git.sur5r.net Git - i3/i3status/blob - src/pulse.c

   1 // vim:ts=4:sw=4:expandtab
   2 #include <string.h>
   3 #include <stdio.h>
   4 #include <math.h>
   5 #include <pulse/pulseaudio.h>
   6 #include "i3status.h"
   7 #include "queue.h"
   8
   9 #define APP_NAME "i3status"
  10 #define APP_ID "org.i3wm"
  11
  12 typedef struct indexed_volume_s {
  13     uint32_t idx;
  14     int volume;
  15     TAILQ_ENTRY(indexed_volume_s) entries;
  16 } indexed_volume_t;
  17
  18 static pa_threaded_mainloop *main_loop = NULL;
  19 static pa_context *context = NULL;
  20 static pa_mainloop_api *api = NULL;
  21 static bool context_ready = false;
  22 static uint32_t default_sink_idx = DEFAULT_SINK_INDEX;
  23 TAILQ_HEAD(tailhead, indexed_volume_s) cached_volume =
  24     TAILQ_HEAD_INITIALIZER(cached_volume);
  25 static pthread_mutex_t pulse_mutex = PTHREAD_MUTEX_INITIALIZER;
  26
  27 static void pulseaudio_error_log(pa_context *c) {
  28     fprintf(stderr,
  29             "i3status: PulseAudio: %s\n",
  30             pa_strerror(pa_context_errno(c)));
  31 }
  32
  33 static bool pulseaudio_free_operation(pa_context *c, pa_operation *o) {
  34     if (o)
  35         pa_operation_unref(o);
  36     else
  37         pulseaudio_error_log(c);
  38     /* return false if the operation failed */
  39     return o;
  40 }
  41
  42 /*
  43  * save the volume for the specified sink index
  44  * returning true if the value was changed
  45  */
  46 static bool save_volume(uint32_t sink_idx, int new_volume) {
  47     pthread_mutex_lock(&pulse_mutex);
  48     indexed_volume_t *entry;
  49     TAILQ_FOREACH(entry, &cached_volume, entries) {
  50         if (entry->idx == sink_idx) {
  51             const bool changed = (new_volume != entry->volume);
  52             entry->volume = new_volume;
  53             pthread_mutex_unlock(&pulse_mutex);
  54             return changed;
  55         }
  56     }
  57     /* index not found, store it */
  58     entry = malloc(sizeof(*entry));
  59     TAILQ_INSERT_HEAD(&cached_volume, entry, entries);
  60     entry->idx = sink_idx;
  61     entry->volume = new_volume;
  62     pthread_mutex_unlock(&pulse_mutex);
  63     return true;
  64 }
  65
  66 static void store_volume_from_sink_cb(pa_context *c,
  67                                       const pa_sink_info *info,
  68                                       int eol,
  69                                       void *userdata) {
  70     if (eol < 0) {
  71         if (pa_context_errno(c) == PA_ERR_NOENTITY)
  72             return;
  73
  74         pulseaudio_error_log(c);
  75         return;
  76     }
  77
  78     if (eol > 0)
  79         return;
  80
  81     int avg_vol = pa_cvolume_avg(&info->volume);
  82     int vol_perc = roundf((float)avg_vol * 100 / PA_VOLUME_NORM);
  83     int composed_volume = COMPOSE_VOLUME_MUTE(vol_perc, info->mute);
  84
  85     /* if this is the default sink we must try to save it twice: once with
  86      * DEFAULT_SINK_INDEX as the index, and another with its proper value
  87      * (using bitwise OR to avoid early-out logic) */
  88     if ((info->index == default_sink_idx &&
  89          save_volume(DEFAULT_SINK_INDEX, composed_volume)) |
  90         save_volume(info->index, composed_volume)) {
  91         /* if the volume or mute flag changed, wake the main thread */
  92         pthread_mutex_lock(&i3status_sleep_mutex);
  93         pthread_cond_broadcast(&i3status_sleep_cond);
  94         pthread_mutex_unlock(&i3status_sleep_mutex);
  95     }
  96 }
  97
  98 static void get_sink_info(pa_context *c, uint32_t idx) {
  99     pa_operation *o =
 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);
 105 }
 106
 107 static void store_default_sink_cb(pa_context *c,
 108                                   const pa_sink_info *i,
 109                                   int eol,
 110                                   void *userdata) {
 111     if (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);
 116         }
 117     }
 118 }
 119
 120 static void update_default_sink(pa_context *c) {
 121     pa_operation *o = pa_context_get_sink_info_by_name(
 122         c,
 123         "@DEFAULT_SINK@",
