libs/gst/control/dparam_smooth.c

   1 /* GStreamer
   2  * Copyright (C) 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
   3  *
   4  * gstdparam_smooth.c: Realtime smoothed dynamic parameter
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public
  17  * License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <math.h>
  23 #include <string.h>
  24 #include <gst/gstinfo.h>
  25
  26 #include "dparam_smooth.h"
  27 #include "dparammanager.h"
  28
  29 static void gst_dpsmooth_class_init (GstDParamSmoothClass *klass);
  30 static void gst_dpsmooth_init (GstDParamSmooth *dparam);
  31 static void gst_dpsmooth_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
  32 static void gst_dpsmooth_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
  33 static void gst_dpsmooth_do_update_float (GstDParam *dparam, gint64 timestamp, GValue *value, GstDParamUpdateInfo update_info);
  34 static void gst_dpsmooth_value_changed_float (GstDParam *dparam);
  35
  36 enum {
  37         ARG_0,
  38         ARG_UPDATE_PERIOD,
  39         ARG_SLOPE_TIME,
  40         ARG_SLOPE_DELTA_FLOAT,
  41         ARG_SLOPE_DELTA_INT,
  42         ARG_SLOPE_DELTA_INT64,
  43 };
  44
  45 GType
  46 gst_dpsmooth_get_type(void) {
  47         static GType dpsmooth_type = 0;
  48
  49         if (!dpsmooth_type) {
  50                 static const GTypeInfo dpsmooth_info = {
  51                         sizeof(GstDParamSmoothClass),
  52                         NULL,
  53                         NULL,
  54                         (GClassInitFunc)gst_dpsmooth_class_init,
  55                         NULL,
  56                         NULL,
  57                         sizeof(GstDParamSmooth),
  58                         0,
  59                         (GInstanceInitFunc)gst_dpsmooth_init,
  60                 };
  61                 dpsmooth_type = g_type_register_static(GST_TYPE_DPARAM, "GstDParamSmooth", &dpsmooth_info, 0);
  62         }
  63         return dpsmooth_type;
  64 }
  65
  66 static void
  67 gst_dpsmooth_class_init (GstDParamSmoothClass *klass)
  68 {
  69         GObjectClass *gobject_class;
  70         GstDParamSmoothClass *dpsmooth_class;
  71         GstObjectClass *gstobject_class;
  72
  73         gobject_class = (GObjectClass*)klass;
  74         dpsmooth_class = (GstDParamSmoothClass*)klass;
  75         gstobject_class = (GstObjectClass*) klass;
  76
  77         gobject_class->get_property = gst_dpsmooth_get_property;
  78         gobject_class->set_property = gst_dpsmooth_set_property;
  79
  80         g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_UPDATE_PERIOD,
  81                 g_param_spec_int64("update_period",
  82                                    "Update Period (nanoseconds)",
  83                                    "Number of nanoseconds between updates",
  84                                    0LL, G_MAXINT64, 2000000LL, G_PARAM_READWRITE));
  85
  86         g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SLOPE_TIME,
  87                 g_param_spec_int64("slope_time",
  88                                    "Slope Time (nanoseconds)",
  89                                    "The time period to define slope_delta by",
  90                                    0LL, G_MAXINT64, 10000000LL, G_PARAM_READWRITE));
  91
  92         g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SLOPE_DELTA_FLOAT,
  93                 g_param_spec_float("slope_delta_float",
  94                                    "Slope Delta float",
  95                                    "The amount a float value can change for a given slope_time",
  96                                    0.0F, G_MAXFLOAT, 0.2F, G_PARAM_READWRITE));
  97
  98         /*gstobject_class->save_thyself = gst_dparam_save_thyself; */
  99
 100 }
 101
 102 static void
 103 gst_dpsmooth_init (GstDParamSmooth *dpsmooth)
 104 {
 105         g_return_if_fail (dpsmooth != NULL);
 106 }
 107
 108 /**
 109  * gst_dpsmooth_new:
