gst/equalizer/gstiirequalizer.c

   1 /* GStreamer
   2  * Copyright (C) <2004> Benjamin Otte <otte@gnome.org>
   3  *               <2007> Stefan Kost <ensonic@users.sf.net>
   4  *               <2007> Sebastian Dröge <slomo@circular-chaos.org>
   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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <math.h>
  27 #include <string.h>
  28
  29 #include "gstiirequalizer.h"
  30 #include "gstiirequalizernbands.h"
  31 #include "gstiirequalizer3bands.h"
  32 #include "gstiirequalizer10bands.h"
  33
  34 GST_DEBUG_CATEGORY (equalizer_debug);
  35 #define GST_CAT_DEFAULT equalizer_debug
  36
  37 #define BANDS_LOCK(equ) g_mutex_lock(equ->bands_lock)
  38 #define BANDS_UNLOCK(equ) g_mutex_unlock(equ->bands_lock)
  39
  40 static void gst_iir_equalizer_child_proxy_interface_init (gpointer g_iface,
  41     gpointer iface_data);
  42
  43 static void gst_iir_equalizer_finalize (GObject * object);
  44
  45 static gboolean gst_iir_equalizer_setup (GstAudioFilter * filter,
  46     const GstAudioInfo * info);
  47 static GstFlowReturn gst_iir_equalizer_transform_ip (GstBaseTransform * btrans,
  48     GstBuffer * buf);
  49
  50 #define ALLOWED_CAPS \
  51     "audio/x-raw,"                                                \
  52     " format=(string) {"GST_AUDIO_NE(S16)","GST_AUDIO_NE(F32)","  \
  53                         GST_AUDIO_NE(F64)" }, "                   \
  54     " rate=(int)[1000,MAX],"                                      \
  55     " channels=(int)[1,MAX]"
  56
  57 #define gst_iir_equalizer_parent_class parent_class
  58 G_DEFINE_TYPE_WITH_CODE (GstIirEqualizer, gst_iir_equalizer,
  59     GST_TYPE_AUDIO_FILTER,
  60     G_IMPLEMENT_INTERFACE (GST_TYPE_CHILD_PROXY,
  61         gst_iir_equalizer_child_proxy_interface_init));
  62
  63
  64 /* child object */
  65
  66 enum
  67 {
  68   PROP_GAIN = 1,
  69   PROP_FREQ,
  70   PROP_BANDWIDTH,
  71   PROP_TYPE
  72 };
  73
  74 typedef enum
  75 {
  76   BAND_TYPE_PEAK = 0,
  77   BAND_TYPE_LOW_SHELF,
  78   BAND_TYPE_HIGH_SHELF
  79 } GstIirEqualizerBandType;
  80
  81 #define GST_TYPE_IIR_EQUALIZER_BAND_TYPE (gst_iir_equalizer_band_type_get_type ())
  82 static GType
  83 gst_iir_equalizer_band_type_get_type (void)
  84 {
  85   static GType gtype = 0;
  86
  87   if (gtype == 0) {
  88     static const GEnumValue values[] = {
  89       {BAND_TYPE_PEAK, "Peak filter (default for inner bands)", "peak"},
  90       {BAND_TYPE_LOW_SHELF, "Low shelf filter (default for first band)",
  91           "low-shelf"},
  92       {BAND_TYPE_HIGH_SHELF, "High shelf filter (default for last band)",
  93           "high-shelf"},
  94       {0, NULL, NULL}
  95     };
  96
  97     gtype = g_enum_register_static ("GstIirEqualizerBandType", values);
  98   }
  99   return gtype;
 100 }
 101
 102
 103 typedef struct _GstIirEqualizerBandClass GstIirEqualizerBandClass;
 104
 105 #define GST_TYPE_IIR_EQUALIZER_BAND \
 106   (gst_iir_equalizer_band_get_type())
 107 #define GST_IIR_EQUALIZER_BAND(obj) \
 108   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER_BAND,GstIirEqualizerBand))
 109 #define GST_IIR_EQUALIZER_BAND_CLASS(klass) \
 110   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER_BAND,GstIirEqualizerBandClass))
 111 #define GST_IS_IIR_EQUALIZER_BAND(obj) \
 112   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER_BAND))
 113 #define GST_IS_IIR_EQUALIZER_BAND_CLASS(klass) \
 114   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER_BAND))
 115
 116 struct _GstIirEqualizerBand
 117 {
 118   GstObject object;
 119
 120   /*< private > */
 121   /* center frequency and gain */
 122   gdouble freq;
 123   gdouble gain;
 124   gdouble width;
 125   GstIirEqualizerBandType type;
 126
 127   /* second order iir filter */
 128   gdouble b1, b2;               /* IIR coefficients for outputs */
 129   gdouble a0, a1, a2;           /* IIR coefficients for inputs */
 130 };
 131
 132 struct _GstIirEqualizerBandClass
 133 {
 134   GstObjectClass parent_class;
 135 };
 136
 137 static GType gst_iir_equalizer_band_get_type (void);
 138
 139 static void
