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" | |
25 | ||
e9b70a84 | 26 | /* Forward declarations ---------------------------------------------------- */ |
27 | ||
28 | WT(adjustment); | |
29 | WT(hscale); | |
30 | WT(hbox); | |
e9b70a84 | 31 | WT(button); |
32 | WT(image); | |
33 | WT(label); | |
34 | WT(vbox); | |
460b9539 | 35 | |
36 | struct icon; | |
37 | ||
38 | static void update_pause(const struct icon *); | |
39 | static void update_play(const struct icon *); | |
40 | static void update_scratch(const struct icon *); | |
41 | static void update_random_enable(const struct icon *); | |
42 | static void update_random_disable(const struct icon *); | |
43 | static void update_enable(const struct icon *); | |
44 | static void update_disable(const struct icon *); | |
a99c4e9a RK |
45 | static void update_rtp(const struct icon *); |
46 | static void update_nortp(const struct icon *); | |
460b9539 | 47 | static void clicked_icon(GtkButton *, gpointer); |
ac6bf2ba | 48 | static void clicked_menu(GtkMenuItem *, gpointer userdata); |
2d504956 | 49 | static void toggled_menu(GtkCheckMenuItem *, gpointer userdata); |
460b9539 | 50 | |
a99c4e9a RK |
51 | static int enable_rtp(disorder_eclient *c, |
52 | disorder_eclient_no_response *completed, | |
53 | void *v); | |
54 | static int disable_rtp(disorder_eclient *c, | |
55 | disorder_eclient_no_response *completed, | |
56 | void *v); | |
57 | ||
460b9539 | 58 | static double left(double v, double b); |
59 | static double right(double v, double b); | |
60 | static double volume(double l, double r); | |
61 | static double balance(double l, double r); | |
62 | ||
63 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); | |
64 | static gchar *format_volume(GtkScale *scale, gdouble value); | |
65 | static gchar *format_balance(GtkScale *scale, gdouble value); | |
66 | ||
67 | /* Control bar ------------------------------------------------------------- */ | |
68 | ||
219dc95c | 69 | /** @brief Guard against feedback loop in volume control */ |
460b9539 | 70 | static int suppress_set_volume; |
460b9539 | 71 | |
219dc95c RK |
72 | /** @brief Definition of an icon |
73 | * | |
74 | * The design here is rather mad: rather than changing the image displayed by | |
75 | * icons according to their state, we flip the visibility of pairs of icons. | |
76 | */ | |
77 | struct icon { | |
78 | /** @brief Filename for image */ | |
460b9539 | 79 | const char *icon; |
219dc95c RK |
80 | |
81 | /** @brief Text for tooltip */ | |
460b9539 | 82 | const char *tip; |
219dc95c | 83 | |
ac6bf2ba RK |
84 | /** @brief Associated menu item or NULL */ |
85 | const char *menuitem; | |
219dc95c RK |
86 | |
87 | /** @brief Called to update button when state may have changed */ | |
460b9539 | 88 | void (*update)(const struct icon *i); |
219dc95c RK |
89 | |
90 | /** @brief @ref eclient.h function to call */ | |
460b9539 | 91 | int (*action)(disorder_eclient *c, |
92 | disorder_eclient_no_response *completed, | |
93 | void *v); | |
219dc95c | 94 | |
2d504956 RK |
95 | /** @brief Flag */ |
96 | unsigned flags; | |
97 | ||
219dc95c | 98 | /** @brief Pointer to button */ |
460b9539 | 99 | GtkWidget *button; |
ac6bf2ba RK |
100 | |
101 | /** @brief Pointer to menu item */ | |
102 | GtkWidget *item; | |
219dc95c RK |
103 | }; |
104 | ||
2d504956 RK |
105 | /** @brief This is the active half of a pair */ |
106 | #define ICON_ACTIVE 0x0001 | |
107 | ||
108 | /** @brief This is the inactive half of a pair */ | |
109 | #define ICON_INACTIVE 0x0002 | |
110 | ||
219dc95c RK |
111 | /** @brief Table of all icons */ |
112 | static struct icon icons[] = { | |
2d504956 RK |
113 | { |