 110  * @type: the type that this dparam will store
 111  *
 112  * Returns: a new instance of GstDParam
 113  */
 114 GstDParam*
 115 gst_dpsmooth_new (GType type)
 116 {
 117         GstDParam *dparam;
 118         GstDParamSmooth *dpsmooth;
 119
 120         dpsmooth =g_object_new (gst_dpsmooth_get_type (), NULL);
 121         dparam = GST_DPARAM(dpsmooth);
 122
 123         GST_DPARAM_TYPE(dparam) = type;
 124
 125         switch (type){
 126                 case G_TYPE_FLOAT: {
 127                         dparam->do_update_func = gst_dpsmooth_do_update_float;
 128                         g_signal_connect (G_OBJECT (dpsmooth), "value_changed", G_CALLBACK (gst_dpsmooth_value_changed_float), NULL);
 129                         break;
 130                 }
 131                 default:
 132                         /* we don't support this type here */
 133                         dparam->do_update_func = gst_dparam_do_update_default;
 134                         break;
 135         }
 136         return dparam;
 137 }
 138
 139 static void
 140 gst_dpsmooth_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
 141 {
 142         GstDParam *dparam;
 143         GstDParamSmooth *dpsmooth;
 144
 145         g_return_if_fail(GST_IS_DPSMOOTH(object));
 146
 147         dpsmooth = GST_DPSMOOTH(object);
 148         dparam = GST_DPARAM(object);
 149
 150         GST_DPARAM_LOCK(dparam);
 151
 152         switch (prop_id) {
 153                 case ARG_UPDATE_PERIOD:
 154                         dpsmooth->update_period = g_value_get_int64 (value);
 155                         GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
 156                         break;
 157
 158                 case ARG_SLOPE_TIME:
 159                         dpsmooth->slope_time = g_value_get_int64 (value);
 160                         GST_DEBUG(GST_CAT_PARAMS, "dpsmooth->slope_time:%lld",dpsmooth->slope_time);
 161                         GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
 162                         break;
 163
 164                 case ARG_SLOPE_DELTA_FLOAT:
 165                         dpsmooth->slope_delta_float = g_value_get_float (value);
 166                         GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
 167                         break;
 168
 169                 default:
 170                         break;
 171         }
 172         GST_DPARAM_UNLOCK(dparam);
 173 }
 174
 175 static void
 176 gst_dpsmooth_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
 177 {
 178         GstDParam *dparam;
 179         GstDParamSmooth *dpsmooth;
 180
 181         g_return_if_fail(GST_IS_DPSMOOTH(object));
 182
 183         dpsmooth = GST_DPSMOOTH(object);
 184         dparam = GST_DPARAM(object);
 185
 186         switch (prop_id) {
 187                 case ARG_UPDATE_PERIOD:
 188                         g_value_set_int64(value, dpsmooth->update_period);
 189                         break;
 190                 case ARG_SLOPE_TIME:
 191                         g_value_set_int64(value, dpsmooth->slope_time);
 192                         break;
 193                 case ARG_SLOPE_DELTA_FLOAT:
 194                         g_value_set_float (value, dpsmooth->slope_delta_float);
 195                         break;
 196                 default:
 197                         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 198                         break;
 199         }
 200 }
 201
 202 static void
 203 gst_dpsmooth_value_changed_float (GstDParam *dparam)
 204 {
 205         GstDParamSmooth *dpsmooth;
 206         gfloat time_ratio;
 207
 208         g_return_if_fail(GST_IS_DPSMOOTH(dparam));
 209         dpsmooth = GST_DPSMOOTH(dparam);
 210
 211         if (GST_DPARAM_IS_LOG(dparam)){
 212                 dparam->value_float = log(dparam->value_float);
 213         }
 214         dpsmooth->start_float = dpsmooth->current_float;
 215         dpsmooth->diff_float = dparam->value_float - dpsmooth->start_float;
