code.delx.au - pulseaudio/blob - src/modules/module-alsa-source.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 <assert.h>
  30 #include <stdio.h>
  31
  32 #ifdef HAVE_SYS_POLL_H
  33 #include <sys/poll.h>
  34 #else
  35 #include "poll.h"
  36 #endif
  37
  38 #include <asoundlib.h>
  39
  40 #include <pulse/xmalloc.h>
  41
  42 #include <pulsecore/core-error.h>
  43 #include <pulsecore/core.h>
  44 #include <pulsecore/module.h>
  45 #include <pulsecore/memchunk.h>
  46 #include <pulsecore/sink.h>
  47 #include <pulsecore/modargs.h>
  48 #include <pulsecore/core-util.h>
  49 #include <pulsecore/sample-util.h>
  50 #include <pulsecore/log.h>
  51 #include <pulsecore/macro.h>
  52 #include <pulsecore/thread.h>
  53 #include <pulsecore/core-error.h>
  54
  55 #include "alsa-util.h"
  56 #include "module-alsa-source-symdef.h"
  57
  58 PA_MODULE_AUTHOR("Lennart Poettering")
  59 PA_MODULE_DESCRIPTION("ALSA Source")
  60 PA_MODULE_VERSION(PACKAGE_VERSION)
  61 PA_MODULE_USAGE(
  62         "source_name=<name for the source> "
  63         "device=<ALSA device> "
  64         "format=<sample format> "
  65         "channels=<number of channels> "
  66         "rate=<sample rate> "
  67         "fragments=<number of fragments> "
  68         "fragment_size=<fragment size> "
  69         "channel_map=<channel map> "
  70         "mmap=<enable memory mapping?>")
  71
  72 #define DEFAULT_DEVICE "default"
  73 #define DEFAULT_NFRAGS 4
  74 #define DEFAULT_FRAGSIZE_MSEC 25
  75
  76 struct userdata {
  77     pa_core *core;
  78     pa_module *module;
  79     pa_source *source;
  80     pa_thread *thread;
  81     pa_asyncmsgq *asyncmsgq;
  82
  83     snd_pcm_t *pcm_handle;
  84
  85     pa_alsa_fdlist *mixer_fdl;
  86     snd_mixer_t *mixer_handle;
  87     snd_mixer_elem_t *mixer_elem;
  88     long hw_volume_max, hw_volume_min;
  89
  90     size_t frame_size, fragment_size, hwbuf_size;
  91     unsigned nfragments;
  92
  93     char *device_name;
  94
  95     int use_mmap;
  96 };
  97
  98 static const char* const valid_modargs[] = {
  99     "device",
 100     "source_name",
 101     "channels",
 102     "rate",
 103     "format",
 104     "fragments",
 105     "fragment_size",
 106     "channel_map",
 107     "mmap",
 108     NULL
 109 };
 110
 111 static int mmap_read(struct userdata *u) {
 112     snd_pcm_sframes_t n;
 113     int err;
 114     const snd_pcm_channel_area_t *areas;
 115     snd_pcm_uframes_t offset, frames;
 116     int work_done = 0;
 117
 118     pa_assert(u);
 119     pa_assert(u->source);
 120
 121     for (;;) {
 122         pa_memchunk chunk;
 123         void *p;
 124
 125         if ((n = snd_pcm_avail_update(u->pcm_handle)) < 0) {
 126
 127             if (n == -EPIPE)
 128                 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
 129
 130             if ((err = snd_pcm_recover(u->pcm_handle, n, 1)) == 0)
 131                 continue;
 132
 133             if (err == -EAGAIN)
 134                 return work_done;
 135
 136             pa_log("snd_pcm_avail_update: %s", snd_strerror(n));
 137             return -1;
 138         }
 139
 140 /*         pa_log("Got request for %i samples", (int) n); */
 141
 142         if (n <= 0)
 143             return work_done;
 144
 145         frames = n;
 146
 147         if ((err = snd_pcm_mmap_begin(u->pcm_handle, &areas, &offset, &frames)) < 0) {
 148
 149             if (err == -EPIPE)
 150                 pa_log_debug("snd_pcm_mmap_begin: Buffer underrun!");
 151
 152             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
 153                 continue;
 154
 155             if (err == -EAGAIN)
 156                 return work_done;
 157
 158             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 159             return -1;
 160         }
 161
 162         /* Check these are multiples of 8 bit */
 163         pa_assert((areas[0].first & 7) == 0);
