--- /dev/null
+/*
+ * GStreamer - limit video rate
+ *
+ * Copyright 2008 Barracuda Networks, Inc.
+ *
+ * Copyright 2009 Nokia Corporation
+ * Copyright 2009 Collabora Ltd,
+ * @contact: Olivier Crete <olivier.crete@collabora.co.uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "videomaxrate.h"
+
+static GstStaticPadTemplate gst_video_max_rate_src_template =
+ GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb")
+ );
+
+static GstStaticPadTemplate gst_video_max_rate_sink_template =
+ GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb")
+ );
+
+static gboolean gst_video_max_rate_sink_event (GstPad * pad, GstEvent * event);
+static GstCaps *gst_video_max_rate_transform_caps (GstBaseTransform * trans,
+ GstPadDirection direction, GstCaps * caps);
+static gboolean gst_video_max_rate_set_caps (GstBaseTransform * trans,
+ GstCaps * incaps, GstCaps * outcaps);
+static GstFlowReturn gst_video_max_rate_transform_ip (GstBaseTransform * trans,
+ GstBuffer * buf);
+
+GST_BOILERPLATE (GstVideoMaxRate, gst_video_max_rate, GstBaseTransform,
+ GST_TYPE_BASE_TRANSFORM);
+
+static void
+gst_video_max_rate_base_init (gpointer gclass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+ gst_element_class_set_details_simple (element_class,
+ "Video maximum rate adjuster",
+ "Filter/Effect/Video",
+ "Drops extra frames", "Justin Karneges <justin@affinix.com>");
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_video_max_rate_sink_template));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_video_max_rate_src_template));
+}
+
+static void
+gst_video_max_rate_class_init (GstVideoMaxRateClass * klass)
+{
+ GstBaseTransformClass *base_class = GST_BASE_TRANSFORM_CLASS (klass);
+
+ base_class->transform_caps = gst_video_max_rate_transform_caps;
+ base_class->set_caps = gst_video_max_rate_set_caps;
+ base_class->transform_ip = gst_video_max_rate_transform_ip;
+}
+
+static void
+gst_video_max_rate_init (GstVideoMaxRate * videomaxrate,
+ GstVideoMaxRateClass * gclass)
+{
+ videomaxrate->to_rate_numerator = -1;
+ videomaxrate->to_rate_denominator = -1;
+ videomaxrate->have_last_ts = FALSE;
+
+ gst_pad_set_event_function (GST_BASE_TRANSFORM_SINK_PAD (videomaxrate),
+ gst_video_max_rate_sink_event);
+}
+
+gboolean
+gst_video_max_rate_sink_event (GstPad * pad, GstEvent * event)
+{
+ GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (gst_pad_get_parent (pad));
+ gboolean ret;
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_NEWSEGMENT:
+ case GST_EVENT_FLUSH_STOP:
+ videomaxrate->have_last_ts = FALSE;
+ break;
+ default:
+ break;
+ }
+
+ ret = gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (videomaxrate), event);
+
+ gst_object_unref (videomaxrate);
+ return ret;
+}
+
+GstCaps *
+gst_video_max_rate_transform_caps (GstBaseTransform * trans,
+ GstPadDirection direction, GstCaps * caps)
+{
+ GstCaps *ret;
+ GstStructure *structure;
+
+ /* this function is always called with a simple caps */
+ g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
+
+ ret = gst_caps_copy (caps);
+
+ /* set the framerate as a range */
+ structure = gst_structure_copy (gst_caps_get_structure (ret, 0));
+ gst_structure_set (structure, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
+ G_MAXINT, 1, NULL);
+ gst_caps_merge_structure (ret, gst_structure_copy (structure));
+ gst_structure_free (structure);
+
+ return ret;
+}
+
+gboolean
+gst_video_max_rate_set_caps (GstBaseTransform * trans, GstCaps * incaps,
+ GstCaps * outcaps)
+{
+ GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (trans);
+ GstStructure *cs;
+ gint numerator, denominator;
+
+ // keep track of the outbound framerate
+ cs = gst_caps_get_structure (outcaps, 0);
+ if (!gst_structure_get_fraction (cs, "framerate", &numerator, &denominator))
+ return FALSE;
+
+ videomaxrate->to_rate_numerator = numerator;
+ videomaxrate->to_rate_denominator = denominator;
+
+ return TRUE;
+}
+
+GstFlowReturn
+gst_video_max_rate_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
+{
+ GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (trans);
+ GstClockTime ts = GST_BUFFER_TIMESTAMP (buf);
+
+ /* drop frames if they exceed our output rate */
+ if (videomaxrate->have_last_ts) {
+ if (ts < videomaxrate->last_ts + gst_util_uint64_scale (1,
+ videomaxrate->to_rate_denominator * GST_SECOND,
+ videomaxrate->to_rate_numerator)) {
+ return GST_BASE_TRANSFORM_FLOW_DROPPED;
+ }
+ }
+
+ videomaxrate->last_ts = ts;
+ videomaxrate->have_last_ts = TRUE;
+ return GST_FLOW_OK;
+}
+
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+ return gst_element_register (plugin, "videomaxrate", GST_RANK_NONE,
+ GST_TYPE_VIDEO_MAX_RATE);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "videomaxrate",
+ "Drop extra frames",
+ plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
--- /dev/null
+/*
+ * Copyright (C) 2008 Barracuda Networks, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __GST_VIDEOMAXRATE_H__
+#define __GST_VIDEOMAXRATE_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstbasetransform.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_VIDEO_MAX_RATE \
+ (gst_video_max_rate_get_type())
+#define GST_VIDEO_MAX_RATE(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_MAX_RATE,GstVideoMaxRate))
+#define GST_VIDEO_MAX_RATE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_MAX_RATE, \
+ GstVideoMaxRateClass))
+#define GST_IS_VIDEO_MAX_RATE(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_MAX_RATE))
+#define GST_IS_VIDEO_MAX_RATE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_MAX_RATE))
+
+typedef struct _GstVideoMaxRate GstVideoMaxRate;
+typedef struct _GstVideoMaxRateClass GstVideoMaxRateClass;
+
+struct _GstVideoMaxRate
+{
+ GstBaseTransform parent;
+
+ gint to_rate_numerator;
+ gint to_rate_denominator;
+
+ gboolean have_last_ts;
+ GstClockTime last_ts;
+};
+
+struct _GstVideoMaxRateClass
+{
+ GstBaseTransformClass parent_class;
+};
+
+GType gst_video_max_rate_get_type(void);
+
+G_END_DECLS
+
+#endif /* __GST_VIDEOMAXRATE_H__ */
projects / platform / upstream / gstreamer.git / commitdiff