code.delx.au - pulseaudio/blob - src/pulsecore/tagstruct.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio 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   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; 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 <string.h>
  28 #include <unistd.h>
  29 #include <sys/time.h>
  30 #include <stdarg.h>
  31
  32 #ifdef HAVE_NETINET_IN_H
  33 #include <netinet/in.h>
  34 #endif
  35
  36 #include <pulse/xmalloc.h>
  37
  38 #include <pulsecore/socket.h>
  39 #include <pulsecore/macro.h>
  40
  41 #include "tagstruct.h"
  42
  43 #define MAX_TAG_SIZE (64*1024)
  44
  45 struct pa_tagstruct {
  46     uint8_t *data;
  47     size_t length, allocated;
  48     size_t rindex;
  49
  50     pa_bool_t dynamic;
  51 };
  52
  53 pa_tagstruct *pa_tagstruct_new(const uint8_t* data, size_t length) {
  54     pa_tagstruct*t;
  55
  56     pa_assert(!data || (data && length));
  57
  58     t = pa_xnew(pa_tagstruct, 1);
  59     t->data = (uint8_t*) data;
  60     t->allocated = t->length = data ? length : 0;
  61     t->rindex = 0;
  62     t->dynamic = !data;
  63
  64     return t;
  65 }
  66
  67 void pa_tagstruct_free(pa_tagstruct*t) {
  68     pa_assert(t);
  69
  70     if (t->dynamic)
  71         pa_xfree(t->data);
  72     pa_xfree(t);
  73 }
  74
  75 uint8_t* pa_tagstruct_free_data(pa_tagstruct*t, size_t *l) {
  76     uint8_t *p;
  77
  78     pa_assert(t);
  79     pa_assert(t->dynamic);
  80     pa_assert(l);
  81
  82     p = t->data;
  83     *l = t->length;
  84     pa_xfree(t);
  85     return p;
  86 }
  87
  88 static void extend(pa_tagstruct*t, size_t l) {
  89     pa_assert(t);
  90     pa_assert(t->dynamic);
  91
  92     if (t->length+l <= t->allocated)
  93         return;
  94
  95     t->data = pa_xrealloc(t->data, t->allocated = t->length+l+100);
  96 }
  97
  98 void pa_tagstruct_puts(pa_tagstruct*t, const char *s) {
  99     size_t l;
 100     pa_assert(t);
 101
 102     if (s) {
 103         l = strlen(s)+2;
 104         extend(t, l);
 105         t->data[t->length] = PA_TAG_STRING;
 106         strcpy((char*) (t->data+t->length+1), s);
 107         t->length += l;
 108     } else {
 109         extend(t, 1);
 110         t->data[t->length] = PA_TAG_STRING_NULL;
 111         t->length += 1;
 112     }
 113 }
 114
 115 void pa_tagstruct_putu32(pa_tagstruct*t, uint32_t i) {
 116     pa_assert(t);
 117
 118     extend(t, 5);
 119     t->data[t->length] = PA_TAG_U32;
 120     i = htonl(i);
 121     memcpy(t->data+t->length+1, &i, 4);
 122     t->length += 5;
 123 }
 124
 125 void pa_tagstruct_putu8(pa_tagstruct*t, uint8_t c) {
 126     pa_assert(t);
 127
 128     extend(t, 2);
 129     t->data[t->length] = PA_TAG_U8;
 130     *(t->data+t->length+1) = c;
 131     t->length += 2;
 132 }
 133
 134 void pa_tagstruct_put_sample_spec(pa_tagstruct *t, const pa_sample_spec *ss) {
 135     uint32_t rate;
 136
 137     pa_assert(t);
 138     pa_assert(ss);
 139
 140     extend(t, 7);
 141     t->data[t->length] = PA_TAG_SAMPLE_SPEC;
 142     t->data[t->length+1] = (uint8_t) ss->format;
 143     t->data[t->length+2] = ss->channels;
 144     rate = htonl(ss->rate);