 164         pa_assert((areas[0].step & 7)== 0);
 165
 166         /* We assume a single interleaved memory buffer */
 167         pa_assert((areas[0].first >> 3) == 0);
 168         pa_assert((areas[0].step >> 3) == u->frame_size);
 169
 170         p = (uint8_t*) areas[0].addr + (offset * u->frame_size);
 171
 172         chunk.memblock = pa_memblock_new_fixed(u->core->mempool, p, frames * u->frame_size, 1);
 173         chunk.length = pa_memblock_get_length(chunk.memblock);
 174         chunk.index = 0;
 175
 176         pa_source_post(u->source, &chunk);
 177
 178         /* FIXME: Maybe we can do something to keep this memory block
 179          * a little bit longer around? */
 180         pa_memblock_unref_fixed(chunk.memblock);
 181
 182         if ((err = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0) {
 183
 184             if (err == -EPIPE)
 185                 pa_log_debug("snd_pcm_mmap_commit: Buffer underrun!");
 186
 187             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
 188                 continue;
 189
 190             if (err == -EAGAIN)
 191                 return work_done;
 192
 193             pa_log("Failed to write data to DSP: %s", snd_strerror(err));
 194             return -1;
 195         }
 196
 197         work_done = 1;
 198
 199 /*         pa_log("wrote %i samples", (int) frames); */
 200     }
 201 }
 202
 203 static pa_usec_t source_get_latency(struct userdata *u) {
 204     pa_usec_t r = 0;
 205     snd_pcm_sframes_t frames = 0;
 206     int err;
 207
 208     pa_assert(u);
 209
 210     snd_pcm_avail_update(u->pcm_handle);
 211
 212     if ((err = snd_pcm_delay(u->pcm_handle, &frames)) < 0) {
 213         pa_log("Failed to get delay: %s", snd_strerror(err));
 214         return 0;
 215     }
 216
 217     if (frames > 0)
 218         r = pa_bytes_to_usec(frames * u->frame_size, &u->source->sample_spec);
 219
 220     return r;
 221 }
 222
 223 static int suspend(struct userdata *u) {
 224     pa_assert(u);
 225     pa_assert(u->pcm_handle);
 226
 227     /* Let's suspend */
 228     snd_pcm_close(u->pcm_handle);
 229     u->pcm_handle = NULL;
 230
 231     pa_log_debug("Device suspended...");
 232
 233     return 0;
 234 }
 235
 236 static int unsuspend(struct userdata *u) {
 237     pa_sample_spec ss;
 238     int err, b;
 239     unsigned nfrags;
 240     snd_pcm_uframes_t period_size;
 241
 242     pa_assert(u);
 243     pa_assert(!u->pcm_handle);
 244
 245     pa_log_debug("Trying resume...");
 246
 247     snd_config_update_free_global();
 248     if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
 249         pa_log("Error opening PCM device %s: %s", u->device_name, snd_strerror(err));
 250         goto fail;
 251     }
 252
 253     ss = u->source->sample_spec;
 254     nfrags = u->nfragments;
 255     period_size = u->fragment_size / u->frame_size;
 256     b = u->use_mmap;
 257
 258     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
 259         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 260         goto fail;
 261     }
 262
 263     if (b != u->use_mmap) {
 264         pa_log_warn("Resume failed, couldn't get original access mode.");
 265         goto fail;
 266     }
 267
 268     if (!pa_sample_spec_equal(&ss, &u->source->sample_spec)) {
 269         pa_log_warn("Resume failed, couldn't restore original sample settings.");
 270         goto fail;
 271     }
 272
 273     if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
 274         pa_log_warn("Resume failed, couldn't restore original fragment settings.");
 275         goto fail;
 276     }
 277
 278     snd_pcm_start(u->pcm_handle);
 279
 280     /* FIXME: We need to reload the volume somehow */
 281
 282     pa_log_debug("Resumed successfully...");
 283
 284     return 0;
 285
 286 fail:
 287     snd_pcm_close(u->pcm_handle);
 288     u->pcm_handle = NULL;
 289
 290     return -1;
 291 }
