code.delx.au - pulseaudio/blob - src/pulsecore/protocol-simple.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 <assert.h>
  27 #include <stdlib.h>
  28 #include <limits.h>
  29 #include <stdio.h>
  30 #include <errno.h>
  31 #include <string.h>
  32
  33 #include <pulse/xmalloc.h>
  34
  35 #include <pulsecore/sink-input.h>
  36 #include <pulsecore/source-output.h>
  37 #include <pulsecore/client.h>
  38 #include <pulsecore/sample-util.h>
  39 #include <pulsecore/namereg.h>
  40 #include <pulsecore/log.h>
  41 #include <pulsecore/core-error.h>
  42
  43 #include "protocol-simple.h"
  44
  45 /* Don't allow more than this many concurrent connections */
  46 #define MAX_CONNECTIONS 10
  47
  48 struct connection {
  49     pa_protocol_simple *protocol;
  50     pa_iochannel *io;
  51     pa_sink_input *sink_input;
  52     pa_source_output *source_output;
  53     pa_client *client;
  54     pa_memblockq *input_memblockq, *output_memblockq;
  55     pa_defer_event *defer_event;
  56
  57     int dead;
  58
  59     struct {
  60         pa_memblock *current_memblock;
  61         size_t memblock_index, fragment_size;
  62     } playback;
  63 };
  64
  65 struct pa_protocol_simple {
  66     pa_module *module;
  67     pa_core *core;
  68     pa_socket_server*server;
  69     pa_idxset *connections;
  70     enum {
  71         RECORD = 1,
  72         PLAYBACK = 2,
  73         DUPLEX = 3
  74     } mode;
  75     pa_sample_spec sample_spec;
  76     char *source_name, *sink_name;
  77 };
  78
  79 #define PLAYBACK_BUFFER_SECONDS (.5)
  80 #define PLAYBACK_BUFFER_FRAGMENTS (10)
  81 #define RECORD_BUFFER_SECONDS (5)
  82 #define RECORD_BUFFER_FRAGMENTS (100)
  83
  84 static void connection_free(struct connection *c) {
  85     assert(c);
  86
  87     pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
  88
  89     if (c->playback.current_memblock)
  90         pa_memblock_unref(c->playback.current_memblock);
  91     if (c->sink_input) {
  92         pa_sink_input_disconnect(c->sink_input);
  93         pa_sink_input_unref(c->sink_input);
  94     }
  95     if (c->source_output) {
  96         pa_source_output_disconnect(c->source_output);
  97         pa_source_output_unref(c->source_output);
  98     }
  99     if (c->client)
 100         pa_client_free(c->client);
 101     if (c->io)
 102         pa_iochannel_free(c->io);
 103     if (c->input_memblockq)
 104         pa_memblockq_free(c->input_memblockq);
 105     if (c->output_memblockq)
 106         pa_memblockq_free(c->output_memblockq);
 107     if (c->defer_event)
 108         c->protocol->core->mainloop->defer_free(c->defer_event);
 109     pa_xfree(c);
 110 }
 111
 112 static int do_read(struct connection *c) {
 113     pa_memchunk chunk;
 114     ssize_t r;
 115     size_t l;
 116
 117     if (!c->sink_input || !(l = pa_memblockq_missing(c->input_memblockq)))
 118         return 0;
 119
 120     if (l > c->playback.fragment_size)
 121         l = c->playback.fragment_size;
 122
 123     if (c->playback.current_memblock)
 124         if (c->playback.current_memblock->length - c->playback.memblock_index < l) {
 125             pa_memblock_unref(c->playback.current_memblock);
 126             c->playback.current_memblock = NULL;
 127             c->playback.memblock_index = 0;
 128         }
 129
 130     if (!c->playback.current_memblock) {
 131         c->playback.current_memblock = pa_memblock_new(c->playback.fragment_size*2, c->protocol->core->memblock_stat);
 132         assert(c->playback.current_memblock && c->playback.current_memblock->length >= l);
 133         c->playback.memblock_index = 0;
 134     }
 135
 136     if ((r = pa_iochannel_read(c->io, (uint8_t*) c->playback.current_memblock->data+c->playback.memblock_index, l)) <= 0) {
 137         pa_log_debug(__FILE__": read(): %s", r == 0 ? "EOF" : pa_cstrerror(errno));
