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/oss-util.h>
  44 #include <polypcore/sample-util.h>
  45 #include <polypcore/util.h>
  46 #include <polypcore/modargs.h>
  47 #include <polypcore/xmalloc.h>
  48 #include <polypcore/log.h>
  49
  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("sink_name=<name for the sink> source_name=<name for the source> device=<OSS device> record=<enable source?> playback=<enable sink?> format=<sample format> channels=<number of channels> rate=<sample rate> fragments=<number of fragments> fragment_size=<fragment size>")
  56
  57 struct userdata {
  58     pa_sink *sink;
  59     pa_source *source;
  60     pa_core *core;
  61     pa_sample_spec sample_spec;
  62
  63     size_t in_fragment_size, out_fragment_size, in_fragments, out_fragments, out_fill;
  64
  65     int fd;
  66
  67     void *in_mmap, *out_mmap;
  68     size_t in_mmap_length, out_mmap_length;
  69
  70     pa_io_event *io_event;
  71
  72     pa_memblock **in_memblocks, **out_memblocks;
  73     unsigned out_current, in_current;
  74     pa_module *module;
  75 };
  76
  77 static const char* const valid_modargs[] = {
  78     "sink_name",
  79     "source_name",
  80     "device",
  81     "record",
  82     "playback",
  83     "fragments",
  84     "fragment_size",
  85     "format",
  86     "rate",
  87     "channels",
  88     NULL
  89 };
  90
  91 #define DEFAULT_SINK_NAME "oss_output"
  92 #define DEFAULT_SOURCE_NAME "oss_input"
  93 #define DEFAULT_DEVICE "/dev/dsp"
  94
  95 static void update_usage(struct userdata *u) {
  96    pa_module_set_used(u->module,
  97                       (u->sink ? pa_idxset_size(u->sink->inputs) : 0) +
  98                       (u->sink ? pa_idxset_size(u->sink->monitor_source->outputs) : 0) +
  99                       (u->source ? pa_idxset_size(u->source->outputs) : 0));
 100 }
 101
 102 static void out_fill_memblocks(struct userdata *u, unsigned n) {
 103     assert(u && u->out_memblocks);
 104
 105     while (n > 0) {
 106         pa_memchunk chunk;
 107
 108         if (u->out_memblocks[u->out_current])
 109             pa_memblock_unref_fixed(u->out_memblocks[u->out_current]);
 110
 111         chunk.memblock = u->out_memblocks[u->out_current] = pa_memblock_new_fixed((uint8_t*)u->out_mmap+u->out_fragment_size*u->out_current, u->out_fragment_size, 1, u->core->memblock_stat);
 112         assert(chunk.memblock);
 113         chunk.length = chunk.memblock->length;
 114         chunk.index = 0;
 115
 116         pa_sink_render_into_full(u->sink, &chunk);
 117
 118         u->out_current++;
 119         while (u->out_current >= u->out_fragments)
 120             u->out_current -= u->out_fragments;
 121
 122         n--;
 123     }
 124 }
 125
 126 static void do_write(struct userdata *u) {
 127     struct count_info info;
 128     assert(u && u->sink);
 129
 130     update_usage(u);
 131
 132     if (ioctl(u->fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
 133         pa_log(__FILE__": SNDCTL_DSP_GETOPTR: %s\n", strerror(errno));
 134         return;
 135     }
 136
 137     u->out_fill = (u->out_fragment_size * u->out_fragments) - (info.ptr % u->out_fragment_size);
 138
 139     if (!info.blocks)
 140         return;
 141
 142     out_fill_memblocks(u, info.blocks);
 143 }
 144
 145 static void in_post_memblocks(struct userdata *u, unsigned n) {
 146     assert(u && u->in_memblocks);
 147
 148     while (n > 0) {
 149         pa_memchunk chunk;
 150
 151         if (!u->in_memblocks[u->in_current]) {
 152             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);
 153             chunk.length = chunk.memblock->length;
 154             chunk.index = 0;
 155
 156             pa_source_post(u->source, &chunk);
 157         }
 158
 159         u->in_current++;
 160         while (u->in_current >= u->in_fragments)
 161             u->in_current -= u->in_fragments;
 162
 163         n--;
 164     }
 165 }
 166
 167 static void in_clear_memblocks(struct userdata*u, unsigned n) {
 168     unsigned i = u->in_current;
 169     assert(u && u->in_memblocks);
 170
 171     if (n > u->in_fragments)
 172         n = u->in_fragments;
 173
 174     while (n > 0) {
 175         if (u->in_memblocks[i]) {
 176             pa_memblock_unref_fixed(u->in_memblocks[i]);
