code.delx.au - pulseaudio/blob - src/modules/module-jack-sink.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  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 <jack/jack.h>
  39
  40 #include <pulse/xmalloc.h>
  41
  42 #include <pulsecore/core-error.h>
  43 #include <pulsecore/sink.h>
  44 #include <pulsecore/module.h>
  45 #include <pulsecore/core-util.h>
  46 #include <pulsecore/modargs.h>
  47 #include <pulsecore/log.h>
  48 #include <pulsecore/thread.h>
  49 #include <pulsecore/thread-mq.h>
  50 #include <pulsecore/rtpoll.h>
  51 #include <pulsecore/sample-util.h>
  52
  53 #include "module-jack-sink-symdef.h"
  54
  55 /* General overview:
  56  *
  57  * Because JACK has a very unflexible event loop management, which
  58  * doesn't allow us to add our own event sources to the event thread
  59  * we cannot use the JACK real-time thread for dispatching our PA
  60  * work. Instead, we run an additional RT thread which does most of
  61  * the PA handling, and have the JACK RT thread request data from it
  62  * via pa_asyncmsgq. The cost is an additional context switch which
  63  * should hopefully not be that expensive if RT scheduling is
  64  * enabled. A better fix would only be possible with additional event
  65  * source support in JACK.
  66  */
  67
  68 PA_MODULE_AUTHOR("Lennart Poettering")
  69 PA_MODULE_DESCRIPTION("JACK Sink")
  70 PA_MODULE_VERSION(PACKAGE_VERSION)
  71 PA_MODULE_USAGE(
  72         "sink_name=<name of sink> "
  73         "server_name=<jack server name> "
  74         "client_name=<jack client name> "
  75         "channels=<number of channels> "
  76         "connect=<connect ports?> "
  77         "channel_map=<channel map>")
  78
  79 #define DEFAULT_SINK_NAME "jack_out"
  80
  81 struct userdata {
  82     pa_core *core;
  83     pa_module *module;
  84     pa_sink *sink;
  85
  86     unsigned channels;
  87
  88     jack_port_t* port[PA_CHANNELS_MAX];
  89     jack_client_t *client;
  90
  91     void *buffer[PA_CHANNELS_MAX];
  92
  93     pa_thread_mq thread_mq;
  94     pa_asyncmsgq *jack_msgq;
  95     pa_rtpoll *rtpoll;
  96     pa_rtpoll_item *rtpoll_item;
  97
  98     pa_thread *thread;
  99
 100     jack_nframes_t frames_in_buffer;
 101     jack_nframes_t saved_frame_time;
 102     pa_bool_t saved_frame_time_valid;
 103 };
 104
 105 static const char* const valid_modargs[] = {
 106     "sink_name",
 107     "server_name",
 108     "client_name",
 109     "channels",
 110     "connect",
 111     "channel_map",
 112     NULL
 113 };
 114
 115 enum {
 116     SINK_MESSAGE_RENDER = PA_SINK_MESSAGE_MAX,
 117     SINK_MESSAGE_ON_SHUTDOWN
 118 };
 119
 120 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *memchunk) {
 121     struct userdata *u = PA_SINK(o)->userdata;
 122
 123     switch (code) {
 124
 125         case SINK_MESSAGE_RENDER:
 126
 127             /* Handle the request from the JACK thread */
 128
 129             if (u->sink->thread_info.state == PA_SINK_RUNNING) {
 130                 pa_memchunk chunk;
 131                 size_t nbytes;
 132                 void *p;
 133
 134                 pa_assert(offset > 0);
 135                 nbytes = offset * pa_frame_size(&u->sink->sample_spec);
 136
 137                 pa_sink_render_full(u->sink, nbytes, &chunk);
 138
 139                 p = (uint8_t*) pa_memblock_acquire(chunk.memblock) + chunk.index;
 140                 pa_deinterleave(p, u->buffer, u->channels, sizeof(float), offset);
 141                 pa_memblock_release(chunk.memblock);
 142
 143                 pa_memblock_unref(chunk.memblock);
 144             } else {
 145                 unsigned c;
 146                 pa_sample_spec ss;
 147
 148                 /* Humm, we're not RUNNING, hence let's write some silence */
 149
 150                 ss = u->sink->sample_spec;
 151                 ss.channels = 1;
 152
 153                 for (c = 0; c < u->channels; c++)
 154                     pa_silence_memory(u->buffer[c], offset * pa_sample_size(&ss), &ss);
 155             }
 156
 157             u->frames_in_buffer = offset;
 158             u->saved_frame_time = * (jack_nframes_t*) data;
 159             u->saved_frame_time_valid = TRUE;
 160
 161             return 0;
 162
 163         case SINK_MESSAGE_ON_SHUTDOWN:
 164             pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 165             return 0;
 166
 167         case PA_SINK_MESSAGE_GET_LATENCY: {
 168             jack_nframes_t l, ft, d;
 169             size_t n;
 170
 171             /* This is the "worst-case" latency */
 172             l = jack_port_get_total_latency(u->client, u->port[0]) + u->frames_in_buffer;
