code.delx.au - pulseaudio/blob - src/modules/module-esound-sink.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 <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 <pulse/xmalloc.h>
  39
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/iochannel.h>
  42 #include <pulsecore/sink.h>
  43 #include <pulsecore/module.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/modargs.h>
  46 #include <pulsecore/log.h>
  47 #include <pulsecore/socket-client.h>
  48 #include <pulsecore/esound.h>
  49 #include <pulsecore/authkey.h>
  50
  51 #include "module-esound-sink-symdef.h"
  52
  53 PA_MODULE_AUTHOR("Lennart Poettering")
  54 PA_MODULE_DESCRIPTION("ESOUND Sink")
  55 PA_MODULE_VERSION(PACKAGE_VERSION)
  56 PA_MODULE_USAGE("sink_name=<name for the sink> server=<address> cookie=<filename>  format=<sample format> channels=<number of channels> rate=<sample rate>")
  57
  58 #define DEFAULT_SINK_NAME "esound_output"
  59
  60 struct userdata {
  61     pa_core *core;
  62
  63     pa_sink *sink;
  64     pa_iochannel *io;
  65     pa_socket_client *client;
  66
  67     pa_defer_event *defer_event;
  68
  69     pa_memchunk memchunk;
  70     pa_module *module;
  71
  72     void *write_data;
  73     size_t write_length, write_index;
  74
  75     void *read_data;
  76     size_t read_length, read_index;
  77
  78     enum { STATE_AUTH, STATE_LATENCY, STATE_RUNNING, STATE_DEAD } state;
  79
  80     pa_usec_t latency;
  81
  82     esd_format_t format;
  83     int32_t rate;
  84 };
  85
  86 static const char* const valid_modargs[] = {
  87     "server",
  88     "cookie",
  89     "rate",
  90     "format",
  91     "channels",
  92     "sink_name",
  93     NULL
  94 };
  95
  96 static void cancel(struct userdata *u) {
  97     assert(u);
  98
  99     u->state = STATE_DEAD;
 100
 101     if (u->io) {
 102         pa_iochannel_free(u->io);
 103         u->io = NULL;
 104     }
 105
 106     if (u->defer_event) {
 107         u->core->mainloop->defer_free(u->defer_event);
 108         u->defer_event = NULL;
 109     }
 110
 111     if (u->sink) {
 112         pa_sink_disconnect(u->sink);
 113         pa_sink_unref(u->sink);
 114         u->sink = NULL;
 115     }
 116
 117     if (u->module) {
 118         pa_module_unload_request(u->module);
 119         u->module = NULL;
 120     }
 121 }
 122
 123 static int do_write(struct userdata *u) {
 124     ssize_t r;
 125     assert(u);
 126
 127     if (!pa_iochannel_is_writable(u->io))
 128         return 0;
 129
 130     if (u->write_data) {
 131         assert(u->write_index < u->write_length);
 132
 133         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->write_data + u->write_index, u->write_length - u->write_index)) <= 0) {
 134             pa_log("write() failed: %s", pa_cstrerror(errno));
 135             return -1;
 136         }
 137
 138         u->write_index += r;
 139         assert(u->write_index <= u->write_length);
 140
 141         if (u->write_index == u->write_length) {
 142             free(u->write_data);
 143             u->write_data = NULL;
 144             u->write_index = u->write_length = 0;
 145         }
 146     } else if (u->state == STATE_RUNNING) {
 147         void *p;
 148
 149         pa_module_set_used(u->module, pa_sink_used_by(u->sink));
 150
 151         if (!u->memchunk.length)
 152             if (pa_sink_render(u->sink, 8192, &u->memchunk) < 0)
 153                 return 0;
 154
 155         assert(u->memchunk.memblock);
 156         assert(u->memchunk.length);
 157
 158         p = pa_memblock_acquire(u->memchunk.memblock);
 159
 160         if ((r = pa_iochannel_write(u->io, (uint8_t*) p + u->memchunk.index, u->memchunk.length)) < 0) {
 161             pa_memblock_release(u->memchunk.memblock);
 162             pa_log("write() failed: %s", pa_cstrerror(errno));
 163             return -1;
 164         }
 165         pa_memblock_release(u->memchunk.memblock);
 166
 167         u->memchunk.index += r;
 168         u->memchunk.length -= r;
 169
