| 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 | struct icon; |
| 30 | |
| 31 | static void clicked_icon(GtkButton *, gpointer); |
| 32 | static void clicked_menu(GtkMenuItem *, gpointer userdata); |
| 33 | static void toggled_menu(GtkCheckMenuItem *, gpointer userdata); |
| 34 | |
| 35 | static int enable_rtp(disorder_eclient *c, |
| 36 | disorder_eclient_no_response *completed, |
| 37 | void *v); |
| 38 | static int disable_rtp(disorder_eclient *c, |
| 39 | disorder_eclient_no_response *completed, |
| 40 | void *v); |
| 41 | |
| 42 | static double left(double v, double b); |
| 43 | static double right(double v, double b); |
| 44 | static double volume(double l, double r); |
| 45 | static double balance(double l, double r); |
| 46 | |
| 47 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); |
| 48 | static gchar *format_volume(GtkScale *scale, gdouble value); |
| 49 | static gchar *format_balance(GtkScale *scale, gdouble value); |
| 50 | |
| 51 | static void icon_changed(const char *event, |
| 52 | void *evendata, |
| 53 | void *callbackdata); |
| 54 | static void volume_changed(const char *event, |
| 55 | void *eventdata, |
| 56 | void *callbackdata); |
| 57 | |
| 58 | /* Control bar ------------------------------------------------------------- */ |
| 59 | |
| 60 | /** @brief Guard against feedback */ |
| 61 | int suppress_actions = 1; |
| 62 | |
| 63 | /** @brief Definition of an icon |
| 64 | * |
| 65 | * We have two kinds of icon: |
| 66 | * - action icons, which just do something but don't have a state as such |
| 67 | * - toggle icons, which toggle between two states ("on" and "off"). |
| 68 | * |
| 69 | * The scratch button is an action icon; currently all the others are toggle |
| 70 | * icons. |
| 71 | * |
| 72 | * (All icons can be sensitive or insensitive, separately to the above.) |
| 73 | */ |
| 74 | struct icon { |
| 75 | /** @brief Filename for 'on' image */ |
| 76 | const char *icon_on; |
| 77 | |
| 78 | /** @brief Text for 'on' tooltip */ |
| 79 | const char *tip_on; |
| 80 | |
| 81 | /** @brief Filename for 'off' image or NULL for an action icon */ |
| 82 | const char *icon_off; |
| 83 | |
| 84 | /** @brief Text for 'off tooltip */ |
| 85 | const char *tip_off; |
| 86 | |
| 87 | /** @brief Associated menu item or NULL */ |
| 88 | const char *menuitem; |
| 89 | |
| 90 | /** @brief Events that change this icon, separated by spaces */ |
| 91 | const char *events; |
| 92 | |
| 93 | /** @brief @ref eclient.h function to call to go from off to on |
| 94 | * |
| 95 | * For action buttons, this should be NULL. |
| 96 | */ |
| 97 | int (*action_go_on)(disorder_eclient *c, |
| 98 | disorder_eclient_no_response *completed, |
| 99 | void *v); |
| 100 | |
| 101 | /** @brief @ref eclient.h function to call to go from on to off |
| 102 | * |
| 103 | * For action buttons, this action is used. |
| 104 | */ |
| 105 | int (*action_go_off)(disorder_eclient *c, |
| 106 | disorder_eclient_no_response *completed, |
| 107 | void *v); |
| 108 | |
| 109 | /** @brief Get button state |
| 110 | * @return 1 for on, 0 for off |
| 111 | */ |
| 112 | int (*on)(void); |
| 113 | |
| 114 | /** @brief Get button sensitivity |
| 115 | * @return 1 for sensitive, 0 for insensitive |
| 116 | * |
| 117 | * Can be NULL for always sensitive. |
| 118 | */ |
| 119 | int (*sensitive)(void); |
| 120 | |
| 121 | /** @brief Pointer to button */ |
| 122 | GtkWidget *button; |
| 123 | |
| 124 | /** @brief Pointer to menu item */ |
| 125 | GtkWidget *item; |
