Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
3849817f | 3 | * Copyright (C) 2006-2008 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
219dc95c RK |
18 | /** @file disobedience/control.c |
19 | * @brief Volume control and buttons | |
20 | */ | |
460b9539 | 21 | |
22 | #include "disobedience.h" | |
23 | ||
e9b70a84 | 24 | /* Forward declarations ---------------------------------------------------- */ |
25 | ||
460b9539 | 26 | struct icon; |
27 | ||
460b9539 | 28 | static void clicked_icon(GtkButton *, gpointer); |
ac6bf2ba | 29 | static void clicked_menu(GtkMenuItem *, gpointer userdata); |
2d504956 | 30 | static void toggled_menu(GtkCheckMenuItem *, gpointer userdata); |
460b9539 | 31 | |
a99c4e9a RK |
32 | static int enable_rtp(disorder_eclient *c, |
33 | disorder_eclient_no_response *completed, | |
34 | void *v); | |
35 | static int disable_rtp(disorder_eclient *c, | |
36 | disorder_eclient_no_response *completed, | |
37 | void *v); | |
38 | ||
460b9539 | 39 | static double left(double v, double b); |
40 | static double right(double v, double b); | |
41 | static double volume(double l, double r); | |
42 | static double balance(double l, double r); | |
43 | ||
44 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); | |
45 | static gchar *format_volume(GtkScale *scale, gdouble value); | |
46 | static gchar *format_balance(GtkScale *scale, gdouble value); | |
47 | ||
6856f665 RK |
48 | static void icon_changed(const char *event, |
49 | void *evendata, | |
50 | void *callbackdata); | |
1f868ca3 RK |
51 | static void volume_changed(const char *event, |
52 | void *eventdata, | |
53 | void *callbackdata); | |
54 | ||
460b9539 | 55 | /* Control bar ------------------------------------------------------------- */ |
56 | ||
fb44b59e RK |
57 | /** @brief Guard against feedback */ |
58 | int suppress_actions = 1; | |
460b9539 | 59 | |
219dc95c RK |
60 | /** @brief Definition of an icon |
61 | * | |
3849817f RK |
62 | * We have two kinds of icon: |
63 | * - action icons, which just do something but don't have a state as such | |
64 | * - toggle icons, which toggle between two states ("on" and "off"). | |
65 | * | |
66 | * The scratch button is an action icon; currently all the others are toggle | |
67 | * icons. | |
68 | * | |
69 | * (All icons can be sensitive or insensitive, separately to the above.) | |
219dc95c RK |
70 | */ |
71 | struct icon { | |
3849817f RK |
72 | /** @brief Filename for 'on' image */ |
73 | const char *icon_on; | |
74 | ||
75 | /** @brief Text for 'on' tooltip */ | |
76 | const char *tip_on; | |
219dc95c | 77 | |
3849817f RK |
78 | /** @brief Filename for 'off' image or NULL for an action icon */ |
79 | const char *icon_off; | |
80 | ||
81 | /** @brief Text for 'off tooltip */ | |
82 | const char *tip_off; | |
219dc95c | 83 | |
ac6bf2ba RK |
84 | /** @brief Associated menu item or NULL */ |
85 | const char *menuitem; | |
219dc95c | 86 | |
6856f665 RK |
87 | /** @brief Events that change this icon, separated by spaces */ |
88 | const char *events; | |
89 | ||
3849817f RK |
90 | /** @brief @ref eclient.h function to call to go from off to on |
91 | * | |
92 | * For action buttons, this should be NULL. | |
93 | */ | |
94 | int (*action_go_on)(disorder_eclient *c, | |
95 | disorder_eclient_no_response *completed, | |
96 | void *v); | |
219dc95c | 97 | |
3849817f RK |
