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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 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 <assert.h>
  29 #include <stdlib.h>
  30 #include <limits.h>
  31 #include <stdio.h>
  32 #include <errno.h>
  33 #include <string.h>
  34
  35 #include <pulse/xmalloc.h>
  36
  37 #include <pulsecore/sink-input.h>
  38 #include <pulsecore/source-output.h>
  39 #include <pulsecore/client.h>
  40 #include <pulsecore/sample-util.h>
  41 #include <pulsecore/namereg.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/core-error.h>
  44
  45 #include "protocol-simple.h"
  46
  47 /* Don't allow more than this many concurrent connections */
  48 #define MAX_CONNECTIONS 10
  49
  50 struct connection {
  51     pa_protocol_simple *protocol;
  52     pa_iochannel *io;
  53     pa_sink_input *sink_input;
  54     pa_source_output *source_output;
  55     pa_client *client;
  56     pa_memblockq *input_memblockq, *output_memblockq;
  57     pa_defer_event *defer_event;
  58
  59     int dead;
  60
  61     struct {
  62         pa_memblock *current_memblock;
  63         size_t memblock_index, fragment_size;
  64     } playback;
  65 };
  66
  67 struct pa_protocol_simple {
  68     pa_module *module;
  69     pa_core *core;
  70     pa_socket_server*server;
  71     pa_idxset *connections;
  72     enum {
  73         RECORD = 1,
  74         PLAYBACK = 2,
  75         DUPLEX = 3
  76     } mode;
  77     pa_sample_spec sample_spec;
  78     char *source_name, *sink_name;
  79 };
  80
  81 #define PLAYBACK_BUFFER_SECONDS (.5)
  82 #define PLAYBACK_BUFFER_FRAGMENTS (10)
  83 #define RECORD_BUFFER_SECONDS (5)
  84 #define RECORD_BUFFER_FRAGMENTS (100)
  85
  86 static void connection_free(struct connection *c) {
  87     assert(c);
  88
  89     pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
  90
  91     if (c->playback.current_memblock)
  92         pa_memblock_unref(c->playback.current_memblock);
  93     if (c->sink_input) {
  94         pa_sink_input_disconnect(c->sink_input);
  95         pa_sink_input_unref(c->sink_input);
  96     }
  97     if (c->source_output) {
  98         pa_source_output_disconnect(c->source_output);
  99         pa_source_output_unref(c->source_output);
 100     }
 101     if (c->client)
 102         pa_client_free(c->client);
 103     if (c->io)
 104         pa_iochannel_free(c->io);
 105     if (c->input_memblockq)
 106         pa_memblockq_free(c->input_memblockq);
 107     if (c->output_memblockq)
 108         pa_memblockq_free(c->output_memblockq);
 109     if (c->defer_event)
 110         c->protocol->core->mainloop->defer_free(c->defer_event);
 111     pa_xfree(c);
 112 }
 113
 114 static int do_read(struct connection *c) {
 115     pa_memchunk chunk;
 116     ssize_t r;
 117     size_t l;
 118
 119     if (!c->sink_input || !(l = pa_memblockq_missing(c->input_memblockq)))
 120         return 0;
 121
 122     if (l > c->playback.fragment_size)
 123         l = c->playback.fragment_size;
 124
 125     if (c->playback.current_memblock)
 126         if (c->playback.current_memblock->length - c->playback.memblock_index < l) {
 127             pa_memblock_unref(c->playback.current_memblock);
 128             c->playback.current_memblock = NULL;
 129             c->playback.memblock_index = 0;
 130         }
 131
 132     if (!c->playback.current_memblock) {
 133         c->playback.current_memblock = pa_memblock_new(c->protocol->core->mempool, c->playback.fragment_size*2);
 134         assert(c->playback.current_memblock && c->playback.current_memblock->length >= l);
 135         c->playback.memblock_index = 0;
 136     }
 137
 138     if ((r = pa_iochannel_read(c->io, (uint8_t*) c->playback.current_memblock->data+c->playback.memblock_index, l)) <= 0) {
 139         pa_log_debug("read(): %s", r == 0 ? "EOF" : pa_cstrerror(errno));
 140         return -1;
 141     }
 142
 143     chunk.memblock = c->playback.current_memblock;
 144     chunk.index = c->playback.memblock_index;
 145     chunk.length = r;
 146     assert(chunk.memblock);
 147
 148     c->playback.memblock_index += r;
