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125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2003> David Schleef <ds@schleef.org>
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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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/**
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* SECTION:gstvideofilter
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* @short_description: Base class for video filters
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*
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* <refsect2>
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* <para>
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* Provides useful functions and a base class for video filters.
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* </para>
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* <para>
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* The videofilter will by default enable QoS on the parent GstBaseTransform
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* to implement frame dropping.
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* </para>
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* </refsect2>
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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 "gstvideofilter.h"
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#include <gst/video/video.h>
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GST_DEBUG_CATEGORY_STATIC (gst_video_filter_debug);
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#define GST_CAT_DEFAULT gst_video_filter_debug
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static void gst_video_filter_class_init (gpointer g_class, gpointer class_data);
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static void gst_video_filter_init (GTypeInstance * instance, gpointer g_class);
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static GstBaseTransformClass *parent_class = NULL;
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GType
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gst_video_filter_get_type (void)
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{
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static GType video_filter_type = 0;
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if (!video_filter_type) {
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static const GTypeInfo video_filter_info = {
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sizeof (GstVideoFilterClass),
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NULL,
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NULL,
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gst_video_filter_class_init,
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NULL,
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NULL,
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sizeof (GstVideoFilter),
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0,
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gst_video_filter_init,
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};
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video_filter_type = g_type_register_static (GST_TYPE_BASE_TRANSFORM,
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"GstVideoFilter", &video_filter_info, G_TYPE_FLAG_ABSTRACT);
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}
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return video_filter_type;
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}
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static gboolean
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gst_video_filter_get_unit_size (GstBaseTransform * btrans, GstCaps * caps,
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guint * size)
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{
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GstVideoFormat fmt;
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gint width, height;
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if (!gst_video_format_parse_caps (caps, &fmt, &width, &height)) {
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GST_WARNING_OBJECT (btrans, "Failed to parse caps %" GST_PTR_FORMAT, caps);
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return FALSE;
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}
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*size = gst_video_format_get_size (fmt, width, height);
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GST_DEBUG_OBJECT (btrans, "Returning size %u bytes for caps %"
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GST_PTR_FORMAT, *size, caps);
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return TRUE;
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}
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static void
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gst_video_filter_class_init (gpointer g_class, gpointer class_data)
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{
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GstBaseTransformClass *trans_class;
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GstVideoFilterClass *klass;
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klass = (GstVideoFilterClass *) g_class;
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trans_class = (GstBaseTransformClass *) klass;
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trans_class->get_unit_size =
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GST_DEBUG_FUNCPTR (gst_video_filter_get_unit_size);
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parent_class = g_type_class_peek_parent (klass);
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GST_DEBUG_CATEGORY_INIT (gst_video_filter_debug, "videofilter", 0,
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"videofilter");
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}
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static void
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gst_video_filter_init (GTypeInstance * instance, gpointer g_class)
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{
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GstVideoFilter *videofilter = GST_VIDEO_FILTER (instance);
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GST_DEBUG_OBJECT (videofilter, "gst_video_filter_init");
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videofilter->inited = FALSE;
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/* enable QoS */
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gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (videofilter), TRUE);
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}
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