code.delx.au - pulseaudio/blob - src/modules/module-match.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <unistd.h>
  29 #include <assert.h>
  30 #include <string.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33 #include <regex.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/core-util.h>
  42 #include <pulsecore/modargs.h>
  43 #include <pulsecore/log.h>
  44 #include <pulsecore/core-subscribe.h>
  45 #include <pulsecore/sink-input.h>
  46 #include <pulsecore/core-util.h>
  47
  48 #include "module-match-symdef.h"
  49
  50 PA_MODULE_AUTHOR("Lennart Poettering")
  51 PA_MODULE_DESCRIPTION("Playback stream expression matching module")
  52 PA_MODULE_USAGE("table=<filename>")
  53 PA_MODULE_VERSION(PACKAGE_VERSION)
  54
  55 #define WHITESPACE "\n\r \t"
  56
  57 #define DEFAULT_MATCH_TABLE_FILE PA_DEFAULT_CONFIG_DIR"/match.table"
  58 #define DEFAULT_MATCH_TABLE_FILE_USER "match.table"
  59
  60 static const char* const valid_modargs[] = {
  61     "table",
  62     NULL,
  63 };
  64
  65 struct rule {
  66     regex_t regex;
  67     pa_volume_t volume;
  68     struct rule *next;
  69 };
  70
  71 struct userdata {
  72     struct rule *rules;
  73     pa_subscription *subscription;
  74 };
  75
  76 static int load_rules(struct userdata *u, const char *filename) {
  77     FILE *f;
  78     int n = 0;
  79     int ret = -1;
  80     struct rule *end = NULL;
  81     char *fn = NULL;
  82
  83     f = filename ?
  84         fopen(fn = pa_xstrdup(filename), "r") :
  85         pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn, "r");
  86
  87     if (!f) {
  88         pa_log("failed to open file '%s': %s", fn, pa_cstrerror(errno));
  89         goto finish;
  90     }
  91
  92     pa_lock_fd(fileno(f), 1);
  93
  94     while (!feof(f)) {
  95         char *d, *v;
  96         pa_volume_t volume;
  97         uint32_t k;
  98         regex_t regex;
  99         char ln[256];
 100         struct rule *rule;
 101
 102         if (!fgets(ln, sizeof(ln), f))
 103             break;
 104
 105         n++;
 106
 107         pa_strip_nl(ln);
 108
 109         if (ln[0] == '#' || !*ln )
 110             continue;
 111
 112         d = ln+strcspn(ln, WHITESPACE);
 113         v = d+strspn(d, WHITESPACE);
 114
 115
 116         if (!*v) {
 117             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words", filename, n);
 118             goto finish;
 119         }
 120
 121         *d = 0;
 122         if (pa_atou(v, &k) < 0) {
 123             pa_log("[%s:%u] failed to parse volume", filename, n);
 124             goto finish;
 125         }
 126
 127         volume = (pa_volume_t) k;
 128
 129
 130         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 131             pa_log("[%s:%u] invalid regular expression", filename, n);
 132             goto finish;
 133         }
 134
 135         rule = pa_xmalloc(sizeof(struct rule));
 136         rule->regex = regex;
 137         rule->volume = volume;
 138         rule->next = NULL;
 139
 140         if (end)
 141             end->next = rule;
 142         else
 143             u->rules = rule;
 144         end = rule;
 145
 146         *d = 0;
 147     }
 148
 149     ret = 0;
 150
 151 finish:
 152     if (f) {
 153         pa_lock_fd(fileno(f), 0);
 154         fclose(f);
 155     }
 156
 157     if (fn)
 158         pa_xfree(fn);
 159
 160     return ret;
 161 }
 162
 163 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 164     struct userdata *u =  userdata;
 165     pa_sink_input *si;
 166     struct rule *r;
 167     assert(c && u);
 168
 169     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 170         return;
 171
 172     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 173         return;
 174
 175     if (!si->name)
 176         return;
 177
 178     for (r = u->rules; r; r = r->next) {
 179         if (!regexec(&r->regex, si->name, 0, NULL, 0)) {
 180             pa_cvolume cv;
 181             pa_log_debug("changing volume of sink input '%s' to 0x%03x", si->name, r->volume);
 182             pa_cvolume_set(&cv, r->volume, si->sample_spec.channels);
 183             pa_sink_input_set_volume(si, &cv);
 184         }
 185     }
 186 }
 187
 188 int pa__init(pa_core *c, pa_module*m) {
 189     pa_modargs *ma = NULL;
 190     struct userdata *u;
 191     assert(c && m);
 192
 193     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 194         pa_log("Failed to parse module arguments");
 195         goto fail;
 196     }
 197
 198     u = pa_xmalloc(sizeof(struct userdata));
 199     u->rules = NULL;
 200     u->subscription = NULL;
 201     m->userdata = u;
 202
 203     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 204         goto fail;
 205
 206     u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 207
 208     pa_modargs_free(ma);
 209     return 0;
 210
 211 fail:
 212     pa__done(c, m);
 213
 214     if (ma)
 215         pa_modargs_free(ma);
 216     return  -1;
 217 }
 218
 219 void pa__done(pa_core *c, pa_module*m) {
 220     struct userdata* u;
 221     struct rule *r, *n;
 222     assert(c && m);
 223
 224     if (!(u = m->userdata))
 225         return;
 226
 227     if (u->subscription)
 228         pa_subscription_free(u->subscription);
 229
 230     for (r = u->rules; r; r = n) {
 231         n = r->next;
 232
 233         regfree(&r->regex);
 234         pa_xfree(r);
 235     }
 236
 237     pa_xfree(u);
 238 }
 239
 240