114 | "pause.png", /* icon */ | |
115 | "Pause playing track", /* tip */ | |
685bdfbd | 116 | "<GdisorderMain>/Control/Playing", /* menuitem */ |
2d504956 RK |
117 | update_pause, /* update */ |
118 | disorder_eclient_pause, /* action */ | |
685bdfbd | 119 | ICON_ACTIVE, /* flags */ |
2d504956 RK |
120 | 0, /* button */ |
121 | 0 /* item */ | |
122 | }, | |
123 | { | |
124 | "play.png", /* icon */ | |
125 | "Resume playing track", /* tip */ | |
685bdfbd | 126 | "<GdisorderMain>/Control/Playing", /* menuitem */ |
2d504956 RK |
127 | update_play, /* update */ |
128 | disorder_eclient_resume, /* action */ | |
685bdfbd | 129 | ICON_INACTIVE, /* flags */ |
2d504956 RK |
130 | 0, /* button */ |
131 | 0 /* item */ | |
132 | }, | |
133 | { | |
134 | "cross.png", /* icon */ | |
135 | "Cancel playing track", /* tip */ | |
136 | "<GdisorderMain>/Control/Scratch", /* menuitem */ | |
137 | update_scratch, /* update */ | |
138 | disorder_eclient_scratch_playing, /* action */ | |
139 | 0, /* flags */ | |
140 | 0, /* button */ | |
141 | 0 /* item */ | |
142 | }, | |
143 | { | |
144 | "random.png", /* icon */ | |
145 | "Enable random play", /* tip */ | |
146 | "<GdisorderMain>/Control/Random play", /* menuitem */ | |
147 | update_random_enable, /* update */ | |
148 | disorder_eclient_random_enable, /* action */ | |
149 | ICON_INACTIVE, /* flags */ | |
150 | 0, /* button */ | |
151 | 0 /* item */ | |
152 | }, | |
153 | { | |
154 | "randomcross.png", /* icon */ | |
155 | "Disable random play", /* tip */ | |
156 | "<GdisorderMain>/Control/Random play", /* menuitem */ | |
157 | update_random_disable, /* update */ | |
158 | disorder_eclient_random_disable, /* action */ | |
159 | ICON_ACTIVE, /* flags */ | |
160 | 0, /* button */ | |
161 | 0 /* item */ | |
162 | }, | |
163 | { | |
164 | "notes.png", /* icon */ | |
165 | "Enable play", /* tip */ | |
166 | 0, /* menuitem */ | |
167 | update_enable, /* update */ | |
168 | disorder_eclient_enable, /* action */ | |
169 | ICON_INACTIVE, /* flags */ | |
170 | 0, /* button */ | |
171 | 0 /* item */ | |
172 | }, | |
173 | { | |
174 | "notescross.png", /* icon */ | |
175 | "Disable play", /* tip */ | |
176 | 0, /* menuitem */ | |
177 | update_disable, /* update */ | |
178 | disorder_eclient_disable, /* action */ | |
179 | ICON_ACTIVE, /* flags */ | |
180 | 0, /* button */ | |
181 | 0 /* item */ | |
182 | }, | |
183 | { | |
184 | "speaker.png", /* icon */ | |
185 | "Play network stream", /* tip */ | |
685bdfbd | 186 | "<GdisorderMain>/Control/Network player", /* menuitem */ |
2d504956 RK |
187 | update_rtp, /* update */ |
188 | enable_rtp, /* action */ | |
189 | ICON_INACTIVE, /* flags */ | |
190 | 0, /* button */ | |
191 | 0 /* item */ | |
192 | }, | |
193 | { | |
194 | "speakercross.png", /* icon */ | |
195 | "Stop playing network stream", /* tip */ | |
685bdfbd | 196 | "<GdisorderMain>/Control/Network player", /* menuitem */ |
2d504956 RK |
197 | update_nortp, /* update */ |
198 | disable_rtp, /* action */ | |
199 | ICON_ACTIVE, /* flags */ | |
200 | 0, /* button */ | |
201 | 0 /* item */ | |
202 | }, | |
460b9539 | 203 | }; |
219dc95c RK |
204 | |
205 | /** @brief Count of icons */ | |
460b9539 | 206 | #define NICONS (int)(sizeof icons / sizeof *icons) |
207 | ||
219dc95c RK |
208 | static GtkAdjustment *volume_adj; |
209 | static GtkAdjustment *balance_adj; | |
460b9539 | 210 | |
6d1302f0 | 211 | /** @brief Called whenever last_state changes in any way */ |
a99c4e9a | 212 | void control_monitor(void attribute((unused)) *u) { |
6d1302f0 RK |
213 | int n; |
214 | ||
215 | D(("control_monitor")); | |
216 | for(n = 0; n < NICONS; ++n) | |
217 | icons[n].update(&icons[n]); | |
218 | } | |
219 | ||
