code.delx.au - pulseaudio/blob - src/modules/oss-util.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <sys/soundcard.h>
  30 #include <sys/ioctl.h>
  31 #include <stdio.h>
  32 #include <errno.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <fcntl.h>
  38
  39 #include <pulse/xmalloc.h>
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/core-util.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/macro.h>
  44
  45 #include "oss-util.h"
  46
  47 int pa_oss_open(const char *device, int *mode, int* pcaps) {
  48     int fd = -1;
  49     int caps;
  50
  51     pa_assert(device);
  52     pa_assert(mode);
  53     pa_assert(*mode == O_RDWR || *mode == O_RDONLY || *mode == O_WRONLY);
  54
  55     if(!pcaps)
  56         pcaps = &caps;
  57
  58     if (*mode == O_RDWR) {
  59         if ((fd = open(device, O_RDWR|O_NDELAY|O_NOCTTY)) >= 0) {
  60             ioctl(fd, SNDCTL_DSP_SETDUPLEX, 0);
  61
  62             if (ioctl(fd, SNDCTL_DSP_GETCAPS, pcaps) < 0) {
  63                 pa_log("SNDCTL_DSP_GETCAPS: %s", pa_cstrerror(errno));
  64                 goto fail;
  65             }
  66
  67             if (*pcaps & DSP_CAP_DUPLEX)
  68                 goto success;
  69
  70             pa_log_warn("'%s' doesn't support full duplex", device);
  71
  72             pa_close(fd);
  73         }
  74
  75         if ((fd = open(device, (*mode = O_WRONLY)|O_NDELAY|O_NOCTTY)) < 0) {
  76             if ((fd = open(device, (*mode = O_RDONLY)|O_NDELAY|O_NOCTTY)) < 0) {
  77                 pa_log("open('%s'): %s", device, pa_cstrerror(errno));
  78                 goto fail;
  79             }
  80         }
  81     } else {
  82         if ((fd = open(device, *mode|O_NDELAY|O_NOCTTY)) < 0) {
  83             pa_log("open('%s'): %s", device, pa_cstrerror(errno));
  84             goto fail;
  85         }
  86     }
  87
  88     *pcaps = 0;
  89
  90     if (ioctl(fd, SNDCTL_DSP_GETCAPS, pcaps) < 0) {
  91         pa_log("SNDCTL_DSP_GETCAPS: %s", pa_cstrerror(errno));
  92         goto fail;
  93     }
  94
  95 success:
  96
  97     pa_log_debug("capabilities:%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
  98                  *pcaps & DSP_CAP_BATCH ? " BATCH" : "",
  99 #ifdef DSP_CAP_BIND
 100                  *pcaps & DSP_CAP_BIND ? " BIND" : "",
 101 #else
 102                  "",
 103 #endif
 104                  *pcaps & DSP_CAP_COPROC ? " COPROC" : "",
 105                  *pcaps & DSP_CAP_DUPLEX ? " DUPLEX" : "",
 106 #ifdef DSP_CAP_FREERATE
 107                  *pcaps & DSP_CAP_FREERATE ? " FREERATE" : "",
 108 #else
 109                  "",
 110 #endif
 111 #ifdef DSP_CAP_INPUT
 112                  *pcaps & DSP_CAP_INPUT ? " INPUT" : "",
 113 #else
 114                  "",
 115 #endif
 116                  *pcaps & DSP_CAP_MMAP ? " MMAP" : "",
 117 #ifdef DSP_CAP_MODEM
 118                  *pcaps & DSP_CAP_MODEM ? " MODEM" : "",
 119 #else
 120                  "",
 121 #endif
 122 #ifdef DSP_CAP_MULTI
 123                  *pcaps & DSP_CAP_MULTI ? " MULTI" : "",
 124 #else
 125                  "",
 126 #endif
 127 #ifdef DSP_CAP_OUTPUT
 128                  *pcaps & DSP_CAP_OUTPUT ? " OUTPUT" : "",
 129 #else
 130                  "",
 131 #endif
 132                  *pcaps & DSP_CAP_REALTIME ? " REALTIME" : "",
 133 #ifdef DSP_CAP_SHADOW
 134                  *pcaps & DSP_CAP_SHADOW ? " SHADOW" : "",
 135 #else
 136                  "",
 137 #endif
 138 #ifdef DSP_CAP_VIRTUAL
 139                  *pcaps & DSP_CAP_VIRTUAL ? " VIRTUAL" : "",
 140 #else
 141                  "",
 142 #endif
 143                  *pcaps & DSP_CAP_TRIGGER ? " TRIGGER" : "");
 144
 145     pa_make_fd_cloexec(fd);
 146
 147     return fd;
 148
 149 fail:
 150     if (fd >= 0)
 151         pa_close(fd);
 152     return -1;
 153 }
 154
 155 int pa_oss_auto_format(int fd, pa_sample_spec *ss) {
 156     int format, channels, speed, reqformat;
 157     pa_sample_format_t orig_format;
