code.delx.au - pulseaudio/blob - src/modules/module-alsa-source.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 Lesser 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 Lesser 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 <assert.h>
  27 #include <stdio.h>
  28
  29 #ifdef HAVE_SYS_POLL_H
  30 #include <sys/poll.h>
  31 #else
  32 #include "poll.h"
  33 #endif
  34
  35 #include <asoundlib.h>
  36
  37 #include <polypcore/core.h>
  38 #include <polypcore/module.h>
  39 #include <polypcore/memchunk.h>
  40 #include <polypcore/sink.h>
  41 #include <polypcore/modargs.h>
  42 #include <polypcore/util.h>
  43 #include <polypcore/sample-util.h>
  44 #include <polypcore/xmalloc.h>
  45 #include <polypcore/log.h>
  46
  47 #include "alsa-util.h"
  48 #include "module-alsa-source-symdef.h"
  49
  50 PA_MODULE_AUTHOR("Lennart Poettering")
  51 PA_MODULE_DESCRIPTION("ALSA Source")
  52 PA_MODULE_VERSION(PACKAGE_VERSION)
  53 PA_MODULE_USAGE("source_name=<name for the source> device=<ALSA device> format=<sample format> channels=<number of channels> rate=<sample rate> fragments=<number of fragments> fragment_size=<fragment size>")
  54
  55 struct userdata {
  56     snd_pcm_t *pcm_handle;
  57     snd_mixer_t *mixer_handle;
  58     snd_mixer_elem_t *mixer_elem;
  59     pa_source *source;
  60     pa_io_event **io_events;
  61     unsigned n_io_events;
  62     long hw_volume_max, hw_volume_min;
  63
  64     size_t frame_size, fragment_size;
  65     pa_memchunk memchunk;
  66     pa_module *module;
  67 };
  68
  69 static const char* const valid_modargs[] = {
  70     "device",
  71     "source_name",
  72     "channels",
  73     "rate",
  74     "format",
  75     "fragments",
  76     "fragment_size",
  77     NULL
  78 };
  79
  80 #define DEFAULT_SOURCE_NAME "alsa_input"
  81 #define DEFAULT_DEVICE "default"
  82
  83 static void update_usage(struct userdata *u) {
  84    pa_module_set_used(u->module,
  85                       (u->source ? pa_idxset_size(u->source->outputs) : 0));
  86 }
  87
  88 static void xrun_recovery(struct userdata *u) {
  89     assert(u);
  90
  91     pa_log(__FILE__": *** ALSA-XRUN (capture) ***");
  92
  93     if (snd_pcm_prepare(u->pcm_handle) < 0)
  94         pa_log(__FILE__": snd_pcm_prepare() failed");
  95 }
  96
  97 static void do_read(struct userdata *u) {
  98     assert(u);
  99
 100     update_usage(u);
 101
 102     for (;;) {
 103         pa_memchunk post_memchunk;
 104         snd_pcm_sframes_t frames;
 105         size_t l;
 106
 107         if (!u->memchunk.memblock) {
 108             u->memchunk.memblock = pa_memblock_new(u->memchunk.length = u->fragment_size, u->source->core->memblock_stat);
 109             u->memchunk.index = 0;
 110         }
 111
 112         assert(u->memchunk.memblock && u->memchunk.memblock->data && u->memchunk.length && u->memchunk.memblock->length && (u->memchunk.length % u->frame_size) == 0);
 113
 114         if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
 115             if (frames == -EAGAIN)
 116                 return;
 117
 118             if (frames == -EPIPE) {
 119                 xrun_recovery(u);
 120                 continue;
 121             }
 122
 123             pa_log(__FILE__": snd_pcm_readi() failed: %s", strerror(-frames));
 124             return;
 125         }
 126
 127         l = frames * u->frame_size;
 128
 129         post_memchunk = u->memchunk;
 130         post_memchunk.length = l;
 131
 132         pa_source_post(u->source, &post_memchunk);
 133
 134         u->memchunk.index += l;
 135         u->memchunk.length -= l;
 136
 137         if (u->memchunk.length == 0) {
 138             pa_memblock_unref(u->memchunk.memblock);
 139             u->memchunk.memblock = NULL;
 140             u->memchunk.index = u->memchunk.length = 0;
 141         }
 142
 143         break;
 144     }
 145 }
 146
 147 static void io_callback(pa_mainloop_api*a, pa_io_event *e, PA_GCC_UNUSED int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) {
 148     struct userdata *u = userdata;
 149     assert(u && a && e);
 150
 151     if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
