code.delx.au - pulseaudio/blob - src/modules/alsa-util.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 <sys/types.h>
  27 #include <asoundlib.h>
  28
  29 #include <polyp/sample.h>
  30 #include <polyp/xmalloc.h>
  31
  32 #include <polypcore/log.h>
  33
  34 #include "alsa-util.h"
  35
  36 struct pa_alsa_fdlist {
  37     int num_fds;
  38     struct pollfd *fds;
  39     /* This is a temporary buffer used to avoid lots of mallocs */
  40     struct pollfd *work_fds;
  41
  42     snd_pcm_t *pcm;
  43     snd_mixer_t *mixer;
  44
  45     pa_mainloop_api *m;
  46     pa_defer_event *defer;
  47     pa_io_event **ios;
  48
  49     int polled;
  50
  51     void (*cb)(void *userdata);
  52     void *userdata;
  53 };
  54
  55 static void io_cb(pa_mainloop_api*a, pa_io_event* e, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void *userdata) {
  56     struct pa_alsa_fdlist *fdl = (struct pa_alsa_fdlist*)userdata;
  57     int err, i;
  58     unsigned short revents;
  59
  60     assert(a && fdl && (fdl->pcm || fdl->mixer) && fdl->fds && fdl->work_fds);
  61
  62     if (fdl->polled)
  63         return;
  64
  65     fdl->polled = 1;
  66
  67     memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
  68
  69     for (i = 0;i < fdl->num_fds;i++) {
  70         if (e == fdl->ios[i]) {
  71             if (events & PA_IO_EVENT_INPUT)
  72                 fdl->work_fds[i].revents |= POLLIN;
  73             if (events & PA_IO_EVENT_OUTPUT)
  74                 fdl->work_fds[i].revents |= POLLOUT;
  75             if (events & PA_IO_EVENT_ERROR)
  76                 fdl->work_fds[i].revents |= POLLERR;
  77             if (events & PA_IO_EVENT_HANGUP)
  78                 fdl->work_fds[i].revents |= POLLHUP;
  79             break;
  80         }
  81     }
  82
  83     assert(i != fdl->num_fds);
  84
  85     if (fdl->pcm)
  86         err = snd_pcm_poll_descriptors_revents(fdl->pcm, fdl->work_fds, fdl->num_fds, &revents);
  87     else
  88         err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents);
  89
  90     if (err < 0) {
  91         pa_log_error(__FILE__": Unable to get poll revent: %s",
  92             snd_strerror(err));
  93         return;
  94     }
  95
  96     if (revents) {
  97         if (fdl->pcm)
  98             fdl->cb(fdl->userdata);
  99         else
 100             snd_mixer_handle_events(fdl->mixer);
 101     }
 102
 103     a->defer_enable(fdl->defer, 1);
 104 }
 105
 106 static void defer_cb(pa_mainloop_api*a, PA_GCC_UNUSED pa_defer_event* e, void *userdata) {
 107     struct pa_alsa_fdlist *fdl = (struct pa_alsa_fdlist*)userdata;
 108     int num_fds, i, err;
 109     struct pollfd *temp;
 110
 111     assert(a && fdl && (fdl->pcm || fdl->mixer));
 112
 113     a->defer_enable(fdl->defer, 0);
 114
 115     if (fdl->pcm)
 116         num_fds = snd_pcm_poll_descriptors_count(fdl->pcm);
 117     else
 118         num_fds = snd_mixer_poll_descriptors_count(fdl->mixer);
 119     assert(num_fds > 0);
 120
 121     if (num_fds != fdl->num_fds) {
 122         if (fdl->fds)
 123             pa_xfree(fdl->fds);
 124         if (fdl->work_fds)
 125             pa_xfree(fdl->work_fds);
 126         fdl->fds = pa_xmalloc0(sizeof(struct pollfd) * num_fds);
 127         fdl->work_fds = pa_xmalloc(sizeof(struct pollfd) * num_fds);
 128     }
 129
 130     memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
 131
 132     if (fdl->pcm)
 133         err = snd_pcm_poll_descriptors(fdl->pcm, fdl->work_fds, num_fds);
 134     else
 135         err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds);
 136
 137     if (err < 0) {
 138         pa_log_error(__FILE__": Unable to get poll descriptors: %s",
 139             snd_strerror(err));
 140         return;
 141     }
 142
 143     fdl->polled = 0;
 144
 145     if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
 146         return;
 147
 148     if (fdl->ios) {
 149         for (i = 0;i < fdl->num_fds;i++)
 150             a->io_free(fdl->ios[i]);
 151         if (num_fds != fdl->num_fds) {
 152             pa_xfree(fdl->ios);
 153             fdl->ios = pa_xmalloc(sizeof(pa_io_event*) * num_fds);
 154             assert(fdl->ios);
 155         }
 156     } else {
 157         fdl->ios = pa_xmalloc(sizeof(pa_io_event*) * num_fds);
