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 | ||
460b9539 | 29 | struct icon; |
30 | ||
460b9539 | 31 | static void clicked_icon(GtkButton *, gpointer); |
ac6bf2ba | 32 | static void clicked_menu(GtkMenuItem *, gpointer userdata); |
2d504956 | 33 | static void toggled_menu(GtkCheckMenuItem *, gpointer userdata); |
460b9539 | 34 | |
a99c4e9a RK |
35 | static int enable_rtp(disorder_eclient *c, |
36 | disorder_eclient_no_response *completed, | |
37 | void *v); | |
38 | static int disable_rtp(disorder_eclient *c, | |
39 | disorder_eclient_no_response *completed, | |
40 | void *v); | |
41 | ||
460b9539 | 42 | static double left(double v, double b); |
43 | static double right(double v, double b); | |
44 | static double volume(double l, double r); | |
45 | static double balance(double l, double r); | |
46 | ||
47 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); | |
48 | static gchar *format_volume(GtkScale *scale, gdouble value); | |
49 | static gchar *format_balance(GtkScale *scale, gdouble value); | |
50 | ||
6856f665 RK |
51 | static void icon_changed(const char *event, |
52 | void *evendata, | |
53 | void *callbackdata); | |
1f868ca3 RK |
54 | static void volume_changed(const char *event, |
55 | void *eventdata, | |
56 | void *callbackdata); | |
57 | ||
460b9539 | 58 | /* Control bar ------------------------------------------------------------- */ |
59 | ||
fb44b59e RK |
60 | /** @brief Guard against feedback */ |
61 | int suppress_actions = 1; | |
460b9539 | 62 | |
219dc95c RK |
63 | /** @brief Definition of an icon |
64 | * | |
3849817f RK |
65 | * We have two kinds of icon: |
66 | * - action icons, which just do something but don't have a state as such | |
67 | * - toggle icons, which toggle between two states ("on" and "off"). | |
68 | * | |
69 | * The scratch button is an action icon; currently all the others are toggle | |
70 | * icons. | |
71 | * | |
72 | * (All icons can be sensitive or insensitive, separately to the above.) | |
219dc95c RK |
73 | */ |
74 | struct icon { | |
3849817f RK |
75 | /** @brief Filename for 'on' image */ |
76 | const char *icon_on; | |
77 | ||
78 | /** @brief Text for 'on' tooltip */ | |
79 | const char *tip_on; | |
219dc95c | 80 | |
3849817f RK |
81 | /** @brief Filename for 'off' image or NULL for an action icon */ |
82 | const char *icon_off; | |
83 | ||
84 | /** @brief Text for 'off tooltip */ | |
85 | const char *tip_off; | |
219dc95c | 86 | |
ac6bf2ba RK |
87 | /** @brief Associated menu item or NULL */ |
88 | const char *menuitem; | |
219dc95c | 89 | |
6856f665 RK |
90 | /** @brief Events that change this icon, separated by spaces */ |
91 | const char *events; | |
92 | ||
3849817f RK |
93 | /** @brief @ref eclient.h function to call to go from off to on |
94 | * | |
95 | * For action buttons, this should be NULL. | |
96 | */ | |
97 | int (*action_go_on)(disorder_eclient *c, | |
98 | disorder_eclient_no_response *completed, | |
99 | void *v); | |
219dc95c | 100 | |
3849817f RK |
101 | /** @brief @ref eclient.h function to call to go from on to off |
102 | * | |
103 | * For action buttons, this action is used. | |
104 | */ | |
105 | int (*action_go_off)(disorder_eclient *c, | |
106 | disorder_eclient_no_response *completed, | |
107 | void *v); | |
219dc95c | 108 | |
3849817f RK |
109 | /** @brief Get button state |
110 | * @return 1 for on, 0 for off | |
111 | */ | |
112 | int (*on)(void); | |
113 | ||
114 | /** @brief Get button sensitivity | |
115 | * @return 1 for sensitive, 0 for insensitive | |
116 | * | |
117 | * Can be NULL for always sensitive. | |
118 | */ | |
119 | int (*sensitive)(void); | |
2d504956 | 120 | |
219dc95c | 121 | /** @brief Pointer to button */ |
