code.delx.au - pulseaudio/blob - polyp/module-oss.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
  38 #include "iochannel.h"
  39 #include "sink.h"
  40 #include "source.h"
  41 #include "module.h"
  42 #include "oss-util.h"
  43 #include "sample-util.h"
  44 #include "util.h"
  45 #include "modargs.h"
  46 #include "xmalloc.h"
  47 #include "log.h"
  48
  49 struct userdata {
  50     struct pa_sink *sink;
  51     struct pa_source *source;
  52     struct pa_iochannel *io;
  53     struct pa_core *core;
  54
  55     struct pa_memchunk memchunk, silence;
  56
  57     uint32_t in_fragment_size, out_fragment_size, sample_size;
  58
  59     int fd;
  60     struct pa_module *module;
  61 };
  62
  63 static const char* const valid_modargs[] = {
  64     "sink_name",
  65     "source_name",
  66     "device",
  67     "record",
  68     "playback",
  69     "fragments",
  70     "fragment_size",
  71     "format",
  72     "rate",
  73     "channels",
  74     NULL
  75 };
  76
  77 #define DEFAULT_SINK_NAME "oss_output"
  78 #define DEFAULT_SOURCE_NAME "oss_input"
  79 #define DEFAULT_DEVICE "/dev/dsp"
  80
  81 static void update_usage(struct userdata *u) {
  82    pa_module_set_used(u->module,
  83                       (u->sink ? pa_idxset_ncontents(u->sink->inputs) : 0) +
  84                       (u->sink ? pa_idxset_ncontents(u->sink->monitor_source->outputs) : 0) +
  85                       (u->source ? pa_idxset_ncontents(u->source->outputs) : 0));
  86 }
  87
  88 static void do_write(struct userdata *u) {
  89     struct pa_memchunk *memchunk;
  90     ssize_t r;
  91     assert(u);
  92
  93     if (!u->sink || !pa_iochannel_is_writable(u->io))
  94         return;
  95
  96     update_usage(u);
  97
  98     memchunk = &u->memchunk;
  99
 100     if (!memchunk->length)
 101         if (pa_sink_render(u->sink, u->out_fragment_size, memchunk) < 0)
 102             memchunk = &u->silence;
 103
 104     assert(memchunk->memblock);
 105     assert(memchunk->memblock->data);
 106     assert(memchunk->length);
 107
 108     if ((r = pa_iochannel_write(u->io, (uint8_t*) memchunk->memblock->data + memchunk->index, memchunk->length)) < 0) {
 109         pa_log(__FILE__": write() failed: %s\n", strerror(errno));
 110         return;
 111     }
 112
 113     if (memchunk == &u->silence)
 114         assert(r % u->sample_size == 0);
 115     else {
 116         u->memchunk.index += r;
 117         u->memchunk.length -= r;
 118
 119         if (u->memchunk.length <= 0) {
 120             pa_memblock_unref(u->memchunk.memblock);
 121             u->memchunk.memblock = NULL;
 122         }
 123     }
 124 }
 125
 126 static void do_read(struct userdata *u) {
 127     struct pa_memchunk memchunk;
 128     ssize_t r;
 129     assert(u);
 130
 131     if (!u->source || !pa_iochannel_is_readable(u->io))
 132         return;
 133
 134     update_usage(u);
 135
 136     memchunk.memblock = pa_memblock_new(u->in_fragment_size, u->core->memblock_stat);
 137     assert(memchunk.memblock);
 138     if ((r = pa_iochannel_read(u->io, memchunk.memblock->data, memchunk.memblock->length)) < 0) {
 139         pa_memblock_unref(memchunk.memblock);
 140         if (errno != EAGAIN)
 141             pa_log(__FILE__": read() failed: %s\n", strerror(errno));
 142         return;
 143     }
 144
 145     assert(r <= (ssize_t) memchunk.memblock->length);
 146     memchunk.length = memchunk.memblock->length = r;
 147     memchunk.index = 0;
 148
 149     pa_source_post(u->source, &memchunk);
 150     pa_memblock_unref(memchunk.memblock);
 151 }
 152
 153 static void io_callback(struct pa_iochannel *io, void*userdata) {
 154     struct userdata *u = userdata;
 155     assert(u);
 156     do_write(u);
 157     do_read(u);
 158 }
 159
 160 static uint32_t sink_get_latency_cb(struct pa_sink *s) {
 161     int arg;
 162     struct userdata *u = s->userdata;
 163     assert(s && u && u->sink);
 164
 165     if (ioctl(u->fd, SNDCTL_DSP_GETODELAY, &arg) < 0) {
 166         pa_log(__FILE__": device doesn't support SNDCTL_DSP_GETODELAY.\n");
 167         s->get_latency = NULL;
 168         return 0;
 169     }
 170
 171     return pa_bytes_to_usec(arg, &s->sample_spec);
 172 }
 173
 174 int pa_module_init(struct pa_core *c, struct pa_module*m) {
 175     struct audio_buf_info info;
 176     struct userdata *u = NULL;
 177     const char *p;
 178     int fd = -1;
 179     int nfrags, frag_size, in_frag_size, out_frag_size;
 180     int mode;
 181     int record = 1, playback = 1;
 182     struct pa_sample_spec ss;
 183     struct pa_modargs *ma = NULL;
 184     assert(c && m);
 185