 140 gst_iir_equalizer_band_set_property (GObject * object, guint prop_id,
 141     const GValue * value, GParamSpec * pspec)
 142 {
 143   GstIirEqualizerBand *band = GST_IIR_EQUALIZER_BAND (object);
 144   GstIirEqualizer *equ =
 145       GST_IIR_EQUALIZER (gst_object_get_parent (GST_OBJECT (band)));
 146
 147   switch (prop_id) {
 148     case PROP_GAIN:{
 149       gdouble gain;
 150
 151       gain = g_value_get_double (value);
 152       GST_DEBUG_OBJECT (band, "gain = %lf -> %lf", band->gain, gain);
 153       if (gain != band->gain) {
 154         BANDS_LOCK (equ);
 155         equ->need_new_coefficients = TRUE;
 156         band->gain = gain;
 157         BANDS_UNLOCK (equ);
 158         GST_DEBUG_OBJECT (band, "changed gain = %lf ", band->gain);
 159       }
 160       break;
 161     }
 162     case PROP_FREQ:{
 163       gdouble freq;
 164
 165       freq = g_value_get_double (value);
 166       GST_DEBUG_OBJECT (band, "freq = %lf -> %lf", band->freq, freq);
 167       if (freq != band->freq) {
 168         BANDS_LOCK (equ);
 169         equ->need_new_coefficients = TRUE;
 170         band->freq = freq;
 171         BANDS_UNLOCK (equ);
 172         GST_DEBUG_OBJECT (band, "changed freq = %lf ", band->freq);
 173       }
 174       break;
 175     }
 176     case PROP_BANDWIDTH:{
 177       gdouble width;
 178
 179       width = g_value_get_double (value);
 180       GST_DEBUG_OBJECT (band, "width = %lf -> %lf", band->width, width);
 181       if (width != band->width) {
 182         BANDS_LOCK (equ);
 183         equ->need_new_coefficients = TRUE;
 184         band->width = width;
 185         BANDS_UNLOCK (equ);
 186         GST_DEBUG_OBJECT (band, "changed width = %lf ", band->width);
 187       }
 188       break;
 189     }
 190     case PROP_TYPE:{
 191       GstIirEqualizerBandType type;
 192
 193       type = g_value_get_enum (value);
 194       GST_DEBUG_OBJECT (band, "type = %d -> %d", band->type, type);
 195       if (type != band->type) {
 196         BANDS_LOCK (equ);
 197         equ->need_new_coefficients = TRUE;
 198         band->type = type;
 199         BANDS_UNLOCK (equ);
 200         GST_DEBUG_OBJECT (band, "changed type = %d ", band->type);
 201       }
 202       break;
 203     }
 204     default:
 205       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 206       break;
 207   }
 208
 209   gst_object_unref (equ);
 210 }
 211
 212 static void
 213 gst_iir_equalizer_band_get_property (GObject * object, guint prop_id,
 214     GValue * value, GParamSpec * pspec)
 215 {
 216   GstIirEqualizerBand *band = GST_IIR_EQUALIZER_BAND (object);
 217
 218   switch (prop_id) {
 219     case PROP_GAIN:
 220       g_value_set_double (value, band->gain);
 221       break;
 222     case PROP_FREQ:
 223       g_value_set_double (value, band->freq);
 224       break;
 225     case PROP_BANDWIDTH:
 226       g_value_set_double (value, band->width);
 227       break;
 228     case PROP_TYPE:
 229       g_value_set_enum (value, band->type);
 230       break;
 231     default:
 232       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 233       break;
 234   }
 235 }
 236
 237 static void
 238 gst_iir_equalizer_band_class_init (GstIirEqualizerBandClass * klass)
 239 {
 240   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 241
 242   gobject_class->set_property = gst_iir_equalizer_band_set_property;
 243   gobject_class->get_property = gst_iir_equalizer_band_get_property;
 244
 245   g_object_class_install_property (gobject_class, PROP_GAIN,
 246       g_param_spec_double ("gain", "gain",
 247           "gain for the frequency band ranging from -24.0 dB to +12.0 dB",
 248           -24.0, 12.0, 0.0,
 249           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
 250
 251   g_object_class_install_property (gobject_class, PROP_FREQ,
 252       g_param_spec_double ("freq", "freq",
 253           "center frequency of the band",
 254           0.0, 100000.0, 0.0,
 255           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
 256
 257   g_object_class_install_property (gobject_class, PROP_BANDWIDTH,