| 126 | |
| 127 | GtkWidget *image_on; |
| 128 | GtkWidget *image_off; |
| 129 | }; |
| 130 | |
| 131 | static int pause_resume_on(void) { |
| 132 | return !(last_state & DISORDER_TRACK_PAUSED); |
| 133 | } |
| 134 | |
| 135 | static int pause_resume_sensitive(void) { |
| 136 | return !!(last_state & DISORDER_PLAYING) |
| 137 | && (last_rights & RIGHT_PAUSE); |
| 138 | } |
| 139 | |
| 140 | static int scratch_sensitive(void) { |
| 141 | return !!(last_state & DISORDER_PLAYING) |
| 142 | && right_scratchable(last_rights, config->username, playing_track); |
| 143 | } |
| 144 | |
| 145 | static int random_sensitive(void) { |
| 146 | return !!(last_rights & RIGHT_GLOBAL_PREFS); |
| 147 | } |
| 148 | |
| 149 | static int random_enabled(void) { |
| 150 | return !!(last_state & DISORDER_RANDOM_ENABLED); |
| 151 | } |
| 152 | |
| 153 | static int playing_sensitive(void) { |
| 154 | return !!(last_rights & RIGHT_GLOBAL_PREFS); |
| 155 | } |
| 156 | |
| 157 | static int playing_enabled(void) { |
| 158 | return !!(last_state & DISORDER_PLAYING_ENABLED); |
| 159 | } |
| 160 | |
| 161 | static int rtp_enabled(void) { |
| 162 | return rtp_is_running; |
| 163 | } |
| 164 | |
| 165 | static int rtp_sensitive(void) { |
| 166 | return rtp_supported; |
| 167 | } |
| 168 | |
| 169 | /** @brief Table of all icons */ |
| 170 | static struct icon icons[] = { |
| 171 | { |
| 172 | icon_on: "pause32.png", |
| 173 | tip_on: "Pause playing track", |
| 174 | icon_off: "play32.png", |
| 175 | tip_off: "Resume playing track", |
| 176 | menuitem: "<GdisorderMain>/Control/Playing", |
| 177 | on: pause_resume_on, |
| 178 | sensitive: pause_resume_sensitive, |
| 179 | action_go_on: disorder_eclient_resume, |
| 180 | action_go_off: disorder_eclient_pause, |
| 181 | events: "pause-changed playing-changed rights-changed", |
| 182 | }, |
| 183 | { |
| 184 | icon_on: "cross32.png", |
| 185 | tip_on: "Cancel playing track", |
| 186 | menuitem: "<GdisorderMain>/Control/Scratch", |
| 187 | sensitive: scratch_sensitive, |
| 188 | action_go_off: disorder_eclient_scratch_playing, |
| 189 | events: "playing-track-changed rights-changed", |
| 190 | }, |
| 191 | { |
| 192 | icon_on: "randomenabled32.png", |
| 193 | tip_on: "Disable random play", |
| 194 | icon_off: "randomdisabled32.png", |
| 195 | tip_off: "Enable random play", |
| 196 | menuitem: "<GdisorderMain>/Control/Random play", |
| 197 | on: random_enabled, |
| 198 | sensitive: random_sensitive, |
| 199 | action_go_on: disorder_eclient_random_enable, |
| 200 | action_go_off: disorder_eclient_random_disable, |
| 201 | events: "random-changed rights-changed", |
| 202 | }, |
| 203 | { |
| 204 | icon_on: "playenabled32.png", |
| 205 | tip_on: "Disable play", |
| 206 | icon_off: "playdisabled32.png", |
| 207 | tip_off: "Enable play", |
| 208 | on: playing_enabled, |
| 209 | sensitive: playing_sensitive, |
| 210 | action_go_on: disorder_eclient_enable, |
| 211 | action_go_off: disorder_eclient_disable, |
| 212 | events: "enabled-changed rights-changed", |
| 213 | }, |
| 214 | { |
| 215 | icon_on: "rtpenabled32.png", |
| 216 | tip_on: "Stop playing network stream", |
| 217 | icon_off: "rtpdisabled32.png", |
| 218 | tip_off: "Play network stream", |
| 219 | menuitem: "<GdisorderMain>/Control/Network player", |
| 220 | on: rtp_enabled, |
| 221 | sensitive: rtp_sensitive, |
| 222 | action_go_on: enable_rtp, |
| 223 | action_go_off: disable_rtp, |
| 224 | events: "rtp-changed", |
