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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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   polypaudio 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 polypaudio; 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 <stdlib.h>
  27 #include <sys/stat.h>
  28 #include <stdio.h>
  29 #include <assert.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34 #include <limits.h>
  35
  36 #include <polyp/xmalloc.h>
  37
  38 #include <polypcore/core-error.h>
  39 #include <polypcore/iochannel.h>
  40 #include <polypcore/sink.h>
  41 #include <polypcore/module.h>
  42 #include <polypcore/core-util.h>
  43 #include <polypcore/modargs.h>
  44 #include <polypcore/log.h>
  45 #include <polypcore/socket-client.h>
  46 #include <polypcore/esound.h>
  47 #include <polypcore/authkey.h>
  48
  49 #include "module-esound-sink-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering")
  52 PA_MODULE_DESCRIPTION("ESOUND Sink")
  53 PA_MODULE_VERSION(PACKAGE_VERSION)
  54 PA_MODULE_USAGE("sink_name=<name for the sink> server=<address> cookie=<filename>  format=<sample format> channels=<number of channels> rate=<sample rate>")
  55
  56 #define DEFAULT_SINK_NAME "esound_output"
  57
  58 struct userdata {
  59     pa_core *core;
  60
  61     pa_sink *sink;
  62     pa_iochannel *io;
  63     pa_socket_client *client;
  64
  65     pa_defer_event *defer_event;
  66
  67     pa_memchunk memchunk;
  68     pa_module *module;
  69
  70     void *write_data;
  71     size_t write_length, write_index;
  72
  73     void *read_data;
  74     size_t read_length, read_index;
  75
  76     enum { STATE_AUTH, STATE_LATENCY, STATE_RUNNING, STATE_DEAD } state;
  77
  78     pa_usec_t latency;
  79
  80     esd_format_t format;
  81     int32_t rate;
  82 };
  83
  84 static const char* const valid_modargs[] = {
  85     "server",
  86     "cookie",
  87     "rate",
  88     "format",
  89     "channels",
  90     "sink_name",
  91     NULL
  92 };
  93
  94 static void cancel(struct userdata *u) {
  95     assert(u);
  96
  97     u->state = STATE_DEAD;
  98
  99     if (u->io) {
 100         pa_iochannel_free(u->io);
 101         u->io = NULL;
 102     }
 103
 104     if (u->defer_event) {
 105         u->core->mainloop->defer_free(u->defer_event);
 106         u->defer_event = NULL;
 107     }
 108
 109     if (u->sink) {
 110         pa_sink_disconnect(u->sink);
 111         pa_sink_unref(u->sink);
 112         u->sink = NULL;
 113     }
 114
 115     if (u->module) {
 116         pa_module_unload_request(u->module);
 117         u->module = NULL;
 118     }
 119 }
 120
 121 static int do_write(struct userdata *u) {
 122     ssize_t r;
 123     assert(u);
 124
 125     if (!pa_iochannel_is_writable(u->io))
 126         return 0;
 127
 128     if (u->write_data) {
 129         assert(u->write_index < u->write_length);
 130
 131         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->write_data + u->write_index, u->write_length - u->write_index)) <= 0) {
 132             pa_log(__FILE__": write() failed: %s", pa_cstrerror(errno));
 133             return -1;
 134         }
 135
 136         u->write_index += r;
 137         assert(u->write_index <= u->write_length);
 138
 139         if (u->write_index == u->write_length) {
 140             free(u->write_data);
 141             u->write_data = NULL;
 142             u->write_index = u->write_length = 0;
 143         }
 144     } else if (u->state == STATE_RUNNING) {
 145         pa_module_set_used(u->module, pa_idxset_size(u->sink->inputs) + pa_idxset_size(u->sink->monitor_source->outputs));
 146
 147         if (!u->memchunk.length)
 148             if (pa_sink_render(u->sink, 8192, &u->memchunk) < 0)
 149                 return 0;
 150
 151         assert(u->memchunk.memblock && u->memchunk.length);
 152
 153         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length)) < 0) {
 154             pa_log(__FILE__": write() failed: %s", pa_cstrerror(errno));
 155             return -1;
 156         }
