src/modules/module-augment-properties.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 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 <sys/stat.h>
  27 #include <dirent.h>
  28
  29 #include <pulse/xmalloc.h>
  30 #include <pulse/volume.h>
  31 #include <pulse/channelmap.h>
  32
  33 #include <pulsecore/core-error.h>
  34 #include <pulsecore/module.h>
  35 #include <pulsecore/core-util.h>
  36 #include <pulsecore/modargs.h>
  37 #include <pulsecore/log.h>
  38 #include <pulsecore/client.h>
  39 #include <pulsecore/conf-parser.h>
  40
  41 #include "module-augment-properties-symdef.h"
  42
  43 PA_MODULE_AUTHOR("Lennart Poettering");
  44 PA_MODULE_DESCRIPTION("Augment the property sets of streams with additional static information");
  45 PA_MODULE_VERSION(PACKAGE_VERSION);
  46 PA_MODULE_LOAD_ONCE(TRUE);
  47
  48 #define STAT_INTERVAL 30
  49 #define MAX_CACHE_SIZE 50
  50
  51 static const char* const valid_modargs[] = {
  52     NULL
  53 };
  54
  55 struct rule {
  56     time_t timestamp;
  57     pa_bool_t good;
  58     time_t mtime;
  59     char *process_name;
  60     char *application_name;
  61     char *icon_name;
  62     char *role;
  63     pa_proplist *proplist;
  64 };
  65
  66 struct userdata {
  67     pa_hashmap *cache;
  68     pa_hook_slot *client_new_slot, *client_proplist_changed_slot;
  69 };
  70
  71 static void rule_free(struct rule *r) {
  72     pa_assert(r);
  73
  74     pa_xfree(r->process_name);
  75     pa_xfree(r->application_name);
  76     pa_xfree(r->icon_name);
  77     pa_xfree(r->role);
  78     if (r->proplist)
  79         pa_proplist_free(r->proplist);
  80     pa_xfree(r);
  81 }
  82
  83 static int parse_properties(
  84         const char *filename,
  85         unsigned line,
  86         const char *section,
  87         const char *lvalue,
  88         const char *rvalue,
  89         void *data,
  90         void *userdata) {
  91
  92     struct rule *r = userdata;
  93     pa_proplist *n;
  94
  95     if (!(n = pa_proplist_from_string(rvalue)))
  96         return -1;
  97
  98     if (r->proplist) {
  99         pa_proplist_update(r->proplist, PA_UPDATE_MERGE, n);
 100         pa_proplist_free(n);
 101     } else
 102         r->proplist = n;
 103
 104     return 0;
 105 }
 106
 107 static int parse_categories(
 108         const char *filename,
 109         unsigned line,
 110         const char *section,
 111         const char *lvalue,
 112         const char *rvalue,
 113         void *data,
 114         void *userdata) {
 115
 116     struct rule *r = userdata;
 117     const char *state = NULL;
 118     char *c;
 119
 120     while ((c = pa_split(rvalue, ";", &state))) {
 121
 122         if (pa_streq(c, "Game")) {
 123             pa_xfree(r->role);
 124             r->role = pa_xstrdup("game");
 125         } else if (pa_streq(c, "Telephony")) {
 126             pa_xfree(r->role);
 127             r->role = pa_xstrdup("phone");
 128         }
 129
 130         pa_xfree(c);
 131     }
 132
 133     return 0;
 134 }
 135
 136 static int check_type(
 137         const char *filename,
 138         unsigned line,
 139         const char *section,
 140         const char *lvalue,
 141         const char *rvalue,
 142         void *data,
 143         void *userdata) {
 144
 145     return pa_streq(rvalue, "Application") ? 0 : -1;
 146 }
 147
 148 static int catch_all(
 149         const char *filename,
 150         unsigned line,
 151         const char *section,
 152         const char *lvalue,
 153         const char *rvalue,
 154         void *data,
 155         void *userdata) {
 156
 157     return 0;
