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
  21 #include "disobedience.h"
  22
  23 /* Forward declarations ---------------------------------------------------- */
  24
  25 WT(adjustment);
  26 WT(hscale);
  27 WT(hbox);
  28 WT(tooltips);
  29 WT(button);
  30 WT(image);
  31 WT(label);
  32 WT(vbox);
  33
  34 struct icon;
  35
  36 static void update_pause(const struct icon *);
  37 static void update_play(const struct icon *);
  38 static void update_scratch(const struct icon *);
  39 static void update_random_enable(const struct icon *);
  40 static void update_random_disable(const struct icon *);
  41 static void update_enable(const struct icon *);
  42 static void update_disable(const struct icon *);
  43 static void clicked_icon(GtkButton *, gpointer);
  44
  45 static double left(double v, double b);
  46 static double right(double v, double b);
  47 static double volume(double l, double r);
  48 static double balance(double l, double r);
  49
  50 static void volume_adjusted(GtkAdjustment *a, gpointer user_data);
  51 static gchar *format_volume(GtkScale *scale, gdouble value);
  52 static gchar *format_balance(GtkScale *scale, gdouble value);
  53
  54 static void control_monitor(void *u);
  55
  56 /* Control bar ------------------------------------------------------------- */
  57
  58 static int suppress_set_volume;
  59 /* Guard against feedback loop in volume control */
  60
  61 static struct icon {
  62   const char *icon;
  63   const char *tip;
  64   void (*clicked)(GtkButton *button, gpointer userdata);
  65   void (*update)(const struct icon *i);
  66   int (*action)(disorder_eclient *c,
  67                 disorder_eclient_no_response *completed,
  68                 void *v);
  69   GtkWidget *button;
  70 } icons[] = {
  71   { "pause.png", "Pause playing track", clicked_icon, update_pause,
  72     disorder_eclient_pause, 0 },
  73   { "play.png", "Resume playing track", clicked_icon, update_play,
  74     disorder_eclient_resume, 0 },
  75   { "cross.png", "Cancel playing track", clicked_icon, update_scratch,
  76     disorder_eclient_scratch_playing, 0 },
  77   { "random.png", "Enable random play", clicked_icon, update_random_enable,
  78     disorder_eclient_random_enable, 0 },
  79   { "randomcross.png", "Disable random play", clicked_icon, update_random_disable,
  80     disorder_eclient_random_disable, 0 },
  81   { "notes.png", "Enable play", clicked_icon, update_enable,
  82     disorder_eclient_enable, 0 },
  83   { "notescross.png", "Disable play", clicked_icon, update_disable,
  84     disorder_eclient_disable, 0 },
  85 };
  86 #define NICONS (int)(sizeof icons / sizeof *icons)
  87
  88 GtkAdjustment *volume_adj, *balance_adj;
  89
  90 /* Create the control bar */
  91 GtkWidget *control_widget(void) {
  92   GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox;
  93   GtkWidget *content;
  94   GdkPixbuf *pb;
  95   GtkWidget *v, *b;
  96   GtkTooltips *tips = gtk_tooltips_new();
  97   int n;
  98
  99   NW(hbox);
 100   NW(tooltips);
 101   D(("control_widget"));
 102   for(n = 0; n < NICONS; ++n) {
 103     NW(button);
 104     icons[n].button = gtk_button_new();
 105     if((pb = find_image(icons[n].icon))) {
 106       NW(image);
 107       content = gtk_image_new_from_pixbuf(pb);
 108     } else {
 109       NW(label);
 110       content = gtk_label_new(icons[n].icon);
 111     }
 112     gtk_container_add(GTK_CONTAINER(icons[n].button), content);
 113     gtk_tooltips_set_tip(tips, icons[n].button, icons[n].tip, "");
 114     g_signal_connect(G_OBJECT(icons[n].button), "clicked",
 115                      G_CALLBACK(icons[n].clicked), &icons[n]);
 116     /* pop the icon in a vbox so it doesn't get vertically stretch if there are
 117      * taller things in the control bar */
 118     NW(vbox);
 119     vbox = gtk_vbox_new(FALSE, 0);
 120     gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0);
 121     gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
 122   }
 123   /* create the adjustments for the volume control */
 124   NW(adjustment);
 125   volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto,
 126                                                  goesupto / 20, goesupto / 20,
 127                                                  0));
 128   NW(adjustment);