| 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 Create the control bar */ |
| 237 | GtkWidget *control_widget(void) { |
| 238 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
| 239 | int n; |
| 240 | |
| 241 | D(("control_widget")); |
| 242 | assert(mainmenufactory); /* ordering must be right */ |
| 243 | for(n = 0; n < NICONS; ++n) { |
| 244 | /* Create the button */ |
| 245 | icons[n].button = gtk_button_new(); |
| 246 | gtk_widget_set_style(icons[n].button, tool_style); |
| 247 | icons[n].image_on = gtk_image_new_from_pixbuf(find_image(icons[n].icon_on)); |
| 248 | gtk_widget_set_style(icons[n].image_on, tool_style); |
| 249 | g_object_ref(icons[n].image_on); |
| 250 | /* If it's a toggle icon, create the 'off' half too */ |
| 251 | if(icons[n].icon_off) { |
| 252 | icons[n].image_off = gtk_image_new_from_pixbuf(find_image(icons[n].icon_off)); |
| 253 | gtk_widget_set_style(icons[n].image_off, tool_style); |
| 254 | g_object_ref(icons[n].image_off); |
| 255 | } |
| 256 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", |
| 257 | G_CALLBACK(clicked_icon), &icons[n]); |
| 258 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
| 259 | * taller things in the control bar */ |
| 260 | vbox = gtk_vbox_new(FALSE, 0); |
| 261 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); |
| 262 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); |
| 263 | if(icons[n].menuitem) { |
| 264 | /* Find the menu item */ |
| 265 | icons[n].item = gtk_item_factory_get_widget(mainmenufactory, |
| 266 | icons[n].menuitem); |
| 267 | if(icons[n].icon_off) |
| 268 | g_signal_connect(G_OBJECT(icons[n].item), "toggled", |
| 269 | G_CALLBACK(toggled_menu), &icons[n]); |
| 270 | else |
| 271 | g_signal_connect(G_OBJECT(icons[n].item), "activate", |
| 272 | G_CALLBACK(clicked_menu), &icons[n]); |
| 273 | } |
| 274 | /* Make sure the icon is updated when relevant things changed */ |
| 275 | char **events = split(icons[n].events, 0, 0, 0, 0); |
| 276 | while(*events) |
| 277 | event_register(*events++, icon_changed, &icons[n]); |
| 278 | event_register("connected-changed", icon_changed, &icons[n]); |
| 279 | } |
| 280 | /* create the adjustments for the volume control */ |
| 281 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, |
| 282 | goesupto / 20, goesupto / 20, |
| 283 | 0)); |
| 284 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, |
| 285 | 0.2, 0.2, 0)); |
| 286 | /* the volume control */ |
| 287 | volume_widget = gtk_hscale_new(volume_adj); |
| 288 | balance_widget = gtk_hscale_new(balance_adj); |
| 289 | gtk_widget_set_style(volume_widget, tool_style); |
| 290 | gtk_widget_set_style(balance_widget, tool_style); |
| 291 | gtk_scale_set_digits(GTK_SCALE(volume_widget), 10); |
| 292 | gtk_scale_set_digits(GTK_SCALE(balance_widget), 10); |
| 293 | gtk_widget_set_size_request(volume_widget, 192, -1); |
| 294 | gtk_widget_set_size_request(balance_widget, 192, -1); |
| 295 | gtk_tooltips_set_tip(tips, volume_widget, "Volume", ""); |
| 296 | gtk_tooltips_set_tip(tips, balance_widget, "Balance", ""); |
| 297 | gtk_box_pack_start(GTK_BOX(hbox), volume_widget, FALSE, TRUE, 0); |
| 298 | gtk_box_pack_start(GTK_BOX(hbox), balance_widget, FALSE, TRUE, 0); |
| 299 | /* space updates rather than hammering the server */ |
| 300 | gtk_range_set_update_policy(GTK_RANGE(volume_widget), GTK_UPDATE_DELAYED); |
| 301 | gtk_range_set_update_policy(GTK_RANGE(balance_widget), GTK_UPDATE_DELAYED); |
| 302 | /* notice when the adjustments are changed */ |
