src/modules/module-match.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 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 <regex.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33
  34 #include <pulse/xmalloc.h>
  35
  36 #include <pulsecore/core-error.h>
  37 #include <pulsecore/module.h>
  38 #include <pulsecore/core-util.h>
  39 #include <pulsecore/modargs.h>
  40 #include <pulsecore/log.h>
  41 #include <pulsecore/core-subscribe.h>
  42 #include <pulsecore/sink-input.h>
  43 #include <pulsecore/core-util.h>
  44
  45 #include "module-match-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering");
  48 PA_MODULE_DESCRIPTION("Playback stream expression matching module");
  49 PA_MODULE_VERSION(PACKAGE_VERSION);
  50 PA_MODULE_LOAD_ONCE(TRUE);
  51 PA_MODULE_USAGE("table=<filename>");
  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     pa_assert(u);
  82
  83     if (filename)
  84         f = fopen(fn = pa_xstrdup(filename), "r");
  85     else
  86         f = pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn);
  87
  88     if (!f) {
  89         pa_xfree(fn);
  90         pa_log("Failed to open file config file: %s", pa_cstrerror(errno));
  91         goto finish;
  92     }
  93
  94     pa_lock_fd(fileno(f), 1);
  95
  96     while (!feof(f)) {
  97         char *d, *v;
  98         pa_volume_t volume;
  99         uint32_t k;
 100         regex_t regex;
 101         char ln[256];
 102         struct rule *rule;
 103
 104         if (!fgets(ln, sizeof(ln), f))
 105             break;
 106
 107         n++;
 108
 109         pa_strip_nl(ln);
 110
 111         if (ln[0] == '#' || !*ln )
 112             continue;
 113
 114         d = ln+strcspn(ln, WHITESPACE);
 115         v = d+strspn(d, WHITESPACE);
 116
 117
 118         if (!*v) {
 119             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words", filename, n);
 120             goto finish;
 121         }
 122
 123         *d = 0;
 124         if (pa_atou(v, &k) < 0) {
 125             pa_log("[%s:%u] failed to parse volume", filename, n);
 126             goto finish;
 127         }
 128
 129         volume = (pa_volume_t) k;
 130
 131
 132         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 133             pa_log("[%s:%u] invalid regular expression", filename, n);
 134             goto finish;
 135         }
 136
 137         rule = pa_xnew(struct rule, 1);
 138         rule->regex = regex;
 139         rule->volume = volume;
 140         rule->next = NULL;
 141
 142         if (end)
 143             end->next = rule;
 144         else
 145             u->rules = rule;
 146         end = rule;
 147
 148         *d = 0;
 149     }
 150
 151     ret = 0;
 152
 153 finish:
 154     if (f) {
 155         pa_lock_fd(fileno(f), 0);
 156         fclose(f);
 157     }
 158
 159     if (fn)
 160         pa_xfree(fn);
 161
 162     return ret;
 163 }
 164
 165 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 166     struct userdata *u =  userdata;
 167     pa_sink_input *si;
 168     struct rule *r;
 169     const char *n;
 170
 171     pa_assert(c);
 172     pa_assert(u);
 173
 174     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 175         return;
 176
 177     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 178         return;
 179
 180     if (!(n = pa_proplist_gets(si->proplist, PA_PROP_MEDIA_NAME)))
 181         return;
 182
 183     for (r = u->rules; r; r = r->next) {
 184         if (!regexec(&r->regex, n, 0, NULL, 0)) {
 185             pa_cvolume cv;
 186             pa_log_debug("changing volume of sink input '%s' to 0x%03x", n, r->volume);
 187             pa_cvolume_set(&cv, si->sample_spec.channels, r->volume);
 188             pa_sink_input_set_volume(si, &cv);
 189         }
 190     }
 191 }
 192
 193 int pa__init(pa_module*m) {
 194     pa_modargs *ma = NULL;
 195     struct userdata *u;
 196
 197     pa_assert(m);
 198
 199     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 200         pa_log("Failed to parse module arguments");
 201         goto fail;
 202     }
 203
 204     u = pa_xnew(struct userdata, 1);
 205     u->rules = NULL;
 206     u->subscription = NULL;
 207     m->userdata = u;
 208
 209     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 210         goto fail;
 211
 212     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 213
 214     pa_modargs_free(ma);
 215     return 0;
 216
 217 fail:
 218     pa__done(m);
 219
 220     if (ma)
 221         pa_modargs_free(ma);
 222     return  -1;
 223 }
 224
 225 void pa__done(pa_module*m) {
 226     struct userdata* u;
 227     struct rule *r, *n;
 228
 229     pa_assert(m);
 230
 231     if (!(u = m->userdata))
 232         return;
 233
 234     if (u->subscription)
 235         pa_subscription_free(u->subscription);
 236
 237     for (r = u->rules; r; r = n) {
 238         n = r->next;
 239
 240         regfree(&r->regex);
 241         pa_xfree(r);
 242     }
 243
 244     pa_xfree(u);
 245 }