 158 }
 159
 160 static void update_rule(struct rule *r) {
 161     char *fn;
 162     struct stat st;
 163     static pa_config_item table[] = {
 164         { "Name", pa_config_parse_string,              NULL, "Desktop Entry" },
 165         { "Icon", pa_config_parse_string,              NULL, "Desktop Entry" },
 166         { "Type", check_type,                          NULL, "Desktop Entry" },
 167         { "X-PulseAudio-Properties", parse_properties, NULL, "Desktop Entry" },
 168         { "Categories", parse_categories,              NULL, "Desktop Entry" },
 169         { NULL,  catch_all, NULL, NULL },
 170         { NULL, NULL, NULL, NULL },
 171     };
 172     pa_bool_t found = FALSE;
 173
 174     pa_assert(r);
 175     fn = pa_sprintf_malloc(DESKTOPFILEDIR PA_PATH_SEP "%s.desktop", r->process_name);
 176
 177     if (stat(fn, &st) == 0)
 178         found = TRUE;
 179     else {
 180         DIR *desktopfiles_dir;
 181         struct dirent *dir;
 182
 183         /* Let's try a more aggressive search, but only one level */
 184         if ((desktopfiles_dir = opendir(DESKTOPFILEDIR))) {
 185             while ((dir = readdir(desktopfiles_dir))) {
 186                 if (dir->d_type != DT_DIR
 187                     || strcmp(dir->d_name, ".") == 0
 188                     || strcmp(dir->d_name, "..") == 0)
 189                     continue;
 190
 191                 pa_xfree(fn);
 192                 fn = pa_sprintf_malloc(DESKTOPFILEDIR
 193                                        PA_PATH_SEP "%s" PA_PATH_SEP "%s.desktop",
 194                                        dir->d_name, r->process_name);
 195
 196                 if (stat(fn, &st) == 0) {
 197                     found = TRUE;
 198                     break;
 199                 }
 200             }
 201             closedir(desktopfiles_dir);
 202         }
 203     }
 204     if (!found) {
 205         r->good = FALSE;
 206         pa_xfree(fn);
 207         return;
 208     }
 209
 210     if (r->good) {
 211         if (st.st_mtime == r->mtime) {
 212             /* Theoretically the filename could have changed, but if so
 213                having the same mtime is very unlikely so not worth tracking it in r */
 214             pa_xfree(fn);
 215             return;
 216         }
 217         pa_log_debug("Found %s (which has been updated since we last checked).", fn);
 218     } else
 219         pa_log_debug("Found %s.", fn);
 220
 221     r->good = TRUE;
 222     r->mtime = st.st_mtime;
 223     pa_xfree(r->application_name);
 224     pa_xfree(r->icon_name);
 225     pa_xfree(r->role);
 226     r->application_name = r->icon_name = r->role = NULL;
 227     if (r->proplist)
 228         pa_proplist_clear(r->proplist);
 229
 230     table[0].data = &r->application_name;
 231     table[1].data = &r->icon_name;
 232
 233     if (pa_config_parse(fn, NULL, table, r) < 0)
 234         pa_log_warn("Failed to parse .desktop file %s.", fn);
 235
 236     pa_xfree(fn);
 237 }
 238
 239 static void apply_rule(struct rule *r, pa_proplist *p) {
 240     pa_assert(r);
 241     pa_assert(p);
 242
 243     if (!r->good)
 244         return;
 245
 246     if (r->proplist)
 247         pa_proplist_update(p, PA_UPDATE_MERGE, r->proplist);
 248
 249     if (r->icon_name)
 250         if (!pa_proplist_contains(p, PA_PROP_APPLICATION_ICON_NAME))
 251             pa_proplist_sets(p, PA_PROP_APPLICATION_ICON_NAME, r->icon_name);
 252
 253     if (r->application_name) {
 254         const char *t;
 255
 256         t = pa_proplist_gets(p, PA_PROP_APPLICATION_NAME);
 257
 258         if (!t || pa_streq(t, r->process_name))
