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1 | /* |
2 | * This file is part of DisOrder. |
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3 | * Copyright (C) 2006, 2007 Richard Kettlewell |
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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 | */ |
20 | |
21 | #include "disobedience.h" |
22 | |
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23 | /* Forward declarations ---------------------------------------------------- */ |
24 | |
25 | WT(adjustment); |
26 | WT(hscale); |
27 | WT(hbox); |
28 | WT(tooltips); |
29 | WT(button); |
30 | WT(image); |
31 | WT(label); |
32 | WT(vbox); |
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33 | |
34 | struct icon; |
35 | |
36 | static void update_pause(const struct icon *); |
37 | static void update_play(const struct icon *); |
38 | static void update_scratch(const struct icon *); |
39 | static void update_random_enable(const struct icon *); |
40 | static void update_random_disable(const struct icon *); |
41 | static void update_enable(const struct icon *); |
42 | static void update_disable(const struct icon *); |
43 | static void clicked_icon(GtkButton *, gpointer); |
44 | |
45 | static double left(double v, double b); |
46 | static double right(double v, double b); |
47 | static double volume(double l, double r); |
48 | static double balance(double l, double r); |
49 | |
50 | static void volume_adjusted(GtkAdjustment *a, gpointer user_data); |
51 | static gchar *format_volume(GtkScale *scale, gdouble value); |
52 | static gchar *format_balance(GtkScale *scale, gdouble value); |
53 | |
54 | /* Control bar ------------------------------------------------------------- */ |
55 | |
56 | static int suppress_set_volume; |
57 | /* Guard against feedback loop in volume control */ |
58 | |
59 | static struct icon { |
60 | const char *icon; |
61 | const char *tip; |
62 | void (*clicked)(GtkButton *button, gpointer userdata); |
63 | void (*update)(const struct icon *i); |
64 | int (*action)(disorder_eclient *c, |
65 | disorder_eclient_no_response *completed, |
66 | void *v); |
67 | GtkWidget *button; |
68 | } icons[] = { |
69 | { "pause.png", "Pause playing track", clicked_icon, update_pause, |
70 | disorder_eclient_pause, 0 }, |
71 | { "play.png", "Resume playing track", clicked_icon, update_play, |
72 | disorder_eclient_resume, 0 }, |
73 | { "cross.png", "Cancel playing track", clicked_icon, update_scratch, |
74 | disorder_eclient_scratch_playing, 0 }, |
75 | { "random.png", "Enable random play", clicked_icon, update_random_enable, |
76 | disorder_eclient_random_enable, 0 }, |
77 | { "randomcross.png", "Disable random play", clicked_icon, update_random_disable, |
78 | disorder_eclient_random_disable, 0 }, |
79 | { "notes.png", "Enable play", clicked_icon, update_enable, |
80 | disorder_eclient_enable, 0 }, |
81 | { "notescross.png", "Disable play", clicked_icon, update_disable, |
82 | disorder_eclient_disable, 0 }, |
83 | }; |
84 | #define NICONS (int)(sizeof icons / sizeof *icons) |
85 | |
86 | GtkAdjustment *volume_adj, *balance_adj; |
87 | |
88 | /* Create the control bar */ |
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89 | GtkWidget *control_widget(void) { |
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90 | GtkWidget *hbox = gtk_hbox_new(FALSE, 1), *vbox; |
91 | GtkWidget *content; |
92 | GdkPixbuf *pb; |
93 | GtkWidget *v, *b; |
94 | GtkTooltips *tips = gtk_tooltips_new(); |
95 | int n; |
96 | |
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97 | NW(hbox); |
98 | NW(tooltips); |
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99 | D(("control_widget")); |
100 | for(n = 0; n < NICONS; ++n) { |
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101 | NW(button); |
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102 | icons[n].button = gtk_button_new(); |
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103 | if((pb = find_image(icons[n].icon))) { |
104 | NW(image); |
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105 | content = gtk_image_new_from_pixbuf(pb); |
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106 | } else { |
107 | NW(label); |
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108 | content = gtk_label_new(icons[n].icon); |
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109 | } |
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110 | gtk_container_add(GTK_CONTAINER(icons[n].button), content); |
