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