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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2006, 2007 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
  26 /* Forward declarations ---------------------------------------------------- */
  27
  28 WT(adjustment);
  29 WT(hscale);
  30 WT(hbox);
  31 WT(tooltips);
  32 WT(button);
  33 WT(image);
  34 WT(label);
  35 WT(vbox);
  36
  37 struct icon;
  38
  39 static void update_pause(const struct icon *);
  40 static void update_play(const struct icon *);
  41 static void update_scratch(const struct icon *);
  42 static void update_random_enable(const struct icon *);
  43 static void update_random_disable(const struct icon *);
  44 static void update_enable(const struct icon *);
  45 static void update_disable(const struct icon *);
  46 static void clicked_icon(GtkButton *, gpointer);
  47
  48 static double left(double v, double b);
  49 static double right(double v, double b);
  50 static double volume(double l, double r);
  51 static double balance(double l, double r);
  52
  53 static void volume_adjusted(GtkAdjustment *a, gpointer user_data);
  54 static gchar *format_volume(GtkScale *scale, gdouble value);
  55 static gchar *format_balance(GtkScale *scale, gdouble value);
  56
  57 /* Control bar ------------------------------------------------------------- */
  58
  59 /** @brief Guard against feedback loop in volume control */
  60 static int suppress_set_volume;
  61
  62 /** @brief Definition of an icon
  63  *
  64  * The design here is rather mad: rather than changing the image displayed by
  65  * icons according to their state, we flip the visibility of pairs of icons.
  66  */
  67 struct icon {
  68   /** @brief Filename for image */
  69   const char *icon;
  70
  71   /** @brief Text for tooltip */
  72   const char *tip;
  73
  74   /** @brief Called when button is clicked (activated) */
  75   void (*clicked)(GtkButton *button, gpointer userdata);
  76
  77   /** @brief Called to update button when state may have changed */
  78   void (*update)(const struct icon *i);
  79
  80   /** @brief @ref eclient.h function to call */
  81   int (*action)(disorder_eclient *c,
  82                 disorder_eclient_no_response *completed,
  83                 void *v);
  84
  85   /** @brief Pointer to button */
  86   GtkWidget *button;
  87 };
  88
  89 /** @brief Table of all icons */
  90 static struct icon icons[] = {
  91   { "pause.png", "Pause playing track", clicked_icon, update_pause,
  92     disorder_eclient_pause, 0 },
  93   { "play.png", "Resume playing track", clicked_icon, update_play,
  94     disorder_eclient_resume, 0 },
  95   { "cross.png", "Cancel playing track", clicked_icon, update_scratch,
  96     disorder_eclient_scratch_playing, 0 },
  97   { "random.png", "Enable random play", clicked_icon, update_random_enable,
  98     disorder_eclient_random_enable, 0 },
  99   { "randomcross.png", "Disable random play", clicked_icon, update_random_disable,
 100     disorder_eclient_random_disable, 0 },
 101   { "notes.png", "Enable play", clicked_icon, update_enable,
 102     disorder_eclient_enable, 0 },
 103   { "notescross.png", "Disable play", clicked_icon, update_disable,
 104     disorder_eclient_disable, 0 },
 105 };
 106
 107 /** @brief Count of icons */
 108 #define NICONS (int)(sizeof icons / sizeof *icons)
 109
 110 static GtkAdjustment *volume_adj;
 111 static GtkAdjustment *balance_adj;
 112
 113 /** @brief Called whenever last_state changes in any way */
 114 static void control_monitor(void attribute((unused)) *u) {
 115   int n;
 116
 117   D(("control_monitor"));
 118   for(n = 0; n < NICONS; ++n)
 119     icons[n].update(&icons[n]);
 120 }
 121
 122 /** @brief Create the control bar */
 123 GtkWidget *control_widget(void) {
 124   GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox;
 125   GtkWidget *content;
 126   GdkPixbuf *pb;
 127   GtkWidget *v, *b;
 128   GtkTooltips *tips = gtk_tooltips_new();
 129   int n;
 130
 131   NW(hbox);
 132   NW(tooltips);
 133   D(("control_widget"));
 134   for(n = 0; n < NICONS; ++n) {
 135     NW(button);
 136     icons[n].button = gtk_button_new();
 137     if((pb = find_image(icons[n].icon))) {
 138       NW(image);
 139       content = gtk_image_new_from_pixbuf(pb);
 140     } else {
 141       NW(label);
 142       content = gtk_label_new(icons[n].icon);
 143     }
 144     gtk_container_add(GTK_CONTAINER(icons[n].button), content);
 145     gtk_tooltips_set_tip(tips, icons[n].button, icons[n].tip, "");
 146     g_signal_connect(G_OBJECT(icons[n].button), "clicked",
 147                      G_CALLBACK(icons[n].clicked), &icons[n]);
