Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
eb525fcd | 3 | * Copyright (C) 2006, 2007 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 | ||
39 | static void update_pause(const struct icon *); | |
40 | static void update_play(const struct icon *); | |
41 | static void update_scratch(const struct icon *); | |
42 | static void update_random_enable(const struct icon *); | |
43 | static void update_random_disable(const struct icon *); | |
44 | static void update_enable(const struct icon *); | |
45 | static void update_disable(const struct icon *); | |
a99c4e9a RK |
46 | static void update_rtp(const struct icon *); |
47 | static void update_nortp(const struct icon *); | |
460b9539 | 48 | static void clicked_icon(GtkButton *, gpointer); |
ac6bf2ba | 49 | static void clicked_menu(GtkMenuItem *, gpointer userdata); |
2d504956 | 50 | static void toggled_menu(GtkCheckMenuItem *, gpointer userdata); |
460b9539 | 51 | |
a99c4e9a RK |
52 | static int enable_rtp(disorder_eclient *c, |
53 | disorder_eclient_no_response *completed, | |
54 | void *v); | |
55 | static int disable_rtp(disorder_eclient *c, | |
56 | disorder_eclient_no_response *completed, | |
57 | void *v); | |
58 | ||
460b9539 | 59 | static double left(double v, double b); |
60 | static double right(double v, double b); | |
61 | static double volume(double l, double r); | |
62 | static double balance(double l, double r); | |
63 | ||
64 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); | |
65 | static gchar *format_volume(GtkScale *scale, gdouble value); | |
66 | static gchar *format_balance(GtkScale *scale, gdouble value); | |
67 | ||
68 | /* Control bar ------------------------------------------------------------- */ | |
69 | ||
fb44b59e RK |
70 | /** @brief Guard against feedback */ |
71 | int suppress_actions = 1; | |
460b9539 | 72 | |
219dc95c RK |
73 | /** @brief Definition of an icon |
74 | * | |
75 | * The design here is rather mad: rather than changing the image displayed by | |
76 | * icons according to their state, we flip the visibility of pairs of icons. | |
77 | */ | |
78 | struct icon { | |
79 | /** @brief Filename for image */ | |
460b9539 | 80 | const char *icon; |
219dc95c RK |
81 | |
82 | /** @brief Text for tooltip */ | |
460b9539 | 83 | const char *tip; |
219dc95c | 84 | |
ac6bf2ba RK |
85 | /** @brief Associated menu item or NULL */ |
86 | const char *menuitem; | |
219dc95c RK |
87 | |
88 | /** @brief Called to update button when state may have changed */ | |
460b9539 | 89 | void (*update)(const struct icon *i); |
219dc95c RK |
90 | |
91 | /** @brief @ref eclient.h function to call */ | |
460b9539 | 92 | int (*action)(disorder_eclient *c, |
93 | disorder_eclient_no_response *completed, | |
94 | void *v); | |
219dc95c | 95 | |
2d504956 RK |
96 | /** @brief Flag */ |
97 | unsigned flags; | |
98 | ||
219dc95c | 99 | /** @brief Pointer to button */ |
460b9539 | 100 | GtkWidget *button; |
ac6bf2ba RK |
101 | |
102 | /** @brief Pointer to menu item */ | |
103 | GtkWidget *item; | |
219dc95c RK |
104 | }; |
105 | ||
2d504956 RK |
106 | /** @brief This is the active half of a pair */ |
107 | #define ICON_ACTIVE 0x0001 | |
108 | ||
109 | /** @brief This is the inactive half of a pair */ | |
110 | #define ICON_INACTIVE 0x0002 | |
111 | ||
219dc95c RK |
112 | /** @brief Table of all icons */ |
113 | static struct icon icons[] = { | |
2d504956 RK |
114 | { |
115 | "pause.png", /* icon */ | |
116 | "Pause playing track", /* tip */ | |
685bdfbd | 117 | "<GdisorderMain>/Control/Playing", /* menuitem */ |
2d504956 RK |
118 | update_pause, /* update */ |
119 | disorder_eclient_pause, /* action */ | |
