/* * GStreamer - limit video rate * * Copyright 2008 Barracuda Networks, Inc. * * Copyright 2009 Nokia Corporation * Copyright 2009 Collabora Ltd, * @contact: Olivier Crete * * 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 * */ /** * SECTION:element-videomaxrate * @see_also: videorate * * This object will drop buffers that go beyond a certain buffer rate * (ie frame rate). It should work with any kind of data where each buffer * is independent. This currently means raw video frames and still image * formats. * * The framerate is computed using a moving average. The period over which this * average is computed is configurable using the "average-period" property. */ #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; video/x-raw-gray;" "image/jpeg; image/png") ); 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; video/x-raw-gray;" "image/jpeg; image/png") ); static void gst_video_max_rate_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_video_max_rate_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_video_max_rate_start (GstBaseTransform * trans); static gboolean gst_video_max_rate_sink_event (GstBaseTransform * trans, 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); static void gst_video_max_rate_fixate_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps); GST_BOILERPLATE (GstVideoMaxRate, gst_video_max_rate, GstBaseTransform, GST_TYPE_BASE_TRANSFORM); #define DEFAULT_AVERAGE_PERIOD GST_SECOND enum { PROP_0, PROP_AVERAGE_PERIOD }; 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 "); gst_element_class_add_static_pad_template (element_class, &gst_video_max_rate_sink_template); gst_element_class_add_static_pad_template (element_class, &gst_video_max_rate_src_template); } static void gst_video_max_rate_class_init (GstVideoMaxRateClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstBaseTransformClass *base_class = GST_BASE_TRANSFORM_CLASS (klass); gobject_class->set_property = gst_video_max_rate_set_property; gobject_class->get_property = gst_video_max_rate_get_property; base_class->transform_caps = GST_DEBUG_FUNCPTR (gst_video_max_rate_transform_caps); base_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_max_rate_set_caps); base_class->transform_ip = GST_DEBUG_FUNCPTR (gst_video_max_rate_transform_ip); base_class->event = GST_DEBUG_FUNCPTR (gst_video_max_rate_sink_event); base_class->start = GST_DEBUG_FUNCPTR (gst_video_max_rate_start); base_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_max_rate_fixate_caps); g_object_class_install_property (gobject_class, PROP_AVERAGE_PERIOD, g_param_spec_uint64 ("average-period", "Period over which to average", "Period over which to average the framerate (in ns)", 1, G_MAXINT64, DEFAULT_AVERAGE_PERIOD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_video_max_rate_reset (GstVideoMaxRate * videomaxrate) { videomaxrate->last_ts = GST_CLOCK_TIME_NONE; videomaxrate->average = 0; } static void gst_video_max_rate_init (GstVideoMaxRate * videomaxrate, GstVideoMaxRateClass * gclass) { gst_video_max_rate_reset (videomaxrate); videomaxrate->wanted_diff = 0; videomaxrate->average_period = DEFAULT_AVERAGE_PERIOD; gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (videomaxrate), TRUE); gst_base_transform_set_in_place (GST_BASE_TRANSFORM (videomaxrate), TRUE); } static void gst_video_max_rate_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (object); switch (prop_id) { case PROP_AVERAGE_PERIOD: videomaxrate->average_period = g_value_get_uint64 (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_video_max_rate_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (object); switch (prop_id) { case PROP_AVERAGE_PERIOD: g_value_set_uint64 (value, videomaxrate->average_period); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_video_max_rate_start (GstBaseTransform * trans) { GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (trans); gst_video_max_rate_reset (videomaxrate); return TRUE; } gboolean gst_video_max_rate_sink_event (GstBaseTransform * trans, GstEvent * event) { GstVideoMaxRate *videomaxrate = GST_VIDEO_MAX_RATE (trans); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT: case GST_EVENT_FLUSH_STOP: gst_video_max_rate_reset (videomaxrate); break; default: break; } return TRUE; } GstCaps * gst_video_max_rate_transform_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps) { GstCaps *ret; GstStructure *s; /* 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); s = gst_structure_copy (gst_caps_get_structure (caps, 0)); /* set the framerate as a range */ gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL); gst_caps_merge_structure (ret, s); return ret; } static void gst_video_max_rate_fixate_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps) { GstStructure *s; gint nom, denom; s = gst_caps_get_structure (caps, 0); if (G_UNLIKELY (!gst_structure_get_fraction (s, "framerate", &nom, &denom))) return; s = gst_caps_get_structure (othercaps, 0); gst_structure_fixate_field_nearest_fraction (s, "framerate", nom, denom); } 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; if (numerator) videomaxrate->wanted_diff = gst_util_uint64_scale_int (GST_SECOND, denominator, numerator); else videomaxrate->wanted_diff = 0; gst_video_max_rate_reset (videomaxrate); 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); if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf) || videomaxrate->wanted_diff == 0) return GST_FLOW_OK; /* drop frames if they exceed our output rate */ if (GST_CLOCK_TIME_IS_VALID (videomaxrate->last_ts)) { GstClockTimeDiff diff = ts - videomaxrate->last_ts; /* Drop buffer if its early compared to the desired frame rate and * the current average is higher than the desired average */ if (diff < videomaxrate->wanted_diff && videomaxrate->average < videomaxrate->wanted_diff) return GST_BASE_TRANSFORM_FLOW_DROPPED; /* Update average */ if (videomaxrate->average) { GstClockTimeDiff wanted_diff; if (G_LIKELY (videomaxrate->average_period > videomaxrate->wanted_diff)) wanted_diff = videomaxrate->wanted_diff; else wanted_diff = videomaxrate->average_period * 10; videomaxrate->average = gst_util_uint64_scale_round (videomaxrate->average, videomaxrate->average_period - wanted_diff, videomaxrate->average_period) + gst_util_uint64_scale_round (diff, wanted_diff, videomaxrate->average_period); } else { videomaxrate->average = diff; } } videomaxrate->last_ts = ts; 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)