code.delx.au - pulseaudio/blob - polyp/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 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 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 "iochannel.h"
  40 #include "sink.h"
  41 #include "source.h"
  42 #include "module.h"
  43 #include "oss-util.h"
  44 #include "sample-util.h"
  45 #include "util.h"
  46 #include "modargs.h"
  47 #include "xmalloc.h"
  48 #include "log.h"
  49 #include "module-oss-mmap-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering")
  52 PA_MODULE_DESCRIPTION("OSS Sink/Source (mmap)")
  53 PA_MODULE_VERSION(PACKAGE_VERSION)
  54 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>")
  55
  56 struct userdata {
  57     struct pa_sink *sink;
  58     struct pa_source *source;
  59     struct pa_core *core;
  60     struct pa_sample_spec sample_spec;
  61
  62     size_t in_fragment_size, out_fragment_size, in_fragments, out_fragments, out_fill;
  63
  64     int fd;
  65
  66     void *in_mmap, *out_mmap;
  67     size_t in_mmap_length, out_mmap_length;
  68
  69     struct pa_io_event *io_event;
  70
  71     struct pa_memblock **in_memblocks, **out_memblocks;
  72     unsigned out_current, in_current;
  73     struct pa_module *module;
  74 };
  75
  76 static const char* const valid_modargs[] = {
  77     "sink_name",
  78     "source_name",
  79     "device",
  80     "record",
  81     "playback",
  82     "fragments",
  83     "fragment_size",
  84     "format",
  85     "rate",
  86     "channels",
  87     NULL
  88 };
  89
  90 #define DEFAULT_SINK_NAME "oss_output"
  91 #define DEFAULT_SOURCE_NAME "oss_input"
  92 #define DEFAULT_DEVICE "/dev/dsp"
  93
  94 static void update_usage(struct userdata *u) {
  95    pa_module_set_used(u->module,
  96                       (u->sink ? pa_idxset_ncontents(u->sink->inputs) : 0) +
  97                       (u->sink ? pa_idxset_ncontents(u->sink->monitor_source->outputs) : 0) +
  98                       (u->source ? pa_idxset_ncontents(u->source->outputs) : 0));
  99 }
 100
 101 static void out_fill_memblocks(struct userdata *u, unsigned n) {
 102     assert(u && u->out_memblocks);
 103
 104     while (n > 0) {
 105         struct pa_memchunk chunk;
 106
 107         if (u->out_memblocks[u->out_current])
 108             pa_memblock_unref_fixed(u->out_memblocks[u->out_current]);
 109
 110         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, u->core->memblock_stat);
 111         assert(chunk.memblock);
 112         chunk.length = chunk.memblock->length;
 113         chunk.index = 0;
 114
 115         pa_sink_render_into_full(u->sink, &chunk);
 116
 117         u->out_current++;
 118         while (u->out_current >= u->out_fragments)
 119             u->out_current -= u->out_fragments;
 120
 121         n--;
 122     }
 123 }
 124
 125 static void do_write(struct userdata *u) {
 126     struct count_info info;
 127     assert(u && u->sink);
 128
 129     update_usage(u);
 130
 131     if (ioctl(u->fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
 132         pa_log(__FILE__": SNDCTL_DSP_GETOPTR: %s\n", strerror(errno));
 133         return;
 134     }
 135
 136     u->out_fill = (u->out_fragment_size * u->out_fragments) - (info.ptr % u->out_fragment_size);
 137
 138     if (!info.blocks)
 139         return;
 140
 141     out_fill_memblocks(u, info.blocks);
 142 }
 143
 144 static void in_post_memblocks(struct userdata *u, unsigned n) {
 145     assert(u && u->in_memblocks);
 146
 147     while (n > 0) {
 148         struct pa_memchunk chunk;
 149
 150         if (!u->in_memblocks[u->in_current]) {
 151             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, u->core->memblock_stat);
 152             chunk.length = chunk.memblock->length;
 153             chunk.index = 0;
 154
 155             pa_source_post(u->source, &chunk);
 156         }
 157
 158         u->in_current++;
 159         while (u->in_current >= u->in_fragments)
 160             u->in_current -= u->in_fragments;
 161
 162         n--;
 163     }
 164 }
 165
 166 static void in_clear_memblocks(struct userdata*u, unsigned n) {
 167     unsigned i = u->in_current;
 168     assert(u && u->in_memblocks);
 169
 170     if (n > u->in_fragments)
 171         n = u->in_fragments;
 172
 173     while (n > 0) {
 174         if (u->in_memblocks[i]) {
