code.delx.au - pulseaudio/blob - src/modules/module-detect.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 Lesser 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 Lesser 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 <stdio.h>
  27 #include <assert.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <stdlib.h>
  33
  34 #include <polypcore/module.h>
  35 #include <polypcore/modargs.h>
  36 #include <polypcore/xmalloc.h>
  37 #include <polypcore/log.h>
  38
  39 #include "module-detect-symdef.h"
  40
  41 PA_MODULE_AUTHOR("Lennart Poettering")
  42 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers")
  43 PA_MODULE_VERSION(PACKAGE_VERSION)
  44 PA_MODULE_USAGE("just-one=<boolean>")
  45
  46 static const char *endswith(const char *haystack, const char *needle) {
  47     size_t l, m;
  48     const char *p;
  49
  50     if ((l = strlen(haystack)) < (m = strlen(needle)))
  51         return NULL;
  52
  53     if (strcmp(p = haystack + l - m, needle))
  54         return NULL;
  55
  56     return p;
  57 }
  58
  59 #ifdef HAVE_ALSA
  60 static int detect_alsa(pa_core *c, int just_one) {
  61     FILE *f;
  62     int n = 0, n_sink = 0, n_source = 0;
  63
  64     if (!(f = fopen("/proc/asound/devices", "r"))) {
  65
  66         if (errno != ENOENT)
  67             pa_log_error(__FILE__": open(\"/proc/asound/devices\") failed: %s\n", strerror(errno));
  68
  69         return -1;
  70     }
  71
  72     while (!feof(f)) {
  73         char line[64], args[64];
  74         unsigned device, subdevice;
  75         int is_sink;
  76
  77         if (!fgets(line, sizeof(line), f))
  78             break;
  79
  80         line[strcspn(line, "\r\n")] = 0;
  81
  82         if (endswith(line, "digital audio playback"))
  83             is_sink = 1;
  84         else if (endswith(line, "digital audio capture"))
  85             is_sink = 0;
  86         else
  87             continue;
  88
  89         if (just_one && is_sink && n_sink >= 1)
  90             continue;
  91
  92         if (just_one && !is_sink && n_source >= 1)
  93             continue;
  94
  95         if (sscanf(line, " %*i: [%u- %u]: ", &device, &subdevice) != 2)
  96             continue;
  97
  98         /* Only one sink per device */
  99         if (subdevice != 0)
 100             continue;
 101
 102         snprintf(args, sizeof(args), "device=hw:%u,0", device);
 103         if (!pa_module_load(c, is_sink ? "module-alsa-sink" : "module-alsa-source", args))
 104             continue;
 105
 106         n++;
 107
 108         if (is_sink)
 109             n_sink++;
 110         else
 111             n_source++;
 112     }
 113
 114     fclose(f);
 115
 116     return n;
 117 }
 118 #endif
 119
 120 #ifdef HAVE_OSS
 121 static int detect_oss(pa_core *c, int just_one) {
 122     FILE *f;
 123     int n = 0, b = 0;
 124
 125     if (!(f = fopen("/dev/sndstat", "r")) &&
 126         !(f = fopen("/proc/sndstat", "r")) &&
 127         !(f = fopen("/proc/asound/oss/sndstat", "r"))) {
 128
 129         if (errno != ENOENT)
 130             pa_log_error(__FILE__": failed to open OSS sndstat device: %s\n", strerror(errno));
 131
 132         return -1;
 133     }
 134
 135     while (!feof(f)) {
 136         char line[64], args[64];
 137         unsigned device;
 138
 139         if (!fgets(line, sizeof(line), f))
 140             break;
 141
 142         line[strcspn(line, "\r\n")] = 0;
 143
 144         if (!b) {
 145             b = strcmp(line, "Audio devices:") == 0;
 146             continue;
 147         }
 148
 149         if (line[0] == 0)
 150             break;
 151
 152         if (sscanf(line, "%u: ", &device) != 1)
 153             continue;
 154
 155         if (device == 0)
 156             snprintf(args, sizeof(args), "device=/dev/dsp");
 157         else
 158             snprintf(args, sizeof(args), "device=/dev/dsp%u", device);
 159
 160         if (!pa_module_load(c, "module-oss", args))
 161             continue;
 162
 163         n++;
 164
 165         if (just_one)
 166             break;
 167     }
 168
 169     fclose(f);
 170     return n;
 171 }
 172 #endif
 173
 174 #ifdef HAVE_SOLARIS
 175 static int detect_solaris(pa_core *c, int just_one) {
 176     struct stat s;
 177     const char *dev;
 178     char args[64];
 179
 180     dev = getenv("AUDIODEV");
 181     if (!dev)
 182         dev = "/dev/audio";
 183
 184     if (stat(dev, &s) < 0) {
 185         if (errno != ENOENT)
 186             pa_log_error(__FILE__": failed to open device %s: %s\n", dev, strerror(errno));
 187         return -1;
 188     }
 189
 190     if (!S_ISCHR(s))
 191         return 0;
 192
 193     snprintf(args, sizeof(args), "device=%s", dev);
 194
 195     if (!pa_module_load(c, "module-solaris", args))
 196         return 0;
 197
 198     return 1;
 199 }
 200 #endif
 201
 202 #ifdef OS_IS_WIN32
 203 static int detect_waveout(pa_core *c, int just_one) {
 204     /*
 205      * FIXME: No point in enumerating devices until the plugin supports
 206      * selecting anything but the first.
 207      */
 208     if (!pa_module_load(c, "module-waveout", ""))
 209         return 0;
 210
 211     return 1;
 212 }
 213 #endif
 214
 215 int pa__init(pa_core *c, pa_module*m) {
 216     int just_one = 0, n = 0;
 217     pa_modargs *ma;
 218
 219     static const char* const valid_modargs[] = {
 220         "just-one",
 221         NULL
 222     };
 223
 224     assert(c);
 225     assert(m);
 226
 227     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 228         pa_log(__FILE__": Failed to parse module arguments\n");
 229         goto fail;
 230     }
 231
 232     if (pa_modargs_get_value_boolean(ma, "just-one", &just_one) < 0) {
 233         pa_log(__FILE__": just_one= expects a boolean argument.\n");
 234         goto fail;
 235     }
 236
 237 #if HAVE_ALSA
 238     if ((n = detect_alsa(c, just_one)) <= 0)
 239 #endif
 240 #if HAVE_OSS
 241     if ((n = detect_oss(c, just_one)) <= 0)
 242 #endif
 243 #if HAVE_SOLARIS
 244     if ((n = detect_solaris(c, just_one)) <= 0)
 245 #endif
 246 #if OS_IS_WIN32
 247     if ((n = detect_waveout(c, just_one)) <= 0)
 248 #endif
 249     {
 250         pa_log_warn(__FILE__": failed to detect any sound hardware.\n");
 251         goto fail;
 252     }
 253
 254     pa_log_info(__FILE__": loaded %i modules.\n", n);
 255
 256     /* We were successful and can unload ourselves now. */
 257     pa_module_unload_request(m);
 258
 259     pa_modargs_free(ma);
 260
 261     return 0;
 262
 263 fail:
 264     if (ma)
 265         pa_modargs_free(ma);
 266
 267     return -1;
 268 }
 269
 270
 271 void pa__done(pa_core *c, pa_module*m) {
 272     /* NOP */
 273 }
 274