code.delx.au - pulseaudio/blob - src/modules/module-oss-mmap.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/soundcard.h>
  27 #include <sys/ioctl.h>
  28 #include <stdlib.h>
  29 #include <sys/stat.h>
  30 #include <stdio.h>
  31 #include <assert.h>
  32 #include <errno.h>
  33 #include <string.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <limits.h>
  37 #include <sys/mman.h>
  38
  39 #include <polypcore/iochannel.h>
  40 #include <polypcore/sink.h>
  41 #include <polypcore/source.h>
  42 #include <polypcore/module.h>
  43 #include <polypcore/sample-util.h>
  44 #include <polypcore/util.h>
  45 #include <polypcore/modargs.h>
  46 #include <polypcore/xmalloc.h>
  47 #include <polypcore/log.h>
  48
  49 #include "oss-util.h"
  50 #include "module-oss-mmap-symdef.h"
  51
  52 PA_MODULE_AUTHOR("Lennart Poettering")
  53 PA_MODULE_DESCRIPTION("OSS Sink/Source (mmap)")
  54 PA_MODULE_VERSION(PACKAGE_VERSION)
  55 PA_MODULE_USAGE(
  56         "sink_name=<name for the sink> "
  57         "source_name=<name for the source> "
  58         "device=<OSS device> "
  59         "record=<enable source?> "
  60         "playback=<enable sink?> "
  61         "format=<sample format> "
  62         "channels=<number of channels> "
  63         "rate=<sample rate> "
  64         "fragments=<number of fragments> "
  65         "fragment_size=<fragment size> "
  66         "channel_map=<channel map>")
  67
  68 struct userdata {
  69     pa_sink *sink;
  70     pa_source *source;
  71     pa_core *core;
  72     pa_sample_spec sample_spec;
  73
  74     size_t in_fragment_size, out_fragment_size;
  75     unsigned in_fragments, out_fragments;
  76     unsigned out_blocks_saved, in_blocks_saved;
  77
  78     int fd;
  79
  80     void *in_mmap, *out_mmap;
  81     size_t in_mmap_length, out_mmap_length;
  82
  83     pa_io_event *io_event;
  84
  85     pa_memblock **in_memblocks, **out_memblocks;
  86     unsigned out_current, in_current;
  87     pa_module *module;
  88 };
  89
  90 static const char* const valid_modargs[] = {
  91     "sink_name",
  92     "source_name",
  93     "device",
  94     "record",
  95     "playback",
  96     "fragments",
  97     "fragment_size",
  98     "format",
  99     "rate",
 100     "channels",
 101     "channel_map",
 102     NULL
 103 };
 104
 105 #define DEFAULT_SINK_NAME "oss_output"
 106 #define DEFAULT_SOURCE_NAME "oss_input"
 107 #define DEFAULT_DEVICE "/dev/dsp"
 108 #define DEFAULT_NFRAGS 12
 109 #define DEFAULT_FRAGSIZE 1024
 110
 111 static void update_usage(struct userdata *u) {
 112    pa_module_set_used(u->module,
 113                       (u->sink ? pa_idxset_size(u->sink->inputs) : 0) +
 114                       (u->sink ? pa_idxset_size(u->sink->monitor_source->outputs) : 0) +
 115                       (u->source ? pa_idxset_size(u->source->outputs) : 0));
 116 }
 117
 118 static void out_fill_memblocks(struct userdata *u, unsigned n) {
 119     assert(u && u->out_memblocks);
 120
 121     while (n > 0) {
 122         pa_memchunk chunk;
 123
 124         if (u->out_memblocks[u->out_current])
 125             pa_memblock_unref_fixed(u->out_memblocks[u->out_current]);
 126
 127         chunk.memblock = u->out_memblocks[u->out_current] =
 128             pa_memblock_new_fixed(
 129                     (uint8_t*) u->out_mmap+u->out_fragment_size*u->out_current,
 130                     u->out_fragment_size,
 131                     1,
 132                     u->core->memblock_stat);
 133         assert(chunk.memblock);
 134         chunk.length = chunk.memblock->length;
 135         chunk.index = 0;
 136
 137         pa_sink_render_into_full(u->sink, &chunk);
 138
 139         u->out_current++;
 140         while (u->out_current >= u->out_fragments)
 141             u->out_current -= u->out_fragments;
 142