 152         xrun_recovery(u);
 153
 154     do_read(u);
 155 }
 156
 157 static pa_usec_t source_get_latency_cb(pa_source *s) {
 158     struct userdata *u = s->userdata;
 159     snd_pcm_sframes_t frames;
 160     assert(s && u && u->source);
 161
 162     if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
 163         pa_log(__FILE__": failed to get delay");
 164         s->get_latency = NULL;
 165         return 0;
 166     }
 167
 168     return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 169 }
 170
 171 static int source_get_hw_volume_cb(pa_source *s) {
 172     struct userdata *u = s->userdata;
 173     long vol;
 174     int err;
 175
 176     assert(u && u->mixer_elem);
 177
 178     if (snd_mixer_selem_has_capture_volume_joined(u->mixer_elem)) {
 179         err = snd_mixer_selem_get_capture_volume(u->mixer_elem, 0, &vol);
 180         if (err < 0)
 181             goto fail;
 182         pa_cvolume_set(&s->hw_volume, s->hw_volume.channels,
 183             (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min));
 184     } else {
 185         int i;
 186
 187         for (i = 0;i < s->hw_volume.channels;i++) {
 188             err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol);
 189             if (err < 0)
 190                 goto fail;
 191             s->hw_volume.values[i] =
 192                 (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
 193         }
 194     }
 195
 196     return 0;
 197
 198 fail:
 199     pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
 200     s->get_hw_volume = NULL;
 201     s->set_hw_volume = NULL;
 202     return -1;
 203 }
 204
 205 static int source_set_hw_volume_cb(pa_source *s) {
 206     struct userdata *u = s->userdata;
 207     int err;
 208     pa_volume_t vol;
 209
 210     assert(u && u->mixer_elem);
 211
 212     if (snd_mixer_selem_has_capture_volume_joined(u->mixer_elem)) {
 213         vol = pa_cvolume_avg(&s->hw_volume) * (u->hw_volume_max - u->hw_volume_min) /
 214             PA_VOLUME_NORM + u->hw_volume_min;
 215         err = snd_mixer_selem_set_capture_volume_all(u->mixer_elem, vol);
 216         if (err < 0)
 217             goto fail;
 218     } else {
 219         int i;
 220
 221         for (i = 0;i < s->hw_volume.channels;i++) {
 222             vol = s->hw_volume.values[i] * (u->hw_volume_max - u->hw_volume_min) /
 223                 PA_VOLUME_NORM + u->hw_volume_min;
 224             err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol);
 225             if (err < 0)
 226                 goto fail;
 227         }
 228     }
 229
 230     return 0;
 231
 232 fail:
 233     pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
 234     s->get_hw_volume = NULL;
 235     s->set_hw_volume = NULL;
 236     return -1;
 237 }
 238
 239 static int source_get_hw_mute_cb(pa_source *s) {
 240     struct userdata *u = s->userdata;
 241     int err, sw;
 242
 243     assert(u && u->mixer_elem);
 244
 245     err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
 246     if (err) {
 247         pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
 248         s->get_hw_mute = NULL;
 249         s->set_hw_mute = NULL;
 250         return -1;
 251     }
 252
 253     s->hw_muted = !sw;
 254
 255     return 0;
 256 }
 257
 258 static int source_set_hw_mute_cb(pa_source *s) {
 259     struct userdata *u = s->userdata;
 260     int err;
 261
 262     assert(u && u->mixer_elem);
 263
 264     err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
 265     if (err) {
 266         pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
 267         s->get_hw_mute = NULL;
 268         s->set_hw_mute = NULL;
 269         return -1;
 270     }
 271
 272     return 0;
 273 }
 274
 275 int pa__init(pa_core *c, pa_module*m) {
 276     pa_modargs *ma = NULL;
 277     int ret = -1;
 278     struct userdata *u = NULL;
 279     const char *dev;
 280     pa_sample_spec ss;
 281     unsigned periods, fragsize;
 282     snd_pcm_uframes_t period_size;
 283     size_t frame_size;
 284     int err;
 285
 286     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 287         pa_log(__FILE__": failed to parse module arguments");