 145     memcpy(t->data+t->length+3, &rate, 4);
 146     t->length += 7;
 147 }
 148
 149 void pa_tagstruct_put_arbitrary(pa_tagstruct *t, const void *p, size_t length) {
 150     uint32_t tmp;
 151
 152     pa_assert(t);
 153     pa_assert(p);
 154
 155     extend(t, 5+length);
 156     t->data[t->length] = PA_TAG_ARBITRARY;
 157     tmp = htonl((uint32_t) length);
 158     memcpy(t->data+t->length+1, &tmp, 4);
 159     if (length)
 160         memcpy(t->data+t->length+5, p, length);
 161     t->length += 5+length;
 162 }
 163
 164 void pa_tagstruct_put_boolean(pa_tagstruct*t, pa_bool_t b) {
 165     pa_assert(t);
 166
 167     extend(t, 1);
 168     t->data[t->length] = (uint8_t) (b ? PA_TAG_BOOLEAN_TRUE : PA_TAG_BOOLEAN_FALSE);
 169     t->length += 1;
 170 }
 171
 172 void pa_tagstruct_put_timeval(pa_tagstruct*t, const struct timeval *tv) {
 173     uint32_t tmp;
 174     pa_assert(t);
 175
 176     extend(t, 9);
 177     t->data[t->length] = PA_TAG_TIMEVAL;
 178     tmp = htonl((uint32_t) tv->tv_sec);
 179     memcpy(t->data+t->length+1, &tmp, 4);
 180     tmp = htonl((uint32_t) tv->tv_usec);
 181     memcpy(t->data+t->length+5, &tmp, 4);
 182     t->length += 9;
 183 }
 184
 185 void pa_tagstruct_put_usec(pa_tagstruct*t, pa_usec_t u) {
 186     uint32_t tmp;
 187
 188     pa_assert(t);
 189
 190     extend(t, 9);
 191     t->data[t->length] = PA_TAG_USEC;
 192     tmp = htonl((uint32_t) (u >> 32));
 193     memcpy(t->data+t->length+1, &tmp, 4);
 194     tmp = htonl((uint32_t) u);
 195     memcpy(t->data+t->length+5, &tmp, 4);
 196     t->length += 9;
 197 }
 198
 199 void pa_tagstruct_putu64(pa_tagstruct*t, uint64_t u) {
 200     uint32_t tmp;
 201
 202     pa_assert(t);
 203
 204     extend(t, 9);
 205     t->data[t->length] = PA_TAG_U64;
 206     tmp = htonl((uint32_t) (u >> 32));
 207     memcpy(t->data+t->length+1, &tmp, 4);
 208     tmp = htonl((uint32_t) u);
 209     memcpy(t->data+t->length+5, &tmp, 4);
 210     t->length += 9;
 211 }
 212
 213 void pa_tagstruct_puts64(pa_tagstruct*t, int64_t u) {
 214     uint32_t tmp;
 215
 216     pa_assert(t);
 217
 218     extend(t, 9);
 219     t->data[t->length] = PA_TAG_S64;
 220     tmp = htonl((uint32_t) ((uint64_t) u >> 32));
 221     memcpy(t->data+t->length+1, &tmp, 4);
 222     tmp = htonl((uint32_t) ((uint64_t) u));
 223     memcpy(t->data+t->length+5, &tmp, 4);
 224     t->length += 9;
 225 }
 226
 227 void pa_tagstruct_put_channel_map(pa_tagstruct *t, const pa_channel_map *map) {
 228     unsigned i;
 229
 230     pa_assert(t);
 231     pa_assert(map);
 232     extend(t, 2 + (size_t) map->channels);
 233
 234     t->data[t->length++] = PA_TAG_CHANNEL_MAP;
 235     t->data[t->length++] = map->channels;
 236
 237     for (i = 0; i < map->channels; i ++)
 238         t->data[t->length++] = (uint8_t) map->map[i];
 239 }
 240
 241 void pa_tagstruct_put_cvolume(pa_tagstruct *t, const pa_cvolume *cvolume) {
 242     unsigned i;
 243     pa_volume_t vol;
 244
 245     pa_assert(t);
 246     pa_assert(cvolume);
 247     extend(t, 2 + cvolume->channels * sizeof(pa_volume_t));
 248
 249     t->data[t->length++] = PA_TAG_CVOLUME;
 250     t->data[t->length++] = cvolume->channels;
 251
 252     for (i = 0; i < cvolume->channels; i ++) {