98 | /** @brief @ref eclient.h function to call to go from on to off |
99 | * | |
100 | * For action buttons, this action is used. | |
101 | */ | |
102 | int (*action_go_off)(disorder_eclient *c, | |
103 | disorder_eclient_no_response *completed, | |
104 | void *v); | |
219dc95c | 105 | |
3849817f RK |
106 | /** @brief Get button state |
107 | * @return 1 for on, 0 for off | |
108 | */ | |
109 | int (*on)(void); | |
110 | ||
111 | /** @brief Get button sensitivity | |
112 | * @return 1 for sensitive, 0 for insensitive | |
113 | * | |
114 | * Can be NULL for always sensitive. | |
115 | */ | |
116 | int (*sensitive)(void); | |
2d504956 | 117 | |
219dc95c | 118 | /** @brief Pointer to button */ |
460b9539 | 119 | GtkWidget *button; |
ac6bf2ba RK |
120 | |
121 | /** @brief Pointer to menu item */ | |
122 | GtkWidget *item; | |
3849817f RK |
123 | |
124 | GtkWidget *image_on; | |
125 | GtkWidget *image_off; | |
219dc95c RK |
126 | }; |
127 | ||
3849817f RK |
128 | static int pause_resume_on(void) { |
129 | return !(last_state & DISORDER_TRACK_PAUSED); | |
130 | } | |
131 | ||
132 | static int pause_resume_sensitive(void) { | |
6f09d54d RK |
133 | return !!(last_state & DISORDER_PLAYING) |
134 | && (last_rights & RIGHT_PAUSE); | |
3849817f RK |
135 | } |
136 | ||
137 | static int scratch_sensitive(void) { | |
6f09d54d | 138 | return !!(last_state & DISORDER_PLAYING) |
afe9f743 | 139 | && right_scratchable(last_rights, config->username, playing_track); |
6f09d54d RK |
140 | } |
141 | ||
142 | static int random_sensitive(void) { | |
143 | return !!(last_rights & RIGHT_GLOBAL_PREFS); | |
3849817f RK |
144 | } |
145 | ||
146 | static int random_enabled(void) { | |
147 | return !!(last_state & DISORDER_RANDOM_ENABLED); | |
148 | } | |
149 | ||
6f09d54d RK |
150 | static int playing_sensitive(void) { |
151 | return !!(last_rights & RIGHT_GLOBAL_PREFS); | |
152 | } | |
153 | ||
3849817f RK |
154 | static int playing_enabled(void) { |
155 | return !!(last_state & DISORDER_PLAYING_ENABLED); | |
156 | } | |
2d504956 | 157 | |
3849817f RK |
158 | static int rtp_enabled(void) { |
159 | return rtp_is_running; | |
160 | } | |
161 | ||
162 | static int rtp_sensitive(void) { | |
163 | return rtp_supported; | |
164 | } | |
2d504956 | 165 | |
219dc95c RK |
166 | /** @brief Table of all icons */ |
167 | static struct icon icons[] = { | |
2d504956 | 168 | { |
5c739b23 | 169 | icon_on: "pause32.png", |
3849817f | 170 | tip_on: "Pause playing track", |
5c739b23 | 171 | icon_off: "play32.png", |
3849817f RK |
172 | tip_off: "Resume playing track", |
173 | menuitem: "<GdisorderMain>/Control/Playing", | |
174 | on: pause_resume_on, | |
175 | sensitive: pause_resume_sensitive, | |
176 | action_go_on: disorder_eclient_resume, | |
177 | action_go_off: disorder_eclient_pause, | |
6856f665 | 178 | events: "pause-changed playing-changed rights-changed", |
2d504956 RK |
179 | }, |
180 | { | |
5c739b23 | 181 | icon_on: "cross32.png", |
3849817f RK |
182 | tip_on: "Cancel playing track", |
183 | menuitem: "<GdisorderMain>/Control/Scratch", | |
184 | sensitive: scratch_sensitive, | |
185 | action_go_off: disorder_eclient_scratch_playing, | |
6856f665 | 186 | events: "playing-track-changed rights-changed", |
2d504956 RK |
187 | }, |
188 | { | |
5c739b23 | 189 | icon_on: "randomenabled32.png", |
3849817f | 190 | tip_on: "Disable random play", |
5c739b23 | 191 | icon_off: "randomdisabled32.png", |
