+++ /dev/null
-/*
- * GStreamer
- * Copyright (C) 2017 Vivia Nikolaidou <vivia@ahiru.eu>
- *
- * 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., 51 Franklin St, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-/**
- * SECTION:element-jitterer
- * @title: jitterer
- *
- * Adds jitter and/or drift to a buffer's PTS and/or DTS. Amplitude and
- * average of jitter and drift are configurable.
- *
- * ## Example launch line
- * |[
- * gst-launch-1.0 videotestsrc ! jitterer drift-average=100 drift-amplitude=10 ! autovideosink
- * ]|
- *
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "gstjitterer.h"
-
-#define GST_CAT_DEFAULT gst_jitterer_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
-
-enum
-{
- PROP_0,
- PROP_JITTER_AMPL,
- PROP_JITTER_AVG,
- PROP_DRIFT_AMPL,
- PROP_DRIFT_AVG,
- PROP_CHANGE_PTS,
- PROP_CHANGE_DTS
-};
-
-static void gst_jitterer_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec);
-static void gst_jitterer_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec);
-static void gst_jitterer_finalize (GObject * object);
-
-static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
- GST_PAD_SINK,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS_ANY);
-
-static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
- GST_PAD_SRC,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS_ANY);
-
-#define parent_class gst_jitterer_parent_class
-G_DEFINE_TYPE (GstJitterer, gst_jitterer, GST_TYPE_ELEMENT);
-
-static GstFlowReturn gst_jitterer_sink_chain (GstPad * pad,
- GstObject * parent, GstBuffer * inbuf);
-static gboolean gst_jitterer_sink_event (GstPad * pad, GstObject * parent,
- GstEvent * event);
-
-static void
-gst_jitterer_class_init (GstJittererClass * klass)
-{
- GstElementClass *gstelement_class;
- GObjectClass *object_class = G_OBJECT_CLASS (klass);
-
- GST_DEBUG_CATEGORY_INIT (gst_jitterer_debug, "jitterer", 0,
- "Add jitter and/or drift to buffers");
-
- gstelement_class = (GstElementClass *) klass;
-
- gst_element_class_set_static_metadata (gstelement_class,
- "Jitterer", "Generic", "Add jitter and/or drift to buffers",
- "Vivia Nikolaidou <vivia@ahiru.eu>");
-
- gst_element_class_add_static_pad_template (gstelement_class, &src_template);
- gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
-
- /* define virtual function pointers */
- object_class->set_property = gst_jitterer_set_property;
- object_class->get_property = gst_jitterer_get_property;
- object_class->finalize = gst_jitterer_finalize;
-
- /* define properties */
- g_object_class_install_property (object_class, PROP_JITTER_AMPL,
- g_param_spec_uint64 ("jitter-amplitude", "Jitter amplitude",
- "Amplitude of the jitter to apply",
- 0, G_MAXINT64 / 2, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
- g_object_class_install_property (object_class, PROP_JITTER_AVG,
- g_param_spec_int64 ("jitter-average", "Jitter average",
- "Average of the jitter to apply",
- -G_MAXINT64 / 2, G_MAXINT64 / 2, 0,
- G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
- g_object_class_install_property (object_class, PROP_DRIFT_AMPL,
- g_param_spec_uint64 ("drift-amplitude", "Drift amplitude",
- "Amplitude of the drift to apply",
- 0, G_MAXINT64 / 2, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
- g_object_class_install_property (object_class, PROP_DRIFT_AVG,
- g_param_spec_int64 ("drift-average", "Drift average",
- "Average of the drift to apply",
- -G_MAXINT64 / 2, G_MAXINT64 / 2, 0,
- G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
- g_object_class_install_property (object_class, PROP_CHANGE_PTS,
- g_param_spec_boolean ("change-pts", "Change PTS",
- "Whether to change the PTS of incoming buffers",
- TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