 253         vol = htonl(cvolume->values[i]);
 254         memcpy(t->data + t->length, &vol, sizeof(pa_volume_t));
 255         t->length += sizeof(pa_volume_t);
 256     }
 257 }
 258
 259 void pa_tagstruct_put_volume(pa_tagstruct *t, pa_volume_t vol) {
 260     uint32_t u;
 261     pa_assert(t);
 262
 263     extend(t, 5);
 264     t->data[t->length] = PA_TAG_VOLUME;
 265     u = htonl((uint32_t) vol);
 266     memcpy(t->data+t->length+1, &u, 4);
 267     t->length += 5;
 268 }
 269
 270 void pa_tagstruct_put_proplist(pa_tagstruct *t, pa_proplist *p) {
 271     void *state = NULL;
 272     pa_assert(t);
 273     pa_assert(p);
 274
 275     extend(t, 1);
 276
 277     t->data[t->length++] = PA_TAG_PROPLIST;
 278
 279     for (;;) {
 280         const char *k;
 281         const void *d;
 282         size_t l;
 283
 284         if (!(k = pa_proplist_iterate(p, &state)))
 285             break;
 286
 287         pa_tagstruct_puts(t, k);
 288         pa_assert_se(pa_proplist_get(p, k, &d, &l) >= 0);
 289         pa_tagstruct_putu32(t, (uint32_t) l);
 290         pa_tagstruct_put_arbitrary(t, d, l);
 291     }
 292
 293     pa_tagstruct_puts(t, NULL);
 294 }
 295
 296 void pa_tagstruct_put_format_info(pa_tagstruct *t, pa_format_info *f) {
 297     pa_assert(t);
 298     pa_assert(f);
 299
 300     extend(t, 1);
 301
 302     t->data[t->length++] = PA_TAG_FORMAT_INFO;
 303     pa_tagstruct_putu8(t, (uint8_t) f->encoding);
 304     pa_tagstruct_put_proplist(t, f->plist);
 305 }
 306
 307 int pa_tagstruct_gets(pa_tagstruct*t, const char **s) {
 308     int error = 0;
 309     size_t n;
 310     char *c;
 311
 312     pa_assert(t);
 313     pa_assert(s);
 314
 315     if (t->rindex+1 > t->length)
 316         return -1;
 317
 318     if (t->data[t->rindex] == PA_TAG_STRING_NULL) {
 319         t->rindex++;
 320         *s = NULL;
 321         return 0;
 322     }
 323
 324     if (t->rindex+2 > t->length)
 325         return -1;
 326
 327     if (t->data[t->rindex] != PA_TAG_STRING)
 328         return -1;
 329
 330     error = 1;
 331     for (n = 0, c = (char*) (t->data+t->rindex+1); t->rindex+1+n < t->length; n++, c++)
 332         if (!*c) {
 333             error = 0;
 334             break;
 335         }
 336
 337     if (error)
 338         return -1;
 339
 340     *s = (char*) (t->data+t->rindex+1);
 341
 342     t->rindex += n+2;
 343     return 0;
 344 }
 345
 346 int pa_tagstruct_getu32(pa_tagstruct*t, uint32_t *i) {
 347     pa_assert(t);
 348     pa_assert(i);
 349
 350     if (t->rindex+5 > t->length)
 351         return -1;
 352
 353     if (t->data[t->rindex] != PA_TAG_U32)
 354         return -1;
 355
 356     memcpy(i, t->data+t->rindex+1, 4);
 357     *i = ntohl(*i);
 358     t->rindex += 5;
 359     return 0;
 360 }
 361
 362 int pa_tagstruct_getu8(pa_tagstruct*t, uint8_t *c) {
 363     pa_assert(t);
 364     pa_assert(c);
 365
 366     if (t->rindex+2 > t->length)
 367         return -1;
 368
 369     if (t->data[t->rindex] != PA_TAG_U8)
 370         return -1;
 371
 372     *c = t->data[t->rindex+1];
 373     t->rindex +=2;
 374     return 0;
 375 }
 376
 377 int pa_tagstruct_get_sample_spec(pa_tagstruct *t, pa_sample_spec *ss) {