 158         assert(fdl->ios);
 159     }
 160
 161     /* Swap pointers */
 162     temp = fdl->work_fds;
 163     fdl->work_fds = fdl->fds;
 164     fdl->fds = temp;
 165
 166     fdl->num_fds = num_fds;
 167
 168     for (i = 0;i < num_fds;i++) {
 169         fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
 170             ((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
 171             ((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
 172             io_cb, fdl);
 173         assert(fdl->ios[i]);
 174     }
 175 }
 176
 177 struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
 178     struct pa_alsa_fdlist *fdl;
 179
 180     fdl = pa_xmalloc(sizeof(struct pa_alsa_fdlist));
 181     assert(fdl);
 182
 183     fdl->num_fds = 0;
 184     fdl->fds = NULL;
 185     fdl->work_fds = NULL;
 186
 187     fdl->pcm = NULL;
 188     fdl->mixer = NULL;
 189
 190     fdl->m = NULL;
 191     fdl->defer = NULL;
 192     fdl->ios = NULL;
 193
 194     fdl->polled = 0;
 195
 196     return fdl;
 197 }
 198
 199 void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
 200     assert(fdl);
 201
 202     if (fdl->defer) {
 203         assert(fdl->m);
 204         fdl->m->defer_free(fdl->defer);
 205     }
 206
 207     if (fdl->ios) {
 208         int i;
 209         assert(fdl->m);
 210         for (i = 0;i < fdl->num_fds;i++)
 211             fdl->m->io_free(fdl->ios[0]);
 212         pa_xfree(fdl->ios);
 213     }
 214
 215     if (fdl->fds)
 216         pa_xfree(fdl->fds);
 217     if (fdl->work_fds)
 218         pa_xfree(fdl->work_fds);
 219
 220     pa_xfree(fdl);
 221 }
 222
 223 int pa_alsa_fdlist_init_pcm(struct pa_alsa_fdlist *fdl, snd_pcm_t *pcm_handle, pa_mainloop_api* m, void (*cb)(void *userdata), void *userdata) {
 224     assert(fdl && pcm_handle && m && !fdl->m && cb);
 225
 226     fdl->pcm = pcm_handle;
 227     fdl->m = m;
 228
 229     fdl->defer = m->defer_new(m, defer_cb, fdl);
 230     assert(fdl->defer);
 231
 232     fdl->cb = cb;
 233     fdl->userdata = userdata;
 234
 235     return 0;
 236 }
 237
 238 int pa_alsa_fdlist_init_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
 239     assert(fdl && mixer_handle && m && !fdl->m);
 240
 241     fdl->mixer = mixer_handle;
 242     fdl->m = m;
 243
 244     fdl->defer = m->defer_new(m, defer_cb, fdl);
 245     assert(fdl->defer);
 246
 247     return 0;
 248 }
 249
 250 static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
 251
 252     static const snd_pcm_format_t format_trans[] = {
 253         [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
 254         [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
 255         [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
 256         [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
 257         [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
 258         [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
 259         [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
 260     };
 261
 262     static const pa_sample_format_t try_order[] = {
 263         PA_SAMPLE_S16NE,
 264         PA_SAMPLE_S16RE,
 265         PA_SAMPLE_FLOAT32NE,
 266         PA_SAMPLE_FLOAT32RE,
 267         PA_SAMPLE_ULAW,
 268         PA_SAMPLE_ALAW,
 269         PA_SAMPLE_U8,
 270         PA_SAMPLE_INVALID
 271     };
 272
 273     int i, ret;
 274
 275     assert(pcm_handle);
 276     assert(f);
 277
 278     if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
 279         return ret;
 280
 281     if (*f == PA_SAMPLE_FLOAT32BE)
 282         *f = PA_SAMPLE_FLOAT32LE;
 283     else if (*f == PA_SAMPLE_FLOAT32LE)
 284         *f = PA_SAMPLE_FLOAT32BE;
 285     else if (*f == PA_SAMPLE_S16BE)
 286         *f = PA_SAMPLE_S16LE;
 287     else if (*f == PA_SAMPLE_S16LE)
 288         *f = PA_SAMPLE_S16BE;
 289     else
 290         goto try_auto;
 291
 292     if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
 293         return ret;
 294
 295 try_auto:
 296
 297     for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
 298         *f = try_order[i];
 299
 300         if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
 301             return ret;
 302     }
 303
 304     return -1;
 305 }
 306
 307 /* Set the hardware parameters of the given ALSA device. Returns the
