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 | * |
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 | */ | |
219dc95c RK |
20 | /** @file disobedience/control.c |
21 | * @brief Volume control and buttons | |
22 | */ | |
460b9539 | 23 | |
24 | #include "disobedience.h" | |
321f7536 | 25 | #include "mixer.h" |
460b9539 | 26 | |
e9b70a84 | 27 | /* Forward declarations ---------------------------------------------------- */ |
28 | ||
29 | WT(adjustment); | |
30 | WT(hscale); | |
31 | WT(hbox); | |
e9b70a84 | 32 | WT(button); |
33 | WT(image); | |
34 | WT(label); | |
35 | WT(vbox); | |
460b9539 | 36 | |
37 | struct icon; | |
38 | ||
460b9539 | 39 | static void clicked_icon(GtkButton *, gpointer); |
ac6bf2ba | 40 | static void clicked_menu(GtkMenuItem *, gpointer userdata); |
2d504956 | 41 | static void toggled_menu(GtkCheckMenuItem *, gpointer userdata); |
460b9539 | 42 | |
a99c4e9a RK |
43 | static int enable_rtp(disorder_eclient *c, |
44 | disorder_eclient_no_response *completed, | |
45 | void *v); | |
46 | static int disable_rtp(disorder_eclient *c, | |
47 | disorder_eclient_no_response *completed, | |
48 | void *v); | |
49 | ||
460b9539 | 50 | static double left(double v, double b); |
51 | static double right(double v, double b); | |
52 | static double volume(double l, double r); | |
53 | static double balance(double l, double r); | |
54 | ||
55 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); | |
56 | static gchar *format_volume(GtkScale *scale, gdouble value); | |
57 | static gchar *format_balance(GtkScale *scale, gdouble value); | |
58 | ||
6856f665 RK |
59 | static void icon_changed(const char *event, |
60 | void *evendata, | |
61 | void *callbackdata); | |
1f868ca3 RK |
62 | static void volume_changed(const char *event, |
63 | void *eventdata, | |
64 | void *callbackdata); | |
65 | ||
460b9539 | 66 | /* Control bar ------------------------------------------------------------- */ |
67 | ||
fb44b59e RK |
68 | /** @brief Guard against feedback */ |
69 | int suppress_actions = 1; | |
460b9539 | 70 | |
219dc95c RK |
71 | /** @brief Definition of an icon |
72 | * | |
3849817f RK |
73 | * We have two kinds of icon: |
74 | * - action icons, which just do something but don't have a state as such | |
75 | * - toggle icons, which toggle between two states ("on" and "off"). | |
76 | * | |
77 | * The scratch button is an action icon; currently all the others are toggle | |
78 | * icons. | |
79 | * | |
80 | * (All icons can be sensitive or insensitive, separately to the above.) | |
219dc95c RK |
81 | */ |
82 | struct icon { | |
3849817f RK |
83 | /** @brief Filename for 'on' image */ |
84 | const char *icon_on; | |
85 | ||
86 | /** @brief Text for 'on' tooltip */ | |
87 | const char *tip_on; | |
219dc95c | 88 | |
3849817f RK |
89 | /** @brief Filename for 'off' image or NULL for an action icon */ |
90 | const char *icon_off; | |
91 | ||
92 | /** @brief Text for 'off tooltip */ | |
93 | const char *tip_off; | |
219dc95c | 94 | |
ac6bf2ba RK |
95 | /** @brief Associated menu item or NULL */ |
96 | const char *menuitem; | |
219dc95c | 97 | |
6856f665 RK |
98 | /** @brief Events that change this icon, separated by spaces */ |
99 | const char *events; | |
100 | ||
3849817f RK |
101 | /** @brief @ref eclient.h function to call to go from off to on |
