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-rtclock.h>
  41 #include <pulsecore/core.h>
  42 #include <pulsecore/module.h>
  43 #include <pulsecore/memchunk.h>
  44 #include <pulsecore/sink.h>
  45 #include <pulsecore/modargs.h>
  46 #include <pulsecore/core-util.h>
  47 #include <pulsecore/sample-util.h>
  48 #include <pulsecore/log.h>
  49 #include <pulsecore/macro.h>
  50 #include <pulsecore/thread.h>
  51 #include <pulsecore/core-error.h>
  52 #include <pulsecore/thread-mq.h>
  53 #include <pulsecore/rtpoll.h>
  54 #include <pulsecore/time-smoother.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_refcnt_inc();
 110
 111     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 112         pa_log("Failed to parse module arguments");
 113         goto fail;
 114     }
 115
 116     if (!(m->userdata = pa_alsa_source_new(m, ma, __FILE__, NULL, NULL)))
 117         goto fail;
 118
 119     pa_modargs_free(ma);
 120
 121     return 0;
 122
 123 fail:
 124
 125     if (ma)
 126         pa_modargs_free(ma);
 127
 128     pa__done(m);
 129
 130     return -1;
 131 }
 132
 133 int pa__get_n_used(pa_module *m) {
 134     pa_source *source;
 135
 136     pa_assert(m);
 137     pa_assert_se(source = m->userdata);
 138
 139     return pa_source_linked_by(source);
 140 }
 141
 142 void pa__done(pa_module*m) {
 143     pa_source *source;
 144
 145     pa_assert(m);
 146
 147     if ((source = m->userdata))
 148         pa_alsa_source_free(source);
 149
 150     pa_alsa_refcnt_dec();
 151 }