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
  49 struct userdata {
  50     struct pa_sink *sink;
  51     struct pa_source *source;
  52     struct pa_core *core;
  53     struct pa_sample_spec sample_spec;
  54
  55     size_t in_fragment_size, out_fragment_size, in_fragments, out_fragments, out_fill;
  56
  57     int fd;
  58
  59     void *in_mmap, *out_mmap;
  60     size_t in_mmap_length, out_mmap_length;
  61
  62     struct pa_io_event *io_event;
  63
  64     struct pa_memblock **in_memblocks, **out_memblocks;
  65     unsigned out_current, in_current;
  66     struct pa_module *module;
  67 };
  68
  69 static const char* const valid_modargs[] = {
  70     "sink_name",
  71     "source_name",
  72     "device",
  73     "record",
  74     "playback",
  75     "fragments",
  76     "fragment_size",
  77     "format",
  78     "rate",
  79     "channels",
  80     NULL
  81 };
  82
  83 #define DEFAULT_SINK_NAME "oss_output"
  84 #define DEFAULT_SOURCE_NAME "oss_input"
  85 #define DEFAULT_DEVICE "/dev/dsp"
  86
  87 static void update_usage(struct userdata *u) {
  88    pa_module_set_used(u->module,
  89                       (u->sink ? pa_idxset_ncontents(u->sink->inputs) : 0) +
  90                       (u->sink ? pa_idxset_ncontents(u->sink->monitor_source->outputs) : 0) +
  91                       (u->source ? pa_idxset_ncontents(u->source->outputs) : 0));
  92 }
  93
  94 static void out_fill_memblocks(struct userdata *u, unsigned n) {
  95     assert(u && u->out_memblocks);
  96
  97     while (n > 0) {
  98         struct pa_memchunk chunk;
  99
 100         if (u->out_memblocks[u->out_current])
 101             pa_memblock_unref_fixed(u->out_memblocks[u->out_current]);
 102
 103         chunk.memblock = u->out_memblocks[u->out_current] = pa_memblock_new_fixed(u->out_mmap+u->out_fragment_size*u->out_current, u->out_fragment_size, u->core->memblock_stat);
 104         assert(chunk.memblock);
 105         chunk.length = chunk.memblock->length;
 106         chunk.index = 0;
 107
 108         pa_sink_render_into_full(u->sink, &chunk);
 109
 110         u->out_current++;
 111         while (u->out_current >= u->out_fragments)
 112             u->out_current -= u->out_fragments;
 113
 114         n--;
 115     }
 116 }
 117
 118 static void do_write(struct userdata *u) {
 119     struct count_info info;
 120     assert(u && u->sink);
 121
 122     update_usage(u);
 123
 124     if (ioctl(u->fd, SNDCTL_DSP_GETOPTR, &info) < 0) {
 125         fprintf(stderr, "SNDCTL_DSP_GETOPTR: %s\n", strerror(errno));
 126         return;
 127     }
 128
 129     u->out_fill = (u->out_fragment_size * u->out_fragments) - (info.ptr % u->out_fragment_size);
 130
 131     if (!info.blocks)
 132         return;
 133
 134     out_fill_memblocks(u, info.blocks);
 135 }
 136
 137 static void in_post_memblocks(struct userdata *u, unsigned n) {
 138     assert(u && u->in_memblocks);
 139
 140     while (n > 0) {
 141         struct pa_memchunk chunk;
 142
 143         if (!u->in_memblocks[u->in_current]) {
 144             chunk.memblock = u->in_memblocks[u->in_current] = pa_memblock_new_fixed(u->in_mmap+u->in_fragment_size*u->in_current, u->in_fragment_size, u->core->memblock_stat);
 145             chunk.length = chunk.memblock->length;
 146             chunk.index = 0;
 147
 148             pa_source_post(u->source, &chunk);
 149         }
 150
 151         u->in_current++;
 152         while (u->in_current >= u->in_fragments)
 153             u->in_current -= u->in_fragments;
 154
 155         n--;
 156     }
 157 }
 158
 159 static void in_clear_memblocks(struct userdata*u, unsigned n) {
 160     unsigned i = u->in_current;
 161     assert(u && u->in_memblocks);
 162
 163     if (n > u->in_fragments)
 164         n = u->in_fragments;
 165
 166     while (n > 0) {
 167         if (u->in_memblocks[i]) {
 168             pa_memblock_unref_fixed(u->in_memblocks[i]);
 169             u->in_memblocks[i] = NULL;
 170         }
 171
 172         i++;
 173         while (i >= u->in_fragments)
 174             i -= u->in_fragments;
 175
 176         n--;
 177     }
 178 }
 179
 180 static void do_read(struct userdata *u) {