102 | * | |
103 | * For action buttons, this should be NULL. | |
104 | */ | |
105 | int (*action_go_on)(disorder_eclient *c, | |
106 | disorder_eclient_no_response *completed, | |
107 | void *v); | |
219dc95c | 108 | |
3849817f RK |
109 | /** @brief @ref eclient.h function to call to go from on to off |
110 | * | |
111 | * For action buttons, this action is used. | |
112 | */ | |
113 | int (*action_go_off)(disorder_eclient *c, | |
114 | disorder_eclient_no_response *completed, | |
115 | void *v); | |
219dc95c | 116 | |
3849817f RK |
117 | /** @brief Get button state |
118 | * @return 1 for on, 0 for off | |
119 | */ | |
120 | int (*on)(void); | |
121 | ||
122 | /** @brief Get button sensitivity | |
123 | * @return 1 for sensitive, 0 for insensitive | |
124 | * | |
125 | * Can be NULL for always sensitive. | |
126 | */ | |
127 | int (*sensitive)(void); | |
2d504956 | 128 | |
219dc95c | 129 | /** @brief Pointer to button */ |
460b9539 | 130 | GtkWidget *button; |
ac6bf2ba RK |
131 | |
132 | /** @brief Pointer to menu item */ | |
133 | GtkWidget *item; | |
3849817f RK |
134 | |
135 | GtkWidget *image_on; | |
136 | GtkWidget *image_off; | |
219dc95c RK |
137 | }; |
138 | ||
3849817f RK |
139 | /* TODO: Add rights into the mix below */ |
140 | ||
141 | static int pause_resume_on(void) { | |
142 | return !(last_state & DISORDER_TRACK_PAUSED); | |
143 | } | |
144 | ||
145 | static int pause_resume_sensitive(void) { | |
6f09d54d RK |
146 | return !!(last_state & DISORDER_PLAYING) |
147 | && (last_rights & RIGHT_PAUSE); | |
3849817f RK |
148 | } |
149 | ||
150 | static int scratch_sensitive(void) { | |
6f09d54d | 151 | return !!(last_state & DISORDER_PLAYING) |
afe9f743 | 152 | && right_scratchable(last_rights, config->username, playing_track); |
6f09d54d RK |
153 | } |
154 | ||
155 | static int random_sensitive(void) { | |
156 | return !!(last_rights & RIGHT_GLOBAL_PREFS); | |
3849817f RK |
157 | } |
158 | ||
159 | static int random_enabled(void) { | |
160 | return !!(last_state & DISORDER_RANDOM_ENABLED); | |
161 | } | |
162 | ||
6f09d54d RK |
163 | static int playing_sensitive(void) { |
164 | return !!(last_rights & RIGHT_GLOBAL_PREFS); | |
165 | } | |
166 | ||
3849817f RK |
167 | static int playing_enabled(void) { |
168 | return !!(last_state & DISORDER_PLAYING_ENABLED); | |
169 | } | |
2d504956 | 170 | |
3849817f RK |
171 | static int rtp_enabled(void) { |
172 | return rtp_is_running; | |
173 | } | |
174 | ||
175 | static int rtp_sensitive(void) { | |
176 | return rtp_supported; | |
177 | } | |
2d504956 | 178 | |
219dc95c RK |
179 | /** @brief Table of all icons */ |
180 | static struct icon icons[] = { | |
2d504956 | 181 | { |
3849817f RK |
182 | icon_on: "pause.png", |
183 | tip_on: "Pause playing track", | |
184 | icon_off: "play.png", | |
185 | tip_off: "Resume playing track", | |
186 | menuitem: "<GdisorderMain>/Control/Playing", | |
187 | on: pause_resume_on, | |
188 | sensitive: pause_resume_sensitive, | |
189 | action_go_on: disorder_eclient_resume, | |
190 | action_go_off: disorder_eclient_pause, | |
6856f665 | 191 | events: "pause-changed playing-changed rights-changed", |
2d504956 RK |
192 | }, |
193 | { | |
3849817f RK |
194 | icon_on: "cross.png", |
195 | tip_on: "Cancel playing track", | |
