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862d28a1b7
Original commit message from CVS: Some interface implementations for video4linux/video4linux2 plugins: * a Tuner interface, with which one can select inputs and stations. Audio work is underway here, but unfinished. * A Xoverlay interface with which one can do simple overlay. Similar to the API of the v4l/Xv XFree86 extension. Widget implementation for GTK-2.0 coming up in the sandbox. * Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty basic and maybe somewhat overdesigned. But it'll do for now. Apart from these interfaces, there's also a loadable library 'xwindowlistener' that listenes to X for the movement of a window and the overlap of other windows. This is partly copied from xawtv (and thus partly GPL :(), but it's needed for the xoverlay interface implementation in the v4l/v4l2 elements. Lastly, some small changes to remove redundant properties from the v4l/v4l2 elements since these can be done much simpler. Comments appreciated!
151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/* GStreamer Color Balance interface implementation
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* gstv4l2colorbalance.c: color balance interface implementation for V4L2
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include "gstv4l2colorbalance.h"
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#include "gstv4l2element.h"
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static void
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gst_v4l2_color_balance_channel_class_init(GstV4l2ColorBalanceChannelClass *klass);
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static void
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gst_v4l2_color_balance_channel_init (GstV4l2ColorBalanceChannel *channel);
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static const GList *
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gst_v4l2_color_balance_list_channels (GstColorBalance *balance);
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static void
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gst_v4l2_color_balance_set_value (GstColorBalance *balance,
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GstColorBalanceChannel *channel,
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gint value);
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static gint
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gst_v4l2_color_balance_get_value (GstColorBalance *balance,
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GstColorBalanceChannel *channel);
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static GstColorBalanceChannelClass *parent_class = NULL;
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GType
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gst_v4l2_color_balance_channel_get_type (void)
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{
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static GType gst_v4l2_color_balance_channel_type = 0;
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if (!gst_v4l2_color_balance_channel_type) {
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static const GTypeInfo v4l2_tuner_channel_info = {
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sizeof (GstV4l2ColorBalanceChannelClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_v4l2_color_balance_channel_class_init,
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NULL,
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NULL,
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sizeof (GstV4l2ColorBalanceChannel),
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0,
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(GInstanceInitFunc) gst_v4l2_color_balance_channel_init,
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NULL
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};
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gst_v4l2_color_balance_channel_type =
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g_type_register_static (GST_TYPE_COLOR_BALANCE_CHANNEL,
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"GstV4l2ColorBalanceChannel",
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&v4l2_tuner_channel_info, 0);
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}
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return gst_v4l2_color_balance_channel_type;
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}
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static void
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gst_v4l2_color_balance_channel_class_init (GstV4l2ColorBalanceChannelClass *klass)
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{
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parent_class = g_type_class_ref (GST_TYPE_COLOR_BALANCE_CHANNEL);
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}
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static void
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gst_v4l2_color_balance_channel_init (GstV4l2ColorBalanceChannel *channel)
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{
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channel->index = 0;
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}
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void
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gst_v4l2_color_balance_interface_init (GstColorBalanceClass *klass)
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{
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/* default virtual functions */
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klass->list_channels = gst_v4l2_color_balance_list_channels;
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klass->set_value = gst_v4l2_color_balance_set_value;
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klass->get_value = gst_v4l2_color_balance_get_value;
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}
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static gboolean
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gst_v4l2_color_balance_contains_channel (GstV4l2Element *v4l2element,
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GstV4l2ColorBalanceChannel *v4l2channel)
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{
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const GList *item;
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for (item = v4l2element->colors; item != NULL; item = item->next)
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if (item->data == v4l2channel)
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return TRUE;
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return FALSE;
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}
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static const GList *
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gst_v4l2_color_balance_list_channels (GstColorBalance *balance)
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{
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return GST_V4L2ELEMENT (balance)->colors;
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}
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static void
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gst_v4l2_color_balance_set_value (GstColorBalance *balance,
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GstColorBalanceChannel *channel,
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gint value)
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{
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GstV4l2Element *v4l2element = GST_V4L2ELEMENT (balance);
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GstV4l2ColorBalanceChannel *v4l2channel =
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GST_V4L2_COLOR_BALANCE_CHANNEL (channel);
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/* assert that we're opened and that we're using a known item */
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g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
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g_return_if_fail (gst_v4l2_color_balance_contains_channel (v4l2element,
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v4l2channel));
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gst_v4l2_set_attribute (v4l2element, v4l2channel->index, value);
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}
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static gint
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gst_v4l2_color_balance_get_value (GstColorBalance *balance,
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GstColorBalanceChannel *channel)
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{
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GstV4l2Element *v4l2element = GST_V4L2ELEMENT (balance);
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GstV4l2ColorBalanceChannel *v4l2channel =
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GST_V4L2_COLOR_BALANCE_CHANNEL (channel);
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gint value;
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/* assert that we're opened and that we're using a known item */
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g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
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g_return_val_if_fail (gst_v4l2_color_balance_contains_channel (v4l2element,
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v4l2channel),
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0);
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if (!gst_v4l2_get_attribute (v4l2element, v4l2channel->index, &value))
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return 0;
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return value;
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}
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