2 * This file is part of DisOrder.
3 * Copyright (C) 2006, 2007 Richard Kettlewell
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.
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.
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
20 /** @file disobedience/control.c
21 * @brief Volume control and buttons
24 #include "disobedience.h"
26 /* Forward declarations ---------------------------------------------------- */
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 *);
45 static void update_rtp(const struct icon *);
46 static void update_nortp(const struct icon *);
47 static void clicked_icon(GtkButton *, gpointer);
48 static void clicked_menu(GtkMenuItem *, gpointer userdata);
50 static int enable_rtp(disorder_eclient *c,
51 disorder_eclient_no_response *completed,
53 static int disable_rtp(disorder_eclient *c,
54 disorder_eclient_no_response *completed,
57 static double left(double v, double b);
58 static double right(double v, double b);
59 static double volume(double l, double r);
60 static double balance(double l, double r);
62 static void volume_adjusted(GtkAdjustment *a, gpointer user_data);
63 static gchar *format_volume(GtkScale *scale, gdouble value);
64 static gchar *format_balance(GtkScale *scale, gdouble value);
66 /* Control bar ------------------------------------------------------------- */
68 /** @brief Guard against feedback loop in volume control */
69 static int suppress_set_volume;
71 /** @brief Definition of an icon
73 * The design here is rather mad: rather than changing the image displayed by
74 * icons according to their state, we flip the visibility of pairs of icons.
77 /** @brief Filename for image */
80 /** @brief Text for tooltip */
83 /** @brief Associated menu item or NULL */
86 /** @brief Called to update button when state may have changed */
87 void (*update)(const struct icon *i);
89 /** @brief @ref eclient.h function to call */
90 int (*action)(disorder_eclient *c,
91 disorder_eclient_no_response *completed,
94 /** @brief Pointer to button */
97 /** @brief Pointer to menu item */
101 /** @brief Table of all icons */
102 static struct icon icons[] = {
103 { "pause.png", "Pause playing track", 0,
105 disorder_eclient_pause, 0, 0 },
106 { "play.png", "Resume playing track", 0,
108 disorder_eclient_resume, 0, 0 },
109 { "cross.png", "Cancel playing track", "<GdisorderMain>/Control/Scratch",
111 disorder_eclient_scratch_playing, 0, 0 },
112 { "random.png", "Enable random play", 0,
113 update_random_enable,
114 disorder_eclient_random_enable, 0, 0 },
115 { "randomcross.png", "Disable random play", 0,
116 update_random_disable,
117 disorder_eclient_random_disable, 0, 0 },
118 { "notes.png", "Enable play", 0,
120 disorder_eclient_enable, 0, 0 },
121 { "notescross.png", "Disable play", 0,
123 disorder_eclient_disable, 0, 0 },
124 { "speaker.png", "Play network stream", 0,
127 { "speakercross.png", "Stop playing network stream", 0,
132 /** @brief Count of icons */
133 #define NICONS (int)(sizeof icons / sizeof *icons)
135 static GtkAdjustment *volume_adj;
136 static GtkAdjustment *balance_adj;
138 /** @brief Called whenever last_state changes in any way */
139 void control_monitor(void attribute((unused)) *u) {
142 D(("control_monitor"));
143 for(n = 0; n < NICONS; ++n)
144 icons[n].update(&icons[n]);
147 /** @brief Create the control bar */
148 GtkWidget *control_widget(void) {
149 GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox;
156 D(("control_widget"));
157 assert(mainmenufactory); /* ordering must be right */
158 for(n = 0; n < NICONS; ++n) {
160 icons[n].button = gtk_button_new();
161 if((pb = find_image(icons[n].icon))) {
163 content = gtk_image_new_from_pixbuf(pb);
166 content = gtk_label_new(icons[n].icon);
168 gtk_container_add(GTK_CONTAINER(icons[n].button), content);
169 gtk_tooltips_set_tip(tips, icons[n].button, icons[n].tip, "");
170 g_signal_connect(G_OBJECT(icons[n].button), "clicked",
171 G_CALLBACK(clicked_icon), &icons[n]);
172 /* pop the icon in a vbox so it doesn't get vertically stretch if there are
173 * taller things in the control bar */
175 vbox = gtk_vbox_new(FALSE, 0);
176 gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0);