 216
 217         time_ratio = ABS(dpsmooth->diff_float) / dpsmooth->slope_delta_float;
 218         dpsmooth->duration_interp = (gint64)(time_ratio * (gfloat)dpsmooth->slope_time);
 219
 220         dpsmooth->need_interp_times = TRUE;
 221
 222         GST_DEBUG(GST_CAT_PARAMS, "%f to %f ratio:%f duration:%lld\n",
 223                   dpsmooth->start_float, dparam->value_float, time_ratio, dpsmooth->duration_interp);
 224 }
 225
 226 static void
 227 gst_dpsmooth_do_update_float (GstDParam *dparam, gint64 timestamp, GValue *value, GstDParamUpdateInfo update_info)
 228 {
 229         gfloat time_ratio;
 230         GstDParamSmooth *dpsmooth = GST_DPSMOOTH(dparam);
 231
 232         GST_DPARAM_LOCK(dparam);
 233
 234         if (dpsmooth->need_interp_times){
 235                 dpsmooth->start_interp = timestamp;
 236                 dpsmooth->end_interp = timestamp + dpsmooth->duration_interp;
 237                 dpsmooth->need_interp_times = FALSE;
 238         }
 239
 240         if ((update_info == GST_DPARAM_UPDATE_FIRST) || (timestamp >= dpsmooth->end_interp)){
 241                 if (GST_DPARAM_IS_LOG(dparam)){
 242                         g_value_set_float(value, exp(dparam->value_float));
 243                 }
 244                 else {
 245                         g_value_set_float(value, dparam->value_float);
 246                 }
 247                 dpsmooth->current_float = dparam->value_float;
 248
 249                 GST_DEBUG(GST_CAT_PARAMS, "interp finished at %lld", timestamp);
 250
 251                 GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
 252                 GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = timestamp;
 253
 254                 GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
 255                 GST_DPARAM_UNLOCK(dparam);
 256                 return;
 257         }
 258
 259         if (timestamp <= dpsmooth->start_interp){
 260                 if (GST_DPARAM_IS_LOG(dparam)){
 261                         g_value_set_float(value, exp(dpsmooth->start_float));
 262                 }
 263                 else {
 264                         g_value_set_float(value, dpsmooth->start_float);
 265                 }
 266                 GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
 267                 GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = dpsmooth->start_interp + dpsmooth->update_period;
 268
 269                 GST_DEBUG(GST_CAT_PARAMS, "interp started at %lld", timestamp);
 270
 271                 GST_DPARAM_UNLOCK(dparam);
 272                 return;
 273
 274         }
 275
 276         time_ratio = (gfloat)(timestamp - dpsmooth->start_interp) / (gfloat)dpsmooth->duration_interp;
 277
 278         GST_DEBUG(GST_CAT_PARAMS, "start:%lld current:%lld end:%lld ratio%f", dpsmooth->start_interp, timestamp, dpsmooth->end_interp, time_ratio);
 279         GST_DEBUG(GST_CAT_PARAMS, "pre  start:%f current:%f target:%f", dpsmooth->start_float, dpsmooth->current_float, dparam->value_float);
 280
 281         dpsmooth->current_float = dpsmooth->start_float + (dpsmooth->diff_float * time_ratio);
 282
 283         GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = timestamp + dpsmooth->update_period;
 284         if (GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) > dpsmooth->end_interp){
 285                 GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = dpsmooth->end_interp;
 286         }
 287
 288         GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
 289
 290         if (GST_DPARAM_IS_LOG(dparam)){
 291                 g_value_set_float(value, exp(dpsmooth->current_float));
 292         }
 293         else {
 294                 g_value_set_float(value, dpsmooth->current_float);
 295         }
 296
 297         GST_DEBUG(GST_CAT_PARAMS, "post start:%f current:%f target:%f", dpsmooth->start_float, dpsmooth->current_float, dparam->value_float);
 298
 299         GST_DPARAM_UNLOCK(dparam);
 300 }
 301