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-rw-r--r--gst/videodrop/gstvideodrop.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/gst/videodrop/gstvideodrop.c b/gst/videodrop/gstvideodrop.c
new file mode 100644
index 00000000..252d773b
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+++ b/gst/videodrop/gstvideodrop.c
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+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gstvideodrop.h>
+
+/* elementfactory information */
+static GstElementDetails videodrop_details = {
+ "Video frame dropper",
+ "Filter/Video",
+ "LGPL",
+ "Re-FPS'es video",
+ VERSION,
+ "Ronald Bultje <rbultje@ronald.bitfreak.net>",
+ "(C) 2003",
+};
+
+/* GstVideodrop signals and args */
+enum {
+ /* FILL ME */
+ LAST_SIGNAL
+};
+
+enum {
+ ARG_0,
+ /* FILL ME */
+};
+
+GST_PAD_TEMPLATE_FACTORY(src_template,
+ "src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_CAPS_NEW(
+ "framedropper_yuv",
+ "video/x-raw-yuv",
+ "framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT),
+ "width", GST_PROPS_INT_RANGE (0, G_MAXINT),
+ "height", GST_PROPS_INT_RANGE (0, G_MAXINT),
+ "format", GST_PROPS_LIST (
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','U','Y','2')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','V','1','2')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','U','Y','V')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('U','Y','V','Y'))
+ )
+ )
+)
+
+GST_PAD_TEMPLATE_FACTORY(sink_template,
+ "sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_CAPS_NEW(
+ "framedropper_yuv",
+ "video/x-raw-yuv",
+ "framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT),
+ "width", GST_PROPS_INT_RANGE (0, G_MAXINT),
+ "height", GST_PROPS_INT_RANGE (0, G_MAXINT),
+ "format", GST_PROPS_LIST (
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','U','Y','2')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','V','1','2')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('Y','U','Y','V')),
+ GST_PROPS_FOURCC (GST_MAKE_FOURCC ('U','Y','V','Y'))
+ )
+ )
+)
+
+static void gst_videodrop_class_init (GstVideodropClass *klass);
+static void gst_videodrop_init (GstVideodrop *videodrop);
+static void gst_videodrop_chain (GstPad *pad, GstBuffer *buf);
+
+static GstElementClass *parent_class = NULL;
+/*static guint gst_videodrop_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_videodrop_get_type (void)
+{
+ static GType videodrop_type = 0;
+
+ if (!videodrop_type) {
+ static const GTypeInfo videodrop_info = {
+ sizeof (GstVideodropClass),
+ NULL,
+ NULL,
+ (GClassInitFunc) gst_videodrop_class_init,
+ NULL,
+ NULL,
+ sizeof (GstVideodrop),
+ 0,
+ (GInstanceInitFunc) gst_videodrop_init,
+ };
+
+ videodrop_type = g_type_register_static (GST_TYPE_ELEMENT,
+ "GstVideodrop",
+ &videodrop_info, 0);
+ }
+
+ return videodrop_type;
+}
+
+static void
+gst_videodrop_class_init (GstVideodropClass *klass)
+{
+ parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+}
+
+#define gst_caps_get_float_range(caps, name, min, max) \
+ gst_props_entry_get_float_range(gst_props_get_entry((caps)->properties, \
+ name), \
+ min, max)
+
+static GstPadLinkReturn
+gst_videodrop_link (GstPad *pad, GstCaps *caps)
+{
+ GstVideodrop *videodrop;
+ GstPadLinkReturn ret;
+ GstCaps *peercaps;
+
+ videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
+
+ videodrop->inited = FALSE;
+
+ if (!GST_CAPS_IS_FIXED (caps)) {
+ return GST_PAD_LINK_DELAYED;
+ }
+
+ gst_caps_get_float (caps, "framerate", &videodrop->from_fps);
+
+ /* calc output fps */
+ peercaps = gst_pad_get_allowed_caps (videodrop->srcpad);
+ if (gst_caps_has_fixed_property (peercaps, "framerate")) {
+ gst_caps_get_float (peercaps, "framerate", &videodrop->to_fps);
+ } else {
+ gfloat min, max;
+ gst_caps_get_float_range (peercaps, "framerate", &min, &max);
+ if (videodrop->from_fps >= min &&
+ videodrop->from_fps <= max) {
+ videodrop->to_fps = videodrop->from_fps;
+ } else {
+ videodrop->to_fps = max;
+ }
+ }
+ gst_caps_unref (peercaps);
+
+ GST_DEBUG ("%f -> %f fps",
+ videodrop->from_fps, videodrop->to_fps);
+
+ peercaps = gst_caps_copy (caps);
+
+ peercaps->properties = gst_caps_set (peercaps, "framerate",
+ GST_PROPS_FLOAT (videodrop->to_fps));
+
+ if ((ret = gst_pad_try_set_caps (videodrop->srcpad, peercaps)) > 0) {
+ videodrop->inited = TRUE;
+ videodrop->total = videodrop->pass = 0;
+ }
+
+ return ret;
+}
+
+static void
+gst_videodrop_init (GstVideodrop *videodrop)
+{
+ GST_DEBUG ("gst_videodrop_init");
+ videodrop->sinkpad = gst_pad_new_from_template (
+ GST_PAD_TEMPLATE_GET (sink_template),
+ "sink");
+ gst_element_add_pad (GST_ELEMENT (videodrop), videodrop->sinkpad);
+ gst_pad_set_chain_function (videodrop->sinkpad, gst_videodrop_chain);
+ gst_pad_set_link_function (videodrop->sinkpad, gst_videodrop_link);
+
+ videodrop->srcpad = gst_pad_new_from_template (
+ GST_PAD_TEMPLATE_GET (src_template),
+ "src");
+ gst_element_add_pad (GST_ELEMENT(videodrop), videodrop->srcpad);
+
+ videodrop->inited = FALSE;
+ videodrop->total = videodrop->pass = 0;
+}
+
+static void
+gst_videodrop_chain (GstPad *pad, GstBuffer *buf)
+{
+ GstVideodrop *videodrop;
+
+ GST_DEBUG ("gst_videodrop_chain");
+
+ g_return_if_fail (pad != NULL);
+ g_return_if_fail (GST_IS_PAD (pad));
+ g_return_if_fail (buf != NULL);
+
+ videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
+
+ if (GST_IS_EVENT (buf)) {
+ gst_pad_push (videodrop->srcpad, buf);
+ return;
+ }
+
+ videodrop->total++;
+ while (videodrop->to_fps / videodrop->from_fps >
+ (gfloat) videodrop->pass / videodrop->total) {
+ videodrop->pass++;
+ gst_buffer_ref (buf);
+ gst_pad_push (videodrop->srcpad, buf);
+ }
+
+ gst_buffer_unref (buf);
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+ GstElementFactory *factory;
+
+ /* create an elementfactory for the videodrop element */
+ factory = gst_element_factory_new ("videodrop", GST_TYPE_VIDEODROP,
+ &videodrop_details);
+ g_return_val_if_fail (factory != NULL, FALSE);
+
+ gst_element_factory_add_pad_template (factory,
+ GST_PAD_TEMPLATE_GET (sink_template));
+ gst_element_factory_add_pad_template (factory,
+ GST_PAD_TEMPLATE_GET (src_template));
+
+ gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+ return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+ GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "videodrop",
+ plugin_init
+};
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-29 11:11:48 +0000