 175             pa_memblock_unref_fixed(u->in_memblocks[i]);
 176             u->in_memblocks[i] = NULL;
 177         }
 178
 179         i++;
 180         while (i >= u->in_fragments)
 181             i -= u->in_fragments;
 182
 183         n--;
 184     }
 185 }
 186
 187 static void do_read(struct userdata *u) {
 188     struct count_info info;
 189     assert(u && u->source);
 190
 191     update_usage(u);
 192
 193     if (ioctl(u->fd, SNDCTL_DSP_GETIPTR, &info) < 0) {
 194         pa_log(__FILE__": SNDCTL_DSP_GETIPTR: %s\n", strerror(errno));
 195         return;
 196     }
 197
 198     if (!info.blocks)
 199         return;
 200
 201     in_post_memblocks(u, info.blocks);
 202     in_clear_memblocks(u, u->in_fragments/2);
 203 }
 204
 205 static void io_callback(struct pa_mainloop_api *m, struct pa_io_event *e, int fd, enum pa_io_event_flags f, void *userdata) {
 206     struct userdata *u = userdata;
 207     assert (u && u->core->mainloop == m && u->io_event == e);
 208
 209     if (f & PA_IO_EVENT_INPUT)
 210         do_read(u);
 211     if (f & PA_IO_EVENT_OUTPUT)
 212         do_write(u);
 213 }
 214
 215 static pa_usec_t sink_get_latency_cb(struct pa_sink *s) {
 216     struct userdata *u = s->userdata;
 217     assert(s && u);
 218
 219     do_write(u);
 220     return pa_bytes_to_usec(u->out_fill, &s->sample_spec);
 221 }
 222
 223 int pa__init(struct pa_core *c, struct pa_module*m) {
 224     struct audio_buf_info info;
 225     struct userdata *u = NULL;
 226     const char *p;
 227     int nfrags, frag_size;
 228     int mode, caps;
 229     int enable_bits = 0, zero = 0;
 230     int playback = 1, record = 1;
 231     struct pa_modargs *ma = NULL;
 232     assert(c && m);
 233
 234     m->userdata = u = pa_xmalloc0(sizeof(struct userdata));
 235     u->module = m;
 236     u->fd = -1;
 237     u->core = c;
 238
 239     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 240         pa_log(__FILE__": failed to parse module arguments.\n");
 241         goto fail;
 242     }
 243
 244     if (pa_modargs_get_value_boolean(ma, "record", &record) < 0 || pa_modargs_get_value_boolean(ma, "playback", &playback) < 0) {
 245         pa_log(__FILE__": record= and playback= expect numeric arguments.\n");
 246         goto fail;
 247     }
 248
 249     if (!playback && !record) {
 250         pa_log(__FILE__": neither playback nor record enabled for device.\n");
 251         goto fail;
 252     }
 253
 254     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 255
 256     nfrags = 12;
 257     frag_size = 1024;
 258     if (pa_modargs_get_value_s32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_s32(ma, "fragment_size", &frag_size) < 0) {
 259         pa_log(__FILE__": failed to parse fragments arguments\n");
 260         goto fail;
 261     }
 262
 263     u->sample_spec = c->default_sample_spec;
 264     if (pa_modargs_get_sample_spec(ma, &u->sample_spec) < 0) {
 265         pa_log(__FILE__": failed to parse sample specification\n");
 266         goto fail;
 267     }
 268
 269     if ((u->fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, &caps)) < 0)
 270         goto fail;
 271
 272     if (!(caps & DSP_CAP_MMAP) || !(caps & DSP_CAP_REALTIME) || !(caps & DSP_CAP_TRIGGER)) {
 273         pa_log(__FILE__": OSS device not mmap capable.\n");
 274         goto fail;
 275     }
 276
 277     pa_log(__FILE__": device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 278
 279     if (nfrags >= 2 && frag_size >= 1)
 280         if (pa_oss_set_fragments(u->fd, nfrags, frag_size) < 0)
 281             goto fail;
 282
 283     if (pa_oss_auto_format(u->fd, &u->sample_spec) < 0)
 284         goto fail;
 285
 286     if (mode != O_WRONLY) {
 287         if (ioctl(u->fd, SNDCTL_DSP_GETISPACE, &info) < 0) {
 288             pa_log(__FILE__": SNDCTL_DSP_GETISPACE: %s\n", strerror(errno));
 289             goto fail;
 290         }
 291
 292         pa_log(__FILE__": input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 293         u->in_mmap_length = (u->in_fragment_size = info.fragsize) * (u->in_fragments = info.fragstotal);
 294
 295         if ((u->in_mmap = mmap(NULL, u->in_mmap_length, PROT_READ, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
 296             if (mode == O_RDWR) {
 297                 pa_log(__FILE__": mmap failed for input. Changing to O_WRONLY mode.\n");
