_value_changed (GstColorBalance * balance,
|
|
GstColorBalanceChannel * channel, gint value)
|
|
{
|
|
g_signal_emit (G_OBJECT (balance),
|
|
gst_color_balance_signals[VALUE_CHANGED], 0, channel, value);
|
|
|
|
g_signal_emit_by_name (G_OBJECT (channel), "value_changed", value);
|
|
}
|