685bdfbd | 120 | ICON_ACTIVE, /* flags */ |
2d504956 RK |
121 | 0, /* button */ |
122 | 0 /* item */ | |
123 | }, | |
124 | { | |
125 | "play.png", /* icon */ | |
126 | "Resume playing track", /* tip */ | |
685bdfbd | 127 | "<GdisorderMain>/Control/Playing", /* menuitem */ |
2d504956 RK |
128 | update_play, /* update */ |
129 | disorder_eclient_resume, /* action */ | |
685bdfbd | 130 | ICON_INACTIVE, /* flags */ |
2d504956 RK |
131 | 0, /* button */ |
132 | 0 /* item */ | |
133 | }, | |
134 | { | |
135 | "cross.png", /* icon */ | |
136 | "Cancel playing track", /* tip */ | |
137 | "<GdisorderMain>/Control/Scratch", /* menuitem */ | |
138 | update_scratch, /* update */ | |
139 | disorder_eclient_scratch_playing, /* action */ | |
140 | 0, /* flags */ | |
141 | 0, /* button */ | |
142 | 0 /* item */ | |
143 | }, | |
144 | { | |
145 | "random.png", /* icon */ | |
146 | "Enable random play", /* tip */ | |
147 | "<GdisorderMain>/Control/Random play", /* menuitem */ | |
148 | update_random_enable, /* update */ | |
149 | disorder_eclient_random_enable, /* action */ | |
150 | ICON_INACTIVE, /* flags */ | |
151 | 0, /* button */ | |
152 | 0 /* item */ | |
153 | }, | |
154 | { | |
155 | "randomcross.png", /* icon */ | |
156 | "Disable random play", /* tip */ | |
157 | "<GdisorderMain>/Control/Random play", /* menuitem */ | |
158 | update_random_disable, /* update */ | |
159 | disorder_eclient_random_disable, /* action */ | |
160 | ICON_ACTIVE, /* flags */ | |
161 | 0, /* button */ | |
162 | 0 /* item */ | |
163 | }, | |
164 | { | |
165 | "notes.png", /* icon */ | |
166 | "Enable play", /* tip */ | |
167 | 0, /* menuitem */ | |
168 | update_enable, /* update */ | |
169 | disorder_eclient_enable, /* action */ | |
170 | ICON_INACTIVE, /* flags */ | |
171 | 0, /* button */ | |
172 | 0 /* item */ | |
173 | }, | |
174 | { | |
175 | "notescross.png", /* icon */ | |
176 | "Disable play", /* tip */ | |
177 | 0, /* menuitem */ | |
178 | update_disable, /* update */ | |
179 | disorder_eclient_disable, /* action */ | |
180 | ICON_ACTIVE, /* flags */ | |
181 | 0, /* button */ | |
182 | 0 /* item */ | |
183 | }, | |
184 | { | |
185 | "speaker.png", /* icon */ | |
186 | "Play network stream", /* tip */ | |
685bdfbd | 187 | "<GdisorderMain>/Control/Network player", /* menuitem */ |
2d504956 RK |
188 | update_rtp, /* update */ |
189 | enable_rtp, /* action */ | |
190 | ICON_INACTIVE, /* flags */ | |
191 | 0, /* button */ | |
192 | 0 /* item */ | |
193 | }, | |
194 | { | |
195 | "speakercross.png", /* icon */ | |
196 | "Stop playing network stream", /* tip */ | |
685bdfbd | 197 | "<GdisorderMain>/Control/Network player", /* menuitem */ |
2d504956 RK |
198 | update_nortp, /* update */ |
199 | disable_rtp, /* action */ | |
200 | ICON_ACTIVE, /* flags */ | |
201 | 0, /* button */ | |
202 | 0 /* item */ | |
203 | }, | |
460b9539 | 204 | }; |
219dc95c RK |
205 | |
206 | /** @brief Count of icons */ | |
460b9539 | 207 | #define NICONS (int)(sizeof icons / sizeof *icons) |
208 | ||
219dc95c RK |
209 | static GtkAdjustment *volume_adj; |
210 | static GtkAdjustment *balance_adj; | |
460b9539 | 211 | |
6d1302f0 | 212 | /** @brief Called whenever last_state changes in any way */ |
a99c4e9a | 213 | void control_monitor(void attribute((unused)) *u) { |
6d1302f0 RK |
214 | int n; |
215 | ||
216 | D(("control_monitor")); | |
217 | for(n = 0; n < NICONS; ++n) | |
218 | icons[n].update(&icons[n]); | |
219 | } | |
220 | ||
219dc95c | 221 | /** @brief Create the control bar */ |
e9b70a84 | 222 | GtkWidget *control_widget(void) { |
460b9539 | 223 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
