mdw@git.distorted.org.uk Git - disorder/blob - disobedience/control.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2006-2008 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20 /** @file disobedience/control.c
  21  * @brief Volume control and buttons
  22  */
  23
  24 #include "disobedience.h"
  25 #include "mixer.h"
  26
  27 /* Forward declarations ---------------------------------------------------- */
  28
  29 WT(adjustment);
  30 WT(hscale);
  31 WT(hbox);
  32 WT(button);
  33 WT(image);
  34 WT(label);
  35 WT(vbox);
  36
  37 struct icon;
  38
  39 static void update_icon(const struct icon *icon);
  40 static void clicked_icon(GtkButton *, gpointer);
  41 static void clicked_menu(GtkMenuItem *, gpointer userdata);
  42 static void toggled_menu(GtkCheckMenuItem *, gpointer userdata);
  43
  44 static int enable_rtp(disorder_eclient *c,
  45                       disorder_eclient_no_response *completed,
  46                       void *v);
  47 static int disable_rtp(disorder_eclient *c,
  48                        disorder_eclient_no_response *completed,
  49                        void *v);
  50
  51 static double left(double v, double b);
  52 static double right(double v, double b);
  53 static double volume(double l, double r);
  54 static double balance(double l, double r);
  55
  56 static void volume_adjusted(GtkAdjustment *a, gpointer user_data);
  57 static gchar *format_volume(GtkScale *scale, gdouble value);
  58 static gchar *format_balance(GtkScale *scale, gdouble value);
  59
  60 static void volume_changed(const char *event,
  61                            void *eventdata,
  62                            void *callbackdata);
  63
  64 /* Control bar ------------------------------------------------------------- */
  65
  66 /** @brief Guard against feedback */
  67 int suppress_actions = 1;
  68
  69 /** @brief Definition of an icon
  70  *
  71  * We have two kinds of icon:
  72  * - action icons, which just do something but don't have a state as such
  73  * - toggle icons, which toggle between two states ("on" and "off").
  74  *
  75  * The scratch button is an action icon; currently all the others are toggle
  76  * icons.
  77  *
  78  * (All icons can be sensitive or insensitive, separately to the above.)
  79  */
  80 struct icon {
  81   /** @brief Filename for 'on' image */
  82   const char *icon_on;
  83
  84   /** @brief Text for 'on' tooltip */
  85   const char *tip_on;
  86
  87   /** @brief Filename for 'off' image or NULL for an action icon */
  88   const char *icon_off;
  89
  90   /** @brief Text for 'off tooltip */
  91   const char *tip_off;
  92
  93   /** @brief Associated menu item or NULL */
  94   const char *menuitem;
  95
  96   /** @brief @ref eclient.h function to call to go from off to on
  97    *
  98    * For action buttons, this should be NULL.
  99    */
 100   int (*action_go_on)(disorder_eclient *c,
 101                       disorder_eclient_no_response *completed,
 102                       void *v);
 103
 104   /** @brief @ref eclient.h function to call to go from on to off
 105    *
 106    * For action buttons, this action is used.
 107    */
 108   int (*action_go_off)(disorder_eclient *c,
 109                        disorder_eclient_no_response *completed,
 110                        void *v);
 111
 112   /** @brief Get button state
 113    * @return 1 for on, 0 for off
 114    */
 115   int (*on)(void);
 116
 117   /** @brief Get button sensitivity
 118    * @return 1 for sensitive, 0 for insensitive
 119    *
 120    * Can be NULL for always sensitive.
