code.delx.au - pulseaudio/blob - polyp/subscribe.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <assert.h>
  28
  29 #include "queue.h"
  30 #include "subscribe.h"
  31 #include "xmalloc.h"
  32
  33 struct pa_subscription {
  34     struct pa_core *core;
  35     int dead;
  36     void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata);
  37     void *userdata;
  38     enum pa_subscription_mask mask;
  39
  40     struct pa_subscription *prev, *next;
  41 };
  42
  43 struct pa_subscription_event {
  44     enum pa_subscription_event_type type;
  45     uint32_t index;
  46 };
  47
  48 static void sched_event(struct pa_core *c);
  49
  50 struct pa_subscription* pa_subscription_new(struct pa_core *c, enum pa_subscription_mask m, void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata), void *userdata) {
  51     struct pa_subscription *s;
  52     assert(c);
  53
  54     s = pa_xmalloc(sizeof(struct pa_subscription));
  55     s->core = c;
  56     s->dead = 0;
  57     s->callback = callback;
  58     s->userdata = userdata;
  59     s->mask = m;
  60
  61     if ((s->next = c->subscriptions))
  62         s->next->prev = s;
  63     s->prev = NULL;
  64     c->subscriptions = s;
  65     return s;
  66 }
  67
  68 void pa_subscription_free(struct pa_subscription*s) {
  69     assert(s && !s->dead);
  70     s->dead = 1;
  71     sched_event(s->core);
  72 }
  73
  74 static void free_item(struct pa_subscription *s) {
  75     assert(s && s->core);
  76
  77     if (s->prev)
  78         s->prev->next = s->next;
  79     else
  80         s->core->subscriptions = s->next;
  81
  82     if (s->next)
  83         s->next->prev = s->prev;
  84
  85     pa_xfree(s);
  86 }
  87
  88 void pa_subscription_free_all(struct pa_core *c) {
  89     struct pa_subscription_event *e;
  90     assert(c);
  91
  92     while (c->subscriptions)
  93         free_item(c->subscriptions);
  94
  95     if (c->subscription_event_queue) {
  96         while ((e = pa_queue_pop(c->subscription_event_queue)))
  97             pa_xfree(e);
  98
  99         pa_queue_free(c->subscription_event_queue, NULL, NULL);
 100         c->subscription_event_queue = NULL;
 101     }
 102
 103     if (c->subscription_defer_event) {
 104         c->mainloop->defer_free(c->subscription_defer_event);
 105         c->subscription_defer_event = NULL;
 106     }
 107 }
 108
 109 /*static void dump_event(struct pa_subscription_event*e) {
 110     switch (e->type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
 111         case PA_SUBSCRIPTION_EVENT_SINK:
 112             fprintf(stderr, "SINK_EVENT");
 113             break;
 114         case PA_SUBSCRIPTION_EVENT_SOURCE:
 115             fprintf(stderr, "SOURCE_EVENT");
 116             break;
 117         case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
 118             fprintf(stderr, "SINK_INPUT_EVENT");
 119             break;
 120         case PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT:
 121             fprintf(stderr, "SOURCE_OUTPUT_EVENT");
 122             break;
 123         case PA_SUBSCRIPTION_EVENT_MODULE:
 124             fprintf(stderr, "MODULE_EVENT");
 125             break;
 126         case PA_SUBSCRIPTION_EVENT_CLIENT:
 127             fprintf(stderr, "CLIENT_EVENT");
 128             break;
 129         default:
 130             fprintf(stderr, "OTHER");
 131             break;
 132     }
 133
 134     switch (e->type & PA_SUBSCRIPTION_EVENT_TYPE_MASK) {
 135         case PA_SUBSCRIPTION_EVENT_NEW:
 136             fprintf(stderr, " NEW");
 137             break;
 138         case PA_SUBSCRIPTION_EVENT_CHANGE:
 139             fprintf(stderr, " CHANGE");
 140             break;
 141         case PA_SUBSCRIPTION_EVENT_REMOVE:
 142             fprintf(stderr, " REMOVE");
 143             break;
 144         default:
 145             fprintf(stderr, " OTHER");
 146             break;
 147     }
 148
 149     fprintf(stderr, " %u\n", e->index);
 150 }*/
 151
 152 static void defer_cb(struct pa_mainloop_api *m, struct pa_defer_event *e, void *userdata) {
 153     struct pa_core *c = userdata;
 154     struct pa_subscription *s;
 155     assert(c && c->subscription_defer_event == e && c->mainloop == m);
 156
 157     c->mainloop->defer_enable(c->subscription_defer_event, 0);
 158
 159
 160     /* Dispatch queued events */
 161
 162     if (c->subscription_event_queue) {
 163         struct pa_subscription_event *e;
 164
 165         while ((e = pa_queue_pop(c->subscription_event_queue))) {
 166             struct pa_subscription *s;
 167
 168             for (s = c->subscriptions; s; s = s->next) {
 169
 170                 if (!s->dead && pa_subscription_match_flags(s->mask, e->type))
 171                     s->callback(c, e->type, e->index, s->userdata);
 172             }
 173
 174             pa_xfree(e);
 175         }
 176     }
 177
 178     /* Remove dead subscriptions */
 179
 180     s = c->subscriptions;
 181     while (s) {
 182         struct pa_subscription *n = s->next;
 183         if (s->dead)
 184             free_item(s);
 185         s = n;
 186     }
 187 }
 188
 189 static void sched_event(struct pa_core *c) {
 190     assert(c);
 191
 192     if (!c->subscription_defer_event) {
 193         c->subscription_defer_event = c->mainloop->defer_new(c->mainloop, defer_cb, c);
 194         assert(c->subscription_defer_event);
 195     }
 196
 197     c->mainloop->defer_enable(c->subscription_defer_event, 1);
 198 }
 199
 200
 201 void pa_subscription_post(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index) {
 202     struct pa_subscription_event *e;
 203     assert(c);
 204
 205     e = pa_xmalloc(sizeof(struct pa_subscription_event));
 206     e->type = t;
 207     e->index = index;
 208
 209     if (!c->subscription_event_queue) {
 210         c->subscription_event_queue = pa_queue_new();
 211         assert(c->subscription_event_queue);
 212     }
 213
 214     pa_queue_push(c->subscription_event_queue, e);
 215     sched_event(c);
 216 }
 217
 218