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 <string.h>
  30 #include <errno.h>
  31 #include <sys/types.h>
  32 #include <regex.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35
  36 #include <pulse/xmalloc.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/module.h>
  40 #include <pulsecore/core-util.h>
  41 #include <pulsecore/modargs.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/core-subscribe.h>
  44 #include <pulsecore/sink-input.h>
  45 #include <pulsecore/core-util.h>
  46
  47 #include "module-match-symdef.h"
  48
  49 PA_MODULE_AUTHOR("Lennart Poettering")
  50 PA_MODULE_DESCRIPTION("Playback stream expression matching module")
  51 PA_MODULE_USAGE("table=<filename>")
  52 PA_MODULE_VERSION(PACKAGE_VERSION)
  53
  54 #define WHITESPACE "\n\r \t"
  55
  56 #define DEFAULT_MATCH_TABLE_FILE PA_DEFAULT_CONFIG_DIR"/match.table"
  57 #define DEFAULT_MATCH_TABLE_FILE_USER "match.table"
  58
  59 static const char* const valid_modargs[] = {
  60     "table",
  61     NULL,
  62 };
  63
  64 struct rule {
  65     regex_t regex;
  66     pa_volume_t volume;
  67     struct rule *next;
  68 };
  69
  70 struct userdata {
  71     struct rule *rules;
  72     pa_subscription *subscription;
  73 };
  74
  75 static int load_rules(struct userdata *u, const char *filename) {
  76     FILE *f;
  77     int n = 0;
  78     int ret = -1;
  79     struct rule *end = NULL;
  80     char *fn = NULL;
  81
  82     pa_assert(u);
  83
  84     f = filename ?
  85         fopen(fn = pa_xstrdup(filename), "r") :
  86         pa_open_config_file(DEFAULT_MATCH_TABLE_FILE, DEFAULT_MATCH_TABLE_FILE_USER, NULL, &fn, "r");
  87
  88     if (!f) {
  89         pa_log("failed to open file '%s': %s", fn, pa_cstrerror(errno));
  90         goto finish;
  91     }
  92
  93     pa_lock_fd(fileno(f), 1);
  94
  95     while (!feof(f)) {
  96         char *d, *v;
  97         pa_volume_t volume;
  98         uint32_t k;
  99         regex_t regex;
 100         char ln[256];
 101         struct rule *rule;
 102
 103         if (!fgets(ln, sizeof(ln), f))
 104             break;
 105
 106         n++;
 107
 108         pa_strip_nl(ln);
 109
 110         if (ln[0] == '#' || !*ln )
 111             continue;
 112
 113         d = ln+strcspn(ln, WHITESPACE);
 114         v = d+strspn(d, WHITESPACE);
 115
 116
 117         if (!*v) {
 118             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words", filename, n);
 119             goto finish;
 120         }
 121
 122         *d = 0;
 123         if (pa_atou(v, &k) < 0) {
 124             pa_log("[%s:%u] failed to parse volume", filename, n);
 125             goto finish;
 126         }
 127
 128         volume = (pa_volume_t) k;
 129
 130
 131         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 132             pa_log("[%s:%u] invalid regular expression", filename, n);
 133             goto finish;
 134         }
 135
 136         rule = pa_xnew(struct rule, 1);
 137         rule->regex = regex;
 138         rule->volume = volume;
 139         rule->next = NULL;
 140
 141         if (end)
 142             end->next = rule;
 143         else
 144             u->rules = rule;
 145         end = rule;
 146
 147         *d = 0;
 148     }
 149
 150     ret = 0;
 151
 152 finish:
 153     if (f) {
 154         pa_lock_fd(fileno(f), 0);
 155         fclose(f);
 156     }
 157
 158     if (fn)
 159         pa_xfree(fn);
 160
 161     return ret;
 162 }
 163
 164 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 165     struct userdata *u =  userdata;
 166     pa_sink_input *si;
 167     struct rule *r;
 168
 169     pa_assert(c);
 170     pa_assert(u);
 171
 172     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 173         return;
 174
 175     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 176         return;
 177
 178     if (!si->name)
 179         return;
 180
 181     for (r = u->rules; r; r = r->next) {
 182         if (!regexec(&r->regex, si->name, 0, NULL, 0)) {
 183             pa_cvolume cv;
 184             pa_log_debug("changing volume of sink input '%s' to 0x%03x", si->name, r->volume);
 185             pa_cvolume_set(&cv, si->sample_spec.channels, r->volume);
 186             pa_sink_input_set_volume(si, &cv);
 187         }
 188     }
 189 }
 190
 191 int pa__init(pa_module*m) {
 192     pa_modargs *ma = NULL;
 193     struct userdata *u;
 194
 195     pa_assert(m);
 196
 197     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 198         pa_log("Failed to parse module arguments");
 199         goto fail;
 200     }
 201
 202     u = pa_xnew(struct userdata, 1);
 203     u->rules = NULL;
 204     u->subscription = NULL;
 205     m->userdata = u;
 206
 207     if (load_rules(u, pa_modargs_get_value(ma, "table", NULL)) < 0)
 208         goto fail;
 209
 210     u->subscription = pa_subscription_new(m->core, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 211
 212     pa_modargs_free(ma);
 213     return 0;
 214
 215 fail:
 216     pa__done(m);
 217
 218     if (ma)
 219         pa_modargs_free(ma);
 220     return  -1;
 221 }
 222
 223 void pa__done(pa_module*m) {
 224     struct userdata* u;
 225     struct rule *r, *n;
 226
 227     pa_assert(m);
 228
 229     if (!(u = m->userdata))
 230         return;
 231
 232     if (u->subscription)
 233         pa_subscription_free(u->subscription);
 234
 235     for (r = u->rules; r; r = n) {
 236         n = r->next;
 237
 238         regfree(&r->regex);
 239         pa_xfree(r);
 240     }
 241
 242     pa_xfree(u);
 243 }
 244
 245