 149
 150     assert(c->input_memblockq);
 151     pa_memblockq_push_align(c->input_memblockq, &chunk);
 152     assert(c->sink_input);
 153     pa_sink_notify(c->sink_input->sink);
 154
 155     return 0;
 156 }
 157
 158 static int do_write(struct connection *c) {
 159     pa_memchunk chunk;
 160     ssize_t r;
 161
 162     if (!c->source_output)
 163         return 0;
 164
 165     assert(c->output_memblockq);
 166     if (pa_memblockq_peek(c->output_memblockq, &chunk) < 0)
 167         return 0;
 168
 169     assert(chunk.memblock && chunk.length);
 170
 171     if ((r = pa_iochannel_write(c->io, (uint8_t*) chunk.memblock->data+chunk.index, chunk.length)) < 0) {
 172         pa_memblock_unref(chunk.memblock);
 173         pa_log("write(): %s", pa_cstrerror(errno));
 174         return -1;
 175     }
 176
 177     pa_memblockq_drop(c->output_memblockq, &chunk, r);
 178     pa_memblock_unref(chunk.memblock);
 179
 180     pa_source_notify(c->source_output->source);
 181
 182     return 0;
 183 }
 184
 185 static void do_work(struct connection *c) {
 186     assert(c);
 187
 188     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 189     c->protocol->core->mainloop->defer_enable(c->defer_event, 0);
 190
 191     if (c->dead)
 192         return;
 193
 194     if (pa_iochannel_is_readable(c->io)) {
 195         if (do_read(c) < 0)
 196             goto fail;
 197     } else if (pa_iochannel_is_hungup(c->io))
 198         goto fail;
 199
 200     if (pa_iochannel_is_writable(c->io)) {
 201         if (do_write(c) < 0)
 202             goto fail;
 203     }
 204
 205     return;
 206
 207 fail:
 208
 209     if (c->sink_input) {
 210         c->dead = 1;
 211
 212         pa_iochannel_free(c->io);
 213         c->io = NULL;
 214
 215         pa_memblockq_prebuf_disable(c->input_memblockq);
 216         pa_sink_notify(c->sink_input->sink);
 217     } else
 218         connection_free(c);
 219 }
 220
 221 /*** sink_input callbacks ***/
 222
 223 static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk) {
 224     struct connection*c;
 225     assert(i && i->userdata && chunk);
 226     c = i->userdata;
 227
 228     if (pa_memblockq_peek(c->input_memblockq, chunk) < 0) {
 229
 230         if (c->dead)
 231             connection_free(c);
 232
 233         return -1;
 234     }
 235
 236     return 0;
 237 }
 238
 239 static void sink_input_drop_cb(pa_sink_input *i, const pa_memchunk *chunk, size_t length) {
 240     struct connection*c = i->userdata;
 241     assert(i && c && length);
 242
 243     pa_memblockq_drop(c->input_memblockq, chunk, length);
 244
 245     /* do something */
 246     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 247     c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
 248 }
 249
 250 static void sink_input_kill_cb(pa_sink_input *i) {
 251     assert(i && i->userdata);
 252     connection_free((struct connection *) i->userdata);
 253 }
 254
 255
 256 static pa_usec_t sink_input_get_latency_cb(pa_sink_input *i) {
 257     struct connection*c = i->userdata;
 258     assert(i && c);
 259     return pa_bytes_to_usec(pa_memblockq_get_length(c->input_memblockq), &c->sink_input->sample_spec);
 260 }
 261
 262 /*** source_output callbacks ***/
 263
 264 static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
 265     struct connection *c = o->userdata;
 266     assert(o && c && chunk);
 267
 268     pa_memblockq_push(c->output_memblockq, chunk);
 269
 270     /* do something */
 271     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 272     c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
 273 }
 274
 275 static void source_output_kill_cb(pa_source_output *o) {
 276     assert(o && o->userdata);
 277     connection_free((struct connection *) o->userdata);
 278 }
 279
 280 static pa_usec_t source_output_get_latency_cb(pa_source_output *o) {
 281     struct connection*c = o->userdata;
 282     assert(o && c);
 283     return pa_bytes_to_usec(pa_memblockq_get_length(c->output_memblockq), &c->source_output->sample_spec);
 284 }
 285
 286 /*** client callbacks ***/
 287
 288 static void client_kill_cb(pa_client *c) {
