code.delx.au - pulseaudio/blob - polyp/polyplib-stream.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 <assert.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "polyplib-internal.h"
  32 #include "xmalloc.h"
  33 #include "pstream-util.h"
  34 #include "util.h"
  35
  36 #define LATENCY_IPOL_INTERVAL_USEC (100000L)
  37
  38 struct pa_stream *pa_stream_new(struct pa_context *c, const char *name, const struct pa_sample_spec *ss) {
  39     struct pa_stream *s;
  40     assert(c && ss);
  41
  42     s = pa_xmalloc(sizeof(struct pa_stream));
  43     s->ref = 1;
  44     s->context = c;
  45     s->mainloop = c->mainloop;
  46
  47     s->read_callback = NULL;
  48     s->read_userdata = NULL;
  49     s->write_callback = NULL;
  50     s->write_userdata = NULL;
  51     s->state_callback = NULL;
  52     s->state_userdata = NULL;
  53
  54     s->direction = PA_STREAM_NODIRECTION;
  55     s->name = pa_xstrdup(name);
  56     s->sample_spec = *ss;
  57     s->channel = 0;
  58     s->channel_valid = 0;
  59     s->device_index = PA_INVALID_INDEX;
  60     s->requested_bytes = 0;
  61     s->state = PA_STREAM_DISCONNECTED;
  62     memset(&s->buffer_attr, 0, sizeof(s->buffer_attr));
  63
  64     s->counter = 0;
  65     s->previous_time = 0;
  66
  67     s->corked = 0;
  68     s->interpolate = 0;
  69
  70     s->ipol_usec = 0;
  71     memset(&s->ipol_timestamp, 0, sizeof(s->ipol_timestamp));
  72     s->ipol_event = NULL;
  73
  74     PA_LLIST_PREPEND(struct pa_stream, c->streams, s);
  75
  76     return pa_stream_ref(s);
  77 }
  78
  79 static void stream_free(struct pa_stream *s) {
  80     assert(s);
  81
  82     if (s->ipol_event) {
  83         assert(s->mainloop);
  84         s->mainloop->time_free(s->ipol_event);
  85     }
  86
  87     pa_xfree(s->name);
  88     pa_xfree(s);
  89 }
  90
  91 void pa_stream_unref(struct pa_stream *s) {
  92     assert(s && s->ref >= 1);
  93
  94     if (--(s->ref) == 0)
  95         stream_free(s);
  96 }
  97
  98 struct pa_stream* pa_stream_ref(struct pa_stream *s) {
  99     assert(s && s->ref >= 1);
 100     s->ref++;
 101     return s;
 102 }
 103
 104 enum pa_stream_state pa_stream_get_state(struct pa_stream *s) {
 105     assert(s && s->ref >= 1);
 106     return s->state;
 107 }
 108
 109 struct pa_context* pa_stream_get_context(struct pa_stream *s) {
 110     assert(s && s->ref >= 1);
 111     return s->context;
 112 }
 113
 114 uint32_t pa_stream_get_index(struct pa_stream *s) {
 115     assert(s && s->ref >= 1);
 116     return s->device_index;
 117 }
 118
 119 void pa_stream_set_state(struct pa_stream *s, enum pa_stream_state st) {
 120     assert(s && s->ref >= 1);
 121
 122     if (s->state == st)
 123         return;
 124
 125     pa_stream_ref(s);
 126
 127     s->state = st;
 128
 129     if ((st == PA_STREAM_FAILED || st == PA_STREAM_TERMINATED) && s->context) {
 130         if (s->channel_valid)
 131             pa_dynarray_put((s->direction == PA_STREAM_PLAYBACK) ? s->context->playback_streams : s->context->record_streams, s->channel, NULL);
 132
 133         PA_LLIST_REMOVE(struct pa_stream, s->context->streams, s);
 134         pa_stream_unref(s);
 135     }
 136
 137     if (s->state_callback)
 138         s->state_callback(s, s->state_userdata);
 139
 140     pa_stream_unref(s);
 141 }
 142
 143 void pa_command_stream_killed(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 144     struct pa_context *c = userdata;
 145     struct pa_stream *s;
 146     uint32_t channel;
 147     assert(pd && (command == PA_COMMAND_PLAYBACK_STREAM_KILLED || command == PA_COMMAND_RECORD_STREAM_KILLED) && t && c);
 148
 149     pa_context_ref(c);
 150
 151     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 152         !pa_tagstruct_eof(t)) {
 153         pa_context_fail(c, PA_ERROR_PROTOCOL);
 154         goto finish;
 155     }
 156
 157     if (!(s = pa_dynarray_get(command == PA_COMMAND_PLAYBACK_STREAM_KILLED ? c->playback_streams : c->record_streams, channel)))