 378     pa_assert(t);
 379     pa_assert(ss);
 380
 381     if (t->rindex+7 > t->length)
 382         return -1;
 383
 384     if (t->data[t->rindex] != PA_TAG_SAMPLE_SPEC)
 385         return -1;
 386
 387     ss->format = t->data[t->rindex+1];
 388     ss->channels = t->data[t->rindex+2];
 389     memcpy(&ss->rate, t->data+t->rindex+3, 4);
 390     ss->rate = ntohl(ss->rate);
 391
 392     t->rindex += 7;
 393     return 0;
 394 }
 395
 396 int pa_tagstruct_get_arbitrary(pa_tagstruct *t, const void **p, size_t length) {
 397     uint32_t len;
 398
 399     pa_assert(t);
 400     pa_assert(p);
 401
 402     if (t->rindex+5+length > t->length)
 403         return -1;
 404
 405     if (t->data[t->rindex] != PA_TAG_ARBITRARY)
 406         return -1;
 407
 408     memcpy(&len, t->data+t->rindex+1, 4);
 409     if (ntohl(len) != length)
 410         return -1;
 411
 412     *p = t->data+t->rindex+5;
 413     t->rindex += 5+length;
 414     return 0;
 415 }
 416
 417 int pa_tagstruct_eof(pa_tagstruct*t) {
 418     pa_assert(t);
 419
 420     return t->rindex >= t->length;
 421 }
 422
 423 const uint8_t* pa_tagstruct_data(pa_tagstruct*t, size_t *l) {
 424     pa_assert(t);
 425     pa_assert(t->dynamic);
 426     pa_assert(l);
 427
 428     *l = t->length;
 429     return t->data;
 430 }
 431
 432 int pa_tagstruct_get_boolean(pa_tagstruct*t, pa_bool_t *b) {
 433     pa_assert(t);
 434     pa_assert(b);
 435
 436     if (t->rindex+1 > t->length)
 437         return -1;
 438
 439     if (t->data[t->rindex] == PA_TAG_BOOLEAN_TRUE)
 440         *b = TRUE;
 441     else if (t->data[t->rindex] == PA_TAG_BOOLEAN_FALSE)
 442         *b = FALSE;
 443     else
 444         return -1;
 445
 446     t->rindex +=1;
 447     return 0;
 448 }
 449
 450 int pa_tagstruct_get_timeval(pa_tagstruct*t, struct timeval *tv) {
 451
 452     pa_assert(t);
 453     pa_assert(tv);
 454
 455     if (t->rindex+9 > t->length)
 456         return -1;
 457
 458     if (t->data[t->rindex] != PA_TAG_TIMEVAL)
 459         return -1;
 460
 461     memcpy(&tv->tv_sec, t->data+t->rindex+1, 4);
 462     tv->tv_sec = (time_t) ntohl((uint32_t) tv->tv_sec);
 463     memcpy(&tv->tv_usec, t->data+t->rindex+5, 4);
 464     tv->tv_usec = (suseconds_t) ntohl((uint32_t) tv->tv_usec);
 465     t->rindex += 9;
 466     return 0;
 467 }
 468
 469 int pa_tagstruct_get_usec(pa_tagstruct*t, pa_usec_t *u) {
 470     uint32_t tmp;
 471
 472     pa_assert(t);
 473     pa_assert(u);
 474
 475     if (t->rindex+9 > t->length)
 476         return -1;
 477
 478     if (t->data[t->rindex] != PA_TAG_USEC)
 479         return -1;
 480
 481     memcpy(&tmp, t->data+t->rindex+1, 4);
 482     *u = (pa_usec_t) ntohl(tmp) << 32;
 483     memcpy(&tmp, t->data+t->rindex+5, 4);
 484     *u |= (pa_usec_t) ntohl(tmp);
 485     t->rindex +=9;
 486     return 0;
 487 }
 488
 489 int pa_tagstruct_getu64(pa_tagstruct*t, uint64_t *u) {
 490     uint32_t tmp;
 491
 492     pa_assert(t);
 493     pa_assert(u);
 494
 495     if (t->rindex+9 > t->length)
 496         return -1;
 497
 498     if (t->data[t->rindex] != PA_TAG_U64)
 499         return -1;
 500
 501     memcpy(&tmp, t->data+t->rindex+1, 4);