 138         return -1;
 139     }
 140
 141     chunk.memblock = c->playback.current_memblock;
 142     chunk.index = c->playback.memblock_index;
 143     chunk.length = r;
 144     assert(chunk.memblock);
 145
 146     c->playback.memblock_index += r;
 147
 148     assert(c->input_memblockq);
 149     pa_memblockq_push_align(c->input_memblockq, &chunk);
 150     assert(c->sink_input);
 151     pa_sink_notify(c->sink_input->sink);
 152
 153     return 0;
 154 }
 155
 156 static int do_write(struct connection *c) {
 157     pa_memchunk chunk;
 158     ssize_t r;
 159
 160     if (!c->source_output)
 161         return 0;
 162
 163     assert(c->output_memblockq);
 164     if (pa_memblockq_peek(c->output_memblockq, &chunk) < 0)
 165         return 0;
 166
 167     assert(chunk.memblock && chunk.length);
 168
 169     if ((r = pa_iochannel_write(c->io, (uint8_t*) chunk.memblock->data+chunk.index, chunk.length)) < 0) {
 170         pa_memblock_unref(chunk.memblock);
 171         pa_log(__FILE__": write(): %s", pa_cstrerror(errno));
 172         return -1;
 173     }
 174
 175     pa_memblockq_drop(c->output_memblockq, &chunk, r);
 176     pa_memblock_unref(chunk.memblock);
 177
 178     pa_source_notify(c->source_output->source);
 179
 180     return 0;
 181 }
 182
 183 static void do_work(struct connection *c) {
 184     assert(c);
 185
 186     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 187     c->protocol->core->mainloop->defer_enable(c->defer_event, 0);
 188
 189     if (c->dead)
 190         return;
 191
 192     if (pa_iochannel_is_readable(c->io)) {
 193         if (do_read(c) < 0)
 194             goto fail;
 195     } else if (pa_iochannel_is_hungup(c->io))
 196         goto fail;
 197
 198     if (pa_iochannel_is_writable(c->io)) {
 199         if (do_write(c) < 0)
 200             goto fail;
 201     }
 202
 203     return;
 204
 205 fail:
 206
 207     if (c->sink_input) {
 208         c->dead = 1;
 209
 210         pa_iochannel_free(c->io);
 211         c->io = NULL;
 212
 213         pa_memblockq_prebuf_disable(c->input_memblockq);
 214         pa_sink_notify(c->sink_input->sink);
 215     } else
 216         connection_free(c);
 217 }
 218
 219 /*** sink_input callbacks ***/
 220
 221 static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk) {
 222     struct connection*c;
 223     assert(i && i->userdata && chunk);
 224     c = i->userdata;
 225
 226     if (pa_memblockq_peek(c->input_memblockq, chunk) < 0) {
 227
 228         if (c->dead)
 229             connection_free(c);
 230
 231         return -1;
 232     }
 233
 234     return 0;
 235 }
 236
 237 static void sink_input_drop_cb(pa_sink_input *i, const pa_memchunk *chunk, size_t length) {
 238     struct connection*c = i->userdata;
 239     assert(i && c && length);
 240
 241     pa_memblockq_drop(c->input_memblockq, chunk, length);
 242
 243     /* do something */
 244     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 245     c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
 246 }
 247
 248 static void sink_input_kill_cb(pa_sink_input *i) {
 249     assert(i && i->userdata);
 250     connection_free((struct connection *) i->userdata);
 251 }
 252
 253
 254 static pa_usec_t sink_input_get_latency_cb(pa_sink_input *i) {
 255     struct connection*c = i->userdata;
 256     assert(i && c);
 257     return pa_bytes_to_usec(pa_memblockq_get_length(c->input_memblockq), &c->sink_input->sample_spec);
 258 }
 259
 260 /*** source_output callbacks ***/
 261
 262 static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
 263     struct connection *c = o->userdata;
 264     assert(o && c && chunk);
 265
 266     pa_memblockq_push(c->output_memblockq, chunk);
 267
 268     /* do something */
 269     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 270     c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
