apps/menus/eq_menu.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 Dan Everton
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include <stdio.h>
  24 #include <stdbool.h>
  25 #include <string.h>
  26 #include "eq_menu.h"
  27 #include "system.h"
  28 #include "kernel.h"
  29 #include "lcd.h"
  30 #include "menu.h"
  31 #include "action.h"
  32 #include "mp3_playback.h"
  33 #include "settings.h"
  34 #include "screens.h"
  35 #include "icons.h"
  36 #include "font.h"
  37 #include "lang.h"
  38 #include "talk.h"
  39 #include "misc.h"
  40 #include "sound.h"
  41 #include "dsp.h"
  42 #include "tree.h"
  43 #include "screen_access.h"
  44 #include "keyboard.h"
  45 #include "gui/scrollbar.h"
  46 #include "menu_common.h"
  47 #include "viewport.h"
  48
  49 /*
  50  * Utility functions
  51  */
  52
  53 const char* eq_q_format(char* buffer, size_t buffer_size, int value, const char* unit)
  54 {
  55     snprintf(buffer, buffer_size, "%d.%d %s", value / EQ_USER_DIVISOR,
  56          value % EQ_USER_DIVISOR, unit);
  57     return buffer;
  58 }
  59
  60 const char* eq_precut_format(char* buffer, size_t buffer_size, int value, const char* unit)
  61 {
  62     snprintf(buffer, buffer_size, "%s%d.%d %s", value == 0 ? " " : "-",
  63         value / EQ_USER_DIVISOR, value % EQ_USER_DIVISOR, unit);
  64     return buffer;
  65 }
  66
  67 /*
  68  * Settings functions
  69  */
  70 static void eq_apply(void)
  71 {
  72     int i;
  73     dsp_set_eq(global_settings.eq_enabled);
  74     dsp_set_eq_precut(global_settings.eq_precut);
  75     /* Update all bands */
  76     for(i = 0; i < 5; i++) {
  77         dsp_set_eq_coefs(i);
  78     }
  79 }
  80
  81 static int eq_setting_callback(int action, const struct menu_item_ex *this_item)
  82 {
  83     switch (action)
  84     {
  85         case ACTION_ENTER_MENUITEM:
  86             action = lowlatency_callback(action, this_item);
  87             break;
  88         case ACTION_EXIT_MENUITEM:
  89             eq_apply();
  90             action = lowlatency_callback(action, this_item);
  91             break;
  92     }
  93
  94     return action;
  95 }
  96 MENUITEM_SETTING(eq_enable, &global_settings.eq_enabled, eq_setting_callback);
  97 MENUITEM_SETTING(eq_precut, &global_settings.eq_precut, eq_setting_callback);
  98
  99 MENUITEM_SETTING(cutoff_0, &global_settings.eq_band0_cutoff, eq_setting_callback);
 100 MENUITEM_SETTING(cutoff_1, &global_settings.eq_band1_cutoff, eq_setting_callback);
 101 MENUITEM_SETTING(cutoff_2, &global_settings.eq_band2_cutoff, eq_setting_callback);
 102 MENUITEM_SETTING(cutoff_3, &global_settings.eq_band3_cutoff, eq_setting_callback);
 103 MENUITEM_SETTING(cutoff_4, &global_settings.eq_band4_cutoff, eq_setting_callback);
 104
 105 MENUITEM_SETTING(q_0, &global_settings.eq_band0_q, eq_setting_callback);
 106 MENUITEM_SETTING(q_1, &global_settings.eq_band1_q, eq_setting_callback);
 107 MENUITEM_SETTING(q_2, &global_settings.eq_band2_q, eq_setting_callback);
 108 MENUITEM_SETTING(q_3, &global_settings.eq_band3_q, eq_setting_callback);
 109 MENUITEM_SETTING(q_4, &global_settings.eq_band4_q, eq_setting_callback);
 110
 111 MENUITEM_SETTING(gain_0, &global_settings.eq_band0_gain, eq_setting_callback);
 112 MENUITEM_SETTING(gain_1, &global_settings.eq_band1_gain, eq_setting_callback);
 113 MENUITEM_SETTING(gain_2, &global_settings.eq_band2_gain, eq_setting_callback);
 114 MENUITEM_SETTING(gain_3, &global_settings.eq_band3_gain, eq_setting_callback);
 115 MENUITEM_SETTING(gain_4, &global_settings.eq_band4_gain, eq_setting_callback);
 116
 117 static char* gainitem_get_name(int selected_item, void * data, char *buffer)
 118 {
 119     (void)selected_item;
