code.delx.au - pulseaudio/blob - polyp/pstream.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 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 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 <stdio.h>
  27 #include <stdlib.h>
  28 #include <assert.h>
  29 #include <unistd.h>
  30 #include <netinet/in.h>
  31
  32 #include "pstream.h"
  33 #include "queue.h"
  34 #include "xmalloc.h"
  35 #include "log.h"
  36
  37 enum pa_pstream_descriptor_index {
  38     PA_PSTREAM_DESCRIPTOR_LENGTH,
  39     PA_PSTREAM_DESCRIPTOR_CHANNEL,
  40     PA_PSTREAM_DESCRIPTOR_DELTA,
  41     PA_PSTREAM_DESCRIPTOR_MAX
  42 };
  43
  44 typedef uint32_t pa_pstream_descriptor[PA_PSTREAM_DESCRIPTOR_MAX];
  45
  46 #define PA_PSTREAM_DESCRIPTOR_SIZE (PA_PSTREAM_DESCRIPTOR_MAX*sizeof(uint32_t))
  47 #define FRAME_SIZE_MAX (1024*500) /* half a megabyte */
  48
  49 struct item_info {
  50     enum { PA_PSTREAM_ITEM_PACKET, PA_PSTREAM_ITEM_MEMBLOCK } type;
  51
  52     /* memblock info */
  53     struct pa_memchunk chunk;
  54     uint32_t channel;
  55     uint32_t delta;
  56
  57     /* packet info */
  58     struct pa_packet *packet;
  59 };
  60
  61 struct pa_pstream {
  62     int ref;
  63
  64     struct pa_mainloop_api *mainloop;
  65     struct pa_defer_event *defer_event;
  66     struct pa_iochannel *io;
  67     struct pa_queue *send_queue;
  68
  69     int dead;
  70     void (*die_callback) (struct pa_pstream *p, void *userdata);
  71     void *die_callback_userdata;
  72
  73     struct {
  74         struct item_info* current;
  75         pa_pstream_descriptor descriptor;
  76         void *data;
  77         size_t index;
  78     } write;
  79
  80     struct {
  81         struct pa_memblock *memblock;
  82         struct pa_packet *packet;
  83         pa_pstream_descriptor descriptor;
  84         void *data;
  85         size_t index;
  86     } read;
  87
  88     void (*recieve_packet_callback) (struct pa_pstream *p, struct pa_packet *packet, void *userdata);
  89     void *recieve_packet_callback_userdata;
  90
  91     void (*recieve_memblock_callback) (struct pa_pstream *p, uint32_t channel, uint32_t delta, const struct pa_memchunk *chunk, void *userdata);
  92     void *recieve_memblock_callback_userdata;
  93
  94     void (*drain_callback)(struct pa_pstream *p, void *userdata);
  95     void *drain_userdata;
  96
  97     struct pa_memblock_stat *memblock_stat;
  98 };
  99
 100 static void do_write(struct pa_pstream *p);
 101 static void do_read(struct pa_pstream *p);
 102
 103 static void do_something(struct pa_pstream *p) {
 104     assert(p);
 105
 106     if (p->dead)
 107         return;
 108
 109     p->mainloop->defer_enable(p->defer_event, 0);
 110
 111     pa_pstream_ref(p);
 112
 113     if (!p->dead && pa_iochannel_is_hungup(p->io)) {
 114         p->dead = 1;
 115         if (p->die_callback)
 116             p->die_callback(p, p->die_callback_userdata);
 117     }
 118
 119     if (!p->dead && pa_iochannel_is_writable(p->io))
 120         do_write(p);
 121
 122     if (!p->dead && pa_iochannel_is_readable(p->io))
 123         do_read(p);
 124
 125     pa_pstream_unref(p);
 126 }
 127
 128 static void io_callback(struct pa_iochannel*io, void *userdata) {
 129     struct pa_pstream *p = userdata;
 130     assert(p && p->io == io);
 131     do_something(p);
 132 }
 133
 134 static void defer_callback(struct pa_mainloop_api *m, struct pa_defer_event *e, void*userdata) {
 135     struct pa_pstream *p = userdata;
 136     assert(p && p->defer_event == e && p->mainloop == m);
 137     do_something(p);
 138 }
 139
 140 struct pa_pstream *pa_pstream_new(struct pa_mainloop_api *m, struct pa_iochannel *io, struct pa_memblock_stat *s) {
 141     struct pa_pstream *p;
 142     assert(io);
 143
 144     p = pa_xmalloc(sizeof(struct pa_pstream));
 145     p->ref = 1;
 146     p->io = io;
 147     pa_iochannel_set_callback(io, io_callback, p);
 148
 149     p->dead = 0;