 170         if (u->memchunk.length <= 0) {
 171             pa_memblock_unref(u->memchunk.memblock);
 172             u->memchunk.memblock = NULL;
 173         }
 174     }
 175
 176     return 0;
 177 }
 178
 179 static int handle_response(struct userdata *u) {
 180     assert(u);
 181
 182     switch (u->state) {
 183         case STATE_AUTH:
 184             assert(u->read_length == sizeof(int32_t));
 185
 186             /* Process auth data */
 187             if (!*(int32_t*) u->read_data) {
 188                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 189                 return -1;
 190             }
 191
 192             /* Request latency data */
 193             assert(!u->write_data);
 194             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 195
 196             u->write_index = 0;
 197             u->state = STATE_LATENCY;
 198
 199             /* Space for next response */
 200             assert(u->read_length >= sizeof(int32_t));
 201             u->read_index = 0;
 202             u->read_length = sizeof(int32_t);
 203
 204             break;
 205
 206         case STATE_LATENCY: {
 207             int32_t *p;
 208             assert(u->read_length == sizeof(int32_t));
 209
 210             /* Process latency info */
 211             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 212             if (u->latency > 10000000) {
 213                 pa_log("WARNING! Invalid latency information received from server");
 214                 u->latency = 0;
 215             }
 216
 217             /* Create stream */
 218             assert(!u->write_data);
 219             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 220             *(p++) = ESD_PROTO_STREAM_PLAY;
 221             *(p++) = u->format;
 222             *(p++) = u->rate;
 223             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 224
 225             u->write_index = 0;
 226             u->state = STATE_RUNNING;
 227
 228             /* Don't read any further */
 229             pa_xfree(u->read_data);
 230             u->read_data = NULL;
 231             u->read_index = u->read_length = 0;
 232
 233             break;
 234         }
 235
 236         default:
 237             abort();
 238     }
 239
 240     return 0;
 241 }
 242
 243 static int do_read(struct userdata *u) {
 244     assert(u);
 245
 246     if (!pa_iochannel_is_readable(u->io))
 247         return 0;
 248
 249     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 250         ssize_t r;
 251
 252         if (!u->read_data)
 253             return 0;
 254
 255         assert(u->read_index < u->read_length);
 256
 257         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 258             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 259             cancel(u);
 260             return -1;
 261         }
 262
 263         u->read_index += r;
 264         assert(u->read_index <= u->read_length);
 265
 266         if (u->read_index == u->read_length)
 267             return handle_response(u);
 268     }
 269
 270     return 0;
 271 }
 272
 273 static void do_work(struct userdata *u) {
 274     assert(u);
 275
 276     u->core->mainloop->defer_enable(u->defer_event, 0);
 277
 278     if (do_read(u) < 0 || do_write(u) < 0)
 279         cancel(u);
 280 }
 281
 282 static void notify_cb(pa_sink*s) {
 283     struct userdata *u = s->userdata;
 284     assert(s && u);
 285
 286     if (pa_iochannel_is_writable(u->io))
 287         u->core->mainloop->defer_enable(u->defer_event, 1);
 288 }
 289
 290 static pa_usec_t get_latency_cb(pa_sink *s) {
 291     struct userdata *u = s->userdata;
 292     assert(s && u);
 293
 294     return
 295         u->latency +
 296         (u->memchunk.memblock ? pa_bytes_to_usec(u->memchunk.length, &s->sample_spec) : 0);
 297 }
 298
 299 static void defer_callback(PA_GCC_UNUSED pa_mainloop_api *m, PA_GCC_UNUSED pa_defer_event*e, void *userdata) {
 300     struct userdata *u = userdata;
 301     assert(u);
 302     do_work(u);
 303 }
 304