 173
 174             if (u->saved_frame_time_valid) {
 175                 /* Adjust the worst case latency by the time that
 176                  * passed since we last handed data to JACK */
 177
 178                 ft = jack_frame_time(u->client);
 179                 d = ft > u->saved_frame_time ? ft - u->saved_frame_time : 0;
 180                 l = l > d ? l - d : 0;
 181             }
 182
 183             /* Convert it to usec */
 184             n = l * pa_frame_size(&u->sink->sample_spec);
 185             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->sink->sample_spec);
 186
 187             return 0;
 188         }
 189     }
 190
 191     return pa_sink_process_msg(o, code, data, offset, memchunk);
 192 }
 193
 194 static int jack_process(jack_nframes_t nframes, void *arg) {
 195     struct userdata *u = arg;
 196     unsigned c;
 197     jack_nframes_t frame_time;
 198     pa_assert(u);
 199
 200     /* We just forward the request to our other RT thread */
 201
 202     for (c = 0; c < u->channels; c++)
 203         pa_assert_se(u->buffer[c] = jack_port_get_buffer(u->port[c], nframes));
 204
 205     frame_time = jack_frame_time(u->client);
 206
 207     pa_assert_se(pa_asyncmsgq_send(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_RENDER, &frame_time, nframes, NULL) == 0);
 208     return 0;
 209 }
 210
 211 static void thread_func(void *userdata) {
 212     struct userdata *u = userdata;
 213
 214     pa_assert(u);
 215
 216     pa_log_debug("Thread starting up");
 217
 218     if (u->core->high_priority)
 219         pa_make_realtime();
 220
 221     pa_thread_mq_install(&u->thread_mq);
 222     pa_rtpoll_install(u->rtpoll);
 223
 224     for (;;) {
 225         int ret;
 226
 227         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 228             goto fail;
 229
 230         if (ret == 0)
 231             goto finish;
 232     }
 233
 234 fail:
 235     /* If this was no regular exit from the loop we have to continue
 236      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 237     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 238     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 239
 240 finish:
 241     pa_log_debug("Thread shutting down");
 242 }
 243
 244 static void jack_error_func(const char*t) {
 245     char *s;
 246
 247     s = pa_xstrndup(t, strcspn(t, "\n\r"));
 248     pa_log_warn("JACK error >%s<", s);
 249     pa_xfree(s);
 250 }
 251
 252 static void jack_init(void *arg) {
 253     struct userdata *u = arg;
 254
 255     pa_log_info("JACK thread starting up.");
 256
 257     if (u->core->high_priority)
 258         pa_make_realtime();
 259 }
 260
 261 static void jack_shutdown(void* arg) {
 262     struct userdata *u = arg;
 263
 264     pa_log_info("JACK thread shutting down..");
 265     pa_asyncmsgq_post(u->jack_msgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_ON_SHUTDOWN, NULL, 0, NULL, NULL);
 266 }
 267
 268 int pa__init(pa_module*m) {
 269     struct userdata *u = NULL;
 270     pa_sample_spec ss;
 271     pa_channel_map map;
 272     pa_modargs *ma = NULL;
 273     jack_status_t status;
 274     const char *server_name, *client_name;
 275     uint32_t channels = 0;
 276     int do_connect = 1;
 277     unsigned i;
 278     const char **ports = NULL, **p;
 279     char *t;
 280
 281     pa_assert(m);
 282
 283     jack_set_error_function(jack_error_func);
 284
 285     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 286         pa_log("Failed to parse module arguments.");
 287         goto fail;
 288     }
 289
 290     if (pa_modargs_get_value_boolean(ma, "connect", &do_connect) < 0) {
 291         pa_log("Failed to parse connect= argument.");
 292         goto fail;
 293     }
 294
 295     server_name = pa_modargs_get_value(ma, "server_name", NULL);
 296     client_name = pa_modargs_get_value(ma, "client_name", "PulseAudio JACK Sink");
 297
 298     u = pa_xnew0(struct userdata, 1);
 299     u->core = m->core;
 300     u->module = m;
 301     m->userdata = u;
 302     u->saved_frame_time_valid = FALSE;
 303     pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
 304     u->rtpoll = pa_rtpoll_new();
 305     pa_rtpoll_item_new_asyncmsgq(u->rtpoll, PA_RTPOLL_EARLY, u->thread_mq.inq);
 306
 307     /* The queue linking the JACK thread and our RT thread */
 308     u->jack_msgq = pa_asyncmsgq_new(0);
 309
 310     /* The msgq from the JACK RT thread should have an even higher
 311      * priority than the normal message queues, to match the guarantee
 312      * all other drivers make: supplying the audio device with data is