196 | menuitem: "<GdisorderMain>/Control/Scratch", | |
197 | sensitive: scratch_sensitive, | |
198 | action_go_off: disorder_eclient_scratch_playing, | |
6856f665 | 199 | events: "playing-track-changed rights-changed", |
2d504956 RK |
200 | }, |
201 | { | |
3849817f RK |
202 | icon_on: "randomcross.png", |
203 | tip_on: "Disable random play", | |
204 | icon_off: "random.png", | |
205 | tip_off: "Enable random play", | |
206 | menuitem: "<GdisorderMain>/Control/Random play", | |
207 | on: random_enabled, | |
6f09d54d | 208 | sensitive: random_sensitive, |
3849817f RK |
209 | action_go_on: disorder_eclient_random_enable, |
210 | action_go_off: disorder_eclient_random_disable, | |
6856f665 | 211 | events: "random-changed rights-changed", |
2d504956 RK |
212 | }, |
213 | { | |
3849817f RK |
214 | icon_on: "notescross.png", |
215 | tip_on: "Disable play", | |
216 | icon_off: "notes.png", | |
217 | tip_off: "Enable play", | |
218 | on: playing_enabled, | |
6f09d54d | 219 | sensitive: playing_sensitive, |
3849817f RK |
220 | action_go_on: disorder_eclient_enable, |
221 | action_go_off: disorder_eclient_disable, | |
6856f665 | 222 | events: "enabled-changed rights-changed", |
2d504956 RK |
223 | }, |
224 | { | |
3849817f RK |
225 | icon_on: "speakercross.png", |
226 | tip_on: "Stop playing network stream", | |
227 | icon_off: "speaker.png", | |
228 | tip_off: "Play network stream", | |
229 | menuitem: "<GdisorderMain>/Control/Network player", | |
230 | on: rtp_enabled, | |
231 | sensitive: rtp_sensitive, | |
232 | action_go_on: enable_rtp, | |
6856f665 RK |
233 | action_go_off: disable_rtp, |
234 | events: "rtp-changed", | |
2d504956 | 235 | }, |
460b9539 | 236 | }; |
219dc95c RK |
237 | |
238 | /** @brief Count of icons */ | |
460b9539 | 239 | #define NICONS (int)(sizeof icons / sizeof *icons) |
240 | ||
219dc95c RK |
241 | static GtkAdjustment *volume_adj; |
242 | static GtkAdjustment *balance_adj; | |
3c499fe7 RK |
243 | static GtkWidget *volume_widget; |
244 | static GtkWidget *balance_widget; | |
460b9539 | 245 | |
219dc95c | 246 | /** @brief Create the control bar */ |
e9b70a84 | 247 | GtkWidget *control_widget(void) { |
460b9539 | 248 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
460b9539 | 249 | int n; |
250 | ||
e9b70a84 | 251 | NW(hbox); |
460b9539 | 252 | D(("control_widget")); |
ac6bf2ba | 253 | assert(mainmenufactory); /* ordering must be right */ |
460b9539 | 254 | for(n = 0; n < NICONS; ++n) { |
3849817f | 255 | /* Create the button */ |
e9b70a84 | 256 | NW(button); |
3849817f RK |
257 | icons[n].button = gtk_button_new(); |
258 | gtk_widget_set_style(icons[n].button, tool_style); | |
259 | icons[n].image_on = gtk_image_new_from_pixbuf(find_image(icons[n].icon_on)); | |
260 | gtk_widget_set_style(icons[n].image_on, tool_style); | |
261 | g_object_ref(icons[n].image_on); | |
262 | /* If it's a toggle icon, create the 'off' half too */ | |
263 | if(icons[n].icon_off) { | |
264 | icons[n].image_off = gtk_image_new_from_pixbuf(find_image(icons[n].icon_off)); | |
265 | gtk_widget_set_style(icons[n].image_off, tool_style); | |
266 | g_object_ref(icons[n].image_off); | |
267 | } | |
460b9539 | 268 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", |
ac6bf2ba | 269 | G_CALLBACK(clicked_icon), &icons[n]); |
460b9539 | 270 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