 292
 293 static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 294     struct userdata *u = PA_SOURCE(o)->userdata;
 295
 296     switch (code) {
 297
 298         case PA_SOURCE_MESSAGE_GET_LATENCY: {
 299             pa_usec_t r = 0;
 300
 301             if (u->pcm_handle)
 302                 r = source_get_latency(u);
 303
 304             *((pa_usec_t*) data) = r;
 305
 306             break;
 307         }
 308
 309         case PA_SOURCE_MESSAGE_SET_STATE:
 310
 311             switch ((pa_source_state_t) PA_PTR_TO_UINT(data)) {
 312
 313                 case PA_SOURCE_SUSPENDED:
 314                     pa_assert(PA_SOURCE_OPENED(u->source->thread_info.state));
 315
 316                     if (suspend(u) < 0)
 317                         return -1;
 318
 319                     break;
 320
 321                 case PA_SOURCE_IDLE:
 322                 case PA_SOURCE_RUNNING:
 323
 324                     if (u->source->thread_info.state == PA_SOURCE_SUSPENDED) {
 325                         if (unsuspend(u) < 0)
 326                             return -1;
 327                     }
 328
 329                     break;
 330
 331                 case PA_SOURCE_DISCONNECTED:
 332                     ;
 333             }
 334
 335             break;
 336     }
 337
 338     return pa_source_process_msg(o, code, data, offset, chunk);
 339 }
 340
 341 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
 342     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 343
 344     pa_assert(u);
 345     pa_assert(u->mixer_handle);
 346
 347     if (mask == SND_CTL_EVENT_MASK_REMOVE)
 348         return 0;
 349
 350     if (mask & SND_CTL_EVENT_MASK_VALUE) {
 351         pa_source_get_volume(u->source);
 352         pa_source_get_mute(u->source);
 353     }
 354
 355     return 0;
 356 }
 357
 358 static int source_get_volume_cb(pa_source *s) {
 359     struct userdata *u = s->userdata;
 360     int err;
 361     int i;
 362
 363     pa_assert(u);
 364     pa_assert(u->mixer_elem);
 365
 366     for (i = 0; i < s->sample_spec.channels; i++) {
 367         long set_vol, vol;
 368
 369         pa_assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 370
 371         if ((err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol)) < 0)
 372             goto fail;
 373
 374         set_vol = (long) roundf(((float) s->volume.values[i] * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 375
 376         /* Try to avoid superfluous volume changes */
 377         if (set_vol != vol)
 378             s->volume.values[i] = (pa_volume_t) roundf(((float) (vol - u->hw_volume_min) * PA_VOLUME_NORM) / (u->hw_volume_max - u->hw_volume_min));
 379     }
 380
 381     return 0;
 382
 383 fail:
 384     pa_log_error("Unable to read volume: %s", snd_strerror(err));
 385
 386     s->get_volume = NULL;
 387     s->set_volume = NULL;
 388     return -1;
 389 }
 390
 391 static int source_set_volume_cb(pa_source *s) {
 392     struct userdata *u = s->userdata;
 393     int err;
 394     int i;
 395
 396     pa_assert(u);
 397     pa_assert(u->mixer_elem);
 398
 399     for (i = 0; i < s->sample_spec.channels; i++) {
 400         long alsa_vol;
 401         pa_volume_t vol;
 402
 403         pa_assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
 404
 405         vol = s->volume.values[i];
 406
 407         if (vol > PA_VOLUME_NORM)
 408             vol = PA_VOLUME_NORM;
 409
 410         alsa_vol = (long) roundf(((float) vol * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
 411
 412         if ((err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, alsa_vol)) < 0)
 413             goto fail;
 414     }
 415
 416     return 0;
 417
 418 fail:
 419     pa_log_error("Unable to set volume: %s", snd_strerror(err));
 420
 421     s->get_volume = NULL;
 422     s->set_volume = NULL;
 423     return -1;
 424 }
 425
 426 static int source_get_mute_cb(pa_source *s) {