 313      * the top priority -- and as long as that is possible we don't do
 314      * anything else */
 315     u->rtpoll_item = pa_rtpoll_item_new_asyncmsgq(u->rtpoll, PA_RTPOLL_EARLY-1, u->jack_msgq);
 316
 317     if (!(u->client = jack_client_open(client_name, server_name ? JackServerName : JackNullOption, &status, server_name))) {
 318         pa_log("jack_client_open() failed.");
 319         goto fail;
 320     }
 321
 322     ports = jack_get_ports(u->client, NULL, NULL, JackPortIsPhysical|JackPortIsInput);
 323
 324     channels = 0;
 325     for (p = ports; *p; p++)
 326         channels++;
 327
 328     if (!channels)
 329         channels = m->core->default_sample_spec.channels;
 330
 331     if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 || channels <= 0 || channels >= PA_CHANNELS_MAX) {
 332         pa_log("Failed to parse channels= argument.");
 333         goto fail;
 334     }
 335
 336     pa_channel_map_init_auto(&map, channels, PA_CHANNEL_MAP_ALSA);
 337     if (pa_modargs_get_channel_map(ma, NULL, &map) < 0 || map.channels != channels) {
 338         pa_log("Failed to parse channel_map= argument.");
 339         goto fail;
 340     }
 341
 342     pa_log_info("Successfully connected as '%s'", jack_get_client_name(u->client));
 343
 344     ss.channels = u->channels = channels;
 345     ss.rate = jack_get_sample_rate(u->client);
 346     ss.format = PA_SAMPLE_FLOAT32NE;
 347
 348     pa_assert(pa_sample_spec_valid(&ss));
 349
 350     for (i = 0; i < ss.channels; i++) {
 351         if (!(u->port[i] = jack_port_register(u->client, pa_channel_position_to_string(map.map[i]), JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput|JackPortIsTerminal, 0))) {
 352             pa_log("jack_port_register() failed.");
 353             goto fail;
 354         }
 355     }
 356
 357     if (!(u->sink = pa_sink_new(m->core, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map))) {
 358         pa_log("failed to create sink.");
 359         goto fail;
 360     }
 361
 362     u->sink->parent.process_msg = sink_process_msg;
 363     u->sink->userdata = u;
 364     u->sink->flags = PA_SINK_LATENCY;
 365
 366     pa_sink_set_module(u->sink, m);
 367     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 368     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 369     pa_sink_set_description(u->sink, t = pa_sprintf_malloc("Jack sink (%s)", jack_get_client_name(u->client)));
 370     pa_xfree(t);
 371
 372     jack_set_process_callback(u->client, jack_process, u);
 373     jack_on_shutdown(u->client, jack_shutdown, u);
 374     jack_set_thread_init_callback(u->client, jack_init, u);
 375
 376     if (!(u->thread = pa_thread_new(thread_func, u))) {
 377         pa_log("Failed to create thread.");
 378         goto fail;
 379     }
 380
 381     if (jack_activate(u->client)) {
 382         pa_log("jack_activate() failed");
 383         goto fail;
 384     }
 385
 386     if (do_connect) {
 387         for (i = 0, p = ports; i < ss.channels; i++, p++) {
 388
 389             if (!*p) {
 390                 pa_log("Not enough physical output ports, leaving unconnected.");
 391                 break;
 392             }
 393
 394             pa_log_info("Connecting %s to %s", jack_port_name(u->port[i]), *p);
 395
 396             if (jack_connect(u->client, jack_port_name(u->port[i]), *p)) {
 397                 pa_log("Failed to connect %s to %s, leaving unconnected.", jack_port_name(u->port[i]), *p);
 398                 break;
 399             }
 400         }
 401     }
 402
 403     pa_sink_put(u->sink);
 404
 405     free(ports);
 406     pa_modargs_free(ma);
 407
 408     return 0;
 409
 410 fail:
 411     if (ma)
 412         pa_modargs_free(ma);
 413
 414     free(ports);
 415
 416     pa__done(m);
 417
 418     return -1;
 419 }
 420
 421 void pa__done(pa_module*m) {
 422     struct userdata *u;
 423
 424     pa_assert(m);
 425
 426     if (!(u = m->userdata))
 427         return;
 428
 429     if (u->client)
 430         jack_client_close(u->client);
 431
 432     if (u->sink)
 433         pa_sink_unlink(u->sink);
 434
 435     if (u->thread) {
 436         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 437         pa_thread_free(u->thread);
 438     }
 439
 440     pa_thread_mq_done(&u->thread_mq);
 441
 442     if (u->sink)
 443         pa_sink_unref(u->sink);
 444
 445     if (u->rtpoll_item)
 446         pa_rtpoll_item_free(u->rtpoll_item);
 447
 448     if (u->jack_msgq)
 449         pa_asyncmsgq_unref(u->jack_msgq);
 450
 451     if (u->rtpoll)
 452         pa_rtpoll_free(u->rtpoll);
 453
 454     pa_xfree(u);
 455 }