 120     int *setting = (int*)data;
 121     snprintf(buffer, MAX_PATH, str(LANG_EQUALIZER_GAIN_ITEM), *setting);
 122     return buffer;
 123 }
 124
 125 static int gainitem_speak_item(int selected_item, void * data)
 126 {
 127     (void)selected_item;
 128     int *setting = (int*)data;
 129     talk_number(*setting, false);
 130     talk_id(LANG_EQUALIZER_GAIN_ITEM, true);
 131     return 0;
 132 }
 133
 134 static int do_option(void * param)
 135 {
 136     const struct menu_item_ex *setting = (const struct menu_item_ex*)param;
 137     lowlatency_callback(ACTION_ENTER_MENUITEM, setting);
 138     do_setting_from_menu(setting, NULL);
 139     eq_apply();
 140     lowlatency_callback(ACTION_EXIT_MENUITEM, setting);
 141     return 0;
 142 }
 143
 144 MENUITEM_FUNCTION_DYNTEXT(gain_item_0, MENU_FUNC_USEPARAM,
 145                           do_option, (void*)&gain_0,
 146                           gainitem_get_name, gainitem_speak_item,
 147                           &global_settings.eq_band0_cutoff, NULL, Icon_NOICON);
 148 MENUITEM_FUNCTION_DYNTEXT(gain_item_1, MENU_FUNC_USEPARAM,
 149                           do_option, (void*)&gain_1,
 150                           gainitem_get_name, gainitem_speak_item,
 151                           &global_settings.eq_band1_cutoff, NULL, Icon_NOICON);
 152 MENUITEM_FUNCTION_DYNTEXT(gain_item_2, MENU_FUNC_USEPARAM,
 153                           do_option, (void*)&gain_2,
 154                           gainitem_get_name, gainitem_speak_item,
 155                           &global_settings.eq_band2_cutoff, NULL, Icon_NOICON);
 156 MENUITEM_FUNCTION_DYNTEXT(gain_item_3, MENU_FUNC_USEPARAM,
 157                           do_option, (void*)&gain_3,
 158                           gainitem_get_name, gainitem_speak_item,
 159                           &global_settings.eq_band3_cutoff, NULL, Icon_NOICON);
 160 MENUITEM_FUNCTION_DYNTEXT(gain_item_4, MENU_FUNC_USEPARAM,
 161                           do_option, (void*)&gain_4,
 162                           gainitem_get_name, gainitem_speak_item,
 163                           &global_settings.eq_band4_cutoff, NULL, Icon_NOICON);
 164
 165 MAKE_MENU(gain_menu, ID2P(LANG_EQUALIZER_GAIN), NULL, Icon_NOICON, &gain_item_0,
 166             &gain_item_1, &gain_item_2, &gain_item_3, &gain_item_4);
 167
 168 static const struct menu_item_ex *band_items[3][3] = {
 169     { &cutoff_1, &q_1, &gain_1 },
 170     { &cutoff_2, &q_2, &gain_2 },
 171     { &cutoff_3, &q_3, &gain_3 }
 172 };
 173
 174 static char* centerband_get_name(int selected_item, void * data, char *buffer)
 175 {
 176     (void)selected_item;
 177     int band = (intptr_t)data;
 178     snprintf(buffer, MAX_PATH, str(LANG_EQUALIZER_BAND_PEAK), band);
 179     return buffer;
 180 }
 181
 182 static int centerband_speak_item(int selected_item, void * data)
 183 {
 184     (void)selected_item;
 185     int band = (intptr_t)data;
 186     talk_id(LANG_EQUALIZER_BAND_PEAK, false);
 187     talk_number(band, true);
 188     return 0;
 189 }
 190
 191 static int do_center_band_menu(void* param)
 192 {
 193     int band = (intptr_t)param;
 194     struct menu_item_ex menu;
 195     struct menu_callback_with_desc cb_and_desc;
 196     char desc[MAX_PATH];
 197
 198     cb_and_desc.menu_callback = NULL;
 199     snprintf(desc, MAX_PATH, str(LANG_EQUALIZER_BAND_PEAK), band);
 200     cb_and_desc.desc = desc;
 201     cb_and_desc.icon_id = Icon_EQ;
 202     menu.flags = MT_MENU|(3<<MENU_COUNT_SHIFT)|MENU_HAS_DESC;
 203     menu.submenus = band_items[band-1];
 204     menu.callback_and_desc = &cb_and_desc;
 205     do_menu(&menu, NULL, NULL, false);
 206     return 0;
 207 }
 208
 209 MAKE_MENU(band_0_menu, ID2P(LANG_EQUALIZER_BAND_LOW_SHELF), NULL,