 502     *u = (uint64_t) ntohl(tmp) << 32;
 503     memcpy(&tmp, t->data+t->rindex+5, 4);
 504     *u |= (uint64_t) ntohl(tmp);
 505     t->rindex +=9;
 506     return 0;
 507 }
 508
 509 int pa_tagstruct_gets64(pa_tagstruct*t, int64_t *u) {
 510     uint32_t tmp;
 511
 512     pa_assert(t);
 513     pa_assert(u);
 514
 515     if (t->rindex+9 > t->length)
 516         return -1;
 517
 518     if (t->data[t->rindex] != PA_TAG_S64)
 519         return -1;
 520
 521     memcpy(&tmp, t->data+t->rindex+1, 4);
 522     *u = (int64_t) ((uint64_t) ntohl(tmp) << 32);
 523     memcpy(&tmp, t->data+t->rindex+5, 4);
 524     *u |= (int64_t) ntohl(tmp);
 525     t->rindex +=9;
 526     return 0;
 527 }
 528
 529 int pa_tagstruct_get_channel_map(pa_tagstruct *t, pa_channel_map *map) {
 530     unsigned i;
 531
 532     pa_assert(t);
 533     pa_assert(map);
 534
 535     if (t->rindex+2 > t->length)
 536         return -1;
 537
 538     if (t->data[t->rindex] != PA_TAG_CHANNEL_MAP)
 539         return -1;
 540
 541     if ((map->channels = t->data[t->rindex+1]) > PA_CHANNELS_MAX)
 542         return -1;
 543
 544     if (t->rindex+2+map->channels > t->length)
 545         return -1;
 546
 547     for (i = 0; i < map->channels; i ++)
 548         map->map[i] = (int8_t) t->data[t->rindex + 2 + i];
 549
 550     t->rindex += 2 + (size_t) map->channels;
 551     return 0;
 552 }
 553
 554 int pa_tagstruct_get_cvolume(pa_tagstruct *t, pa_cvolume *cvolume) {
 555     unsigned i;
 556     pa_volume_t vol;
 557
 558     pa_assert(t);
 559     pa_assert(cvolume);
 560
 561     if (t->rindex+2 > t->length)
 562         return -1;
 563
 564     if (t->data[t->rindex] != PA_TAG_CVOLUME)
 565         return -1;
 566
 567     if ((cvolume->channels = t->data[t->rindex+1]) > PA_CHANNELS_MAX)
 568         return -1;
 569
 570     if (t->rindex+2+cvolume->channels*sizeof(pa_volume_t) > t->length)
 571         return -1;
 572
 573     for (i = 0; i < cvolume->channels; i ++) {
 574         memcpy(&vol, t->data + t->rindex + 2 + i * sizeof(pa_volume_t), sizeof(pa_volume_t));
 575         cvolume->values[i] = (pa_volume_t) ntohl(vol);
 576     }
 577
 578     t->rindex += 2 + cvolume->channels * sizeof(pa_volume_t);
 579     return 0;
 580 }
 581
 582 int pa_tagstruct_get_volume(pa_tagstruct*t, pa_volume_t *vol) {
 583     uint32_t u;
 584
 585     pa_assert(t);
 586     pa_assert(vol);
 587
 588     if (t->rindex+5 > t->length)
 589         return -1;
 590
 591     if (t->data[t->rindex] != PA_TAG_VOLUME)
 592         return -1;
 593
 594     memcpy(&u, t->data+t->rindex+1, 4);
 595     *vol = (pa_volume_t) ntohl(u);
 596
 597     t->rindex += 5;
 598     return 0;
 599 }
 600
 601 int pa_tagstruct_get_proplist(pa_tagstruct *t, pa_proplist *p) {
 602     size_t saved_rindex;
 603
 604     pa_assert(t);
 605     pa_assert(p);
 606
 607     if (t->rindex+1 > t->length)
 608         return -1;
 609
 610     if (t->data[t->rindex] != PA_TAG_PROPLIST)
 611         return -1;
 612
 613     saved_rindex = t->rindex;
 614     t->rindex++;
 615
 616     for (;;) {
 617         const char *k;
 618         const void *d;
 619         uint32_t length;
 620
 621         if (pa_tagstruct_gets(t, &k) < 0)