 143         n--;
 144     }
 145 }
 146
 147 static void do_write(struct userdata *u) {
 148     struct count_info info;
 149     assert(u && u->sink);
 150
 151     update_usage(u);
 152
 153     if (ioctl(u->fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
 154         pa_log(__FILE__": SNDCTL_DSP_GETOPTR: %s", strerror(errno));
 155         return;
 156     }
 157
 158     info.blocks += u->out_blocks_saved;
 159     u->out_blocks_saved = 0;
 160
 161     if (!info.blocks)
 162         return;
 163
 164     out_fill_memblocks(u, info.blocks);
 165 }
 166
 167 static void in_post_memblocks(struct userdata *u, unsigned n) {
 168     assert(u && u->in_memblocks);
 169
 170     while (n > 0) {
 171         pa_memchunk chunk;
 172
 173         if (!u->in_memblocks[u->in_current]) {
 174             chunk.memblock = u->in_memblocks[u->in_current] = pa_memblock_new_fixed((uint8_t*) u->in_mmap+u->in_fragment_size*u->in_current, u->in_fragment_size, 1, u->core->memblock_stat);
 175             chunk.length = chunk.memblock->length;
 176             chunk.index = 0;
 177
 178             pa_source_post(u->source, &chunk);
 179         }
 180
 181         u->in_current++;
 182         while (u->in_current >= u->in_fragments)
 183             u->in_current -= u->in_fragments;
 184
 185         n--;
 186     }
 187 }
 188
 189 static void in_clear_memblocks(struct userdata*u, unsigned n) {
 190     unsigned i = u->in_current;
 191     assert(u && u->in_memblocks);
 192
 193     if (n > u->in_fragments)
 194         n = u->in_fragments;
 195
 196     while (n > 0) {
 197         if (u->in_memblocks[i]) {
 198             pa_memblock_unref_fixed(u->in_memblocks[i]);
 199             u->in_memblocks[i] = NULL;
 200         }
 201
 202         i++;
 203         while (i >= u->in_fragments)
 204             i -= u->in_fragments;
 205
 206         n--;
 207     }
 208 }
 209
 210 static void do_read(struct userdata *u) {
 211     struct count_info info;
 212     assert(u && u->source);
 213
 214     update_usage(u);
 215
 216     if (ioctl(u->fd, SNDCTL_DSP_GETIPTR, &info) < 0) {
 217         pa_log(__FILE__": SNDCTL_DSP_GETIPTR: %s", strerror(errno));
 218         return;
 219     }
 220
 221     info.blocks += u->in_blocks_saved;
 222     u->in_blocks_saved = 0;
 223
 224     if (!info.blocks)
 225         return;
 226
 227     in_post_memblocks(u, info.blocks);
 228     in_clear_memblocks(u, u->in_fragments/2);
 229 }
 230
 231 static void io_callback(pa_mainloop_api *m, pa_io_event *e, PA_GCC_UNUSED int fd, pa_io_event_flags_t f, void *userdata) {
 232     struct userdata *u = userdata;
 233     assert (u && u->core->mainloop == m && u->io_event == e);
 234
 235     if (f & PA_IO_EVENT_INPUT)
 236         do_read(u);
 237     if (f & PA_IO_EVENT_OUTPUT)
 238         do_write(u);
 239 }
 240
 241 static pa_usec_t sink_get_latency_cb(pa_sink *s) {
 242     struct userdata *u = s->userdata;
 243     struct count_info info;
 244     size_t bpos, n, total;
 245     assert(s && u);
 246
 247     if (ioctl(u->fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
 248         pa_log(__FILE__": SNDCTL_DSP_GETOPTR: %s", strerror(errno));
 249         return 0;
 250     }
 251
 252     u->out_blocks_saved += info.blocks;
 253
 254     total = u->out_fragments * u->out_fragment_size;
 255     bpos = ((u->out_current + u->out_blocks_saved) * u->out_fragment_size) % total;
 256
 257     if (bpos <= (size_t) info.ptr)
 258         n = total - (info.ptr - bpos);
 259     else
 260         n = bpos - info.ptr;
 261
 262 /*     pa_log("n = %u, bpos = %u, ptr = %u, total=%u, fragsize = %u, n_frags = %u\n", n, bpos, (unsigned) info.ptr, total, u->out_fragment_size, u->out_fragments); */
 263
 264     return pa_bytes_to_usec(n, &s->sample_spec);
 265 }
 266
