gstreamer/gst-libs/gst/video/video.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Library <2002> Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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.
*/
#include "video.h"
#define NUM_UNITS 1000000000
/* This is simply a convenience function, nothing more or less */
gdouble
gst_video_frame_rate (GstPad *pad)
{
GstFormat dest_format = GST_FORMAT_UNITS;
gint64 dest_value = 0;
gdouble fps;
/* do a convert request on the source pad */
if (!gst_pad_convert(pad,
GST_FORMAT_TIME, GST_SECOND * NUM_UNITS,
&dest_format, &dest_value))
{
g_warning("gstvideo: pad %s:%s failed to convert time to unit!\n",
GST_ELEMENT_NAME(gst_pad_get_parent (pad)), GST_PAD_NAME(pad));
return 0.;
}
fps = ((gdouble) dest_value) / NUM_UNITS;
GST_DEBUG(GST_CAT_ELEMENT_PADS, "Framerate request on pad %s:%s - %f fps",
GST_ELEMENT_NAME(gst_pad_get_parent (pad)), GST_PAD_NAME(pad), fps);
return fps;
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
gst_plugin_set_longname (plugin, "Convenience routines for video plugins");
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstvideo",
plugin_init
};