3849817f RK |
192 | tip_off: "Enable random play", |
193 | menuitem: "<GdisorderMain>/Control/Random play", | |
194 | on: random_enabled, | |
6f09d54d | 195 | sensitive: random_sensitive, |
3849817f RK |
196 | action_go_on: disorder_eclient_random_enable, |
197 | action_go_off: disorder_eclient_random_disable, | |
6856f665 | 198 | events: "random-changed rights-changed", |
2d504956 RK |
199 | }, |
200 | { | |
5c739b23 | 201 | icon_on: "playenabled32.png", |
3849817f | 202 | tip_on: "Disable play", |
5c739b23 | 203 | icon_off: "playdisabled32.png", |
3849817f RK |
204 | tip_off: "Enable play", |
205 | on: playing_enabled, | |
6f09d54d | 206 | sensitive: playing_sensitive, |
3849817f RK |
207 | action_go_on: disorder_eclient_enable, |
208 | action_go_off: disorder_eclient_disable, | |
6856f665 | 209 | events: "enabled-changed rights-changed", |
2d504956 RK |
210 | }, |
211 | { | |
5c739b23 | 212 | icon_on: "rtpenabled32.png", |
3849817f | 213 | tip_on: "Stop playing network stream", |
5c739b23 | 214 | icon_off: "rtpdisabled32.png", |
3849817f RK |
215 | tip_off: "Play network stream", |
216 | menuitem: "<GdisorderMain>/Control/Network player", | |
217 | on: rtp_enabled, | |
218 | sensitive: rtp_sensitive, | |
219 | action_go_on: enable_rtp, | |
6856f665 RK |
220 | action_go_off: disable_rtp, |
221 | events: "rtp-changed", | |
2d504956 | 222 | }, |
460b9539 | 223 | }; |
219dc95c RK |
224 | |
225 | /** @brief Count of icons */ | |
460b9539 | 226 | #define NICONS (int)(sizeof icons / sizeof *icons) |
227 | ||
219dc95c RK |
228 | static GtkAdjustment *volume_adj; |
229 | static GtkAdjustment *balance_adj; | |
3c499fe7 RK |
230 | static GtkWidget *volume_widget; |
231 | static GtkWidget *balance_widget; | |
460b9539 | 232 | |
219dc95c | 233 | /** @brief Create the control bar */ |
e9b70a84 | 234 | GtkWidget *control_widget(void) { |
460b9539 | 235 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
460b9539 | 236 | int n; |
237 | ||
238 | D(("control_widget")); | |
ac6bf2ba | 239 | assert(mainmenufactory); /* ordering must be right */ |
460b9539 | 240 | for(n = 0; n < NICONS; ++n) { |
3849817f | 241 | /* Create the button */ |
3849817f RK |
242 | icons[n].button = gtk_button_new(); |
243 | gtk_widget_set_style(icons[n].button, tool_style); | |
244 | icons[n].image_on = gtk_image_new_from_pixbuf(find_image(icons[n].icon_on)); | |
245 | gtk_widget_set_style(icons[n].image_on, tool_style); | |
246 | g_object_ref(icons[n].image_on); | |
247 | /* If it's a toggle icon, create the 'off' half too */ | |
248 | if(icons[n].icon_off) { | |
249 | icons[n].image_off = gtk_image_new_from_pixbuf(find_image(icons[n].icon_off)); | |
250 | gtk_widget_set_style(icons[n].image_off, tool_style); | |
251 | g_object_ref(icons[n].image_off); | |
252 | } | |
460b9539 | 253 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", |
ac6bf2ba | 254 | G_CALLBACK(clicked_icon), &icons[n]); |
460b9539 | 255 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
256 | * taller things in the control bar */ | |
257 | vbox = gtk_vbox_new(FALSE, 0); | |
258 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); | |
259 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); | |
ac6bf2ba | 260 | if(icons[n].menuitem) { |
3849817f | 261 | /* Find the menu item */ |
ac6bf2ba RK |
262 | icons[n].item = gtk_item_factory_get_widget(mainmenufactory, |