 210             Icon_EQ, &cutoff_0, &q_0, &gain_0);
 211 MENUITEM_FUNCTION_DYNTEXT(band_1_menu, MENU_FUNC_USEPARAM,
 212                           do_center_band_menu, (void*)1,
 213                           centerband_get_name, centerband_speak_item,
 214                           (void*)1, NULL, Icon_EQ);
 215 MENUITEM_FUNCTION_DYNTEXT(band_2_menu, MENU_FUNC_USEPARAM,
 216                           do_center_band_menu, (void*)2,
 217                           centerband_get_name, centerband_speak_item,
 218                           (void*)2, NULL, Icon_EQ);
 219 MENUITEM_FUNCTION_DYNTEXT(band_3_menu, MENU_FUNC_USEPARAM,
 220                           do_center_band_menu, (void*)3,
 221                           centerband_get_name, centerband_speak_item,
 222                           (void*)3, NULL, Icon_EQ);
 223 MAKE_MENU(band_4_menu, ID2P(LANG_EQUALIZER_BAND_HIGH_SHELF), NULL,
 224             Icon_EQ, &cutoff_4, &q_4, &gain_4);
 225
 226 MAKE_MENU(advanced_eq_menu_, ID2P(LANG_EQUALIZER_ADVANCED), NULL, Icon_EQ,
 227             &band_0_menu, &band_1_menu, &band_2_menu, &band_3_menu, &band_4_menu);
 228
 229
 230 enum eq_slider_mode {
 231     GAIN,
 232     CUTOFF,
 233     Q,
 234 };
 235
 236 enum eq_type {
 237     LOW_SHELF,
 238     PEAK,
 239     HIGH_SHELF
 240 };
 241
 242 /* Size of just the slider/srollbar */
 243 #define SCROLLBAR_SIZE 6
 244
 245 /* Draw the UI for a whole EQ band */
 246 static int draw_eq_slider(struct screen * screen, int x, int y,
 247     int width, int cutoff, int q, int gain, bool selected,
 248     enum eq_slider_mode mode, int band)
 249 {
 250     char buf[26];
 251     int steps, min_item, max_item;
 252     int abs_gain = abs(gain);
 253     int x1, x2, y1, total_height;
 254     int w, h;
 255
 256     switch(mode) {
 257     case Q:
 258         steps = EQ_Q_MAX - EQ_Q_MIN;
 259         min_item = q - EQ_Q_STEP - EQ_Q_MIN;
 260         max_item = q + EQ_Q_STEP - EQ_Q_MIN;
 261         break;
 262     case CUTOFF:
 263         steps = EQ_CUTOFF_MAX - EQ_CUTOFF_MIN;
 264         min_item = cutoff - EQ_CUTOFF_FAST_STEP * 2;
 265         max_item = cutoff + EQ_CUTOFF_FAST_STEP * 2;
 266         break;
 267     case GAIN:
 268     default:
 269         steps = EQ_GAIN_MAX - EQ_GAIN_MIN;
 270         min_item = abs(EQ_GAIN_MIN) + gain - EQ_GAIN_STEP * 5;
 271         max_item = abs(EQ_GAIN_MIN) + gain + EQ_GAIN_STEP * 5;
 272         break;
 273     }
 274
 275     /* Start two pixels in, one for border, one for margin */
 276     x1 = x + 2;
 277     y1 = y + 2;
 278
 279     /* Print out the band label */
 280     if (band == 0) {
 281         screen->putsxy(x1, y1, "LS: ");
 282         screen->getstringsize("LS:", &w, &h);
 283     } else if (band == 4) {
 284         screen->putsxy(x1, y1, "HS: ");
 285         screen->getstringsize("HS:", &w, &h);
 286     } else {
 287         snprintf(buf, sizeof(buf),  "PK%d:", band);
 288         screen->putsxy(x1, y1, buf);
 289         screen->getstringsize(buf, &w, &h);
 290     }
 291
 292     screen->getstringsize("A", &w, &h);
 293     x1 += 5*w; /* 4 chars for label + 1 space = 5 */
 294
 295     /* Print out gain part of status line (left justify after label) */
 296     if (mode == GAIN && selected)
 297         screen->set_drawmode(DRMODE_SOLID | DRMODE_INVERSEVID);
 298     else
 299         screen->set_drawmode(DRMODE_SOLID);
 300
 301     snprintf(buf, sizeof(buf), "%s%2d.%d%s", gain < 0 ? "-" : " ",
 302         abs_gain / EQ_USER_DIVISOR, abs_gain % EQ_USER_DIVISOR,
 303         screen->lcdwidth >= 160 ? "dB" : "");
 304     screen->putsxy(x1, y1, buf);
 305     screen->getstringsize(buf, &w, &h);
 306     x1 += w;
 307