460b9539 | 122 | GtkWidget *button; |
ac6bf2ba RK |
123 | |
124 | /** @brief Pointer to menu item */ | |
125 | GtkWidget *item; | |
3849817f RK |
126 | |
127 | GtkWidget *image_on; | |
128 | GtkWidget *image_off; | |
219dc95c RK |
129 | }; |
130 | ||
3849817f RK |
131 | /* TODO: Add rights into the mix below */ |
132 | ||
133 | static int pause_resume_on(void) { | |
134 | return !(last_state & DISORDER_TRACK_PAUSED); | |
135 | } | |
136 | ||
137 | static int pause_resume_sensitive(void) { | |
6f09d54d RK |
138 | return !!(last_state & DISORDER_PLAYING) |
139 | && (last_rights & RIGHT_PAUSE); | |
3849817f RK |
140 | } |
141 | ||
142 | static int scratch_sensitive(void) { | |
6f09d54d | 143 | return !!(last_state & DISORDER_PLAYING) |
afe9f743 | 144 | && right_scratchable(last_rights, config->username, playing_track); |
6f09d54d RK |
145 | } |
146 | ||
147 | static int random_sensitive(void) { | |
148 | return !!(last_rights & RIGHT_GLOBAL_PREFS); | |
3849817f RK |
149 | } |
150 | ||
151 | static int random_enabled(void) { | |
152 | return !!(last_state & DISORDER_RANDOM_ENABLED); | |
153 | } | |
154 | ||
6f09d54d RK |
155 | static int playing_sensitive(void) { |
156 | return !!(last_rights & RIGHT_GLOBAL_PREFS); | |
157 | } | |
158 | ||
3849817f RK |
159 | static int playing_enabled(void) { |
160 | return !!(last_state & DISORDER_PLAYING_ENABLED); | |
161 | } | |
2d504956 | 162 | |
3849817f RK |
163 | static int rtp_enabled(void) { |
164 | return rtp_is_running; | |
165 | } | |
166 | ||
167 | static int rtp_sensitive(void) { | |
168 | return rtp_supported; | |
169 | } | |
2d504956 | 170 | |
219dc95c RK |
171 | /** @brief Table of all icons */ |
172 | static struct icon icons[] = { | |
2d504956 | 173 | { |
3849817f RK |
174 | icon_on: "pause.png", |
175 | tip_on: "Pause playing track", | |
176 | icon_off: "play.png", | |
177 | tip_off: "Resume playing track", | |
178 | menuitem: "<GdisorderMain>/Control/Playing", | |
179 | on: pause_resume_on, | |
180 | sensitive: pause_resume_sensitive, | |
181 | action_go_on: disorder_eclient_resume, | |
182 | action_go_off: disorder_eclient_pause, | |
6856f665 | 183 | events: "pause-changed playing-changed rights-changed", |
2d504956 RK |
184 | }, |
185 | { | |
3849817f RK |
186 | icon_on: "cross.png", |
187 | tip_on: "Cancel playing track", | |
188 | menuitem: "<GdisorderMain>/Control/Scratch", | |
189 | sensitive: scratch_sensitive, | |
190 | action_go_off: disorder_eclient_scratch_playing, | |
6856f665 | 191 | events: "playing-track-changed rights-changed", |
2d504956 RK |
192 | }, |
193 | { | |
3849817f RK |
194 | icon_on: "randomcross.png", |
195 | tip_on: "Disable random play", | |
196 | icon_off: "random.png", | |
197 | tip_off: "Enable random play", | |
198 | menuitem: "<GdisorderMain>/Control/Random play", | |
199 | on: random_enabled, | |
6f09d54d | 200 | sensitive: random_sensitive, |
3849817f RK |
201 | action_go_on: disorder_eclient_random_enable, |
202 | action_go_off: disorder_eclient_random_disable, | |
6856f665 | 203 | events: "random-changed rights-changed", |
2d504956 RK |
204 | }, |
205 | { | |
3849817f RK |
206 | icon_on: "notescross.png", |
207 | tip_on: "Disable play", | |
208 | icon_off: "notes.png", | |
209 | tip_off: "Enable play", | |
210 | on: playing_enabled, | |
6f09d54d | 211 | sensitive: playing_sensitive, |
3849817f RK |
212 | action_go_on: disorder_eclient_enable, |
213 | action_go_off: disorder_eclient_disable, | |
6856f665 | 214 | events: "enabled-changed rights-changed", |
2d504956 RK |
215 | }, |
216 | { | |
3849817f RK |
217 | icon_on: "speakercross.png", |
218 | tip_on: "Stop playing network stream", | |
219 | icon_off: "speaker.png", | |