460b9539 | 224 | GtkWidget *v, *b; |
460b9539 | 225 | int n; |
226 | ||
e9b70a84 | 227 | NW(hbox); |
460b9539 | 228 | D(("control_widget")); |
ac6bf2ba | 229 | assert(mainmenufactory); /* ordering must be right */ |
460b9539 | 230 | for(n = 0; n < NICONS; ++n) { |
e9b70a84 | 231 | NW(button); |
33288048 | 232 | icons[n].button = iconbutton(icons[n].icon, icons[n].tip); |
460b9539 | 233 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", |
ac6bf2ba | 234 | G_CALLBACK(clicked_icon), &icons[n]); |
460b9539 | 235 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
236 | * taller things in the control bar */ | |
e9b70a84 | 237 | NW(vbox); |
460b9539 | 238 | vbox = gtk_vbox_new(FALSE, 0); |
239 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); | |
240 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); | |
ac6bf2ba RK |
241 | if(icons[n].menuitem) { |
242 | icons[n].item = gtk_item_factory_get_widget(mainmenufactory, | |
243 | icons[n].menuitem); | |
2d504956 RK |
244 | switch(icons[n].flags & (ICON_ACTIVE|ICON_INACTIVE)) { |
245 | case ICON_ACTIVE: | |
246 | g_signal_connect(G_OBJECT(icons[n].item), "toggled", | |
247 | G_CALLBACK(toggled_menu), &icons[n]); | |
248 | break; | |
249 | case ICON_INACTIVE: | |
250 | /* Don't connect two instances of the signal! */ | |
251 | break; | |
252 | default: | |
253 | g_signal_connect(G_OBJECT(icons[n].item), "activate", | |
254 | G_CALLBACK(clicked_menu), &icons[n]); | |
255 | break; | |
256 | } | |
ac6bf2ba | 257 | } |
460b9539 | 258 | } |
259 | /* create the adjustments for the volume control */ | |
e9b70a84 | 260 | NW(adjustment); |
460b9539 | 261 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, |
262 | goesupto / 20, goesupto / 20, | |
263 | 0)); | |
e9b70a84 | 264 | NW(adjustment); |
460b9539 | 265 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, |
266 | 0.2, 0.2, 0)); | |
267 | /* the volume control */ | |
e9b70a84 | 268 | NW(hscale); |
460b9539 | 269 | v = gtk_hscale_new(volume_adj); |
e9b70a84 | 270 | NW(hscale); |
460b9539 | 271 | b = gtk_hscale_new(balance_adj); |
33288048 RK |
272 | gtk_widget_set_style(v, tool_style); |
273 | gtk_widget_set_style(b, tool_style); | |
460b9539 | 274 | gtk_scale_set_digits(GTK_SCALE(v), 10); |
275 | gtk_scale_set_digits(GTK_SCALE(b), 10); | |
276 | gtk_widget_set_size_request(v, 192, -1); | |
277 | gtk_widget_set_size_request(b, 192, -1); | |
278 | gtk_tooltips_set_tip(tips, v, "Volume", ""); | |
279 | gtk_tooltips_set_tip(tips, b, "Balance", ""); | |
280 | gtk_box_pack_start(GTK_BOX(hbox), v, FALSE, TRUE, 0); | |
281 | gtk_box_pack_start(GTK_BOX(hbox), b, FALSE, TRUE, 0); | |
282 | /* space updates rather than hammering the server */ | |
283 | gtk_range_set_update_policy(GTK_RANGE(v), GTK_UPDATE_DELAYED); | |
284 | gtk_range_set_update_policy(GTK_RANGE(b), GTK_UPDATE_DELAYED); | |
285 | /* notice when the adjustments are changed */ | |
286 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", | |
287 | G_CALLBACK(volume_adjusted), 0); | |
288 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", | |
289 | G_CALLBACK(volume_adjusted), 0); | |
290 | /* format the volume/balance values ourselves */ | |
291 | g_signal_connect(G_OBJECT(v), "format-value", | |
292 | G_CALLBACK(format_volume), 0); | |
293 | g_signal_connect(G_OBJECT(b), "format-value", | |
294 | G_CALLBACK(format_balance), 0); | |
00959300 | 295 | register_monitor(control_monitor, 0, -1UL); |
460b9539 | 296 | return hbox; |
297 | } | |
298 | ||
6d1302f0 RK |
299 | /** @brief Update the volume control when it changes */ |
300 | void volume_update(void) { | |
460b9539 | 301 | double l, r; |
302 | ||
6d1302f0 | 303 | D(("volume_update")); |
