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         "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 }