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