 308     /* Print out Q part of status line (right justify) */
 309     if (mode == Q && selected)
 310         screen->set_drawmode(DRMODE_SOLID | DRMODE_INVERSEVID);
 311     else
 312         screen->set_drawmode(DRMODE_SOLID);
 313
 314     snprintf(buf, sizeof(buf), "%d.%d%s", q / EQ_USER_DIVISOR,
 315              q % EQ_USER_DIVISOR, screen->lcdwidth >= 160 ? " Q" : "");
 316     screen->getstringsize(buf, &w, &h);
 317     x2 = x + width - w - 2;
 318     screen->putsxy(x2, y1, buf);
 319
 320     /* Print out cutoff part of status line (center between gain & Q) */
 321     if (mode == CUTOFF && selected)
 322         screen->set_drawmode(DRMODE_SOLID | DRMODE_INVERSEVID);
 323     else
 324         screen->set_drawmode(DRMODE_SOLID);
 325
 326     snprintf(buf, sizeof(buf),  "%5d%s", cutoff,
 327              screen->lcdwidth >= 160 ? "Hz" : "");
 328     screen->getstringsize(buf, &w, &h);
 329     x1 = x1 + (x2 - x1 - w)/2;
 330     screen->putsxy(x1, y1, buf);
 331
 332     /* Draw selection box */
 333     total_height = 3 + h + 1 + SCROLLBAR_SIZE + 3;
 334     screen->set_drawmode(DRMODE_SOLID);
 335     if (selected) {
 336         screen->drawrect(x, y, width, total_height);
 337     }
 338
 339     /* Draw horizontal slider. Reuse scrollbar for this */
 340     gui_scrollbar_draw(screen, x + 3, y1 + h + 1, width - 6, SCROLLBAR_SIZE,
 341                        steps, min_item, max_item, HORIZONTAL);
 342
 343     return total_height;
 344 }
 345
 346 /* Draw's all the EQ sliders. Returns the total height of the sliders drawn */
 347 static void draw_eq_sliders(struct screen * screen, int x, int y,
 348                             int nb_eq_sliders, int start_item,
 349                             int current_band, enum eq_slider_mode mode)
 350 {
 351     int i, gain, q, cutoff;
 352     int height = y;
 353     int *setting = &global_settings.eq_band0_cutoff;
 354
 355     start_item = MIN(start_item, 5-nb_eq_sliders);
 356     for (i=0; i<5; i++) {
 357         cutoff = *setting++;
 358         q = *setting++;
 359         gain = *setting++;
 360
 361         if (i == start_item + nb_eq_sliders)
 362             break;
 363
 364         if (i >= start_item) {
 365             height += draw_eq_slider(screen, x, height, screen->lcdwidth - x - 1,
 366                                      cutoff, q, gain, i == current_band, mode,
 367                                      i);
 368             /* add a margin */
 369             height++;
 370         }
 371     }
 372     if (nb_eq_sliders != 5)
 373         gui_scrollbar_draw(screen, 0, y, SCROLLBAR_SIZE - 1,
 374                            screen->lcdheight - y, 5,
 375                            start_item, start_item + nb_eq_sliders,
 376                            VERTICAL);
 377     return;
 378 }
 379
 380 /* Provides a graphical means of editing the EQ settings */
 381 bool eq_menu_graphical(void)
 382 {
 383     bool exit_request = false;
 384     bool result = true;
 385     bool has_changed = false;
 386     int button;
 387     int *setting;
 388     int current_band, x, y, step, fast_step, min, max, voice_unit;
 389     enum eq_slider_mode mode;
 390     enum eq_type current_type;
 391     char buf[24];
 392     int i, w, h, height, start_item, nb_eq_sliders[NB_SCREENS];
 393     FOR_NB_SCREENS(i)
 394         viewportmanager_theme_enable(i, false, NULL);
 395
 396
 397     FOR_NB_SCREENS(i) {
 398         screens[i].set_viewport(NULL);
 399         screens[i].setfont(FONT_SYSFIXED);
 400         screens[i].clear_display();
 401
 402         /* Figure out how many sliders can be drawn on the screen */
 403         screens[i].getstringsize("A", &w, &h);
 404
