gstreamer/libs/gst/controller/gsttimedvaluecontrolsource.c
2012-01-19 09:27:04 +01:00

422 lines
12 KiB
C

/* GStreamer
*
* Copyright (C) 2007,2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* 2011 Stefan Sauer <ensonic@users.sf.net>
*
* gsttimedvaluecontrolsource.c: Base class for timeed value based control
* sources
*
* 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.
*/
/**
* SECTION:gsttimedvaluecontrolsource
* @short_description: timed value control source base class
*
* Base class for #GstContrlSources that use time-stamped values.
*
* When overriding bind, chain up first to give this bind implementation a
* chance to setup things.
*
* All functions are MT-safe.
*
*/
#include <glib-object.h>
#include <gst/gst.h>
#include "gstinterpolationcontrolsource.h"
#include "gst/glib-compat-private.h"
#define GST_CAT_DEFAULT controller_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define _do_init \
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "timed value control source", 0, \
"timed value control source base class")
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstTimedValueControlSource,
gst_timed_value_control_source, GST_TYPE_CONTROL_SOURCE, _do_init);
/*
* gst_control_point_free:
* @prop: the object to free
*
* Private method which frees all data allocated by a #GstControlPoint
* instance.
*/
static void
gst_control_point_free (GstControlPoint * cp)
{
g_return_if_fail (cp);
g_slice_free (GstControlPoint, cp);
}
static void
gst_timed_value_control_source_reset (GstTimedValueControlSource * self)
{
GstControlSource *csource = (GstControlSource *) self;
csource->get_value = NULL;
csource->get_value_array = NULL;
if (self->values) {
g_sequence_free (self->values);
self->values = NULL;
}
self->nvalues = 0;
self->valid_cache = FALSE;
}
/*
* gst_control_point_compare:
* @p1: a pointer to a #GstControlPoint
* @p2: a pointer to a #GstControlPoint
*
* Compare function for g_list operations that operates on two #GstControlPoint
* parameters.
*/
static gint
gst_control_point_compare (gconstpointer p1, gconstpointer p2)
{
GstClockTime ct1 = ((GstControlPoint *) p1)->timestamp;
GstClockTime ct2 = ((GstControlPoint *) p2)->timestamp;
return ((ct1 < ct2) ? -1 : ((ct1 == ct2) ? 0 : 1));
}
/*
* gst_control_point_find:
* @p1: a pointer to a #GstControlPoint
* @p2: a pointer to a #GstClockTime
*
* Compare function for g_list operations that operates on a #GstControlPoint and
* a #GstClockTime.
*/
static gint
gst_control_point_find (gconstpointer p1, gconstpointer p2)
{
GstClockTime ct1 = ((GstControlPoint *) p1)->timestamp;
GstClockTime ct2 = *(GstClockTime *) p2;
return ((ct1 < ct2) ? -1 : ((ct1 == ct2) ? 0 : 1));
}
static GstControlPoint *
_make_new_cp (GstTimedValueControlSource * self, GstClockTime timestamp,
const gdouble value)
{
GstControlPoint *cp;
/* create a new GstControlPoint */
cp = g_slice_new0 (GstControlPoint);
cp->timestamp = timestamp;
cp->value = value;
return cp;
}
static void
gst_timed_value_control_source_set_internal (GstTimedValueControlSource *
self, GstClockTime timestamp, const gdouble value)
{
GSequenceIter *iter;
/* check if a control point for the timestamp already exists */
/* iter contains the iter right *after* timestamp */
if (G_LIKELY (self->values)) {
iter =
g_sequence_search (self->values, &timestamp,
(GCompareDataFunc) gst_control_point_find, NULL);
if (iter) {
GSequenceIter *prev = g_sequence_iter_prev (iter);
GstControlPoint *cp = g_sequence_get (prev);
/* If the timestamp is the same just update the control point value */
if (cp->timestamp == timestamp) {
/* update control point */
cp->value = value;
goto done;
}
}
} else {
self->values = g_sequence_new ((GDestroyNotify) gst_control_point_free);
GST_INFO ("create new timed value sequence");
}
/* sort new cp into the prop->values list */
g_sequence_insert_sorted (self->values, _make_new_cp (self, timestamp,
value), (GCompareDataFunc) gst_control_point_compare, NULL);
self->nvalues++;
done:
self->valid_cache = FALSE;
}
/**
* gst_timed_value_control_source_find_control_point_iter:
* @self: the control source to search in
* @timestamp: the search key
*
* Find last value before given timestamp in control point list.
* If all values in the control point list come after the given
* timestamp or no values exist, %NULL is returned.
*
* For use in control source implementations.
*
* Returns: the found #GSequenceIter or %NULL
*/
GSequenceIter *gst_timed_value_control_source_find_control_point_iter
(GstTimedValueControlSource * self, GstClockTime timestamp)
{
GSequenceIter *iter;
if (!self->values)
return NULL;
iter =
g_sequence_search (self->values, &timestamp,
(GCompareDataFunc) gst_control_point_find, NULL);
/* g_sequence_search() returns the iter where timestamp
* would be inserted, i.e. the iter > timestamp, so
* we need to get the previous one. And of course, if
* there is no previous one, we return NULL. */
if (g_sequence_iter_is_begin (iter))
return NULL;
return g_sequence_iter_prev (iter);
}
/**
* gst_timed_value_control_source_set:
* @self: the #GstTimedValueControlSource object
* @timestamp: the time the control-change is scheduled for
* @value: the control-value
*
* Set the value of given controller-handled property at a certain time.
*
* Returns: FALSE if the values couldn't be set, TRUE otherwise.
