code.delx.au - pulseaudio/blob - polyp/module-match.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio 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 General Public License
  17   along with polypaudio; 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 <assert.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31 #include <regex.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34
  35 #include "module.h"
  36 #include "util.h"
  37 #include "modargs.h"
  38 #include "log.h"
  39 #include "subscribe.h"
  40 #include "xmalloc.h"
  41 #include "sink-input.h"
  42 #include "module-match-symdef.h"
  43
  44 PA_MODULE_AUTHOR("Lennart Poettering")
  45 PA_MODULE_DESCRIPTION("Sink input matching module")
  46 PA_MODULE_USAGE("table=<filename>")
  47 PA_MODULE_VERSION(PACKAGE_VERSION)
  48
  49 #define WHITESPACE "\n\r \t"
  50
  51 static const char* const valid_modargs[] = {
  52     "table",
  53     NULL,
  54 };
  55
  56 struct rule {
  57     regex_t regex;
  58     pa_volume_t volume;
  59     struct rule *next;
  60 };
  61
  62 struct userdata {
  63     struct rule *rules;
  64     struct pa_subscription *subscription;
  65 };
  66
  67 static int load_rules(struct userdata *u, const char *filename) {
  68     FILE *f;
  69     int n = 0;
  70     int ret = -1;
  71     struct rule *end = NULL;
  72
  73     if (!(f = fopen(filename, "r"))) {
  74         pa_log(__FILE__": failed to open file '%s': %s\n", filename, strerror(errno));
  75         goto finish;
  76     }
  77
  78     while (!feof(f)) {
  79         char *d, *v, *e = NULL;
  80         pa_volume_t volume;
  81         regex_t regex;
  82         char ln[256];
  83         struct rule *rule;
  84
  85         if (!fgets(ln, sizeof(ln), f))
  86             break;
  87
  88         n++;
  89
  90         pa_strip_nl(ln);
  91
  92         if (ln[0] == '#' || !*ln )
  93             continue;
  94
  95         d = ln+strcspn(ln, WHITESPACE);
  96         v = d+strspn(d, WHITESPACE);
  97
  98
  99         if (!*v) {
 100             pa_log(__FILE__ ": [%s:%u] failed to parse line - too few words\n", filename, n);
 101             goto finish;
 102         }
 103
 104         *d = 0;
 105
 106         volume = (pa_volume_t) strtol(v, &e, 0);
 107
 108         if (!e || *e) {
 109             pa_log(__FILE__": [%s:%u] failed to parse volume\n", filename, n);
 110             goto finish;
 111         }
 112
 113         if (regcomp(&regex, ln, REG_EXTENDED|REG_NOSUB) != 0) {
 114             pa_log(__FILE__": [%s:%u] invalid regular expression\n", filename, n);
 115             goto finish;
 116         }
 117
 118         rule = pa_xmalloc(sizeof(struct rule));
 119         rule->regex = regex;
 120         rule->volume = volume;
 121         rule->next = NULL;
 122
 123         if (end)
 124             end->next = rule;
 125         else
 126             u->rules = rule;
 127         end = rule;
 128
 129         *d = 0;
 130     }
 131
 132     ret = 0;
 133
 134 finish:
 135     if (f)
 136         fclose(f);
 137
 138     return ret;
 139 }
 140
 141 static void callback(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata) {
 142     struct userdata *u =  userdata;
 143     struct pa_sink_input *si;
 144     struct rule *r;
 145     assert(c && u);
 146
 147     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW))
 148         return;
 149
 150     if (!(si = pa_idxset_get_by_index(c->sink_inputs, index))) {
 151         pa_log(__FILE__": WARNING: failed to get sink input\n");
 152         return;
 153     }
 154
 155     if (!si->name)
 156         return;
 157
 158     for (r = u->rules; r; r = r->next) {
 159         if (!regexec(&r->regex, si->name, 0, NULL, 0)) {
 160             pa_log(__FILE__": changing volume of sink input '%s' to 0x%03x\n", si->name, r->volume);
 161             pa_sink_input_set_volume(si, r->volume);
 162         }
 163     }
 164 }
 165
 166 int pa__init(struct pa_core *c, struct pa_module*m) {
 167     struct pa_modargs *ma = NULL;
 168     const char *table_file;
 169     struct userdata *u;
 170     assert(c && m);
 171
 172     if (!(ma = pa_modargs_new(m->argument, valid_modargs)) ||
 173         !(table_file = pa_modargs_get_value(ma, "table", NULL))) {
 174         pa_log(__FILE__": Failed to parse module arguments\n");
 175         goto fail;
 176     }
 177
 178     u = pa_xmalloc(sizeof(struct userdata));
 179     u->rules = NULL;
 180     u->subscription = NULL;
 181     m->userdata = u;
 182
 183     if (load_rules(u, table_file) < 0)
 184         goto fail;
 185
 186     u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 187
 188     pa_modargs_free(ma);
 189     return 0;
 190
 191 fail:
 192     pa__done(c, m);
 193
 194     if (ma)
 195         pa_modargs_free(ma);
 196     return  -1;
 197 }
 198
 199 void pa__done(struct pa_core *c, struct pa_module*m) {
 200     struct userdata* u;
 201     struct rule *r, *n;
 202     assert(c && m);
 203
 204     if (!(u = m->userdata))
 205         return;
 206
 207     if (u->subscription)
 208         pa_subscription_free(u->subscription);
 209
 210     for (r = u->rules; r; r = n) {
 211         n = r->next;
 212
 213         regfree(&r->regex);
 214         pa_xfree(r);
 215     }
 216
 217     pa_xfree(u);
 218 }
 219
 220