 148     /* pop the icon in a vbox so it doesn't get vertically stretch if there are
 149      * taller things in the control bar */
 150     NW(vbox);
 151     vbox = gtk_vbox_new(FALSE, 0);
 152     gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0);
 153     gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
 154   }
 155   /* create the adjustments for the volume control */
 156   NW(adjustment);
 157   volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto,
 158                                                  goesupto / 20, goesupto / 20,
 159                                                  0));
 160   NW(adjustment);
 161   balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1,
 162                                                   0.2, 0.2, 0));
 163   /* the volume control */
 164   NW(hscale);
 165   v = gtk_hscale_new(volume_adj);
 166   NW(hscale);
 167   b = gtk_hscale_new(balance_adj);
 168   gtk_scale_set_digits(GTK_SCALE(v), 10);
 169   gtk_scale_set_digits(GTK_SCALE(b), 10);
 170   gtk_widget_set_size_request(v, 192, -1);
 171   gtk_widget_set_size_request(b, 192, -1);
 172   gtk_tooltips_set_tip(tips, v, "Volume", "");
 173   gtk_tooltips_set_tip(tips, b, "Balance", "");
 174   gtk_box_pack_start(GTK_BOX(hbox), v, FALSE, TRUE, 0);
 175   gtk_box_pack_start(GTK_BOX(hbox), b, FALSE, TRUE, 0);
 176   /* space updates rather than hammering the server */
 177   gtk_range_set_update_policy(GTK_RANGE(v), GTK_UPDATE_DELAYED);
 178   gtk_range_set_update_policy(GTK_RANGE(b), GTK_UPDATE_DELAYED);
 179   /* notice when the adjustments are changed */
 180   g_signal_connect(G_OBJECT(volume_adj), "value-changed",
 181                    G_CALLBACK(volume_adjusted), 0);
 182   g_signal_connect(G_OBJECT(balance_adj), "value-changed",
 183                    G_CALLBACK(volume_adjusted), 0);
 184   /* format the volume/balance values ourselves */
 185   g_signal_connect(G_OBJECT(v), "format-value",
 186                    G_CALLBACK(format_volume), 0);
 187   g_signal_connect(G_OBJECT(b), "format-value",
 188                    G_CALLBACK(format_balance), 0);
 189   register_monitor(control_monitor, 0, -1UL);
 190   return hbox;
 191 }
 192
 193 /** @brief Update the volume control when it changes */
 194 void volume_update(void) {
 195   double l, r;
 196
 197   D(("volume_update"));
 198   l = volume_l / 100.0;
 199   r = volume_r / 100.0;
 200   ++suppress_set_volume;
 201   gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto);
 202   gtk_adjustment_set_value(balance_adj, balance(l, r));
 203   --suppress_set_volume;
 204 }
 205
 206 /** @brief Update the state of one of the control icons
 207  * @param icon Target icon
 208  * @param visible True if this version of the button should be visible
 209  * @param usable True if the button is currently usable
 210  *
 211  * Several of the icons, rather bizarrely, come in pairs: for instance exactly
 212  * one of the play and pause buttons is supposed to be visible at any given
 213  * moment.
 214  *
 215  * @p usable need not take into account server availability, that is done
 216  * automatically.
 217  */
 218 static void update_icon(const struct icon *icon,
 219                         int visible, int usable) {
 220   /* If the connection is down nothing is ever usable */
 221   if(!(last_state & DISORDER_CONNECTED))
 222     usable = 0;
 223   (visible ? gtk_widget_show : gtk_widget_hide)(icon->button);
 224   /* Only both updating usability if the button is visible */
 225   if(visible)
 226     gtk_widget_set_sensitive(icon->button, usable);
 227 }
 228
 229 static void update_pause(const struct icon *icon) {
 230   const int visible = !(last_state & DISORDER_TRACK_PAUSED);
 231   const int usable = !!(last_state & DISORDER_PLAYING); /* TODO: might be a lie */
 232   update_icon(icon, visible, usable);
 233 }
 234
 235 static void update_play(const struct icon *icon) {
 236   const int visible = !!(last_state & DISORDER_TRACK_PAUSED);
 237   const int usable = !!(last_state & DISORDER_PLAYING);
 238   update_icon(icon, visible, usable);
 239 }
 240
 241 static void update_scratch(const struct icon *icon) {
 242   const int visible = 1;
 243   const int usable = !!(last_state & DISORDER_PLAYING);
 244   update_icon(icon, visible, usable);
 245 }
 246
 247 static void update_random_enable(const struct icon *icon) {
 248   const int visible = !(last_state & DISORDER_RANDOM_ENABLED);
 249   const int usable = 1;
 250   update_icon(icon, visible, usable);
 251 }
 252
 253 static void update_random_disable(const struct icon *icon) {
 254   const int visible = !!(last_state & DISORDER_RANDOM_ENABLED);
