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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 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 <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 <pulse/xmalloc.h>
  36
  37 #include <pulsecore/core-error.h>
  38 #include <pulsecore/module.h>
  39 #include <pulsecore/core-util.h>
  40 #include <pulsecore/modargs.h>
  41 #include <pulsecore/log.h>
  42 #include <pulsecore/core-subscribe.h>
  43 #include <pulsecore/sink-input.h>
  44 #include <pulsecore/core-util.h>
  45
  46 #include "module-match-symdef.h"
  47
  48 PA_MODULE_AUTHOR("Lennart Poettering")
  49 PA_MODULE_DESCRIPTION("Playback stream expression matching module")
  50 PA_MODULE_USAGE("table=<filename>")
  51 PA_MODULE_VERSION(PACKAGE_VERSION)
  52
  53 #define WHITESPACE "\n\r \t"
  54
  55 #define DEFAULT_MATCH_TABLE_FILE PA_DEFAULT_CONFIG_DIR"/match.table"
  56 #define DEFAULT_MATCH_TABLE_FILE_USER "match.table"
  57
  58 static const char* const valid_modargs[] = {
  59     "table",
  60     NULL,
  61 };
  62
  63 struct rule {
  64     regex_t regex;
  65     pa_volume_t volume;
  66     struct rule *next;
  67 };
  68
  69 struct userdata {
  70     struct rule *rules;
  71     pa_subscription *subscription;
  72 };
  73
  74 static int load_rules(struct userdata *u, const char *filename) {
  75     FILE *f;
  76     int n = 0;
  77     int ret = -1;
  78     struct rule *end = NULL;
  79     char *fn = NULL;
  80
  81     f = filename ?
  82         fopen(fn = pa_xstrdup(filename), "r") :
  83         pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn, "r");
  84
  85     if (!f) {
  86         pa_log(__FILE__": failed to open file '%s': %s", fn, pa_cstrerror(errno));
  87         goto finish;
  88     }
  89
  90     pa_lock_fd(fileno(f), 1);
  91
  92     while (!feof(f)) {
  93         char *d, *v;
  94         pa_volume_t volume;
  95         uint32_t k;
  96         regex_t regex;
  97         char ln[256];
  98         struct rule *rule;
  99
 100         if (!fgets(ln, sizeof(ln), f))
 101             break;
 102
 103         n++;
 104
 105         pa_strip_nl(ln);
 106
 107         if (ln[0] == '#' || !*ln )
 108             continue;
 109
 110         d = ln+strcspn(ln, WHITESPACE);
 111         v = d+strspn(d, WHITESPACE);
 112
 113
 114         if (!*v) {
 115             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words", filename, n);
 116             goto finish;
 117         }
 118
 119         *d = 0;
 120         if (pa_atou(v, &k) < 0) {
 121             pa_log(__FILE__": [%s:%u] failed to parse volume", filename, n);
 122             goto finish;
 123         }
 124
 125         volume = (pa_volume_t) k;
 126
 127
 128         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 129             pa_log(__FILE__": [%s:%u] invalid regular expression", filename, n);
 130             goto finish;
 131         }
 132
 133         rule = pa_xmalloc(sizeof(struct rule));
 134         rule->regex = regex;
 135         rule->volume = volume;
 136         rule->next = NULL;
 137
 138         if (end)
 139             end->next = rule;
 140         else
 141             u->rules = rule;
 142         end = rule;
 143
 144         *d = 0;
 145     }
 146
 147     ret = 0;
 148
 149 finish:
 150     if (f) {
 151         pa_lock_fd(fileno(f), 0);
 152         fclose(f);
 153     }
 154
 155     if (fn)
 156         pa_xfree(fn);
 157
 158     return ret;
 159 }
 160
 161 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 162     struct userdata *u =  userdata;
 163     pa_sink_input *si;
 164     struct rule *r;
 165     assert(c && u);
 166
 167     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 168         return;
 169
 170     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 171         return;
 172
 173     if (!si->name)
 174         return;
 175
 176     for (r = u->rules; r; r = r->next) {
 177         if (!regexec(&r->regex, si->name, 0, NULL, 0)) {
 178             pa_cvolume cv;
 179             pa_log_debug(__FILE__": changing volume of sink input '%s' to 0x%03x", si->name, r->volume);
 180             pa_cvolume_set(&cv, r->volume, si->sample_spec.channels);
 181             pa_sink_input_set_volume(si, &cv);
 182         }
 183     }
 184 }
 185
 186 int pa__init(pa_core *c, pa_module*m) {
 187     pa_modargs *ma = NULL;
 188     struct userdata *u;
 189     assert(c && m);
 190
 191     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 192         pa_log(__FILE__": Failed to parse module arguments");
 193         goto fail;
 194     }
 195
 196     u = pa_xmalloc(sizeof(struct userdata));
 197     u->rules = NULL;
 198     u->subscription = NULL;
 199     m->userdata = u;
 200
 201     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 202         goto fail;
 203
 204     u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 205
 206     pa_modargs_free(ma);
 207     return 0;
 208
 209 fail:
 210     pa__done(c, m);
 211
 212     if (ma)
 213         pa_modargs_free(ma);
 214     return  -1;
 215 }
 216
 217 void pa__done(pa_core *c, pa_module*m) {
 218     struct userdata* u;
 219     struct rule *r, *n;
 220     assert(c && m);
 221
 222     if (!(u = m->userdata))
 223         return;
 224
 225     if (u->subscription)
 226         pa_subscription_free(u->subscription);
 227
 228     for (r = u->rules; r; r = n) {
 229         n = r->next;
 230
 231         regfree(&r->regex);
 232         pa_xfree(r);
 233     }
 234
 235     pa_xfree(u);
 236 }
 237
 238