 150     p->die_callback = NULL;
 151     p->die_callback_userdata = NULL;
 152
 153     p->mainloop = m;
 154     p->defer_event = m->defer_new(m, defer_callback, p);
 155     m->defer_enable(p->defer_event, 0);
 156
 157     p->send_queue = pa_queue_new();
 158     assert(p->send_queue);
 159
 160     p->write.current = NULL;
 161     p->write.index = 0;
 162
 163     p->read.memblock = NULL;
 164     p->read.packet = NULL;
 165     p->read.index = 0;
 166
 167     p->recieve_packet_callback = NULL;
 168     p->recieve_packet_callback_userdata = NULL;
 169
 170     p->recieve_memblock_callback = NULL;
 171     p->recieve_memblock_callback_userdata = NULL;
 172
 173     p->drain_callback = NULL;
 174     p->drain_userdata = NULL;
 175
 176     p->memblock_stat = s;
 177
 178     pa_iochannel_socket_set_rcvbuf(io, 1024*8);
 179     pa_iochannel_socket_set_sndbuf(io, 1024*8);
 180
 181     return p;
 182 }
 183
 184 static void item_free(void *item, void *p) {
 185     struct item_info *i = item;
 186     assert(i);
 187
 188     if (i->type == PA_PSTREAM_ITEM_MEMBLOCK) {
 189         assert(i->chunk.memblock);
 190         pa_memblock_unref(i->chunk.memblock);
 191     } else {
 192         assert(i->type == PA_PSTREAM_ITEM_PACKET);
 193         assert(i->packet);
 194         pa_packet_unref(i->packet);
 195     }
 196
 197     pa_xfree(i);
 198 }
 199
 200 static void pstream_free(struct pa_pstream *p) {
 201     assert(p);
 202
 203     pa_pstream_close(p);
 204
 205     pa_queue_free(p->send_queue, item_free, NULL);
 206
 207     if (p->write.current)
 208         item_free(p->write.current, NULL);
 209
 210     if (p->read.memblock)
 211         pa_memblock_unref(p->read.memblock);
 212
 213     if (p->read.packet)
 214         pa_packet_unref(p->read.packet);
 215
 216     pa_xfree(p);
 217 }
 218
 219 void pa_pstream_send_packet(struct pa_pstream*p, struct pa_packet *packet) {
 220     struct item_info *i;
 221     assert(p && packet && p->ref >= 1);
 222
 223     if (p->dead)
 224         return;
 225
 226 /*     pa_log(__FILE__": push-packet %p\n", packet); */
 227
 228     i = pa_xmalloc(sizeof(struct item_info));
 229     i->type = PA_PSTREAM_ITEM_PACKET;
 230     i->packet = pa_packet_ref(packet);
 231
 232     pa_queue_push(p->send_queue, i);
 233     p->mainloop->defer_enable(p->defer_event, 1);
 234 }
 235
 236 void pa_pstream_send_memblock(struct pa_pstream*p, uint32_t channel, uint32_t delta, const struct pa_memchunk *chunk) {
 237     struct item_info *i;
 238     assert(p && channel != (uint32_t) -1 && chunk && p->ref >= 1);
 239
 240     if (p->dead)
 241         return;
 242
 243 /*     pa_log(__FILE__": push-memblock %p\n", chunk); */
 244
 245     i = pa_xmalloc(sizeof(struct item_info));
 246     i->type = PA_PSTREAM_ITEM_MEMBLOCK;
 247     i->chunk = *chunk;
 248     i->channel = channel;
 249     i->delta = delta;
 250
 251     pa_memblock_ref(i->chunk.memblock);
 252
 253     pa_queue_push(p->send_queue, i);
 254     p->mainloop->defer_enable(p->defer_event, 1);
 255 }
 256
 257 void pa_pstream_set_recieve_packet_callback(struct pa_pstream *p, void (*callback) (struct pa_pstream *p, struct pa_packet *packet, void *userdata), void *userdata) {
 258     assert(p && callback);
 259
 260     p->recieve_packet_callback = callback;
 261     p->recieve_packet_callback_userdata = userdata;
 262 }
 263
 264 void pa_pstream_set_recieve_memblock_callback(struct pa_pstream *p, void (*callback) (struct pa_pstream *p, uint32_t channel, uint32_t delta, const struct pa_memchunk *chunk, void *userdata), void *userdata) {
 265     assert(p && callback);
 266
 267     p->recieve_memblock_callback = callback;
 268     p->recieve_memblock_callback_userdata = userdata;
 269 }
 270
 271 static void prepare_next_write_item(struct pa_pstream *p) {
 272     assert(p);
 273
 274     if (!(p->write.current = pa_queue_pop(p->send_queue)))
 275         return;
 276
 277     p->write.index = 0;
 278