 258       g_param_spec_double ("bandwidth", "bandwidth",
 259           "difference between bandedges in Hz",
 260           0.0, 100000.0, 1.0,
 261           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
 262
 263   g_object_class_install_property (gobject_class, PROP_TYPE,
 264       g_param_spec_enum ("type", "Type",
 265           "Filter type", GST_TYPE_IIR_EQUALIZER_BAND_TYPE,
 266           BAND_TYPE_PEAK,
 267           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
 268 }
 269
 270 static void
 271 gst_iir_equalizer_band_init (GstIirEqualizerBand * band,
 272     GstIirEqualizerBandClass * klass)
 273 {
 274   band->freq = 0.0;
 275   band->gain = 0.0;
 276   band->width = 1.0;
 277   band->type = BAND_TYPE_PEAK;
 278 }
 279
 280 static GType
 281 gst_iir_equalizer_band_get_type (void)
 282 {
 283   static GType type = 0;
 284
 285   if (G_UNLIKELY (!type)) {
 286     const GTypeInfo type_info = {
 287       sizeof (GstIirEqualizerBandClass),
 288       NULL,
 289       NULL,
 290       (GClassInitFunc) gst_iir_equalizer_band_class_init,
 291       NULL,
 292       NULL,
 293       sizeof (GstIirEqualizerBand),
 294       0,
 295       (GInstanceInitFunc) gst_iir_equalizer_band_init,
 296     };
 297     type =
 298         g_type_register_static (GST_TYPE_OBJECT, "GstIirEqualizerBand",
 299         &type_info, 0);
 300   }
 301   return (type);
 302 }
 303
 304
 305 /* child proxy iface */
 306 static GstObject *
 307 gst_iir_equalizer_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
 308     guint index)
 309 {
 310   GstIirEqualizer *equ = GST_IIR_EQUALIZER (child_proxy);
 311   GstObject *ret;
 312
 313   BANDS_LOCK (equ);
 314   if (G_UNLIKELY (index >= equ->freq_band_count)) {
 315     BANDS_UNLOCK (equ);
 316     g_return_val_if_fail (index < equ->freq_band_count, NULL);
 317   }
 318
 319   ret = gst_object_ref (equ->bands[index]);
 320   BANDS_UNLOCK (equ);
 321
 322   GST_LOG_OBJECT (equ, "return child[%d] %" GST_PTR_FORMAT, index, ret);
 323   return ret;
 324 }
 325
 326 static guint
 327 gst_iir_equalizer_child_proxy_get_children_count (GstChildProxy * child_proxy)
 328 {
 329   GstIirEqualizer *equ = GST_IIR_EQUALIZER (child_proxy);
 330
 331   GST_LOG ("we have %d children", equ->freq_band_count);
 332   return equ->freq_band_count;
 333 }
 334
 335 static void
 336 gst_iir_equalizer_child_proxy_interface_init (gpointer g_iface,
 337     gpointer iface_data)
 338 {
 339   GstChildProxyInterface *iface = g_iface;
 340
 341   GST_DEBUG ("initializing iface");
 342
 343   iface->get_child_by_index = gst_iir_equalizer_child_proxy_get_child_by_index;
 344   iface->get_children_count = gst_iir_equalizer_child_proxy_get_children_count;
 345 }
 346
 347
 348 /* equalizer implementation */
 349
 350 static void
 351 gst_iir_equalizer_class_init (GstIirEqualizerClass * klass)
 352 {
 353   GstAudioFilterClass *audio_filter_class = (GstAudioFilterClass *) klass;
 354   GstBaseTransformClass *btrans_class = (GstBaseTransformClass *) klass;
 355   GObjectClass *gobject_class = (GObjectClass *) klass;
 356   GstCaps *caps;
 357
 358   gobject_class->finalize = gst_iir_equalizer_finalize;
 359   audio_filter_class->setup = gst_iir_equalizer_setup;
 360   btrans_class->transform_ip = gst_iir_equalizer_transform_ip;
 361
 362   caps = gst_caps_from_string (ALLOWED_CAPS);
 363   gst_audio_filter_class_add_pad_templates (audio_filter_class, caps);
 364   gst_caps_unref (caps);
 365 }
 366
 367 static void
 368 gst_iir_equalizer_init (GstIirEqualizer * eq)
 369 {
 370   eq->bands_lock = g_mutex_new ();
 371   eq->need_new_coefficients = TRUE;
 372 }
 373
 374 static void
 375 gst_iir_equalizer_finalize (GObject * object)
 376 {
 377   GstIirEqualizer *equ = GST_IIR_EQUALIZER (object);
 378   gint i;
 379
 380   for (i = 0; i < equ->freq_band_count; i++) {
 381     if (equ->bands[i])
 382       gst_object_unparent (GST_OBJECT (equ->bands[i]));
 383     equ->bands[i] = NULL;
 384   }
 385   equ->freq_band_count = 0;
 386
 387   g_free (equ->bands);
 388   g_free (equ->history);
 389
 390   g_mutex_free (equ->bands_lock);
 391
