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 <signal.h>
   6 #include <pulse/pulseaudio.h>
   7 #include "i3status.h"
   8 #include "queue.h"
   9
  10 #define APP_NAME "i3status"
  11 #define APP_ID "org.i3wm"
  12
  13 typedef struct indexed_volume_s {
  14     uint32_t idx;
  15     int volume;
  16     TAILQ_ENTRY(indexed_volume_s) entries;
  17 } indexed_volume_t;
  18
  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 uint32_t default_sink_idx = DEFAULT_SINK_INDEX;
  24 TAILQ_HEAD(tailhead, indexed_volume_s) cached_volume =
  25     TAILQ_HEAD_INITIALIZER(cached_volume);
  26 static pthread_mutex_t pulse_mutex = PTHREAD_MUTEX_INITIALIZER;
  27
  28 static void pulseaudio_error_log(pa_context *c) {
  29     fprintf(stderr,
  30             "i3status: PulseAudio: %s\n",
  31             pa_strerror(pa_context_errno(c)));
  32 }
  33
  34 static bool pulseaudio_free_operation(pa_context *c, pa_operation *o) {
  35     if (o)
  36         pa_operation_unref(o);
  37     else
  38         pulseaudio_error_log(c);
  39     /* return false if the operation failed */
  40     return o;
  41 }
  42
  43 /*
  44  * save the volume for the specified sink index
  45  * returning true if the value was changed
  46  */
  47 static bool save_volume(uint32_t sink_idx, int new_volume) {
  48     pthread_mutex_lock(&pulse_mutex);
  49     indexed_volume_t *entry;
  50     TAILQ_FOREACH(entry, &cached_volume, entries) {
  51         if (entry->idx == sink_idx) {
  52             const bool changed = (new_volume != entry->volume);
  53             entry->volume = new_volume;
  54             pthread_mutex_unlock(&pulse_mutex);
  55             return changed;
  56         }
  57     }
  58     /* index not found, store it */
  59     entry = malloc(sizeof(*entry));
  60     TAILQ_INSERT_HEAD(&cached_volume, entry, entries);
  61     entry->idx = sink_idx;
  62     entry->volume = new_volume;
  63     pthread_mutex_unlock(&pulse_mutex);
  64     return true;
  65 }
  66
  67 static void store_volume_from_sink_cb(pa_context *c,
  68                                       const pa_sink_info *info,
  69                                       int eol,
  70                                       void *userdata) {
  71     if (eol < 0) {
  72         if (pa_context_errno(c) == PA_ERR_NOENTITY)
  73             return;
  74
  75         pulseaudio_error_log(c);
  76         return;
  77     }
  78
  79     if (eol > 0)
  80         return;
  81
  82     int avg_vol = pa_cvolume_avg(&info->volume);
  83     int vol_perc = roundf((float)avg_vol * 100 / PA_VOLUME_NORM);
  84     int composed_volume = COMPOSE_VOLUME_MUTE(vol_perc, info->mute);
  85
  86     /* if this is the default sink we must try to save it twice: once with
  87      * DEFAULT_SINK_INDEX as the index, and another with its proper value
  88      * (using bitwise OR to avoid early-out logic) */
  89     if ((info->index == default_sink_idx &&
  90          save_volume(DEFAULT_SINK_INDEX, composed_volume)) |
  91         save_volume(info->index, composed_volume)) {
  92         /* if the volume or mute flag changed, wake the main thread */
  93         pthread_kill(main_thread, SIGUSR1);
  94     }
  95 }
  96
  97 static void get_sink_info(pa_context *c, uint32_t idx) {
  98     pa_operation *o =
  99         idx == DEFAULT_SINK_INDEX ? pa_context_get_sink_info_by_name(
 100                                         c, "@DEFAULT_SINK@", store_volume_from_sink_cb, NULL)
 101                                   : pa_context_get_sink_info_by_index(
 102                                         c, idx, store_volume_from_sink_cb, NULL);
 103     pulseaudio_free_operation(c, o);
 104 }
 105
 106 static void store_default_sink_cb(pa_context *c,
 107                                   const pa_sink_info *i,
 108                                   int eol,
 109                                   void *userdata) {
 110     if (i) {
 111         if (default_sink_idx != i->index) {
 112             /* default sink changed? */
 113             default_sink_idx = i->index;
 114             store_volume_from_sink_cb(c, i, eol, userdata);
 115         }
 116     }
 117 }
 118
 119 static void update_default_sink(pa_context *c) {
 120     pa_operation *o = pa_context_get_sink_info_by_name(
 121         c,
 122         "@DEFAULT_SINK@",
 123         store_default_sink_cb,
 124         NULL);
 125     pulseaudio_free_operation(c, o);
 126 }
 127
 128 static void subscribe_cb(pa_context *c, pa_subscription_event_type_t t,
