src/modules/module-jack-sink.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Lennart Poettering
   5
   6   PulseAudio 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   PulseAudio 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 PulseAudio; 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 <stdlib.h>
  27 #include <sys/stat.h>
  28 #include <stdio.h>
  29 #include <errno.h>
  30 #include <string.h>
  31 #include <fcntl.h>
  32 #include <unistd.h>
  33 #include <limits.h>
  34
  35 #include <jack/jack.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/sink.h>
  41 #include <pulsecore/module.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/modargs.h>
  44 #include <pulsecore/log.h>
  45 #include <pulsecore/thread.h>
  46 #include <pulsecore/thread-mq.h>
  47 #include <pulsecore/rtpoll.h>
  48 #include <pulsecore/sample-util.h>
  49
  50 #include "module-jack-sink-symdef.h"
  51
  52 /* General overview:
  53  *
  54  * Because JACK has a very unflexible event loop management which
  55  * doesn't allow us to add our own event sources to the event thread
  56  * we cannot use the JACK real-time thread for dispatching our PA
  57  * work. Instead, we run an additional RT thread which does most of
  58  * the PA handling, and have the JACK RT thread request data from it
  59  * via pa_asyncmsgq. The cost is an additional context switch which
  60  * should hopefully not be that expensive if RT scheduling is
  61  * enabled. A better fix would only be possible with additional event
  62  * source support in JACK.
  63  */
  64
  65 PA_MODULE_AUTHOR("Lennart Poettering");
  66 PA_MODULE_DESCRIPTION("JACK Sink");
  67 PA_MODULE_LOAD_ONCE(TRUE);
  68 PA_MODULE_VERSION(PACKAGE_VERSION);
  69 PA_MODULE_USAGE(
  70         "sink_name=<name of sink> "
  71         "server_name=<jack server name> "
  72         "client_name=<jack client name> "
  73         "channels=<number of channels> "
  74         "connect=<connect ports?> "
  75         "channel_map=<channel map>");
  76
  77 #define DEFAULT_SINK_NAME "jack_out"
  78
  79 struct userdata {
  80     pa_core *core;
  81     pa_module *module;
  82     pa_sink *sink;
  83
  84     unsigned channels;
  85
  86     jack_port_t* port[PA_CHANNELS_MAX];
  87     jack_client_t *client;
  88
  89     void *buffer[PA_CHANNELS_MAX];
  90
  91     pa_thread_mq thread_mq;
  92     pa_asyncmsgq *jack_msgq;
  93     pa_rtpoll *rtpoll;
  94     pa_rtpoll_item *rtpoll_item;
  95
  96     pa_thread *thread;
  97
  98     jack_nframes_t frames_in_buffer;
  99     jack_nframes_t saved_frame_time;
 100     pa_bool_t saved_frame_time_valid;
 101 };
 102
 103 static const char* const valid_modargs[] = {
 104     "sink_name",
 105     "server_name",
 106     "client_name",
 107     "channels",
 108     "connect",
 109     "channel_map",
 110     NULL
 111 };
 112
 113 enum {
 114     SINK_MESSAGE_RENDER = PA_SINK_MESSAGE_MAX,
 115     SINK_MESSAGE_ON_SHUTDOWN
 116 };
 117
 118 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *memchunk) {
 119     struct userdata *u = PA_SINK(o)->userdata;
 120
 121     switch (code) {
 122
 123         case SINK_MESSAGE_RENDER:
 124
 125             /* Handle the request from the JACK thread */
 126
 127             if (u->sink->thread_info.state == PA_SINK_RUNNING) {
 128                 pa_memchunk chunk;
 129                 size_t nbytes;
 130                 void *p;
 131
 132                 pa_assert(offset > 0);
 133                 nbytes = (size_t) offset * pa_frame_size(&u->sink->sample_spec);
 134
 135                 pa_sink_render_full(u->sink, nbytes, &chunk);
 136
 137                 p = (uint8_t*) pa_memblock_acquire(chunk.memblock) + chunk.index;
 138                 pa_deinterleave(p, u->buffer, u->channels, sizeof(float), (unsigned) offset);
 139                 pa_memblock_release(chunk.memblock);
 140
 141                 pa_memblock_unref(chunk.memblock);
 142             } else {
 143                 unsigned c;
 144                 pa_sample_spec ss;
 145
 146                 /* Humm, we're not RUNNING, hence let's write some silence */
 147
 148                 ss = u->sink->sample_spec;
 149                 ss.channels = 1;
 150
 151                 for (c = 0; c < u->channels; c++)
 152                     pa_silence_memory(u->buffer[c], (size_t) offset * pa_sample_size(&ss), &ss);
 153             }
 154
 155             u->frames_in_buffer = (jack_nframes_t) offset;
 156             u->saved_frame_time = * (jack_nframes_t*) data;
 157             u->saved_frame_time_valid = TRUE;
 158
 159             return 0;
 160
 161         case SINK_MESSAGE_ON_SHUTDOWN:
 162             pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 163             return 0;
 164
 165         case PA_SINK_MESSAGE_GET_LATENCY: {
 166             jack_nframes_t l, ft, d;
 167             size_t n;
 168
 169             /* This is the "worst-case" latency */