219dc95c | 220 | /** @brief Create the control bar */ |
e9b70a84 | 221 | GtkWidget *control_widget(void) { |
460b9539 | 222 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
223 | GtkWidget *content; | |
224 | GdkPixbuf *pb; | |
225 | GtkWidget *v, *b; | |
460b9539 | 226 | int n; |
227 | ||
e9b70a84 | 228 | NW(hbox); |
460b9539 | 229 | D(("control_widget")); |
ac6bf2ba | 230 | assert(mainmenufactory); /* ordering must be right */ |
460b9539 | 231 | for(n = 0; n < NICONS; ++n) { |
e9b70a84 | 232 | NW(button); |
460b9539 | 233 | icons[n].button = gtk_button_new(); |
d4ef4132 RK |
234 | gtk_widget_modify_bg(icons[n].button, GTK_STATE_NORMAL, &tool_bg); |
235 | gtk_widget_modify_bg(icons[n].button, GTK_STATE_ACTIVE, &tool_active); | |
236 | gtk_widget_modify_bg(icons[n].button, GTK_STATE_PRELIGHT, &tool_active); | |
237 | gtk_widget_modify_bg(icons[n].button, GTK_STATE_SELECTED, &tool_active); | |
ced93033 | 238 | gtk_widget_modify_bg(icons[n].button, GTK_STATE_INSENSITIVE, &tool_active); |
e9b70a84 | 239 | if((pb = find_image(icons[n].icon))) { |
240 | NW(image); | |
460b9539 | 241 | content = gtk_image_new_from_pixbuf(pb); |
e9b70a84 | 242 | } else { |
243 | NW(label); | |
460b9539 | 244 | content = gtk_label_new(icons[n].icon); |
e9b70a84 | 245 | } |
460b9539 | 246 | gtk_container_add(GTK_CONTAINER(icons[n].button), content); |
247 | gtk_tooltips_set_tip(tips, icons[n].button, icons[n].tip, ""); | |
248 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", | |
ac6bf2ba | 249 | G_CALLBACK(clicked_icon), &icons[n]); |
460b9539 | 250 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
251 | * taller things in the control bar */ | |
e9b70a84 | 252 | NW(vbox); |
460b9539 | 253 | vbox = gtk_vbox_new(FALSE, 0); |
254 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); | |
255 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); | |
ac6bf2ba RK |
256 | if(icons[n].menuitem) { |
257 | icons[n].item = gtk_item_factory_get_widget(mainmenufactory, | |
258 | icons[n].menuitem); | |
2d504956 RK |
259 | switch(icons[n].flags & (ICON_ACTIVE|ICON_INACTIVE)) { |
260 | case ICON_ACTIVE: | |
261 | g_signal_connect(G_OBJECT(icons[n].item), "toggled", | |
262 | G_CALLBACK(toggled_menu), &icons[n]); | |
263 | break; | |
264 | case ICON_INACTIVE: | |
265 | /* Don't connect two instances of the signal! */ | |
266 | break; | |
267 | default: | |
268 | g_signal_connect(G_OBJECT(icons[n].item), "activate", | |
269 | G_CALLBACK(clicked_menu), &icons[n]); | |
270 | break; | |
271 | } | |
ac6bf2ba | 272 | } |
460b9539 | 273 | } |
274 | /* create the adjustments for the volume control */ | |
e9b70a84 | 275 | NW(adjustment); |
460b9539 | 276 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, |
277 | goesupto / 20, goesupto / 20, | |
278 | 0)); | |
e9b70a84 | 279 | NW(adjustment); |
460b9539 | 280 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, |
281 | 0.2, 0.2, 0)); | |
282 | /* the volume control */ | |
e9b70a84 | 283 | NW(hscale); |
460b9539 | 284 | v = gtk_hscale_new(volume_adj); |
e9b70a84 | 285 | NW(hscale); |
460b9539 | 286 | b = gtk_hscale_new(balance_adj); |
d4ef4132 RK |
287 | set_slider_colors(v); |
288 | set_slider_colors(b); | |
460b9539 | 289 | gtk_scale_set_digits(GTK_SCALE(v), 10); |
290 | gtk_scale_set_digits(GTK_SCALE(b), 10); | |
291 | gtk_widget_set_size_request(v, 192, -1); | |
292 | gtk_widget_set_size_request(b, 192, -1); | |
293 | gtk_tooltips_set_tip(tips, v, "Volume", ""); | |
294 | gtk_tooltips_set_tip(tips, b, "Balance", ""); | |
295 | gtk_box_pack_start(GTK_BOX(hbox), v, FALSE, TRUE, 0); | |
296 | gtk_box_pack_start(GTK_BOX(hbox), b, FALSE, TRUE, 0); | |
