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