- g_object_class_install_property (object_class, PROP_CHANGE_DTS,
- g_param_spec_boolean ("change-dts", "Change DTS",
- "Whether to change the DTS of incoming buffers",
- TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
-}
-
-static void
-gst_jitterer_init (GstJitterer * self)
-{
- self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
- gst_pad_set_chain_function (self->sinkpad,
- GST_DEBUG_FUNCPTR (gst_jitterer_sink_chain));
- gst_pad_set_event_function (self->sinkpad,
- GST_DEBUG_FUNCPTR (gst_jitterer_sink_event));
- GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
- GST_PAD_SET_PROXY_CAPS (self->sinkpad);
- GST_PAD_SET_PROXY_SCHEDULING (self->sinkpad);
- gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
-
- self->srcpad = gst_pad_new_from_static_template (&src_template, "src");
- gst_pad_use_fixed_caps (self->srcpad);
- GST_PAD_SET_PROXY_ALLOCATION (self->srcpad);
- GST_PAD_SET_PROXY_CAPS (self->srcpad);
- GST_PAD_SET_PROXY_SCHEDULING (self->srcpad);
- gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
-
- self->jitter_ampl = 0;
- self->jitter_avg = 0;
- self->drift_ampl = 0;
- self->drift_avg = 0;
- self->change_pts = TRUE;
- self->change_dts = TRUE;
- self->prev_pts = GST_CLOCK_TIME_NONE;
-
- self->dts_drift_so_far = 0;
- self->pts_drift_so_far = 0;
- self->rand = g_rand_new ();
-}
-
-static void
-gst_jitterer_finalize (GObject * object)
-{
- GstJitterer *self = GST_JITTERER (object);
-
- g_rand_free (self->rand);
-
- G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-static void
-gst_jitterer_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstJitterer *self = GST_JITTERER (object);
-
- switch (prop_id) {
- case PROP_JITTER_AMPL:
- self->jitter_ampl = g_value_get_uint64 (value);
- break;
- case PROP_JITTER_AVG:
- self->jitter_avg = g_value_get_int64 (value);
- break;
- case PROP_DRIFT_AMPL:
- self->drift_ampl = g_value_get_uint64 (value);
- break;
- case PROP_DRIFT_AVG:
- self->drift_avg = g_value_get_int64 (value);
- break;
- case PROP_CHANGE_PTS:
- self->change_pts = g_value_get_boolean (value);
- break;
- case PROP_CHANGE_DTS:
- self->change_dts = g_value_get_boolean (value);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static void
-gst_jitterer_get_property (GObject * object, guint prop_id, GValue * value,
- GParamSpec * pspec)
-{
- GstJitterer *self = GST_JITTERER (object);
-
- switch (prop_id) {
- case PROP_JITTER_AMPL:
- g_value_set_uint64 (value, self->jitter_ampl);
- break;
- case PROP_JITTER_AVG:
- g_value_set_int64 (value, self->jitter_avg);
- break;
- case PROP_DRIFT_AMPL:
- g_value_set_uint64 (value, self->drift_ampl);
- break;
- case PROP_DRIFT_AVG:
- g_value_set_int64 (value, self->drift_avg);
- break;
- case PROP_CHANGE_PTS:
- g_value_set_boolean (value, self->change_pts);
- break;
- case PROP_CHANGE_DTS:
- g_value_set_boolean (value, self->change_dts);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static gint64
-gst_jitterer_rand_uint64_range (GRand * rand, gint64 min, gint64 max)
-{
- gint64 dist;
-
- g_assert (max > min);
- dist = max - min;
-
- if (G_LIKELY (dist < G_MAXINT32)) {
- return g_rand_int_range (rand, 0, dist) + min;
- } else {
- /* This code is based on g_rand_int_range source */
- gint64 ret = max + 1;
- /* maxvalue is set to the predecessor of the greatest
- * multiple of dist less or equal 2^64.
- */
- guint64 maxvalue;
- if (dist <= 0x8000000000000000u) { /* 2^63 */
- /* maxvalue = 2^64 - 1 - (2^64 % dist) */
- guint64 leftover = (0x8000000000000000u % dist) * 2;
- if (leftover >= dist)
- leftover -= dist;
- maxvalue = 0xffffffffffffffffu - leftover;
- } else {
- maxvalue = dist - 1;
- }
- do {
- gint32 highrand, lowrand;
-
- highrand = g_rand_int (rand);
- lowrand = g_rand_int (rand);