 392   G_OBJECT_CLASS (parent_class)->finalize (object);
 393 }
 394
 395 /* Filter taken from
 396  *
 397  * The Equivalence of Various Methods of Computing
 398  * Biquad Coefficients for Audio Parametric Equalizers
 399  *
 400  * by Robert Bristow-Johnson
 401  *
 402  * http://www.aes.org/e-lib/browse.cfm?elib=6326
 403  * http://www.musicdsp.org/files/EQ-Coefficients.pdf
 404  * http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
 405  *
 406  * The bandwidth method that we use here is the preferred
 407  * one from this article transformed from octaves to frequency
 408  * in Hz.
 409  */
 410 static inline gdouble
 411 arg_to_scale (gdouble arg)
 412 {
 413   return (pow (10.0, arg / 40.0));
 414 }
 415
 416 static gdouble
 417 calculate_omega (gdouble freq, gint rate)
 418 {
 419   gdouble omega;
 420
 421   if (freq / rate >= 0.5)
 422     omega = G_PI;
 423   else if (freq <= 0.0)
 424     omega = 0.0;
 425   else
 426     omega = 2.0 * G_PI * (freq / rate);
 427
 428   return omega;
 429 }
 430
 431 static gdouble
 432 calculate_bw (GstIirEqualizerBand * band, gint rate)
 433 {
 434   gdouble bw = 0.0;
 435
 436   if (band->width / rate >= 0.5) {
 437     /* If bandwidth == 0.5 the calculation below fails as tan(G_PI/2)
 438      * is undefined. So set the bandwidth to a slightly smaller value.
 439      */
 440     bw = G_PI - 0.00000001;
 441   } else if (band->width <= 0.0) {
 442     /* If bandwidth == 0 this band won't change anything so set
 443      * the coefficients accordingly. The coefficient calculation
 444      * below would create coefficients that for some reason amplify
 445      * the band.
 446      */
 447     band->a0 = 1.0;
 448     band->a1 = 0.0;
 449     band->a2 = 0.0;
 450     band->b1 = 0.0;
 451     band->b2 = 0.0;
 452   } else {
 453     bw = 2.0 * G_PI * (band->width / rate);
 454   }
 455   return bw;
 456 }
 457
 458 static void
 459 setup_peak_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band)
 460 {
 461   gint rate = GST_AUDIO_FILTER_RATE (equ);
 462
 463   g_return_if_fail (rate);
 464
 465   {
 466     gdouble gain, omega, bw;
 467     gdouble alpha, alpha1, alpha2, b0;
 468
 469     gain = arg_to_scale (band->gain);
 470     omega = calculate_omega (band->freq, rate);
 471     bw = calculate_bw (band, rate);
 472     if (bw == 0.0)
 473       goto out;
 474
 475     alpha = tan (bw / 2.0);
 476
 477     alpha1 = alpha * gain;
 478     alpha2 = alpha / gain;
 479
 480     b0 = (1.0 + alpha2);
 481
 482     band->a0 = (1.0 + alpha1) / b0;
 483     band->a1 = (-2.0 * cos (omega)) / b0;
 484     band->a2 = (1.0 - alpha1) / b0;
 485     band->b1 = (2.0 * cos (omega)) / b0;
 486     band->b2 = -(1.0 - alpha2) / b0;
 487
 488   out:
 489     GST_INFO
 490         ("gain = %5.1f, width= %7.2f, freq = %7.2f, a0 = %7.5g, a1 = %7.5g, a2=%7.5g b1 = %7.5g, b2 = %7.5g",
 491         band->gain, band->width, band->freq, band->a0, band->a1, band->a2,
 492         band->b1, band->b2);
 493   }
 494 }
 495
 496 static void
 497 setup_low_shelf_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band)
 498 {
 499   gint rate = GST_AUDIO_FILTER_RATE (equ);
 500
 501   g_return_if_fail (rate);
 502
 503   {
 504     gdouble gain, omega, bw;
 505     gdouble alpha, delta, b0;
 506     gdouble egp, egm;
 507
 508     gain = arg_to_scale (band->gain);
 509     omega = calculate_omega (band->freq, rate);
 510     bw = calculate_bw (band, rate);
 511     if (bw == 0.0)
 512       goto out;
 513
 514     egm = gain - 1.0;
 515     egp = gain + 1.0;
 516     alpha = tan (bw / 2.0);
 517
 518     delta = 2.0 * sqrt (gain) * alpha;
 519     b0 = egp + egm * cos (omega) + delta;
 520
 521     band->a0 = ((egp - egm * cos (omega) + delta) * gain) / b0;
 522     band->a1 = ((egm - egp * cos (omega)) * 2.0 * gain) / b0;
 523     band->a2 = ((egp - egm * cos (omega) - delta) * gain) / b0;
 524     band->b1 = ((egm + egp * cos (omega)) * 2.0) / b0;
 525     band->b2 = -((egp + egm * cos (omega) - delta)) / b0;
 526
 527
 528   out:
 529     GST_INFO
 530         ("gain = %5.1f, width= %7.2f, freq = %7.2f, a0 = %7.5g, a1 = %7.5g, a2=%7.5g b1 = %7.5g, b2 = %7.5g",