 181     struct count_info info;
 182     assert(u && u->source);
 183
 184     update_usage(u);
 185
 186     if (ioctl(u->fd, SNDCTL_DSP_GETIPTR, &info) < 0) {
 187         fprintf(stderr, "SNDCTL_DSP_GETIPTR: %s\n", strerror(errno));
 188         return;
 189     }
 190
 191     if (!info.blocks)
 192         return;
 193
 194     in_post_memblocks(u, info.blocks);
 195     in_clear_memblocks(u, u->in_fragments/2);
 196 }
 197
 198 static void io_callback(struct pa_mainloop_api *m, struct pa_io_event *e, int fd, enum pa_io_event_flags f, void *userdata) {
 199     struct userdata *u = userdata;
 200     assert (u && u->core->mainloop == m && u->io_event == e);
 201
 202     if (f & PA_IO_EVENT_INPUT)
 203         do_read(u);
 204     if (f & PA_IO_EVENT_OUTPUT)
 205         do_write(u);
 206 }
 207
 208 static uint32_t sink_get_latency_cb(struct pa_sink *s) {
 209     struct userdata *u = s->userdata;
 210     assert(s && u);
 211
 212     do_write(u);
 213     return pa_bytes_to_usec(u->out_fill, &s->sample_spec);
 214 }
 215
 216 int pa_module_init(struct pa_core *c, struct pa_module*m) {
 217     struct audio_buf_info info;
 218     struct userdata *u = NULL;
 219     const char *p;
 220     int nfrags, frag_size;
 221     int mode, caps;
 222     int enable_bits = 0, zero = 0;
 223     int playback = 1, record = 1;
 224     struct pa_modargs *ma = NULL;
 225     assert(c && m);
 226
 227     m->userdata = u = pa_xmalloc0(sizeof(struct userdata));
 228     u->module = m;
 229     u->fd = -1;
 230     u->core = c;
 231
 232     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 233         fprintf(stderr, __FILE__": failed to parse module arguments.\n");
 234         goto fail;
 235     }
 236
 237     if (pa_modargs_get_value_u32(ma, "record", &record) < 0 || pa_modargs_get_value_u32(ma, "playback", &playback) < 0) {
 238         fprintf(stderr, __FILE__": record= and playback= expect numeric arguments.\n");
 239         goto fail;
 240     }
 241
 242     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 243     if (mode == 0) {
 244         fprintf(stderr, __FILE__": neither playback nor record enabled for device.\n");
 245         goto fail;
 246     }
 247
 248     nfrags = 12;
 249     frag_size = 1024;
 250     if (pa_modargs_get_value_u32(ma, "fragments", &nfrags) < 0 || nfrags < 2 || pa_modargs_get_value_u32(ma, "fragment_size", &frag_size) < 0 || frag_size < 1) {
 251         fprintf(stderr, __FILE__": failed to parse fragments arguments\n");
 252         goto fail;
 253     }
 254
 255     u->sample_spec = c->default_sample_spec;
 256     if (pa_modargs_get_sample_spec(ma, &u->sample_spec) < 0) {
 257         fprintf(stderr, __FILE__": failed to parse sample specification\n");
 258         goto fail;
 259     }
 260
 261     if ((u->fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, &caps)) < 0)
 262         goto fail;
 263
 264     if (!(caps & DSP_CAP_MMAP) || !(caps & DSP_CAP_REALTIME) || !(caps & DSP_CAP_TRIGGER)) {
 265         fprintf(stderr, "OSS device not mmap capable.\n");
 266         goto fail;
 267     }
 268
 269     fprintf(stderr, "module-oss: device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 270
 271     if (pa_oss_set_fragments(u->fd, nfrags, frag_size) < 0)
 272         goto fail;
 273
 274     if (pa_oss_auto_format(u->fd, &u->sample_spec) < 0)
 275         goto fail;
 276
 277     if (mode != O_WRONLY) {
 278         if (ioctl(u->fd, SNDCTL_DSP_GETISPACE, &info) < 0) {
 279             fprintf(stderr, "SNDCTL_DSP_GETISPACE: %s\n", strerror(errno));
 280             goto fail;
 281         }
 282
 283         fprintf(stderr, "module-oss-mmap: input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 284         u->in_mmap_length = (u->in_fragment_size = info.fragsize) * (u->in_fragments = info.fragstotal);
 285
 286         if ((u->in_mmap = mmap(NULL, u->in_mmap_length, PROT_READ, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
 287             if (mode == O_RDWR) {
 288                 fprintf(stderr, "module-oss-mmap: mmap failed for input. Changing to O_WRONLY mode.\n");
 289                 mode = O_WRONLY;
 290             } else {
