summaryrefslogtreecommitdiffstats
path: root/src/modules/reserve-wrap.c
blob: d0d014d3324e5d41e24abf58ce7c3107d4587bfa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/***
  This file is part of PulseAudio.

  Copyright 2009 Lennart Poettering

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>

#include <pulse/xmalloc.h>
#include <pulse/i18n.h>

#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/shared.h>

#ifdef HAVE_DBUS
#include <pulsecore/dbus-shared.h>
#include "reserve.h"
#endif

#include "reserve-wrap.h"

struct pa_reserve_wrapper {
    PA_REFCNT_DECLARE;
    pa_core *core;
    pa_hook hook;
    char *shared_name;
#ifdef HAVE_DBUS
    pa_dbus_connection *connection;
    struct rd_device *device;
#endif
};

static void reserve_wrapper_free(pa_reserve_wrapper *r) {
    pa_assert(r);

#ifdef HAVE_DBUS
    if (r->device)
        rd_release(r->device);

    if (r->connection)
        pa_dbus_connection_unref(r->connection);
#endif

    pa_hook_done(&r->hook);

    if (r->shared_name) {
        pa_assert_se(pa_shared_remove(r->core, r->shared_name) >= 0);
        pa_xfree(r->shared_name);
    }

    pa_xfree(r);
}

#ifdef HAVE_DBUS
static int request_cb(rd_device *d, int forced) {
    pa_reserve_wrapper *r;
    int k;

    pa_assert(d);
    pa_assert_se(r = rd_get_userdata(d));
    pa_assert(PA_REFCNT_VALUE(r) >= 1);

    PA_REFCNT_INC(r);

    k = pa_hook_fire(&r->hook, PA_INT_TO_PTR(forced));
    pa_log_debug("Device unlock has been requested and %s.", k < 0 ? "failed" : "succeeded");

    pa_reserve_wrapper_unref(r);

    return k < 0 ? -1 : 1;
}
#endif

pa_reserve_wrapper* pa_reserve_wrapper_get(pa_core *c, const char *device_name) {
    pa_reserve_wrapper *r;
    int k;
    char *t;
#ifdef HAVE_DBUS
    DBusError error;

    dbus_error_init(&error);
#endif

    pa_assert(c);
    pa_assert(device_name);

    t = pa_sprintf_malloc("reserve-wrapper@%s", device_name);

    if ((r = pa_shared_get(c, t))) {
        pa_xfree(t);

        pa_assert(PA_REFCNT_VALUE(r) >= 1);
        PA_REFCNT_INC(r);

        return r;
    }

    r = pa_xnew0(pa_reserve_wrapper, 1);
    PA_REFCNT_INIT(r);
    r->core = c;
    pa_hook_init(&r->hook, r);
    r->shared_name = t;

    pa_assert_se(pa_shared_set(c, r->shared_name, r) >= 0);

#ifdef HAVE_DBUS
    if (!(r->connection = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
        pa_log_warn("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);

        /* We don't treat this as error here because we want allow PA
         * to run even when no session bus is available. */
        return r;
    }

    if ((k = rd_acquire(
                 &r->device,
                 pa_dbus_connection_get(r->connection),
                 device_name,
                 _("PulseAudio Sound Server"),
                 0,
                 request_cb,
                 NULL)) < 0) {

        if (k == -EBUSY) {
            pa_log_error("Device '%s' already locked.", device_name);
            goto fail;
        } else {
            pa_log_warn("Failed to acquire reservation lock on device '%s': %s", device_name, pa_cstrerror(-k));
            return r;
        }
    }

    pa_log_debug("Successfully acquired reservation lock on device '%s'", device_name);

    rd_set_userdata(r->device, r);

    return r;
fail:
    dbus_error_free(&error);

    reserve_wrapper_free(r);

    return NULL;
#else
    return r;
#endif
}

void pa_reserve_wrapper_unref(pa_reserve_wrapper *r) {
    pa_assert(r);
    pa_assert(PA_REFCNT_VALUE(r) >= 1);

    if (PA_REFCNT_DEC(r) > 0)
        return;

    reserve_wrapper_free(r);
}

pa_hook* pa_reserve_wrapper_hook(pa_reserve_wrapper *r) {
    pa_assert(r);
    pa_assert(PA_REFCNT_VALUE(r) >= 1);

    return &r->hook;
}

void pa_reserve_wrapper_set_application_device_name(pa_reserve_wrapper *r, const char *name) {
    pa_assert(r);
    pa_assert(PA_REFCNT_VALUE(r) >= 1);

#ifdef HAVE_DBUS
    rd_set_application_device_name(r->device, name);
#endif
}