 121    */
 122   int (*sensitive)(void);
 123
 124   /** @brief Pointer to button */
 125   GtkWidget *button;
 126
 127   /** @brief Pointer to menu item */
 128   GtkWidget *item;
 129
 130   GtkWidget *image_on;
 131   GtkWidget *image_off;
 132 };
 133
 134 /* TODO: Add rights into the mix below */
 135
 136 static int pause_resume_on(void) {
 137   return !(last_state & DISORDER_TRACK_PAUSED);
 138 }
 139
 140 static int pause_resume_sensitive(void) {
 141   return !!(last_state & DISORDER_PLAYING)
 142     && (last_rights & RIGHT_PAUSE);
 143 }
 144
 145 static int scratch_sensitive(void) {
 146   return !!(last_state & DISORDER_PLAYING)
 147     && right_scratchable(last_rights, config->username, playing_track);
 148 }
 149
 150 static int random_sensitive(void) {
 151   return !!(last_rights & RIGHT_GLOBAL_PREFS);
 152 }
 153
 154 static int random_enabled(void) {
 155   return !!(last_state & DISORDER_RANDOM_ENABLED);
 156 }
 157
 158 static int playing_sensitive(void) {
 159   return !!(last_rights & RIGHT_GLOBAL_PREFS);
 160 }
 161
 162 static int playing_enabled(void) {
 163   return !!(last_state & DISORDER_PLAYING_ENABLED);
 164 }
 165
 166 static int rtp_enabled(void) {
 167   return rtp_is_running;
 168 }
 169
 170 static int rtp_sensitive(void) {
 171   return rtp_supported;
 172 }
 173
 174 /** @brief Table of all icons */
 175 static struct icon icons[] = {
 176   {
 177     icon_on: "pause.png",
 178     tip_on: "Pause playing track",
 179     icon_off: "play.png",
 180     tip_off: "Resume playing track",
 181     menuitem: "<GdisorderMain>/Control/Playing",
 182     on: pause_resume_on,
 183     sensitive: pause_resume_sensitive,
 184     action_go_on: disorder_eclient_resume,
 185     action_go_off: disorder_eclient_pause,
 186   },
 187   {
 188     icon_on: "cross.png",
 189     tip_on: "Cancel playing track",
 190     menuitem: "<GdisorderMain>/Control/Scratch",
 191     sensitive: scratch_sensitive,
 192     action_go_off: disorder_eclient_scratch_playing,
 193   },
 194   {
 195     icon_on: "randomcross.png",
 196     tip_on: "Disable random play",
 197     icon_off: "random.png",
 198     tip_off: "Enable random play",
 199     menuitem: "<GdisorderMain>/Control/Random play",
 200     on: random_enabled,
 201     sensitive: random_sensitive,
 202     action_go_on: disorder_eclient_random_enable,
 203     action_go_off: disorder_eclient_random_disable,
 204   },
 205   {
 206     icon_on: "notescross.png",
 207     tip_on: "Disable play",
 208     icon_off: "notes.png",
 209     tip_off: "Enable play",
 210     on: playing_enabled,
 211     sensitive: playing_sensitive,
 212     action_go_on: disorder_eclient_enable,
 213     action_go_off: disorder_eclient_disable,
 214   },
 215   {
 216     icon_on: "speakercross.png",
 217     tip_on: "Stop playing network stream",
 218     icon_off: "speaker.png",
 219     tip_off: "Play network stream",
 220     menuitem: "<GdisorderMain>/Control/Network player",
 221     on: rtp_enabled,
 222     sensitive: rtp_sensitive,
 223     action_go_on: enable_rtp,
 224     action_go_off: disable_rtp
 225   },
 226 };
 227
 228 /** @brief Count of icons */
 229 #define NICONS (int)(sizeof icons / sizeof *icons)
 230
 231 static GtkAdjustment *volume_adj;
 232 static GtkAdjustment *balance_adj;
 233 static GtkWidget *volume_widget;
 234 static GtkWidget *balance_widget;
 235
 236 /** @brief Called whenever last_state changes in any way
 237  *
 238  * TODO we should only update things that have changed.