 170             l = jack_port_get_total_latency(u->client, u->port[0]) + u->frames_in_buffer;
 171
 172             if (u->saved_frame_time_valid) {
 173                 /* Adjust the worst case latency by the time that
 174                  * passed since we last handed data to JACK */
 175
 176                 ft = jack_frame_time(u->client);
 177                 d = ft > u->saved_frame_time ? ft - u->saved_frame_time : 0;
 178                 l = l > d ? l - d : 0;
 179             }
 180
 181             /* Convert it to usec */
 182             n = l * pa_frame_size(&u->sink->sample_spec);
 183             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->sink->sample_spec);
 184
 185             return 0;
 186         }
 187     }
 188
 189     return pa_sink_process_msg(o, code, data, offset, memchunk);
 190 }
 191
 192 static int jack_process(jack_nframes_t nframes, void *arg) {
 193     struct userdata *u = arg;
 194     unsigned c;
 195     jack_nframes_t frame_time;
 196     pa_assert(u);
 197
 198     /* We just forward the request to our other RT thread */
 199
 200     for (c = 0; c < u->channels; c++)
 201         pa_assert_se(u->buffer[c] = jack_port_get_buffer(u->port[c], nframes));
 202
 203     frame_time = jack_frame_time(u->client);
 204
 205     pa_assert_se(pa_asyncmsgq_send(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_RENDER, &frame_time, nframes, NULL) == 0);
 206     return 0;
 207 }
 208
 209 static void thread_func(void *userdata) {
 210     struct userdata *u = userdata;
 211
 212     pa_assert(u);
 213
 214     pa_log_debug("Thread starting up");
 215
 216     if (u->core->realtime_scheduling)
 217         pa_make_realtime(u->core->realtime_priority);
 218
 219     pa_thread_mq_install(&u->thread_mq);
 220     pa_rtpoll_install(u->rtpoll);
 221
 222     for (;;) {
 223         int ret;
 224
 225         if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
 226             if (u->sink->thread_info.rewind_requested)
 227                 pa_sink_process_rewind(u->sink, 0);
 228
 229         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 230             goto fail;
 231
 232         if (ret == 0)
 233             goto finish;
 234     }
 235
 236 fail:
 237     /* If this was no regular exit from the loop we have to continue
 238      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 239     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 240     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 241
 242 finish:
 243     pa_log_debug("Thread shutting down");
 244 }
 245
 246 static void jack_error_func(const char*t) {
 247     char *s;
 248
 249     s = pa_xstrndup(t, strcspn(t, "\n\r"));
 250     pa_log_warn("JACK error >%s<", s);
 251     pa_xfree(s);
 252 }
 253
 254 static void jack_init(void *arg) {
 255     struct userdata *u = arg;
 256
 257     pa_log_info("JACK thread starting up.");
 258
 259     if (u->core->realtime_scheduling)
 260         pa_make_realtime(u->core->realtime_priority+4);
 261 }
 262
 263 static void jack_shutdown(void* arg) {
 264     struct userdata *u = arg;
 265
 266     pa_log_info("JACK thread shutting down..");
 267     pa_asyncmsgq_post(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_ON_SHUTDOWN, NULL, 0, NULL, NULL);
 268 }
 269
 270 int pa__init(pa_module*m) {
 271     struct userdata *u = NULL;
 272     pa_sample_spec ss;
 273     pa_channel_map map;
 274     pa_modargs *ma = NULL;
 275     jack_status_t status;
 276     const char *server_name, *client_name;
 277     uint32_t channels = 0;
 278     pa_bool_t do_connect = TRUE;
 279     unsigned i;
 280     const char **ports = NULL, **p;
 281     pa_sink_new_data data;
 282
 283     pa_assert(m);
 284
 285     jack_set_error_function(jack_error_func);
 286
 287     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 288         pa_log("Failed to parse module arguments.");
 289         goto fail;
 290     }
 291
 292     if (pa_modargs_get_value_boolean(ma, "connect", &do_connect) < 0) {
 293         pa_log("Failed to parse connect= argument.");
 294         goto fail;
 295     }
 296
 297     server_name = pa_modargs_get_value(ma, "server_name", NULL);
 298     client_name = pa_modargs_get_value(ma, "client_name", "PulseAudio JACK Sink");
 299
 300     u = pa_xnew0(struct userdata, 1);
 301     u->core = m->core;
 302     u->module = m;
 303     m->userdata = u;
 304     u->saved_frame_time_valid = FALSE;
 305     u->rtpoll = pa_rtpoll_new();
 306     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 307
 308     /* The queue linking the JACK thread and our RT thread */
 309     u->jack_msgq = pa_asyncmsgq_new(0);
 310
 311     /* The msgq from the JACK RT thread should have an even higher
 312      * priority than the normal message queues, to match the guarantee
 313      * all other drivers make: supplying the audio device with data is
 314      * the top priority -- and as long as that is possible we don't do
 315      * anything else */
