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79809633de
Usually this information is static for the whole stream, and various container formats store this information inside the headers for the whole stream. Having it inside the caps for these cases simplifies code and makes it possible to express these requirements more explicitly with the caps. https://bugzilla.gnome.org/show_bug.cgi?id=771376
227 lines
6.4 KiB
C
227 lines
6.4 KiB
C
/* GStreamer
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* Copyright (C) 2006 Nokia <stefan.kost@nokia.com>
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*
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* videoorientation.c: video flipping and centering interface
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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 "videoorientation.h"
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#include <string.h>
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/**
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* SECTION:gstvideoorientation
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* @short_description: Interface for elements providing video orientation
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* controls
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*
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* The interface allows unified access to control flipping and autocenter
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* operation of video-sources or operators.
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*/
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/* FIXME 0.11: check if we need to add API for sometimes-supportedness
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* (aka making up for GstImplementsInterface removal) (probably yes) */
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G_DEFINE_INTERFACE (GstVideoOrientation, gst_video_orientation, 0)
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static void
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gst_video_orientation_default_init (GstVideoOrientationInterface *
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iface)
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{
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/* default virtual functions */
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iface->get_hflip = NULL;
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iface->get_vflip = NULL;
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iface->get_hcenter = NULL;
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iface->get_vcenter = NULL;
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iface->set_hflip = NULL;
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iface->set_vflip = NULL;
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iface->set_hcenter = NULL;
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iface->set_vcenter = NULL;
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}
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/**
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* gst_video_orientation_get_hflip:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @flip: return location for the result
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*
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* Get the horizontal flipping state (%TRUE for flipped) from the given object.
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* Returns: %TRUE in case the element supports flipping
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*/
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gboolean
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gst_video_orientation_get_hflip (GstVideoOrientation * video_orientation,
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gboolean * flip)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->get_hflip) {
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return iface->get_hflip (video_orientation, flip);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_get_vflip:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @flip: return location for the result
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*
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* Get the vertical flipping state (%TRUE for flipped) from the given object.
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* Returns: %TRUE in case the element supports flipping
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*/
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gboolean
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gst_video_orientation_get_vflip (GstVideoOrientation * video_orientation,
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gboolean * flip)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->get_vflip) {
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return iface->get_vflip (video_orientation, flip);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_get_hcenter:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @center: return location for the result
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*
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* Get the horizontal centering offset from the given object.
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* Returns: %TRUE in case the element supports centering
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*/
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gboolean
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gst_video_orientation_get_hcenter (GstVideoOrientation * video_orientation,
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gint * center)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->get_hcenter) {
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return iface->get_hcenter (video_orientation, center);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_get_vcenter:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @center: return location for the result
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*
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* Get the vertical centering offset from the given object.
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* Returns: %TRUE in case the element supports centering
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*/
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gboolean
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gst_video_orientation_get_vcenter (GstVideoOrientation * video_orientation,
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gint * center)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->get_vcenter) {
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return iface->get_vcenter (video_orientation, center);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_set_hflip:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @flip: use flipping
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*
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* Set the horizontal flipping state (%TRUE for flipped) for the given object.
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* Returns: %TRUE in case the element supports flipping
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*/
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gboolean
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gst_video_orientation_set_hflip (GstVideoOrientation * video_orientation,
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gboolean flip)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->set_hflip) {
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return iface->set_hflip (video_orientation, flip);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_set_vflip:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @flip: use flipping
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*
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* Set the vertical flipping state (%TRUE for flipped) for the given object.
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* Returns: %TRUE in case the element supports flipping
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*/
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gboolean
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gst_video_orientation_set_vflip (GstVideoOrientation * video_orientation,
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gboolean flip)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->set_vflip) {
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return iface->set_vflip (video_orientation, flip);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_set_hcenter:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @center: centering offset
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*
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* Set the horizontal centering offset for the given object.
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* Returns: %TRUE in case the element supports centering
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*/
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gboolean
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gst_video_orientation_set_hcenter (GstVideoOrientation * video_orientation,
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gint center)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->set_hcenter) {
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return iface->set_hcenter (video_orientation, center);
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}
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return FALSE;
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}
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/**
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* gst_video_orientation_set_vcenter:
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* @video_orientation: #GstVideoOrientation interface of a #GstElement
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* @center: centering offset
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*
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* Set the vertical centering offset for the given object.
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* Returns: %TRUE in case the element supports centering
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*/
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gboolean
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gst_video_orientation_set_vcenter (GstVideoOrientation * video_orientation,
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gint center)
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{
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GstVideoOrientationInterface *iface =
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GST_VIDEO_ORIENTATION_GET_INTERFACE (video_orientation);
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if (iface->set_vcenter) {
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return iface->set_vcenter (video_orientation, center);
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}
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return FALSE;
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}
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