177 gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
178 if(icons[n].menuitem) {
179 icons[n].item = gtk_item_factory_get_widget(mainmenufactory,
181 g_signal_connect(G_OBJECT(icons[n].item), "activate",
182 G_CALLBACK(clicked_menu), &icons[n]);
185 /* create the adjustments for the volume control */
187 volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto,
188 goesupto / 20, goesupto / 20,
191 balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1,
193 /* the volume control */
195 v = gtk_hscale_new(volume_adj);
197 b = gtk_hscale_new(balance_adj);
198 gtk_scale_set_digits(GTK_SCALE(v), 10);
199 gtk_scale_set_digits(GTK_SCALE(b), 10);
200 gtk_widget_set_size_request(v, 192, -1);
201 gtk_widget_set_size_request(b, 192, -1);
202 gtk_tooltips_set_tip(tips, v, "Volume", "");
203 gtk_tooltips_set_tip(tips, b, "Balance", "");
204 gtk_box_pack_start(GTK_BOX(hbox), v, FALSE, TRUE, 0);
205 gtk_box_pack_start(GTK_BOX(hbox), b, FALSE, TRUE, 0);
206 /* space updates rather than hammering the server */
207 gtk_range_set_update_policy(GTK_RANGE(v), GTK_UPDATE_DELAYED);
208 gtk_range_set_update_policy(GTK_RANGE(b), GTK_UPDATE_DELAYED);
209 /* notice when the adjustments are changed */
210 g_signal_connect(G_OBJECT(volume_adj), "value-changed",
211 G_CALLBACK(volume_adjusted), 0);
212 g_signal_connect(G_OBJECT(balance_adj), "value-changed",
213 G_CALLBACK(volume_adjusted), 0);
214 /* format the volume/balance values ourselves */
215 g_signal_connect(G_OBJECT(v), "format-value",
216 G_CALLBACK(format_volume), 0);
217 g_signal_connect(G_OBJECT(b), "format-value",
218 G_CALLBACK(format_balance), 0);
219 register_monitor(control_monitor, 0, -1UL);
223 /** @brief Update the volume control when it changes */
224 void volume_update(void) {
227 D(("volume_update"));
228 l = volume_l / 100.0;
229 r = volume_r / 100.0;
230 ++suppress_set_volume;
231 gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto);
232 gtk_adjustment_set_value(balance_adj, balance(l, r));
233 --suppress_set_volume;
236 /** @brief Update the state of one of the control icons
237 * @param icon Target icon
238 * @param visible True if this version of the button should be visible
239 * @param usable True if the button is currently usable
241 * Several of the icons, rather bizarrely, come in pairs: for instance exactly
242 * one of the play and pause buttons is supposed to be visible at any given
245 * @p usable need not take into account server availability, that is done
248 static void update_icon(const struct icon *icon,
249 int visible, int usable) {
250 /* If the connection is down nothing is ever usable */
251 if(!(last_state & DISORDER_CONNECTED))
253 (visible ? gtk_widget_show : gtk_widget_hide)(icon->button);
254 /* Only both updating usability if the button is visible */
256 gtk_widget_set_sensitive(icon->button, usable);
258 /* There's an associated menu item */
259 (visible ? gtk_widget_show : gtk_widget_hide)(icon->item);
261 gtk_widget_set_sensitive(icon->item, usable);
265 static void update_pause(const struct icon *icon) {
266 const int visible = !(last_state & DISORDER_TRACK_PAUSED);
267 const int usable = !!(last_state & DISORDER_PLAYING); /* TODO: might be a lie */
268 update_icon(icon, visible, usable);
271 static void update_play(const struct icon *icon) {
272 const int visible = !!(last_state & DISORDER_TRACK_PAUSED);
273 const int usable = !!(last_state & DISORDER_PLAYING);
274 update_icon(icon, visible, usable);
277 static void update_scratch(const struct icon *icon) {
278 const int visible = 1;
279 const int usable = !!(last_state & DISORDER_PLAYING);
280 update_icon(icon, visible, usable);
283 static void update_random_enable(const struct icon *icon) {
284 const int visible = !(last_state & DISORDER_RANDOM_ENABLED);
285 const int usable = 1;
286 update_icon(icon, visible, usable);
289 static void update_random_disable(const struct icon *icon) {
290 const int visible = !!(last_state & DISORDER_RANDOM_ENABLED);
291 const int usable = 1;
292 update_icon(icon, visible, usable);
295 static void update_enable(const struct icon *icon) {
296 const int visible = !(last_state & DISORDER_PLAYING_ENABLED);
297 const int usable = 1;
298 update_icon(icon, visible, usable);
