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         pa_module_set_used(u->module, pa_sink_used_by(u->sink));
 148
 149         if (!u->memchunk.length)
 150             if (pa_sink_render(u->sink, 8192, &u->memchunk) < 0)
 151                 return 0;
 152
 153         assert(u->memchunk.memblock && u->memchunk.length);
 154
 155         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length)) < 0) {
 156             pa_log("write() failed: %s", pa_cstrerror(errno));
 157             return -1;
 158         }
 159
 160         u->memchunk.index += r;
 161         u->memchunk.length -= r;
 162
 163         if (u->memchunk.length <= 0) {
 164             pa_memblock_unref(u->memchunk.memblock);
 165             u->memchunk.memblock = NULL;
 166         }
 167     }
 168
 169     return 0;
 170 }
 171
 172 static int handle_response(struct userdata *u) {
 173     assert(u);
 174
 175     switch (u->state) {
 176         case STATE_AUTH:
 177             assert(u->read_length == sizeof(int32_t));
 178
 179             /* Process auth data */
 180             if (!*(int32_t*) u->read_data) {
 181                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 182                 return -1;
 183             }
 184
 185             /* Request latency data */
 186             assert(!u->write_data);
 187             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 188
 189             u->write_index = 0;
 190             u->state = STATE_LATENCY;
 191
 192             /* Space for next response */
 193             assert(u->read_length >= sizeof(int32_t));
 194             u->read_index = 0;
 195             u->read_length = sizeof(int32_t);
 196
 197             break;
 198
 199         case STATE_LATENCY: {
 200             int32_t *p;
 201             assert(u->read_length == sizeof(int32_t));
 202
 203             /* Process latency info */
 204             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 205             if (u->latency > 10000000) {
 206                 pa_log("WARNING! Invalid latency information received from server");
 207                 u->latency = 0;
 208             }
 209
 210             /* Create stream */
 211             assert(!u->write_data);
 212             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 213             *(p++) = ESD_PROTO_STREAM_PLAY;
 214             *(p++) = u->format;
 215             *(p++) = u->rate;
 216             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 217
 218             u->write_index = 0;
 219             u->state = STATE_RUNNING;
 220
 221             /* Don't read any further */
 222             pa_xfree(u->read_data);
 223             u->read_data = NULL;
 224             u->read_index = u->read_length = 0;
 225
 226             break;
 227         }
 228
 229         default:
 230             abort();
 231     }
 232
 233     return 0;
 234 }
 235
 236 static int do_read(struct userdata *u) {
 237     assert(u);
 238
 239     if (!pa_iochannel_is_readable(u->io))
 240         return 0;
 241
 242     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 243         ssize_t r;
 244
 245         if (!u->read_data)
 246             return 0;
 247
 248         assert(u->read_index < u->read_length);
 249
 250         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 251             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 252             cancel(u);
 253             return -1;
 254         }
 255
 256         u->read_index += r;
 257         assert(u->read_index <= u->read_length);
 258
 259         if (u->read_index == u->read_length)
 260             return handle_response(u);
 261     }
 262
 263     return 0;
 264 }
 265
 266 static void do_work(struct userdata *u) {
 267     assert(u);
 268
 269     u->core->mainloop->defer_enable(u->defer_event, 0);
 270
 271     if (do_read(u) < 0 || do_write(u) < 0)
 272         cancel(u);
 273 }
 274
 275 static void notify_cb(pa_sink*s) {
 276     struct userdata *u = s->userdata;
 277     assert(s && u);
 278
 279     if (pa_iochannel_is_writable(u->io))
 280         u->core->mainloop->defer_enable(u->defer_event, 1);
 281 }
 282
 283 static pa_usec_t get_latency_cb(pa_sink *s) {
 284     struct userdata *u = s->userdata;
 285     assert(s && u);
 286
 287     return