263 | icons[n].menuitem); | |
3849817f | 264 | if(icons[n].icon_off) |
2d504956 RK |
265 | g_signal_connect(G_OBJECT(icons[n].item), "toggled", |
266 | G_CALLBACK(toggled_menu), &icons[n]); | |
3849817f | 267 | else |
2d504956 RK |
268 | g_signal_connect(G_OBJECT(icons[n].item), "activate", |
269 | G_CALLBACK(clicked_menu), &icons[n]); | |
ac6bf2ba | 270 | } |
6856f665 RK |
271 | /* Make sure the icon is updated when relevant things changed */ |
272 | char **events = split(icons[n].events, 0, 0, 0, 0); | |
273 | while(*events) | |
274 | event_register(*events++, icon_changed, &icons[n]); | |
f513e538 | 275 | event_register("connected-changed", icon_changed, &icons[n]); |
460b9539 | 276 | } |
277 | /* create the adjustments for the volume control */ | |
278 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, | |
279 | goesupto / 20, goesupto / 20, | |
280 | 0)); | |
281 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, | |
282 | 0.2, 0.2, 0)); | |
283 | /* the volume control */ | |
3c499fe7 | 284 | volume_widget = gtk_hscale_new(volume_adj); |
3c499fe7 RK |
285 | balance_widget = gtk_hscale_new(balance_adj); |
286 | gtk_widget_set_style(volume_widget, tool_style); | |
287 | gtk_widget_set_style(balance_widget, tool_style); | |
288 | gtk_scale_set_digits(GTK_SCALE(volume_widget), 10); | |
289 | gtk_scale_set_digits(GTK_SCALE(balance_widget), 10); | |
290 | gtk_widget_set_size_request(volume_widget, 192, -1); | |
291 | gtk_widget_set_size_request(balance_widget, 192, -1); | |
292 | gtk_tooltips_set_tip(tips, volume_widget, "Volume", ""); | |
293 | gtk_tooltips_set_tip(tips, balance_widget, "Balance", ""); | |
294 | gtk_box_pack_start(GTK_BOX(hbox), volume_widget, FALSE, TRUE, 0); | |
295 | gtk_box_pack_start(GTK_BOX(hbox), balance_widget, FALSE, TRUE, 0); | |
460b9539 | 296 | /* space updates rather than hammering the server */ |
3c499fe7 RK |
297 | gtk_range_set_update_policy(GTK_RANGE(volume_widget), GTK_UPDATE_DELAYED); |
298 | gtk_range_set_update_policy(GTK_RANGE(balance_widget), GTK_UPDATE_DELAYED); | |
460b9539 | 299 | /* notice when the adjustments are changed */ |
300 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", | |
301 | G_CALLBACK(volume_adjusted), 0); | |
302 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", | |
303 | G_CALLBACK(volume_adjusted), 0); | |
304 | /* format the volume/balance values ourselves */ | |
3c499fe7 | 305 | g_signal_connect(G_OBJECT(volume_widget), "format-value", |
460b9539 | 306 | G_CALLBACK(format_volume), 0); |
3c499fe7 | 307 | g_signal_connect(G_OBJECT(balance_widget), "format-value", |
460b9539 | 308 | G_CALLBACK(format_balance), 0); |
1f868ca3 | 309 | event_register("volume-changed", volume_changed, 0); |
6856f665 | 310 | event_register("rtp-changed", volume_changed, 0); |
460b9539 | 311 | return hbox; |
312 | } | |
313 | ||
6d1302f0 | 314 | /** @brief Update the volume control when it changes */ |
1f868ca3 RK |
315 | static void volume_changed(const char attribute((unused)) *event, |
316 | void attribute((unused)) *eventdata, | |
317 | void attribute((unused)) *callbackdata) { | |
460b9539 | 318 | double l, r; |
6856f665 | 319 | gboolean volume_supported; |
460b9539 | 320 | |
1f868ca3 | 321 | D(("volume_changed")); |
fb44b59e | 322 | ++suppress_actions; |
6856f665 RK |
323 | /* Only display volume/balance controls if they will work */ |
324 | if(!rtp_supported | |