 279     if (p->write.current->type == PA_PSTREAM_ITEM_PACKET) {
 280         /*pa_log(__FILE__": pop-packet %p\n", p->write.current->packet);*/
 281
 282         assert(p->write.current->packet);
 283         p->write.data = p->write.current->packet->data;
 284         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH] = htonl(p->write.current->packet->length);
 285         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL] = htonl((uint32_t) -1);
 286         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_DELTA] = 0;
 287     } else {
 288         assert(p->write.current->type == PA_PSTREAM_ITEM_MEMBLOCK && p->write.current->chunk.memblock);
 289         p->write.data = (uint8_t*) p->write.current->chunk.memblock->data + p->write.current->chunk.index;
 290         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH] = htonl(p->write.current->chunk.length);
 291         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL] = htonl(p->write.current->channel);
 292         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_DELTA] = htonl(p->write.current->delta);
 293     }
 294 }
 295
 296 static void do_write(struct pa_pstream *p) {
 297     void *d;
 298     size_t l;
 299     ssize_t r;
 300     assert(p);
 301
 302     if (!p->write.current)
 303         prepare_next_write_item(p);
 304
 305     if (!p->write.current)
 306         return;
 307
 308     assert(p->write.data);
 309
 310     if (p->write.index < PA_PSTREAM_DESCRIPTOR_SIZE) {
 311         d = (uint8_t*) p->write.descriptor + p->write.index;
 312         l = PA_PSTREAM_DESCRIPTOR_SIZE - p->write.index;
 313     } else {
 314         d = (uint8_t*) p->write.data + p->write.index - PA_PSTREAM_DESCRIPTOR_SIZE;
 315         l = ntohl(p->write.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]) - (p->write.index - PA_PSTREAM_DESCRIPTOR_SIZE);
 316     }
 317
 318     if ((r = pa_iochannel_write(p->io, d, l)) < 0)
 319         goto die;
 320
 321     p->write.index += r;
 322
 323     if (p->write.index >= PA_PSTREAM_DESCRIPTOR_SIZE+ntohl(p->write.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH])) {
 324         assert(p->write.current);
 325         item_free(p->write.current, (void *) 1);
 326         p->write.current = NULL;
 327
 328         if (p->drain_callback && !pa_pstream_is_pending(p))
 329             p->drain_callback(p, p->drain_userdata);
 330     }
 331
 332     return;
 333
 334 die:
 335     p->dead = 1;
 336     if (p->die_callback)
 337         p->die_callback(p, p->die_callback_userdata);
 338 }
 339
 340 static void do_read(struct pa_pstream *p) {
 341     void *d;
 342     size_t l;
 343     ssize_t r;
 344     assert(p);
 345
 346     if (p->read.index < PA_PSTREAM_DESCRIPTOR_SIZE) {
 347         d = (uint8_t*) p->read.descriptor + p->read.index;
 348         l = PA_PSTREAM_DESCRIPTOR_SIZE - p->read.index;
 349     } else {
 350         assert(p->read.data);
 351         d = (uint8_t*) p->read.data + p->read.index - PA_PSTREAM_DESCRIPTOR_SIZE;
 352         l = ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]) - (p->read.index - PA_PSTREAM_DESCRIPTOR_SIZE);
 353     }
 354
 355     if ((r = pa_iochannel_read(p->io, d, l)) <= 0)
 356         goto die;
 357
 358     p->read.index += r;
 359
 360     if (p->read.index == PA_PSTREAM_DESCRIPTOR_SIZE) {
 361         /* Reading of frame descriptor complete */
 362
 363         /* Frame size too large */
 364         if (ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]) > FRAME_SIZE_MAX) {
 365             pa_log(__FILE__": Frame size too large\n");
 366             goto die;
 367         }
 368
 369         assert(!p->read.packet && !p->read.memblock);
 370
 371         if (ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL]) == (uint32_t) -1) {
 372             /* Frame is a packet frame */
 373             p->read.packet = pa_packet_new(ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]));
 374             assert(p->read.packet);