 427     struct userdata *u = s->userdata;
 428     int err, sw;
 429
 430     pa_assert(u);
 431     pa_assert(u->mixer_elem);
 432
 433     if ((err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw)) < 0) {
 434         pa_log_error("Unable to get switch: %s", snd_strerror(err));
 435
 436         s->get_mute = NULL;
 437         s->set_mute = NULL;
 438         return -1;
 439     }
 440
 441     s->muted = !sw;
 442
 443     return 0;
 444 }
 445
 446 static int source_set_mute_cb(pa_source *s) {
 447     struct userdata *u = s->userdata;
 448     int err;
 449
 450     pa_assert(u);
 451     pa_assert(u->mixer_elem);
 452
 453     if ((err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->muted)) < 0) {
 454         pa_log_error("Unable to set switch: %s", snd_strerror(err));
 455
 456         s->get_mute = NULL;
 457         s->set_mute = NULL;
 458         return -1;
 459     }
 460
 461     return 0;
 462 }
 463
 464 static void thread_func(void *userdata) {
 465     enum {
 466         POLLFD_ASYNCQ,
 467         POLLFD_ALSA_BASE
 468     };
 469
 470     struct userdata *u = userdata;
 471     struct pollfd *pollfd = NULL;
 472     int n_alsa_fds, err;
 473     unsigned short revents = 0;
 474     snd_pcm_status_t *status;
 475
 476     pa_assert(u);
 477     snd_pcm_status_alloca(&status);
 478
 479     pa_log_debug("Thread starting up");
 480
 481     if ((n_alsa_fds = snd_pcm_poll_descriptors_count(u->pcm_handle)) < 0) {
 482         pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n_alsa_fds));
 483         goto fail;
 484     }
 485
 486     pollfd = pa_xnew0(struct pollfd, POLLFD_ALSA_BASE + n_alsa_fds);
 487
 488     pollfd[POLLFD_ASYNCQ].fd = pa_asyncmsgq_get_fd(u->asyncmsgq);
 489     pollfd[POLLFD_ASYNCQ].events = POLLIN;
 490
 491     if ((err = snd_pcm_poll_descriptors(u->pcm_handle, pollfd+POLLFD_ALSA_BASE, n_alsa_fds)) < 0) {
 492         pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
 493         goto fail;
 494     }
 495
 496     for (;;) {
 497         pa_msgobject *object;
 498         int code;
 499         void *data;
 500         int r;
 501         int64_t offset;
 502         pa_memchunk chunk;
 503
 504 /*         pa_log("loop");     */
 505
 506         /* Check whether there is a message for us to process */
 507         if (pa_asyncmsgq_get(u->asyncmsgq, &object, &code, &data, &offset, &chunk, 0) == 0) {
 508             int ret;
 509
 510 /*             pa_log("processing msg"); */
 511
 512             if (!object && code == PA_MESSAGE_SHUTDOWN) {
 513                 pa_asyncmsgq_done(u->asyncmsgq, 0);
 514                 goto finish;
 515             }
 516
 517             ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
 518             pa_asyncmsgq_done(u->asyncmsgq, ret);
 519             continue;
 520         }
 521
 522 /*         pa_log("loop2"); */
 523
 524         /* Render some data and write it to the dsp */
 525
 526         if (PA_SOURCE_OPENED(u->source->thread_info.state) && (revents & POLLIN)) {
 527             int work_done = 0;
 528             pa_assert(u->pcm_handle);
 529
 530             if (u->use_mmap) {
 531
 532                 if ((work_done = mmap_read(u)) < 0)
 533                     goto fail;
 534
 535             } else {
 536
 537                 for (;;) {
 538                     void *p;
 539                     snd_pcm_sframes_t t;
 540                     ssize_t l;
 541
 542                     if ((err = snd_pcm_status(u->pcm_handle, status)) < 0) {
 543                         pa_log("Failed to query DSP status data: %s", snd_strerror(t));
 544                         goto fail;
 545                     }
 546
 547                     if (snd_pcm_status_get_avail_max(status)*u->frame_size >= u->hwbuf_size)
 548                         pa_log_debug("Buffer overrun!");
 549
 550                     l = snd_pcm_status_get_avail(status) * u->frame_size;
