code.delx.au - pulseaudio/blob - 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/sink-input.h>
  47 #include <pulsecore/core-util.h>
  48
  49 #include "module-match-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering");
  52 PA_MODULE_DESCRIPTION("Playback stream expression matching module");
  53 PA_MODULE_VERSION(PACKAGE_VERSION);
  54 PA_MODULE_LOAD_ONCE(true);
  55 PA_MODULE_USAGE("table=<filename> "
  56                 "key=<property_key>");
  57
  58 #define WHITESPACE "\n\r \t"
  59
  60 #define DEFAULT_MATCH_TABLE_FILE PA_DEFAULT_CONFIG_DIR"/match.table"
  61 #define DEFAULT_MATCH_TABLE_FILE_USER "match.table"
  62
  63 #define UPDATE_REPLACE "replace"
  64 #define UPDATE_MERGE "merge"
  65
  66 static const char* const valid_modargs[] = {
  67     "table",
  68     "key",
  69     NULL,
  70 };
  71
  72 struct rule {
  73     regex_t regex;
  74     pa_volume_t volume;
  75     pa_proplist *proplist;
  76     pa_update_mode_t mode;
  77     struct rule *next;
  78 };
  79
  80 struct userdata {
  81     struct rule *rules;
  82     char *property_key;
  83     pa_hook_slot *sink_input_fixate_hook_slot;
  84 };
  85
  86 static int load_rules(struct userdata *u, const char *filename) {
  87     FILE *f;
  88     int n = 0;
  89     int ret = -1;
  90     struct rule *end = NULL;
  91     char *fn = NULL;
  92
  93     pa_assert(u);
  94
  95     if (filename)
  96         f = pa_fopen_cloexec(fn = pa_xstrdup(filename), "r");
  97     else
  98         f = pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn);
  99
 100     if (!f) {
 101         pa_log("Failed to open file config file: %s", pa_cstrerror(errno));
 102         goto finish;
 103     }
 104
 105     pa_lock_fd(fileno(f), 1);
 106
 107     while (!feof(f)) {
 108         char *token_end, *value_str;
 109         pa_volume_t volume = PA_VOLUME_NORM;
 110         uint32_t k;
 111         regex_t regex;
 112         char ln[256];
 113         struct rule *rule;
 114         pa_proplist *proplist = NULL;
 115         pa_update_mode_t mode = (pa_update_mode_t) -1;
 116
 117         if (!fgets(ln, sizeof(ln), f))
 118             break;
 119
 120         n++;
 121
 122         pa_strip_nl(ln);
 123
 124         if (ln[0] == '#' || !*ln )
 125             continue;
 126
 127         token_end = ln + strcspn(ln, WHITESPACE);
 128         value_str = token_end + strspn(token_end, WHITESPACE);
 129         *token_end = 0;
 130
 131         if (!*ln) {
 132             pa_log("[%s:%u] failed to parse line - missing regexp", fn, n);
 133             goto finish;
 134         }
 135
 136         if (!*value_str) {
 137             pa_log("[%s:%u] failed to parse line - too few words", fn, n);
 138             goto finish;
 139         }
 140
 141         if (pa_atou(value_str, &k) >= 0)
 142             volume = (pa_volume_t) PA_CLAMP_VOLUME(k);
 143         else {
 144             size_t len;
 145
 146             token_end = value_str + strcspn(value_str, WHITESPACE);
 147
 148             len = token_end - value_str;
 149             if (len == (sizeof(UPDATE_REPLACE) - 1) && !strncmp(value_str, UPDATE_REPLACE, len))
 150                 mode = PA_UPDATE_REPLACE;
 151             else if (len == (sizeof(UPDATE_MERGE) - 1) && !strncmp(value_str, UPDATE_MERGE, len))
 152                 mode = PA_UPDATE_MERGE;
 153
 154             if (mode != (pa_update_mode_t) -1) {
 155                 value_str = token_end + strspn(token_end, WHITESPACE);
 156
 157                 if (!*value_str) {
 158                     pa_log("[%s:%u] failed to parse line - too few words", fn, n);
 159                     goto finish;
 160                 }
 161             } else
 162                 mode = PA_UPDATE_MERGE;
 163
 164             if (*value_str == '"') {
 165                 value_str++;
 166
 167                 token_end = strchr(value_str, '"');
 168                 if (!token_end) {
 169                     pa_log("[%s:%u] failed to parse line - missing role closing quote", fn, n);
