code.delx.au - pulseaudio/blob - src/modules/jack/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 2.1 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 for the sink> "
  71         "sink_properties=<properties  for the card> "
  72         "server_name=<jack server name> "
  73         "client_name=<jack client name> "
  74         "channels=<number of channels> "
  75         "channel_map=<channel map> "
  76         "connect=<connect ports?>");
  77
  78 #define DEFAULT_SINK_NAME "jack_out"
  79
  80 struct userdata {
  81     pa_core *core;
  82     pa_module *module;
  83     pa_sink *sink;
  84
  85     unsigned channels;
  86
  87     jack_port_t* port[PA_CHANNELS_MAX];
  88     jack_client_t *client;
  89
  90     void *buffer[PA_CHANNELS_MAX];
  91
  92     pa_thread_mq thread_mq;
  93     pa_asyncmsgq *jack_msgq;
  94     pa_rtpoll *rtpoll;
  95     pa_rtpoll_item *rtpoll_item;
  96
  97     pa_thread *thread;
  98
  99     jack_nframes_t frames_in_buffer;
 100     jack_nframes_t saved_frame_time;
 101     pa_bool_t saved_frame_time_valid;
 102 };
 103
 104 static const char* const valid_modargs[] = {
 105     "sink_name",
 106     "sink_properties",
 107     "server_name",
 108     "client_name",
 109     "channels",
 110     "channel_map",
 111     "connect",
 112     NULL
 113 };
 114
 115 enum {
 116     SINK_MESSAGE_RENDER = PA_SINK_MESSAGE_MAX,
 117     SINK_MESSAGE_BUFFER_SIZE,
 118     SINK_MESSAGE_ON_SHUTDOWN
 119 };
 120
 121 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *memchunk) {
 122     struct userdata *u = PA_SINK(o)->userdata;
 123
 124     switch (code) {
 125
 126         case SINK_MESSAGE_RENDER:
 127
 128             /* Handle the request from the JACK thread */
 129
 130             if (u->sink->thread_info.state == PA_SINK_RUNNING) {
 131                 pa_memchunk chunk;
 132                 size_t nbytes;
 133                 void *p;
 134
 135                 pa_assert(offset > 0);
 136                 nbytes = (size_t) offset * pa_frame_size(&u->sink->sample_spec);
 137
 138                 pa_sink_render_full(u->sink, nbytes, &chunk);
 139
 140                 p = (uint8_t*) pa_memblock_acquire(chunk.memblock) + chunk.index;
 141                 pa_deinterleave(p, u->buffer, u->channels, sizeof(float), (unsigned) offset);
 142                 pa_memblock_release(chunk.memblock);
 143
 144                 pa_memblock_unref(chunk.memblock);
 145             } else {
 146                 unsigned c;
 147                 pa_sample_spec ss;
 148
 149                 /* Humm, we're not RUNNING, hence let's write some silence */
 150
 151                 ss = u->sink->sample_spec;
 152                 ss.channels = 1;
 153
 154                 for (c = 0; c < u->channels; c++)
 155                     pa_silence_memory(u->buffer[c], (size_t) offset * pa_sample_size(&ss), &ss);
 156             }
 157
 158             u->frames_in_buffer = (jack_nframes_t) offset;
 159             u->saved_frame_time = * (jack_nframes_t*) data;
 160             u->saved_frame_time_valid = TRUE;
 161
 162             return 0;
 163
 164         case SINK_MESSAGE_BUFFER_SIZE:
 165             pa_sink_set_max_request_within_thread(u->sink, (size_t) offset * pa_frame_size(&u->sink->sample_spec));
 166             return 0;
 167
 168         case SINK_MESSAGE_ON_SHUTDOWN:
 169             pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 170             return 0;
 171
 172         case PA_SINK_MESSAGE_GET_LATENCY: {
 173             jack_nframes_t l, ft, d;
 174             size_t n;
 175
 176             /* This is the "worst-case" latency */
 177             l = jack_port_get_total_latency(u->client, u->port[0]) + u->frames_in_buffer;
 178
 179             if (u->saved_frame_time_valid) {
 180                 /* Adjust the worst case latency by the time that
 181                  * passed since we last handed data to JACK */
 182
 183                 ft = jack_frame_time(u->client);
 184                 d = ft > u->saved_frame_time ? ft - u->saved_frame_time : 0;
 185                 l = l > d ? l - d : 0;
 186             }
 187
 188             /* Convert it to usec */
 189             n = l * pa_frame_size(&u->sink->sample_spec);
 190             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->sink->sample_spec);
 191
 192             return 0;
 193         }
 194
 195     }
 196
 197     return pa_sink_process_msg(o, code, data, offset, memchunk);
 198 }
 199
 200 static int jack_process(jack_nframes_t nframes, void *arg) {
 201     struct userdata *u = arg;
 202     unsigned c;
 203     jack_nframes_t frame_time;
 204     pa_assert(u);
 205
 206     /* We just forward the request to our other RT thread */
 207
 208     for (c = 0; c < u->channels; c++)
 209         pa_assert_se(u->buffer[c] = jack_port_get_buffer(u->port[c], nframes));
 210