 551
 552                     if (l <= 0)
 553                         break;
 554
 555                     chunk.memblock = pa_memblock_new(u->core->mempool, l);
 556
 557                     p = pa_memblock_acquire(chunk.memblock);
 558                     t = snd_pcm_readi(u->pcm_handle, (uint8_t*) p, l / u->frame_size);
 559                     pa_memblock_release(chunk.memblock);
 560
 561 /*                     pa_log("wrote %i bytes of %u (%u)", t*u->frame_size, u->memchunk.length, l);   */
 562
 563                     pa_assert(t != 0);
 564
 565                     if (t < 0) {
 566                         pa_memblock_unref(chunk.memblock);
 567
 568                         pa_assert(t != -EPIPE);
 569
 570                         if ((t = snd_pcm_recover(u->pcm_handle, t, 1)) == 0)
 571                             continue;
 572
 573                         if (t == -EAGAIN) {
 574                             pa_log_debug("EAGAIN");
 575                             break;
 576                         } else {
 577                             pa_log("Failed to read data from DSP: %s", snd_strerror(t));
 578                             goto fail;
 579                         }
 580
 581                     }
 582
 583                     chunk.index = 0;
 584                     chunk.length = t * u->frame_size;
 585
 586                     pa_source_post(u->source, &chunk);
 587                     pa_memblock_unref(chunk.memblock);
 588
 589                     work_done = 1;
 590
 591                     if (t * u->frame_size >= (unsigned) l)
 592                         break;
 593                 }
 594             }
 595
 596             revents &= ~POLLIN;
 597
 598             if (work_done)
 599                 continue;
 600         }
 601
 602         /* Hmm, nothing to do. Let's sleep */
 603         if (pa_asyncmsgq_before_poll(u->asyncmsgq) < 0)
 604             continue;
 605
 606 /*         pa_log("polling for %i", POLLFD_ALSA_BASE + (PA_SOURCE_OPENED(u->source->thread_info.state) ? n_alsa_fds : 0));   */
 607         r = poll(pollfd, POLLFD_ALSA_BASE + (PA_SOURCE_OPENED(u->source->thread_info.state) ? n_alsa_fds : 0), -1);
 608         /*pa_log("polling got dsp=%i amq=%i (%i)", r > 0 ? pollfd[POLLFD_DSP].revents : 0, r > 0 ? pollfd[POLLFD_ASYNCQ].revents : 0, r); */
 609 /*         pa_log("poll end"); */
 610
 611         pa_asyncmsgq_after_poll(u->asyncmsgq);
 612
 613         if (r < 0) {
 614             if (errno == EINTR) {
 615                 pollfd[POLLFD_ASYNCQ].revents = 0;
 616                 revents = 0;
 617                 continue;
 618             }
 619
 620             pa_log("poll() failed: %s", pa_cstrerror(errno));
 621             goto fail;
 622         }
 623
 624         pa_assert(r > 0);
 625
 626         if (PA_SOURCE_OPENED(u->source->thread_info.state)) {
 627             if ((err = snd_pcm_poll_descriptors_revents(u->pcm_handle, pollfd + POLLFD_ALSA_BASE, n_alsa_fds, &revents)) < 0) {
 628                 pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err));
 629                 goto fail;
 630             }
 631
 632 /*             pa_log("got alsa event"); */
 633         } else
 634             revents = 0;
 635
 636         pa_assert((pollfd[POLLFD_ASYNCQ].revents & ~POLLIN) == 0);
 637     }
 638
 639 fail:
 640     /* We have to continue processing messages until we receive the
 641      * SHUTDOWN message */
 642     pa_asyncmsgq_post(u->core->asyncmsgq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 643     pa_asyncmsgq_wait_for(u->asyncmsgq, PA_MESSAGE_SHUTDOWN);
 644
 645 finish:
 646     pa_log_debug("Thread shutting down");
 647
 648     pa_xfree(pollfd);
 649 }
 650
 651
 652 int pa__init(pa_core *c, pa_module*m) {
 653
 654     pa_modargs *ma = NULL;
 655     int ret = -1;
 656     struct userdata *u = NULL;
 657     const char *dev;