 288         goto fail;
 289     }
 290
 291     ss = c->default_sample_spec;
 292     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 293         pa_log(__FILE__": failed to parse sample specification");
 294         goto fail;
 295     }
 296     frame_size = pa_frame_size(&ss);
 297
 298     periods = 12;
 299     fragsize = 1024;
 300     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 301         pa_log(__FILE__": failed to parse buffer metrics");
 302         goto fail;
 303     }
 304     period_size = fragsize;
 305
 306     u = pa_xmalloc0(sizeof(struct userdata));
 307     m->userdata = u;
 308     u->module = m;
 309
 310     snd_config_update_free_global();
 311     if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
 312         pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
 313         goto fail;
 314     }
 315
 316     if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
 317         pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
 318         goto fail;
 319     }
 320
 321     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
 322         pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
 323         goto fail;
 324     }
 325
 326     if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
 327         !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture"))) {
 328         snd_mixer_close(u->mixer_handle);
 329         u->mixer_handle = NULL;
 330     }
 331
 332     u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL);
 333     assert(u->source);
 334
 335     u->source->userdata = u;
 336     u->source->get_latency = source_get_latency_cb;
 337     if (u->mixer_handle) {
 338         assert(u->mixer_elem);
 339         if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
 340             u->source->get_hw_volume = source_get_hw_volume_cb;
 341             u->source->set_hw_volume = source_set_hw_volume_cb;
 342             snd_mixer_selem_get_capture_volume_range(
 343                 u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
 344         }
 345         if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
 346             u->source->get_hw_mute = source_get_hw_mute_cb;
 347             u->source->set_hw_mute = source_set_hw_mute_cb;
 348         }
 349     }
 350     pa_source_set_owner(u->source, m);
 351     u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
 352
 353     if (pa_create_io_events(u->pcm_handle, c->mainloop, &u->io_events, &u->n_io_events, io_callback, u) < 0) {
 354         pa_log(__FILE__": failed to obtain file descriptors");
 355         goto fail;
 356     }
 357
 358     u->frame_size = frame_size;
 359     u->fragment_size = period_size;
 360
 361     pa_log(__FILE__": using %u fragments of size %u bytes.", periods, u->fragment_size);
 362
 363     u->memchunk.memblock = NULL;
 364     u->memchunk.index = u->memchunk.length = 0;
 365
 366     snd_pcm_start(u->pcm_handle);
 367
 368     ret = 0;
 369
 370 finish:
 371      if (ma)
 372          pa_modargs_free(ma);
 373
 374     /* Get initial mixer settings */
 375     if (u->source->get_hw_volume)
 376         u->source->get_hw_volume(u->source);
 377     if (u->source->get_hw_mute)
 378         u->source->get_hw_mute(u->source);
 379
 380     return ret;
 381
 382 fail:
 383
 384     if (u)
 385         pa__done(c, m);
 386
 387     goto finish;
 388 }
 389
 390 void pa__done(pa_core *c, pa_module*m) {
 391     struct userdata *u;
 392     assert(c && m);
 393
 394     if (!(u = m->userdata))
 395         return;
 396
 397     if (u->source) {
 398         pa_source_disconnect(u->source);
 399         pa_source_unref(u->source);
 400     }
 401
 402     if (u->io_events)
 403         pa_free_io_events(c->mainloop, u->io_events, u->n_io_events);
 404
 405     if (u->mixer_handle)
 406         snd_mixer_close(u->mixer_handle);
 407
 408     if (u->pcm_handle) {
 409         snd_pcm_drop(u->pcm_handle);
 410         snd_pcm_close(u->pcm_handle);
 411     }
 412
 413     if (u->memchunk.memblock)
 414         pa_memblock_unref(u->memchunk.memblock);
 415
 416     pa_xfree(u);
 417 }
 418