 211     frame_time = jack_frame_time(u->client);
 212
 213     pa_assert_se(pa_asyncmsgq_send(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_RENDER, &frame_time, nframes, NULL) == 0);
 214     return 0;
 215 }
 216
 217 static void thread_func(void *userdata) {
 218     struct userdata *u = userdata;
 219
 220     pa_assert(u);
 221
 222     pa_log_debug("Thread starting up");
 223
 224     if (u->core->realtime_scheduling)
 225         pa_make_realtime(u->core->realtime_priority);
 226
 227     pa_thread_mq_install(&u->thread_mq);
 228
 229     for (;;) {
 230         int ret;
 231
 232         if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
 233             if (u->sink->thread_info.rewind_requested)
 234                 pa_sink_process_rewind(u->sink, 0);
 235
 236         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 237             goto fail;
 238
 239         if (ret == 0)
 240             goto finish;
 241     }
 242
 243 fail:
 244     /* If this was no regular exit from the loop we have to continue
 245      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 246     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 247     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 248
 249 finish:
 250     pa_log_debug("Thread shutting down");
 251 }
 252
 253 static void jack_error_func(const char*t) {
 254     char *s;
 255
 256     s = pa_xstrndup(t, strcspn(t, "\n\r"));
 257     pa_log_warn("JACK error >%s<", s);
 258     pa_xfree(s);
 259 }
 260
 261 static void jack_init(void *arg) {
 262     struct userdata *u = arg;
 263
 264     pa_log_info("JACK thread starting up.");
 265
 266     if (u->core->realtime_scheduling)
 267         pa_make_realtime(u->core->realtime_priority+4);
 268 }
 269
 270 static void jack_shutdown(void* arg) {
 271     struct userdata *u = arg;
 272
 273     pa_log_info("JACK thread shutting down.");
 274     pa_asyncmsgq_post(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_ON_SHUTDOWN, NULL, 0, NULL, NULL);
 275 }
 276
 277 static int jack_buffer_size(jack_nframes_t nframes, void *arg) {
 278     struct userdata *u = arg;
 279
 280     pa_log_info("JACK buffer size changed.");
 281     pa_asyncmsgq_post(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_BUFFER_SIZE, NULL, nframes, NULL, NULL);
 282     return 0;
 283 }
 284
 285 int pa__init(pa_module*m) {
 286     struct userdata *u = NULL;
 287     pa_sample_spec ss;
 288     pa_channel_map map;
 289     pa_modargs *ma = NULL;
 290     jack_status_t status;
 291     const char *server_name, *client_name;
 292     uint32_t channels = 0;
 293     pa_bool_t do_connect = TRUE;
 294     unsigned i;
 295     const char **ports = NULL, **p;
 296     pa_sink_new_data data;
 297
 298     pa_assert(m);
 299
 300     jack_set_error_function(jack_error_func);
 301
 302     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 303         pa_log("Failed to parse module arguments.");
 304         goto fail;
 305     }
 306
 307     if (pa_modargs_get_value_boolean(ma, "connect", &do_connect) < 0) {
 308         pa_log("Failed to parse connect= argument.");
 309         goto fail;
 310     }
 311
 312     server_name = pa_modargs_get_value(ma, "server_name", NULL);
 313     client_name = pa_modargs_get_value(ma, "client_name", "PulseAudio JACK Sink");
 314
 315     m->userdata = u = pa_xnew0(struct userdata, 1);
 316     u->core = m->core;
 317     u->module = m;
 318     u->saved_frame_time_valid = FALSE;
 319     u->rtpoll = pa_rtpoll_new();
 320     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 321
 322     /* The queue linking the JACK thread and our RT thread */
 323     u->jack_msgq = pa_asyncmsgq_new(0);
 324
 325     /* The msgq from the JACK RT thread should have an even higher
 326      * priority than the normal message queues, to match the guarantee
 327      * all other drivers make: supplying the audio device with data is
 328      * the top priority -- and as long as that is possible we don't do
 329      * anything else */
 330     u->rtpoll_item = pa_rtpoll_item_new_asyncmsgq_read(u->rtpoll, PA_RTPOLL_EARLY-1, u->jack_msgq);
 331
 332     if (!(u->client = jack_client_open(client_name, server_name ? JackServerName : JackNullOption, &status, server_name))) {
 333         pa_log("jack_client_open() failed.");
 334         goto fail;
 335     }
 336
 337     ports = jack_get_ports(u->client, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortIsPhysical|JackPortIsInput);
 338
 339     channels = 0;
 340     for (p = ports; *p; p++)
 341         channels++;
 342
 343     if (!channels)
 344         channels = m->core->default_sample_spec.channels;
 345
 346     if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 ||
 347         channels <= 0 ||
 348         channels > PA_CHANNELS_MAX) {
 349         pa_log("Failed to parse channels= argument.");
 350         goto fail;
 351     }
 352