 531         band->gain, band->width, band->freq, band->a0, band->a1, band->a2,
 532         band->b1, band->b2);
 533   }
 534 }
 535
 536 static void
 537 setup_high_shelf_filter (GstIirEqualizer * equ, GstIirEqualizerBand * band)
 538 {
 539   gint rate = GST_AUDIO_FILTER_RATE (equ);
 540
 541   g_return_if_fail (rate);
 542
 543   {
 544     gdouble gain, omega, bw;
 545     gdouble alpha, delta, b0;
 546     gdouble egp, egm;
 547
 548     gain = arg_to_scale (band->gain);
 549     omega = calculate_omega (band->freq, rate);
 550     bw = calculate_bw (band, rate);
 551     if (bw == 0.0)
 552       goto out;
 553
 554     egm = gain - 1.0;
 555     egp = gain + 1.0;
 556     alpha = tan (bw / 2.0);
 557
 558     delta = 2.0 * sqrt (gain) * alpha;
 559     b0 = egp - egm * cos (omega) + delta;
 560
 561     band->a0 = ((egp + egm * cos (omega) + delta) * gain) / b0;
 562     band->a1 = ((egm + egp * cos (omega)) * -2.0 * gain) / b0;
 563     band->a2 = ((egp + egm * cos (omega) - delta) * gain) / b0;
 564     band->b1 = ((egm - egp * cos (omega)) * -2.0) / b0;
 565     band->b2 = -((egp - egm * cos (omega) - delta)) / b0;
 566
 567
 568   out:
 569     GST_INFO
 570         ("gain = %5.1f, width= %7.2f, freq = %7.2f, a0 = %7.5g, a1 = %7.5g, a2=%7.5g b1 = %7.5g, b2 = %7.5g",
 571         band->gain, band->width, band->freq, band->a0, band->a1, band->a2,
 572         band->b1, band->b2);
 573   }
 574 }
 575
 576 /* Must be called with bands_lock and transform lock! */
 577 static void
 578 set_passthrough (GstIirEqualizer * equ)
 579 {
 580   gint i;
 581   gboolean passthrough = TRUE;
 582
 583   for (i = 0; i < equ->freq_band_count; i++) {
 584     passthrough = passthrough && (equ->bands[i]->gain == 0.0);
 585   }
 586
 587   gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (equ), passthrough);
 588   GST_DEBUG ("Passthrough mode: %d\n", passthrough);
 589 }
 590
 591 /* Must be called with bands_lock and transform lock! */
 592 static void
 593 update_coefficients (GstIirEqualizer * equ)
 594 {
 595   gint i, n = equ->freq_band_count;
 596
 597   for (i = 0; i < n; i++) {
 598     if (equ->bands[i]->type == BAND_TYPE_PEAK)
 599       setup_peak_filter (equ, equ->bands[i]);
 600     else if (equ->bands[i]->type == BAND_TYPE_LOW_SHELF)
 601       setup_low_shelf_filter (equ, equ->bands[i]);
 602     else
 603       setup_high_shelf_filter (equ, equ->bands[i]);
 604   }
 605
 606   equ->need_new_coefficients = FALSE;
 607 }
 608
 609 /* Must be called with transform lock! */
 610 static void
 611 alloc_history (GstIirEqualizer * equ)
 612 {
 613   /* free + alloc = no memcpy */
 614   g_free (equ->history);
 615   equ->history =
 616       g_malloc0 (equ->history_size * GST_AUDIO_FILTER_CHANNELS (equ) *
 617       equ->freq_band_count);
 618 }
 619
 620 void
 621 gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count)
 622 {
 623   guint old_count, i;
 624   gdouble freq0, freq1, step;
 625   gchar name[20];
 626
 627   if (equ->freq_band_count == new_count)
 628     return;
 629
 630   BANDS_LOCK (equ);
 631
 632   if (G_UNLIKELY (equ->freq_band_count == new_count)) {
 633     BANDS_UNLOCK (equ);
 634     return;
 635   }
 636
 637   old_count = equ->freq_band_count;
 638   equ->freq_band_count = new_count;
 639   GST_DEBUG ("bands %u -> %u", old_count, new_count);
 640
 641   if (old_count < new_count) {
 642     /* add new bands */
 643     equ->bands = g_realloc (equ->bands, sizeof (GstObject *) * new_count);
 644     for (i = old_count; i < new_count; i++) {
 645       /* otherwise they get names like 'iirequalizerband5' */
 646       sprintf (name, "band%u", i);
 647       equ->bands[i] = g_object_new (GST_TYPE_IIR_EQUALIZER_BAND,
 648           "name", name, NULL);
 649       GST_DEBUG ("adding band[%d]=%p", i, equ->bands[i]);
 650
 651       gst_object_set_parent (GST_OBJECT (equ->bands[i]), GST_OBJECT (equ));
 652       gst_child_proxy_child_added (GST_OBJECT (equ),
 653           GST_OBJECT (equ->bands[i]));
 654     }
 655   } else {
 656     /* free unused bands */
 657     for (i = new_count; i < old_count; i++) {
