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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio 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 polypaudio; 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 <assert.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31 #include <regex.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34
  35 #include <polypcore/module.h>
  36 #include <polypcore/util.h>
  37 #include <polypcore/modargs.h>
  38 #include <polypcore/log.h>
  39 #include <polypcore/core-subscribe.h>
  40 #include <polypcore/xmalloc.h>
  41 #include <polypcore/sink-input.h>
  42
  43 #include "module-match-symdef.h"
  44
  45 PA_MODULE_AUTHOR("Lennart Poettering")
  46 PA_MODULE_DESCRIPTION("Sink input matching module")
  47 PA_MODULE_USAGE("table=<filename>")
  48 PA_MODULE_VERSION(PACKAGE_VERSION)
  49
  50 #define WHITESPACE "\n\r \t"
  51
  52 #ifndef DEFAULT_CONFIG_DIR
  53 #define DEFAULT_CONFIG_DIR "/etc/polypaudio"
  54 #endif
  55
  56 #define DEFAULT_MATCH_TABLE_FILE DEFAULT_CONFIG_DIR"/match.table"
  57 #define DEFAULT_MATCH_TABLE_FILE_USER ".polypaudio/match.table"
  58
  59 static const char* const valid_modargs[] = {
  60     "table",
  61     NULL,
  62 };
  63
  64 struct rule {
  65     regex_t regex;
  66     pa_volume_t volume;
  67     struct rule *next;
  68 };
  69
  70 struct userdata {
  71     struct rule *rules;
  72     pa_subscription *subscription;
  73 };
  74
  75 static int load_rules(struct userdata *u, const char *filename) {
  76     FILE *f;
  77     int n = 0;
  78     int ret = -1;
  79     struct rule *end = NULL;
  80     char *fn = NULL;
  81
  82     f = filename ?
  83         fopen(fn = pa_xstrdup(filename), "r") :
  84         pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn);
  85
  86     if (!f) {
  87         pa_log(__FILE__": failed to open file '%s': %s", fn, strerror(errno));
  88         goto finish;
  89     }
  90
  91     while (!feof(f)) {
  92         char *d, *v;
  93         pa_volume_t volume;
  94         uint32_t k;
  95         regex_t regex;
  96         char ln[256];
  97         struct rule *rule;
  98
  99         if (!fgets(ln, sizeof(ln), f))
 100             break;
 101
 102         n++;
 103
 104         pa_strip_nl(ln);
 105
 106         if (ln[0] == '#' || !*ln )
 107             continue;
 108
 109         d = ln+strcspn(ln, WHITESPACE);
 110         v = d+strspn(d, WHITESPACE);
 111
 112
 113         if (!*v) {
 114             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words", filename, n);
 115             goto finish;
 116         }
 117
 118         *d = 0;
 119         if (pa_atou(v, &k) < 0) {
 120             pa_log(__FILE__": [%s:%u] failed to parse volume", filename, n);
 121             goto finish;
 122         }
 123
 124         volume = (pa_volume_t) k;
 125
 126
 127         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 128             pa_log(__FILE__": [%s:%u] invalid regular expression", filename, n);
 129             goto finish;
 130         }
 131
 132         rule = pa_xmalloc(sizeof(struct rule));
 133         rule->regex = regex;
 134         rule->volume = volume;
 135         rule->next = NULL;
 136
 137         if (end)
 138             end->next = rule;
 139         else
 140             u->rules = rule;
 141         end = rule;
 142
 143         *d = 0;
 144     }
 145
 146     ret = 0;
 147
 148 finish:
 149     if (f)
 150         fclose(f);
 151
 152     if (fn)
 153         pa_xfree(fn);
 154
 155     return ret;
 156 }
 157
 158 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 159     struct userdata *u =  userdata;
 160     pa_sink_input *si;
 161     struct rule *r;
 162     assert(c && u);
 163
 164     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 165         return;
 166
 167     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 168         return;
 169
 170     if (!si->name)
 171         return;
 172
 173     for (r = u->rules; r; r = r->next) {
 174         if (!regexec(&r->regex, si->name, 0, NULL, 0)) {
 175             pa_cvolume cv;
 176             pa_log_debug(__FILE__": changing volume of sink input '%s' to 0x%03x", si->name, r->volume);
 177             pa_cvolume_set(&cv, r->volume, si->sample_spec.channels);
 178             pa_sink_input_set_volume(si, &cv);
 179         }
 180     }
 181 }
 182
 183 int pa__init(pa_core *c, pa_module*m) {
 184     pa_modargs *ma = NULL;
 185     struct userdata *u;
 186     assert(c && m);
 187
 188     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 189         pa_log(__FILE__": Failed to parse module arguments");
 190         goto fail;
 191     }
 192
 193     u = pa_xmalloc(sizeof(struct userdata));
 194     u->rules = NULL;
 195     u->subscription = NULL;
 196     m->userdata = u;
 197
 198     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 199         goto fail;
 200
 201     u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 202
 203     pa_modargs_free(ma);
 204     return 0;
 205
 206 fail:
 207     pa__done(c, m);
 208
 209     if (ma)
 210         pa_modargs_free(ma);
 211     return  -1;
 212 }
 213
 214 void pa__done(pa_core *c, pa_module*m) {
 215     struct userdata* u;
 216     struct rule *r, *n;
 217     assert(c && m);
 218
 219     if (!(u = m->userdata))
 220         return;
 221
 222     if (u->subscription)
 223         pa_subscription_free(u->subscription);
 224
 225     for (r = u->rules; r; r = n) {
 226         n = r->next;
 227
 228         regfree(&r->regex);
 229         pa_xfree(r);
 230     }
 231
 232     pa_xfree(u);
 233 }
 234
 235