 271 }
 272
 273 static void source_output_kill_cb(pa_source_output *o) {
 274     assert(o && o->userdata);
 275     connection_free((struct connection *) o->userdata);
 276 }
 277
 278 static pa_usec_t source_output_get_latency_cb(pa_source_output *o) {
 279     struct connection*c = o->userdata;
 280     assert(o && c);
 281     return pa_bytes_to_usec(pa_memblockq_get_length(c->output_memblockq), &c->source_output->sample_spec);
 282 }
 283
 284 /*** client callbacks ***/
 285
 286 static void client_kill_cb(pa_client *c) {
 287     assert(c && c->userdata);
 288     connection_free((struct connection *) c->userdata);
 289 }
 290
 291 /*** pa_iochannel callbacks ***/
 292
 293 static void io_callback(pa_iochannel*io, void *userdata) {
 294     struct connection *c = userdata;
 295     assert(io && c && c->io == io);
 296
 297     do_work(c);
 298 }
 299
 300 /*** fixed callback ***/
 301
 302 static void defer_callback(pa_mainloop_api*a, pa_defer_event *e, void *userdata) {
 303     struct connection *c = userdata;
 304     assert(a && c && c->defer_event == e);
 305
 306     do_work(c);
 307 }
 308
 309 /*** socket_server callbacks ***/
 310
 311 static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata) {
 312     pa_protocol_simple *p = userdata;
 313     struct connection *c = NULL;
 314     char cname[256];
 315     assert(s && io && p);
 316
 317     if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) {
 318         pa_log(__FILE__": Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS);
 319         pa_iochannel_free(io);
 320         return;
 321     }
 322
 323     c = pa_xmalloc(sizeof(struct connection));
 324     c->io = io;
 325     c->sink_input = NULL;
 326     c->source_output = NULL;
 327     c->defer_event = NULL;
 328     c->input_memblockq = c->output_memblockq = NULL;
 329     c->protocol = p;
 330     c->playback.current_memblock = NULL;
 331     c->playback.memblock_index = 0;
 332     c->playback.fragment_size = 0;
 333     c->dead = 0;
 334
 335     pa_iochannel_socket_peer_to_string(io, cname, sizeof(cname));
 336     c->client = pa_client_new(p->core, __FILE__, cname);
 337     assert(c->client);
 338     c->client->owner = p->module;
 339     c->client->kill = client_kill_cb;
 340     c->client->userdata = c;
 341
 342     if (p->mode & PLAYBACK) {
 343         pa_sink *sink;
 344         size_t l;
 345
 346         if (!(sink = pa_namereg_get(p->core, p->sink_name, PA_NAMEREG_SINK, 1))) {
 347             pa_log(__FILE__": Failed to get sink.");
 348             goto fail;
 349         }
 350
 351         if (!(c->sink_input = pa_sink_input_new(sink, __FILE__, c->client->name, &p->sample_spec, NULL, NULL, 0, -1))) {
 352             pa_log(__FILE__": Failed to create sink input.");
 353             goto fail;
 354         }
 355
 356         c->sink_input->owner = p->module;
 357         c->sink_input->client = c->client;
 358
 359         c->sink_input->peek = sink_input_peek_cb;
 360         c->sink_input->drop = sink_input_drop_cb;
 361         c->sink_input->kill = sink_input_kill_cb;
 362         c->sink_input->get_latency = sink_input_get_latency_cb;
 363         c->sink_input->userdata = c;
 364
 365         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*PLAYBACK_BUFFER_SECONDS);
 366         c->input_memblockq = pa_memblockq_new(
 367                 0,
 368                 l,
 369                 0,
 370                 pa_frame_size(&p->sample_spec),
 371                 (size_t) -1,
 372                 l/PLAYBACK_BUFFER_FRAGMENTS,
 373                 NULL,
 374                 p->core->memblock_stat);
 375         assert(c->input_memblockq);
 376         pa_iochannel_socket_set_rcvbuf(io, l/PLAYBACK_BUFFER_FRAGMENTS*5);
 377         c->playback.fragment_size = l/10;
 378     }
 379
 380     if (p->mode & RECORD) {