 157
 158         u->memchunk.index += r;
 159         u->memchunk.length -= r;
 160
 161         if (u->memchunk.length <= 0) {
 162             pa_memblock_unref(u->memchunk.memblock);
 163             u->memchunk.memblock = NULL;
 164         }
 165     }
 166
 167     return 0;
 168 }
 169
 170 static int handle_response(struct userdata *u) {
 171     assert(u);
 172
 173     switch (u->state) {
 174         case STATE_AUTH:
 175             assert(u->read_length == sizeof(int32_t));
 176
 177             /* Process auth data */
 178             if (!*(int32_t*) u->read_data) {
 179                 pa_log(__FILE__": Authentication failed: %s", pa_cstrerror(errno));
 180                 return -1;
 181             }
 182
 183             /* Request latency data */
 184             assert(!u->write_data);
 185             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 186
 187             u->write_index = 0;
 188             u->state = STATE_LATENCY;
 189
 190             /* Space for next response */
 191             assert(u->read_length >= sizeof(int32_t));
 192             u->read_index = 0;
 193             u->read_length = sizeof(int32_t);
 194
 195             break;
 196
 197         case STATE_LATENCY: {
 198             int32_t *p;
 199             assert(u->read_length == sizeof(int32_t));
 200
 201             /* Process latency info */
 202             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 203             if (u->latency > 10000000) {
 204                 pa_log(__FILE__": WARNING! Invalid latency information received from server");
 205                 u->latency = 0;
 206             }
 207
 208             /* Create stream */
 209             assert(!u->write_data);
 210             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 211             *(p++) = ESD_PROTO_STREAM_PLAY;
 212             *(p++) = u->format;
 213             *(p++) = u->rate;
 214             pa_strlcpy((char*) p, "Polypaudio Tunnel", ESD_NAME_MAX);
 215
 216             u->write_index = 0;
 217             u->state = STATE_RUNNING;
 218
 219             /* Don't read any further */
 220             pa_xfree(u->read_data);
 221             u->read_data = NULL;
 222             u->read_index = u->read_length = 0;
 223
 224             break;
 225         }
 226
 227         default:
 228             abort();
 229     }
 230
 231     return 0;
 232 }
 233
 234 static int do_read(struct userdata *u) {
 235     assert(u);
 236
 237     if (!pa_iochannel_is_readable(u->io))
 238         return 0;
 239
 240     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 241         ssize_t r;
 242
 243         if (!u->read_data)
 244             return 0;
 245
 246         assert(u->read_index < u->read_length);
 247
 248         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 249             pa_log(__FILE__": read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 250             cancel(u);
 251             return -1;
 252         }
 253
 254         u->read_index += r;
 255         assert(u->read_index <= u->read_length);
 256
 257         if (u->read_index == u->read_length)
 258             return handle_response(u);
 259     }
 260
 261     return 0;
 262 }
 263
 264 static void do_work(struct userdata *u) {
 265     assert(u);
 266
 267     u->core->mainloop->defer_enable(u->defer_event, 0);
 268
 269     if (do_read(u) < 0 || do_write(u) < 0)
 270         cancel(u);
 271 }
 272
 273 static void notify_cb(pa_sink*s) {
 274     struct userdata *u = s->userdata;
 275     assert(s && u);
 276
 277     if (pa_iochannel_is_writable(u->io))
 278         u->core->mainloop->defer_enable(u->defer_event, 1);
 279 }
 280
 281 static pa_usec_t get_latency_cb(pa_sink *s) {
 282     struct userdata *u = s->userdata;
 283     assert(s && u);
 284
 285     return
 286         u->latency +
 287         (u->memchunk.memblock ? pa_bytes_to_usec(u->memchunk.length, &s->sample_spec) : 0);
 288 }
 289
 290 static void defer_callback(PA_GCC_UNUSED pa_mainloop_api *m, PA_GCC_UNUSED pa_defer_event*e, void *userdata) {