 239  */
 240 static void control_changed(const char attribute((unused)) *event,
 241                             void attribute((unused)) *evendata,
 242                             void attribute((unused)) *callbackdata) {
 243   int n;
 244   gboolean volume_supported;
 245
 246   D(("control_changed"));
 247   /* Update all the icons */
 248   for(n = 0; n < NICONS; ++n)
 249     update_icon(&icons[n]);
 250   /* Only display volume/balance controls if they will work */
 251   if(!rtp_supported
 252      || (rtp_supported && mixer_supported(DEFAULT_BACKEND)))
 253     volume_supported = TRUE;
 254   else
 255     volume_supported = FALSE;
 256   (volume_supported ? gtk_widget_show : gtk_widget_hide)(volume_widget);
 257   (volume_supported ? gtk_widget_show : gtk_widget_hide)(balance_widget);
 258 }
 259
 260 /** @brief Create the control bar */
 261 GtkWidget *control_widget(void) {
 262   GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox;
 263   int n;
 264
 265   NW(hbox);
 266   D(("control_widget"));
 267   assert(mainmenufactory);              /* ordering must be right */
 268   for(n = 0; n < NICONS; ++n) {
 269     /* Create the button */
 270     NW(button);
 271     icons[n].button = gtk_button_new();
 272     gtk_widget_set_style(icons[n].button, tool_style);
 273     icons[n].image_on = gtk_image_new_from_pixbuf(find_image(icons[n].icon_on));
 274     gtk_widget_set_style(icons[n].image_on, tool_style);
 275     g_object_ref(icons[n].image_on);
 276     /* If it's a toggle icon, create the 'off' half too */
 277     if(icons[n].icon_off) {
 278       icons[n].image_off = gtk_image_new_from_pixbuf(find_image(icons[n].icon_off));
 279       gtk_widget_set_style(icons[n].image_off, tool_style);
 280       g_object_ref(icons[n].image_off);
 281     }
 282     g_signal_connect(G_OBJECT(icons[n].button), "clicked",
 283                      G_CALLBACK(clicked_icon), &icons[n]);
 284     /* pop the icon in a vbox so it doesn't get vertically stretch if there are
 285      * taller things in the control bar */
 286     NW(vbox);
 287     vbox = gtk_vbox_new(FALSE, 0);
 288     gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0);
 289     gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
 290     if(icons[n].menuitem) {
 291       /* Find the menu item */
 292       icons[n].item = gtk_item_factory_get_widget(mainmenufactory,
 293                                                   icons[n].menuitem);
 294       if(icons[n].icon_off)
 295         g_signal_connect(G_OBJECT(icons[n].item), "toggled",
 296                          G_CALLBACK(toggled_menu), &icons[n]);
 297       else
 298         g_signal_connect(G_OBJECT(icons[n].item), "activate",
 299                          G_CALLBACK(clicked_menu), &icons[n]);
 300     }
 301   }
 302   /* create the adjustments for the volume control */
 303   NW(adjustment);
 304   volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto,
 305                                                  goesupto / 20, goesupto / 20,
 306                                                  0));
 307   NW(adjustment);
 308   balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1,
 309                                                   0.2, 0.2, 0));
 310   /* the volume control */
 311   NW(hscale);
 312   volume_widget = gtk_hscale_new(volume_adj);
 313   NW(hscale);
 314   balance_widget = gtk_hscale_new(balance_adj);
 315   gtk_widget_set_style(volume_widget, tool_style);
 316   gtk_widget_set_style(balance_widget, tool_style);
 317   gtk_scale_set_digits(GTK_SCALE(volume_widget), 10);
 318   gtk_scale_set_digits(GTK_SCALE(balance_widget), 10);
 319   gtk_widget_set_size_request(volume_widget, 192, -1);
 320   gtk_widget_set_size_request(balance_widget, 192, -1);
 321   gtk_tooltips_set_tip(tips, volume_widget, "Volume", "");
 322   gtk_tooltips_set_tip(tips, balance_widget, "Balance", "");
 323   gtk_box_pack_start(GTK_BOX(hbox), volume_widget, FALSE, TRUE, 0);
 324   gtk_box_pack_start(GTK_BOX(hbox), balance_widget, FALSE, TRUE, 0);
 325   /* space updates rather than hammering the server */
 326   gtk_range_set_update_policy(GTK_RANGE(volume_widget), GTK_UPDATE_DELAYED);
 327   gtk_range_set_update_policy(GTK_RANGE(balance_widget), GTK_UPDATE_DELAYED);
 328   /* notice when the adjustments are changed */
 329   g_signal_connect(G_OBJECT(volume_adj), "value-changed",
 330                    G_CALLBACK(volume_adjusted), 0);
 331   g_signal_connect(G_OBJECT(balance_adj), "value-changed",
 332                    G_CALLBACK(volume_adjusted), 0);
 333   /* format the volume/balance values ourselves */
 334   g_signal_connect(G_OBJECT(volume_widget), "format-value",
 335                    G_CALLBACK(format_volume), 0);
 336   g_signal_connect(G_OBJECT(balance_widget), "format-value",
 337                    G_CALLBACK(format_balance), 0);
 338   event_register("enabled-changed", control_changed, 0);
 339   event_register("random-changed", control_changed, 0);
 340   event_register("pause-changed", control_changed, 0);
 341   event_register("playing-changed", control_changed, 0);
 342   event_register("rtp-changed", control_changed, 0);
 343   event_register("rights-changed", control_changed, 0);
 344   event_register("volume-changed", volume_changed, 0);