301 static void update_disable(const struct icon *icon) {
302 const int visible = !!(last_state & DISORDER_PLAYING_ENABLED);
303 const int usable = 1;
304 update_icon(icon, visible, usable);
307 static void update_rtp(const struct icon *icon) {
308 const int visible = !rtp_is_running;
309 const int usable = rtp_supported;
310 update_icon(icon, visible, usable);
313 static void update_nortp(const struct icon *icon) {
314 const int visible = rtp_is_running;
315 const int usable = rtp_supported;
316 update_icon(icon, visible, usable);
319 static void clicked_icon(GtkButton attribute((unused)) *button,
321 const struct icon *icon = userdata;
323 icon->action(client, 0, 0);
326 static void clicked_menu(GtkMenuItem attribute((unused)) *menuitem,
328 const struct icon *icon = userdata;
330 icon->action(client, 0, 0);
333 /** @brief Called when the volume has been adjusted */
334 static void volume_adjusted(GtkAdjustment attribute((unused)) *a,
335 gpointer attribute((unused)) user_data) {
336 double v = gtk_adjustment_get_value(volume_adj) / goesupto;
337 double b = gtk_adjustment_get_value(balance_adj);
339 if(suppress_set_volume)
340 /* This is the result of an update from the server, not a change from the
341 * user. Don't feedback! */
343 D(("volume_adjusted"));
344 /* force to 'stereotypical' values */
345 v = nearbyint(100 * v) / 100;
346 b = nearbyint(5 * b) / 5;
347 /* Set the volume. We don't want a reply, we'll get the actual new volume
349 disorder_eclient_volume(client, 0,
350 nearbyint(left(v, b) * 100),
351 nearbyint(right(v, b) * 100),
355 /** @brief Formats the volume value */
356 static gchar *format_volume(GtkScale attribute((unused)) *scale,
360 snprintf(s, sizeof s, "%.1f", (double)value);
364 /** @brief Formats the balance value */
365 static gchar *format_balance(GtkScale attribute((unused)) *scale,
369 if(fabs(value) < 0.1)
370 return g_strdup("0");
371 snprintf(s, sizeof s, "%+.1f", (double)value);
375 /* Volume mapping. We consider left, right, volume to be in [0,1]
376 * and balance to be in [-1,1].
378 * First, we just have volume = max(left, right).
380 * Balance we consider to linearly represent the amount by which the quieter
381 * channel differs from the louder. In detail:
383 * if right > left then balance > 0:
384 * balance = 0 => left = right (as an endpoint, not an instance)
385 * balance = 1 => left = 0
386 * fitting to linear, left = right * (1 - balance)
387 * so balance = 1 - left / right
388 * (right > left => right > 0 so no division by 0.)
390 * if left > right then balance < 0:
391 * balance = 0 => right = left (same caveat as above)
392 * balance = -1 => right = 0
393 * again fitting to linear, right = left * (1 + balance)
394 * so balance = right / left - 1
395 * (left > right => left > 0 so no division by 0.)
397 * if left = right then we just have balance = 0.
399 * Thanks to Clive and Andrew.
402 /** @brief Return the greater of @p x and @p y */
403 static double max(double x, double y) {
404 return x > y ? x : y;
407 /** @brief Compute the left channel volume */
408 static double left(double v, double b) {
409 if(b > 0) /* volume = right */
411 else /* volume = left */
415 /** @brief Compute the right channel volume */
416 static double right(double v, double b) {
417 if(b > 0) /* volume = right */
419 else /* volume = left */
423 /** @brief Compute the overall volume */
424 static double volume(double l, double r) {
428 /** @brief Compute the balance */
429 static double balance(double l, double r) {
434 else /* left = right */
438 /** @brief Called to enable RTP play
440 * Rather odd signature is to fit in with the other icons which all call @ref
441 * lib/eclient.h functions.
443 static int enable_rtp(disorder_eclient attribute((unused)) *c,
444 disorder_eclient_no_response attribute((unused)) *completed,
445 void attribute((unused)) *v) {
450 /** @brief Called to disable RTP play
452 * Rather odd signature is to fit in with the other icons which all call @ref
453 * lib/eclient.h functions.
455 static int disable_rtp(disorder_eclient attribute((unused)) *c,
456 disorder_eclient_no_response attribute((unused)) *completed,
457 void attribute((unused)) *v) {