 255   const int usable = 1;
 256   update_icon(icon, visible, usable);
 257 }
 258
 259 static void update_enable(const struct icon *icon) {
 260   const int visible = !(last_state & DISORDER_PLAYING_ENABLED);
 261   const int usable = 1;
 262   update_icon(icon, visible, usable);
 263 }
 264
 265 static void update_disable(const struct icon *icon) {
 266   const int visible = !!(last_state & DISORDER_PLAYING_ENABLED);
 267   const int usable = 1;
 268   update_icon(icon, visible, usable);
 269 }
 270
 271 static void clicked_icon(GtkButton attribute((unused)) *button,
 272                          gpointer userdata) {
 273   const struct icon *icon = userdata;
 274
 275   icon->action(client, 0, 0);
 276 }
 277
 278 /** @brief Called when the volume has been adjusted */
 279 static void volume_adjusted(GtkAdjustment attribute((unused)) *a,
 280                             gpointer attribute((unused)) user_data) {
 281   double v = gtk_adjustment_get_value(volume_adj) / goesupto;
 282   double b = gtk_adjustment_get_value(balance_adj);
 283
 284   if(suppress_set_volume)
 285     /* This is the result of an update from the server, not a change from the
 286      * user.  Don't feedback! */
 287     return;
 288   D(("volume_adjusted"));
 289   /* force to 'stereotypical' values */
 290   v = nearbyint(100 * v) / 100;
 291   b = nearbyint(5 * b) / 5;
 292   /* Set the volume.  We don't want a reply, we'll get the actual new volume
 293    * from the log. */
 294   disorder_eclient_volume(client, 0,
 295                           nearbyint(left(v, b) * 100),
 296                           nearbyint(right(v, b) * 100),
 297                           0);
 298 }
 299
 300 /** @brief Formats the volume value */
 301 static gchar *format_volume(GtkScale attribute((unused)) *scale,
 302                             gdouble value) {
 303   char s[32];
 304
 305   snprintf(s, sizeof s, "%.1f", (double)value);
 306   return g_strdup(s);
 307 }
 308
 309 /** @brief Formats the balance value */
 310 static gchar *format_balance(GtkScale attribute((unused)) *scale,
 311                              gdouble value) {
 312   char s[32];
 313
 314   if(fabs(value) < 0.1)
 315     return g_strdup("0");
 316   snprintf(s, sizeof s, "%+.1f", (double)value);
 317   return g_strdup(s);
 318 }
 319
 320 /* Volume mapping.  We consider left, right, volume to be in [0,1]
 321  * and balance to be in [-1,1].
 322  *
 323  * First, we just have volume = max(left, right).
 324  *
 325  * Balance we consider to linearly represent the amount by which the quieter
 326  * channel differs from the louder.  In detail:
 327  *
 328  *  if right > left then balance > 0:
 329  *   balance = 0 => left = right  (as an endpoint, not an instance)
 330  *   balance = 1 => left = 0
 331  *   fitting to linear, left = right * (1 - balance)
 332  *                so balance = 1 - left / right
 333  *   (right > left => right > 0 so no division by 0.)
 334  *
 335  *  if left > right then balance < 0:
 336  *   balance = 0 => right = left  (same caveat as above)
 337  *   balance = -1 => right = 0
 338  *   again fitting to linear, right = left * (1 + balance)
 339  *                       so balance = right / left - 1
 340  *   (left > right => left > 0 so no division by 0.)
 341  *
 342  *  if left = right then we just have balance = 0.
 343  *
 344  * Thanks to Clive and Andrew.
 345  */
 346
 347 /** @brief Return the greater of @p x and @p y */
 348 static double max(double x, double y) {
 349   return x > y ? x : y;
 350 }
 351
 352 /** @brief Compute the left channel volume */
 353 static double left(double v, double b) {
 354   if(b > 0)                             /* volume = right */
 355     return v * (1 - b);
 356   else                                  /* volume = left */
 357     return v;
 358 }
 359
 360 /** @brief Compute the right channel volume */
 361 static double right(double v, double b) {
 362   if(b > 0)                             /* volume = right */
 363     return v;
 364   else                                  /* volume = left */
 365     return v * (1 + b);
 366 }
 367
 368 /** @brief Compute the overall volume */
 369 static double volume(double l, double r) {
 370   return max(l, r);
 371 }
 372
 373 /** @brief Compute the balance */
 374 static double balance(double l, double r) {
 375   if(l > r)
 376     return r / l - 1;
 377   else if(r > l)
 378     return 1 - l / r;
 379   else                                  /* left = right */
 380     return 0;
 381 }
 382
 383 /*
 384 Local Variables:
 385 c-basic-offset:2
 386 comment-column:40
 387 fill-column:79
 388 indent-tabs-mode:nil
 389 End:
 390 */