 129   balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1,
 130                                                   0.2, 0.2, 0));
 131   /* the volume control */
 132   NW(hscale);
 133   v = gtk_hscale_new(volume_adj);
 134   NW(hscale);
 135   b = gtk_hscale_new(balance_adj);
 136   gtk_scale_set_digits(GTK_SCALE(v), 10);
 137   gtk_scale_set_digits(GTK_SCALE(b), 10);
 138   gtk_widget_set_size_request(v, 192, -1);
 139   gtk_widget_set_size_request(b, 192, -1);
 140   gtk_tooltips_set_tip(tips, v, "Volume", "");
 141   gtk_tooltips_set_tip(tips, b, "Balance", "");
 142   gtk_box_pack_start(GTK_BOX(hbox), v, FALSE, TRUE, 0);
 143   gtk_box_pack_start(GTK_BOX(hbox), b, FALSE, TRUE, 0);
 144   /* space updates rather than hammering the server */
 145   gtk_range_set_update_policy(GTK_RANGE(v), GTK_UPDATE_DELAYED);
 146   gtk_range_set_update_policy(GTK_RANGE(b), GTK_UPDATE_DELAYED);
 147   /* notice when the adjustments are changed */
 148   g_signal_connect(G_OBJECT(volume_adj), "value-changed",
 149                    G_CALLBACK(volume_adjusted), 0);
 150   g_signal_connect(G_OBJECT(balance_adj), "value-changed",
 151                    G_CALLBACK(volume_adjusted), 0);
 152   /* format the volume/balance values ourselves */
 153   g_signal_connect(G_OBJECT(v), "format-value",
 154                    G_CALLBACK(format_volume), 0);
 155   g_signal_connect(G_OBJECT(b), "format-value",
 156                    G_CALLBACK(format_balance), 0);
 157   register_monitor(control_monitor, 0, -1UL);
 158   return hbox;
 159 }
 160
 161 /** @brief Update the control bar after some kind of state change */
 162 void control_update(void) {
 163   double l, r;
 164
 165   D(("control_update"));
 166   /*control_monitor(0, disorder_eclient_state(client));*/
 167   l = volume_l / 100.0;
 168   r = volume_r / 100.0;
 169   ++suppress_set_volume;
 170   gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto);
 171   gtk_adjustment_set_value(balance_adj, balance(l, r));
 172   --suppress_set_volume;
 173 }
 174
 175 static void control_monitor(void attribute((unused)) *u) {
 176   int n;
 177
 178   for(n = 0; n < NICONS; ++n)
 179     icons[n].update(&icons[n]);
 180 }
 181
 182 /** @brief Update the state of one of the control icons
 183  * @param icon Target icon
 184  * @param visible True if this version of the button should be visible
 185  * @param usable True if the button is currently usable
 186  *
 187  * Several of the icons, rather bizarrely, come in pairs: for instance exactly
 188  * one of the play and pause buttons is supposed to be visible at any given
 189  * moment.
 190  *
 191  * @p usable need not take into account server availability, that is done
 192  * automatically.
 193  */
 194 static void update_icon(const struct icon *icon,
 195                         int visible, int usable) {
 196   /* If the connection is down nothing is ever usable */
 197   if(!(last_state & DISORDER_CONNECTED))
 198     usable = 0;
 199   (visible ? gtk_widget_show : gtk_widget_hide)(icon->button);
 200   /* Only both updating usability if the button is visible */
 201   if(visible)
 202     gtk_widget_set_sensitive(icon->button, usable);
 203 }
 204
 205 static void update_pause(const struct icon *icon) {
 206   const int visible = !(last_state & DISORDER_TRACK_PAUSED);
 207   const int usable = !!(last_state & DISORDER_PLAYING); /* TODO: might be a lie */
 208   update_icon(icon, visible, usable);
 209 }
 210
 211 static void update_play(const struct icon *icon) {
 212   const int visible = !!(last_state & DISORDER_TRACK_PAUSED);
 213   const int usable = !!(last_state & DISORDER_PLAYING);
 214   update_icon(icon, visible, usable);
 215 }
 216
 217 static void update_scratch(const struct icon *icon) {
 218   const int visible = 1;
 219   const int usable = !!(last_state & DISORDER_PLAYING);
 220   update_icon(icon, visible, usable);
 221 }
 222
 223 static void update_random_enable(const struct icon *icon) {
 224   const int visible = !(last_state & DISORDER_RANDOM_ENABLED);
 225   const int usable = 1;
 226   update_icon(icon, visible, usable);
 227 }
 228
 229 static void update_random_disable(const struct icon *icon) {
 230   const int visible = !!(last_state & DISORDER_RANDOM_ENABLED);
 231   const int usable = 1;
 232   update_icon(icon, visible, usable);