 288         u->latency +
 289         (u->memchunk.memblock ? pa_bytes_to_usec(u->memchunk.length, &s->sample_spec) : 0);
 290 }
 291
 292 static void defer_callback(PA_GCC_UNUSED pa_mainloop_api *m, PA_GCC_UNUSED pa_defer_event*e, void *userdata) {
 293     struct userdata *u = userdata;
 294     assert(u);
 295     do_work(u);
 296 }
 297
 298 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 299     struct userdata *u = userdata;
 300     assert(u);
 301     do_work(u);
 302 }
 303
 304 static void on_connection(PA_GCC_UNUSED pa_socket_client *c, pa_iochannel*io, void *userdata) {
 305     struct userdata *u = userdata;
 306
 307     pa_socket_client_unref(u->client);
 308     u->client = NULL;
 309
 310     if (!io) {
 311         pa_log("connection failed: %s", pa_cstrerror(errno));
 312         cancel(u);
 313         return;
 314     }
 315
 316     u->io = io;
 317     pa_iochannel_set_callback(u->io, io_callback, u);
 318 }
 319
 320 int pa__init(pa_core *c, pa_module*m) {
 321     struct userdata *u = NULL;
 322     const char *p;
 323     pa_sample_spec ss;
 324     pa_modargs *ma = NULL;
 325     char *t;
 326
 327     assert(c && m);
 328
 329     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 330         pa_log("failed to parse module arguments");
 331         goto fail;
 332     }
 333
 334     ss = c->default_sample_spec;
 335     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 336         pa_log("invalid sample format specification");
 337         goto fail;
 338     }
 339
 340     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 341         (ss.channels > 2)) {
 342         pa_log("esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 343         goto fail;
 344     }
 345
 346     u = pa_xmalloc0(sizeof(struct userdata));
 347     u->core = c;
 348     u->module = m;
 349     m->userdata = u;
 350     u->format =
 351         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 352         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 353     u->rate = ss.rate;
 354     u->sink = NULL;
 355     u->client = NULL;
 356     u->io = NULL;
 357     u->read_data = u->write_data = NULL;
 358     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 359     u->state = STATE_AUTH;
 360     u->latency = 0;
 361
 362     if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, NULL))) {
 363         pa_log("failed to create sink.");
 364         goto fail;
 365     }
 366
 367     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))) {
 368         pa_log("failed to connect to server.");
 369         goto fail;
 370     }
 371     pa_socket_client_set_callback(u->client, on_connection, u);
 372
 373     /* Prepare the initial request */
 374     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 375     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 376         pa_log("failed to load cookie");
 377         goto fail;
 378     }
 379     *(int32_t*) ((uint8_t*) u->write_data + ESD_KEY_LEN) = ESD_ENDIAN_KEY;
 380
 381     /* Reserve space for the response */
 382     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 383
 384     u->sink->notify = notify_cb;
 385     u->sink->get_latency = get_latency_cb;
 386     u->sink->userdata = u;
 387     pa_sink_set_owner(u->sink, m);
 388     pa_sink_set_description(u->sink, t = pa_sprintf_malloc("Esound sink '%s'", p));
 389     pa_xfree(t);
 390
 391     u->memchunk.memblock = NULL;
 392     u->memchunk.length = 0;
 393
 394     u->defer_event = c->mainloop->defer_new(c->mainloop, defer_callback, u);
 395     c->mainloop->defer_enable(u->defer_event, 0);
 396
 397
 398     pa_modargs_free(ma);
 399
 400     return 0;
 401
 402 fail:
 403     if (ma)
 404         pa_modargs_free(ma);
 405
 406     pa__done(c, m);
 407
 408     return -1;
 409 }
 410
 411 void pa__done(pa_core *c, pa_module*m) {
 412     struct userdata *u;
 413     assert(c && m);
 414
 415     if (!(u = m->userdata))
 416         return;
 417
 418     u->module = NULL;
 419     cancel(u);
 420
 421     if (u->memchunk.memblock)
 422         pa_memblock_unref(u->memchunk.memblock);
 423
 424     if (u->client)
 425         pa_socket_client_unref(u->client);
 426
 427     pa_xfree(u->read_data);
 428     pa_xfree(u->write_data);
 429
 430     pa_xfree(u);
 431 }
 432
 433
 434