src/pulse/subscribe.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio 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 Lesser General Public License
  17   along with PulseAudio; 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
  28 #include <pulse/gccmacro.h>
  29
  30 #include <pulsecore/macro.h>
  31 #include <pulsecore/pstream-util.h>
  32
  33 #include "internal.h"
  34
  35 #include "subscribe.h"
  36
  37 void pa_command_subscribe_event(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
  38     pa_context *c = userdata;
  39     pa_subscription_event_type_t e;
  40     uint32_t idx;
  41
  42     pa_assert(pd);
  43     pa_assert(command == PA_COMMAND_SUBSCRIBE_EVENT);
  44     pa_assert(t);
  45     pa_assert(c);
  46     pa_assert(PA_REFCNT_VALUE(c) >= 1);
  47
  48     pa_context_ref(c);
  49
  50     if (pa_tagstruct_getu32(t, &e) < 0 ||
  51         pa_tagstruct_getu32(t, &idx) < 0 ||
  52         !pa_tagstruct_eof(t)) {
  53         pa_context_fail(c, PA_ERR_PROTOCOL);
  54         goto finish;
  55     }
  56
  57     if (c->subscribe_callback)
  58         c->subscribe_callback(c, e, idx, c->subscribe_userdata);
  59
  60 finish:
  61     pa_context_unref(c);
  62 }
  63
  64 pa_operation* pa_context_subscribe(pa_context *c, pa_subscription_mask_t m, pa_context_success_cb_t cb, void *userdata) {
  65     pa_operation *o;
  66     pa_tagstruct *t;
  67     uint32_t tag;
  68
  69     pa_assert(c);
  70     pa_assert(PA_REFCNT_VALUE(c) >= 1);
  71
  72     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
  73
  74     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
  75
  76     t = pa_tagstruct_command(c, PA_COMMAND_SUBSCRIBE, &tag);
  77     pa_tagstruct_putu32(t, m);
  78     pa_pstream_send_tagstruct(c->pstream, t);
  79     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
  80
  81     return o;
  82 }
  83
  84 void pa_context_set_subscribe_callback(pa_context *c, pa_context_subscribe_cb_t cb, void *userdata) {
  85     pa_assert(c);
  86     pa_assert(PA_REFCNT_VALUE(c) >= 1);
  87
  88     if (c->state == PA_CONTEXT_TERMINATED || c->state == PA_CONTEXT_FAILED)
  89         return;
  90
  91     c->subscribe_callback = cb;
  92     c->subscribe_userdata = userdata;
  93 }