1 // vim:ts=4:sw=4:expandtab
4 #include <pulse/pulseaudio.h>
8 #define APP_NAME "i3status"
9 #define APP_ID "org.i3wm"
11 typedef struct indexed_volume_s {
14 TAILQ_ENTRY(indexed_volume_s) entries;
17 static pa_threaded_mainloop *main_loop = NULL;
18 static pa_context *context = NULL;
19 static pa_mainloop_api *api = NULL;
20 static bool context_ready = false;
21 static uint32_t default_sink_idx = DEFAULT_SINK_INDEX;
22 TAILQ_HEAD(tailhead, indexed_volume_s) cached_volume =
23 TAILQ_HEAD_INITIALIZER(cached_volume);
24 static pthread_mutex_t pulse_mutex = PTHREAD_MUTEX_INITIALIZER;
26 static void pulseaudio_error_log(pa_context *c) {
28 "i3status: PulseAudio: %s\n",
29 pa_strerror(pa_context_errno(c)));
32 static bool pulseaudio_free_operation(pa_context *c, pa_operation *o) {
34 pa_operation_unref(o);
36 pulseaudio_error_log(c);
37 /* return false if the operation failed */
42 * save the volume for the specified sink index
43 * returning true if the value was changed
45 static bool save_volume(uint32_t sink_idx, int new_volume) {
46 pthread_mutex_lock(&pulse_mutex);
47 indexed_volume_t *entry;
48 TAILQ_FOREACH(entry, &cached_volume, entries) {
49 if (entry->idx == sink_idx) {
50 const bool changed = (new_volume != entry->volume);
51 entry->volume = new_volume;
52 pthread_mutex_unlock(&pulse_mutex);
56 /* index not found, store it */
57 entry = malloc(sizeof(*entry));
58 TAILQ_INSERT_HEAD(&cached_volume, entry, entries);
59 entry->idx = sink_idx;
60 entry->volume = new_volume;
61 pthread_mutex_unlock(&pulse_mutex);
65 static void store_volume_from_sink_cb(pa_context *c,
66 const pa_sink_info *info,
70 if (pa_context_errno(c) == PA_ERR_NOENTITY)
73 pulseaudio_error_log(c);
80 int avg_vol = pa_cvolume_avg(&info->volume);
81 int vol_perc = (int)((long long)avg_vol * 100 / PA_VOLUME_NORM);
83 /* if this is the default sink we must try to save it twice: once with
84 * DEFAULT_SINK_INDEX as the index, and another with its proper value
85 * (using bitwise OR to avoid early-out logic) */
86 if ((info->index == default_sink_idx &&
87 save_volume(DEFAULT_SINK_INDEX, vol_perc)) |
88 save_volume(info->index, vol_perc)) {
89 /* if the volume changed, wake the main thread */
90 pthread_mutex_lock(&i3status_sleep_mutex);
91 pthread_cond_broadcast(&i3status_sleep_cond);
92 pthread_mutex_unlock(&i3status_sleep_mutex);
96 static void get_sink_info(pa_context *c, uint32_t idx) {
98 idx == DEFAULT_SINK_INDEX ? pa_context_get_sink_info_by_name(
99 c, "@DEFAULT_SINK@", store_volume_from_sink_cb, NULL)
100 : pa_context_get_sink_info_by_index(
101 c, idx, store_volume_from_sink_cb, NULL);
102 pulseaudio_free_operation(c, o);
105 static void store_default_sink_cb(pa_context *c,
106 const pa_sink_info *i,
110 if (default_sink_idx != i->index) {
111 /* default sink changed? */
112 default_sink_idx = i->index;
113 store_volume_from_sink_cb(c, i, eol, userdata);
118 static void update_default_sink(pa_context *c) {
119 pa_operation *o = pa_context_get_sink_info_by_name(
122 store_default_sink_cb,
124 pulseaudio_free_operation(c, o);
127 static void subscribe_cb(pa_context *c, pa_subscription_event_type_t t,
128 uint32_t idx, void *userdata) {
129 if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) != PA_SUBSCRIPTION_EVENT_CHANGE)
131 pa_subscription_event_type_t facility =
132 t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
134 case PA_SUBSCRIPTION_EVENT_SERVER:
135 /* server change event, see if the default sink changed */
136 update_default_sink(c);
138 case PA_SUBSCRIPTION_EVENT_SINK:
139 get_sink_info(c, idx);
146 static void context_state_callback(pa_context *c, void *userdata) {
147 switch (pa_context_get_state(c)) {
148 case PA_CONTEXT_UNCONNECTED:
149 case PA_CONTEXT_CONNECTING:
150 case PA_CONTEXT_AUTHORIZING:
151 case PA_CONTEXT_SETTING_NAME:
152 case PA_CONTEXT_TERMINATED:
156 case PA_CONTEXT_READY: {
157 pa_context_set_subscribe_callback(c, subscribe_cb, NULL);
158 update_default_sink(c);
160 pa_operation *o = pa_context_subscribe(
162 PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SERVER,
165 if (!pulseaudio_free_operation(c, o))
167 context_ready = true;
170 case PA_CONTEXT_FAILED:
171 pulseaudio_error_log(c);
177 * returns the current volume in percent, which, as per PulseAudio,
180 int volume_pulseaudio(uint32_t sink_idx) {
181 if (!context_ready || default_sink_idx == DEFAULT_SINK_INDEX)
184 pthread_mutex_lock(&pulse_mutex);
185 const indexed_volume_t *entry;
186 TAILQ_FOREACH(entry, &cached_volume, entries) {
187 if (entry->idx == sink_idx) {
188 int vol = entry->volume;
189 pthread_mutex_unlock(&pulse_mutex);
193 pthread_mutex_unlock(&pulse_mutex);
194 /* first time requires a prime callback call because we only get
195 * updates when the volume actually changes, but we need it to
196 * be correct even if it never changes */
197 pa_threaded_mainloop_lock(main_loop);
198 get_sink_info(context, sink_idx);
199 pa_threaded_mainloop_unlock(main_loop);
200 /* show 0 while we don't have this information */
205 * detect and, if necessary, initialize the PulseAudio API
207 bool pulse_initialize(void) {
209 main_loop = pa_threaded_mainloop_new();
214 api = pa_threaded_mainloop_get_api(main_loop);
219 pa_proplist *proplist = pa_proplist_new();
220 pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, APP_NAME);
221 pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, APP_ID);
222 pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, VERSION);
223 context = pa_context_new_with_proplist(api, APP_NAME, proplist);
224 pa_proplist_free(proplist);
227 pa_context_set_state_callback(context,
228 context_state_callback,
230 if (pa_context_connect(context,
232 PA_CONTEXT_NOFAIL | PA_CONTEXT_NOAUTOSPAWN,
234 pulseaudio_error_log(context);
237 if (pa_threaded_mainloop_start(main_loop) < 0) {
238 pulseaudio_error_log(context);
239 pa_threaded_mainloop_free(main_loop);