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
  48 struct userdata {
  49     struct pa_sink *sink;
  50     struct pa_source *source;
  51     struct pa_iochannel *io;
  52     struct pa_core *core;
  53
  54     struct pa_memchunk memchunk, silence;
  55
  56     uint32_t in_fragment_size, out_fragment_size, sample_size;
  57
  58     int fd;
  59     struct pa_module *module;
  60 };
  61
  62 static const char* const valid_modargs[] = {
  63     "sink_name",
  64     "source_name",
  65     "device",
  66     "record",
  67     "playback",
  68     "fragments",
  69     "fragment_size",
  70     "format",
  71     "rate",
  72     "channels",
  73     NULL
  74 };
  75
  76 #define DEFAULT_SINK_NAME "oss_output"
  77 #define DEFAULT_SOURCE_NAME "oss_input"
  78 #define DEFAULT_DEVICE "/dev/dsp"
  79
  80 static void update_usage(struct userdata *u) {
  81    pa_module_set_used(u->module,
  82                       (u->sink ? pa_idxset_ncontents(u->sink->inputs) : 0) +
  83                       (u->sink ? pa_idxset_ncontents(u->sink->monitor_source->outputs) : 0) +
  84                       (u->source ? pa_idxset_ncontents(u->source->outputs) : 0));
  85 }
  86
  87 static void do_write(struct userdata *u) {
  88     struct pa_memchunk *memchunk;
  89     ssize_t r;
  90     assert(u);
  91
  92     if (!u->sink || !pa_iochannel_is_writable(u->io))
  93         return;
  94
  95     update_usage(u);
  96
  97     memchunk = &u->memchunk;
  98
  99     if (!memchunk->length)
 100         if (pa_sink_render(u->sink, u->out_fragment_size, memchunk) < 0)
 101             memchunk = &u->silence;
 102
 103     assert(memchunk->memblock);
 104     assert(memchunk->memblock->data);
 105     assert(memchunk->length);
 106
 107     if ((r = pa_iochannel_write(u->io, (uint8_t*) memchunk->memblock->data + memchunk->index, memchunk->length)) < 0) {
 108         fprintf(stderr, "write() failed: %s\n", strerror(errno));
 109         return;
 110     }
 111
 112     if (memchunk == &u->silence)
 113         assert(r % u->sample_size == 0);
 114     else {
 115         u->memchunk.index += r;
 116         u->memchunk.length -= r;
 117
 118         if (u->memchunk.length <= 0) {
 119             pa_memblock_unref(u->memchunk.memblock);
 120             u->memchunk.memblock = NULL;
 121         }
 122     }
 123 }
 124
 125 static void do_read(struct userdata *u) {
 126     struct pa_memchunk memchunk;
 127     ssize_t r;
 128     assert(u);
 129
 130     if (!u->source || !pa_iochannel_is_readable(u->io))
 131         return;
 132
 133     update_usage(u);
 134
 135     memchunk.memblock = pa_memblock_new(u->in_fragment_size, u->core->memblock_stat);
 136     assert(memchunk.memblock);
 137     if ((r = pa_iochannel_read(u->io, memchunk.memblock->data, memchunk.memblock->length)) < 0) {
 138         pa_memblock_unref(memchunk.memblock);
 139         if (errno != EAGAIN)
 140             fprintf(stderr, "read() failed: %s\n", strerror(errno));
 141         return;
 142     }
 143
 144     assert(r <= (ssize_t) memchunk.memblock->length);
 145     memchunk.length = memchunk.memblock->length = r;
 146     memchunk.index = 0;
 147
 148     pa_source_post(u->source, &memchunk);
 149     pa_memblock_unref(memchunk.memblock);
 150 }
 151
 152 static void io_callback(struct pa_iochannel *io, void*userdata) {
 153     struct userdata *u = userdata;
 154     assert(u);
 155     do_write(u);
 156     do_read(u);
 157 }
 158
 159 static uint32_t sink_get_latency_cb(struct pa_sink *s) {
 160     int arg;
 161     struct userdata *u = s->userdata;
 162     assert(s && u && u->sink);
 163
 164     if (ioctl(u->fd, SNDCTL_DSP_GETODELAY, &arg) < 0) {
 165         fprintf(stderr, "module-oss: device doesn't support SNDCTL_DSP_GETODELAY.\n");
 166         s->get_latency = NULL;
 167         return 0;
 168     }
 169
 170     return pa_bytes_to_usec(arg, &s->sample_spec);
 171 }
 172
 173 int pa_module_init(struct pa_core *c, struct pa_module*m) {
 174     struct audio_buf_info info;
 175     struct userdata *u = NULL;
 176     const char *p;
 177     int fd = -1;
 178     int nfrags, frag_size, in_frag_size, out_frag_size;
 179     int mode;
 180     uint32_t record = 1, playback = 1;
 181     struct pa_sample_spec ss;
 182     struct pa_modargs *ma = NULL;
 183     assert(c && m);
 184
 185     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 186         fprintf(stderr, __FILE__": failed to parse module arguments.\n");
 187         goto fail;
 188     }
