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