 316     u->rtpoll_item = pa_rtpoll_item_new_asyncmsgq_read(u->rtpoll, PA_RTPOLL_EARLY-1, u->jack_msgq);
 317
 318     if (!(u->client = jack_client_open(client_name, server_name ? JackServerName : JackNullOption, &status, server_name))) {
 319         pa_log("jack_client_open() failed.");
 320         goto fail;
 321     }
 322
 323     ports = jack_get_ports(u->client, NULL, NULL, JackPortIsPhysical|JackPortIsInput);
 324
 325     channels = 0;
 326     for (p = ports; *p; p++)
 327         channels++;
 328
 329     if (!channels)
 330         channels = m->core->default_sample_spec.channels;
 331
 332     if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 || channels <= 0 || channels >= PA_CHANNELS_MAX) {
 333         pa_log("Failed to parse channels= argument.");
 334         goto fail;
 335     }
 336
 337     pa_channel_map_init_extend(&map, channels, PA_CHANNEL_MAP_ALSA);
 338     if (pa_modargs_get_channel_map(ma, NULL, &map) < 0 || map.channels != channels) {
 339         pa_log("Failed to parse channel_map= argument.");
 340         goto fail;
 341     }
 342
 343     pa_log_info("Successfully connected as '%s'", jack_get_client_name(u->client));
 344
 345     u->channels = ss.channels = (uint8_t) channels;
 346     ss.rate = jack_get_sample_rate(u->client);
 347     ss.format = PA_SAMPLE_FLOAT32NE;
 348
 349     pa_assert(pa_sample_spec_valid(&ss));
 350
 351     for (i = 0; i < ss.channels; i++) {
 352         if (!(u->port[i] = jack_port_register(u->client, pa_channel_position_to_string(map.map[i]), JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput|JackPortIsTerminal, 0))) {
 353             pa_log("jack_port_register() failed.");
 354             goto fail;
 355         }
 356     }
 357
 358     pa_sink_new_data_init(&data);
 359     data.driver = __FILE__;
 360     data.module = m;
 361     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 362     pa_sink_new_data_set_sample_spec(&data, &ss);
 363     pa_sink_new_data_set_channel_map(&data, &map);
 364     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "jack");
 365     if (server_name)
 366         pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, server_name);
 367     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Jack sink (%s)", jack_get_client_name(u->client));
 368     pa_proplist_sets(data.proplist, "jack.client_name", jack_get_client_name(u->client));
 369
 370     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
 371     pa_sink_new_data_done(&data);
 372
 373     if (!u->sink) {
 374         pa_log("Failed to create sink.");
 375         goto fail;
 376     }
 377
 378     u->sink->parent.process_msg = sink_process_msg;
 379     u->sink->userdata = u;
 380
 381     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 382     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 383
 384     jack_set_process_callback(u->client, jack_process, u);
 385     jack_on_shutdown(u->client, jack_shutdown, u);
 386     jack_set_thread_init_callback(u->client, jack_init, u);
 387
 388     if (!(u->thread = pa_thread_new(thread_func, u))) {
 389         pa_log("Failed to create thread.");
 390         goto fail;
 391     }
 392
 393     if (jack_activate(u->client)) {
 394         pa_log("jack_activate() failed");
 395         goto fail;
 396     }
 397
 398     if (do_connect) {
 399         for (i = 0, p = ports; i < ss.channels; i++, p++) {
 400
 401             if (!*p) {
 402                 pa_log("Not enough physical output ports, leaving unconnected.");
 403                 break;
 404             }
 405
 406             pa_log_info("Connecting %s to %s", jack_port_name(u->port[i]), *p);
 407
 408             if (jack_connect(u->client, jack_port_name(u->port[i]), *p)) {
 409                 pa_log("Failed to connect %s to %s, leaving unconnected.", jack_port_name(u->port[i]), *p);
 410                 break;
 411             }
 412         }
 413     }
 414
 415     pa_sink_put(u->sink);
 416
 417     free(ports);
 418     pa_modargs_free(ma);
 419
 420     return 0;
 421
 422 fail:
 423     if (ma)
 424         pa_modargs_free(ma);
 425
 426     free(ports);
 427
 428     pa__done(m);
 429
 430     return -1;
 431 }
 432
 433 void pa__done(pa_module*m) {
 434     struct userdata *u;
 435
 436     pa_assert(m);
 437
 438     if (!(u = m->userdata))
 439         return;
 440
 441     if (u->client)
 442         jack_client_close(u->client);
 443
 444     if (u->sink)
 445         pa_sink_unlink(u->sink);
 446
 447     if (u->thread) {
 448         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 449         pa_thread_free(u->thread);
 450     }
 451
 452     pa_thread_mq_done(&u->thread_mq);
 453
 454     if (u->sink)
 455         pa_sink_unref(u->sink);
 456
 457     if (u->rtpoll_item)
 458         pa_rtpoll_item_free(u->rtpoll_item);
 459
 460     if (u->jack_msgq)
 461         pa_asyncmsgq_unref(u->jack_msgq);
 462
 463     if (u->rtpoll)
 464         pa_rtpoll_free(u->rtpoll);
 465
 466     pa_xfree(u);
 467 }