 622             goto fail;
 623
 624         if (!k)
 625             break;
 626
 627         if (pa_tagstruct_getu32(t, &length) < 0)
 628             goto fail;
 629
 630         if (length > MAX_TAG_SIZE)
 631             goto fail;
 632
 633         if (pa_tagstruct_get_arbitrary(t, &d, length) < 0)
 634             goto fail;
 635
 636         if (pa_proplist_set(p, k, d, length) < 0)
 637             goto fail;
 638     }
 639
 640     return 0;
 641
 642 fail:
 643     t->rindex = saved_rindex;
 644     return -1;
 645 }
 646
 647 int pa_tagstruct_get_format_info(pa_tagstruct *t, pa_format_info *f) {
 648     size_t saved_rindex;
 649     uint8_t encoding;
 650
 651     pa_assert(t);
 652     pa_assert(f);
 653
 654     if (t->rindex+1 > t->length)
 655         return -1;
 656
 657     if (t->data[t->rindex] != PA_TAG_FORMAT_INFO)
 658         return -1;
 659
 660     saved_rindex = t->rindex;
 661     t->rindex++;
 662
 663     if (pa_tagstruct_getu8(t, &encoding) < 0)
 664         goto fail;
 665
 666     f->encoding = encoding;
 667
 668     if (pa_tagstruct_get_proplist(t, f->plist) < 0)
 669         goto fail;
 670
 671     return 0;
 672
 673 fail:
 674     t->rindex = saved_rindex;
 675     return -1;
 676 }
 677
 678 void pa_tagstruct_put(pa_tagstruct *t, ...) {
 679     va_list va;
 680     pa_assert(t);
 681
 682     va_start(va, t);
 683
 684     for (;;) {
 685         int tag = va_arg(va, int);
 686
 687         if (tag == PA_TAG_INVALID)
 688             break;
 689
 690         switch (tag) {
 691             case PA_TAG_STRING:
 692             case PA_TAG_STRING_NULL:
 693                 pa_tagstruct_puts(t, va_arg(va, char*));
 694                 break;
 695
 696             case PA_TAG_U32:
 697                 pa_tagstruct_putu32(t, va_arg(va, uint32_t));
 698                 break;
 699
 700             case PA_TAG_U8:
 701                 pa_tagstruct_putu8(t, (uint8_t) va_arg(va, int));
 702                 break;
 703
 704             case PA_TAG_U64:
 705                 pa_tagstruct_putu64(t, va_arg(va, uint64_t));
 706                 break;
 707
 708             case PA_TAG_SAMPLE_SPEC:
 709                 pa_tagstruct_put_sample_spec(t, va_arg(va, pa_sample_spec*));
 710                 break;
 711
 712             case PA_TAG_ARBITRARY: {
 713                 void *p = va_arg(va, void*);
 714                 size_t size = va_arg(va, size_t);
 715                 pa_tagstruct_put_arbitrary(t, p, size);
 716                 break;
 717             }
 718
 719             case PA_TAG_BOOLEAN_TRUE:
 720             case PA_TAG_BOOLEAN_FALSE:
 721                 pa_tagstruct_put_boolean(t, va_arg(va, int));
 722                 break;
 723
 724             case PA_TAG_TIMEVAL:
 725                 pa_tagstruct_put_timeval(t, va_arg(va, struct timeval*));
 726                 break;
 727
 728             case PA_TAG_USEC:
 729                 pa_tagstruct_put_usec(t, va_arg(va, pa_usec_t));
 730                 break;
 731
 732             case PA_TAG_CHANNEL_MAP:
 733                 pa_tagstruct_put_channel_map(t, va_arg(va, pa_channel_map *));
 734                 break;
 735
 736             case PA_TAG_CVOLUME:
 737                 pa_tagstruct_put_cvolume(t, va_arg(va, pa_cvolume *));
 738                 break;
 739
 740             case PA_TAG_VOLUME:
 741                 pa_tagstruct_put_volume(t, va_arg(va, pa_volume_t));
 742                 break;
 743
 744             case PA_TAG_PROPLIST:
 745                 pa_tagstruct_put_proplist(t, va_arg(va, pa_proplist *));
 746                 break;
 747
 748             default:
 749                 pa_assert_not_reached();
 750         }
 751     }
 752
 753     va_end(va);
 754 }
 755
 756 int pa_tagstruct_get(pa_tagstruct *t, ...) {
 757     va_list va;
 758     int ret = 0;
 759
 760     pa_assert(t);
 761
 762     va_start(va, t);
 763     while (ret == 0) {
 764         int tag = va_arg(va, int);
 765
 766         if (tag == PA_TAG_INVALID)
 767             break;
 768
 769         switch (tag) {
 770             case PA_TAG_STRING:
 771             case PA_TAG_STRING_NULL:
 772                 ret = pa_tagstruct_gets(t, va_arg(va, const char**));
 773                 break;
 774
 775             case PA_TAG_U32:
 776                 ret = pa_tagstruct_getu32(t, va_arg(va, uint32_t*));
 777                 break;
 778
 779             case PA_TAG_U8:
 780                 ret = pa_tagstruct_getu8(t, va_arg(va, uint8_t*));
 781                 break;
 782
 783             case PA_TAG_U64:
 784                 ret = pa_tagstruct_getu64(t, va_arg(va, uint64_t*));
 785                 break;
 786
 787             case PA_TAG_SAMPLE_SPEC:
 788                 ret = pa_tagstruct_get_sample_spec(t, va_arg(va, pa_sample_spec*));
 789                 break;
 790
 791             case PA_TAG_ARBITRARY: {
 792                 const void **p = va_arg(va, const void**);
 793                 size_t size = va_arg(va, size_t);
 794                 ret = pa_tagstruct_get_arbitrary(t, p, size);
 795                 break;
 796             }
 797
 798             case PA_TAG_BOOLEAN_TRUE:
 799             case PA_TAG_BOOLEAN_FALSE:
 800                 ret = pa_tagstruct_get_boolean(t, va_arg(va, pa_bool_t*));
 801                 break;
 802
 803             case PA_TAG_TIMEVAL:
 804                 ret = pa_tagstruct_get_timeval(t, va_arg(va, struct timeval*));
 805                 break;
 806
 807             case PA_TAG_USEC:
 808                 ret = pa_tagstruct_get_usec(t, va_arg(va, pa_usec_t*));
 809                 break;
 810
 811             case PA_TAG_CHANNEL_MAP:
 812                 ret = pa_tagstruct_get_channel_map(t, va_arg(va, pa_channel_map *));
 813                 break;
 814
 815             case PA_TAG_CVOLUME:
 816                 ret = pa_tagstruct_get_cvolume(t, va_arg(va, pa_cvolume *));
 817                 break;
 818
 819             case PA_TAG_VOLUME:
 820                 ret = pa_tagstruct_get_volume(t, va_arg(va, pa_volume_t *));
 821                 break;
 822
 823             case PA_TAG_PROPLIST:
 824                 ret = pa_tagstruct_get_proplist(t, va_arg(va, pa_proplist *));
 825                 break;
 826
 827             default:
 828                 pa_assert_not_reached();
 829         }
 830
 831     }
 832
 833     va_end(va);
 834     return ret;
 835 }