 305 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 306     struct userdata *u = userdata;
 307     assert(u);
 308     do_work(u);
 309 }
 310
 311 static void on_connection(PA_GCC_UNUSED pa_socket_client *c, pa_iochannel*io, void *userdata) {
 312     struct userdata *u = userdata;
 313
 314     pa_socket_client_unref(u->client);
 315     u->client = NULL;
 316
 317     if (!io) {
 318         pa_log("connection failed: %s", pa_cstrerror(errno));
 319         cancel(u);
 320         return;
 321     }
 322
 323     u->io = io;
 324     pa_iochannel_set_callback(u->io, io_callback, u);
 325 }
 326
 327 int pa__init(pa_core *c, pa_module*m) {
 328     struct userdata *u = NULL;
 329     const char *p;
 330     pa_sample_spec ss;
 331     pa_modargs *ma = NULL;
 332     char *t;
 333
 334     assert(c && m);
 335
 336     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 337         pa_log("failed to parse module arguments");
 338         goto fail;
 339     }
 340
 341     ss = c->default_sample_spec;
 342     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 343         pa_log("invalid sample format specification");
 344         goto fail;
 345     }
 346
 347     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 348         (ss.channels > 2)) {
 349         pa_log("esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 350         goto fail;
 351     }
 352
 353     u = pa_xmalloc0(sizeof(struct userdata));
 354     u->core = c;
 355     u->module = m;
 356     m->userdata = u;
 357     u->format =
 358         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 359         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 360     u->rate = ss.rate;
 361     u->sink = NULL;
 362     u->client = NULL;
 363     u->io = NULL;
 364     u->read_data = u->write_data = NULL;
 365     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 366     u->state = STATE_AUTH;
 367     u->latency = 0;
 368
 369     if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, NULL))) {
 370         pa_log("failed to create sink.");
 371         goto fail;
 372     }
 373
 374     if (!(u->client = pa_socket_client_new_string(u->core->mainloop, p = pa_modargs_get_value(ma, "server", ESD_UNIX_SOCKET_NAME), ESD_DEFAULT_PORT))) {
 375         pa_log("failed to connect to server.");
 376         goto fail;
 377     }
 378     pa_socket_client_set_callback(u->client, on_connection, u);
 379
 380     /* Prepare the initial request */
 381     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 382     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 383         pa_log("failed to load cookie");
 384         goto fail;
 385     }
 386     *(int32_t*) ((uint8_t*) u->write_data + ESD_KEY_LEN) = ESD_ENDIAN_KEY;
 387
 388     /* Reserve space for the response */
 389     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 390
 391     u->sink->notify = notify_cb;
 392     u->sink->get_latency = get_latency_cb;
 393     u->sink->userdata = u;
 394     pa_sink_set_owner(u->sink, m);
 395     pa_sink_set_description(u->sink, t = pa_sprintf_malloc("Esound sink '%s'", p));
 396     pa_xfree(t);
 397
 398     u->memchunk.memblock = NULL;
 399     u->memchunk.length = 0;
 400
 401     u->defer_event = c->mainloop->defer_new(c->mainloop, defer_callback, u);
 402     c->mainloop->defer_enable(u->defer_event, 0);
 403
 404
 405     pa_modargs_free(ma);
 406
 407     return 0;
 408
 409 fail:
 410     if (ma)
 411         pa_modargs_free(ma);
 412
 413     pa__done(c, m);
 414
 415     return -1;
 416 }
 417
 418 void pa__done(pa_core *c, pa_module*m) {
 419     struct userdata *u;
 420     assert(c && m);
 421
 422     if (!(u = m->userdata))
 423         return;
 424
 425     u->module = NULL;
 426     cancel(u);
 427
 428     if (u->memchunk.memblock)
 429         pa_memblock_unref(u->memchunk.memblock);
 430
 431     if (u->client)
 432         pa_socket_client_unref(u->client);
 433
 434     pa_xfree(u->read_data);
 435     pa_xfree(u->write_data);
 436
 437     pa_xfree(u);
 438 }
 439
 440
 441