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118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Library <2002> Ronald Bultje <rbultje@ronald.bitfreak.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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "video.h"
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/* This is simply a convenience function, nothing more or less */
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gdouble
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gst_video_frame_rate (GstPad *pad)
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{
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gdouble fps = 0.;
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const GstCaps *caps = NULL;
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GstStructure *structure;
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/* get pad caps */
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caps = GST_PAD_CAPS (pad);
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if (caps == NULL) {
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g_warning ("gstvideo: failed to get caps of pad %s:%s",
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GST_ELEMENT_NAME (gst_pad_get_parent (pad)),
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GST_PAD_NAME(pad));
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return 0.;
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}
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_double (structure, "framerate", &fps)){
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g_warning ("gstvideo: failed to get framerate property of pad %s:%s",
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GST_ELEMENT_NAME (gst_pad_get_parent (pad)),
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GST_PAD_NAME (pad));
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return 0.;
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}
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GST_DEBUG ("Framerate request on pad %s:%s: %f",
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GST_ELEMENT_NAME (gst_pad_get_parent (pad)),
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GST_PAD_NAME(pad), fps);
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return fps;
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}
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gboolean
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gst_video_get_size (GstPad *pad,
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gint *width,
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gint *height)
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{
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const GstCaps *caps = NULL;
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GstStructure *structure;
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gboolean ret;
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g_return_val_if_fail (pad != NULL, FALSE);
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g_return_val_if_fail (width != NULL, FALSE);
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g_return_val_if_fail (height != NULL, FALSE);
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caps = GST_PAD_CAPS (pad);
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if (caps == NULL) {
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g_warning ("gstvideo: failed to get caps of pad %s:%s",
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GST_ELEMENT_NAME (gst_pad_get_parent (pad)),
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GST_PAD_NAME(pad));
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return FALSE;
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}
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structure = gst_caps_get_structure (caps, 0);
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ret = gst_structure_get_int (structure, "width", width);
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ret &= gst_structure_get_int (structure, "height", height);
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if (!ret) {
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g_warning ("gstvideo: failed to get size properties on pad %s:%s",
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GST_ELEMENT_NAME (gst_pad_get_parent (pad)),
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GST_PAD_NAME(pad));
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return FALSE;
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}
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GST_DEBUG ("size request on pad %s:%s: %dx%d",
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GST_ELEMENT_NAME (gst_pad_get_parent (pad)),
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GST_PAD_NAME (pad),
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width ? *width : -1,
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height ? *height : -1);
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return TRUE;
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}
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static gboolean
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plugin_init (GstPlugin *plugin)
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{
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return TRUE;
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}
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GST_PLUGIN_DEFINE (
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"gstvideo",
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"Convenience routines for video plugins",
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plugin_init,
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VERSION,
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GST_LICENSE,
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GST_PACKAGE,
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GST_ORIGIN
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)
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