297 | /* space updates rather than hammering the server */ | |
298 | gtk_range_set_update_policy(GTK_RANGE(v), GTK_UPDATE_DELAYED); | |
299 | gtk_range_set_update_policy(GTK_RANGE(b), GTK_UPDATE_DELAYED); | |
300 | /* notice when the adjustments are changed */ | |
301 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", | |
302 | G_CALLBACK(volume_adjusted), 0); | |
303 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", | |
304 | G_CALLBACK(volume_adjusted), 0); | |
305 | /* format the volume/balance values ourselves */ | |
306 | g_signal_connect(G_OBJECT(v), "format-value", | |
307 | G_CALLBACK(format_volume), 0); | |
308 | g_signal_connect(G_OBJECT(b), "format-value", | |
309 | G_CALLBACK(format_balance), 0); | |
00959300 | 310 | register_monitor(control_monitor, 0, -1UL); |
460b9539 | 311 | return hbox; |
312 | } | |
313 | ||
6d1302f0 RK |
314 | /** @brief Update the volume control when it changes */ |
315 | void volume_update(void) { | |
460b9539 | 316 | double l, r; |
317 | ||
6d1302f0 | 318 | D(("volume_update")); |
460b9539 | 319 | l = volume_l / 100.0; |
320 | r = volume_r / 100.0; | |
00959300 | 321 | ++suppress_set_volume; |
460b9539 | 322 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); |
323 | gtk_adjustment_set_value(balance_adj, balance(l, r)); | |
324 | --suppress_set_volume; | |
325 | } | |
326 | ||
ad58ebcc | 327 | /** @brief Update the state of one of the control icons |
00959300 | 328 | * @param icon Target icon |
ad58ebcc | 329 | * @param visible True if this version of the button should be visible |
330 | * @param usable True if the button is currently usable | |
331 | * | |
332 | * Several of the icons, rather bizarrely, come in pairs: for instance exactly | |
333 | * one of the play and pause buttons is supposed to be visible at any given | |
334 | * moment. | |
335 | * | |
336 | * @p usable need not take into account server availability, that is done | |
337 | * automatically. | |
338 | */ | |
00959300 | 339 | static void update_icon(const struct icon *icon, |
ad58ebcc | 340 | int visible, int usable) { |
341 | /* If the connection is down nothing is ever usable */ | |
00959300 | 342 | if(!(last_state & DISORDER_CONNECTED)) |
ad58ebcc | 343 | usable = 0; |
00959300 | 344 | (visible ? gtk_widget_show : gtk_widget_hide)(icon->button); |
ad58ebcc | 345 | /* Only both updating usability if the button is visible */ |
346 | if(visible) | |
00959300 | 347 | gtk_widget_set_sensitive(icon->button, usable); |
ac6bf2ba | 348 | if(icon->item) { |
2d504956 RK |
349 | /* There's an associated menu item. These are always visible, but may not |
350 | * be usable. */ | |
351 | if((icon->flags & (ICON_ACTIVE|ICON_INACTIVE)) == ICON_ACTIVE) { | |
352 | /* The active half of a pair */ | |
353 | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), visible); | |
354 | } | |
355 | gtk_widget_set_sensitive(icon->item, usable); | |
ac6bf2ba | 356 | } |
460b9539 | 357 | } |
358 | ||
359 | static void update_pause(const struct icon *icon) { | |
00959300 RK |
360 | const int visible = !(last_state & DISORDER_TRACK_PAUSED); |
361 | const int usable = !!(last_state & DISORDER_PLAYING); /* TODO: might be a lie */ | |
362 | update_icon(icon, visible, usable); | |
460b9539 | 363 | } |
364 | ||
365 | static void update_play(const struct icon *icon) { | |
00959300 RK |
366 | const int visible = !!(last_state & DISORDER_TRACK_PAUSED); |
367 | const int usable = !!(last_state & DISORDER_PLAYING); | |
368 | update_icon(icon, visible, usable); | |
460b9539 | 369 | } |
370 | ||
371 | static void update_scratch(const struct icon *icon) { | |
00959300 RK |
372 | const int visible = 1; |