 267 static pa_usec_t source_get_latency_cb(pa_source *s) {
 268     struct userdata *u = s->userdata;
 269     struct count_info info;
 270     size_t bpos, n, total;
 271     assert(s && u);
 272
 273     if (ioctl(u->fd, SNDCTL_DSP_GETIPTR, &info) < 0) {
 274         pa_log(__FILE__": SNDCTL_DSP_GETIPTR: %s", strerror(errno));
 275         return 0;
 276     }
 277
 278     u->in_blocks_saved += info.blocks;
 279
 280     total = u->in_fragments * u->in_fragment_size;
 281     bpos = ((u->in_current + u->in_blocks_saved) * u->in_fragment_size) % total;
 282
 283     if (bpos <= (size_t) info.ptr)
 284         n = info.ptr - bpos;
 285     else
 286         n = (u->in_fragments * u->in_fragment_size) - bpos + info.ptr;
 287
 288 /*     pa_log("n = %u, bpos = %u, ptr = %u, total=%u, fragsize = %u, n_frags = %u\n", n, bpos, (unsigned) info.ptr, total, u->in_fragment_size, u->in_fragments);  */
 289
 290     return pa_bytes_to_usec(n, &s->sample_spec);
 291 }
 292
 293 static int sink_get_hw_volume(pa_sink *s) {
 294     struct userdata *u = s->userdata;
 295
 296     if (pa_oss_get_pcm_volume(u->fd, &s->sample_spec, &s->hw_volume) < 0) {
 297         pa_log_info(__FILE__": device doesn't support reading mixer settings: %s", strerror(errno));
 298         s->get_hw_volume = NULL;
 299         return -1;
 300     }
 301
 302     return 0;
 303 }
 304
 305 static int sink_set_hw_volume(pa_sink *s) {
 306     struct userdata *u = s->userdata;
 307
 308     if (pa_oss_set_pcm_volume(u->fd, &s->sample_spec, &s->hw_volume) < 0) {
 309         pa_log_info(__FILE__": device doesn't support writing mixer settings: %s", strerror(errno));
 310         s->set_hw_volume = NULL;
 311         return -1;
 312     }
 313
 314     return 0;
 315 }
 316
 317 static int source_get_hw_volume(pa_source *s) {
 318     struct userdata *u = s->userdata;
 319
 320     if (pa_oss_get_input_volume(u->fd, &s->sample_spec, &s->hw_volume) < 0) {
 321         pa_log_info(__FILE__": device doesn't support reading mixer settings: %s", strerror(errno));
 322         s->get_hw_volume = NULL;
 323         return -1;
 324     }
 325
 326     return 0;
 327 }
 328
 329 static int source_set_hw_volume(pa_source *s) {
 330     struct userdata *u = s->userdata;
 331
 332     if (pa_oss_set_input_volume(u->fd, &s->sample_spec, &s->hw_volume) < 0) {
 333         pa_log_info(__FILE__": device doesn't support writing mixer settings: %s", strerror(errno));
 334         s->set_hw_volume = NULL;
 335         return -1;
 336     }
 337
 338     return 0;
 339 }
 340
 341 int pa__init(pa_core *c, pa_module*m) {
 342     struct audio_buf_info info;
 343     struct userdata *u = NULL;
 344     const char *p;
 345     int nfrags, frag_size;
 346     int mode, caps;
 347     int enable_bits = 0, zero = 0;
 348     int playback = 1, record = 1;
 349     pa_modargs *ma = NULL;
 350     char hwdesc[64];
 351     pa_channel_map map;
 352
 353     assert(c);
 354     assert(m);
 355
 356     m->userdata = u = pa_xnew0(struct userdata, 1);
 357     u->module = m;
 358     u->fd = -1;
 359     u->core = c;
 360
 361     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 362         pa_log(__FILE__": failed to parse module arguments.");
 363         goto fail;
 364     }
 365
 366     if (pa_modargs_get_value_boolean(ma, "record", &record) < 0 || pa_modargs_get_value_boolean(ma, "playback", &playback) < 0) {
 367         pa_log(__FILE__": record= and playback= expect numeric arguments.");
 368         goto fail;
 369     }
 370
 371     if (!playback && !record) {
 372         pa_log(__FILE__": neither playback nor record enabled for device.");
 373         goto fail;
 374     }
 375
 376     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 377
 378     nfrags = DEFAULT_NFRAGS;
 379     frag_size = DEFAULT_FRAGSIZE;