 158
 159     static const int format_trans[PA_SAMPLE_MAX] = {
 160         [PA_SAMPLE_U8] = AFMT_U8,
 161         [PA_SAMPLE_ALAW] = AFMT_A_LAW,
 162         [PA_SAMPLE_ULAW] = AFMT_MU_LAW,
 163         [PA_SAMPLE_S16LE] = AFMT_S16_LE,
 164         [PA_SAMPLE_S16BE] = AFMT_S16_BE,
 165         [PA_SAMPLE_FLOAT32LE] = AFMT_QUERY, /* not supported */
 166         [PA_SAMPLE_FLOAT32BE] = AFMT_QUERY, /* not supported */
 167         [PA_SAMPLE_S32LE] = AFMT_QUERY, /* not supported */
 168         [PA_SAMPLE_S32BE] = AFMT_QUERY, /* not supported */
 169     };
 170
 171     pa_assert(fd >= 0);
 172     pa_assert(ss);
 173
 174     orig_format = ss->format;
 175
 176     reqformat = format = format_trans[ss->format];
 177     if (reqformat == AFMT_QUERY || ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != reqformat) {
 178         format = AFMT_S16_NE;
 179         if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_S16_NE) {
 180             int f = AFMT_S16_NE == AFMT_S16_LE ? AFMT_S16_BE : AFMT_S16_LE;
 181             format = f;
 182             if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != f) {
 183                 format = AFMT_U8;
 184                 if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_U8) {
 185                     pa_log("SNDCTL_DSP_SETFMT: %s", format != AFMT_U8 ? "No supported sample format" : pa_cstrerror(errno));
 186                     return -1;
 187                 } else
 188                     ss->format = PA_SAMPLE_U8;
 189             } else
 190                 ss->format = f == AFMT_S16_LE ? PA_SAMPLE_S16LE : PA_SAMPLE_S16BE;
 191         } else
 192             ss->format = PA_SAMPLE_S16NE;
 193     }
 194
 195     if (orig_format != ss->format)
 196         pa_log_warn("device doesn't support sample format %s, changed to %s.",
 197                pa_sample_format_to_string(orig_format),
 198                pa_sample_format_to_string(ss->format));
 199
 200     channels = ss->channels;
 201     if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
 202         pa_log("SNDCTL_DSP_CHANNELS: %s", pa_cstrerror(errno));
 203         return -1;
 204     }
 205     pa_assert(channels > 0);
 206
 207     if (ss->channels != channels) {
 208         pa_log_warn("device doesn't support %i channels, using %i channels.", ss->channels, channels);
 209         ss->channels = channels;
 210     }
 211
 212     speed = ss->rate;
 213     if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
 214         pa_log("SNDCTL_DSP_SPEED: %s", pa_cstrerror(errno));
 215         return -1;
 216     }
 217     pa_assert(speed > 0);
 218
 219     if (ss->rate != (unsigned) speed) {
 220         pa_log_warn("device doesn't support %i Hz, changed to %i Hz.", ss->rate, speed);
 221
 222         /* If the sample rate deviates too much, we need to resample */
 223         if (speed < ss->rate*.95 || speed > ss->rate*1.05)
 224             ss->rate = speed;
 225     }
 226
 227     return 0;
 228 }
 229
 230 static int simple_log2(int v) {
 231     int k = 0;
 232
 233     for (;;) {
 234         v >>= 1;
 235         if (!v) break;
 236         k++;
 237     }
 238
 239     return k;
 240 }
 241
 242 int pa_oss_set_fragments(int fd, int nfrags, int frag_size) {
 243     int arg;
 244     arg = ((int) nfrags << 16) | simple_log2(frag_size);
 245
 246     if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &arg) < 0) {
 247         pa_log("SNDCTL_DSP_SETFRAGMENT: %s", pa_cstrerror(errno));
 248         return -1;
 249     }
 250
 251     return 0;
 252 }
 253
 254 int pa_oss_get_volume(int fd, unsigned long mixer, const pa_sample_spec *ss, pa_cvolume *volume) {
 255     char cv[PA_CVOLUME_SNPRINT_MAX];
 256     unsigned vol;
 257
 258     pa_assert(fd >= 0);
 259     pa_assert(ss);
 260     pa_assert(volume);
 261
 262     if (ioctl(fd, mixer, &vol) < 0)
 263         return -1;
 264
 265     pa_cvolume_reset(volume, ss->channels);
 266