111 | gtk_tooltips_set_tip(tips, icons[n].button, icons[n].tip, ""); |
112 | g_signal_connect(G_OBJECT(icons[n].button), "clicked", |
113 | G_CALLBACK(icons[n].clicked), &icons[n]); |
114 | /* pop the icon in a vbox so it doesn't get vertically stretch if there are |
115 | * taller things in the control bar */ |
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116 | NW(vbox); |
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117 | vbox = gtk_vbox_new(FALSE, 0); |
118 | gtk_box_pack_start(GTK_BOX(vbox), icons[n].button, TRUE, FALSE, 0); |
119 | gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0); |
120 | } |
121 | /* create the adjustments for the volume control */ |
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122 | NW(adjustment); |
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123 | volume_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, goesupto, |
124 | goesupto / 20, goesupto / 20, |
125 | 0)); |
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126 | NW(adjustment); |
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127 | balance_adj = GTK_ADJUSTMENT(gtk_adjustment_new(0, -1, 1, |
128 | 0.2, 0.2, 0)); |
129 | /* the volume control */ |
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130 | NW(hscale); |
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131 | v = gtk_hscale_new(volume_adj); |
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132 | NW(hscale); |
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133 | b = gtk_hscale_new(balance_adj); |
134 | gtk_scale_set_digits(GTK_SCALE(v), 10); |
135 | gtk_scale_set_digits(GTK_SCALE(b), 10); |
136 | gtk_widget_set_size_request(v, 192, -1); |
137 | gtk_widget_set_size_request(b, 192, -1); |
138 | gtk_tooltips_set_tip(tips, v, "Volume", ""); |
139 | gtk_tooltips_set_tip(tips, b, "Balance", ""); |
140 | gtk_box_pack_start(GTK_BOX(hbox), v, FALSE, TRUE, 0); |
141 | gtk_box_pack_start(GTK_BOX(hbox), b, FALSE, TRUE, 0); |
142 | /* space updates rather than hammering the server */ |
143 | gtk_range_set_update_policy(GTK_RANGE(v), GTK_UPDATE_DELAYED); |
144 | gtk_range_set_update_policy(GTK_RANGE(b), GTK_UPDATE_DELAYED); |
145 | /* notice when the adjustments are changed */ |
146 | g_signal_connect(G_OBJECT(volume_adj), "value-changed", |
147 | G_CALLBACK(volume_adjusted), 0); |
148 | g_signal_connect(G_OBJECT(balance_adj), "value-changed", |
149 | G_CALLBACK(volume_adjusted), 0); |
150 | /* format the volume/balance values ourselves */ |
151 | g_signal_connect(G_OBJECT(v), "format-value", |
152 | G_CALLBACK(format_volume), 0); |
153 | g_signal_connect(G_OBJECT(b), "format-value", |
154 | G_CALLBACK(format_balance), 0); |
155 | return hbox; |
156 | } |
157 | |
158 | /* Update the control bar after some kind of state change */ |
159 | void control_update(void) { |
160 | int n; |
161 | double l, r; |
162 | |
163 | D(("control_update")); |
164 | for(n = 0; n < NICONS; ++n) |
165 | icons[n].update(&icons[n]); |
166 | l = volume_l / 100.0; |
167 | r = volume_r / 100.0; |
168 | ++suppress_set_volume;; |
169 | gtk_adjustment_set_value(volume_adj, volume(l, r) * goesupto); |
170 | gtk_adjustment_set_value(balance_adj, balance(l, r)); |
171 | --suppress_set_volume; |
172 | } |
173 | |
174 | static void update_icon(GtkWidget *button, |
175 | int visible, int attribute((unused)) usable) { |
176 | (visible ? gtk_widget_show : gtk_widget_hide)(button); |
177 | /* TODO: show usability */ |
178 | } |
179 | |
180 | static void update_pause(const struct icon *icon) { |
181 | int visible = !(last_state & DISORDER_TRACK_PAUSED); |
182 | int usable = playing; /* TODO: might be a lie */ |
183 | update_icon(icon->button, visible, usable); |
184 | } |
185 | |
186 | static void update_play(const struct icon *icon) { |
187 | int visible = !!(last_state & DISORDER_TRACK_PAUSED); |
188 | int usable = playing; |
189 | update_icon(icon->button, visible, usable); |
190 | } |
191 | |
192 | static void update_scratch(const struct icon *icon) { |
193 | int visible = 1; |
194 | int usable = playing; |
195 | update_icon(icon->button, visible, usable); |
196 | } |
197 | |
198 | static void update_random_enable(const struct icon *icon) { |
199 | int visible = !(last_state & DISORDER_RANDOM_ENABLED); |
200 | int usable = 1; |
201 | update_icon(icon->button, visible, usable); |
202 | } |
203 | |
204 | static void update_random_disable(const struct icon *icon) { |
205 | int visible = !!(last_state & DISORDER_RANDOM_ENABLED); |
206 | int usable = 1; |