 189
 190     if (pa_modargs_get_value_u32(ma, "record", &record) < 0 || pa_modargs_get_value_u32(ma, "playback", &playback) < 0) {
 191         fprintf(stderr, __FILE__": record= and playback= expect numeric argument.\n");
 192         goto fail;
 193     }
 194
 195     mode = (playback&&record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 196     if (mode == 0) {
 197         fprintf(stderr, __FILE__": neither playback nor record enabled for device.\n");
 198         goto fail;
 199     }
 200
 201     nfrags = 12;
 202     frag_size = 1024;
 203     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) {
 204         fprintf(stderr, __FILE__": failed to parse fragments arguments\n");
 205         goto fail;
 206     }
 207
 208     ss = c->default_sample_spec;
 209     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 210         fprintf(stderr, __FILE__": failed to parse sample specification\n");
 211         goto fail;
 212     }
 213
 214     if ((fd = pa_oss_open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), &mode, NULL)) < 0)
 215         goto fail;
 216
 217     fprintf(stderr, "module-oss: device opened in %s mode.\n", mode == O_WRONLY ? "O_WRONLY" : (mode == O_RDONLY ? "O_RDONLY" : "O_RDWR"));
 218
 219     if (pa_oss_set_fragments(fd, nfrags, frag_size) < 0)
 220         goto fail;
 221
 222     if (pa_oss_auto_format(fd, &ss) < 0)
 223         goto fail;
 224
 225     if (ioctl(fd, SNDCTL_DSP_GETBLKSIZE, &frag_size) < 0) {
 226         fprintf(stderr, "SNDCTL_DSP_GETBLKSIZE: %s\n", strerror(errno));
 227         goto fail;
 228     }
 229     assert(frag_size);
 230     in_frag_size = out_frag_size = frag_size;
 231
 232     if (ioctl(fd, SNDCTL_DSP_GETISPACE, &info) >= 0) {
 233         fprintf(stderr, "module-oss: input -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 234         in_frag_size = info.fragsize;
 235     }
 236
 237     if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) >= 0) {
 238         fprintf(stderr, "module-oss: output -- %u fragments of size %u.\n", info.fragstotal, info.fragsize);
 239         out_frag_size = info.fragsize;
 240     }
 241
 242     u = pa_xmalloc(sizeof(struct userdata));
 243     u->core = c;
 244
 245     if (mode != O_WRONLY) {
 246         u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss);
 247         assert(u->source);
 248         u->source->userdata = u;
 249         pa_source_set_owner(u->source, m);
 250         u->source->description = pa_sprintf_malloc("Open Sound System PCM on '%s'", p);
 251     } else
 252         u->source = NULL;
 253
 254     if (mode != O_RDONLY) {
 255         u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss);
 256         assert(u->sink);
 257         u->sink->get_latency = sink_get_latency_cb;
 258         u->sink->userdata = u;
 259         pa_sink_set_owner(u->sink, m);
 260         u->sink->description = pa_sprintf_malloc("Open Sound System PCM on '%s'", p);
 261     } else
 262         u->sink = NULL;
 263
 264     assert(u->source || u->sink);
 265
 266     u->io = pa_iochannel_new(c->mainloop, u->source ? fd : -1, u->sink ? fd : 0);
 267     assert(u->io);
 268     pa_iochannel_set_callback(u->io, io_callback, u);
 269     u->fd = fd;
 270
 271     u->memchunk.memblock = NULL;
 272     u->memchunk.length = 0;
 273     u->sample_size = pa_frame_size(&ss);
 274
 275     u->out_fragment_size = out_frag_size;
 276     u->in_fragment_size = in_frag_size;
 277     u->silence.memblock = pa_memblock_new(u->silence.length = u->out_fragment_size, u->core->memblock_stat);
 278     assert(u->silence.memblock);
 279     pa_silence_memblock(u->silence.memblock, &ss);
 280     u->silence.index = 0;
 281
 282     u->module = m;
 283     m->userdata = u;
 284
 285     pa_modargs_free(ma);
 286
 287     return 0;
 288
 289 fail:
 290     if (fd >= 0)
 291         close(fd);
 292
 293     if (ma)
 294         pa_modargs_free(ma);
 295
 296     return -1;
 297 }
 298
 299 void pa_module_done(struct pa_core *c, struct pa_module*m) {
 300     struct userdata *u;
 301     assert(c && m);
 302
 303     if (!(u = m->userdata))
 304         return;
 305
 306     if (u->memchunk.memblock)
 307         pa_memblock_unref(u->memchunk.memblock);
 308     if (u->silence.memblock)
 309         pa_memblock_unref(u->silence.memblock);
 310
 311     if (u->sink)
 312         pa_sink_free(u->sink);
 313     if (u->source)
 314         pa_source_free(u->source);
 315
 316     pa_iochannel_free(u->io);
 317     pa_xfree(u);
 318 }