 658     pa_sample_spec ss;
 659     pa_channel_map map;
 660     unsigned nfrags, frag_size;
 661     snd_pcm_uframes_t period_size;
 662     size_t frame_size;
 663     snd_pcm_info_t *pcm_info = NULL;
 664     int err;
 665     char *t;
 666     const char *name;
 667     char *name_buf = NULL;
 668     int namereg_fail;
 669     int use_mmap = 1, b;
 670
 671     pa_assert(c);
 672     pa_assert(m);
 673
 674     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 675         pa_log("Failed to parse module arguments");
 676         goto fail;
 677     }
 678
 679     ss = c->default_sample_spec;
 680     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
 681         pa_log("Failed to parse sample specification");
 682         goto fail;
 683     }
 684
 685     frame_size = pa_frame_size(&ss);
 686
 687     /* Fix latency to 100ms */
 688     nfrags = DEFAULT_NFRAGS;
 689     frag_size = pa_usec_to_bytes(DEFAULT_FRAGSIZE_MSEC*1000, &ss);
 690     if (frag_size <= 0)
 691         frag_size = frame_size;
 692
 693     if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0) {
 694         pa_log("Failed to parse buffer metrics");
 695         goto fail;
 696     }
 697     period_size = frag_size/frame_size;
 698
 699     if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
 700         pa_log("Failed to parse mmap argument.");
 701         goto fail;
 702     }
 703
 704     u = pa_xnew0(struct userdata, 1);
 705     u->core = c;
 706     u->module = m;
 707     m->userdata = u;
 708     u->use_mmap = use_mmap;
 709     pa_assert_se(u->asyncmsgq = pa_asyncmsgq_new(0));
 710
 711     snd_config_update_free_global();
 712     if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
 713         pa_log("Error opening PCM device %s: %s", dev, snd_strerror(err));
 714         goto fail;
 715     }
 716
 717     u->device_name = pa_xstrdup(dev);
 718
 719     if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
 720         (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
 721         pa_log("Error fetching PCM info: %s", snd_strerror(err));
 722         goto fail;
 723     }
 724
 725     b = use_mmap;
 726     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
 727         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
 728         goto fail;
 729     }
 730
 731     if (use_mmap && !b) {
 732         pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
 733         u->use_mmap = use_mmap = b;
 734     }
 735
 736     if (u->use_mmap)
 737         pa_log_info("Successfully enabled mmap() mode.");
 738
 739     if ((err = pa_alsa_set_sw_params(u->pcm_handle)) < 0) {
 740         pa_log("Failed to set software parameters: %s", snd_strerror(err));
 741         goto fail;
 742     }
 743
 744     /* ALSA might tweak the sample spec, so recalculate the frame size */
 745     frame_size = pa_frame_size(&ss);
 746
 747     if (ss.channels != map.channels)
 748         /* Seems ALSA didn't like the channel number, so let's fix the channel map */
 749         pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
 750
 751     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
 752         pa_log("Error opening mixer: %s", snd_strerror(err));
 753     else {
 754
 755         if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 756             !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture", NULL))) {
 757             snd_mixer_close(u->mixer_handle);
 758             u->mixer_handle = NULL;
 759         }
 760     }
 761
 762     if ((name = pa_modargs_get_value(ma, "source_name", NULL)))
 763         namereg_fail = 1;
 764     else {
 765         name = name_buf = pa_sprintf_malloc("alsa_input.%s", dev);
 766         namereg_fail = 0;
 767     }
 768
 769     u->source = pa_source_new(c, __FILE__, name, namereg_fail, &ss, &map);
 770     pa_xfree(name_buf);
 771
 772     if (!u->source) {
 773         pa_log("Failed to create source object");