 177             u->in_memblocks[i] = NULL;
 178         }
 179
 180         i++;
 181         while (i >= u->in_fragments)
 182             i -= u->in_fragments;
 183
 184         n--;
 185     }
 186 }
 187
 188 static void do_read(struct userdata *u) {
 189     struct count_info info;
 190     assert(u && u->source);
 191
 192     update_usage(u);
 193
 194     if (ioctl(u->fd, SNDCTL_DSP_GETIPTR, &info) < 0) {
 195         pa_log(__FILE__": SNDCTL_DSP_GETIPTR: %s\n", strerror(errno));
 196         return;
 197     }
 198
 199     if (!info.blocks)
 200         return;
 201
 202     in_post_memblocks(u, info.blocks);
 203     in_clear_memblocks(u, u->in_fragments/2);
 204 }
 205
 206 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) {
 207     struct userdata *u = userdata;
 208     assert (u && u->core->mainloop == m && u->io_event == e);
 209
 210     if (f & PA_IO_EVENT_INPUT)
 211         do_read(u);
 212     if (f & PA_IO_EVENT_OUTPUT)
 213         do_write(u);
 214 }
 215
 216 static pa_usec_t sink_get_latency_cb(pa_sink *s) {
 217     struct userdata *u = s->userdata;
 218     assert(s && u);
 219
 220     do_write(u);
 221     return pa_bytes_to_usec(u->out_fill, &s->sample_spec);
 222 }
 223
 224 int pa__init(pa_core *c, pa_module*m) {
 225     struct audio_buf_info info;
 226     struct userdata *u = NULL;
 227     const char *p;
 228     int nfrags, frag_size;
 229     int mode, caps;
 230     int enable_bits = 0, zero = 0;
 231     int playback = 1, record = 1;
 232     pa_modargs *ma = NULL;
 233     assert(c && m);
 234
 235     m->userdata = u = pa_xmalloc0(sizeof(struct userdata));
 236     u->module = m;
 237     u->fd = -1;
 238     u->core = c;
 239
 240     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 241         pa_log(__FILE__": failed to parse module arguments.\n");
 242         goto fail;
 243     }
 244
 245     if (pa_modargs_get_value_boolean(ma, "record", &record) < 0 || pa_modargs_get_value_boolean(ma, "playback", &playback) < 0) {
 246         pa_log(__FILE__": record= and playback= expect numeric arguments.\n");
 247         goto fail;
 248     }
 249
 250     if (!playback && !record) {
 251         pa_log(__FILE__": neither playback nor record enabled for device.\n");
 252         goto fail;
 253     }
 254
 255     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 256
 257     nfrags = 12;
 258     frag_size = 1024;
 259     if (pa_modargs_get_value_s32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_s32(ma, "fragment_size", &frag_size) < 0) {
 260         pa_log(__FILE__": failed to parse fragments arguments\n");
 261         goto fail;
 262     }
 263
 264     u->sample_spec = c->default_sample_spec;
 265     if (pa_modargs_get_sample_spec(ma, &u->sample_spec) < 0) {
 266         pa_log(__FILE__": failed to parse sample specification\n");
 267         goto fail;
 268     }
 269
 270     if ((u->fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, &caps)) < 0)
 271         goto fail;
 272
 273     if (!(caps & DSP_CAP_MMAP) || !(caps & DSP_CAP_REALTIME) || !(caps & DSP_CAP_TRIGGER)) {
 274         pa_log(__FILE__": OSS device not mmap capable.\n");
 275         goto fail;
 276     }
 277
 278     pa_log(__FILE__": device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 279
 280     if (nfrags >= 2 && frag_size >= 1)
 281         if (pa_oss_set_fragments(u->fd, nfrags, frag_size) < 0)
 282             goto fail;
 283
 284     if (pa_oss_auto_format(u->fd, &u->sample_spec) < 0)
 285         goto fail;
 286
 287     if (mode != O_WRONLY) {
 288         if (ioctl(u->fd, SNDCTL_DSP_GETISPACE, &info) < 0) {
 289             pa_log(__FILE__": SNDCTL_DSP_GETISPACE: %s\n", strerror(errno));
 290             goto fail;
 291         }
 292
 293         pa_log_info(__FILE__": input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 294         u->in_mmap_length = (u->in_fragment_size = info.fragsize) * (u->in_fragments = info.fragstotal);
 295
 296         if ((u->in_mmap = mmap(NULL, u->in_mmap_length, PROT_READ, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
 297             if (mode == O_RDWR) {
 298                 pa_log(__FILE__": mmap failed for input. Changing to O_WRONLY mode.\n");
 299                 mode = O_WRONLY;
 300             } else {