271 | * taller things in the control bar */ | |
e9b70a84 | 272 | NW(vbox); |
460b9539 | 273 | vbox = gtk_vbox_new(FALSE, 0); |
274 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); | |
275 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); | |
ac6bf2ba | 276 | if(icons[n].menuitem) { |
3849817f | 277 | /* Find the menu item */ |
ac6bf2ba RK |
278 | icons[n].item = gtk_item_factory_get_widget(mainmenufactory, |
279 | icons[n].menuitem); | |
3849817f | 280 | if(icons[n].icon_off) |
2d504956 RK |
281 | g_signal_connect(G_OBJECT(icons[n].item), "toggled", |
282 | G_CALLBACK(toggled_menu), &icons[n]); | |
3849817f | 283 | else |
2d504956 RK |
284 | g_signal_connect(G_OBJECT(icons[n].item), "activate", |
285 | G_CALLBACK(clicked_menu), &icons[n]); | |
ac6bf2ba | 286 | } |
6856f665 RK |
287 | /* Make sure the icon is updated when relevant things changed */ |
288 | char **events = split(icons[n].events, 0, 0, 0, 0); | |
289 | while(*events) | |
290 | event_register(*events++, icon_changed, &icons[n]); | |
460b9539 | 291 | } |
292 | /* create the adjustments for the volume control */ | |
e9b70a84 | 293 | NW(adjustment); |
460b9539 | 294 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, |
295 | goesupto / 20, goesupto / 20, | |
296 | 0)); | |
e9b70a84 | 297 | NW(adjustment); |
460b9539 | 298 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, |
299 | 0.2, 0.2, 0)); | |
300 | /* the volume control */ | |
e9b70a84 | 301 | NW(hscale); |
3c499fe7 | 302 | volume_widget = gtk_hscale_new(volume_adj); |
e9b70a84 | 303 | NW(hscale); |
3c499fe7 RK |
304 | balance_widget = gtk_hscale_new(balance_adj); |
305 | gtk_widget_set_style(volume_widget, tool_style); | |
306 | gtk_widget_set_style(balance_widget, tool_style); | |
307 | gtk_scale_set_digits(GTK_SCALE(volume_widget), 10); | |
308 | gtk_scale_set_digits(GTK_SCALE(balance_widget), 10); | |
309 | gtk_widget_set_size_request(volume_widget, 192, -1); | |
310 | gtk_widget_set_size_request(balance_widget, 192, -1); | |
311 | gtk_tooltips_set_tip(tips, volume_widget, "Volume", ""); | |
312 | gtk_tooltips_set_tip(tips, balance_widget, "Balance", ""); | |
313 | gtk_box_pack_start(GTK_BOX(hbox), volume_widget, FALSE, TRUE, 0); | |
314 | gtk_box_pack_start(GTK_BOX(hbox), balance_widget, FALSE, TRUE, 0); | |
460b9539 | 315 | /* space updates rather than hammering the server */ |
3c499fe7 RK |
316 | gtk_range_set_update_policy(GTK_RANGE(volume_widget), GTK_UPDATE_DELAYED); |
317 | gtk_range_set_update_policy(GTK_RANGE(balance_widget), GTK_UPDATE_DELAYED); | |
460b9539 | 318 | /* notice when the adjustments are changed */ |
319 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", | |
320 | G_CALLBACK(volume_adjusted), 0); | |
321 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", | |
322 | G_CALLBACK(volume_adjusted), 0); | |
323 | /* format the volume/balance values ourselves */ | |
3c499fe7 | 324 | g_signal_connect(G_OBJECT(volume_widget), "format-value", |
460b9539 | 325 | G_CALLBACK(format_volume), 0); |
3c499fe7 | 326 | g_signal_connect(G_OBJECT(balance_widget), "format-value", |
460b9539 | 327 | G_CALLBACK(format_balance), 0); |
1f868ca3 | 328 | event_register("volume-changed", volume_changed, 0); |
6856f665 | 329 | event_register("rtp-changed", volume_changed, 0); |
