code.delx.au - pulseaudio/blob - src/pulse/subscribe.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <assert.h>
  29 #include <stdio.h>
  30
  31 #include <pulsecore/gccmacro.h>
  32 #include <pulsecore/pstream-util.h>
  33
  34 #include "internal.h"
  35
  36 #include "subscribe.h"
  37
  38 void pa_command_subscribe_event(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
  39     pa_context *c = userdata;
  40     pa_subscription_event_type_t e;
  41     uint32_t idx;
  42
  43     assert(pd);
  44     assert(command == PA_COMMAND_SUBSCRIBE_EVENT);
  45     assert(t);
  46     assert(c);
  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
  65 pa_operation* pa_context_subscribe(pa_context *c, pa_subscription_mask_t m, pa_context_success_cb_t cb, void *userdata) {
  66     pa_operation *o;
  67     pa_tagstruct *t;
  68     uint32_t tag;
  69
  70     assert(c);
  71     assert(c->ref >= 1);
  72
  73     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
  74
  75     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
  76
  77     t = pa_tagstruct_command(c, PA_COMMAND_SUBSCRIBE, &tag);
  78     pa_tagstruct_putu32(t, m);
  79     pa_pstream_send_tagstruct(c->pstream, t);
  80     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);
  81
  82     return o;
  83 }
  84
  85 void pa_context_set_subscribe_callback(pa_context *c, pa_context_subscribe_cb_t cb, void *userdata) {
  86     assert(c);
  87     assert(c->ref >= 1);
  88
  89     c->subscribe_callback = cb;
  90     c->subscribe_userdata = userdata;
  91 }