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 2.1 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
  33 #if defined(HAVE_REGEX_H)
  34 #include <regex.h>
  35 #elif defined(HAVE_PCREPOSIX_H)
  36 #include <pcreposix.h>
  37 #endif
  38
  39 #include <pulse/xmalloc.h>
  40
  41 #include <pulsecore/core-error.h>
  42 #include <pulsecore/module.h>
  43 #include <pulsecore/core-util.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/log.h>
  46 #include <pulsecore/core-subscribe.h>
  47 #include <pulsecore/sink-input.h>
  48 #include <pulsecore/core-util.h>
  49
  50 #include "module-match-symdef.h"
  51
  52 PA_MODULE_AUTHOR("Lennart Poettering");
  53 PA_MODULE_DESCRIPTION("Playback stream expression matching module");
  54 PA_MODULE_VERSION(PACKAGE_VERSION);
  55 PA_MODULE_LOAD_ONCE(TRUE);
  56 PA_MODULE_USAGE("table=<filename> "
  57                 "key=<property_key>");
  58
  59 #define WHITESPACE "\n\r \t"
  60
  61 #define DEFAULT_MATCH_TABLE_FILE PA_DEFAULT_CONFIG_DIR"/match.table"
  62 #define DEFAULT_MATCH_TABLE_FILE_USER "match.table"
  63
  64 static const char* const valid_modargs[] = {
  65     "table",
  66     "key",
  67     NULL,
  68 };
  69
  70 struct rule {
  71     regex_t regex;
  72     pa_volume_t volume;
  73     pa_proplist *proplist;
  74     struct rule *next;
  75 };
  76
  77 struct userdata {
  78     struct rule *rules;
  79     char *property_key;
  80     pa_subscription *subscription;
  81 };
  82
  83 static int load_rules(struct userdata *u, const char *filename) {
  84     FILE *f;
  85     int n = 0;
  86     int ret = -1;
  87     struct rule *end = NULL;
  88     char *fn = NULL;
  89
  90     pa_assert(u);
  91
  92     if (filename)
  93         f = pa_fopen_cloexec(fn = pa_xstrdup(filename), "r");
  94     else
  95         f = pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn);
  96
  97     if (!f) {
  98         pa_xfree(fn);
  99         pa_log("Failed to open file config file: %s", pa_cstrerror(errno));
 100         goto finish;
 101     }
 102
 103     pa_lock_fd(fileno(f), 1);
 104
 105     while (!feof(f)) {
 106         char *d, *v;
 107         pa_volume_t volume = PA_VOLUME_NORM;
 108         uint32_t k;
 109         regex_t regex;
 110         char ln[256];
 111         struct rule *rule;
 112         pa_proplist *proplist = NULL;
 113
 114         if (!fgets(ln, sizeof(ln), f))
 115             break;
 116
 117         n++;
 118
 119         pa_strip_nl(ln);
 120
 121         if (ln[0] == '#' || !*ln )
 122             continue;
 123
 124         d = ln+strcspn(ln, WHITESPACE);
 125         v = d+strspn(d, WHITESPACE);
 126
 127
 128         if (!*v) {
 129             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words", filename, n);
 130             goto finish;
 131         }
 132
 133         *d = 0;
 134         if (pa_atou(v, &k) >= 0) {
 135             volume = (pa_volume_t) PA_CLAMP_VOLUME(k);
 136         } else if (*v == '"') {
 137             char *e;
 138
 139             e = strchr(v+1, '"');
 140             if (!e) {
 141                 pa_log(__FILE__ ": [%s:%u] failed to parse line - missing role closing quote", filename, n);
 142                 goto finish;
 143             }
 144
 145             *e = '\0';
 146             e = pa_sprintf_malloc("media.role=\"%s\"", v+1);
 147             proplist = pa_proplist_from_string(e);
 148             pa_xfree(e);
 149         } else {
 150             char *e;
 151
 152             e = v+strspn(v, WHITESPACE);
 153             if (!*e) {
 154                 pa_log(__FILE__ ": [%s:%u] failed to parse line - missing end of property list", filename, n);