 124         store_default_sink_cb,
 125         NULL);
 126     pulseaudio_free_operation(c, o);
 127 }
 128
 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)
 132         return;
 133     pa_subscription_event_type_t facility =
 134         t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
 135     switch (facility) {
 136         case PA_SUBSCRIPTION_EVENT_SERVER:
 137             /* server change event, see if the default sink changed */
 138             update_default_sink(c);
 139             break;
 140         case PA_SUBSCRIPTION_EVENT_SINK:
 141             get_sink_info(c, idx);
 142             break;
 143         default:
 144             break;
 145     }
 146 }
 147
 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:
 155         default:
 156             break;
 157
 158         case PA_CONTEXT_READY: {
 159             pa_context_set_subscribe_callback(c, subscribe_cb, NULL);
 160             update_default_sink(c);
 161
 162             pa_operation *o = pa_context_subscribe(
 163                 c,
 164                 PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SERVER,
 165                 NULL,
 166                 NULL);
 167             if (!pulseaudio_free_operation(c, o))
 168                 break;
 169             context_ready = true;
 170         } break;
 171
 172         case PA_CONTEXT_FAILED:
 173             pulseaudio_error_log(c);
 174             break;
 175     }
 176 }
 177
 178 /*
 179  * returns the current volume in percent, which, as per PulseAudio,
 180  * may be > 100%
 181  */
 182 int volume_pulseaudio(uint32_t sink_idx) {
 183     if (!context_ready || default_sink_idx == DEFAULT_SINK_INDEX)
 184         return -1;
 185
 186     pthread_mutex_lock(&pulse_mutex);
 187     const indexed_volume_t *entry;
 188     TAILQ_FOREACH(entry, &cached_volume, entries) {
 189         if (entry->idx == sink_idx) {
 190             int vol = entry->volume;
 191             pthread_mutex_unlock(&pulse_mutex);
 192             return vol;
 193         }
 194     }
 195     pthread_mutex_unlock(&pulse_mutex);
 196     /* first time requires a prime callback call because we only get
 197      * updates when the volume actually changes, but we need it to
 198      * be correct even if it never changes */
 199     pa_threaded_mainloop_lock(main_loop);
 200     get_sink_info(context, sink_idx);
 201     pa_threaded_mainloop_unlock(main_loop);
 202     /* show 0 while we don't have this information */
 203     return 0;
 204 }
 205
 206 /*
 207  *  detect and, if necessary, initialize the PulseAudio API
 208  */
 209 bool pulse_initialize(void) {
 210     if (!main_loop) {
 211         main_loop = pa_threaded_mainloop_new();
 212         if (!main_loop)
 213             return false;
 214     }
 215     if (!api) {
 216         api = pa_threaded_mainloop_get_api(main_loop);
 217         if (!api)
 218             return false;
 219     }
 220     if (!context) {
 221         pa_proplist *proplist = pa_proplist_new();
 222         pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, APP_NAME);
 223         pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, APP_ID);
 224         pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, VERSION);
 225         context = pa_context_new_with_proplist(api, APP_NAME, proplist);
 226         pa_proplist_free(proplist);
 227         if (!context)
 228             return false;
 229         pa_context_set_state_callback(context,
 230                                       context_state_callback,
 231                                       NULL);
 232         if (pa_context_connect(context,
 233                                NULL,
 234                                PA_CONTEXT_NOFAIL | PA_CONTEXT_NOAUTOSPAWN,
 235                                NULL) < 0) {
 236             pulseaudio_error_log(context);
 237             return false;
 238         }
 239         if (pa_threaded_mainloop_start(main_loop) < 0) {
 240             pulseaudio_error_log(context);
 241             pa_threaded_mainloop_free(main_loop);
 242             main_loop = NULL;
 243             return false;
 244         }
 245     }
 246     return true;
 247 }