 267     volume->values[0] = ((vol & 0xFF) * PA_VOLUME_NORM) / 100;
 268
 269     if (volume->channels >= 2)
 270         volume->values[1] = (((vol >> 8) & 0xFF) * PA_VOLUME_NORM) / 100;
 271
 272     pa_log_debug("Read mixer settings: %s", pa_cvolume_snprint(cv, sizeof(cv), volume));
 273     return 0;
 274 }
 275
 276 int pa_oss_set_volume(int fd, unsigned long mixer, const pa_sample_spec *ss, const pa_cvolume *volume) {
 277     char cv[PA_CVOLUME_SNPRINT_MAX];
 278     unsigned vol;
 279     pa_volume_t l, r;
 280
 281     l = volume->values[0] > PA_VOLUME_NORM ? PA_VOLUME_NORM : volume->values[0];
 282
 283     vol = (l*100)/PA_VOLUME_NORM;
 284
 285     if (ss->channels >= 2) {
 286         r = volume->values[1] > PA_VOLUME_NORM ? PA_VOLUME_NORM : volume->values[1];
 287         vol |= ((r*100)/PA_VOLUME_NORM) << 8;
 288     }
 289
 290     if (ioctl(fd, mixer, &vol) < 0)
 291         return -1;
 292
 293     pa_log_debug("Wrote mixer settings: %s", pa_cvolume_snprint(cv, sizeof(cv), volume));
 294     return 0;
 295 }
 296
 297 static int get_device_number(const char *dev) {
 298     const char *p, *e;
 299     char *rp = NULL;
 300     int r;
 301
 302     if (!(p = rp = pa_readlink(dev))) {
 303         if (errno != EINVAL && errno != ENOLINK) {
 304             r = -1;
 305             goto finish;
 306         }
 307
 308         p = dev;
 309     }
 310
 311     if ((e = strrchr(p, '/')))
 312         p = e+1;
 313
 314     if (p == 0) {
 315         r = 0;
 316         goto finish;
 317     }
 318
 319     p = strchr(p, 0) -1;
 320
 321     if (*p >= '0' && *p <= '9') {
 322         r = *p - '0';
 323         goto finish;
 324     }
 325
 326     r = -1;
 327
 328 finish:
 329     pa_xfree(rp);
 330     return r;
 331 }
 332
 333 int pa_oss_get_hw_description(const char *dev, char *name, size_t l) {
 334     FILE *f;
 335     int n, r = -1;
 336     int b = 0;
 337
 338     if ((n = get_device_number(dev)) < 0)
 339         return -1;
 340
 341     if (!(f = fopen("/dev/sndstat", "r")) &&
 342         !(f = fopen("/proc/sndstat", "r")) &&
 343         !(f = fopen("/proc/asound/oss/sndstat", "r"))) {
 344
 345         if (errno != ENOENT)
 346             pa_log_warn("failed to open OSS sndstat device: %s", pa_cstrerror(errno));
 347
 348         return -1;
 349     }
 350
 351     while (!feof(f)) {
 352         char line[64];
 353         int device;
 354
 355         if (!fgets(line, sizeof(line), f))
 356             break;
 357
 358         line[strcspn(line, "\r\n")] = 0;
 359
 360         if (!b) {
 361             b = strcmp(line, "Audio devices:") == 0;
 362             continue;
 363         }
 364
 365         if (line[0] == 0)
 366             break;
 367
 368         if (sscanf(line, "%i: ", &device) != 1)
 369             continue;
 370
 371         if (device == n) {
 372             char *k = strchr(line, ':');
 373             pa_assert(k);
 374             k++;
 375             k += strspn(k, " ");
 376
 377             if (pa_endswith(k, " (DUPLEX)"))
 378                 k[strlen(k)-9] = 0;
 379
 380             pa_strlcpy(name, k, l);
 381             r = 0;
 382             break;
 383         }
 384     }
 385
 386     fclose(f);
 387     return r;
 388 }
 389
 390 static int open_mixer(const char *mixer) {
 391     int fd;
 392
 393     if ((fd = open(mixer, O_RDWR|O_NDELAY|O_NOCTTY)) >= 0)
 394         return fd;
 395
 396     return -1;
 397 }
 398
 399 int pa_oss_open_mixer_for_device(const char *device) {
 400     int n;
 401     char *fn;
 402     int fd;
 403
 404     if ((n = get_device_number(device)) < 0)
 405         return -1;
 406
 407     if (n == 0)
 408         if ((fd = open_mixer("/dev/mixer")) >= 0)
 409             return fd;
 410
 411     fn = pa_sprintf_malloc("/dev/mixer%i", n);
 412     fd = open_mixer(fn);
 413     pa_xfree(fn);
 414
 415     if (fd < 0)
 416         pa_log_warn("Failed to open mixer '%s': %s", device, pa_cstrerror(errno));
 417
 418     return fd;
 419 }