code.delx.au - pulseaudio/blob - src/modules/module-sine.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #include <pulse/xmalloc.h>
  29
  30 #include <pulsecore/sink-input.h>
  31 #include <pulsecore/module.h>
  32 #include <pulsecore/modargs.h>
  33 #include <pulsecore/namereg.h>
  34 #include <pulsecore/log.h>
  35
  36 #include "module-sine-symdef.h"
  37
  38 PA_MODULE_AUTHOR("Lennart Poettering");
  39 PA_MODULE_DESCRIPTION("Sine wave generator");
  40 PA_MODULE_VERSION(PACKAGE_VERSION);
  41 PA_MODULE_LOAD_ONCE(FALSE);
  42 PA_MODULE_USAGE(
  43         "sink=<sink to connect to> "
  44         "frequency=<frequency in Hz>");
  45
  46 struct userdata {
  47     pa_core *core;
  48     pa_module *module;
  49     pa_sink_input *sink_input;
  50     pa_memchunk memchunk;
  51     size_t peek_index;
  52 };
  53
  54 static const char* const valid_modargs[] = {
  55     "sink",
  56     "frequency",
  57     NULL,
  58 };
  59
  60 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
  61     struct userdata *u;
  62
  63     pa_sink_input_assert_ref(i);
  64     pa_assert_se(u = i->userdata);
  65     pa_assert(chunk);
  66
  67     *chunk = u->memchunk;
  68     pa_memblock_ref(chunk->memblock);
  69
  70     chunk->index += u->peek_index;
  71     chunk->length -= u->peek_index;
  72
  73     u->peek_index = 0;
  74
  75     return 0;
  76 }
  77
  78 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
  79     struct userdata *u;
  80
  81     pa_sink_input_assert_ref(i);
  82     pa_assert_se(u = i->userdata);
  83
  84     nbytes %= u->memchunk.length;
  85
  86     if (u->peek_index >= nbytes)
  87         u->peek_index -= nbytes;
  88     else
  89         u->peek_index = u->memchunk.length + u->peek_index - nbytes;
  90 }
  91
  92 static void sink_input_kill_cb(pa_sink_input *i) {
  93     struct userdata *u;
  94
  95     pa_sink_input_assert_ref(i);
  96     pa_assert_se(u = i->userdata);
  97
  98     pa_sink_input_unlink(u->sink_input);
  99     pa_sink_input_unref(u->sink_input);
 100     u->sink_input = NULL;
 101
 102     pa_module_unload_request(u->module, TRUE);
 103 }
 104
 105 /* Called from IO thread context */
 106 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
 107     struct userdata *u;
 108
 109     pa_sink_input_assert_ref(i);
 110     pa_assert_se(u = i->userdata);
 111
 112     /* If we are added for the first time, ask for a rewinding so that
 113      * we are heard right-away. */
 114     if (PA_SINK_INPUT_IS_LINKED(state) &&
 115         i->thread_info.state == PA_SINK_INPUT_INIT)
 116         pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
 117 }
 118
 119 int pa__init(pa_module*m) {
 120     pa_modargs *ma = NULL;
 121     struct userdata *u;
 122     pa_sink *sink;
 123     pa_sample_spec ss;
 124     uint32_t frequency;
 125     pa_sink_input_new_data data;
 126
 127     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 128         pa_log("Failed to parse module arguments");
 129         goto fail;
 130     }
 131
 132     if (!(sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink", NULL), PA_NAMEREG_SINK))) {
 133         pa_log("No such sink.");
 134         goto fail;
 135     }
 136
 137     ss.format = PA_SAMPLE_FLOAT32;
 138     ss.rate = sink->sample_spec.rate;
 139     ss.channels = 1;
 140
 141     frequency = 440;
 142     if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
 143         pa_log("Invalid frequency specification");
 144         goto fail;
 145     }
 146
 147     m->userdata = u = pa_xnew0(struct userdata, 1);
 148     u->core = m->core;
 149     u->module = m;
 150     u->sink_input = NULL;
 151
 152     u->peek_index = 0;
 153     pa_memchunk_sine(&u->memchunk, m->core->mempool, ss.rate, frequency);
 154
 155     pa_sink_input_new_data_init(&data);
 156     data.driver = __FILE__;
 157     data.module = m;
 158     pa_sink_input_new_data_set_sink(&data, sink, FALSE);
 159     pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME, "%u Hz Sine", frequency);
 160     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "abstract");
 161     pa_proplist_setf(data.proplist, "sine.hz", "%u", frequency);
 162     pa_sink_input_new_data_set_sample_spec(&data, &ss);
 163
 164     pa_sink_input_new(&u->sink_input, m->core, &data);
 165     pa_sink_input_new_data_done(&data);
 166
 167     if (!u->sink_input)
 168         goto fail;
 169
 170     u->sink_input->pop = sink_input_pop_cb;
 171     u->sink_input->process_rewind = sink_input_process_rewind_cb;
 172     u->sink_input->kill = sink_input_kill_cb;
 173     u->sink_input->state_change = sink_input_state_change_cb;
 174     u->sink_input->userdata = u;
 175
 176     pa_sink_input_put(u->sink_input);
 177
 178     pa_modargs_free(ma);
 179     return 0;
 180
 181 fail:
 182     if (ma)
 183         pa_modargs_free(ma);
 184
 185     pa__done(m);
 186     return -1;
 187 }
 188
 189 void pa__done(pa_module*m) {
 190     struct userdata *u;
 191
 192     pa_assert(m);
 193
 194     if (!(u = m->userdata))
 195         return;
 196
 197     if (u->sink_input) {
 198         pa_sink_input_unlink(u->sink_input);
 199         pa_sink_input_unref(u->sink_input);
 200     }
 201
 202     if (u->memchunk.memblock)
 203         pa_memblock_unref(u->memchunk.memblock);
 204
 205     pa_xfree(u);
 206 }