 380     if (pa_modargs_get_value_s32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_s32(ma, "fragment_size", &frag_size) < 0) {
 381         pa_log(__FILE__": failed to parse fragments arguments");
 382         goto fail;
 383     }
 384
 385     u->sample_spec = c->default_sample_spec;
 386     if (pa_modargs_get_sample_spec_and_channel_map(ma, &u->sample_spec, &map, PA_CHANNEL_MAP_ALSA) < 0) {
 387         pa_log(__FILE__": failed to parse sample specification or channel map");
 388         goto fail;
 389     }
 390
 391     if ((u->fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, &caps)) < 0)
 392         goto fail;
 393
 394     if (!(caps & DSP_CAP_MMAP) || !(caps & DSP_CAP_REALTIME) || !(caps & DSP_CAP_TRIGGER)) {
 395         pa_log(__FILE__": OSS device not mmap capable.");
 396         goto fail;
 397     }
 398
 399     pa_log_info(__FILE__": device opened in %s mode.", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 400
 401     if (pa_oss_get_hw_description(p, hwdesc, sizeof(hwdesc)) >= 0)
 402         pa_log_info(__FILE__": hardware name is '%s'.", hwdesc);
 403     else
 404         hwdesc[0] = 0;
 405
 406     if (nfrags >= 2 && frag_size >= 1)
 407         if (pa_oss_set_fragments(u->fd, nfrags, frag_size) < 0)
 408             goto fail;
 409
 410     if (pa_oss_auto_format(u->fd, &u->sample_spec) < 0)
 411         goto fail;
 412
 413     if (mode != O_WRONLY) {
 414         if (ioctl(u->fd, SNDCTL_DSP_GETISPACE, &info) < 0) {
 415             pa_log(__FILE__": SNDCTL_DSP_GETISPACE: %s", strerror(errno));
 416             goto fail;
 417         }
 418
 419         pa_log_info(__FILE__": input -- %u fragments of size %u.", info.fragstotal, info.fragsize);
 420         u->in_mmap_length = (u->in_fragment_size = info.fragsize) * (u->in_fragments = info.fragstotal);
 421
 422         if ((u->in_mmap = mmap(NULL, u->in_mmap_length, PROT_READ, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
 423             if (mode == O_RDWR) {
 424                 pa_log(__FILE__": mmap failed for input. Changing to O_WRONLY mode.");
 425                 mode = O_WRONLY;
 426             } else {
 427                 pa_log(__FILE__": mmap(): %s", strerror(errno));
 428                 goto fail;
 429             }
 430         } else {
 431
 432             if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &u->sample_spec, &map)))
 433                 goto fail;
 434
 435             u->source->userdata = u;
 436             u->source->get_latency = source_get_latency_cb;
 437             u->source->get_hw_volume = source_get_hw_volume;
 438             u->source->set_hw_volume = source_set_hw_volume;
 439             pa_source_set_owner(u->source, m);
 440             u->source->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'%s%s%s",
 441                                                        p,
 442                                                        hwdesc[0] ? " (" : "",
 443                                                        hwdesc[0] ? hwdesc : "",
 444                                                        hwdesc[0] ? ")" : "");
 445
 446             u->in_memblocks = pa_xnew0(pa_memblock*, u->in_fragments);
 447
 448             enable_bits |= PCM_ENABLE_INPUT;
 449         }
 450     }
 451
 452     if (mode != O_RDONLY) {
 453         if (ioctl(u->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
 454             pa_log(__FILE__": SNDCTL_DSP_GETOSPACE: %s", strerror(errno));
 455             goto fail;
 456         }
 457
 458         pa_log_info(__FILE__": output -- %u fragments of size %u.", info.fragstotal, info.fragsize);
 459         u->out_mmap_length = (u->out_fragment_size = info.fragsize) * (u->out_fragments = info.fragstotal);
 460
 461         if ((u->out_mmap = mmap(NULL, u->out_mmap_length, PROT_WRITE, MAP_SHARED, u->fd, 0))  == MAP_FAILED) {