b50cfb8a | 325 | || (rtp_supported && backend && backend->set_volume)) |
6856f665 RK |
326 | volume_supported = TRUE; |
327 | else | |
328 | volume_supported = FALSE; | |
329 | /* TODO: if the server doesn't know how to set the volume [but isn't using | |
330 | * network play] then we should have volume_supported = FALSE */ | |
331 | if(volume_supported) { | |
332 | gtk_widget_show(volume_widget); | |
333 | gtk_widget_show(balance_widget); | |
334 | l = volume_l / 100.0; | |
335 | r = volume_r / 100.0; | |
336 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); | |
337 | gtk_adjustment_set_value(balance_adj, balance(l, r)); | |
338 | } else { | |
339 | gtk_widget_hide(volume_widget); | |
340 | gtk_widget_hide(balance_widget); | |
341 | } | |
fb44b59e | 342 | --suppress_actions; |
460b9539 | 343 | } |
344 | ||
ad58ebcc | 345 | /** @brief Update the state of one of the control icons |
ad58ebcc | 346 | */ |
6856f665 RK |
347 | static void icon_changed(const char attribute((unused)) *event, |
348 | void attribute((unused)) *evendata, | |
349 | void *callbackdata) { | |
00e0c652 | 350 | //fprintf(stderr, "icon_changed (%s)\n", event); |
6856f665 | 351 | const struct icon *const icon = callbackdata; |
3849817f RK |
352 | int on = icon->on ? icon->on() : 1; |
353 | int sensitive = icon->sensitive ? icon->sensitive() : 1; | |
00e0c652 | 354 | //fprintf(stderr, "sensitive->%d\n", sensitive); |
3849817f RK |
355 | GtkWidget *child, *newchild; |
356 | ||
357 | ++suppress_actions; | |
ad58ebcc | 358 | /* If the connection is down nothing is ever usable */ |
00959300 | 359 | if(!(last_state & DISORDER_CONNECTED)) |
3849817f | 360 | sensitive = 0; |
00e0c652 | 361 | //fprintf(stderr, "(checked connected) sensitive->%d\n", sensitive); |
3849817f RK |
362 | /* Replace the child */ |
363 | newchild = on ? icon->image_on : icon->image_off; | |
364 | child = gtk_bin_get_child(GTK_BIN(icon->button)); | |
365 | if(child != newchild) { | |
366 | if(child) | |
367 | gtk_container_remove(GTK_CONTAINER(icon->button), child); | |
368 | gtk_container_add(GTK_CONTAINER(icon->button), newchild); | |
369 | gtk_widget_show(newchild); | |
370 | } | |
7392b131 RK |
371 | /* If you disable play or random play NOT via the icon (for instance, via the |
372 | * edit menu or via a completely separate command line invocation) then the | |
00e0c652 | 373 | * icon shows up as insensitive. Hover the mouse over it and the correct |
7392b131 RK |
374 | * state is immediately displayed. sensitive and GTK_WIDGET_SENSITIVE show |
375 | * it to be in the correct state, so I think this is may be a GTK+ bug. */ | |
3849817f RK |
376 | if(icon->tip_on) |
377 | gtk_tooltips_set_tip(tips, icon->button, | |
378 | on ? icon->tip_on : icon->tip_off, ""); | |
379 | gtk_widget_set_sensitive(icon->button, sensitive); | |
380 | /* Icons with an associated menu item */ | |
ac6bf2ba | 381 | if(icon->item) { |
3849817f RK |
382 | if(icon->icon_off) |
383 | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), on); | |
384 | gtk_widget_set_sensitive(icon->item, sensitive); | |
ac6bf2ba | 385 | } |
3849817f | 386 | --suppress_actions; |
a99c4e9a RK |
387 | } |
388 | ||
53fa91bb | 389 | static void icon_action_completed(void attribute((unused)) *v, |
abf99697 RK |
390 | const char *err) { |
391 | if(err) | |
392 | popup_protocol_error(0, err); | |
53fa91bb RK |
393 | } |