 259             pa_proplist_sets(p, PA_PROP_APPLICATION_NAME, r->application_name);
 260     }
 261
 262     if (r->role)
 263         if (!pa_proplist_contains(p, PA_PROP_MEDIA_ROLE))
 264             pa_proplist_sets(p, PA_PROP_MEDIA_ROLE, r->role);
 265 }
 266
 267 static void make_room(pa_hashmap *cache) {
 268     pa_assert(cache);
 269
 270     while (pa_hashmap_size(cache) >= MAX_CACHE_SIZE) {
 271         struct rule *r;
 272
 273         pa_assert_se(r = pa_hashmap_steal_first(cache));
 274         rule_free(r);
 275     }
 276 }
 277
 278 static pa_hook_result_t process(struct userdata *u, pa_proplist *p) {
 279     struct rule *r;
 280     time_t now;
 281     const char *pn;
 282
 283     pa_assert(u);
 284     pa_assert(p);
 285
 286     if (!(pn = pa_proplist_gets(p, PA_PROP_APPLICATION_PROCESS_BINARY)))
 287         return PA_HOOK_OK;
 288
 289     if (*pn == '.' || strchr(pn, '/'))
 290         return PA_HOOK_OK;
 291
 292     time(&now);
 293
 294     pa_log_debug("Looking for .desktop file for %s", pn);
 295
 296     if ((r = pa_hashmap_get(u->cache, pn))) {
 297         if (now-r->timestamp > STAT_INTERVAL) {
 298             r->timestamp = now;
 299             update_rule(r);
 300         }
 301     } else {
 302         make_room(u->cache);
 303
 304         r = pa_xnew0(struct rule, 1);
 305         r->process_name = pa_xstrdup(pn);
 306         r->timestamp = now;
 307         pa_hashmap_put(u->cache, r->process_name, r);
 308         update_rule(r);
 309     }
 310
 311     apply_rule(r, p);
 312     return PA_HOOK_OK;
 313 }
 314
 315 static pa_hook_result_t client_new_cb(pa_core *core, pa_client_new_data *data, struct userdata *u) {
 316     pa_core_assert_ref(core);
 317     pa_assert(data);
 318     pa_assert(u);
 319
 320     return process(u, data->proplist);
 321 }
 322
 323 static pa_hook_result_t client_proplist_changed_cb(pa_core *core, pa_client *client, struct userdata *u) {
 324     pa_core_assert_ref(core);
 325     pa_assert(client);
 326     pa_assert(u);
 327
 328     return process(u, client->proplist);
 329 }
 330
 331 int pa__init(pa_module *m) {
 332     pa_modargs *ma = NULL;
 333     struct userdata *u;
 334
 335     pa_assert(m);
 336
 337     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 338         pa_log("Failed to parse module arguments");
 339         goto fail;
 340     }
 341
 342     m->userdata = u = pa_xnew(struct userdata, 1);
 343
 344     u->cache = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 345     u->client_new_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_CLIENT_NEW], PA_HOOK_EARLY, (pa_hook_cb_t) client_new_cb, u);
 346     u->client_proplist_changed_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_CLIENT_PROPLIST_CHANGED], PA_HOOK_EARLY, (pa_hook_cb_t) client_proplist_changed_cb, u);
 347
 348     pa_modargs_free(ma);
 349
 350     return 0;
 351
 352 fail:
 353     pa__done(m);
 354
 355     if (ma)
 356         pa_modargs_free(ma);
 357
 358     return  -1;
 359 }
 360
 361 void pa__done(pa_module *m) {
 362     struct userdata* u;
 363
 364     pa_assert(m);
 365
 366     if (!(u = m->userdata))
 367         return;
 368
 369     if (u->client_new_slot)
 370         pa_hook_slot_free(u->client_new_slot);
 371     if (u->client_proplist_changed_slot)
 372         pa_hook_slot_free(u->client_proplist_changed_slot);
 373
 374     if (u->cache) {
 375         struct rule *r;
 376
 377         while ((r = pa_hashmap_steal_first(u->cache)))
 378             rule_free(r);
 379
 380         pa_hashmap_free(u->cache, NULL, NULL);
 381     }
 382
 383     pa_xfree(u);
 384 }