 291                 fprintf(stderr, "modeule-oss-mmap: mmap(): %s\n", strerror(errno));
 292                 goto fail;
 293             }
 294         } else {
 295
 296             u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &u->sample_spec);
 297             assert(u->source);
 298             u->source->userdata = u;
 299             pa_source_set_owner(u->source, m);
 300             u->source->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 301
 302             u->in_memblocks = pa_xmalloc0(sizeof(struct pa_memblock *)*u->in_fragments);
 303
 304             enable_bits |= PCM_ENABLE_INPUT;
 305         }
 306     }
 307
 308     if (mode != O_RDONLY) {
 309         if (ioctl(u->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
 310             fprintf(stderr, "SNDCTL_DSP_GETOSPACE: %s\n", strerror(errno));
 311             goto fail;
 312         }
 313
 314         fprintf(stderr, "module-oss: output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 315         u->out_mmap_length = (u->out_fragment_size = info.fragsize) * (u->out_fragments = info.fragstotal);
 316
 317         if ((u->out_mmap = mmap(NULL, u->out_mmap_length, PROT_WRITE, MAP_SHARED, u->fd, 0))  == MAP_FAILED) {
 318             if (mode == O_RDWR) {
 319                 fprintf(stderr, "module-oss-mmap: mmap filed for output. Changing to O_RDONLY mode.\n");
 320                 mode = O_RDONLY;
 321             } else {
 322                 fprintf(stderr, "module-oss-mmap: mmap(): %s\n", strerror(errno));
 323                 goto fail;
 324             }
 325         } else {
 326             pa_silence_memory(u->out_mmap, u->out_mmap_length, &u->sample_spec);
 327
 328             u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &u->sample_spec);
 329             assert(u->sink);
 330             u->sink->get_latency = sink_get_latency_cb;
 331             u->sink->userdata = u;
 332             pa_sink_set_owner(u->sink, m);
 333             u->sink->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 334
 335             u->out_memblocks = pa_xmalloc0(sizeof(struct memblock *)*u->out_fragments);
 336
 337             enable_bits |= PCM_ENABLE_OUTPUT;
 338         }
 339     }
 340
 341     zero = 0;
 342     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &zero) < 0) {
 343         fprintf(stderr, "SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 344         goto fail;
 345     }
 346
 347     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &enable_bits) < 0) {
 348         fprintf(stderr, "SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 349         goto fail;
 350     }
 351
 352     assert(u->source || u->sink);
 353
 354     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);
 355     assert(u->io_event);
 356
 357     pa_modargs_free(ma);
 358
 359     return 0;
 360
 361 fail:
 362     pa_module_done(c, m);
 363
 364     if (ma)
 365         pa_modargs_free(ma);
 366
 367     return -1;
 368 }
 369
 370 void pa_module_done(struct pa_core *c, struct pa_module*m) {
 371     struct userdata *u;
 372     assert(c && m);
 373
 374     if (!(u = m->userdata))
 375         return;
 376
 377     if (u->out_memblocks) {
 378         unsigned i;
 379         for (i = 0; i < u->out_fragments; i++)
 380             if (u->out_memblocks[i])
 381                 pa_memblock_unref_fixed(u->out_memblocks[i]);
 382         pa_xfree(u->out_memblocks);
 383     }
 384
 385     if (u->in_memblocks) {
 386         unsigned i;
 387         for (i = 0; i < u->in_fragments; i++)
 388             if (u->in_memblocks[i])
 389                 pa_memblock_unref_fixed(u->in_memblocks[i]);
 390         pa_xfree(u->in_memblocks);
 391     }
 392
 393     if (u->in_mmap && u->in_mmap != MAP_FAILED)
 394         munmap(u->in_mmap, u->in_mmap_length);
 395
 396     if (u->out_mmap && u->out_mmap != MAP_FAILED)
 397         munmap(u->out_mmap, u->out_mmap_length);
 398
 399     if (u->sink)
 400         pa_sink_free(u->sink);
 401
 402     if (u->source)
 403         pa_source_free(u->source);
 404
 405     if (u->io_event)
 406         u->core->mainloop->io_free(u->io_event);
 407
 408     if (u->fd >= 0)
 409         close(u->fd);
 410
 411     pa_xfree(u);
 412 }