394 | ||
460b9539 | 395 | static void clicked_icon(GtkButton attribute((unused)) *button, |
396 | gpointer userdata) { | |
397 | const struct icon *icon = userdata; | |
398 | ||
3849817f RK |
399 | if(suppress_actions) |
400 | return; | |
401 | if(!icon->on || icon->on()) | |
402 | icon->action_go_off(client, icon_action_completed, 0); | |
403 | else | |
404 | icon->action_go_on(client, icon_action_completed, 0); | |
460b9539 | 405 | } |
406 | ||
ac6bf2ba RK |
407 | static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem, |
408 | gpointer userdata) { | |
3849817f | 409 | clicked_icon(NULL, userdata); |
ac6bf2ba RK |
410 | } |
411 | ||
3849817f | 412 | static void toggled_menu(GtkCheckMenuItem attribute((unused)) *menuitem, |
2d504956 | 413 | gpointer userdata) { |
3849817f | 414 | clicked_icon(NULL, userdata); |
2d504956 RK |
415 | } |
416 | ||
699517af RK |
417 | /** @brief Called when a volume command completes */ |
418 | static void volume_completed(void attribute((unused)) *v, | |
abf99697 | 419 | const char *err, |
699517af RK |
420 | int attribute((unused)) l, |
421 | int attribute((unused)) r) { | |
abf99697 RK |
422 | if(err) |
423 | popup_protocol_error(0, err); | |
699517af RK |
424 | /* We don't set the UI's notion of the volume here, it is set from the log |
425 | * regardless of the reason it changed */ | |
426 | } | |
427 | ||
219dc95c | 428 | /** @brief Called when the volume has been adjusted */ |
460b9539 | 429 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
430 | gpointer attribute((unused)) user_data) { | |
431 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; | |
432 | double b = gtk_adjustment_get_value(balance_adj); | |
433 | ||
fb44b59e | 434 | if(suppress_actions) |
460b9539 | 435 | /* This is the result of an update from the server, not a change from the |
436 | * user. Don't feedback! */ | |
437 | return; | |
438 | D(("volume_adjusted")); | |
439 | /* force to 'stereotypical' values */ | |
440 | v = nearbyint(100 * v) / 100; | |
441 | b = nearbyint(5 * b) / 5; | |
442 | /* Set the volume. We don't want a reply, we'll get the actual new volume | |
443 | * from the log. */ | |
321f7536 RK |
444 | if(rtp_supported) { |
445 | int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100); | |
b50cfb8a RK |
446 | if(backend && backend->set_volume) |
447 | backend->set_volume(&l, &r); | |
321f7536 | 448 | } else |
699517af | 449 | disorder_eclient_volume(client, volume_completed, |
321f7536 RK |
450 | nearbyint(left(v, b) * 100), |
451 | nearbyint(right(v, b) * 100), | |
452 | 0); | |
460b9539 | 453 | } |
454 | ||
219dc95c | 455 | /** @brief Formats the volume value */ |
460b9539 | 456 | static gchar *format_volume(GtkScale attribute((unused)) *scale, |
457 | gdouble value) { | |
458 | char s[32]; | |
459 | ||
460 | snprintf(s, sizeof s, "%.1f", (double)value); | |
2fc4475d | 461 | return g_strdup(s); |
460b9539 | 462 | } |
463 | ||
219dc95c | 464 | /** @brief Formats the balance value */ |
460b9539 | 465 | static gchar *format_balance(GtkScale attribute((unused)) *scale, |
466 | gdouble value) { | |
467 | char s[32]; | |
468 | ||
469 | if(fabs(value) < 0.1) | |
2fc4475d | 470 | return g_strdup("0"); |
460b9539 | 471 | snprintf(s, sizeof s, "%+.1f", (double)value); |
2fc4475d | 472 | return g_strdup(s); |
460b9539 | 473 | } |
474 | ||
475 | /* Volume mapping. We consider left, right, volume to be in [0,1] | |
