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     void *mainloop_source;
  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);
 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);
 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, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
 199     struct userdata *u = userdata;
 200
 201     assert (u && u->core->mainloop == m && u->mainloop_source == id);
 202
 203     if (events & PA_MAINLOOP_API_IO_EVENT_INPUT)
 204         do_read(u);
 205     if (events & PA_MAINLOOP_API_IO_EVENT_OUTPUT)
 206         do_write(u);
 207 }
 208
 209 static uint32_t sink_get_latency_cb(struct pa_sink *s) {
 210     struct userdata *u = s->userdata;
 211     assert(s && u);
 212
 213     do_write(u);
 214     return pa_bytes_to_usec(u->out_fill, &s->sample_spec);
 215 }
 216
 217 int pa_module_init(struct pa_core *c, struct pa_module*m) {
 218     struct audio_buf_info info;
 219     struct userdata *u = NULL;
 220     const char *p;
 221     int nfrags, frag_size;
 222     int mode, caps;
 223     int enable_bits = 0, zero = 0;
 224     int playback = 1, record = 1;
 225     struct pa_modargs *ma = NULL;
 226     assert(c && m);
 227
 228     m->userdata = u = pa_xmalloc0(sizeof(struct userdata));
 229     u->module = m;
 230     u->fd = -1;
 231     u->core = c;
 232
 233     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 234         fprintf(stderr, __FILE__": failed to parse module arguments.\n");
 235         goto fail;
 236     }
 237
 238     if (pa_modargs_get_value_u32(ma, "record", &record) < 0 || pa_modargs_get_value_u32(ma, "playback", &playback) < 0) {
 239         fprintf(stderr, __FILE__": record= and playback= expect numeric arguments.\n");
 240         goto fail;
 241     }
 242
 243     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 244     if (mode == 0) {
 245         fprintf(stderr, __FILE__": neither playback nor record enabled for device.\n");
 246         goto fail;
 247     }
 248
 249     nfrags = 12;
 250     frag_size = 1024;
 251     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) {
 252         fprintf(stderr, __FILE__": failed to parse fragments arguments\n");
 253         goto fail;
 254     }
 255
 256     u->sample_spec = c->default_sample_spec;
 257     if (pa_modargs_get_sample_spec(ma, &u->sample_spec) < 0) {
 258         fprintf(stderr, __FILE__": failed to parse sample specification\n");
 259         goto fail;
 260     }
 261
 262     if ((u->fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, &caps)) < 0)
 263         goto fail;
 264
 265     if (!(caps & DSP_CAP_MMAP) || !(caps & DSP_CAP_REALTIME) || !(caps & DSP_CAP_TRIGGER)) {
 266         fprintf(stderr, "OSS device not mmap capable.\n");
 267         goto fail;
 268     }
 269
 270     fprintf(stderr, "module-oss: device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 271
 272     if (pa_oss_set_fragments(u->fd, nfrags, frag_size) < 0)
 273         goto fail;
 274
 275     if (pa_oss_auto_format(u->fd, &u->sample_spec) < 0)
 276         goto fail;
 277
 278     if (mode != O_WRONLY) {
 279         if (ioctl(u->fd, SNDCTL_DSP_GETISPACE, &info) < 0) {
 280             fprintf(stderr, "SNDCTL_DSP_GETISPACE: %s\n", strerror(errno));
 281             goto fail;
 282         }
 283
 284         fprintf(stderr, "module-oss-mmap: input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 285         u->in_mmap_length = (u->in_fragment_size = info.fragsize) * (u->in_fragments = info.fragstotal);
 286
 287         if ((u->in_mmap = mmap(NULL, u->in_mmap_length, PROT_READ, MAP_SHARED, u->fd, 0)) == MAP_FAILED) {
 288             if (mode == O_RDWR) {
 289                 fprintf(stderr, "module-oss-mmap: mmap failed for input. Changing to O_WRONLY mode.\n");
 290                 mode = O_WRONLY;
 291             } else {
 292                 fprintf(stderr, "modeule-oss-mmap: mmap(): %s\n", strerror(errno));
 293                 goto fail;
 294             }
 295         } else {
 296
 297             u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &u->sample_spec);
 298             assert(u->source);