 301                 pa_log(__FILE__": mmap(): %s\n", strerror(errno));
 302                 goto fail;
 303             }
 304         } else {
 305
 306             u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &u->sample_spec, NULL);
 307             assert(u->source);
 308             u->source->userdata = u;
 309             pa_source_set_owner(u->source, m);
 310             u->source->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 311
 312             u->in_memblocks = pa_xmalloc0(sizeof(pa_memblock *)*u->in_fragments);
 313
 314             enable_bits |= PCM_ENABLE_INPUT;
 315         }
 316     }
 317
 318     if (mode != O_RDONLY) {
 319         if (ioctl(u->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
 320             pa_log(__FILE__": SNDCTL_DSP_GETOSPACE: %s\n", strerror(errno));
 321             goto fail;
 322         }
 323
 324         pa_log_info(__FILE__": output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 325         u->out_mmap_length = (u->out_fragment_size = info.fragsize) * (u->out_fragments = info.fragstotal);
 326
 327         if ((u->out_mmap = mmap(NULL, u->out_mmap_length, PROT_WRITE, MAP_SHARED, u->fd, 0))  == MAP_FAILED) {
 328             if (mode == O_RDWR) {
 329                 pa_log(__FILE__": mmap filed for output. Changing to O_RDONLY mode.\n");
 330                 mode = O_RDONLY;
 331             } else {
 332                 pa_log(__FILE__": mmap(): %s\n", strerror(errno));
 333                 goto fail;
 334             }
 335         } else {
 336             pa_silence_memory(u->out_mmap, u->out_mmap_length, &u->sample_spec);
 337
 338             u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &u->sample_spec, NULL);
 339             assert(u->sink);
 340             u->sink->get_latency = sink_get_latency_cb;
 341             u->sink->userdata = u;
 342             pa_sink_set_owner(u->sink, m);
 343             u->sink->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 344
 345             u->out_memblocks = pa_xmalloc0(sizeof(struct memblock *)*u->out_fragments);
 346
 347             enable_bits |= PCM_ENABLE_OUTPUT;
 348         }
 349     }
 350
 351     zero = 0;
 352     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &zero) < 0) {
 353         pa_log(__FILE__": SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 354         goto fail;
 355     }
 356
 357     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &enable_bits) < 0) {
 358         pa_log(__FILE__": SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 359         goto fail;
 360     }
 361
 362     assert(u->source || u->sink);
 363
 364     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);
 365     assert(u->io_event);
 366
 367     pa_modargs_free(ma);
 368
 369     return 0;
 370
 371 fail:
 372     pa__done(c, m);
 373
 374     if (ma)
 375         pa_modargs_free(ma);
 376
 377     return -1;
 378 }
 379
 380 void pa__done(pa_core *c, pa_module*m) {
 381     struct userdata *u;
 382     assert(c && m);
 383
 384     if (!(u = m->userdata))
 385         return;
 386
 387     if (u->out_memblocks) {
 388         unsigned i;
 389         for (i = 0; i < u->out_fragments; i++)
 390             if (u->out_memblocks[i])
 391                 pa_memblock_unref_fixed(u->out_memblocks[i]);
 392         pa_xfree(u->out_memblocks);
 393     }
 394
 395     if (u->in_memblocks) {
 396         unsigned i;
 397         for (i = 0; i < u->in_fragments; i++)
 398             if (u->in_memblocks[i])
 399                 pa_memblock_unref_fixed(u->in_memblocks[i]);
 400         pa_xfree(u->in_memblocks);
 401     }
 402
 403     if (u->in_mmap && u->in_mmap != MAP_FAILED)
 404         munmap(u->in_mmap, u->in_mmap_length);
 405
 406     if (u->out_mmap && u->out_mmap != MAP_FAILED)
 407         munmap(u->out_mmap, u->out_mmap_length);
 408
 409     if (u->sink) {
 410         pa_sink_disconnect(u->sink);
 411         pa_sink_unref(u->sink);
 412     }
 413
 414     if (u->source) {
 415         pa_source_disconnect(u->source);
 416         pa_source_unref(u->source);
 417     }
 418
 419     if (u->io_event)
 420         u->core->mainloop->io_free(u->io_event);
 421
 422     if (u->fd >= 0)
 423         close(u->fd);
 424
 425     pa_xfree(u);
 426 }