code.delx.au - pulseaudio/blob - polyp/module-alsa-sink.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 <assert.h>
  27 #include <stdio.h>
  28 #include <sys/poll.h>
  29
  30 #include <asoundlib.h>
  31
  32 #include "module.h"
  33 #include "core.h"
  34 #include "memchunk.h"
  35 #include "sink.h"
  36 #include "modargs.h"
  37 #include "util.h"
  38 #include "sample-util.h"
  39 #include "alsa-util.h"
  40 #include "xmalloc.h"
  41 #include "log.h"
  42
  43 PA_MODULE_AUTHOR("Lennart Poettering")
  44 PA_MODULE_DESCRIPTION("ALSA Sink")
  45 PA_MODULE_VERSION(PACKAGE_VERSION)
  46
  47 struct userdata {
  48     snd_pcm_t *pcm_handle;
  49     struct pa_sink *sink;
  50     struct pa_io_event **io_events;
  51     unsigned n_io_events;
  52
  53     size_t frame_size, fragment_size;
  54     struct pa_memchunk memchunk, silence;
  55     struct pa_module *module;
  56 };
  57
  58 static const char* const valid_modargs[] = {
  59     "device",
  60     "sink_name",
  61     "format",
  62     "channels",
  63     "rate",
  64     "fragments",
  65     "fragment_size",
  66     NULL
  67 };
  68
  69 #define DEFAULT_SINK_NAME "alsa_output"
  70 #define DEFAULT_DEVICE "plughw:0,0"
  71
  72 static void update_usage(struct userdata *u) {
  73    pa_module_set_used(u->module,
  74                       (u->sink ? pa_idxset_ncontents(u->sink->inputs) : 0) +
  75                       (u->sink ? pa_idxset_ncontents(u->sink->monitor_source->outputs) : 0));
  76 }
  77
  78 static void xrun_recovery(struct userdata *u) {
  79     assert(u);
  80
  81     pa_log(__FILE__": *** ALSA-XRUN (playback) ***\n");
  82
  83     if (snd_pcm_prepare(u->pcm_handle) < 0)
  84         pa_log(__FILE__": snd_pcm_prepare() failed\n");
  85 }
  86
  87 static void do_write(struct userdata *u) {
  88     assert(u);
  89
  90     update_usage(u);
  91
  92     for (;;) {
  93         struct pa_memchunk *memchunk = NULL;
  94         snd_pcm_sframes_t frames;
  95
  96         if (u->memchunk.memblock)
  97             memchunk = &u->memchunk;
  98         else {
  99             if (pa_sink_render(u->sink, u->fragment_size, &u->memchunk) < 0)
 100                 memchunk = &u->silence;
 101             else
 102                 memchunk = &u->memchunk;
 103         }
 104
 105         assert(memchunk->memblock && memchunk->memblock->data && memchunk->length && memchunk->memblock->length && (memchunk->length % u->frame_size) == 0);
 106
 107         if ((frames = snd_pcm_writei(u->pcm_handle, (uint8_t*) memchunk->memblock->data + memchunk->index, memchunk->length / u->frame_size)) < 0) {
 108             if (frames == -EAGAIN)
 109                 return;
 110
 111             if (frames == -EPIPE) {
 112                 xrun_recovery(u);
 113                 continue;
 114             }
 115
 116             pa_log(__FILE__": snd_pcm_writei() failed\n");
 117             return;
 118         }
 119
 120         if (memchunk == &u->memchunk) {
 121             size_t l = frames * u->frame_size;
 122             memchunk->index += l;
 123             memchunk->length -= l;
 124
 125             if (memchunk->length == 0) {
 126                 pa_memblock_unref(memchunk->memblock);
 127                 memchunk->memblock = NULL;
 128                 memchunk->index = memchunk->length = 0;
 129             }
 130         }
 131
 132         break;
 133     }
 134 }
 135
 136 static void io_callback(struct pa_mainloop_api*a, struct pa_io_event *e, int fd, enum pa_io_event_flags f, void *userdata) {
 137     struct userdata *u = userdata;
 138     assert(u && a && e);
 139
 140     if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
 141         xrun_recovery(u);
 142
 143     do_write(u);
 144 }
 145
 146 static pa_usec_t sink_get_latency_cb(struct pa_sink *s) {
 147     pa_usec_t r = 0;
 148     struct userdata *u = s->userdata;
 149     snd_pcm_sframes_t frames;
 150     assert(s && u && u->sink);
 151