 658       GST_DEBUG ("removing band[%d]=%p", i, equ->bands[i]);
 659       gst_child_proxy_child_removed (GST_OBJECT (equ),
 660           GST_OBJECT (equ->bands[i]));
 661       gst_object_unparent (GST_OBJECT (equ->bands[i]));
 662       equ->bands[i] = NULL;
 663     }
 664   }
 665
 666   alloc_history (equ);
 667
 668   /* set center frequencies and name band objects
 669    * FIXME: arg! we can't change the name of parented objects :(
 670    *   application should read band->freq to get the name
 671    */
 672
 673   step = pow (HIGHEST_FREQ / LOWEST_FREQ, 1.0 / new_count);
 674   freq0 = LOWEST_FREQ;
 675   for (i = 0; i < new_count; i++) {
 676     freq1 = freq0 * step;
 677
 678     if (i == 0)
 679       equ->bands[i]->type = BAND_TYPE_LOW_SHELF;
 680     else if (i == new_count - 1)
 681       equ->bands[i]->type = BAND_TYPE_HIGH_SHELF;
 682     else
 683       equ->bands[i]->type = BAND_TYPE_PEAK;
 684
 685     equ->bands[i]->freq = freq0 + ((freq1 - freq0) / 2.0);
 686     equ->bands[i]->width = freq1 - freq0;
 687     GST_DEBUG ("band[%2d] = '%lf'", i, equ->bands[i]->freq);
 688
 689     g_object_notify (G_OBJECT (equ->bands[i]), "bandwidth");
 690     g_object_notify (G_OBJECT (equ->bands[i]), "freq");
 691     g_object_notify (G_OBJECT (equ->bands[i]), "type");
 692
 693     /*
 694        if(equ->bands[i]->freq<10000.0)
 695        sprintf (name,"%dHz",(gint)equ->bands[i]->freq);
 696        else
 697        sprintf (name,"%dkHz",(gint)(equ->bands[i]->freq/1000.0));
 698        gst_object_set_name( GST_OBJECT (equ->bands[i]), name);
 699        GST_DEBUG ("band[%2d] = '%s'",i,name);
 700      */
 701     freq0 = freq1;
 702   }
 703
 704   equ->need_new_coefficients = TRUE;
 705   BANDS_UNLOCK (equ);
 706 }
 707
 708 /* start of code that is type specific */
 709
 710 #define CREATE_OPTIMIZED_FUNCTIONS_INT(TYPE,BIG_TYPE,MIN_VAL,MAX_VAL)   \
 711 typedef struct {                                                        \
 712   BIG_TYPE x1, x2;          /* history of input values for a filter */  \
 713   BIG_TYPE y1, y2;          /* history of output values for a filter */ \
 714 } SecondOrderHistory ## TYPE;                                           \
 715                                                                         \
 716 static inline BIG_TYPE                                                  \
 717 one_step_ ## TYPE (GstIirEqualizerBand *filter,                         \
 718     SecondOrderHistory ## TYPE *history, BIG_TYPE input)                \
 719 {                                                                       \
 720   /* calculate output */                                                \
 721   BIG_TYPE output = filter->a0 * input +                                \
 722       filter->a1 * history->x1 + filter->a2 * history->x2 +             \
 723       filter->b1 * history->y1 + filter->b2 * history->y2;              \
 724   /* update history */                                                  \
 725   history->y2 = history->y1;                                            \
 726   history->y1 = output;                                                 \
 727   history->x2 = history->x1;                                            \
 728   history->x1 = input;                                                  \
 729                                                                         \
 730   return output;                                                        \
 731 }                                                                       \
 732                                                                         \
 733 static const guint                                                      \
 734 history_size_ ## TYPE = sizeof (SecondOrderHistory ## TYPE);            \
 735                                                                         \
 736 static void                                                             \
 737 gst_iir_equ_process_ ## TYPE (GstIirEqualizer *equ, guint8 *data,       \
 738 guint size, guint channels)                                             \