| 303 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", |
| 304 | G_CALLBACK(volume_adjusted), 0); |
| 305 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", |
| 306 | G_CALLBACK(volume_adjusted), 0); |
| 307 | /* format the volume/balance values ourselves */ |
| 308 | g_signal_connect(G_OBJECT(volume_widget), "format-value", |
| 309 | G_CALLBACK(format_volume), 0); |
| 310 | g_signal_connect(G_OBJECT(balance_widget), "format-value", |
| 311 | G_CALLBACK(format_balance), 0); |
| 312 | event_register("volume-changed", volume_changed, 0); |
| 313 | event_register("rtp-changed", volume_changed, 0); |
| 314 | return hbox; |
| 315 | } |
| 316 | |
| 317 | /** @brief Update the volume control when it changes */ |
| 318 | static void volume_changed(const char attribute((unused)) *event, |
| 319 | void attribute((unused)) *eventdata, |
| 320 | void attribute((unused)) *callbackdata) { |
| 321 | double l, r; |
| 322 | gboolean volume_supported; |
| 323 | |
| 324 | D(("volume_changed")); |
| 325 | ++suppress_actions; |
| 326 | /* Only display volume/balance controls if they will work */ |
| 327 | if(!rtp_supported |
| 328 | || (rtp_supported && mixer_supported(DEFAULT_BACKEND))) |
| 329 | volume_supported = TRUE; |
| 330 | else |
| 331 | volume_supported = FALSE; |
| 332 | /* TODO: if the server doesn't know how to set the volume [but isn't using |
| 333 | * network play] then we should have volume_supported = FALSE */ |
| 334 | if(volume_supported) { |
| 335 | gtk_widget_show(volume_widget); |
| 336 | gtk_widget_show(balance_widget); |
| 337 | l = volume_l / 100.0; |
| 338 | r = volume_r / 100.0; |
| 339 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); |
| 340 | gtk_adjustment_set_value(balance_adj, balance(l, r)); |
| 341 | } else { |
| 342 | gtk_widget_hide(volume_widget); |
| 343 | gtk_widget_hide(balance_widget); |
| 344 | } |
| 345 | --suppress_actions; |
| 346 | } |
| 347 | |
| 348 | /** @brief Update the state of one of the control icons |
| 349 | */ |
| 350 | static void icon_changed(const char attribute((unused)) *event, |
| 351 | void attribute((unused)) *evendata, |
| 352 | void *callbackdata) { |
| 353 | //fprintf(stderr, "icon_changed (%s)\n", event); |
| 354 | const struct icon *const icon = callbackdata; |
| 355 | int on = icon->on ? icon->on() : 1; |
| 356 | int sensitive = icon->sensitive ? icon->sensitive() : 1; |
| 357 | //fprintf(stderr, "sensitive->%d\n", sensitive); |
| 358 | GtkWidget *child, *newchild; |
| 359 | |
| 360 | ++suppress_actions; |
| 361 | /* If the connection is down nothing is ever usable */ |
| 362 | if(!(last_state & DISORDER_CONNECTED)) |
| 363 | sensitive = 0; |
| 364 | //fprintf(stderr, "(checked connected) sensitive->%d\n", sensitive); |
| 365 | /* Replace the child */ |
| 366 | newchild = on ? icon->image_on : icon->image_off; |
| 367 | child = gtk_bin_get_child(GTK_BIN(icon->button)); |
| 368 | if(child != newchild) { |
| 369 | if(child) |
| 370 | gtk_container_remove(GTK_CONTAINER(icon->button), child); |
| 371 | gtk_container_add(GTK_CONTAINER(icon->button), newchild); |
| 372 | gtk_widget_show(newchild); |
| 373 | } |
| 374 | /* If you disable play or random play NOT via the icon (for instance, via the |
| 375 | * edit menu or via a completely separate command line invocation) then the |
| 376 | * icon shows up as insensitive. Hover the mouse over it and the correct |
| 377 | * state is immediately displayed. sensitive and GTK_WIDGET_SENSITIVE show |
| 378 | * it to be in the correct state, so I think this is may be a GTK+ bug. */ |