 462             if (mode == O_RDWR) {
 463                 pa_log(__FILE__": mmap filed for output. Changing to O_RDONLY mode.");
 464                 mode = O_RDONLY;
 465             } else {
 466                 pa_log(__FILE__": mmap(): %s", strerror(errno));
 467                 goto fail;
 468             }
 469         } else {
 470             pa_silence_memory(u->out_mmap, u->out_mmap_length, &u->sample_spec);
 471
 472             if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &u->sample_spec, &map)))
 473                 goto fail;
 474
 475             u->sink->get_latency = sink_get_latency_cb;
 476             u->sink->get_hw_volume = sink_get_hw_volume;
 477             u->sink->set_hw_volume = sink_set_hw_volume;
 478             u->sink->userdata = u;
 479             pa_sink_set_owner(u->sink, m);
 480             u->sink->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'%s%s%s",
 481                                                      p,
 482                                                      hwdesc[0] ? " (" : "",
 483                                                      hwdesc[0] ? hwdesc : "",
 484                                                      hwdesc[0] ? ")" : "");
 485
 486             u->out_memblocks = pa_xmalloc0(sizeof(struct memblock *)*u->out_fragments);
 487
 488             enable_bits |= PCM_ENABLE_OUTPUT;
 489         }
 490     }
 491
 492     zero = 0;
 493     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &zero) < 0) {
 494         pa_log(__FILE__": SNDCTL_DSP_SETTRIGGER: %s", strerror(errno));
 495         goto fail;
 496     }
 497
 498     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &enable_bits) < 0) {
 499         pa_log(__FILE__": SNDCTL_DSP_SETTRIGGER: %s", strerror(errno));
 500         goto fail;
 501     }
 502
 503     assert(u->source || u->sink);
 504
 505     u->io_event = c->mainloop->io_new(c->mainloop, u->fd, (u->source ? PA_IO_EVENT_INPUT : 0) | (u->sink ? PA_IO_EVENT_OUTPUT : 0), io_callback, u);
 506     assert(u->io_event);
 507
 508     pa_modargs_free(ma);
 509
 510     /* Read mixer settings */
 511     if (u->source)
 512         source_get_hw_volume(u->source);
 513     if (u->sink)
 514         sink_get_hw_volume(u->sink);
 515
 516     return 0;
 517
 518 fail:
 519     pa__done(c, m);
 520
 521     if (ma)
 522         pa_modargs_free(ma);
 523
 524     return -1;
 525 }
 526
 527 void pa__done(pa_core *c, pa_module*m) {
 528     struct userdata *u;
 529
 530     assert(c);
 531     assert(m);
 532
 533     if (!(u = m->userdata))
 534         return;
 535
 536     if (u->out_memblocks) {
 537         unsigned i;
 538         for (i = 0; i < u->out_fragments; i++)
 539             if (u->out_memblocks[i])
 540                 pa_memblock_unref_fixed(u->out_memblocks[i]);
 541         pa_xfree(u->out_memblocks);
 542     }
 543
 544     if (u->in_memblocks) {
 545         unsigned i;
 546         for (i = 0; i < u->in_fragments; i++)
 547             if (u->in_memblocks[i])
 548                 pa_memblock_unref_fixed(u->in_memblocks[i]);
 549         pa_xfree(u->in_memblocks);
 550     }
 551
 552     if (u->in_mmap && u->in_mmap != MAP_FAILED)
 553         munmap(u->in_mmap, u->in_mmap_length);
 554
 555     if (u->out_mmap && u->out_mmap != MAP_FAILED)
 556         munmap(u->out_mmap, u->out_mmap_length);
 557
 558     if (u->sink) {
 559         pa_sink_disconnect(u->sink);
 560         pa_sink_unref(u->sink);
 561     }
 562
 563     if (u->source) {
 564         pa_source_disconnect(u->source);
 565         pa_source_unref(u->source);
 566     }
 567
 568     if (u->io_event)
 569         u->core->mainloop->io_free(u->io_event);
 570
 571     if (u->fd >= 0)
 572         close(u->fd);
 573
 574     pa_xfree(u);
 575 }