460b9539 | 304 | l = volume_l / 100.0; |
305 | r = volume_r / 100.0; | |
fb44b59e | 306 | ++suppress_actions; |
460b9539 | 307 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); |
308 | gtk_adjustment_set_value(balance_adj, balance(l, r)); | |
fb44b59e | 309 | --suppress_actions; |
460b9539 | 310 | } |
311 | ||
ad58ebcc | 312 | /** @brief Update the state of one of the control icons |
00959300 | 313 | * @param icon Target icon |
ad58ebcc | 314 | * @param visible True if this version of the button should be visible |
315 | * @param usable True if the button is currently usable | |
316 | * | |
317 | * Several of the icons, rather bizarrely, come in pairs: for instance exactly | |
318 | * one of the play and pause buttons is supposed to be visible at any given | |
319 | * moment. | |
320 | * | |
321 | * @p usable need not take into account server availability, that is done | |
322 | * automatically. | |
323 | */ | |
00959300 | 324 | static void update_icon(const struct icon *icon, |
ad58ebcc | 325 | int visible, int usable) { |
326 | /* If the connection is down nothing is ever usable */ | |
00959300 | 327 | if(!(last_state & DISORDER_CONNECTED)) |
ad58ebcc | 328 | usable = 0; |
00959300 | 329 | (visible ? gtk_widget_show : gtk_widget_hide)(icon->button); |
ad58ebcc | 330 | /* Only both updating usability if the button is visible */ |
331 | if(visible) | |
00959300 | 332 | gtk_widget_set_sensitive(icon->button, usable); |
ac6bf2ba | 333 | if(icon->item) { |
2d504956 RK |
334 | /* There's an associated menu item. These are always visible, but may not |
335 | * be usable. */ | |
336 | if((icon->flags & (ICON_ACTIVE|ICON_INACTIVE)) == ICON_ACTIVE) { | |
337 | /* The active half of a pair */ | |
338 | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), visible); | |
339 | } | |
340 | gtk_widget_set_sensitive(icon->item, usable); | |
ac6bf2ba | 341 | } |
460b9539 | 342 | } |
343 | ||
344 | static void update_pause(const struct icon *icon) { | |
00959300 RK |
345 | const int visible = !(last_state & DISORDER_TRACK_PAUSED); |
346 | const int usable = !!(last_state & DISORDER_PLAYING); /* TODO: might be a lie */ | |
347 | update_icon(icon, visible, usable); | |
460b9539 | 348 | } |
349 | ||
350 | static void update_play(const struct icon *icon) { | |
00959300 RK |
351 | const int visible = !!(last_state & DISORDER_TRACK_PAUSED); |
352 | const int usable = !!(last_state & DISORDER_PLAYING); | |
353 | update_icon(icon, visible, usable); | |
460b9539 | 354 | } |
355 | ||
356 | static void update_scratch(const struct icon *icon) { | |
00959300 RK |
357 | const int visible = 1; |
358 | const int usable = !!(last_state & DISORDER_PLAYING); | |
359 | update_icon(icon, visible, usable); | |
460b9539 | 360 | } |
361 | ||
362 | static void update_random_enable(const struct icon *icon) { | |
00959300 RK |
363 | const int visible = !(last_state & DISORDER_RANDOM_ENABLED); |
364 | const int usable = 1; | |
365 | update_icon(icon, visible, usable); | |
460b9539 | 366 | } |
367 | ||
368 | static void update_random_disable(const struct icon *icon) { | |
00959300 RK |
369 | const int visible = !!(last_state & DISORDER_RANDOM_ENABLED); |
370 | const int usable = 1; | |
371 | update_icon(icon, visible, usable); | |
460b9539 | 372 | } |
373 | ||
374 | static void update_enable(const struct icon *icon) { | |
00959300 RK |
375 | const int visible = !(last_state & DISORDER_PLAYING_ENABLED); |
376 | const int usable = 1; | |
377 | update_icon(icon, visible, usable); | |
460b9539 | 378 | } |
379 | ||
380 | static void update_disable(const struct icon *icon) { | |
00959300 RK |
