1 // vim:ts=4:sw=4:expandtab
6 #include <pulse/pulseaudio.h>
10 #define APP_NAME "i3status"
11 #define APP_ID "org.i3wm"
13 typedef struct indexed_volume_s {
16 TAILQ_ENTRY(indexed_volume_s) entries;
19 static pa_threaded_mainloop *main_loop = NULL;
20 static pa_context *context = NULL;
21 static pa_mainloop_api *api = NULL;
22 static bool context_ready = false;
23 static bool mainloop_thread_running = false;
24 static uint32_t default_sink_idx = DEFAULT_SINK_INDEX;
25 TAILQ_HEAD(tailhead, indexed_volume_s) cached_volume =
26 TAILQ_HEAD_INITIALIZER(cached_volume);
27 static pthread_mutex_t pulse_mutex = PTHREAD_MUTEX_INITIALIZER;
29 static void pulseaudio_error_log(pa_context *c) {
31 "i3status: PulseAudio: %s\n",
32 pa_strerror(pa_context_errno(c)));
35 static bool pulseaudio_free_operation(pa_context *c, pa_operation *o) {
37 pa_operation_unref(o);
39 pulseaudio_error_log(c);
40 /* return false if the operation failed */
45 * save the volume for the specified sink index
46 * returning true if the value was changed
48 static bool save_volume(uint32_t sink_idx, int new_volume) {
49 pthread_mutex_lock(&pulse_mutex);
50 indexed_volume_t *entry;
51 TAILQ_FOREACH(entry, &cached_volume, entries) {
52 if (entry->idx == sink_idx) {
53 const bool changed = (new_volume != entry->volume);
54 entry->volume = new_volume;
55 pthread_mutex_unlock(&pulse_mutex);
59 /* index not found, store it */
60 entry = malloc(sizeof(*entry));
61 TAILQ_INSERT_HEAD(&cached_volume, entry, entries);
62 entry->idx = sink_idx;
63 entry->volume = new_volume;
64 pthread_mutex_unlock(&pulse_mutex);
68 static void store_volume_from_sink_cb(pa_context *c,
69 const pa_sink_info *info,
73 if (pa_context_errno(c) == PA_ERR_NOENTITY)
76 pulseaudio_error_log(c);
83 int avg_vol = pa_cvolume_avg(&info->volume);
84 int vol_perc = roundf((float)avg_vol * 100 / PA_VOLUME_NORM);
85 int composed_volume = COMPOSE_VOLUME_MUTE(vol_perc, info->mute);
87 /* if this is the default sink we must try to save it twice: once with
88 * DEFAULT_SINK_INDEX as the index, and another with its proper value
89 * (using bitwise OR to avoid early-out logic) */
90 if ((info->index == default_sink_idx &&
91 save_volume(DEFAULT_SINK_INDEX, composed_volume)) |
92 save_volume(info->index, composed_volume)) {
93 /* if the volume or mute flag changed, wake the main thread */
94 pthread_kill(main_thread, SIGUSR1);
98 static void get_sink_info(pa_context *c, uint32_t idx) {
100 idx == DEFAULT_SINK_INDEX ? pa_context_get_sink_info_by_name(
101 c, "@DEFAULT_SINK@", store_volume_from_sink_cb, NULL)
102 : pa_context_get_sink_info_by_index(
103 c, idx, store_volume_from_sink_cb, NULL);
104 pulseaudio_free_operation(c, o);
107 static void store_default_sink_cb(pa_context *c,
108 const pa_sink_info *i,
112 if (default_sink_idx != i->index) {
113 /* default sink changed? */
114 default_sink_idx = i->index;
115 store_volume_from_sink_cb(c, i, eol, userdata);
120 static void update_default_sink(pa_context *c) {
121 pa_operation *o = pa_context_get_sink_info_by_name(
124 store_default_sink_cb,
126 pulseaudio_free_operation(c, o);
129 static void subscribe_cb(pa_context *c, pa_subscription_event_type_t t,
130 uint32_t idx, void *userdata) {
131 if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) != PA_SUBSCRIPTION_EVENT_CHANGE)
133 pa_subscription_event_type_t facility =
134 t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
136 case PA_SUBSCRIPTION_EVENT_SERVER:
137 /* server change event, see if the default sink changed */
138 update_default_sink(c);
140 case PA_SUBSCRIPTION_EVENT_SINK:
141 get_sink_info(c, idx);
148 static void context_state_callback(pa_context *c, void *userdata) {
149 switch (pa_context_get_state(c)) {
150 case PA_CONTEXT_UNCONNECTED:
151 case PA_CONTEXT_CONNECTING:
152 case PA_CONTEXT_AUTHORIZING:
153 case PA_CONTEXT_SETTING_NAME:
154 case PA_CONTEXT_TERMINATED:
156 context_ready = false;
159 case PA_CONTEXT_READY: {
160 pa_context_set_subscribe_callback(c, subscribe_cb, NULL);
161 update_default_sink(c);
163 pa_operation *o = pa_context_subscribe(
165 PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SERVER,
168 if (!pulseaudio_free_operation(c, o))
170 context_ready = true;
173 case PA_CONTEXT_FAILED:
174 /* server disconnected us, attempt to reconnect */
175 context_ready = false;
176 pa_context_unref(context);
183 * returns the current volume in percent, which, as per PulseAudio,
186 int volume_pulseaudio(uint32_t sink_idx) {
187 if (!context_ready || default_sink_idx == DEFAULT_SINK_INDEX)
190 pthread_mutex_lock(&pulse_mutex);
191 const indexed_volume_t *entry;
192 TAILQ_FOREACH(entry, &cached_volume, entries) {
193 if (entry->idx == sink_idx) {
194 int vol = entry->volume;
195 pthread_mutex_unlock(&pulse_mutex);
199 pthread_mutex_unlock(&pulse_mutex);
200 /* first time requires a prime callback call because we only get
201 * updates when the volume actually changes, but we need it to
202 * be correct even if it never changes */
203 pa_threaded_mainloop_lock(main_loop);
204 get_sink_info(context, sink_idx);
205 pa_threaded_mainloop_unlock(main_loop);
206 /* show 0 while we don't have this information */
211 * detect and, if necessary, initialize the PulseAudio API
213 bool pulse_initialize(void) {
215 main_loop = pa_threaded_mainloop_new();
220 api = pa_threaded_mainloop_get_api(main_loop);
225 pa_proplist *proplist = pa_proplist_new();
226 pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, APP_NAME);
227 pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, APP_ID);
228 pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, VERSION);
229 context = pa_context_new_with_proplist(api, APP_NAME, proplist);
230 pa_proplist_free(proplist);
233 pa_context_set_state_callback(context,
234 context_state_callback,
236 if (pa_context_connect(context,
238 PA_CONTEXT_NOFAIL | PA_CONTEXT_NOAUTOSPAWN,
240 pulseaudio_error_log(context);
243 if (!mainloop_thread_running &&
244 pa_threaded_mainloop_start(main_loop) < 0) {
245 pulseaudio_error_log(context);
246 pa_threaded_mainloop_free(main_loop);
250 mainloop_thread_running = true;