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:%"
 161                                                   G_GINT64_FORMAT,
 162                                   dpsmooth->slope_time);
 163                         GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
 164                         break;
 165
 166                 case ARG_SLOPE_DELTA_FLOAT:
 167                         dpsmooth->slope_delta_float = g_value_get_float (value);
 168                         GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
 169                         break;
 170
 171                 default:
 172                         break;
 173         }
 174         GST_DPARAM_UNLOCK(dparam);
 175 }
 176
 177 static void
 178 gst_dpsmooth_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
 179 {
 180         GstDParam *dparam;
 181         GstDParamSmooth *dpsmooth;
 182
 183         g_return_if_fail(GST_IS_DPSMOOTH(object));
 184
 185         dpsmooth = GST_DPSMOOTH(object);
 186         dparam = GST_DPARAM(object);
 187
 188         switch (prop_id) {
 189                 case ARG_UPDATE_PERIOD:
 190                         g_value_set_int64(value, dpsmooth->update_period);
 191                         break;
 192                 case ARG_SLOPE_TIME:
 193                         g_value_set_int64(value, dpsmooth->slope_time);
 194                         break;
 195                 case ARG_SLOPE_DELTA_FLOAT:
 196                         g_value_set_float (value, dpsmooth->slope_delta_float);
 197                         break;
 198                 default:
 199                         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 200                         break;
 201         }
 202 }
 203
 204 static void
 205 gst_dpsmooth_value_changed_float (GstDParam *dparam)
 206 {
 207         GstDParamSmooth *dpsmooth;
 208         gfloat time_ratio;
 209
 210         g_return_if_fail(GST_IS_DPSMOOTH(dparam));
 211         dpsmooth = GST_DPSMOOTH(dparam);
 212
 213         if (GST_DPARAM_IS_LOG(dparam)){
 214                 dparam->value_float = log(dparam->value_float);
 215         }
 216         dpsmooth->start_float = dpsmooth->current_float;
 217         dpsmooth->diff_float = dparam->value_float - dpsmooth->start_float;
 218
 219         time_ratio = ABS(dpsmooth->diff_float) / dpsmooth->slope_delta_float;
 220         dpsmooth->duration_interp = (gint64)(time_ratio * (gfloat)dpsmooth->slope_time);
 221
 222         dpsmooth->need_interp_times = TRUE;
 223
 224         GST_DEBUG(GST_CAT_PARAMS, "%f to %f ratio:%f duration:%"
 225                                   G_GINT64_FORMAT "\n",
 226                   dpsmooth->start_float, dparam->value_float, time_ratio, dpsmooth->duration_interp);
 227 }
 228
 229 static void
 230 gst_dpsmooth_do_update_float (GstDParam *dparam, gint64 timestamp, GValue *value, GstDParamUpdateInfo update_info)
 231 {
 232         gfloat time_ratio;
 233         GstDParamSmooth *dpsmooth = GST_DPSMOOTH(dparam);
 234
 235         GST_DPARAM_LOCK(dparam);
 236
 237         if (dpsmooth->need_interp_times){
 238                 dpsmooth->start_interp = timestamp;
 239                 dpsmooth->end_interp = timestamp + dpsmooth->duration_interp;
 240                 dpsmooth->need_interp_times = FALSE;
 241         }
 242
 243         if ((update_info == GST_DPARAM_UPDATE_FIRST) || (timestamp >= dpsmooth->end_interp)){
 244                 if (GST_DPARAM_IS_LOG(dparam)){
 245                         g_value_set_float(value, exp(dparam->value_float));
 246                 }
 247                 else {
 248                         g_value_set_float(value, dparam->value_float);
 249                 }
 250                 dpsmooth->current_float = dparam->value_float;
 251
 252                 GST_DEBUG(GST_CAT_PARAMS, "interp finished at %"
 253                                           G_GINT64_FORMAT, timestamp);
 254
 255                 GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
 256                 GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = timestamp;
 257
 258                 GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
 259                 GST_DPARAM_UNLOCK(dparam);
 260                 return;
 261         }
 262
 263         if (timestamp <= dpsmooth->start_interp){
 264                 if (GST_DPARAM_IS_LOG(dparam)){
 265                         g_value_set_float(value, exp(dpsmooth->start_float));
 266                 }
 267                 else {
 268                         g_value_set_float(value, dpsmooth->start_float);
 269                 }
 270                 GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
 271                 GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = dpsmooth->start_interp + dpsmooth->update_period;
 272
 273                 GST_DEBUG(GST_CAT_PARAMS, "interp started at %" G_GINT64_FORMAT, timestamp);
 274
 275                 GST_DPARAM_UNLOCK(dparam);
 276                 return;
 277
 278         }
 279
 280         time_ratio = (gfloat)(timestamp - dpsmooth->start_interp) / (gfloat)dpsmooth->duration_interp;
 281
 282         GST_DEBUG(GST_CAT_PARAMS, "start:%" G_GINT64_FORMAT " current:%" G_GINT64_FORMAT " end:%" G_GINT64_FORMAT " ratio%f", dpsmooth->start_interp, timestamp, dpsmooth->end_interp, time_ratio);
 283         GST_DEBUG(GST_CAT_PARAMS, "pre  start:%f current:%f target:%f", dpsmooth->start_float, dpsmooth->current_float, dparam->value_float);
 284
 285         dpsmooth->current_float = dpsmooth->start_float + (dpsmooth->diff_float * time_ratio);
 286
 287         GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = timestamp + dpsmooth->update_period;
 288         if (GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) > dpsmooth->end_interp){
 289                 GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = dpsmooth->end_interp;
 290         }
 291
 292         GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
 293
 294         if (GST_DPARAM_IS_LOG(dparam)){
 295                 g_value_set_float(value, exp(dpsmooth->current_float));
 296         }
 297         else {
 298                 g_value_set_float(value, dpsmooth->current_float);
 299         }
 300
 301         GST_DEBUG(GST_CAT_PARAMS, "post start:%f current:%f target:%f", dpsmooth->start_float, dpsmooth->current_float, dparam->value_float);
 302
 303         GST_DPARAM_UNLOCK(dparam);
 304 }
 305