1 /*
2 * mainloop.c - main loop
3 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU 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, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include "aconfig.h"
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <errno.h>
23 #include <poll.h>
24 #include <panel.h>
25 #include <alsa/asoundlib.h>
26 #include "mem.h"
27 #include "die.h"
28 #include "colors.h"
29 #include "widget.h"
30 #include "mixer_widget.h"
31 #include "mixer_display.h"
32 #include "mixer_controls.h"
33 #include "mainloop.h"
34
35 static WINDOW *curses_initialized;
36
black_hole_error_handler(const char *file ATTRIBUTE_UNUSED, int line ATTRIBUTE_UNUSED, const char *function ATTRIBUTE_UNUSED, int err ATTRIBUTE_UNUSED, const char *fmt ATTRIBUTE_UNUSED, ...)37 static void black_hole_error_handler(const char *file ATTRIBUTE_UNUSED,
38 int line ATTRIBUTE_UNUSED,
39 const char *function ATTRIBUTE_UNUSED,
40 int err ATTRIBUTE_UNUSED,
41 const char *fmt ATTRIBUTE_UNUSED, ...)
42 {
43 }
44
initialize_curses(bool use_color, bool use_mouse)45 void initialize_curses(bool use_color, bool use_mouse)
46 {
47 curses_initialized = initscr();
48 cbreak();
49 noecho();
50 #ifdef HAVE_CURSES_ESCDELAY
51 set_escdelay(100);
52 #endif
53 window_size_changed(); /* update screen_lines/cols */
54 init_colors(use_color);
55 if (use_mouse)
56 mousemask(ALL_MOUSE_EVENTS, NULL);
57
58 snd_lib_error_set_handler(black_hole_error_handler);
59 }
60
app_shutdown(void)61 void app_shutdown(void)
62 {
63 if (curses_initialized) {
64 clear();
65 refresh();
66 curs_set(1);
67 endwin();
68 }
69 mixer_shutdown();
70 }
71
mainloop(void)72 void mainloop(void)
73 {
74 struct pollfd *pollfds = NULL;
75 int nfds = 0, n;
76 const struct widget *active_widget;
77 unsigned short revents;
78 int key;
79 int err;
80
81 for (;;) {
82 update_panels();
83 doupdate();
84
85 active_widget = get_active_widget();
86 if (!active_widget)
87 break;
88
89 n = 1 + snd_mixer_poll_descriptors_count(mixer);
90 if (n != nfds) {
91 free(pollfds);
92 nfds = n;
93 pollfds = ccalloc(nfds, sizeof *pollfds);
94 pollfds[0].fd = fileno(stdin);
95 pollfds[0].events = POLLIN;
96 }
97 err = snd_mixer_poll_descriptors(mixer, &pollfds[1], nfds - 1);
98 if (err < 0)
99 fatal_alsa_error("cannot get poll descriptors", err);
100 n = poll(pollfds, nfds, -1);
101 if (n < 0) {
102 if (errno == EINTR) {
103 pollfds[0].revents = 0;
104 doupdate(); /* handle SIGWINCH */
105 } else {
106 fatal_error("poll error");
107 }
108 }
109 if (pollfds[0].revents & (POLLERR | POLLHUP | POLLNVAL))
110 break;
111 if (pollfds[0].revents & POLLIN)
112 --n;
113 if (n > 0) {
114 err = snd_mixer_poll_descriptors_revents(mixer, &pollfds[1], nfds - 1, &revents);
115 if (err < 0)
116 fatal_alsa_error("cannot get poll events", err);
117 if (revents & (POLLERR | POLLNVAL))
118 close_mixer_device();
119 else if (revents & POLLIN)
120 snd_mixer_handle_events(mixer);
121 }
122 key = wgetch(active_widget->window);
123 while (key != ERR) {
124 #ifdef KEY_RESIZE
125 if (key == KEY_RESIZE)
126 window_size_changed();
127 else
128 #endif
129 active_widget->handle_key(key);
130 active_widget = get_active_widget();
131 if (!active_widget)
132 break;
133 key = wgetch(active_widget->window);
134 }
135 if (!active_widget)
136 break;
137 if (controls_changed) {
138 controls_changed = FALSE;
139 create_controls();
140 control_values_changed = FALSE;
141 display_controls();
142 } else if (control_values_changed) {
143 control_values_changed = FALSE;
144 display_controls();
145 }
146 }
147 free(pollfds);
148 }
149