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