373 | const int usable = !!(last_state & DISORDER_PLAYING); | |
374 | update_icon(icon, visible, usable); | |
460b9539 | 375 | } |
376 | ||
377 | static void update_random_enable(const struct icon *icon) { | |
00959300 RK |
378 | const int visible = !(last_state & DISORDER_RANDOM_ENABLED); |
379 | const int usable = 1; | |
380 | update_icon(icon, visible, usable); | |
460b9539 | 381 | } |
382 | ||
383 | static void update_random_disable(const struct icon *icon) { | |
00959300 RK |
384 | const int visible = !!(last_state & DISORDER_RANDOM_ENABLED); |
385 | const int usable = 1; | |
386 | update_icon(icon, visible, usable); | |
460b9539 | 387 | } |
388 | ||
389 | static void update_enable(const struct icon *icon) { | |
00959300 RK |
390 | const int visible = !(last_state & DISORDER_PLAYING_ENABLED); |
391 | const int usable = 1; | |
392 | update_icon(icon, visible, usable); | |
460b9539 | 393 | } |
394 | ||
395 | static void update_disable(const struct icon *icon) { | |
00959300 RK |
396 | const int visible = !!(last_state & DISORDER_PLAYING_ENABLED); |
397 | const int usable = 1; | |
398 | update_icon(icon, visible, usable); | |
460b9539 | 399 | } |
400 | ||
a99c4e9a RK |
401 | static void update_rtp(const struct icon *icon) { |
402 | const int visible = !rtp_is_running; | |
403 | const int usable = rtp_supported; | |
404 | update_icon(icon, visible, usable); | |
405 | } | |
406 | ||
407 | static void update_nortp(const struct icon *icon) { | |
408 | const int visible = rtp_is_running; | |
409 | const int usable = rtp_supported; | |
410 | update_icon(icon, visible, usable); | |
411 | } | |
412 | ||
460b9539 | 413 | static void clicked_icon(GtkButton attribute((unused)) *button, |
414 | gpointer userdata) { | |
415 | const struct icon *icon = userdata; | |
416 | ||
417 | icon->action(client, 0, 0); | |
418 | } | |
419 | ||
ac6bf2ba RK |
420 | static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem, |
421 | gpointer userdata) { | |
422 | const struct icon *icon = userdata; | |
423 | ||
424 | icon->action(client, 0, 0); | |
425 | } | |
426 | ||
2d504956 RK |
427 | static void toggled_menu(GtkCheckMenuItem *menuitem, |
428 | gpointer userdata) { | |
429 | const struct icon *icon = userdata; | |
430 | size_t n; | |
431 | ||
432 | /* This is a bit fiddlier than the others, we need to find the action for the | |
433 | * new state. If the new state is active then we want the ICON_INACTIVE | |
434 | * version and vica versa. */ | |
435 | for(n = 0; n < NICONS; ++n) | |
436 | if(icons[n].item == icon->item | |
437 | && !!(icons[n].flags & ICON_INACTIVE) == !!menuitem->active) | |
438 | break; | |
439 | if(n < NICONS) | |
440 | icons[n].action(client, 0, 0); | |
441 | } | |
442 | ||
219dc95c | 443 | /** @brief Called when the volume has been adjusted */ |
460b9539 | 444 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
445 | gpointer attribute((unused)) user_data) { | |
446 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; | |
447 | double b = gtk_adjustment_get_value(balance_adj); | |
448 | ||
449 | if(suppress_set_volume) | |
450 | /* This is the result of an update from the server, not a change from the | |
451 | * user. Don't feedback! */ | |
452 | return; | |
453 | D(("volume_adjusted")); | |
454 | /* force to 'stereotypical' values */ | |
455 | v = nearbyint(100 * v) / 100; | |
456 | b = nearbyint(5 * b) / 5; | |
457 | /* Set the volume. We don't want a reply, we'll get the actual new volume | |
458 | * from the log. */ | |
459 | disorder_eclient_volume(client, 0, | |
460 | nearbyint(left(v, b) * 100), | |
461 | nearbyint(right(v, b) * 100), | |
462 | 0); | |
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 | */ |