 774         goto fail;
 775     }
 776
 777     u->source->parent.process_msg = source_process_msg;
 778     u->source->userdata = u;
 779
 780     pa_source_set_module(u->source, m);
 781     pa_source_set_asyncmsgq(u->source, u->asyncmsgq);
 782     pa_source_set_description(u->source, t = pa_sprintf_malloc(
 783                                       "ALSA PCM on %s (%s)",
 784                                       dev,
 785                                       snd_pcm_info_get_name(pcm_info)));
 786     pa_xfree(t);
 787
 788     u->source->is_hardware = 1;
 789
 790     u->frame_size = frame_size;
 791     u->fragment_size = frag_size = period_size * frame_size;
 792     u->nfragments = nfrags;
 793     u->hwbuf_size = u->fragment_size * nfrags;
 794
 795     pa_log_info("Using %u fragments of size %lu bytes.", nfrags, (long unsigned) u->fragment_size);
 796
 797     if (u->mixer_handle) {
 798         assert(u->mixer_elem);
 799
 800         if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
 801             int i;
 802
 803             for (i = 0;i < ss.channels;i++) {
 804                 if (!snd_mixer_selem_has_capture_channel(u->mixer_elem, i))
 805                     break;
 806             }
 807
 808             if (i == ss.channels) {
 809                 u->source->get_volume = source_get_volume_cb;
 810                 u->source->set_volume = source_set_volume_cb;
 811                 snd_mixer_selem_get_capture_volume_range(u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 812             }
 813         }
 814
 815         if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
 816             u->source->get_mute = source_get_mute_cb;
 817             u->source->set_mute = source_set_mute_cb;
 818         }
 819
 820         u->mixer_fdl = pa_alsa_fdlist_new();
 821
 822         if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
 823             pa_log("failed to initialise file descriptor monitoring");
 824             goto fail;
 825         }
 826
 827         snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
 828         snd_mixer_elem_set_callback_private(u->mixer_elem, u);
 829     } else
 830         u->mixer_fdl = NULL;
 831
 832     if (!(u->thread = pa_thread_new(thread_func, u))) {
 833         pa_log("Failed to create thread.");
 834         goto fail;
 835     }
 836     /* Get initial mixer settings */
 837     if (u->source->get_volume)
 838         u->source->get_volume(u->source);
 839     if (u->source->get_mute)
 840         u->source->get_mute(u->source);
 841
 842     snd_pcm_start(u->pcm_handle);
 843
 844     ret = 0;
 845
 846 finish:
 847
 848     if (ma)
 849         pa_modargs_free(ma);
 850
 851     if (pcm_info)
 852         snd_pcm_info_free(pcm_info);
 853
 854     return ret;
 855
 856 fail:
 857
 858     if (u)
 859         pa__done(c, m);
 860
 861     goto finish;
 862 }
 863
 864 void pa__done(pa_core *c, pa_module*m) {
 865     struct userdata *u;
 866
 867     pa_assert(c);
 868     pa_assert(m);
 869
 870     if (!(u = m->userdata))
 871         return;
 872
 873     if (u->source)
 874         pa_source_disconnect(u->source);
 875
 876     if (u->thread) {
 877         pa_asyncmsgq_send(u->asyncmsgq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 878         pa_thread_free(u->thread);
 879     }
 880
 881     if (u->asyncmsgq)
 882         pa_asyncmsgq_free(u->asyncmsgq);
 883
 884     if (u->source)
 885         pa_source_unref(u->source);
 886
 887     if (u->mixer_fdl)
 888         pa_alsa_fdlist_free(u->mixer_fdl);
 889
 890     if (u->mixer_handle)
 891         snd_mixer_close(u->mixer_handle);
 892
 893     if (u->pcm_handle) {
 894         snd_pcm_drop(u->pcm_handle);
 895         snd_pcm_close(u->pcm_handle);
 896     }
 897
 898     pa_xfree(u->device_name);
 899     pa_xfree(u);
 900
 901     snd_config_update_free_global();
 902 }
 903