 186     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 187         pa_log(__FILE__": failed to parse module arguments.\n");
 188         goto fail;
 189     }
 190
 191     if (pa_modargs_get_value_boolean(ma, "record", &record) < 0 || pa_modargs_get_value_boolean(ma, "playback", &playback) < 0) {
 192         pa_log(__FILE__": record= and playback= expect numeric argument.\n");
 193         goto fail;
 194     }
 195
 196     if (!playback && !record) {
 197         pa_log(__FILE__": neither playback nor record enabled for device.\n");
 198         goto fail;
 199     }
 200
 201     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 202
 203     nfrags = 12;
 204     frag_size = 1024;
 205     if (pa_modargs_get_value_s32(ma, "fragments", &nfrags) < 0 || pa_modargs_get_value_s32(ma, "fragment_size", &frag_size) < 0) {
 206         pa_log(__FILE__": failed to parse fragments arguments\n");
 207         goto fail;
 208     }
 209
 210     ss = c->default_sample_spec;
 211     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 212         pa_log(__FILE__": failed to parse sample specification\n");
 213         goto fail;
 214     }
 215
 216     if ((fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, NULL)) < 0)
 217         goto fail;
 218
 219     pa_log(__FILE__": device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 220
 221
 222     if (nfrags >= 2 && frag_size >= 1)
 223         if (pa_oss_set_fragments(fd, nfrags, frag_size) < 0)
 224             goto fail;
 225
 226     if (pa_oss_auto_format(fd, &ss) < 0)
 227         goto fail;
 228
 229     if (ioctl(fd, SNDCTL_DSP_GETBLKSIZE, &frag_size) < 0) {
 230         pa_log(__FILE__": SNDCTL_DSP_GETBLKSIZE: %s\n", strerror(errno));
 231         goto fail;
 232     }
 233     assert(frag_size);
 234     in_frag_size = out_frag_size = frag_size;
 235
 236     if (ioctl(fd, SNDCTL_DSP_GETISPACE, &info) >= 0) {
 237         pa_log(__FILE__": input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 238         in_frag_size = info.fragsize;
 239     }
 240
 241     if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) >= 0) {
 242         pa_log(__FILE__": output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 243         out_frag_size = info.fragsize;
 244     }
 245
 246     u = pa_xmalloc(sizeof(struct userdata));
 247     u->core = c;
 248
 249     if (mode != O_WRONLY) {
 250         u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss);
 251         assert(u->source);
 252         u->source->userdata = u;
 253         pa_source_set_owner(u->source, m);
 254         u->source->description = pa_sprintf_malloc("Open Sound System PCM on '%s'", p);
 255     } else
 256         u->source = NULL;
 257
 258     if (mode != O_RDONLY) {
 259         u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss);
 260         assert(u->sink);
 261         u->sink->get_latency = sink_get_latency_cb;
 262         u->sink->userdata = u;
 263         pa_sink_set_owner(u->sink, m);
 264         u->sink->description = pa_sprintf_malloc("Open Sound System PCM on '%s'", p);
 265     } else
 266         u->sink = NULL;
 267
 268     assert(u->source || u->sink);
 269
 270     u->io = pa_iochannel_new(c->mainloop, u->source ? fd : -1, u->sink ? fd : 0);
 271     assert(u->io);
 272     pa_iochannel_set_callback(u->io, io_callback, u);
 273     u->fd = fd;
 274
 275     u->memchunk.memblock = NULL;
 276     u->memchunk.length = 0;
 277     u->sample_size = pa_frame_size(&ss);
 278
 279     u->out_fragment_size = out_frag_size;
 280     u->in_fragment_size = in_frag_size;
 281     u->silence.memblock = pa_memblock_new(u->silence.length = u->out_fragment_size, u->core->memblock_stat);
 282     assert(u->silence.memblock);
 283     pa_silence_memblock(u->silence.memblock, &ss);
 284     u->silence.index = 0;
 285
 286     u->module = m;
 287     m->userdata = u;
 288
 289     pa_modargs_free(ma);
 290
 291     return 0;
 292
 293 fail:
 294     if (fd >= 0)
 295         close(fd);
 296
 297     if (ma)
 298         pa_modargs_free(ma);
 299
 300     return -1;
 301 }
 302
 303 void pa_module_done(struct pa_core *c, struct pa_module*m) {
 304     struct userdata *u;
 305     assert(c && m);
 306
 307     if (!(u = m->userdata))
 308         return;
 309
 310     if (u->memchunk.memblock)
 311         pa_memblock_unref(u->memchunk.memblock);
 312     if (u->silence.memblock)
 313         pa_memblock_unref(u->silence.memblock);
 314
 315     if (u->sink)
 316         pa_sink_free(u->sink);
 317     if (u->source)
 318         pa_source_free(u->source);
 319
 320     pa_iochannel_free(u->io);
 321     pa_xfree(u);
 322 }