460b9539 | 330 | return hbox; |
331 | } | |
332 | ||
6d1302f0 | 333 | /** @brief Update the volume control when it changes */ |
1f868ca3 RK |
334 | static void volume_changed(const char attribute((unused)) *event, |
335 | void attribute((unused)) *eventdata, | |
336 | void attribute((unused)) *callbackdata) { | |
460b9539 | 337 | double l, r; |
6856f665 | 338 | gboolean volume_supported; |
460b9539 | 339 | |
1f868ca3 | 340 | D(("volume_changed")); |
fb44b59e | 341 | ++suppress_actions; |
6856f665 RK |
342 | /* Only display volume/balance controls if they will work */ |
343 | if(!rtp_supported | |
344 | || (rtp_supported && mixer_supported(DEFAULT_BACKEND))) | |
345 | volume_supported = TRUE; | |
346 | else | |
347 | volume_supported = FALSE; | |
348 | /* TODO: if the server doesn't know how to set the volume [but isn't using | |
349 | * network play] then we should have volume_supported = FALSE */ | |
350 | if(volume_supported) { | |
351 | gtk_widget_show(volume_widget); | |
352 | gtk_widget_show(balance_widget); | |
353 | l = volume_l / 100.0; | |
354 | r = volume_r / 100.0; | |
355 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); | |
356 | gtk_adjustment_set_value(balance_adj, balance(l, r)); | |
357 | } else { | |
358 | gtk_widget_hide(volume_widget); | |
359 | gtk_widget_hide(balance_widget); | |
360 | } | |
fb44b59e | 361 | --suppress_actions; |
460b9539 | 362 | } |
363 | ||
ad58ebcc | 364 | /** @brief Update the state of one of the control icons |
ad58ebcc | 365 | */ |
6856f665 RK |
366 | static void icon_changed(const char attribute((unused)) *event, |
367 | void attribute((unused)) *evendata, | |
368 | void *callbackdata) { | |
369 | const struct icon *const icon = callbackdata; | |
3849817f RK |
370 | int on = icon->on ? icon->on() : 1; |
371 | int sensitive = icon->sensitive ? icon->sensitive() : 1; | |
372 | GtkWidget *child, *newchild; | |
373 | ||
374 | ++suppress_actions; | |
ad58ebcc | 375 | /* If the connection is down nothing is ever usable */ |
00959300 | 376 | if(!(last_state & DISORDER_CONNECTED)) |
3849817f RK |
377 | sensitive = 0; |
378 | /* Replace the child */ | |
379 | newchild = on ? icon->image_on : icon->image_off; | |
380 | child = gtk_bin_get_child(GTK_BIN(icon->button)); | |
381 | if(child != newchild) { | |
382 | if(child) | |
383 | gtk_container_remove(GTK_CONTAINER(icon->button), child); | |
384 | gtk_container_add(GTK_CONTAINER(icon->button), newchild); | |
385 | gtk_widget_show(newchild); | |
386 | } | |
387 | if(icon->tip_on) | |
388 | gtk_tooltips_set_tip(tips, icon->button, | |
389 | on ? icon->tip_on : icon->tip_off, ""); | |
390 | gtk_widget_set_sensitive(icon->button, sensitive); | |
391 | /* Icons with an associated menu item */ | |
ac6bf2ba | 392 | if(icon->item) { |
3849817f RK |
393 | if(icon->icon_off) |
394 | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), on); | |
395 | gtk_widget_set_sensitive(icon->item, sensitive); | |
ac6bf2ba | 396 | } |
3849817f | 397 | --suppress_actions; |
a99c4e9a RK |
398 | } |
399 | ||
53fa91bb RK |
400 | static void icon_action_completed(void attribute((unused)) *v, |
401 | const char *error) { | |
402 | if(error) | |
403 | popup_protocol_error(0, error); | |
404 | } | |
405 | ||
460b9539 | 406 | static void clicked_icon(GtkButton attribute((unused)) *button, |
