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