 170                     goto finish;
 171                 }
 172             } else
 173                 token_end = value_str + strcspn(value_str, WHITESPACE);
 174
 175             *token_end = 0;
 176
 177             value_str = pa_sprintf_malloc("media.role=\"%s\"", value_str);
 178             proplist = pa_proplist_from_string(value_str);
 179             pa_xfree(value_str);
 180         }
 181
 182         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 183             pa_log("[%s:%u] invalid regular expression", fn, n);
 184             if (proplist)
 185                 pa_proplist_free(proplist);
 186             goto finish;
 187         }
 188
 189         rule = pa_xnew(struct rule, 1);
 190         rule->regex = regex;
 191         rule->proplist = proplist;
 192         rule->mode = mode;
 193         rule->volume = volume;
 194         rule->next = NULL;
 195
 196         if (end)
 197             end->next = rule;
 198         else
 199             u->rules = rule;
 200         end = rule;
 201     }
 202
 203     ret = 0;
 204
 205 finish:
 206     if (f) {
 207         pa_lock_fd(fileno(f), 0);
 208         fclose(f);
 209     }
 210
 211     pa_xfree(fn);
 212
 213     return ret;
 214 }
 215
 216 static pa_hook_result_t sink_input_fixate_hook_callback(pa_core *c, pa_sink_input_new_data *si, struct userdata *u) {
 217     struct rule *r;
 218     const char *n;
 219
 220     pa_assert(c);
 221     pa_assert(u);
 222
 223     if (!(n = pa_proplist_gets(si->proplist, u->property_key)))
 224         return PA_HOOK_OK;
 225
 226     pa_log_debug("Matching with %s", n);
 227
 228     for (r = u->rules; r; r = r->next) {
 229         if (!regexec(&r->regex, n, 0, NULL, 0)) {
 230             if (r->proplist) {
 231                 pa_log_debug("updating proplist of sink input '%s'", n);
 232                 pa_proplist_update(si->proplist, r->mode, r->proplist);
 233             } else if (si->volume_writable) {
 234                 pa_cvolume cv;
 235                 pa_log_debug("changing volume of sink input '%s' to 0x%03x", n, r->volume);
 236                 pa_cvolume_set(&cv, si->sample_spec.channels, r->volume);
 237                 pa_sink_input_new_data_set_volume(si, &cv);
 238             } else
 239                 pa_log_debug("the volume of sink input '%s' is not writable, can't change it", n);
 240         }
 241     }
 242
 243     return PA_HOOK_OK;
 244 }
 245
 246 int pa__init(pa_module*m) {
 247     pa_modargs *ma = NULL;
 248     struct userdata *u;
 249
 250     pa_assert(m);
 251
 252     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 253         pa_log("Failed to parse module arguments");
 254         goto fail;
 255     }
 256
 257     u = pa_xnew0(struct userdata, 1);
 258     u->rules = NULL;
 259     m->userdata = u;
 260
 261     u->property_key = pa_xstrdup(pa_modargs_get_value(ma, "key", PA_PROP_MEDIA_NAME));
 262
 263     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 264         goto fail;
 265
 266     /* hook EARLY - 1, to match before stream-restore */
 267     u->sink_input_fixate_hook_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_FIXATE], PA_HOOK_EARLY - 1, (pa_hook_cb_t) sink_input_fixate_hook_callback, u);
 268
 269     pa_modargs_free(ma);
 270     return 0;
 271
 272 fail:
 273     pa__done(m);
 274
 275     if (ma)
 276         pa_modargs_free(ma);
 277     return -1;
 278 }
 279
 280 void pa__done(pa_module*m) {
 281     struct userdata* u;
 282     struct rule *r, *n;
 283
 284     pa_assert(m);
 285
 286     if (!(u = m->userdata))
 287         return;
 288
 289     if (u->sink_input_fixate_hook_slot)
 290         pa_hook_slot_free(u->sink_input_fixate_hook_slot);
 291
 292     if (u->property_key)
 293         pa_xfree(u->property_key);
 294
 295     for (r = u->rules; r; r = n) {
 296         n = r->next;
 297
 298         regfree(&r->regex);
 299         if (r->proplist)
 300             pa_proplist_free(r->proplist);
 301         pa_xfree(r);
 302     }
 303
 304     pa_xfree(u);
 305 }