 291     struct userdata *u = userdata;
 292     assert(u);
 293     do_work(u);
 294 }
 295
 296 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 297     struct userdata *u = userdata;
 298     assert(u);
 299     do_work(u);
 300 }
 301
 302 static void on_connection(PA_GCC_UNUSED pa_socket_client *c, pa_iochannel*io, void *userdata) {
 303     struct userdata *u = userdata;
 304
 305     pa_socket_client_unref(u->client);
 306     u->client = NULL;
 307
 308     if (!io) {
 309         pa_log(__FILE__": connection failed: %s", pa_cstrerror(errno));
 310         cancel(u);
 311         return;
 312     }
 313
 314     u->io = io;
 315     pa_iochannel_set_callback(u->io, io_callback, u);
 316 }
 317
 318 int pa__init(pa_core *c, pa_module*m) {
 319     struct userdata *u = NULL;
 320     const char *p;
 321     pa_sample_spec ss;
 322     pa_modargs *ma = NULL;
 323     assert(c && m);
 324
 325     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 326         pa_log(__FILE__": failed to parse module arguments");
 327         goto fail;
 328     }
 329
 330     ss = c->default_sample_spec;
 331     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 332         pa_log(__FILE__": invalid sample format specification");
 333         goto fail;
 334     }
 335
 336     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 337         (ss.channels > 2)) {
 338         pa_log(__FILE__": esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 339         goto fail;
 340     }
 341
 342     u = pa_xmalloc0(sizeof(struct userdata));
 343     u->core = c;
 344     u->module = m;
 345     m->userdata = u;
 346     u->format =
 347         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 348         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 349     u->rate = ss.rate;
 350     u->sink = NULL;
 351     u->client = NULL;
 352     u->io = NULL;
 353     u->read_data = u->write_data = NULL;
 354     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 355     u->state = STATE_AUTH;
 356     u->latency = 0;
 357
 358     if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, NULL))) {
 359         pa_log(__FILE__": failed to create sink.");
 360         goto fail;
 361     }
 362
 363     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))) {
 364         pa_log(__FILE__": failed to connect to server.");
 365         goto fail;
 366     }
 367     pa_socket_client_set_callback(u->client, on_connection, u);
 368
 369     /* Prepare the initial request */
 370     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 371     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 372         pa_log(__FILE__": failed to load cookie");
 373         goto fail;
 374     }
 375     *(int32_t*) ((uint8_t*) u->write_data + ESD_KEY_LEN) = ESD_ENDIAN_KEY;
 376
 377     /* Reserve space for the response */
 378     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 379
 380     u->sink->notify = notify_cb;
 381     u->sink->get_latency = get_latency_cb;
 382     u->sink->userdata = u;
 383     pa_sink_set_owner(u->sink, m);
 384     u->sink->description = pa_sprintf_malloc("Esound sink '%s'", p);
 385
 386     u->memchunk.memblock = NULL;
 387     u->memchunk.length = 0;
 388
 389     u->defer_event = c->mainloop->defer_new(c->mainloop, defer_callback, u);
 390     c->mainloop->defer_enable(u->defer_event, 0);
 391
 392
 393     pa_modargs_free(ma);
 394
 395     return 0;
 396
 397 fail:
 398     if (ma)
 399         pa_modargs_free(ma);
 400
 401     pa__done(c, m);
 402
 403     return -1;
 404 }
 405
 406 void pa__done(pa_core *c, pa_module*m) {
 407     struct userdata *u;
 408     assert(c && m);
 409
 410     if (!(u = m->userdata))
 411         return;
 412
 413     u->module = NULL;
 414     cancel(u);
 415
 416     if (u->memchunk.memblock)
 417         pa_memblock_unref(u->memchunk.memblock);
 418
 419     if (u->client)
 420         pa_socket_client_unref(u->client);
 421
 422     pa_xfree(u->read_data);
 423     pa_xfree(u->write_data);
 424
 425     pa_xfree(u);
 426 }
 427
 428
 429