220 | tip_off: "Play network stream", | |
221 | menuitem: "<GdisorderMain>/Control/Network player", | |
222 | on: rtp_enabled, | |
223 | sensitive: rtp_sensitive, | |
224 | action_go_on: enable_rtp, | |
6856f665 RK |
225 | action_go_off: disable_rtp, |
226 | events: "rtp-changed", | |
2d504956 | 227 | }, |
460b9539 | 228 | }; |
219dc95c RK |
229 | |
230 | /** @brief Count of icons */ | |
460b9539 | 231 | #define NICONS (int)(sizeof icons / sizeof *icons) |
232 | ||
219dc95c RK |
233 | static GtkAdjustment *volume_adj; |
234 | static GtkAdjustment *balance_adj; | |
3c499fe7 RK |
235 | static GtkWidget *volume_widget; |
236 | static GtkWidget *balance_widget; | |
460b9539 | 237 | |
219dc95c | 238 | /** @brief Create the control bar */ |
e9b70a84 | 239 | GtkWidget *control_widget(void) { |
460b9539 | 240 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
460b9539 | 241 | int n; |
242 | ||
243 | D(("control_widget")); | |
ac6bf2ba | 244 | assert(mainmenufactory); /* ordering must be right */ |
460b9539 | 245 | for(n = 0; n < NICONS; ++n) { |
3849817f | 246 | /* Create the button */ |
3849817f RK |
247 | icons[n].button = gtk_button_new(); |
248 | gtk_widget_set_style(icons[n].button, tool_style); | |
249 | icons[n].image_on = gtk_image_new_from_pixbuf(find_image(icons[n].icon_on)); | |
250 | gtk_widget_set_style(icons[n].image_on, tool_style); | |
251 | g_object_ref(icons[n].image_on); | |
252 | /* If it's a toggle icon, create the 'off' half too */ | |
253 | if(icons[n].icon_off) { | |
254 | icons[n].image_off = gtk_image_new_from_pixbuf(find_image(icons[n].icon_off)); | |
255 | gtk_widget_set_style(icons[n].image_off, tool_style); | |
256 | g_object_ref(icons[n].image_off); | |
257 | } | |
460b9539 | 258 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", |
ac6bf2ba | 259 | G_CALLBACK(clicked_icon), &icons[n]); |
460b9539 | 260 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
261 | * taller things in the control bar */ | |
262 | vbox = gtk_vbox_new(FALSE, 0); | |
263 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); | |
264 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); | |
ac6bf2ba | 265 | if(icons[n].menuitem) { |
3849817f | 266 | /* Find the menu item */ |
ac6bf2ba RK |
267 | icons[n].item = gtk_item_factory_get_widget(mainmenufactory, |
268 | icons[n].menuitem); | |
3849817f | 269 | if(icons[n].icon_off) |
2d504956 RK |
270 | g_signal_connect(G_OBJECT(icons[n].item), "toggled", |
271 | G_CALLBACK(toggled_menu), &icons[n]); | |
3849817f | 272 | else |
2d504956 RK |
273 | g_signal_connect(G_OBJECT(icons[n].item), "activate", |
274 | G_CALLBACK(clicked_menu), &icons[n]); | |
ac6bf2ba | 275 | } |
6856f665 RK |
276 | /* Make sure the icon is updated when relevant things changed */ |
277 | char **events = split(icons[n].events, 0, 0, 0, 0); | |
278 | while(*events) | |
279 | event_register(*events++, icon_changed, &icons[n]); | |
460b9539 | 280 | } |
281 | /* create the adjustments for the volume control */ | |
282 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, | |
283 | goesupto / 20, goesupto / 20, | |
284 | 0)); | |
285 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, | |
286 | 0.2, 0.2, 0)); | |
287 | /* the volume control */ | |
3c499fe7 | 288 | volume_widget = gtk_hscale_new(volume_adj); |
3c499fe7 RK |
289 | balance_widget = gtk_hscale_new(balance_adj); |
290 | gtk_widget_set_style(volume_widget, tool_style); | |
291 | gtk_widget_set_style(balance_widget, tool_style); | |
292 | gtk_scale_set_digits(GTK_SCALE(volume_widget), 10); | |
293 | gtk_scale_set_digits(GTK_SCALE(balance_widget), 10); | |
294 | gtk_widget_set_size_request(volume_widget, 192, -1); | |