 345   return hbox;
 346 }
 347
 348 /** @brief Update the volume control when it changes */
 349 static void volume_changed(const char attribute((unused)) *event,
 350                            void attribute((unused)) *eventdata,
 351                            void attribute((unused)) *callbackdata) {
 352   double l, r;
 353
 354   D(("volume_changed"));
 355   l = volume_l / 100.0;
 356   r = volume_r / 100.0;
 357   ++suppress_actions;
 358   gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto);
 359   gtk_adjustment_set_value(balance_adj, balance(l, r));
 360   --suppress_actions;
 361 }
 362
 363 /** @brief Update the state of one of the control icons
 364  * @param icon Target icon
 365  */
 366 static void update_icon(const struct icon *icon) {
 367   int on = icon->on ? icon->on() : 1;
 368   int sensitive = icon->sensitive ? icon->sensitive() : 1;
 369   GtkWidget *child, *newchild;
 370
 371   ++suppress_actions;
 372   /* If the connection is down nothing is ever usable */
 373   if(!(last_state & DISORDER_CONNECTED))
 374     sensitive = 0;
 375   /* Replace the child */
 376   newchild = on ? icon->image_on : icon->image_off;
 377   child = gtk_bin_get_child(GTK_BIN(icon->button));
 378   if(child != newchild) {
 379     if(child)
 380       gtk_container_remove(GTK_CONTAINER(icon->button), child);
 381     gtk_container_add(GTK_CONTAINER(icon->button), newchild);
 382     gtk_widget_show(newchild);
 383   }
 384   if(icon->tip_on)
 385     gtk_tooltips_set_tip(tips, icon->button,
 386                            on ? icon->tip_on : icon->tip_off, "");
 387   gtk_widget_set_sensitive(icon->button, sensitive);
 388   /* Icons with an associated menu item */
 389   if(icon->item) {
 390     if(icon->icon_off)
 391       gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), on);
 392     gtk_widget_set_sensitive(icon->item, sensitive);
 393   }
 394   --suppress_actions;
 395 }
 396
 397 static void icon_action_completed(void attribute((unused)) *v,
 398                                   const char *error) {
 399   if(error)
 400     popup_protocol_error(0, error);
 401 }
 402
 403 static void clicked_icon(GtkButton attribute((unused)) *button,
 404                          gpointer userdata) {
 405   const struct icon *icon = userdata;
 406
 407   if(suppress_actions)
 408     return;
 409   if(!icon->on || icon->on())
 410     icon->action_go_off(client, icon_action_completed, 0);
 411   else
 412     icon->action_go_on(client, icon_action_completed, 0);
 413 }
 414
 415 static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem,
 416                          gpointer userdata) {
 417   clicked_icon(NULL, userdata);
 418 }
 419
 420 static void toggled_menu(GtkCheckMenuItem attribute((unused)) *menuitem,
 421                          gpointer userdata) {
 422   clicked_icon(NULL, userdata);
 423 }
 424
 425 /** @brief Called when a volume command completes */
 426 static void volume_completed(void attribute((unused)) *v,
 427                              const char *error,
 428                              int attribute((unused)) l,
 429                              int attribute((unused)) r) {
 430   if(error)
 431     popup_protocol_error(0, error);
 432   /* We don't set the UI's notion of the volume here, it is set from the log
 433    * regardless of the reason it changed */
 434 }
 435
 436 /** @brief Called when the volume has been adjusted */
 437 static void volume_adjusted(GtkAdjustment attribute((unused)) *a,
 438                             gpointer attribute((unused)) user_data) {
 439   double v = gtk_adjustment_get_value(volume_adj) / goesupto;
 440   double b = gtk_adjustment_get_value(balance_adj);
 441
 442   if(suppress_actions)
 443     /* This is the result of an update from the server, not a change from the
 444      * user.  Don't feedback! */
 445     return;
 446   D(("volume_adjusted"));
 447   /* force to 'stereotypical' values */
 448   v = nearbyint(100 * v) / 100;
 449   b = nearbyint(5 * b) / 5;
 450   /* Set the volume.  We don't want a reply, we'll get the actual new volume
 451    * from the log. */
 452   if(rtp_supported) {
 453     int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100);
 454     mixer_control(DEFAULT_BACKEND, &l, &r, 1);
 455   } else
 456     disorder_eclient_volume(client, volume_completed,
 457                             nearbyint(left(v, b) * 100),
 458                             nearbyint(right(v, b) * 100),
 459                             0);
 460 }
 461
 462 /** @brief Formats the volume value */
 463 static gchar *format_volume(GtkScale attribute((unused)) *scale,
 464                             gdouble value) {
 465   char s[32];
 466
 467   snprintf(s, sizeof s, "%.1f", (double)value);
 468   return g_strdup(s);
 469 }
 470
 471 /** @brief Formats the balance value */
 472 static gchar *format_balance(GtkScale attribute((unused)) *scale,
 473                              gdouble value) {
 474   char s[32];
 475
 476   if(fabs(value) < 0.1)
 477     return g_strdup("0");
 478   snprintf(s, sizeof s, "%+.1f", (double)value);
 479   return g_strdup(s);
 480 }
 481
 482 /* Volume mapping.  We consider left, right, volume to be in [0,1]
 483  * and balance to be in [-1,1].