 375             p->read.data = p->read.packet->data;
 376         } else {
 377             /* Frame is a memblock frame */
 378             p->read.memblock = pa_memblock_new(ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]), p->memblock_stat);
 379             assert(p->read.memblock);
 380             p->read.data = p->read.memblock->data;
 381         }
 382
 383     } else if (p->read.index > PA_PSTREAM_DESCRIPTOR_SIZE) {
 384         /* Frame payload available */
 385
 386         if (p->read.memblock && p->recieve_memblock_callback) { /* Is this memblock data? Than pass it to the user */
 387             size_t l;
 388
 389             l = (p->read.index - r) < PA_PSTREAM_DESCRIPTOR_SIZE ? p->read.index - PA_PSTREAM_DESCRIPTOR_SIZE : (size_t) r;
 390
 391             if (l > 0) {
 392                 struct pa_memchunk chunk;
 393
 394                 chunk.memblock = p->read.memblock;
 395                 chunk.index = p->read.index - PA_PSTREAM_DESCRIPTOR_SIZE - l;
 396                 chunk.length = l;
 397
 398                 if (p->recieve_memblock_callback)
 399                     p->recieve_memblock_callback(
 400                         p,
 401                         ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL]),
 402                         ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_DELTA]),
 403                         &chunk,
 404                         p->recieve_memblock_callback_userdata);
 405             }
 406         }
 407
 408         /* Frame complete */
 409         if (p->read.index >= ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]) + PA_PSTREAM_DESCRIPTOR_SIZE) {
 410             if (p->read.memblock) {
 411                 assert(!p->read.packet);
 412
 413                 pa_memblock_unref(p->read.memblock);
 414                 p->read.memblock = NULL;
 415             } else {
 416                 assert(p->read.packet);
 417
 418                 if (p->recieve_packet_callback)
 419                     p->recieve_packet_callback(p, p->read.packet, p->recieve_packet_callback_userdata);
 420
 421                 pa_packet_unref(p->read.packet);
 422                 p->read.packet = NULL;
 423             }
 424
 425             p->read.index = 0;
 426         }
 427     }
 428
 429     return;
 430
 431 die:
 432     p->dead = 1;
 433     if (p->die_callback)
 434         p->die_callback(p, p->die_callback_userdata);
 435
 436 }
 437
 438 void pa_pstream_set_die_callback(struct pa_pstream *p, void (*callback)(struct pa_pstream *p, void *userdata), void *userdata) {
 439     assert(p && callback);
 440     p->die_callback = callback;
 441     p->die_callback_userdata = userdata;
 442 }
 443
 444 int pa_pstream_is_pending(struct pa_pstream *p) {
 445     assert(p);
 446
 447     if (p->dead)
 448         return 0;
 449
 450     return p->write.current || !pa_queue_is_empty(p->send_queue);
 451 }
 452
 453 void pa_pstream_set_drain_callback(struct pa_pstream *p, void (*cb)(struct pa_pstream *p, void *userdata), void *userdata) {
 454     assert(p);
 455
 456     p->drain_callback = cb;
 457     p->drain_userdata = userdata;
 458 }
 459
 460 void pa_pstream_unref(struct pa_pstream*p) {
 461     assert(p && p->ref >= 1);
 462
 463     if (!(--(p->ref)))
 464         pstream_free(p);
 465 }
 466
 467 struct pa_pstream* pa_pstream_ref(struct pa_pstream*p) {
 468     assert(p && p->ref >= 1);
 469     p->ref++;
 470     return p;
 471 }
 472
 473 void pa_pstream_close(struct pa_pstream *p) {
 474     assert(p);
 475
 476     p->dead = 1;
 477
 478     if (p->io) {
 479         pa_iochannel_free(p->io);
 480         p->io = NULL;
 481     }
 482
 483     if (p->defer_event) {
 484         p->mainloop->defer_free(p->defer_event);
 485         p->defer_event = NULL;
 486     }
 487
 488     p->die_callback = NULL;
 489     p->drain_callback = NULL;
 490     p->recieve_packet_callback = NULL;
 491     p->recieve_memblock_callback = NULL;
 492 }