 152     if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
 153         pa_log(__FILE__": failed to get delay\n");
 154         s->get_latency = NULL;
 155         return 0;
 156     }
 157
 158     if (frames < 0)
 159         frames = 0;
 160
 161     r += pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
 162
 163     if (u->memchunk.memblock)
 164         r += pa_bytes_to_usec(u->memchunk.length, &s->sample_spec);
 165
 166     return r;
 167 }
 168
 169 int pa__init(struct pa_core *c, struct pa_module*m) {
 170     struct pa_modargs *ma = NULL;
 171     int ret = -1;
 172     struct userdata *u = NULL;
 173     const char *dev;
 174     struct pa_sample_spec ss;
 175     unsigned periods, fragsize;
 176     snd_pcm_uframes_t buffer_size;
 177     size_t frame_size;
 178
 179     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 180         pa_log(__FILE__": failed to parse module arguments\n");
 181         goto fail;
 182     }
 183
 184     ss = c->default_sample_spec;
 185     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 186         pa_log(__FILE__": failed to parse sample specification\n");
 187         goto fail;
 188     }
 189     frame_size = pa_frame_size(&ss);
 190
 191     periods = 12;
 192     fragsize = 1024;
 193     if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
 194         pa_log(__FILE__": failed to parse buffer metrics\n");
 195         goto fail;
 196     }
 197     buffer_size = fragsize/frame_size*periods;
 198
 199     u = pa_xmalloc0(sizeof(struct userdata));
 200     m->userdata = u;
 201     u->module = m;
 202
 203     if (snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) {
 204         pa_log(__FILE__": Error opening PCM device %s\n", dev);
 205         goto fail;
 206     }
 207
 208     if (pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &buffer_size) < 0) {
 209         pa_log(__FILE__": Failed to set hardware parameters\n");
 210         goto fail;
 211     }
 212
 213     u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss);
 214     assert(u->sink);
 215
 216     u->sink->get_latency = sink_get_latency_cb;
 217     u->sink->userdata = u;
 218     pa_sink_set_owner(u->sink, m);
 219     u->sink->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
 220
 221     if (pa_create_io_events(u->pcm_handle, c->mainloop, &u->io_events, &u->n_io_events, io_callback, u) < 0) {
 222         pa_log(__FILE__": failed to obtain file descriptors\n");
 223         goto fail;
 224     }
 225
 226     u->frame_size = frame_size;
 227     u->fragment_size = buffer_size*u->frame_size/periods;
 228
 229     pa_log(__FILE__": using %u fragments of size %u bytes.\n", periods, u->fragment_size);
 230
 231     u->silence.memblock = pa_memblock_new(u->silence.length = u->fragment_size, c->memblock_stat);
 232     assert(u->silence.memblock);
 233     pa_silence_memblock(u->silence.memblock, &ss);
 234     u->silence.index = 0;
 235
 236     u->memchunk.memblock = NULL;
 237     u->memchunk.index = u->memchunk.length = 0;
 238
 239     ret = 0;
 240
 241 finish:
 242      if (ma)
 243          pa_modargs_free(ma);
 244
 245     return ret;
 246
 247 fail:
 248
 249     if (u)
 250         pa__done(c, m);
 251
 252     goto finish;
 253 }
 254
 255 void pa__done(struct pa_core *c, struct pa_module*m) {
 256     struct userdata *u;
 257     assert(c && m);
 258
 259     if (!(u = m->userdata))
 260         return;
 261
 262     if (u->sink) {
 263         pa_sink_disconnect(u->sink);
 264         pa_sink_unref(u->sink);
 265     }
 266
 267     if (u->io_events)
 268         pa_free_io_events(c->mainloop, u->io_events, u->n_io_events);
 269
 270     if (u->pcm_handle) {
 271         snd_pcm_drop(u->pcm_handle);
 272         snd_pcm_close(u->pcm_handle);
 273     }
 274
 275     if (u->memchunk.memblock)
 276         pa_memblock_unref(u->memchunk.memblock);
 277     if (u->silence.memblock)
 278         pa_memblock_unref(u->silence.memblock);
 279
 280     pa_xfree(u);
 281 }
 282