/* 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 void gst_v4l2_color_balance_channel_class_init(GstV4l2ColorBalanceChannelClass *klass); static void gst_v4l2_color_balance_channel_init (GstV4l2ColorBalanceChannel *channel); 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); static GstColorBalanceChannelClass *parent_class = NULL; GType gst_v4l2_color_balance_channel_get_type (void) { static GType gst_v4l2_color_balance_channel_type = 0; if (!gst_v4l2_color_balance_channel_type) { static const GTypeInfo v4l2_tuner_channel_info = { sizeof (GstV4l2ColorBalanceChannelClass), NULL, NULL, (GClassInitFunc) gst_v4l2_color_balance_channel_class_init, NULL, NULL, sizeof (GstV4l2ColorBalanceChannel), 0, (GInstanceInitFunc) gst_v4l2_color_balance_channel_init, NULL }; gst_v4l2_color_balance_channel_type = g_type_register_static (GST_TYPE_COLOR_BALANCE_CHANNEL, "GstV4l2ColorBalanceChannel", &v4l2_tuner_channel_info, 0); } return gst_v4l2_color_balance_channel_type; } static void gst_v4l2_color_balance_channel_class_init (GstV4l2ColorBalanceChannelClass *klass) { parent_class = g_type_class_ref (GST_TYPE_COLOR_BALANCE_CHANNEL); } static void gst_v4l2_color_balance_channel_init (GstV4l2ColorBalanceChannel *channel) { channel->index = 0; } void gst_v4l2_color_balance_interface_init (GstColorBalanceClass *klass) { /* 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 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->index, 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->index, &value)) return 0; return value; }