295 | gtk_widget_set_size_request(balance_widget, 192, -1); | |
296 | gtk_tooltips_set_tip(tips, volume_widget, "Volume", ""); | |
297 | gtk_tooltips_set_tip(tips, balance_widget, "Balance", ""); | |
298 | gtk_box_pack_start(GTK_BOX(hbox), volume_widget, FALSE, TRUE, 0); | |
299 | gtk_box_pack_start(GTK_BOX(hbox), balance_widget, FALSE, TRUE, 0); | |
460b9539 | 300 | /* space updates rather than hammering the server */ |
3c499fe7 RK |
301 | gtk_range_set_update_policy(GTK_RANGE(volume_widget), GTK_UPDATE_DELAYED); |
302 | gtk_range_set_update_policy(GTK_RANGE(balance_widget), GTK_UPDATE_DELAYED); | |
460b9539 | 303 | /* notice when the adjustments are changed */ |
304 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", | |
305 | G_CALLBACK(volume_adjusted), 0); | |
306 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", | |
307 | G_CALLBACK(volume_adjusted), 0); | |
308 | /* format the volume/balance values ourselves */ | |
3c499fe7 | 309 | g_signal_connect(G_OBJECT(volume_widget), "format-value", |
460b9539 | 310 | G_CALLBACK(format_volume), 0); |
3c499fe7 | 311 | g_signal_connect(G_OBJECT(balance_widget), "format-value", |
460b9539 | 312 | G_CALLBACK(format_balance), 0); |
1f868ca3 | 313 | event_register("volume-changed", volume_changed, 0); |
6856f665 | 314 | event_register("rtp-changed", volume_changed, 0); |
460b9539 | 315 | return hbox; |
316 | } | |
317 | ||
6d1302f0 | 318 | /** @brief Update the volume control when it changes */ |
1f868ca3 RK |
319 | static void volume_changed(const char attribute((unused)) *event, |
320 | void attribute((unused)) *eventdata, | |
321 | void attribute((unused)) *callbackdata) { | |
460b9539 | 322 | double l, r; |
6856f665 | 323 | gboolean volume_supported; |
460b9539 | 324 | |
1f868ca3 | 325 | D(("volume_changed")); |
fb44b59e | 326 | ++suppress_actions; |
6856f665 RK |
327 | /* Only display volume/balance controls if they will work */ |
328 | if(!rtp_supported | |
329 | || (rtp_supported && mixer_supported(DEFAULT_BACKEND))) | |
330 | volume_supported = TRUE; | |
331 | else | |
332 | volume_supported = FALSE; | |
333 | /* TODO: if the server doesn't know how to set the volume [but isn't using | |
334 | * network play] then we should have volume_supported = FALSE */ | |
335 | if(volume_supported) { | |
336 | gtk_widget_show(volume_widget); | |
337 | gtk_widget_show(balance_widget); | |
338 | l = volume_l / 100.0; | |
339 | r = volume_r / 100.0; | |
340 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); | |
341 | gtk_adjustment_set_value(balance_adj, balance(l, r)); | |
342 | } else { | |
343 | gtk_widget_hide(volume_widget); | |
344 | gtk_widget_hide(balance_widget); | |
345 | } | |
fb44b59e | 346 | --suppress_actions; |
460b9539 | 347 | } |
348 | ||
ad58ebcc | 349 | /** @brief Update the state of one of the control icons |
ad58ebcc | 350 | */ |
6856f665 RK |
351 | static void icon_changed(const char attribute((unused)) *event, |
352 | void attribute((unused)) *evendata, | |
353 | void *callbackdata) { | |
354 | const struct icon *const icon = callbackdata; | |
3849817f RK |
355 | int on = icon->on ? icon->on() : 1; |
356 | int sensitive = icon->sensitive ? icon->sensitive() : 1; | |
357 | GtkWidget *child, *newchild; | |
358 | ||
359 | ++suppress_actions; | |
ad58ebcc | 360 | /* If the connection is down nothing is ever usable */ |
00959300 | 361 | if(!(last_state & DISORDER_CONNECTED)) |
3849817f RK |
362 | sensitive = 0; |
363 | /* Replace the child */ | |
364 | newchild = on ? icon->image_on : icon->image_off; | |
365 | child = gtk_bin_get_child(GTK_BIN(icon->button)); | |
366 | if(child != newchild) { | |
367 | if(child) | |
368 | gtk_container_remove(GTK_CONTAINER(icon->button), child); | |
