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97 lines
2.8 KiB
C
97 lines
2.8 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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#include "video.h"
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#define NUM_UNITS 1000000000
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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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GstFormat dest_format = GST_FORMAT_UNITS;
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gint64 dest_value = 0;
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gdouble fps;
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/* do a convert request on the source pad */
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if (!gst_pad_convert(pad,
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GST_FORMAT_TIME, GST_SECOND * NUM_UNITS,
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&dest_format, &dest_value))
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{
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g_warning("gstvideo: pad %s:%s failed to convert time to unit!\n",
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GST_ELEMENT_NAME(gst_pad_get_parent (pad)), GST_PAD_NAME(pad));
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return 0.;
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}
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fps = ((gdouble) dest_value) / NUM_UNITS;
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GST_DEBUG(GST_CAT_ELEMENT_PADS, "Framerate request on pad %s:%s - %f fps",
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GST_ELEMENT_NAME(gst_pad_get_parent (pad)), 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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GstCaps *caps;
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g_return_val_if_fail(pad != NULL, FALSE);
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caps = GST_PAD_CAPS(pad);
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if (!caps) {
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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)), GST_PAD_NAME(pad));
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return FALSE;
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}
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if (!gst_caps_has_property(caps, "width") ||
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!gst_caps_has_property(caps, "height")) {
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g_warning("gstvideo: resulting caps doesn't have width/height properties");
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return FALSE;
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}
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if (width)
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gst_caps_get_int(caps, "width", width);
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if (height)
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gst_caps_get_int(caps, "height", height);
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GST_DEBUG(GST_CAT_ELEMENT_PADS, "size request on pad %s:%s: %dx%d",
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GST_ELEMENT_NAME(gst_pad_get_parent (pad)), GST_PAD_NAME(pad),
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width?*width:0, height?*height:0);
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return TRUE;
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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gst_plugin_set_longname (plugin, "Convenience routines for video plugins");
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"gstvideo",
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plugin_init
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};
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