- ret = ((((gint64) highrand) << 32) | lowrand);
- } while (ret > maxvalue);
- ret %= dist;
- return ret;
- }
-}
-
-static gboolean
-gst_jitterer_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
-{
- GstJitterer *self = GST_JITTERER (parent);
-
- switch (GST_EVENT_TYPE (event)) {
- case GST_EVENT_SEGMENT:
- case GST_EVENT_FLUSH_STOP:
- self->prev_pts = GST_CLOCK_TIME_NONE;
- break;
- default:
- break;
- }
- return gst_pad_event_default (pad, parent, event);
-}
-
-static GstFlowReturn
-gst_jitterer_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * inbuf)
-{
- GstJitterer *self = GST_JITTERER (parent);
-
- if (self->jitter_ampl > 0) {
- gint64 min, max;
- gint64 jitter;
-
- min = self->jitter_avg - self->jitter_ampl / 2;
- max = self->jitter_avg + self->jitter_ampl / 2;
-
- if (self->change_pts && GST_BUFFER_PTS (inbuf) != GST_CLOCK_TIME_NONE) {
- jitter = gst_jitterer_rand_uint64_range (self->rand, min, max);
- if (GST_BUFFER_PTS (inbuf) + jitter > 0)
- GST_BUFFER_PTS (inbuf) = GST_BUFFER_PTS (inbuf) + jitter;
- }
- if (self->change_dts && GST_BUFFER_DTS (inbuf) != GST_CLOCK_TIME_NONE) {
- jitter = gst_jitterer_rand_uint64_range (self->rand, min, max);
- if (GST_BUFFER_DTS (inbuf) + jitter > 0)
- GST_BUFFER_DTS (inbuf) = GST_BUFFER_DTS (inbuf) + jitter;
- }
- } else {
- if (self->change_pts && GST_BUFFER_PTS (inbuf) != GST_CLOCK_TIME_NONE)
- GST_BUFFER_PTS (inbuf) = GST_BUFFER_PTS (inbuf) + self->jitter_avg;
- if (self->change_dts && GST_BUFFER_DTS (inbuf) != GST_CLOCK_TIME_NONE)
- GST_BUFFER_DTS (inbuf) = GST_BUFFER_DTS (inbuf) + self->jitter_avg;
- }
-
- if (self->prev_pts != GST_CLOCK_TIME_NONE) {
- GstClockTimeDiff drift_avg_per_frame;
- GstClockTime pts_diff = GST_BUFFER_PTS (inbuf) - self->prev_pts;
-
- if (self->drift_avg == 0) {
- drift_avg_per_frame = 0;
- } else if (self->drift_avg > 0) {
- drift_avg_per_frame =
- gst_util_uint64_scale (self->drift_avg, pts_diff, GST_SECOND);
- } else {
- drift_avg_per_frame =
- -gst_util_uint64_scale (-self->drift_avg, pts_diff, GST_SECOND);
- }
-
- if (self->drift_ampl > 0) {
- gint min, max;
- GstClockTime drift_ampl_per_frame;
-
- drift_ampl_per_frame =
- gst_util_uint64_scale (self->drift_ampl, pts_diff, GST_SECOND);
-
- min = drift_avg_per_frame - drift_ampl_per_frame / 2;
- max = drift_avg_per_frame + drift_ampl_per_frame / 2;
-
- if (self->change_pts && GST_BUFFER_PTS (inbuf) != GST_CLOCK_TIME_NONE) {
- /* FIXME: if (min == max) means the amplitude is too small, make a
- * probabilistic +1 or -1 instead */
- if (min == max)
- self->pts_drift_so_far += drift_avg_per_frame;
- else
- self->pts_drift_so_far +=
- gst_jitterer_rand_uint64_range (self->rand, min, max);
- if (GST_BUFFER_PTS (inbuf) + self->pts_drift_so_far > 0)
- GST_BUFFER_PTS (inbuf) =
- GST_BUFFER_PTS (inbuf) + self->pts_drift_so_far;
- }
- if (self->change_dts && GST_BUFFER_DTS (inbuf) != GST_CLOCK_TIME_NONE) {
- if (min == max)
- self->pts_drift_so_far += drift_avg_per_frame;
- else
- self->dts_drift_so_far +=
- gst_jitterer_rand_uint64_range (self->rand, min, max);
- if (GST_BUFFER_DTS (inbuf) + self->dts_drift_so_far > 0)
- GST_BUFFER_DTS (inbuf) =
- GST_BUFFER_DTS (inbuf) + self->dts_drift_so_far;
- }
- } else {
- if (self->change_pts && GST_BUFFER_PTS (inbuf) != GST_CLOCK_TIME_NONE) {
- self->pts_drift_so_far += drift_avg_per_frame;
- GST_BUFFER_PTS (inbuf) =
- GST_BUFFER_PTS (inbuf) + self->pts_drift_so_far;
- }
- if (self->change_dts && GST_BUFFER_DTS (inbuf) != GST_CLOCK_TIME_NONE) {
- self->dts_drift_so_far += drift_avg_per_frame;
- GST_BUFFER_DTS (inbuf) =
- GST_BUFFER_DTS (inbuf) + self->dts_drift_so_far;
- }
- }
- }
- self->prev_pts = GST_BUFFER_PTS (inbuf);
-
- return gst_pad_push (self->srcpad, inbuf);
-}
projects / platform / upstream / gstreamer.git / commitdiff