code.delx.au - pulseaudio/blob - src/modules/module-position-event-sounds.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 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 <unistd.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <ctype.h>
  33
  34 #include <pulse/xmalloc.h>
  35 #include <pulse/volume.h>
  36 #include <pulse/channelmap.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/module.h>
  40 #include <pulsecore/core-util.h>
  41 #include <pulsecore/modargs.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/sink-input.h>
  44
  45 #include "module-position-event-sounds-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering");
  48 PA_MODULE_DESCRIPTION("Position event sounds between L and R depending on the position on screen of the widget triggering them.");
  49 PA_MODULE_VERSION(PACKAGE_VERSION);
  50 PA_MODULE_LOAD_ONCE(TRUE);
  51
  52 static const char* const valid_modargs[] = {
  53     NULL
  54 };
  55
  56 struct userdata {
  57     pa_hook_slot *sink_input_fixate_hook_slot;
  58 };
  59
  60 static pa_hook_result_t sink_input_fixate_hook_callback(pa_core *core, pa_sink_input_new_data *data, struct userdata *u) {
  61     const char *hpos;
  62     double f;
  63     char t[PA_CVOLUME_SNPRINT_MAX];
  64     pa_cvolume v;
  65
  66     pa_assert(data);
  67
  68     if (!(hpos = pa_proplist_gets(data->proplist, PA_PROP_EVENT_MOUSE_HPOS)))
  69         return PA_HOOK_OK;
  70
  71     if (pa_atod(hpos, &f) < 0) {
  72         pa_log_warn("Failed to parse "PA_PROP_EVENT_MOUSE_HPOS" property '%s'.", hpos);
  73         return PA_HOOK_OK;
  74     }
  75
  76     if (f < 0.0 || f > 1.0) {
  77         pa_log_warn("Property "PA_PROP_EVENT_MOUSE_HPOS" out of range %0.2f", f);
  78         return PA_HOOK_OK;
  79     }
  80
  81     pa_log_debug("Positioning event sound '%s' at %0.2f.", pa_strnull(pa_proplist_gets(data->proplist, PA_PROP_EVENT_ID)), f);
  82
  83     pa_cvolume_reset(&v, data->sample_spec.channels);
  84     pa_cvolume_set_balance(&v, &data->channel_map, f*2.0-1.0);
  85
  86     pa_log_debug("Final volume factor %s.", pa_cvolume_snprint(t, sizeof(t), &v));
  87
  88     pa_sink_input_new_data_apply_volume_factor(data, &v);
  89
  90     return PA_HOOK_OK;
  91 }
  92
  93 int pa__init(pa_module*m) {
  94     pa_modargs *ma = NULL;
  95     struct userdata *u;
  96
  97     pa_assert(m);
  98
  99     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 100         pa_log("Failed to parse module arguments");
 101         goto fail;
 102     }
 103
 104     m->userdata = u = pa_xnew(struct userdata, 1);
 105     u->sink_input_fixate_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_FIXATE], PA_HOOK_EARLY, (pa_hook_cb_t) sink_input_fixate_hook_callback, u);
 106
 107     pa_modargs_free(ma);
 108
 109     return 0;
 110
 111 fail:
 112     pa__done(m);
 113
 114     if (ma)
 115         pa_modargs_free(ma);
 116
 117     return  -1;
 118 }
 119
 120 void pa__done(pa_module*m) {
 121     struct userdata* u;
 122
 123     pa_assert(m);
 124
 125     if (!(u = m->userdata))
 126         return;
 127
 128     if (u->sink_input_fixate_hook_slot)
 129         pa_hook_slot_free(u->sink_input_fixate_hook_slot);
 130
 131     pa_xfree(u);
 132 }