 381         pa_source *source;
 382         size_t l;
 383
 384         if (!(source = pa_namereg_get(p->core, p->source_name, PA_NAMEREG_SOURCE, 1))) {
 385             pa_log(__FILE__": Failed to get source.");
 386             goto fail;
 387         }
 388
 389         c->source_output = pa_source_output_new(source, __FILE__, c->client->name, &p->sample_spec, NULL, -1);
 390         if (!c->source_output) {
 391             pa_log(__FILE__": Failed to create source output.");
 392             goto fail;
 393         }
 394         c->source_output->owner = p->module;
 395         c->source_output->client = c->client;
 396
 397         c->source_output->push = source_output_push_cb;
 398         c->source_output->kill = source_output_kill_cb;
 399         c->source_output->get_latency = source_output_get_latency_cb;
 400         c->source_output->userdata = c;
 401
 402         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*RECORD_BUFFER_SECONDS);
 403         c->output_memblockq = pa_memblockq_new(
 404                 0,
 405                 l,
 406                 0,
 407                 pa_frame_size(&p->sample_spec),
 408                 1,
 409                 0,
 410                 NULL,
 411                 p->core->memblock_stat);
 412         pa_iochannel_socket_set_sndbuf(io, l/RECORD_BUFFER_FRAGMENTS*2);
 413     }
 414
 415     pa_iochannel_set_callback(c->io, io_callback, c);
 416     pa_idxset_put(p->connections, c, NULL);
 417
 418     c->defer_event = p->core->mainloop->defer_new(p->core->mainloop, defer_callback, c);
 419     assert(c->defer_event);
 420     p->core->mainloop->defer_enable(c->defer_event, 0);
 421
 422     return;
 423
 424 fail:
 425     if (c)
 426         connection_free(c);
 427 }
 428
 429 pa_protocol_simple* pa_protocol_simple_new(pa_core *core, pa_socket_server *server, pa_module *m, pa_modargs *ma) {
 430     pa_protocol_simple* p = NULL;
 431     int enable;
 432     assert(core && server && ma);
 433
 434     p = pa_xmalloc0(sizeof(pa_protocol_simple));
 435     p->module = m;
 436     p->core = core;
 437     p->server = server;
 438     p->connections = pa_idxset_new(NULL, NULL);
 439
 440     p->sample_spec = core->default_sample_spec;
 441     if (pa_modargs_get_sample_spec(ma, &p->sample_spec) < 0) {
 442         pa_log(__FILE__": Failed to parse sample type specification.");
 443         goto fail;
 444     }
 445
 446     p->source_name = pa_xstrdup(pa_modargs_get_value(ma, "source", NULL));
 447     p->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 448
 449     enable = 0;
 450     if (pa_modargs_get_value_boolean(ma, "record", &enable) < 0) {
 451         pa_log(__FILE__": record= expects a numeric argument.");
 452         goto fail;
 453     }
 454     p->mode = enable ? RECORD : 0;
 455
 456     enable = 1;
 457     if (pa_modargs_get_value_boolean(ma, "playback", &enable) < 0) {
 458         pa_log(__FILE__": playback= expects a numeric argument.");
 459         goto fail;
 460     }
 461     p->mode |= enable ? PLAYBACK : 0;
 462
 463     if ((p->mode & (RECORD|PLAYBACK)) == 0) {
 464         pa_log(__FILE__": neither playback nor recording enabled for protocol.");
 465         goto fail;
 466     }
 467
 468     pa_socket_server_set_callback(p->server, on_connection, p);
 469
 470     return p;
 471
 472 fail:
 473     if (p)
 474         pa_protocol_simple_free(p);
 475     return NULL;
 476 }
 477
 478
 479 void pa_protocol_simple_free(pa_protocol_simple *p) {
 480     struct connection *c;
 481     assert(p);
 482
 483     if (p->connections) {
 484         while((c = pa_idxset_first(p->connections, NULL)))
 485             connection_free(c);
 486
 487         pa_idxset_free(p->connections, NULL, NULL);
 488     }
 489
 490     if (p->server)
 491         pa_socket_server_unref(p->server);
 492     pa_xfree(p);
 493 }
 494