369 | gtk_container_add(GTK_CONTAINER(icon->button), newchild); | |
370 | gtk_widget_show(newchild); | |
371 | } | |
7392b131 RK |
372 | /* If you disable play or random play NOT via the icon (for instance, via the |
373 | * edit menu or via a completely separate command line invocation) then the | |
374 | * icon shows up as insensitive. Hover the mouse over it and the corrcet | |
375 | * state is immediately displayed. sensitive and GTK_WIDGET_SENSITIVE show | |
376 | * it to be in the correct state, so I think this is may be a GTK+ bug. */ | |
3849817f RK |
377 | if(icon->tip_on) |
378 | gtk_tooltips_set_tip(tips, icon->button, | |
379 | on ? icon->tip_on : icon->tip_off, ""); | |
380 | gtk_widget_set_sensitive(icon->button, sensitive); | |
381 | /* Icons with an associated menu item */ | |
ac6bf2ba | 382 | if(icon->item) { |
3849817f RK |
383 | if(icon->icon_off) |
384 | gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(icon->item), on); | |
385 | gtk_widget_set_sensitive(icon->item, sensitive); | |
ac6bf2ba | 386 | } |
3849817f | 387 | --suppress_actions; |
a99c4e9a RK |
388 | } |
389 | ||
53fa91bb RK |
390 | static void icon_action_completed(void attribute((unused)) *v, |
391 | const char *error) { | |
392 | if(error) | |
393 | popup_protocol_error(0, error); | |
394 | } | |
395 | ||
460b9539 | 396 | static void clicked_icon(GtkButton attribute((unused)) *button, |
397 | gpointer userdata) { | |
398 | const struct icon *icon = userdata; | |
399 | ||
3849817f RK |
400 | if(suppress_actions) |
401 | return; | |
402 | if(!icon->on || icon->on()) | |
403 | icon->action_go_off(client, icon_action_completed, 0); | |
404 | else | |
405 | icon->action_go_on(client, icon_action_completed, 0); | |
460b9539 | 406 | } |
407 | ||
ac6bf2ba RK |
408 | static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem, |
409 | gpointer userdata) { | |
3849817f | 410 | clicked_icon(NULL, userdata); |
ac6bf2ba RK |
411 | } |
412 | ||
3849817f | 413 | static void toggled_menu(GtkCheckMenuItem attribute((unused)) *menuitem, |
2d504956 | 414 | gpointer userdata) { |
3849817f | 415 | clicked_icon(NULL, userdata); |
2d504956 RK |
416 | } |
417 | ||
699517af RK |
418 | /** @brief Called when a volume command completes */ |
419 | static void volume_completed(void attribute((unused)) *v, | |
420 | const char *error, | |
421 | int attribute((unused)) l, | |
422 | int attribute((unused)) r) { | |
423 | if(error) | |
424 | popup_protocol_error(0, error); | |
425 | /* We don't set the UI's notion of the volume here, it is set from the log | |
426 | * regardless of the reason it changed */ | |
427 | } | |
428 | ||
219dc95c | 429 | /** @brief Called when the volume has been adjusted */ |
460b9539 | 430 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
431 | gpointer attribute((unused)) user_data) { | |
432 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; | |
433 | double b = gtk_adjustment_get_value(balance_adj); | |
434 | ||
fb44b59e | 435 | if(suppress_actions) |
460b9539 | 436 | /* This is the result of an update from the server, not a change from the |
437 | * user. Don't feedback! */ | |
438 | return; | |
439 | D(("volume_adjusted")); | |
440 | /* force to 'stereotypical' values */ | |
441 | v = nearbyint(100 * v) / 100; | |
442 | b = nearbyint(5 * b) / 5; | |
443 | /* Set the volume. We don't want a reply, we'll get the actual new volume | |
444 | * from the log. */ | |
321f7536 RK |
445 | if(rtp_supported) { |
446 | int l = nearbyint(left(v, b) * 100), r = nearbyint(right(v, b) * 100); | |
3c499fe7 | 447 | mixer_control(DEFAULT_BACKEND, &l, &r, 1); |
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 | */ |