407 | gpointer userdata) { | |
408 | const struct icon *icon = userdata; | |
409 | ||
3849817f RK |
410 | if(suppress_actions) |
411 | return; | |
412 | if(!icon->on || icon->on()) | |
413 | icon->action_go_off(client, icon_action_completed, 0); | |
414 | else | |
415 | icon->action_go_on(client, icon_action_completed, 0); | |
460b9539 | 416 | } |
417 | ||
ac6bf2ba RK |
418 | static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem, |
419 | gpointer userdata) { | |
3849817f | 420 | clicked_icon(NULL, userdata); |
ac6bf2ba RK |
421 | } |
422 | ||
3849817f | 423 | static void toggled_menu(GtkCheckMenuItem attribute((unused)) *menuitem, |
2d504956 | 424 | gpointer userdata) { |
3849817f | 425 | clicked_icon(NULL, userdata); |
2d504956 RK |
426 | } |
427 | ||
699517af RK |
428 | /** @brief Called when a volume command completes */ |
429 | static void volume_completed(void attribute((unused)) *v, | |
430 | const char *error, | |
431 | int attribute((unused)) l, | |
432 | int attribute((unused)) r) { | |
433 | if(error) | |
434 | popup_protocol_error(0, error); | |
435 | /* We don't set the UI's notion of the volume here, it is set from the log | |
436 | * regardless of the reason it changed */ | |
437 | } | |
438 | ||
219dc95c | 439 | /** @brief Called when the volume has been adjusted */ |
460b9539 | 440 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
441 | gpointer attribute((unused)) user_data) { | |
442 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; | |
443 | double b = gtk_adjustment_get_value(balance_adj); | |
444 | ||
fb44b59e | 445 | if(suppress_actions) |
460b9539 | 446 | /* This is the result of an update from the server, not a change from the |
447 | * user. Don't feedback! */ | |
448 | return; | |
449 | D(("volume_adjusted")); | |
450 | /* force to 'stereotypical' values */ | |
451 | v = nearbyint(100 * v) / 100; | |
452 | b = nearbyint(5 * b) / 5; | |
453 | /* Set the volume. We don't want a reply, we'll get the actual new volume | |
454 | * from the log. */ | |
321f7536 RK |
455 | if(rtp_supported) { |
456 | int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100); | |
3c499fe7 | 457 | mixer_control(DEFAULT_BACKEND, &l, &r, 1); |
321f7536 | 458 | } else |
699517af | 459 | disorder_eclient_volume(client, volume_completed, |
321f7536 RK |
460 | nearbyint(left(v, b) * 100), |
461 | nearbyint(right(v, b) * 100), | |
462 | 0); | |
460b9539 | 463 | } |
464 | ||
219dc95c | 465 | /** @brief Formats the volume value */ |
460b9539 | 466 | static gchar *format_volume(GtkScale attribute((unused)) *scale, |
467 | gdouble value) { | |
468 | char s[32]; | |
469 | ||
470 | snprintf(s, sizeof s, "%.1f", (double)value); | |
2fc4475d | 471 | return g_strdup(s); |
460b9539 | 472 | } |
473 | ||
219dc95c | 474 | /** @brief Formats the balance value */ |
460b9539 | 475 | static gchar *format_balance(GtkScale attribute((unused)) *scale, |
476 | gdouble value) { | |
477 | char s[32]; | |
478 | ||
479 | if(fabs(value) < 0.1) | |
2fc4475d | 480 | return g_strdup("0"); |
460b9539 | 481 | snprintf(s, sizeof s, "%+.1f", (double)value); |
2fc4475d | 482 | return g_strdup(s); |
460b9539 | 483 | } |
484 | ||
485 | /* Volume mapping. We consider left, right, volume to be in [0,1] | |
486 | * and balance to be in [-1,1]. | |
