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dc0f45d20c
Original commit message from CVS: * docs/libs/gst-plugins-base-libs-docs.sgml: * docs/libs/gst-plugins-base-libs-sections.txt: * docs/libs/tmpl/gstaudio.sgml: * docs/libs/tmpl/gstringbuffer.sgml: * gst-libs/gst/interfaces/xoverlay.c: * gst-libs/gst/video/gstvideofilter.c: * gst-libs/gst/video/gstvideosink.c: update documentation
138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/*
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* GStreamer Video sink.
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*
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* Copyright (C) <2003> Julien Moutte <julien@moutte.net>
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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:gstvideosink
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* @short_description: Base class for video sinks
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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 sinks. Right now it's
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* mostly used as a place holder for adding common code later on.
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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 "gstvideosink.h"
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static GstElementClass *parent_class = NULL;
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/**
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* gst_video_sink_center_rect:
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* @src: the #GstVideoRectangle describing the source area
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* @dst: the #GstVideoRectangle describing the destination area
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* @result: a pointer to a #GstVideoRectangle which will receive the result area
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* @scaling: a #gboolean indicating if scaling should be applied or not
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*
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* Takes @src rectangle and position it at the center of @dst rectangle with or
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* without @scaling. It handles clipping if the @src rectangle is bigger than
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* the @dst one and @scaling is set to FALSE.
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*/
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void
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gst_video_sink_center_rect (GstVideoRectangle src, GstVideoRectangle dst,
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GstVideoRectangle * result, gboolean scaling)
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{
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g_return_if_fail (result != NULL);
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if (!scaling) {
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result->w = MIN (src.w, dst.w);
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result->h = MIN (src.h, dst.h);
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result->x = (dst.w - result->w) / 2;
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result->y = (dst.h - result->h) / 2;
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} else {
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gdouble src_ratio, dst_ratio;
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src_ratio = (gdouble) src.w / src.h;
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dst_ratio = (gdouble) dst.w / dst.h;
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if (src_ratio > dst_ratio) {
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result->w = dst.w;
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result->h = dst.w / src_ratio;
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result->x = 0;
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result->y = (dst.h - result->h) / 2;
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} else if (src_ratio < dst_ratio) {
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result->w = dst.h * src_ratio;
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result->h = dst.h;
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result->x = (dst.w - result->w) / 2;
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result->y = 0;
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} else {
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result->x = 0;
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result->y = 0;
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result->w = dst.w;
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result->h = dst.h;
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}
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}
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GST_DEBUG ("source is %dx%d dest is %dx%d, result is %dx%d with x,y %dx%d",
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src.w, src.h, dst.w, dst.h, result->w, result->h, result->x, result->y);
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}
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/* Initing stuff */
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static void
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gst_video_sink_init (GstVideoSink * videosink)
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{
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videosink->width = 0;
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videosink->height = 0;
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}
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static void
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gst_video_sink_class_init (GstVideoSinkClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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}
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/* Public methods */
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GType
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gst_video_sink_get_type (void)
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{
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static GType videosink_type = 0;
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if (!videosink_type) {
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static const GTypeInfo videosink_info = {
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sizeof (GstVideoSinkClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_video_sink_class_init,
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NULL,
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NULL,
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sizeof (GstVideoSink),
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0,
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(GInstanceInitFunc) gst_video_sink_init,
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};
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videosink_type = g_type_register_static (GST_TYPE_BASE_SINK,
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"GstVideoSink", &videosink_info, 0);
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}
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return videosink_type;
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}
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