 233 }
 234
 235 static void update_enable(const struct icon *icon) {
 236   const int visible = !(last_state & DISORDER_PLAYING_ENABLED);
 237   const int usable = 1;
 238   update_icon(icon, visible, usable);
 239 }
 240
 241 static void update_disable(const struct icon *icon) {
 242   const int visible = !!(last_state & DISORDER_PLAYING_ENABLED);
 243   const int usable = 1;
 244   update_icon(icon, visible, usable);
 245 }
 246
 247 static void clicked_icon(GtkButton attribute((unused)) *button,
 248                          gpointer userdata) {
 249   const struct icon *icon = userdata;
 250
 251   icon->action(client, 0, 0);
 252 }
 253
 254 static void volume_adjusted(GtkAdjustment attribute((unused)) *a,
 255                             gpointer attribute((unused)) user_data) {
 256   double v = gtk_adjustment_get_value(volume_adj) / goesupto;
 257   double b = gtk_adjustment_get_value(balance_adj);
 258
 259   if(suppress_set_volume)
 260     /* This is the result of an update from the server, not a change from the
 261      * user.  Don't feedback! */
 262     return;
 263   D(("volume_adjusted"));
 264   /* force to 'stereotypical' values */
 265   v = nearbyint(100 * v) / 100;
 266   b = nearbyint(5 * b) / 5;
 267   /* Set the volume.  We don't want a reply, we'll get the actual new volume
 268    * from the log. */
 269   disorder_eclient_volume(client, 0,
 270                           nearbyint(left(v, b) * 100),
 271                           nearbyint(right(v, b) * 100),
 272                           0);
 273 }
 274
 275 /* Called to format the volume value */
 276 static gchar *format_volume(GtkScale attribute((unused)) *scale,
 277                             gdouble value) {
 278   char s[32];
 279
 280   snprintf(s, sizeof s, "%.1f", (double)value);
 281   return g_strdup(s);
 282 }
 283
 284 /* Called to format the balance value. */
 285 static gchar *format_balance(GtkScale attribute((unused)) *scale,
 286                              gdouble value) {
 287   char s[32];
 288
 289   if(fabs(value) < 0.1)
 290     return g_strdup("0");
 291   snprintf(s, sizeof s, "%+.1f", (double)value);
 292   return g_strdup(s);
 293 }
 294
 295 /* Volume mapping.  We consider left, right, volume to be in [0,1]
 296  * and balance to be in [-1,1].
 297  *
 298  * First, we just have volume = max(left, right).
 299  *
 300  * Balance we consider to linearly represent the amount by which the quieter
 301  * channel differs from the louder.  In detail:
 302  *
 303  *  if right > left then balance > 0:
 304  *   balance = 0 => left = right  (as an endpoint, not an instance)
 305  *   balance = 1 => left = 0
 306  *   fitting to linear, left = right * (1 - balance)
 307  *                so balance = 1 - left / right
 308  *   (right > left => right > 0 so no division by 0.)
 309  *
 310  *  if left > right then balance < 0:
 311  *   balance = 0 => right = left  (same caveat as above)
 312  *   balance = -1 => right = 0
 313  *   again fitting to linear, right = left * (1 + balance)
 314  *                       so balance = right / left - 1
 315  *   (left > right => left > 0 so no division by 0.)
 316  *
 317  *  if left = right then we just have balance = 0.
 318  *
 319  * Thanks to Clive and Andrew.
 320  */
 321
 322 static double max(double x, double y) {
 323   return x > y ? x : y;
 324 }
 325
 326 static double left(double v, double b) {
 327   if(b > 0)                             /* volume = right */
 328     return v * (1 - b);
 329   else                                  /* volume = left */
 330     return v;
 331 }
 332
 333 static double right(double v, double b) {
 334   if(b > 0)                             /* volume = right */
 335     return v;
 336   else                                  /* volume = left */
 337     return v * (1 + b);
 338 }
 339
 340 static double volume(double l, double r) {
 341   return max(l, r);
 342 }
 343
 344 static double balance(double l, double r) {
 345   if(l > r)
 346     return r / l - 1;
 347   else if(r > l)
 348     return 1 - l / r;
 349   else                                  /* left = right */
 350     return 0;
 351 }
 352
 353 /*
 354 Local Variables:
 355 c-basic-offset:2
 356 comment-column:40
 357 fill-column:79
 358 indent-tabs-mode:nil
 359 End:
 360 */