487 | * | |
488 | * First, we just have volume = max(left, right). | |
489 | * | |
490 | * Balance we consider to linearly represent the amount by which the quieter | |
491 | * channel differs from the louder. In detail: | |
492 | * | |
493 | * if right > left then balance > 0: | |
494 | * balance = 0 => left = right (as an endpoint, not an instance) | |
495 | * balance = 1 => left = 0 | |
496 | * fitting to linear, left = right * (1 - balance) | |
497 | * so balance = 1 - left / right | |
498 | * (right > left => right > 0 so no division by 0.) | |
499 | * | |
500 | * if left > right then balance < 0: | |
501 | * balance = 0 => right = left (same caveat as above) | |
502 | * balance = -1 => right = 0 | |
503 | * again fitting to linear, right = left * (1 + balance) | |
504 | * so balance = right / left - 1 | |
505 | * (left > right => left > 0 so no division by 0.) | |
506 | * | |
507 | * if left = right then we just have balance = 0. | |
508 | * | |
509 | * Thanks to Clive and Andrew. | |
510 | */ | |
511 | ||
219dc95c | 512 | /** @brief Return the greater of @p x and @p y */ |
460b9539 | 513 | static double max(double x, double y) { |
514 | return x > y ? x : y; | |
515 | } | |
516 | ||
219dc95c | 517 | /** @brief Compute the left channel volume */ |
460b9539 | 518 | static double left(double v, double b) { |
519 | if(b > 0) /* volume = right */ | |
520 | return v * (1 - b); | |
521 | else /* volume = left */ | |
522 | return v; | |
523 | } | |
524 | ||
219dc95c | 525 | /** @brief Compute the right channel volume */ |
460b9539 | 526 | static double right(double v, double b) { |
527 | if(b > 0) /* volume = right */ | |
528 | return v; | |
529 | else /* volume = left */ | |
530 | return v * (1 + b); | |
531 | } | |
532 | ||
219dc95c | 533 | /** @brief Compute the overall volume */ |
460b9539 | 534 | static double volume(double l, double r) { |
535 | return max(l, r); | |
536 | } | |
537 | ||
219dc95c | 538 | /** @brief Compute the balance */ |
460b9539 | 539 | static double balance(double l, double r) { |
540 | if(l > r) | |
541 | return r / l - 1; | |
542 | else if(r > l) | |
543 | return 1 - l / r; | |
544 | else /* left = right */ | |
545 | return 0; | |
546 | } | |
547 | ||
a99c4e9a RK |
548 | /** @brief Called to enable RTP play |
549 | * | |
550 | * Rather odd signature is to fit in with the other icons which all call @ref | |
551 | * lib/eclient.h functions. | |
552 | */ | |
553 | static int enable_rtp(disorder_eclient attribute((unused)) *c, | |
554 | disorder_eclient_no_response attribute((unused)) *completed, | |
555 | void attribute((unused)) *v) { | |
556 | start_rtp(); | |
557 | return 0; | |
558 | } | |
559 | ||
560 | /** @brief Called to disable RTP play | |
561 | * | |
562 | * Rather odd signature is to fit in with the other icons which all call @ref | |
563 | * lib/eclient.h functions. | |
564 | */ | |
565 | static int disable_rtp(disorder_eclient attribute((unused)) *c, | |
566 | disorder_eclient_no_response attribute((unused)) *completed, | |
567 | void attribute((unused)) *v) { | |
568 | stop_rtp(); | |
569 | return 0; | |
570 | } | |
571 | ||
460b9539 | 572 | /* |
573 | Local Variables: | |
574 | c-basic-offset:2 | |
575 | comment-column:40 | |
576 | fill-column:79 | |
577 | indent-tabs-mode:nil | |
578 | End: | |
579 | */ |