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5e4c13fc97
Don't return the specific types. In most cases there is no specific api there anyway.
256 lines
7.1 KiB
C
256 lines
7.1 KiB
C
/* GStreamer
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*
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* Copyright (C) 2007,2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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* 2011 Stefan Sauer <ensonic@users.sf.net>
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*
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* gsttriggercontrolsource.c: Control source that provides some values at time-
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* stamps
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gsttriggercontrolsource
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* @short_description: interpolation control source
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*
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* #GstTriggerControlSource is a #GstControlSource, that returns values from user-given
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* control points. It allows for a tolerance on the time-stamps.
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*
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* To use #GstTriggerControlSource get a new instance by calling
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* gst_trigger_control_source_new(), bind it to a #GParamSpec and set some
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* control points by calling gst_timed_value_control_source_set().
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*
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* All functions are MT-safe.
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*/
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#include <glib-object.h>
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#include <gst/gst.h>
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#include "gsttriggercontrolsource.h"
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#include "gst/glib-compat-private.h"
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#include "gst/math-compat.h"
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#define GST_CAT_DEFAULT controller_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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struct _GstTriggerControlSourcePrivate
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{
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gint64 tolerance;
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};
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/* control point accessors */
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/* returns the default value of the property, except for times with specific values */
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/* needed for one-shot events, such as notes and triggers */
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static inline gdouble
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_interpolate_trigger (GstTimedValueControlSource * self, GSequenceIter * iter,
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GstClockTime timestamp)
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{
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GstControlPoint *cp;
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gint64 tolerance = ((GstTriggerControlSource *) self)->priv->tolerance;
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gboolean found = FALSE;
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cp = g_sequence_get (iter);
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if (GST_CLOCK_DIFF (cp->timestamp, timestamp) <= tolerance) {
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found = TRUE;
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} else {
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if ((iter = g_sequence_iter_next (iter))) {
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cp = g_sequence_get (iter);
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if (GST_CLOCK_DIFF (timestamp, cp->timestamp) <= tolerance) {
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found = TRUE;
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}
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}
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}
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if (found) {
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return cp->value;
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}
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return NAN;
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}
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static gboolean
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interpolate_trigger_get (GstTimedValueControlSource * self,
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GstClockTime timestamp, gdouble * value)
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{
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gboolean ret = FALSE;
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GSequenceIter *iter;
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g_mutex_lock (&self->lock);
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iter =
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gst_timed_value_control_source_find_control_point_iter (self, timestamp);
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if (iter) {
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*value = _interpolate_trigger (self, iter, timestamp);
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if (!isnan (*value))
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ret = TRUE;
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}
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g_mutex_unlock (&self->lock);
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return ret;
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}
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static gboolean
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interpolate_trigger_get_value_array (GstTimedValueControlSource * self,
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GstClockTime timestamp, GstClockTime interval, guint n_values,
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gdouble * values)
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{
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gboolean ret = FALSE;
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guint i;
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GstClockTime ts = timestamp;
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GstClockTime next_ts = 0;
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gdouble val;
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GSequenceIter *iter1 = NULL, *iter2 = NULL;
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gboolean triggered = FALSE;
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g_mutex_lock (&self->lock);
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for (i = 0; i < n_values; i++) {
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val = NAN;
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if (ts >= next_ts) {
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iter1 = gst_timed_value_control_source_find_control_point_iter (self, ts);
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if (!iter1) {
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if (G_LIKELY (self->values))
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iter2 = g_sequence_get_begin_iter (self->values);
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else
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iter2 = NULL;
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} else {
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iter2 = g_sequence_iter_next (iter1);
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}
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if (iter2 && !g_sequence_iter_is_end (iter2)) {
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GstControlPoint *cp;
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cp = g_sequence_get (iter2);
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next_ts = cp->timestamp;
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} else {
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next_ts = GST_CLOCK_TIME_NONE;
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}
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if (iter1) {
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val = _interpolate_trigger (self, iter1, ts);
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if (!isnan (val))
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ret = TRUE;
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} else {
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g_mutex_unlock (&self->lock);
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return FALSE;
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}
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triggered = TRUE;
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} else if (triggered) {
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if (iter1) {
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val = _interpolate_trigger (self, iter1, ts);
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if (!isnan (val))
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ret = TRUE;
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} else {
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g_mutex_unlock (&self->lock);
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return FALSE;
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}
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triggered = FALSE;
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}
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*values = val;
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ts += interval;
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values++;
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}
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g_mutex_unlock (&self->lock);
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return ret;
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}
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enum
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{
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PROP_TOLERANCE = 1,
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};
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#define _do_init \
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GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "trigger control source", 0, \
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"timeline value trigger control source")
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G_DEFINE_TYPE_WITH_CODE (GstTriggerControlSource, gst_trigger_control_source,
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GST_TYPE_TIMED_VALUE_CONTROL_SOURCE, _do_init);
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/**
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* gst_trigger_control_source_new:
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*
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* This returns a new, unbound #GstTriggerControlSource.
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*
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* Returns: (transfer full): a new, unbound #GstTriggerControlSource.
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*/
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GstControlSource *
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gst_trigger_control_source_new (void)
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{
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return g_object_newv (GST_TYPE_TRIGGER_CONTROL_SOURCE, 0, NULL);
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}
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static void
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gst_trigger_control_source_init (GstTriggerControlSource * self)
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{
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GstControlSource *csource = (GstControlSource *) self;
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self->priv =
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G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_TRIGGER_CONTROL_SOURCE,
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GstTriggerControlSourcePrivate);
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csource->get_value = (GstControlSourceGetValue) interpolate_trigger_get;
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csource->get_value_array = (GstControlSourceGetValueArray)
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interpolate_trigger_get_value_array;
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}
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static void
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gst_trigger_control_source_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstTriggerControlSource *self = GST_TRIGGER_CONTROL_SOURCE (object);
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switch (prop_id) {
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case PROP_TOLERANCE:
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GST_TIMED_VALUE_CONTROL_SOURCE_LOCK (self);
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self->priv->tolerance = g_value_get_int64 (value);
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GST_TIMED_VALUE_CONTROL_SOURCE_UNLOCK (self);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_trigger_control_source_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstTriggerControlSource *self = GST_TRIGGER_CONTROL_SOURCE (object);
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switch (prop_id) {
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case PROP_TOLERANCE:
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g_value_set_int64 (value, self->priv->tolerance);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_trigger_control_source_class_init (GstTriggerControlSourceClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GstTriggerControlSourcePrivate));
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gobject_class->set_property = gst_trigger_control_source_set_property;
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gobject_class->get_property = gst_trigger_control_source_get_property;
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g_object_class_install_property (gobject_class, PROP_TOLERANCE,
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g_param_spec_int64 ("tolerance", "Tolerance",
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"Amount of ns a control time can be off to still trigger",
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0, G_MAXINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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