 405         /* Total height includes margins (1), text, slider, and line selector (1) */
 406         height = 3 + h + 1 + SCROLLBAR_SIZE + 3;
 407         nb_eq_sliders[i] = screens[i].lcdheight / height;
 408
 409         /* Make sure the "Edit Mode" text fits too */
 410         height = nb_eq_sliders[i]*height + h + 2;
 411         if (height > screens[i].lcdheight)
 412             nb_eq_sliders[i]--;
 413
 414         if (nb_eq_sliders[i] > 5)
 415             nb_eq_sliders[i] = 5;
 416     }
 417
 418     y = h + 1;
 419
 420     /* Start off editing gain on the first band */
 421     mode = GAIN;
 422     current_type = LOW_SHELF;
 423     current_band = 0;
 424
 425     while (!exit_request) {
 426         FOR_NB_SCREENS(i)
 427         {
 428             screens[i].clear_display();
 429
 430             /* Set pointer to the band data currently editable */
 431             if (mode == GAIN) {
 432                 /* gain */
 433                 setting = &global_settings.eq_band0_gain;
 434                 setting += current_band * 3;
 435
 436                 step = EQ_GAIN_STEP;
 437                 fast_step = EQ_GAIN_FAST_STEP;
 438                 min = EQ_GAIN_MIN;
 439                 max = EQ_GAIN_MAX;
 440                 voice_unit = UNIT_DB;
 441
 442                 snprintf(buf, sizeof(buf), str(LANG_SYSFONT_EQUALIZER_EDIT_MODE),
 443                          str(LANG_SYSFONT_GAIN), "(dB)");
 444
 445                 screens[i].putsxy(0, 0, buf);
 446             } else if (mode == CUTOFF) {
 447                 /* cutoff */
 448                 setting = &global_settings.eq_band0_cutoff;
 449                 setting += current_band * 3;
 450
 451                 step = EQ_CUTOFF_STEP;
 452                 fast_step = EQ_CUTOFF_FAST_STEP;
 453                 min = EQ_CUTOFF_MIN;
 454                 max = EQ_CUTOFF_MAX;
 455                 voice_unit = UNIT_HERTZ;
 456
 457                 snprintf(buf, sizeof(buf), str(LANG_SYSFONT_EQUALIZER_EDIT_MODE),
 458                          str(LANG_SYSFONT_EQUALIZER_BAND_CUTOFF), "(Hz)");
 459
 460                 screens[i].putsxy(0, 0, buf);
 461             } else {
 462                 /* Q */
 463                 setting = &global_settings.eq_band0_q;
 464                 setting += current_band * 3;
 465
 466                 step = EQ_Q_STEP;
 467                 fast_step = EQ_Q_FAST_STEP;
 468                 min = EQ_Q_MIN;
 469                 max = EQ_Q_MAX;
 470                 voice_unit = UNIT_INT;
 471
 472                 snprintf(buf, sizeof(buf), str(LANG_SYSFONT_EQUALIZER_EDIT_MODE),
 473                          str(LANG_EQUALIZER_BAND_Q), "");
 474
 475                 screens[i].putsxy(0, 0, buf);
 476             }
 477
 478             /* Draw scrollbar if needed */
 479             if (nb_eq_sliders[i] != 5)
 480             {
 481                 if (current_band == 0) {
 482                     start_item = 0;
 483                 } else if (current_band == 4) {
 484                     start_item = 5 - nb_eq_sliders[i];
 485                 } else {
 486                     start_item = current_band - 1;
 487                 }
 488                 x = SCROLLBAR_SIZE;
 489             } else {
 490                 x = 1;
 491                 start_item = 0;
 492             }
 493             /* Draw equalizer band details */
 494             draw_eq_sliders(&screens[i], x, y, nb_eq_sliders[i], start_item,
 495                             current_band, mode);
 496
 497             screens[i].update();
 498         }
 499
 500         button = get_action(CONTEXT_SETTINGS_EQ,TIMEOUT_BLOCK);
 501
 502         switch (button) {
 503         case ACTION_SETTINGS_DEC:
 504         case ACTION_SETTINGS_DECREPEAT:
 505             *(setting) -= step;
 506             has_changed = true;
 507             if (*(setting) < min)
 508                 *(setting) = min;
 509             break;
 510
 511         case ACTION_SETTINGS_INC:
 512         case ACTION_SETTINGS_INCREPEAT:
 513             *(setting) += step;
 514             has_changed = true;
 515             if (*(setting) > max)
 516                 *(setting) = max;
 517             break;
 518
 519         case ACTION_SETTINGS_INCBIGSTEP:
 520             *(setting) += fast_step;
 521             has_changed = true;
 522             if (*(setting) > max)
 523                 *(setting) = max;
 524             break;
 525
 526         case ACTION_SETTINGS_DECBIGSTEP:
 527             *(setting) -= fast_step;
 528             has_changed = true;
 529             if (*(setting) < min)
 530                 *(setting) = min;
 531             break;
 532
 533         case ACTION_STD_PREV:
 534         case ACTION_STD_PREVREPEAT:
 535             current_band--;
 536             if (current_band < 0)
 537                 current_band = 4; /* wrap around */
 538             break;
 539
 540         case ACTION_STD_NEXT:
 541         case ACTION_STD_NEXTREPEAT:
 542             current_band++;
 543             if (current_band > 4)
 544                 current_band = 0; /* wrap around */
 545             break;
 546
 547         case ACTION_STD_OK:
 548             mode++;
 549             if (mode > Q)
 550                 mode = GAIN; /* wrap around */
 551             break;
 552
 553         case ACTION_STD_CANCEL:
 554             exit_request = true;
 555             result = false;
 556             break;
 557         default:
 558             if(default_event_handler(button) == SYS_USB_CONNECTED) {
 559                 exit_request = true;
 560                 result = true;
 561             }
 562             break;
 563         }
 564
 565         /* Update the filter if the user changed something */
 566         if (has_changed) {
 567             dsp_set_eq_coefs(current_band);
 568             has_changed = false;
 569         }
 570     }
 571
 572     /* Reset screen settings */
 573     FOR_NB_SCREENS(i)
 574     {
 575         screens[i].setfont(FONT_UI);
 576         screens[i].clear_display();
 577         screens[i].set_viewport(NULL);
 578         viewportmanager_theme_undo(i, false);
 579     }
 580     return result;
 581 }
 582
 583 static bool eq_save_preset(void)
 584 {
 585     /* make sure that the eq is enabled for setting saving */
 586     bool enabled = global_settings.eq_enabled;
 587     global_settings.eq_enabled = true;
 588
 589     bool result = settings_save_config(SETTINGS_SAVE_EQPRESET);
 590
 591     global_settings.eq_enabled = enabled;
 592
 593     return result;
 594 }
 595
 596 /* Allows browsing of preset files */
 597 bool eq_browse_presets(void)
 598 {
 599     return rockbox_browse(EQS_DIR, SHOW_CFG);
 600 }
 601
 602 MENUITEM_FUNCTION(eq_graphical, 0, ID2P(LANG_EQUALIZER_GRAPHICAL),
 603                     (int(*)(void))eq_menu_graphical, NULL, lowlatency_callback,
 604                     Icon_EQ);
 605 MENUITEM_FUNCTION(eq_save, 0, ID2P(LANG_EQUALIZER_SAVE),
 606                     (int(*)(void))eq_save_preset, NULL, NULL, Icon_NOICON);
 607 MENUITEM_FUNCTION(eq_browse, 0, ID2P(LANG_EQUALIZER_BROWSE),
 608                     (int(*)(void))eq_browse_presets, NULL, lowlatency_callback,
 609                     Icon_NOICON);
 610
 611 MAKE_MENU(equalizer_menu, ID2P(LANG_EQUALIZER), NULL, Icon_EQ,
 612         &eq_enable, &eq_graphical, &eq_precut, &gain_menu,
 613         &advanced_eq_menu_, &eq_save, &eq_browse);
 614