381 | const int visible = !!(last_state & DISORDER_PLAYING_ENABLED); |
382 | const int usable = 1; | |
383 | update_icon(icon, visible, usable); | |
460b9539 | 384 | } |
385 | ||
a99c4e9a RK |
386 | static void update_rtp(const struct icon *icon) { |
387 | const int visible = !rtp_is_running; | |
388 | const int usable = rtp_supported; | |
389 | update_icon(icon, visible, usable); | |
390 | } | |
391 | ||
392 | static void update_nortp(const struct icon *icon) { | |
393 | const int visible = rtp_is_running; | |
394 | const int usable = rtp_supported; | |
395 | update_icon(icon, visible, usable); | |
396 | } | |
397 | ||
460b9539 | 398 | static void clicked_icon(GtkButton attribute((unused)) *button, |
399 | gpointer userdata) { | |
400 | const struct icon *icon = userdata; | |
401 | ||
fb44b59e RK |
402 | if(!suppress_actions) |
403 | icon->action(client, 0, 0); | |
460b9539 | 404 | } |
405 | ||
ac6bf2ba RK |
406 | static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem, |
407 | gpointer userdata) { | |
408 | const struct icon *icon = userdata; | |
409 | ||
fb44b59e RK |
410 | if(!suppress_actions) |
411 | icon->action(client, 0, 0); | |
ac6bf2ba RK |
412 | } |
413 | ||
2d504956 RK |
414 | static void toggled_menu(GtkCheckMenuItem *menuitem, |
415 | gpointer userdata) { | |
416 | const struct icon *icon = userdata; | |
417 | size_t n; | |
418 | ||
fb44b59e RK |
419 | if(suppress_actions) |
420 | return; | |
2d504956 RK |
421 | /* This is a bit fiddlier than the others, we need to find the action for the |
422 | * new state. If the new state is active then we want the ICON_INACTIVE | |
423 | * version and vica versa. */ | |
424 | for(n = 0; n < NICONS; ++n) | |
425 | if(icons[n].item == icon->item | |
426 | && !!(icons[n].flags & ICON_INACTIVE) == !!menuitem->active) | |
427 | break; | |
428 | if(n < NICONS) | |
429 | icons[n].action(client, 0, 0); | |
430 | } | |
431 | ||
219dc95c | 432 | /** @brief Called when the volume has been adjusted */ |
460b9539 | 433 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
434 | gpointer attribute((unused)) user_data) { | |
435 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; | |
436 | double b = gtk_adjustment_get_value(balance_adj); | |
437 | ||
fb44b59e | 438 | if(suppress_actions) |
460b9539 | 439 | /* This is the result of an update from the server, not a change from the |
440 | * user. Don't feedback! */ | |
441 | return; | |
442 | D(("volume_adjusted")); | |
443 | /* force to 'stereotypical' values */ | |
444 | v = nearbyint(100 * v) / 100; | |
445 | b = nearbyint(5 * b) / 5; | |
446 | /* Set the volume. We don't want a reply, we'll get the actual new volume | |
447 | * from the log. */ | |
321f7536 RK |
448 | if(rtp_supported) { |
449 | int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100); | |
450 | mixer_control(&l, &r, 1); | |
451 | } else | |
452 | /* We don't want a reply, we'll get the actual new volume from the log. */ | |
453 | disorder_eclient_volume(client, 0, | |
454 | nearbyint(left(v, b) * 100), | |
455 | nearbyint(right(v, b) * 100), | |
456 | 0); | |
460b9539 | 457 | } |
458 | ||
219dc95c | 459 | /** @brief Formats the volume value */ |
460b9539 | 460 | static gchar *format_volume(GtkScale attribute((unused)) *scale, |
461 | gdouble value) { | |
462 | char s[32]; | |
463 | ||
464 | snprintf(s, sizeof s, "%.1f", (double)value); | |
2fc4475d | 465 | return g_strdup(s); |
460b9539 | 466 | } |
467 | ||
219dc95c | 468 | /** @brief Formats the balance value */ |
460b9539 | 469 | static gchar *format_balance(GtkScale attribute((unused)) *scale, |
470 | gdouble value) { | |
471 | char s[32]; | |
