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         "namereg_fail=<pa_namereg_register() fail parameter value> "
  69         "device=<ALSA device> "
  70         "device_id=<ALSA card index> "
  71         "format=<sample format> "
  72         "rate=<sample rate> "
  73         "channels=<number of channels> "
  74         "channel_map=<channel map> "
  75         "fragments=<number of fragments> "
  76         "fragment_size=<fragment size> "
  77         "mmap=<enable memory mapping?> "
  78         "tsched=<enable system timer based scheduling mode?> "
  79         "tsched_buffer_size=<buffer size when using timer based scheduling> "
  80         "tsched_buffer_watermark=<upper fill watermark> "
  81         "ignore_dB=<ignore dB information from the device?> "
  82         "control=<name of mixer control>");
  83
  84 static const char* const valid_modargs[] = {
  85     "name",
  86     "source_name",
  87     "source_properties",
  88     "namereg_fail",
  89     "device",
  90     "device_id",
  91     "format",
  92     "rate",
  93     "channels",
  94     "channel_map",
  95     "fragments",
  96     "fragment_size",
  97     "mmap",
  98     "tsched",
  99     "tsched_buffer_size",
 100     "tsched_buffer_watermark",
 101     "ignore_dB",
 102     "control",
 103     NULL
 104 };
 105
 106 int pa__init(pa_module*m) {
 107     pa_modargs *ma = NULL;
 108
 109     pa_assert(m);
 110
 111     pa_alsa_refcnt_inc();
 112
 113     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 114         pa_log("Failed to parse module arguments");
 115         goto fail;
 116     }
 117
 118     if (!(m->userdata = pa_alsa_source_new(m, ma, __FILE__, NULL, NULL)))
 119         goto fail;
 120
 121     pa_modargs_free(ma);
 122
 123     return 0;
 124
 125 fail:
 126
 127     if (ma)
 128         pa_modargs_free(ma);
 129
 130     pa__done(m);
 131
 132     return -1;
 133 }
 134
 135 int pa__get_n_used(pa_module *m) {
 136     pa_source *source;
 137
 138     pa_assert(m);
 139     pa_assert_se(source = m->userdata);
 140
 141     return pa_source_linked_by(source);
 142 }
 143
 144 void pa__done(pa_module*m) {
 145     pa_source *source;
 146
 147     pa_assert(m);
 148
 149     if ((source = m->userdata))
 150         pa_alsa_source_free(source);
 151
 152     pa_alsa_refcnt_dec();
 153 }