 739 {                                                                       \
 740   guint frames = size / channels / sizeof (TYPE);                       \
 741   guint i, c, f, nf = equ->freq_band_count;                             \
 742   BIG_TYPE cur;                                                         \
 743   GstIirEqualizerBand **filters = equ->bands;                           \
 744                                                                         \
 745   for (i = 0; i < frames; i++) {                                        \
 746     SecondOrderHistory ## TYPE *history = equ->history;                 \
 747     for (c = 0; c < channels; c++) {                                    \
 748       cur = *((TYPE *) data);                                           \
 749       for (f = 0; f < nf; f++) {                                        \
 750         cur = one_step_ ## TYPE (filters[f], history, cur);             \
 751         history++;                                                      \
 752       }                                                                 \
 753       cur = CLAMP (cur, MIN_VAL, MAX_VAL);                              \
 754       *((TYPE *) data) = (TYPE) floor (cur);                            \
 755       data += sizeof (TYPE);                                            \
 756     }                                                                   \
 757   }                                                                     \
 758 }
 759
 760 #define CREATE_OPTIMIZED_FUNCTIONS(TYPE)                                \
 761 typedef struct {                                                        \
 762   TYPE x1, x2;          /* history of input values for a filter */  \
 763   TYPE y1, y2;          /* history of output values for a filter */ \
 764 } SecondOrderHistory ## TYPE;                                           \
 765                                                                         \
 766 static inline TYPE                                                      \
 767 one_step_ ## TYPE (GstIirEqualizerBand *filter,                         \
 768     SecondOrderHistory ## TYPE *history, TYPE input)                    \
 769 {                                                                       \
 770   /* calculate output */                                                \
 771   TYPE output = filter->a0 * input + filter->a1 * history->x1 +         \
 772       filter->a2 * history->x2 + filter->b1 * history->y1 +             \
 773       filter->b2 * history->y2;                                         \
 774   /* update history */                                                  \
 775   history->y2 = history->y1;                                            \
 776   history->y1 = output;                                                 \
 777   history->x2 = history->x1;                                            \
 778   history->x1 = input;                                                  \
 779                                                                         \
 780   return output;                                                        \
 781 }                                                                       \
 782                                                                         \
 783 static const guint                                                      \
 784 history_size_ ## TYPE = sizeof (SecondOrderHistory ## TYPE);            \
 785                                                                         \
 786 static void                                                             \
 787 gst_iir_equ_process_ ## TYPE (GstIirEqualizer *equ, guint8 *data,       \
 788 guint size, guint channels)                                             \
 789 {                                                                       \
 790   guint frames = size / channels / sizeof (TYPE);                       \
 791   guint i, c, f, nf = equ->freq_band_count;                             \
 792   TYPE cur;                                                             \
 793   GstIirEqualizerBand **filters = equ->bands;                           \