472 | ||
473 | if(fabs(value) < 0.1) | |
2fc4475d | 474 | return g_strdup("0"); |
460b9539 | 475 | snprintf(s, sizeof s, "%+.1f", (double)value); |
2fc4475d | 476 | return g_strdup(s); |
460b9539 | 477 | } |
478 | ||
479 | /* Volume mapping. We consider left, right, volume to be in [0,1] | |
480 | * and balance to be in [-1,1]. | |
481 | * | |
482 | * First, we just have volume = max(left, right). | |
483 | * | |
484 | * Balance we consider to linearly represent the amount by which the quieter | |
485 | * channel differs from the louder. In detail: | |
486 | * | |
487 | * if right > left then balance > 0: | |
488 | * balance = 0 => left = right (as an endpoint, not an instance) | |
489 | * balance = 1 => left = 0 | |
490 | * fitting to linear, left = right * (1 - balance) | |
491 | * so balance = 1 - left / right | |
492 | * (right > left => right > 0 so no division by 0.) | |
493 | * | |
494 | * if left > right then balance < 0: | |
495 | * balance = 0 => right = left (same caveat as above) | |
496 | * balance = -1 => right = 0 | |
497 | * again fitting to linear, right = left * (1 + balance) | |
498 | * so balance = right / left - 1 | |
499 | * (left > right => left > 0 so no division by 0.) | |
500 | * | |
501 | * if left = right then we just have balance = 0. | |
502 | * | |
503 | * Thanks to Clive and Andrew. | |
504 | */ | |
505 | ||
219dc95c | 506 | /** @brief Return the greater of @p x and @p y */ |
460b9539 | 507 | static double max(double x, double y) { |
508 | return x > y ? x : y; | |
509 | } | |
510 | ||
219dc95c | 511 | /** @brief Compute the left channel volume */ |
460b9539 | 512 | static double left(double v, double b) { |
513 | if(b > 0) /* volume = right */ | |
514 | return v * (1 - b); | |
515 | else /* volume = left */ | |
516 | return v; | |
517 | } | |
518 | ||
219dc95c | 519 | /** @brief Compute the right channel volume */ |
460b9539 | 520 | static double right(double v, double b) { |
521 | if(b > 0) /* volume = right */ | |
522 | return v; | |
523 | else /* volume = left */ | |
524 | return v * (1 + b); | |
525 | } | |
526 | ||
219dc95c | 527 | /** @brief Compute the overall volume */ |
460b9539 | 528 | static double volume(double l, double r) { |
529 | return max(l, r); | |
530 | } | |
531 | ||
219dc95c | 532 | /** @brief Compute the balance */ |
460b9539 | 533 | static double balance(double l, double r) { |
534 | if(l > r) | |
535 | return r / l - 1; | |
536 | else if(r > l) | |
537 | return 1 - l / r; | |
538 | else /* left = right */ | |
539 | return 0; | |
540 | } | |
541 | ||
a99c4e9a RK |
542 | /** @brief Called to enable RTP play |
543 | * | |
544 | * Rather odd signature is to fit in with the other icons which all call @ref | |
545 | * lib/eclient.h functions. | |
546 | */ | |
547 | static int enable_rtp(disorder_eclient attribute((unused)) *c, | |
548 | disorder_eclient_no_response attribute((unused)) *completed, | |
549 | void attribute((unused)) *v) { | |
550 | start_rtp(); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /** @brief Called to disable RTP play | |
555 | * | |
556 | * Rather odd signature is to fit in with the other icons which all call @ref | |
557 | * lib/eclient.h functions. | |
558 | */ | |
559 | static int disable_rtp(disorder_eclient attribute((unused)) *c, | |
560 | disorder_eclient_no_response attribute((unused)) *completed, | |
561 | void attribute((unused)) *v) { | |
562 | stop_rtp(); | |
563 | return 0; | |
564 | } | |
565 | ||
460b9539 | 566 | /* |
567 | Local Variables: | |
568 | c-basic-offset:2 | |
569 | comment-column:40 | |
570 | fill-column:79 | |
571 | indent-tabs-mode:nil | |
572 | End: | |
573 | */ |