 298                 mode = O_WRONLY;
 299             } else {
 300                 pa_log(__FILE__": mmap(): %s\n", strerror(errno));
 301                 goto fail;
 302             }
 303         } else {
 304
 305             u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &u->sample_spec);
 306             assert(u->source);
 307             u->source->userdata = u;
 308             pa_source_set_owner(u->source, m);
 309             u->source->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 310
 311             u->in_memblocks = pa_xmalloc0(sizeof(struct pa_memblock *)*u->in_fragments);
 312
 313             enable_bits |= PCM_ENABLE_INPUT;
 314         }
 315     }
 316
 317     if (mode != O_RDONLY) {
 318         if (ioctl(u->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
 319             pa_log(__FILE__": SNDCTL_DSP_GETOSPACE: %s\n", strerror(errno));
 320             goto fail;
 321         }
 322
 323         pa_log(__FILE__": output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 324         u->out_mmap_length = (u->out_fragment_size = info.fragsize) * (u->out_fragments = info.fragstotal);
 325
 326         if ((u->out_mmap = mmap(NULL, u->out_mmap_length, PROT_WRITE, MAP_SHARED, u->fd, 0))  == MAP_FAILED) {
 327             if (mode == O_RDWR) {
 328                 pa_log(__FILE__": mmap filed for output. Changing to O_RDONLY mode.\n");
 329                 mode = O_RDONLY;
 330             } else {
 331                 pa_log(__FILE__": mmap(): %s\n", strerror(errno));
 332                 goto fail;
 333             }
 334         } else {
 335             pa_silence_memory(u->out_mmap, u->out_mmap_length, &u->sample_spec);
 336
 337             u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &u->sample_spec);
 338             assert(u->sink);
 339             u->sink->get_latency = sink_get_latency_cb;
 340             u->sink->userdata = u;
 341             pa_sink_set_owner(u->sink, m);
 342             u->sink->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 343
 344             u->out_memblocks = pa_xmalloc0(sizeof(struct memblock *)*u->out_fragments);
 345
 346             enable_bits |= PCM_ENABLE_OUTPUT;
 347         }
 348     }
 349
 350     zero = 0;
 351     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &zero) < 0) {
 352         pa_log(__FILE__": SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 353         goto fail;
 354     }
 355
 356     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &enable_bits) < 0) {
 357         pa_log(__FILE__": SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 358         goto fail;
 359     }
 360
 361     assert(u->source || u->sink);
 362
 363     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);
 364     assert(u->io_event);
 365
 366     pa_modargs_free(ma);
 367
 368     return 0;
 369
 370 fail:
 371     pa__done(c, m);
 372
 373     if (ma)
 374         pa_modargs_free(ma);
 375
 376     return -1;
 377 }
 378
 379 void pa__done(struct pa_core *c, struct pa_module*m) {
 380     struct userdata *u;
 381     assert(c && m);
 382
 383     if (!(u = m->userdata))
 384         return;
 385
 386     if (u->out_memblocks) {
 387         unsigned i;
 388         for (i = 0; i < u->out_fragments; i++)
 389             if (u->out_memblocks[i])
 390                 pa_memblock_unref_fixed(u->out_memblocks[i]);
 391         pa_xfree(u->out_memblocks);
 392     }
 393
 394     if (u->in_memblocks) {
 395         unsigned i;
 396         for (i = 0; i < u->in_fragments; i++)
 397             if (u->in_memblocks[i])
 398                 pa_memblock_unref_fixed(u->in_memblocks[i]);
 399         pa_xfree(u->in_memblocks);
 400     }
 401
 402     if (u->in_mmap && u->in_mmap != MAP_FAILED)
 403         munmap(u->in_mmap, u->in_mmap_length);
 404
 405     if (u->out_mmap && u->out_mmap != MAP_FAILED)
 406         munmap(u->out_mmap, u->out_mmap_length);
 407
 408     if (u->sink) {
 409         pa_sink_disconnect(u->sink);
 410         pa_sink_unref(u->sink);
 411     }
 412
 413     if (u->source) {
 414         pa_source_disconnect(u->source);
 415         pa_source_unref(u->source);
 416     }
 417
 418     if (u->io_event)
 419         u->core->mainloop->io_free(u->io_event);
 420
 421     if (u->fd >= 0)
 422         close(u->fd);
 423
 424     pa_xfree(u);
 425 }