 794                                                                         \
 795   for (i = 0; i < frames; i++) {                                        \
 796     SecondOrderHistory ## TYPE *history = equ->history;                 \
 797     for (c = 0; c < channels; c++) {                                    \
 798       cur = *((TYPE *) data);                                           \
 799       for (f = 0; f < nf; f++) {                                        \
 800         cur = one_step_ ## TYPE (filters[f], history, cur);             \
 801         history++;                                                      \
 802       }                                                                 \
 803       *((TYPE *) data) = (TYPE) cur;                                    \
 804       data += sizeof (TYPE);                                            \
 805     }                                                                   \
 806   }                                                                     \
 807 }
 808
 809 CREATE_OPTIMIZED_FUNCTIONS_INT (gint16, gfloat, -32768.0, 32767.0);
 810 CREATE_OPTIMIZED_FUNCTIONS (gfloat);
 811 CREATE_OPTIMIZED_FUNCTIONS (gdouble);
 812
 813 static GstFlowReturn
 814 gst_iir_equalizer_transform_ip (GstBaseTransform * btrans, GstBuffer * buf)
 815 {
 816   GstAudioFilter *filter = GST_AUDIO_FILTER (btrans);
 817   GstIirEqualizer *equ = GST_IIR_EQUALIZER (btrans);
 818   GstClockTime timestamp;
 819   guint8 *data;
 820   gsize size;
 821   gint channels = GST_AUDIO_FILTER_CHANNELS (filter);
 822
 823   if (G_UNLIKELY (channels < 1 || equ->process == NULL))
 824     return GST_FLOW_NOT_NEGOTIATED;
 825
 826   BANDS_LOCK (equ);
 827   if (equ->need_new_coefficients) {
 828     update_coefficients (equ);
 829     set_passthrough (equ);
 830   }
 831   BANDS_UNLOCK (equ);
 832
 833   if (gst_base_transform_is_passthrough (btrans))
 834     return GST_FLOW_OK;
 835
 836   timestamp = GST_BUFFER_TIMESTAMP (buf);
 837   timestamp =
 838       gst_segment_to_stream_time (&btrans->segment, GST_FORMAT_TIME, timestamp);
 839
 840   if (GST_CLOCK_TIME_IS_VALID (timestamp))
 841     gst_object_sync_values (G_OBJECT (equ), timestamp);
 842
 843   data = gst_buffer_map (buf, &size, NULL, GST_MAP_WRITE);
 844   equ->process (equ, data, size, channels);
 845   gst_buffer_unmap (buf, data, size);
 846
 847   return GST_FLOW_OK;
 848 }
 849
 850 static gboolean
 851 gst_iir_equalizer_setup (GstAudioFilter * audio, const GstAudioInfo * info)
 852 {
 853   GstIirEqualizer *equ = GST_IIR_EQUALIZER (audio);
 854
 855   switch (GST_AUDIO_INFO_FORMAT (info)) {
 856     case GST_AUDIO_FORMAT_S16:
 857       equ->history_size = history_size_gint16;
 858       equ->process = gst_iir_equ_process_gint16;
 859       break;
 860     case GST_AUDIO_FORMAT_F32:
 861       equ->history_size = history_size_gfloat;
 862       equ->process = gst_iir_equ_process_gfloat;
 863       break;
 864     case GST_AUDIO_FORMAT_F64:
 865       equ->history_size = history_size_gdouble;
 866       equ->process = gst_iir_equ_process_gdouble;
 867       break;
 868     default:
 869       return FALSE;
 870   }
 871
 872   alloc_history (equ);
 873   return TRUE;
 874 }
 875
 876
 877 static gboolean
 878 plugin_init (GstPlugin * plugin)
 879 {
 880   GST_DEBUG_CATEGORY_INIT (equalizer_debug, "equalizer", 0, "equalizer");
 881
 882   if (!(gst_element_register (plugin, "equalizer-nbands", GST_RANK_NONE,
 883               GST_TYPE_IIR_EQUALIZER_NBANDS)))
 884     return FALSE;
 885
 886   if (!(gst_element_register (plugin, "equalizer-3bands", GST_RANK_NONE,
 887               GST_TYPE_IIR_EQUALIZER_3BANDS)))
 888     return FALSE;
 889
 890   if (!(gst_element_register (plugin, "equalizer-10bands", GST_RANK_NONE,
 891               GST_TYPE_IIR_EQUALIZER_10BANDS)))
 892     return FALSE;
 893
 894   return TRUE;
 895 }
 896
 897 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
 898     GST_VERSION_MINOR,
 899     "equalizer",
 900     "GStreamer audio equalizers",
 901     plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)