 299             u->source->userdata = u;
 300             pa_source_set_owner(u->source, m);
 301             u->source->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 302
 303             u->in_memblocks = pa_xmalloc0(sizeof(struct pa_memblock *)*u->in_fragments);
 304
 305             enable_bits |= PCM_ENABLE_INPUT;
 306         }
 307     }
 308
 309     if (mode != O_RDONLY) {
 310         if (ioctl(u->fd, SNDCTL_DSP_GETOSPACE, &info) < 0) {
 311             fprintf(stderr, "SNDCTL_DSP_GETOSPACE: %s\n", strerror(errno));
 312             goto fail;
 313         }
 314
 315         fprintf(stderr, "module-oss: output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 316         u->out_mmap_length = (u->out_fragment_size = info.fragsize) * (u->out_fragments = info.fragstotal);
 317
 318         if ((u->out_mmap = mmap(NULL, u->out_mmap_length, PROT_WRITE, MAP_SHARED, u->fd, 0))  == MAP_FAILED) {
 319             if (mode == O_RDWR) {
 320                 fprintf(stderr, "module-oss-mmap: mmap filed for output. Changing to O_RDONLY mode.\n");
 321                 mode = O_RDONLY;
 322             } else {
 323                 fprintf(stderr, "module-oss-mmap: mmap(): %s\n", strerror(errno));
 324                 goto fail;
 325             }
 326         } else {
 327             pa_silence_memory(u->out_mmap, u->out_mmap_length, &u->sample_spec);
 328
 329             u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &u->sample_spec);
 330             assert(u->sink);
 331             u->sink->get_latency = sink_get_latency_cb;
 332             u->sink->userdata = u;
 333             pa_sink_set_owner(u->sink, m);
 334             u->sink->description = pa_sprintf_malloc("Open Sound System PCM/mmap() on '%s'", p);
 335
 336             u->out_memblocks = pa_xmalloc0(sizeof(struct memblock *)*u->out_fragments);
 337
 338             enable_bits |= PCM_ENABLE_OUTPUT;
 339         }
 340     }
 341
 342     zero = 0;
 343     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &zero) < 0) {
 344         fprintf(stderr, "SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 345         goto fail;
 346     }
 347
 348     if (ioctl(u->fd, SNDCTL_DSP_SETTRIGGER, &enable_bits) < 0) {
 349         fprintf(stderr, "SNDCTL_DSP_SETTRIGGER: %s\n", strerror(errno));
 350         goto fail;
 351     }
 352
 353     assert(u->source || u->sink);
 354
 355     u->mainloop_source = c->mainloop->source_io(c->mainloop, u->fd, (u->source ? PA_MAINLOOP_API_IO_EVENT_INPUT : 0) | (u->sink ? PA_MAINLOOP_API_IO_EVENT_OUTPUT : 0), io_callback, u);
 356     assert(u->mainloop_source);
 357
 358     pa_modargs_free(ma);
 359
 360     return 0;
 361
 362 fail:
 363     pa_module_done(c, m);
 364
 365     if (ma)
 366         pa_modargs_free(ma);
 367
 368     return -1;
 369 }
 370
 371 void pa_module_done(struct pa_core *c, struct pa_module*m) {
 372     struct userdata *u;
 373     assert(c && m);
 374
 375     if (!(u = m->userdata))
 376         return;
 377
 378     if (u->out_memblocks) {
 379         unsigned i;
 380         for (i = 0; i < u->out_fragments; i++)
 381             if (u->out_memblocks[i])
 382                 pa_memblock_unref_fixed(u->out_memblocks[i]);
 383         pa_xfree(u->out_memblocks);
 384     }
 385
 386     if (u->in_memblocks) {
 387         unsigned i;
 388         for (i = 0; i < u->in_fragments; i++)
 389             if (u->in_memblocks[i])
 390                 pa_memblock_unref_fixed(u->in_memblocks[i]);
 391         pa_xfree(u->in_memblocks);
 392     }
 393
 394     if (u->in_mmap && u->in_mmap != MAP_FAILED)
 395         munmap(u->in_mmap, u->in_mmap_length);
 396
 397     if (u->out_mmap && u->out_mmap != MAP_FAILED)
 398         munmap(u->out_mmap, u->out_mmap_length);
 399
 400     if (u->sink)
 401         pa_sink_free(u->sink);
 402
 403     if (u->source)
 404         pa_source_free(u->source);
 405
 406     if (u->mainloop_source)
 407         u->core->mainloop->cancel_io(u->core->mainloop, u->mainloop_source);
 408
 409     if (u->fd >= 0)
 410         close(u->fd);
 411
 412     pa_xfree(u);
 413 }