 289     assert(c && c->userdata);
 290     connection_free((struct connection *) c->userdata);
 291 }
 292
 293 /*** pa_iochannel callbacks ***/
 294
 295 static void io_callback(pa_iochannel*io, void *userdata) {
 296     struct connection *c = userdata;
 297     assert(io && c && c->io == io);
 298
 299     do_work(c);
 300 }
 301
 302 /*** fixed callback ***/
 303
 304 static void defer_callback(pa_mainloop_api*a, pa_defer_event *e, void *userdata) {
 305     struct connection *c = userdata;
 306     assert(a && c && c->defer_event == e);
 307
 308     do_work(c);
 309 }
 310
 311 /*** socket_server callbacks ***/
 312
 313 static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata) {
 314     pa_protocol_simple *p = userdata;
 315     struct connection *c = NULL;
 316     char cname[256];
 317     assert(s && io && p);
 318
 319     if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) {
 320         pa_log("Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS);
 321         pa_iochannel_free(io);
 322         return;
 323     }
 324
 325     c = pa_xmalloc(sizeof(struct connection));
 326     c->io = io;
 327     c->sink_input = NULL;
 328     c->source_output = NULL;
 329     c->defer_event = NULL;
 330     c->input_memblockq = c->output_memblockq = NULL;
 331     c->protocol = p;
 332     c->playback.current_memblock = NULL;
 333     c->playback.memblock_index = 0;
 334     c->playback.fragment_size = 0;
 335     c->dead = 0;
 336
 337     pa_iochannel_socket_peer_to_string(io, cname, sizeof(cname));
 338     c->client = pa_client_new(p->core, __FILE__, cname);
 339     assert(c->client);
 340     c->client->owner = p->module;
 341     c->client->kill = client_kill_cb;
 342     c->client->userdata = c;
 343
 344     if (p->mode & PLAYBACK) {
 345         pa_sink_input_new_data data;
 346         size_t l;
 347
 348         pa_sink_input_new_data_init(&data);
 349         data.driver = __FILE__;
 350         data.name = c->client->name;
 351         pa_sink_input_new_data_set_sample_spec(&data, &p->sample_spec);
 352         data.module = p->module;
 353         data.client = c->client;
 354
 355         if (!(c->sink_input = pa_sink_input_new(p->core, &data, 0))) {
 356             pa_log("Failed to create sink input.");
 357             goto fail;
 358         }
 359
 360         c->sink_input->peek = sink_input_peek_cb;
 361         c->sink_input->drop = sink_input_drop_cb;
 362         c->sink_input->kill = sink_input_kill_cb;
 363         c->sink_input->get_latency = sink_input_get_latency_cb;
 364         c->sink_input->userdata = c;
 365
 366         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*PLAYBACK_BUFFER_SECONDS);
 367         c->input_memblockq = pa_memblockq_new(
 368                 0,
 369                 l,
 370                 0,
 371                 pa_frame_size(&p->sample_spec),
 372                 (size_t) -1,
 373                 l/PLAYBACK_BUFFER_FRAGMENTS,
 374                 NULL);
 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         pa_sink_notify(c->sink_input->sink);
 380     }
 381
 382     if (p->mode & RECORD) {
 383         pa_source_output_new_data data;
 384         size_t l;
 385
 386         pa_source_output_new_data_init(&data);
 387         data.driver = __FILE__;
 388         data.name = c->client->name;
 389         pa_source_output_new_data_set_sample_spec(&data, &p->sample_spec);
 390         data.module = p->module;
 391         data.client = c->client;
 392
 393         if (!(c->source_output = pa_source_output_new(p->core, &data, 0))) {
 394             pa_log("Failed to create source output.");
 395             goto fail;
 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         pa_iochannel_socket_set_sndbuf(io, l/RECORD_BUFFER_FRAGMENTS*2);
 412         pa_source_notify(c->source_output->source);
 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("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("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("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("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