476 | * and balance to be in [-1,1]. | |
477 | * | |
478 | * First, we just have volume = max(left, right). | |
479 | * | |
480 | * Balance we consider to linearly represent the amount by which the quieter | |
481 | * channel differs from the louder. In detail: | |
482 | * | |
483 | * if right > left then balance > 0: | |
484 | * balance = 0 => left = right (as an endpoint, not an instance) | |
485 | * balance = 1 => left = 0 | |
486 | * fitting to linear, left = right * (1 - balance) | |
487 | * so balance = 1 - left / right | |
488 | * (right > left => right > 0 so no division by 0.) | |
489 | * | |
490 | * if left > right then balance < 0: | |
491 | * balance = 0 => right = left (same caveat as above) | |
492 | * balance = -1 => right = 0 | |
493 | * again fitting to linear, right = left * (1 + balance) | |
494 | * so balance = right / left - 1 | |
495 | * (left > right => left > 0 so no division by 0.) | |
496 | * | |
497 | * if left = right then we just have balance = 0. | |
498 | * | |
499 | * Thanks to Clive and Andrew. | |
500 | */ | |
501 | ||
219dc95c | 502 | /** @brief Return the greater of @p x and @p y */ |
460b9539 | 503 | static double max(double x, double y) { |
504 | return x > y ? x : y; | |
505 | } | |
506 | ||
219dc95c | 507 | /** @brief Compute the left channel volume */ |
460b9539 | 508 | static double left(double v, double b) { |
509 | if(b > 0) /* volume = right */ | |
510 | return v * (1 - b); | |
511 | else /* volume = left */ | |
512 | return v; | |
513 | } | |
514 | ||
219dc95c | 515 | /** @brief Compute the right channel volume */ |
460b9539 | 516 | static double right(double v, double b) { |
517 | if(b > 0) /* volume = right */ | |
518 | return v; | |
519 | else /* volume = left */ | |
520 | return v * (1 + b); | |
521 | } | |
522 | ||
219dc95c | 523 | /** @brief Compute the overall volume */ |
460b9539 | 524 | static double volume(double l, double r) { |
525 | return max(l, r); | |
526 | } | |
527 | ||
219dc95c | 528 | /** @brief Compute the balance */ |
460b9539 | 529 | static double balance(double l, double r) { |
530 | if(l > r) | |
531 | return r / l - 1; | |
532 | else if(r > l) | |
533 | return 1 - l / r; | |
534 | else /* left = right */ | |
535 | return 0; | |
536 | } | |
537 | ||
a99c4e9a RK |
538 | /** @brief Called to enable RTP play |
539 | * | |
540 | * Rather odd signature is to fit in with the other icons which all call @ref | |
541 | * lib/eclient.h functions. | |
542 | */ | |
543 | static int enable_rtp(disorder_eclient attribute((unused)) *c, | |
544 | disorder_eclient_no_response attribute((unused)) *completed, | |
545 | void attribute((unused)) *v) { | |
546 | start_rtp(); | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /** @brief Called to disable RTP play | |
551 | * | |
552 | * Rather odd signature is to fit in with the other icons which all call @ref | |
553 | * lib/eclient.h functions. | |
554 | */ | |
555 | static int disable_rtp(disorder_eclient attribute((unused)) *c, | |
556 | disorder_eclient_no_response attribute((unused)) *completed, | |
557 | void attribute((unused)) *v) { | |
558 | stop_rtp(); | |
559 | return 0; | |
560 | } | |
561 | ||
460b9539 | 562 | /* |
563 | Local Variables: | |
564 | c-basic-offset:2 | |
565 | comment-column:40 | |
566 | fill-column:79 | |
567 | indent-tabs-mode:nil | |
568 | End: | |
569 | */ |