| 379 | if(icon->tip_on) |
| 380 | gtk_tooltips_set_tip(tips, icon->button, |
| 381 | on ? icon->tip_on : icon->tip_off, ""); |
| 382 | gtk_widget_set_sensitive(icon->button, sensitive); |
| 383 | /* Icons with an associated menu item */ |
| 384 | if(icon->item) { |
| 385 | if(icon->icon_off) |
| 386 | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), on); |
| 387 | gtk_widget_set_sensitive(icon->item, sensitive); |
| 388 | } |
| 389 | --suppress_actions; |
| 390 | } |
| 391 | |
| 392 | static void icon_action_completed(void attribute((unused)) *v, |
| 393 | const char *err) { |
| 394 | if(err) |
| 395 | popup_protocol_error(0, err); |
| 396 | } |
| 397 | |
| 398 | static void clicked_icon(GtkButton attribute((unused)) *button, |
| 399 | gpointer userdata) { |
| 400 | const struct icon *icon = userdata; |
| 401 | |
| 402 | if(suppress_actions) |
| 403 | return; |
| 404 | if(!icon->on || icon->on()) |
| 405 | icon->action_go_off(client, icon_action_completed, 0); |
| 406 | else |
| 407 | icon->action_go_on(client, icon_action_completed, 0); |
| 408 | } |
| 409 | |
| 410 | static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem, |
| 411 | gpointer userdata) { |
| 412 | clicked_icon(NULL, userdata); |
| 413 | } |
| 414 | |
| 415 | static void toggled_menu(GtkCheckMenuItem attribute((unused)) *menuitem, |
| 416 | gpointer userdata) { |
| 417 | clicked_icon(NULL, userdata); |
| 418 | } |
| 419 | |
| 420 | /** @brief Called when a volume command completes */ |
| 421 | static void volume_completed(void attribute((unused)) *v, |
| 422 | const char *err, |
| 423 | int attribute((unused)) l, |
| 424 | int attribute((unused)) r) { |
| 425 | if(err) |
| 426 | popup_protocol_error(0, err); |
| 427 | /* We don't set the UI's notion of the volume here, it is set from the log |
| 428 | * regardless of the reason it changed */ |
| 429 | } |
| 430 | |
| 431 | /** @brief Called when the volume has been adjusted */ |
| 432 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
| 433 | gpointer attribute((unused)) user_data) { |
| 434 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; |
| 435 | double b = gtk_adjustment_get_value(balance_adj); |
| 436 | |
| 437 | if(suppress_actions) |
| 438 | /* This is the result of an update from the server, not a change from the |
| 439 | * user. Don't feedback! */ |
| 440 | return; |
| 441 | D(("volume_adjusted")); |
| 442 | /* force to 'stereotypical' values */ |
| 443 | v = nearbyint(100 * v) / 100; |
| 444 | b = nearbyint(5 * b) / 5; |
| 445 | /* Set the volume. We don't want a reply, we'll get the actual new volume |
| 446 | * from the log. */ |
| 447 | if(rtp_supported) { |
| 448 | int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100); |
| 449 | mixer_control(DEFAULT_BACKEND, &l, &r, 1); |
| 450 | } else |
| 451 | disorder_eclient_volume(client, volume_completed, |
| 452 | nearbyint(left(v, b) * 100), |
| 453 | nearbyint(right(v, b) * 100), |
| 454 | 0); |
| 455 | } |
| 456 | |
| 457 | /** @brief Formats the volume value */ |
| 458 | static gchar *format_volume(GtkScale attribute((unused)) *scale, |
| 459 | gdouble value) { |
| 460 | char s[32]; |
| 461 | |
| 462 | snprintf(s, sizeof s, "%.1f", (double)value); |
| 463 | return g_strdup(s); |
| 464 | } |
| 465 | |
| 466 | /** @brief Formats the balance value */ |
| 467 | static gchar *format_balance(GtkScale attribute((unused)) *scale, |
| 468 | gdouble value) { |
| 469 | char s[32]; |
| 470 | |