 484  *
 485  * First, we just have volume = max(left, right).
 486  *
 487  * Balance we consider to linearly represent the amount by which the quieter
 488  * channel differs from the louder.  In detail:
 489  *
 490  *  if right > left then balance > 0:
 491  *   balance = 0 => left = right  (as an endpoint, not an instance)
 492  *   balance = 1 => left = 0
 493  *   fitting to linear, left = right * (1 - balance)
 494  *                so balance = 1 - left / right
 495  *   (right > left => right > 0 so no division by 0.)
 496  *
 497  *  if left > right then balance < 0:
 498  *   balance = 0 => right = left  (same caveat as above)
 499  *   balance = -1 => right = 0
 500  *   again fitting to linear, right = left * (1 + balance)
 501  *                       so balance = right / left - 1
 502  *   (left > right => left > 0 so no division by 0.)
 503  *
 504  *  if left = right then we just have balance = 0.
 505  *
 506  * Thanks to Clive and Andrew.
 507  */
 508
 509 /** @brief Return the greater of @p x and @p y */
 510 static double max(double x, double y) {
 511   return x > y ? x : y;
 512 }
 513
 514 /** @brief Compute the left channel volume */
 515 static double left(double v, double b) {
 516   if(b > 0)                             /* volume = right */
 517     return v * (1 - b);
 518   else                                  /* volume = left */
 519     return v;
 520 }
 521
 522 /** @brief Compute the right channel volume */
 523 static double right(double v, double b) {
 524   if(b > 0)                             /* volume = right */
 525     return v;
 526   else                                  /* volume = left */
 527     return v * (1 + b);
 528 }
 529
 530 /** @brief Compute the overall volume */
 531 static double volume(double l, double r) {
 532   return max(l, r);
 533 }
 534
 535 /** @brief Compute the balance */
 536 static double balance(double l, double r) {
 537   if(l > r)
 538     return r / l - 1;
 539   else if(r > l)
 540     return 1 - l / r;
 541   else                                  /* left = right */
 542     return 0;
 543 }
 544
 545 /** @brief Called to enable RTP play
 546  *
 547  * Rather odd signature is to fit in with the other icons which all call @ref
 548  * lib/eclient.h functions.
 549  */
 550 static int enable_rtp(disorder_eclient attribute((unused)) *c,
 551                       disorder_eclient_no_response attribute((unused)) *completed,
 552                       void attribute((unused)) *v) {
 553   start_rtp();
 554   return 0;
 555 }
 556
 557 /** @brief Called to disable RTP play
 558  *
 559  * Rather odd signature is to fit in with the other icons which all call @ref
 560  * lib/eclient.h functions.
 561  */
 562 static int disable_rtp(disorder_eclient attribute((unused)) *c,
 563                        disorder_eclient_no_response attribute((unused)) *completed,
 564                        void attribute((unused)) *v) {
 565   stop_rtp();
 566   return 0;
 567 }
 568
 569 /*
 570 Local Variables:
 571 c-basic-offset:2
 572 comment-column:40
 573 fill-column:79
 574 indent-tabs-mode:nil
 575 End:
 576 */