 129                          uint32_t idx, void *userdata) {
 130     if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) != PA_SUBSCRIPTION_EVENT_CHANGE)
 131         return;
 132     pa_subscription_event_type_t facility =
 133         t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK;
 134     switch (facility) {
 135         case PA_SUBSCRIPTION_EVENT_SERVER:
 136             /* server change event, see if the default sink changed */
 137             update_default_sink(c);
 138             break;
 139         case PA_SUBSCRIPTION_EVENT_SINK:
 140             get_sink_info(c, idx);
 141             break;
 142         default:
 143             break;
 144     }
 145 }
 146
 147 static void context_state_callback(pa_context *c, void *userdata) {
 148     switch (pa_context_get_state(c)) {
 149         case PA_CONTEXT_UNCONNECTED:
 150         case PA_CONTEXT_CONNECTING:
 151         case PA_CONTEXT_AUTHORIZING:
 152         case PA_CONTEXT_SETTING_NAME:
 153         case PA_CONTEXT_TERMINATED:
 154         default:
 155             break;
 156
 157         case PA_CONTEXT_READY: {
 158             pa_context_set_subscribe_callback(c, subscribe_cb, NULL);
 159             update_default_sink(c);
 160
 161             pa_operation *o = pa_context_subscribe(
 162                 c,
 163                 PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SERVER,
 164                 NULL,
 165                 NULL);
 166             if (!pulseaudio_free_operation(c, o))
 167                 break;
 168             context_ready = true;
 169         } break;
 170
 171         case PA_CONTEXT_FAILED:
 172             pulseaudio_error_log(c);
 173             break;
 174     }
 175 }
 176
 177 /*
 178  * returns the current volume in percent, which, as per PulseAudio,
 179  * may be > 100%
 180  */
 181 int volume_pulseaudio(uint32_t sink_idx) {
 182     if (!context_ready || default_sink_idx == DEFAULT_SINK_INDEX)
 183         return -1;
 184
 185     pthread_mutex_lock(&pulse_mutex);
 186     const indexed_volume_t *entry;
 187     TAILQ_FOREACH(entry, &cached_volume, entries) {
 188         if (entry->idx == sink_idx) {
 189             int vol = entry->volume;
 190             pthread_mutex_unlock(&pulse_mutex);
 191             return vol;
 192         }
 193     }
 194     pthread_mutex_unlock(&pulse_mutex);
 195     /* first time requires a prime callback call because we only get
 196      * updates when the volume actually changes, but we need it to
 197      * be correct even if it never changes */
 198     pa_threaded_mainloop_lock(main_loop);
 199     get_sink_info(context, sink_idx);
 200     pa_threaded_mainloop_unlock(main_loop);
 201     /* show 0 while we don't have this information */
 202     return 0;
 203 }
 204
 205 /*
 206  *  detect and, if necessary, initialize the PulseAudio API
 207  */
 208 bool pulse_initialize(void) {
 209     if (!main_loop) {
 210         main_loop = pa_threaded_mainloop_new();
 211         if (!main_loop)
 212             return false;
 213     }
 214     if (!api) {
 215         api = pa_threaded_mainloop_get_api(main_loop);
 216         if (!api)
 217             return false;
 218     }
 219     if (!context) {
 220         pa_proplist *proplist = pa_proplist_new();
 221         pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, APP_NAME);
 222         pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, APP_ID);
 223         pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, VERSION);
 224         context = pa_context_new_with_proplist(api, APP_NAME, proplist);
 225         pa_proplist_free(proplist);
 226         if (!context)
 227             return false;
 228         pa_context_set_state_callback(context,
 229                                       context_state_callback,
 230                                       NULL);
 231         if (pa_context_connect(context,
 232                                NULL,
 233                                PA_CONTEXT_NOFAIL | PA_CONTEXT_NOAUTOSPAWN,
 234                                NULL) < 0) {
 235             pulseaudio_error_log(context);
 236             return false;
 237         }
 238         if (pa_threaded_mainloop_start(main_loop) < 0) {
 239             pulseaudio_error_log(context);
 240             pa_threaded_mainloop_free(main_loop);
 241             main_loop = NULL;
 242             return false;
 243         }
 244     }
 245     return true;
 246 }