 155                 goto finish;
 156             }
 157             *e = '\0';
 158             proplist = pa_proplist_from_string(v);
 159         }
 160
 161         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 162             pa_log("[%s:%u] invalid regular expression", filename, n);
 163             goto finish;
 164         }
 165
 166         rule = pa_xnew(struct rule, 1);
 167         rule->regex = regex;
 168         rule->proplist = proplist;
 169         rule->volume = volume;
 170         rule->next = NULL;
 171
 172         if (end)
 173             end->next = rule;
 174         else
 175             u->rules = rule;
 176         end = rule;
 177
 178         *d = 0;
 179     }
 180
 181     ret = 0;
 182
 183 finish:
 184     if (f) {
 185         pa_lock_fd(fileno(f), 0);
 186         fclose(f);
 187     }
 188
 189     if (fn)
 190         pa_xfree(fn);
 191
 192     return ret;
 193 }
 194
 195 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 196     struct userdata *u =  userdata;
 197     pa_sink_input *si;
 198     struct rule *r;
 199     const char *n;
 200
 201     pa_assert(c);
 202     pa_assert(u);
 203
 204     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 205         return;
 206
 207     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 208         return;
 209
 210     if (!(n = pa_proplist_gets(si->proplist, u->property_key)))
 211         return;
 212
 213     pa_log_debug("Matching with %s", n);
 214
 215     for (r = u->rules; r; r = r->next) {
 216         if (!regexec(&r->regex, n, 0, NULL, 0)) {
 217             if (r->proplist) {
 218                 pa_log_debug("updating proplist of sink input '%s'", n);
 219                 pa_proplist_update(si->proplist, PA_UPDATE_MERGE, r->proplist);
 220             } else {
 221                 pa_cvolume cv;
 222                 pa_log_debug("changing volume of sink input '%s' to 0x%03x", n, r->volume);
 223                 pa_cvolume_set(&cv, si->sample_spec.channels, r->volume);
 224                 pa_sink_input_set_volume(si, &cv, TRUE, FALSE);
 225             }
 226         }
 227     }
 228 }
 229
 230 int pa__init(pa_module*m) {
 231     pa_modargs *ma = NULL;
 232     struct userdata *u;
 233
 234     pa_assert(m);
 235
 236     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 237         pa_log("Failed to parse module arguments");
 238         goto fail;
 239     }
 240
 241     u = pa_xnew(struct userdata, 1);
 242     u->rules = NULL;
 243     u->subscription = NULL;
 244     m->userdata = u;
 245
 246     u->property_key = pa_xstrdup(pa_modargs_get_value(ma, "key", PA_PROP_MEDIA_NAME));
 247
 248     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 249         goto fail;
 250
 251     /* FIXME: Doing this asynchronously is just broken. This needs to
 252      * use a hook! */
 253
 254     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 255
 256     pa_modargs_free(ma);
 257     return 0;
 258
 259 fail:
 260     pa__done(m);
 261
 262     if (ma)
 263         pa_modargs_free(ma);
 264     return -1;
 265 }
 266
 267 void pa__done(pa_module*m) {
 268     struct userdata* u;
 269     struct rule *r, *n;
 270
 271     pa_assert(m);
 272
 273     if (!(u = m->userdata))
 274         return;
 275
 276     if (u->subscription)
 277         pa_subscription_free(u->subscription);
 278
 279     if (u->property_key)
 280         pa_xfree(u->property_key);
 281
 282     for (r = u->rules; r; r = n) {
 283         n = r->next;
 284
 285         regfree(&r->regex);
 286         if (r->proplist)
 287             pa_proplist_free(r->proplist);
 288         pa_xfree(r);
 289     }
 290
 291     pa_xfree(u);
 292 }