*/
gboolean
gst_timed_value_control_source_set (GstTimedValueControlSource * self,
GstClockTime timestamp, const gdouble value)
{
g_return_val_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self), FALSE);
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
g_mutex_lock (&self->lock);
gst_timed_value_control_source_set_internal (self, timestamp, value);
g_mutex_unlock (&self->lock);
return TRUE;
}
/**
* gst_timed_value_control_source_set_from_list:
* @self: the #GstTimedValueControlSource object
* @timedvalues: (transfer none) (element-type GstController.TimedValue): a list
* with #GstTimedValue items
*
* Sets multiple timed values at once.
*
* Returns: FALSE if the values couldn't be set, TRUE otherwise.
*/
gboolean
gst_timed_value_control_source_set_from_list (GstTimedValueControlSource *
self, const GSList * timedvalues)
{
const GSList *node;
GstTimedValue *tv;
gboolean res = FALSE;
g_return_val_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self), FALSE);
for (node = timedvalues; node; node = g_slist_next (node)) {
tv = node->data;
if (!GST_CLOCK_TIME_IS_VALID (tv->timestamp)) {
GST_WARNING ("GstTimedValued with invalid timestamp passed to %s",
GST_FUNCTION);
} else {
g_mutex_lock (&self->lock);
gst_timed_value_control_source_set_internal (self, tv->timestamp,
tv->value);
g_mutex_unlock (&self->lock);
res = TRUE;
}
}
return res;
}
/**
* gst_timed_value_control_source_unset:
* @self: the #GstTimedValueControlSource object
* @timestamp: the time the control-change should be removed from
*
* Used to remove the value of given controller-handled property at a certain
* time.
*
* Returns: FALSE if the value couldn't be unset (i.e. not found, TRUE otherwise.
*/
gboolean
gst_timed_value_control_source_unset (GstTimedValueControlSource * self,
GstClockTime timestamp)
{
GSequenceIter *iter;
gboolean res = FALSE;
g_return_val_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self), FALSE);
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
g_mutex_lock (&self->lock);
/* check if a control point for the timestamp exists */
if (G_LIKELY (self->values) && (iter =
g_sequence_search (self->values, &timestamp,
(GCompareDataFunc) gst_control_point_find, NULL))) {
GstControlPoint *cp;
/* Iter contains the iter right after timestamp, i.e.
* we need to get the previous one and check the timestamp
*/
iter = g_sequence_iter_prev (iter);
cp = g_sequence_get (iter);
if (cp->timestamp == timestamp) {
g_sequence_remove (iter);
self->nvalues--;
self->valid_cache = FALSE;
res = TRUE;
}
}
g_mutex_unlock (&self->lock);
return res;
}
/**
* gst_timed_value_control_source_unset_all:
* @self: the #GstTimedValueControlSource object
*
* Used to remove all time-stamped values of given controller-handled property
*
*/
void
gst_timed_value_control_source_unset_all (GstTimedValueControlSource * self)
{
g_return_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self));
g_mutex_lock (&self->lock);
/* free GstControlPoint structures */
if (self->values) {
g_sequence_free (self->values);
self->values = NULL;
}
self->nvalues = 0;
self->valid_cache = FALSE;
g_mutex_unlock (&self->lock);
}
static void
_append_control_point (GstControlPoint * cp, GQueue * res)
{
g_queue_push_tail (res, cp);
}
/**
* gst_timed_value_control_source_get_all:
* @self: the #GstTimedValueControlSource to get the list from
*
* Returns a read-only copy of the list of #GstTimedValue for the given property.
* Free the list after done with it.
*
* Returns: (transfer container) (element-type GstController.TimedValue): a copy
* of the list, or %NULL if the property isn't handled by the controller
*/
GList *
gst_timed_value_control_source_get_all (GstTimedValueControlSource * self)
{
GQueue res = G_QUEUE_INIT;
g_return_val_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self), NULL);
g_mutex_lock (&self->lock);
if (G_LIKELY (self->values))
g_sequence_foreach (self->values, (GFunc) _append_control_point, &res);
g_mutex_unlock (&self->lock);
return res.head;
}
/**
* gst_timed_value_control_source_get_count:
* @self: the #GstTimedValueControlSource to get the number of values from
*
* Get the number of control points that are set.
*
* Returns: the number of control points that are set.
*/
gint
gst_timed_value_control_source_get_count (GstTimedValueControlSource * self)
{
g_return_val_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self), 0);
return self->nvalues;
}
/**
* gst_timed_value_control_invalidate_cache:
* @self: the #GstTimedValueControlSource
*
* Reset the controlled value cache.
*/
void
gst_timed_value_control_invalidate_cache (GstTimedValueControlSource * self)
{
g_return_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self));
self->valid_cache = FALSE;
}
static void
gst_timed_value_control_source_init (GstTimedValueControlSource * self)
{
g_mutex_init (&self->lock);
}
static void
gst_timed_value_control_source_finalize (GObject * obj)
{
GstTimedValueControlSource *self = GST_TIMED_VALUE_CONTROL_SOURCE (obj);
g_mutex_lock (&self->lock);
gst_timed_value_control_source_reset (self);
g_mutex_unlock (&self->lock);
g_mutex_clear (&self->lock);
G_OBJECT_CLASS (gst_timed_value_control_source_parent_class)->finalize (obj);
}
static void
gst_timed_value_control_source_class_init (GstTimedValueControlSourceClass
* klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
//GstControlSourceClass *csource_class = GST_CONTROL_SOURCE_CLASS (klass);
gobject_class->finalize = gst_timed_value_control_source_finalize;
}