| 471 | if(fabs(value) < 0.1) |
| 472 | return g_strdup("0"); |
| 473 | snprintf(s, sizeof s, "%+.1f", (double)value); |
| 474 | return g_strdup(s); |
| 475 | } |
| 476 | |
| 477 | /* Volume mapping. We consider left, right, volume to be in [0,1] |
| 478 | * and balance to be in [-1,1]. |
| 479 | * |
| 480 | * First, we just have volume = max(left, right). |
| 481 | * |
| 482 | * Balance we consider to linearly represent the amount by which the quieter |
| 483 | * channel differs from the louder. In detail: |
| 484 | * |
| 485 | * if right > left then balance > 0: |
| 486 | * balance = 0 => left = right (as an endpoint, not an instance) |
| 487 | * balance = 1 => left = 0 |
| 488 | * fitting to linear, left = right * (1 - balance) |
| 489 | * so balance = 1 - left / right |
| 490 | * (right > left => right > 0 so no division by 0.) |
| 491 | * |
| 492 | * if left > right then balance < 0: |
| 493 | * balance = 0 => right = left (same caveat as above) |
| 494 | * balance = -1 => right = 0 |
| 495 | * again fitting to linear, right = left * (1 + balance) |
| 496 | * so balance = right / left - 1 |
| 497 | * (left > right => left > 0 so no division by 0.) |
| 498 | * |
| 499 | * if left = right then we just have balance = 0. |
| 500 | * |
| 501 | * Thanks to Clive and Andrew. |
| 502 | */ |
| 503 | |
| 504 | /** @brief Return the greater of @p x and @p y */ |
| 505 | static double max(double x, double y) { |
| 506 | return x > y ? x : y; |
| 507 | } |
| 508 | |
| 509 | /** @brief Compute the left channel volume */ |
| 510 | static double left(double v, double b) { |
| 511 | if(b > 0) /* volume = right */ |
| 512 | return v * (1 - b); |
| 513 | else /* volume = left */ |
| 514 | return v; |
| 515 | } |
| 516 | |
| 517 | /** @brief Compute the right channel volume */ |
| 518 | static double right(double v, double b) { |
| 519 | if(b > 0) /* volume = right */ |
| 520 | return v; |
| 521 | else /* volume = left */ |
| 522 | return v * (1 + b); |
| 523 | } |
| 524 | |
| 525 | /** @brief Compute the overall volume */ |
| 526 | static double volume(double l, double r) { |
| 527 | return max(l, r); |
| 528 | } |
| 529 | |
| 530 | /** @brief Compute the balance */ |
| 531 | static double balance(double l, double r) { |
| 532 | if(l > r) |
| 533 | return r / l - 1; |
| 534 | else if(r > l) |
| 535 | return 1 - l / r; |
| 536 | else /* left = right */ |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | /** @brief Called to enable RTP play |
| 541 | * |
| 542 | * Rather odd signature is to fit in with the other icons which all call @ref |
| 543 | * lib/eclient.h functions. |
| 544 | */ |
| 545 | static int enable_rtp(disorder_eclient attribute((unused)) *c, |
| 546 | disorder_eclient_no_response attribute((unused)) *completed, |
| 547 | void attribute((unused)) *v) { |
| 548 | start_rtp(); |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | /** @brief Called to disable RTP play |
| 553 | * |
| 554 | * Rather odd signature is to fit in with the other icons which all call @ref |
| 555 | * lib/eclient.h functions. |
| 556 | */ |
| 557 | static int disable_rtp(disorder_eclient attribute((unused)) *c, |
| 558 | disorder_eclient_no_response attribute((unused)) *completed, |
| 559 | void attribute((unused)) *v) { |
| 560 | stop_rtp(); |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | Local Variables: |
| 566 | c-basic-offset:2 |
| 567 | comment-column:40 |
| 568 | fill-column:79 |
| 569 | indent-tabs-mode:nil |
| 570 | End: |
| 571 | */ |