 353     if (channels == m->core->default_channel_map.channels)
 354         map = m->core->default_channel_map;
 355     else
 356         pa_channel_map_init_extend(&map, channels, PA_CHANNEL_MAP_ALSA);
 357
 358     if (pa_modargs_get_channel_map(ma, NULL, &map) < 0 || map.channels != channels) {
 359         pa_log("Failed to parse channel_map= argument.");
 360         goto fail;
 361     }
 362
 363     pa_log_info("Successfully connected as '%s'", jack_get_client_name(u->client));
 364
 365     u->channels = ss.channels = (uint8_t) channels;
 366     ss.rate = jack_get_sample_rate(u->client);
 367     ss.format = PA_SAMPLE_FLOAT32NE;
 368
 369     pa_assert(pa_sample_spec_valid(&ss));
 370
 371     for (i = 0; i < ss.channels; i++) {
 372         if (!(u->port[i] = jack_port_register(u->client, pa_channel_position_to_string(map.map[i]), JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput|JackPortIsTerminal, 0))) {
 373             pa_log("jack_port_register() failed.");
 374             goto fail;
 375         }
 376     }
 377
 378     pa_sink_new_data_init(&data);
 379     data.driver = __FILE__;
 380     data.module = m;
 381     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 382     pa_sink_new_data_set_sample_spec(&data, &ss);
 383     pa_sink_new_data_set_channel_map(&data, &map);
 384     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "jack");
 385     if (server_name)
 386         pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, server_name);
 387     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Jack sink (%s)", jack_get_client_name(u->client));
 388     pa_proplist_sets(data.proplist, "jack.client_name", jack_get_client_name(u->client));
 389
 390     if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 391         pa_log("Invalid properties");
 392         pa_sink_new_data_done(&data);
 393         goto fail;
 394     }
 395
 396     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
 397     pa_sink_new_data_done(&data);
 398
 399     if (!u->sink) {
 400         pa_log("Failed to create sink.");
 401         goto fail;
 402     }
 403
 404     u->sink->parent.process_msg = sink_process_msg;
 405     u->sink->userdata = u;
 406
 407     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 408     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 409     pa_sink_set_max_request(u->sink, jack_get_buffer_size(u->client) * pa_frame_size(&u->sink->sample_spec));
 410
 411     jack_set_process_callback(u->client, jack_process, u);
 412     jack_on_shutdown(u->client, jack_shutdown, u);
 413     jack_set_thread_init_callback(u->client, jack_init, u);
 414     jack_set_buffer_size_callback(u->client, jack_buffer_size, u);
 415
 416     if (!(u->thread = pa_thread_new(thread_func, u))) {
 417         pa_log("Failed to create thread.");
 418         goto fail;
 419     }
 420
 421     if (jack_activate(u->client)) {
 422         pa_log("jack_activate() failed");
 423         goto fail;
 424     }
 425
 426     if (do_connect) {
 427         for (i = 0, p = ports; i < ss.channels; i++, p++) {
 428
 429             if (!*p) {
 430                 pa_log("Not enough physical output ports, leaving unconnected.");
 431                 break;
 432             }
 433
 434             pa_log_info("Connecting %s to %s", jack_port_name(u->port[i]), *p);
 435
 436             if (jack_connect(u->client, jack_port_name(u->port[i]), *p)) {
 437                 pa_log("Failed to connect %s to %s, leaving unconnected.", jack_port_name(u->port[i]), *p);
 438                 break;
 439             }
 440         }
 441     }
 442
 443     pa_sink_put(u->sink);
 444
 445     free(ports);
 446     pa_modargs_free(ma);
 447
 448     return 0;
 449
 450 fail:
 451     if (ma)
 452         pa_modargs_free(ma);
 453
 454     free(ports);
 455
 456     pa__done(m);
 457
 458     return -1;
 459 }
 460
 461 int pa__get_n_used(pa_module *m) {
 462     struct userdata *u;
 463
 464     pa_assert(m);
 465     pa_assert_se(u = m->userdata);
 466
 467     return pa_sink_linked_by(u->sink);
 468 }
 469
 470 void pa__done(pa_module*m) {
 471     struct userdata *u;
 472
 473     pa_assert(m);
 474
 475     if (!(u = m->userdata))
 476         return;
 477
 478     if (u->client)
 479         jack_client_close(u->client);
 480
 481     if (u->sink)
 482         pa_sink_unlink(u->sink);
 483
 484     if (u->thread) {
 485         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 486         pa_thread_free(u->thread);
 487     }
 488
 489     pa_thread_mq_done(&u->thread_mq);
 490
 491     if (u->sink)
 492         pa_sink_unref(u->sink);
 493
 494     if (u->rtpoll_item)
 495         pa_rtpoll_item_free(u->rtpoll_item);
 496
 497     if (u->jack_msgq)
 498         pa_asyncmsgq_unref(u->jack_msgq);
 499
 500     if (u->rtpoll)
 501         pa_rtpoll_free(u->rtpoll);
 502
 503     pa_xfree(u);
 504 }