1 /***
2 This file is part of PulseAudio.
3
4 Copyright 2004-2008 Lennart Poettering
5 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
6
7 PulseAudio is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 2.1 of the License,
10 or (at your option) any later version.
11
12 PulseAudio is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
19 ***/
20
21 #ifdef HAVE_CONFIG_H
22 #include <config.h>
23 #endif
24
25 #include <stdio.h>
26
27 #include <alsa/asoundlib.h>
28
29 #ifdef HAVE_VALGRIND_MEMCHECK_H
30 #include <valgrind/memcheck.h>
31 #endif
32
33 #include <pulsecore/module.h>
34 #include <pulsecore/modargs.h>
35 #include <pulsecore/log.h>
36 #include <pulsecore/macro.h>
37
38 #include "alsa-util.h"
39 #include "alsa-source.h"
40
41 PA_MODULE_AUTHOR("Lennart Poettering");
42 PA_MODULE_DESCRIPTION("ALSA Source");
43 PA_MODULE_VERSION(PACKAGE_VERSION);
44 PA_MODULE_LOAD_ONCE(false);
45 PA_MODULE_USAGE(
46 "name=<name for the source, to be prefixed> "
47 "source_name=<name for the source> "
48 "source_properties=<properties for the source> "
49 "namereg_fail=<when false attempt to synthesise new source_name if it is already taken> "
50 "device=<ALSA device> "
51 "device_id=<ALSA card index> "
52 "format=<sample format> "
53 "rate=<sample rate> "
54 "alternate_rate=<alternate sample rate> "
55 "channels=<number of channels> "
56 "channel_map=<channel map> "
57 "fragments=<number of fragments> "
58 "fragment_size=<fragment size> "
59 "mmap=<enable memory mapping?> "
60 "tsched=<enable system timer based scheduling mode?> "
61 "tsched_buffer_size=<buffer size when using timer based scheduling> "
62 "tsched_buffer_watermark=<upper fill watermark> "
63 "ignore_dB=<ignore dB information from the device?> "
64 "control=<name of mixer control, or name and index separated by a comma>"
65 "deferred_volume=<Synchronize software and hardware volume changes to avoid momentary jumps?> "
66 "deferred_volume_safety_margin=<usec adjustment depending on volume direction> "
67 "deferred_volume_extra_delay=<usec adjustment to HW volume changes> "
68 "fixed_latency_range=<disable latency range changes on overrun?>");
69
70 static const char* const valid_modargs[] = {
71 "name",
72 "source_name",
73 "source_properties",
74 "namereg_fail",
75 "device",
76 "device_id",
77 "format",
78 "rate",
79 "alternate_rate",
80 "channels",
81 "channel_map",
82 "fragments",
83 "fragment_size",
84 "mmap",
85 "tsched",
86 "tsched_buffer_size",
87 "tsched_buffer_watermark",
88 "ignore_dB",
89 "control",
90 "deferred_volume",
91 "deferred_volume_safety_margin",
92 "deferred_volume_extra_delay",
93 "fixed_latency_range",
94 NULL
95 };
96
pa__init(pa_module * m)97 int pa__init(pa_module*m) {
98 pa_modargs *ma = NULL;
99
100 pa_assert(m);
101
102 pa_alsa_refcnt_inc();
103
104 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
105 pa_log("Failed to parse module arguments");
106 goto fail;
107 }
108
109 if (!(m->userdata = pa_alsa_source_new(m, ma, __FILE__, NULL, NULL)))
110 goto fail;
111
112 pa_modargs_free(ma);
113
114 return 0;
115
116 fail:
117
118 if (ma)
119 pa_modargs_free(ma);
120
121 pa__done(m);
122
123 return -1;
124 }
125
pa__get_n_used(pa_module * m)126 int pa__get_n_used(pa_module *m) {
127 pa_source *source;
128
129 pa_assert(m);
130 pa_assert_se(source = m->userdata);
131
132 return pa_source_linked_by(source);
133 }
134
pa__done(pa_module * m)135 void pa__done(pa_module*m) {
136 pa_source *source;
137
138 pa_assert(m);
139
140 if ((source = m->userdata))
141 pa_alsa_source_free(source);
142
143 pa_alsa_refcnt_dec();
144 }
145