code.delx.au - pulseaudio/blob - src/modules/alsa/module-alsa-source.c

   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, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28
  29 #include <asoundlib.h>
  30
  31 #ifdef HAVE_VALGRIND_MEMCHECK_H
  32 #include <valgrind/memcheck.h>
  33 #endif
  34
  35 #include <pulsecore/module.h>
  36 #include <pulsecore/modargs.h>
  37 #include <pulsecore/log.h>
  38 #include <pulsecore/macro.h>
  39
  40 #include "alsa-util.h"
  41 #include "alsa-source.h"
  42 #include "module-alsa-source-symdef.h"
  43
  44 PA_MODULE_AUTHOR("Lennart Poettering");
  45 PA_MODULE_DESCRIPTION("ALSA Source");
  46 PA_MODULE_VERSION(PACKAGE_VERSION);
  47 PA_MODULE_LOAD_ONCE(FALSE);
  48 PA_MODULE_USAGE(
  49         "name=<name for the source, to be prefixed> "
  50         "source_name=<name for the source> "
  51         "source_properties=<properties for the source> "
  52         "namereg_fail=<pa_namereg_register() fail parameter value> "
  53         "device=<ALSA device> "
  54         "device_id=<ALSA card index> "
  55         "format=<sample format> "
  56         "rate=<sample rate> "
  57         "channels=<number of channels> "
  58         "channel_map=<channel map> "
  59         "fragments=<number of fragments> "
  60         "fragment_size=<fragment size> "
  61         "mmap=<enable memory mapping?> "
  62         "tsched=<enable system timer based scheduling mode?> "
  63         "tsched_buffer_size=<buffer size when using timer based scheduling> "
  64         "tsched_buffer_watermark=<upper fill watermark> "
  65         "ignore_dB=<ignore dB information from the device?> "
  66         "control=<name of mixer control>"
  67         "sync_volume=<syncronize sw and hw voluchanges in IO-thread?> "
  68         "sync_volume_safety_margin=<usec adjustment depending on volume direction> "
  69         "sync_volume_extra_delay=<usec adjustment to HW volume changes>");
  70
  71 static const char* const valid_modargs[] = {
  72     "name",
  73     "source_name",
  74     "source_properties",
  75     "namereg_fail",
  76     "device",
  77     "device_id",
  78     "format",
  79     "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     "sync_volume",
  91     "sync_volume_safety_margin",
  92     "sync_volume_extra_delay",
  93     NULL
  94 };
  95
  96 int pa__init(pa_module*m) {
  97     pa_modargs *ma = NULL;
  98
  99     pa_assert(m);
 100
 101     pa_alsa_refcnt_inc();
 102
 103     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 104         pa_log("Failed to parse module arguments");
 105         goto fail;
 106     }
 107
 108     if (!(m->userdata = pa_alsa_source_new(m, ma, __FILE__, NULL, NULL)))
 109         goto fail;
 110
 111     pa_modargs_free(ma);
 112
 113     return 0;
 114
 115 fail:
 116
 117     if (ma)
 118         pa_modargs_free(ma);
 119
 120     pa__done(m);
 121
 122     return -1;
 123 }
 124
 125 int pa__get_n_used(pa_module *m) {
 126     pa_source *source;
 127
 128     pa_assert(m);
 129     pa_assert_se(source = m->userdata);
 130
 131     return pa_source_linked_by(source);
 132 }
 133
 134 void pa__done(pa_module*m) {
 135     pa_source *source;
 136
 137     pa_assert(m);
 138
 139     if ((source = m->userdata))
 140         pa_alsa_source_free(source);
 141
 142     pa_alsa_refcnt_dec();
 143 }