 308  * selected fragment settings in *period and *period_size */
 309 int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
 310     int ret = -1;
 311     snd_pcm_uframes_t buffer_size;
 312     unsigned int r = ss->rate;
 313     unsigned int c = ss->channels;
 314     pa_sample_format_t f = ss->format;
 315     snd_pcm_hw_params_t *hwparams;
 316
 317     assert(pcm_handle);
 318     assert(ss);
 319     assert(periods);
 320     assert(period_size);
 321
 322     buffer_size = *periods * *period_size;
 323
 324     if ((ret = snd_pcm_hw_params_malloc(&hwparams)) < 0 ||
 325         (ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0 ||
 326         (ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0 ||
 327         (ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
 328         goto finish;
 329
 330     if ((ret = set_format(pcm_handle, hwparams, &f)) < 0)
 331         goto finish;
 332
 333     if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0)
 334         goto finish;
 335
 336     if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
 337         goto finish;
 338
 339     if ((*period_size > 0 && (ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL)) < 0) ||
 340         (*periods > 0 && (ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0))
 341         goto finish;
 342
 343     if  ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
 344         goto finish;
 345
 346     if (ss->rate != r) {
 347         pa_log_warn(__FILE__": device doesn't support %u Hz, changed to %u Hz.", ss->rate, r);
 348
 349         /* If the sample rate deviates too much, we need to resample */
 350         if (r < ss->rate*.95 || r > ss->rate*1.05)
 351             ss->rate = r;
 352     }
 353
 354     if (ss->channels != c) {
 355         pa_log_warn(__FILE__": device doesn't support %u channels, changed to %u.", ss->channels, c);
 356         ss->channels = c;
 357     }
 358
 359     if (ss->format != f) {
 360         pa_log_warn(__FILE__": device doesn't support sample format %s, changed to %s.", pa_sample_format_to_string(ss->format), pa_sample_format_to_string(f));
 361         ss->format = f;
 362     }
 363
 364     if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
 365         goto finish;
 366
 367     if ((ret = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size)) < 0 ||
 368         (ret = snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL)) < 0)
 369         goto finish;
 370
 371     assert(buffer_size > 0);
 372     assert(*period_size > 0);
 373     *periods = buffer_size / *period_size;
 374     assert(*periods > 0);
 375
 376     ret = 0;
 377
 378 finish:
 379     if (hwparams)
 380         snd_pcm_hw_params_free(hwparams);
 381
 382     return ret;
 383 }
 384
 385 int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
 386     int err;
 387
 388     assert(mixer && dev);
 389
 390     if ((err = snd_mixer_attach(mixer, dev)) < 0) {
 391         pa_log_warn(__FILE__": Unable to attach to mixer %s: %s", dev, snd_strerror(err));
 392         return -1;
 393     }
 394
 395     if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
 396         pa_log_warn(__FILE__": Unable to register mixer: %s", snd_strerror(err));
 397         return -1;
 398     }
 399
 400     if ((err = snd_mixer_load(mixer)) < 0) {
 401         pa_log_warn(__FILE__": Unable to load mixer: %s", snd_strerror(err));
 402         return -1;
 403     }
 404
 405     return 0;
 406 }
 407
 408 snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) {
 409     snd_mixer_elem_t *elem;
 410     snd_mixer_selem_id_t *sid = NULL;
 411     snd_mixer_selem_id_alloca(&sid);
 412
 413     assert(mixer);
 414     assert(name);
 415
 416     snd_mixer_selem_id_set_name(sid, name);
 417
 418     if (!(elem = snd_mixer_find_selem(mixer, sid))) {
 419         pa_log_warn(__FILE__": Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
 420
 421         if (fallback) {
 422             snd_mixer_selem_id_set_name(sid, fallback);
 423
 424             if (!(elem = snd_mixer_find_selem(mixer, sid)))
 425                 pa_log_warn(__FILE__": Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
 426         }
 427     }
 428
 429     if (elem)
 430         pa_log_info(__FILE__": Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
 431
 432     return elem;
 433 }