gstreamer/libs/gst/controller/gsttriggercontrolsource.c
Tim-Philipp Müller 57c8e0146f libs: figure out right export define in configure
Add new GST_API_EXPORT in config.h and use that for GST_*_API
decorators instead of GST_EXPORT.

The right export define depends on the toolchain and whether
we're using -fvisibility=hidden or not, so it's better to set it
to the right thing directly than hard-coding a compiler whitelist
in the public header.

We put the export define into config.h instead of passing it via the
command line to the compiler because it might contain spaces and brackets
and in the autotools scenario we'd have to pass that through multiple
layers of plumbing and Makefile/shell escaping and we're just not going
to be *that* lucky.

The export define is only used if we're compiling our lib, not by external
users of the lib headers, so it's not a problem to put it into config.h

Also, this means all .c files of libs need to include config.h
to get the export marker defined, so fix up a few that didn't
include config.h.

This commit depends on a common submodule commit that makes gst-glib-gen.mak
add an #include "config.h" to generated enum/marshal .c files for the
autotools build.

https://bugzilla.gnome.org/show_bug.cgi?id=797185
2018-09-24 08:39:37 +01:00

263 lines
7.3 KiB
C

/* GStreamer
*
* Copyright (C) 2007,2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* 2011 Stefan Sauer <ensonic@users.sf.net>
*
* gsttriggercontrolsource.c: Control source that provides some values at time-
* stamps
*
* 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:gsttriggercontrolsource
* @title: GstTriggerControlSource
* @short_description: trigger control source
*
* #GstTriggerControlSource is a #GstControlSource, that returns values from user-given
* control points. It allows for a tolerance on the time-stamps.
*
* To use #GstTriggerControlSource get a new instance by calling
* gst_trigger_control_source_new(), bind it to a #GParamSpec and set some
* control points by calling gst_timed_value_control_source_set().
*
* All functions are MT-safe.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib-object.h>
#include <gst/gst.h>
#include "gsttriggercontrolsource.h"
#include "gst/glib-compat-private.h"
#include "gst/math-compat.h"
#define GST_CAT_DEFAULT controller_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
struct _GstTriggerControlSourcePrivate
{
gint64 tolerance;
};
/* control point accessors */
/* returns the default value of the property, except for times with specific values */
/* needed for one-shot events, such as notes and triggers */
static inline gdouble
_interpolate_trigger (GstTimedValueControlSource * self, GSequenceIter * iter,
GstClockTime timestamp)
{
GstControlPoint *cp;
gint64 tolerance = ((GstTriggerControlSource *) self)->priv->tolerance;
gboolean found = FALSE;
cp = g_sequence_get (iter);
if (GST_CLOCK_DIFF (cp->timestamp, timestamp) <= tolerance) {
found = TRUE;
} else {
if ((iter = g_sequence_iter_next (iter)) && !g_sequence_iter_is_end (iter)) {
cp = g_sequence_get (iter);
if (GST_CLOCK_DIFF (timestamp, cp->timestamp) <= tolerance) {
found = TRUE;
}
}
}
if (found) {
return cp->value;
}
return NAN;
}
static gboolean
interpolate_trigger_get (GstTimedValueControlSource * self,
GstClockTime timestamp, gdouble * value)
{
gboolean ret = FALSE;
GSequenceIter *iter;
g_mutex_lock (&self->lock);
iter =
gst_timed_value_control_source_find_control_point_iter (self, timestamp);
if (iter) {
*value = _interpolate_trigger (self, iter, timestamp);
if (!isnan (*value))
ret = TRUE;
}
g_mutex_unlock (&self->lock);
return ret;
}
static gboolean
interpolate_trigger_get_value_array (GstTimedValueControlSource * self,
GstClockTime timestamp, GstClockTime interval, guint n_values,
gdouble * values)
{
gboolean ret = FALSE;
guint i;
GstClockTime ts = timestamp;
GstClockTime next_ts = 0;
gdouble val;
GSequenceIter *iter1 = NULL, *iter2 = NULL;
gboolean triggered = FALSE;
g_mutex_lock (&self->lock);
for (i = 0; i < n_values; i++) {
val = NAN;
if (ts >= next_ts) {
iter1 = gst_timed_value_control_source_find_control_point_iter (self, ts);
if (!iter1) {
if (G_LIKELY (self->values))
iter2 = g_sequence_get_begin_iter (self->values);
else
iter2 = NULL;
} else {
iter2 = g_sequence_iter_next (iter1);
}
if (iter2 && !g_sequence_iter_is_end (iter2)) {
GstControlPoint *cp;
cp = g_sequence_get (iter2);
next_ts = cp->timestamp;
} else {
next_ts = GST_CLOCK_TIME_NONE;
}
if (iter1) {
val = _interpolate_trigger (self, iter1, ts);
if (!isnan (val))
ret = TRUE;
} else {
g_mutex_unlock (&self->lock);
return FALSE;
}
triggered = TRUE;
} else if (triggered) {
if (iter1) {
val = _interpolate_trigger (self, iter1, ts);
if (!isnan (val))
ret = TRUE;
} else {
g_mutex_unlock (&self->lock);
return FALSE;
}
triggered = FALSE;
}
*values = val;
ts += interval;
values++;
}
g_mutex_unlock (&self->lock);
return ret;
}
enum
{
PROP_TOLERANCE = 1,
};
#define _do_init \
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "trigger control source", 0, \
"timeline value trigger control source")
G_DEFINE_TYPE_WITH_CODE (GstTriggerControlSource, gst_trigger_control_source,
GST_TYPE_TIMED_VALUE_CONTROL_SOURCE, G_ADD_PRIVATE (GstTriggerControlSource)
_do_init);
/**
* gst_trigger_control_source_new:
*
* This returns a new, unbound #GstTriggerControlSource.
*
* Returns: (transfer full): a new, unbound #GstTriggerControlSource.
*/
GstControlSource *
gst_trigger_control_source_new (void)
{
GstControlSource *csource =
g_object_new (GST_TYPE_TRIGGER_CONTROL_SOURCE, NULL);
/* Clear floating flag */
gst_object_ref_sink (csource);
return csource;
}
static void
gst_trigger_control_source_init (GstTriggerControlSource * self)
{
GstControlSource *csource = (GstControlSource *) self;
self->priv = gst_trigger_control_source_get_instance_private (self);
csource->get_value = (GstControlSourceGetValue) interpolate_trigger_get;
csource->get_value_array = (GstControlSourceGetValueArray)
interpolate_trigger_get_value_array;
}
static void
gst_trigger_control_source_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTriggerControlSource *self = GST_TRIGGER_CONTROL_SOURCE (object);
switch (prop_id) {
case PROP_TOLERANCE:
GST_TIMED_VALUE_CONTROL_SOURCE_LOCK (self);
self->priv->tolerance = g_value_get_int64 (value);
GST_TIMED_VALUE_CONTROL_SOURCE_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_trigger_control_source_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTriggerControlSource *self = GST_TRIGGER_CONTROL_SOURCE (object);
switch (prop_id) {
case PROP_TOLERANCE:
g_value_set_int64 (value, self->priv->tolerance);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_trigger_control_source_class_init (GstTriggerControlSourceClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_trigger_control_source_set_property;
gobject_class->get_property = gst_trigger_control_source_get_property;
g_object_class_install_property (gobject_class, PROP_TOLERANCE,
g_param_spec_int64 ("tolerance", "Tolerance",
"Amount of ns a control time can be off to still trigger",
0, G_MAXINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}