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 <pulse/xmalloc.h>
  36 #include <pulse/util.h>
  37 #include <pulse/timeval.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/core.h>
  41 #include <pulsecore/module.h>
  42 #include <pulsecore/memchunk.h>
  43 #include <pulsecore/sink.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/core-util.h>
  46 #include <pulsecore/sample-util.h>
  47 #include <pulsecore/log.h>
  48 #include <pulsecore/macro.h>
  49 #include <pulsecore/thread.h>
  50 #include <pulsecore/core-error.h>
  51 #include <pulsecore/thread-mq.h>
  52 #include <pulsecore/rtpoll.h>
  53 #include <pulsecore/time-smoother.h>
  54 #include <pulsecore/rtclock.h>
  55
  56 #include "alsa-util.h"
  57 #include "alsa-source.h"
  58 #include "module-alsa-source-symdef.h"
  59
  60 PA_MODULE_AUTHOR("Lennart Poettering");
  61 PA_MODULE_DESCRIPTION("ALSA Source");
  62 PA_MODULE_VERSION(PACKAGE_VERSION);
  63 PA_MODULE_LOAD_ONCE(FALSE);
  64 PA_MODULE_USAGE(
  65         "name=<name for the source, to be prefixed> "
  66         "source_name=<name for the source> "
  67         "source_properties=<properties for the source> "
  68         "device=<ALSA device> "
  69         "device_id=<ALSA card index> "
  70         "format=<sample format> "
  71         "rate=<sample rate> "
  72         "channels=<number of channels> "
  73         "channel_map=<channel map> "
  74         "fragments=<number of fragments> "
  75         "fragment_size=<fragment size> "
  76         "mmap=<enable memory mapping?> "
  77         "tsched=<enable system timer based scheduling mode?> "
  78         "tsched_buffer_size=<buffer size when using timer based scheduling> "
  79         "tsched_buffer_watermark=<upper fill watermark> "
  80         "ignore_dB=<ignore dB information from the device?> "
  81         "control=<name of mixer control>");
  82
  83 static const char* const valid_modargs[] = {
  84     "name",
  85     "source_name",
  86     "source_properties",
  87     "device",
  88     "device_id",
  89     "format",
  90     "rate",
  91     "channels",
  92     "channel_map",
  93     "fragments",
  94     "fragment_size",
  95     "mmap",
  96     "tsched",
  97     "tsched_buffer_size",
  98     "tsched_buffer_watermark",
  99     "ignore_dB",
 100     "control",
 101     NULL
 102 };
 103
 104 int pa__init(pa_module*m) {
 105     pa_modargs *ma = NULL;
 106
 107     pa_assert(m);
 108
 109     pa_alsa_redirect_errors_inc();
 110     snd_config_update_free_global();
 111
 112     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 113         pa_log("Failed to parse module arguments");
 114         goto fail;
 115     }
 116
 117     if (!(m->userdata = pa_alsa_source_new(m, ma, __FILE__, NULL, NULL)))
 118         goto fail;
 119
 120     pa_modargs_free(ma);
 121
 122     return 0;
 123
 124 fail:
 125
 126     if (ma)
 127         pa_modargs_free(ma);
 128
 129     pa__done(m);
 130
 131     return -1;
 132 }
 133
 134 int pa__get_n_used(pa_module *m) {
 135     pa_source *source;
 136
 137     pa_assert(m);
 138     pa_assert_se(source = m->userdata);
 139
 140     return pa_source_linked_by(source);
 141 }
 142
 143 void pa__done(pa_module*m) {
 144     pa_source *source;
 145
 146     pa_assert(m);
 147
 148     if ((source = m->userdata))
 149         pa_alsa_source_free(source);
 150
 151     snd_config_update_free_global();
 152     pa_alsa_redirect_errors_dec();
 153 }