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 #ifndef DEFAULT_CONFIG_DIR
  56 #define DEFAULT_CONFIG_DIR "/etc/pulse"
  57 #endif
  58
  59 #define DEFAULT_MATCH_TABLE_FILE DEFAULT_CONFIG_DIR"/match.table"
  60 #define DEFAULT_MATCH_TABLE_FILE_USER ".pulse/match.table"
  61
  62 static const char* const valid_modargs[] = {
  63     "table",
  64     NULL,
  65 };
  66
  67 struct rule {
  68     regex_t regex;
  69     pa_volume_t volume;
  70     struct rule *next;
  71 };
  72
  73 struct userdata {
  74     struct rule *rules;
  75     pa_subscription *subscription;
  76 };
  77
  78 static int load_rules(struct userdata *u, const char *filename) {
  79     FILE *f;
  80     int n = 0;
  81     int ret = -1;
  82     struct rule *end = NULL;
  83     char *fn = NULL;
  84
  85     f = filename ?
  86         fopen(fn = pa_xstrdup(filename), "r") :
  87         pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn, "r");
  88
  89     if (!f) {
  90         pa_log(__FILE__": failed to open file '%s': %s", fn, 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(__FILE__": [%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(__FILE__": [%s:%u] invalid regular expression", filename, n);
 134             goto finish;
 135         }
 136
 137         rule = pa_xmalloc(sizeof(struct rule));
 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     assert(c && u);
 170
 171     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 172         return;
 173
 174     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 175         return;
 176
 177     if (!si->name)
 178         return;
 179
 180     for (r = u->rules; r; r = r->next) {
 181         if (!regexec(&r->regex, si->name, 0, NULL, 0)) {
 182             pa_cvolume cv;
 183             pa_log_debug(__FILE__": changing volume of sink input '%s' to 0x%03x", si->name, r->volume);
 184             pa_cvolume_set(&cv, r->volume, si->sample_spec.channels);
 185             pa_sink_input_set_volume(si, &cv);
 186         }
 187     }
 188 }
 189
 190 int pa__init(pa_core *c, pa_module*m) {
 191     pa_modargs *ma = NULL;
 192     struct userdata *u;
 193     assert(c && m);
 194
 195     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 196         pa_log(__FILE__": Failed to parse module arguments");
 197         goto fail;
 198     }
 199
 200     u = pa_xmalloc(sizeof(struct userdata));
 201     u->rules = NULL;
 202     u->subscription = NULL;
 203     m->userdata = u;
 204
 205     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 206         goto fail;
 207
 208     u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 209
 210     pa_modargs_free(ma);
 211     return 0;
 212
 213 fail:
 214     pa__done(c, m);
 215
 216     if (ma)
 217         pa_modargs_free(ma);
 218     return  -1;
 219 }
 220
 221 void pa__done(pa_core *c, pa_module*m) {
 222     struct userdata* u;
 223     struct rule *r, *n;
 224     assert(c && m);
 225
 226     if (!(u = m->userdata))
 227         return;
 228
 229     if (u->subscription)
 230         pa_subscription_free(u->subscription);
 231
 232     for (r = u->rules; r; r = n) {
 233         n = r->next;
 234
 235         regfree(&r->regex);
 236         pa_xfree(r);
 237     }
 238
 239     pa_xfree(u);
 240 }
 241
 242