207 | update_icon(icon->button, visible, usable); |
208 | } |
209 | |
210 | static void update_enable(const struct icon *icon) { |
211 | int visible = !(last_state & DISORDER_PLAYING_ENABLED); |
212 | int usable = 1; |
213 | update_icon(icon->button, visible, usable); |
214 | } |
215 | |
216 | static void update_disable(const struct icon *icon) { |
217 | int visible = !!(last_state & DISORDER_PLAYING_ENABLED); |
218 | int usable = 1; |
219 | update_icon(icon->button, visible, usable); |
220 | } |
221 | |
222 | static void clicked_icon(GtkButton attribute((unused)) *button, |
223 | gpointer userdata) { |
224 | const struct icon *icon = userdata; |
225 | |
226 | icon->action(client, 0, 0); |
227 | } |
228 | |
229 | static void volume_adjusted(GtkAdjustment attribute((unused)) *a, |
230 | gpointer attribute((unused)) user_data) { |
231 | double v = gtk_adjustment_get_value(volume_adj) / goesupto; |
232 | double b = gtk_adjustment_get_value(balance_adj); |
233 | |
234 | if(suppress_set_volume) |
235 | /* This is the result of an update from the server, not a change from the |
236 | * user. Don't feedback! */ |
237 | return; |
238 | D(("volume_adjusted")); |
239 | /* force to 'stereotypical' values */ |
240 | v = nearbyint(100 * v) / 100; |
241 | b = nearbyint(5 * b) / 5; |
242 | /* Set the volume. We don't want a reply, we'll get the actual new volume |
243 | * from the log. */ |
244 | disorder_eclient_volume(client, 0, |
245 | nearbyint(left(v, b) * 100), |
246 | nearbyint(right(v, b) * 100), |
247 | 0); |
248 | } |
249 | |
250 | /* Called to format the volume value */ |
251 | static gchar *format_volume(GtkScale attribute((unused)) *scale, |
252 | gdouble value) { |
253 | char s[32]; |
254 | |
255 | snprintf(s, sizeof s, "%.1f", (double)value); |
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256 | return g_strdup(s); |
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257 | } |
258 | |
259 | /* Called to format the balance value. */ |
260 | static gchar *format_balance(GtkScale attribute((unused)) *scale, |
261 | gdouble value) { |
262 | char s[32]; |
263 | |
264 | if(fabs(value) < 0.1) |
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265 | return g_strdup("0"); |
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266 | snprintf(s, sizeof s, "%+.1f", (double)value); |
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267 | return g_strdup(s); |
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268 | } |
269 | |
270 | /* Volume mapping. We consider left, right, volume to be in [0,1] |
271 | * and balance to be in [-1,1]. |
272 | * |
273 | * First, we just have volume = max(left, right). |
274 | * |
275 | * Balance we consider to linearly represent the amount by which the quieter |
276 | * channel differs from the louder. In detail: |
277 | * |
278 | * if right > left then balance > 0: |
279 | * balance = 0 => left = right (as an endpoint, not an instance) |
280 | * balance = 1 => left = 0 |
281 | * fitting to linear, left = right * (1 - balance) |
282 | * so balance = 1 - left / right |
283 | * (right > left => right > 0 so no division by 0.) |
284 | * |
285 | * if left > right then balance < 0: |
286 | * balance = 0 => right = left (same caveat as above) |
287 | * balance = -1 => right = 0 |
288 | * again fitting to linear, right = left * (1 + balance) |
289 | * so balance = right / left - 1 |
290 | * (left > right => left > 0 so no division by 0.) |
291 | * |
292 | * if left = right then we just have balance = 0. |
293 | * |
294 | * Thanks to Clive and Andrew. |
295 | */ |
296 | |
297 | static double max(double x, double y) { |
298 | return x > y ? x : y; |
299 | } |
300 | |
301 | static double left(double v, double b) { |
302 | if(b > 0) /* volume = right */ |
303 | return v * (1 - b); |
304 | else /* volume = left */ |
305 | return v; |
306 | } |
307 | |
308 | static double right(double v, double b) { |
309 | if(b > 0) /* volume = right */ |
310 | return v; |
311 | else /* volume = left */ |
312 | return v * (1 + b); |
313 | } |
314 | |
315 | static double volume(double l, double r) { |
316 | return max(l, r); |
317 | } |
318 | |
319 | static double balance(double l, double r) { |
320 | if(l > r) |
321 | return r / l - 1; |
322 | else if(r > l) |
323 | return 1 - l / r; |
324 | else /* left = right */ |
325 | return 0; |
326 | } |
327 | |
328 | /* |
329 | Local Variables: |
330 | c-basic-offset:2 |
331 | comment-column:40 |
332 | fill-column:79 |
333 | indent-tabs-mode:nil |
334 | End: |
335 | */ |