 158         goto finish;
 159
 160     c->error = PA_ERROR_KILLED;
 161     pa_stream_set_state(s, PA_STREAM_FAILED);
 162
 163 finish:
 164     pa_context_unref(c);
 165 }
 166
 167 void pa_command_request(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 168     struct pa_stream *s;
 169     struct pa_context *c = userdata;
 170     uint32_t bytes, channel;
 171     assert(pd && command == PA_COMMAND_REQUEST && t && c);
 172
 173     pa_context_ref(c);
 174
 175     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 176         pa_tagstruct_getu32(t, &bytes) < 0 ||
 177         !pa_tagstruct_eof(t)) {
 178         pa_context_fail(c, PA_ERROR_PROTOCOL);
 179         goto finish;
 180     }
 181
 182     if (!(s = pa_dynarray_get(c->playback_streams, channel)))
 183         goto finish;
 184
 185     if (s->state != PA_STREAM_READY)
 186         goto finish;
 187
 188     pa_stream_ref(s);
 189
 190     s->requested_bytes += bytes;
 191
 192     if (s->requested_bytes && s->write_callback)
 193         s->write_callback(s, s->requested_bytes, s->write_userdata);
 194
 195     pa_stream_unref(s);
 196
 197 finish:
 198     pa_context_unref(c);
 199 }
 200
 201 static void ipol_callback(struct pa_mainloop_api *m, struct pa_time_event *e, const struct timeval *tv, void *userdata) {
 202     struct timeval tv2;
 203     struct pa_stream *s = userdata;
 204
 205     pa_stream_ref(s);
 206     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 207
 208     gettimeofday(&tv2, NULL);
 209     tv2.tv_usec += LATENCY_IPOL_INTERVAL_USEC;
 210
 211     m->time_restart(e, &tv2);
 212
 213     pa_stream_unref(s);
 214 }
 215
 216
 217 void pa_create_stream_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 218     struct pa_stream *s = userdata;
 219     assert(pd && s && s->state == PA_STREAM_CREATING);
 220
 221     pa_stream_ref(s);
 222
 223     if (command != PA_COMMAND_REPLY) {
 224         if (pa_context_handle_error(s->context, command, t) < 0)
 225             goto finish;
 226
 227         pa_stream_set_state(s, PA_STREAM_FAILED);
 228         goto finish;
 229     }
 230
 231     if (pa_tagstruct_getu32(t, &s->channel) < 0 ||
 232         ((s->direction != PA_STREAM_UPLOAD) && pa_tagstruct_getu32(t, &s->device_index) < 0) ||
 233         ((s->direction != PA_STREAM_RECORD) && pa_tagstruct_getu32(t, &s->requested_bytes) < 0) ||
 234         !pa_tagstruct_eof(t)) {
 235         pa_context_fail(s->context, PA_ERROR_PROTOCOL);
 236         goto finish;
 237     }
 238
 239     s->channel_valid = 1;
 240     pa_dynarray_put((s->direction == PA_STREAM_RECORD) ? s->context->record_streams : s->context->playback_streams, s->channel, s);
 241     pa_stream_set_state(s, PA_STREAM_READY);
 242
 243     if (s->interpolate) {
 244         struct timeval tv;
 245         pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 246
 247         gettimeofday(&tv, NULL);
 248         tv.tv_usec += LATENCY_IPOL_INTERVAL_USEC; /* every 100 ms */
 249
 250         assert(!s->ipol_event);
 251         s->ipol_event = s->mainloop->time_new(s->mainloop, &tv, &ipol_callback, s);
 252     }
 253
 254     if (s->requested_bytes && s->ref > 1 && s->write_callback)
 255         s->write_callback(s, s->requested_bytes, s->write_userdata);
 256
 257 finish:
 258     pa_stream_unref(s);
 259 }
 260
 261 static void create_stream(struct pa_stream *s, const char *dev, const struct pa_buffer_attr *attr, enum pa_stream_flags flags, pa_volume_t volume) {
 262     struct pa_tagstruct *t;
 263     uint32_t tag;
 264     assert(s && s->ref >= 1 && s->state == PA_STREAM_DISCONNECTED);
 265
 266     pa_stream_ref(s);
 267
 268     s->interpolate = !!(flags & PA_STREAM_INTERPOLATE_LATENCY);
 269     pa_stream_trash_ipol(s);
 270
 271     if (attr)
 272         s->buffer_attr = *attr;
 273     else {
 274         s->buffer_attr.maxlength = DEFAULT_MAXLENGTH;
 275         s->buffer_attr.tlength = DEFAULT_TLENGTH;
 276         s->buffer_attr.prebuf = DEFAULT_PREBUF;
 277         s->buffer_attr.minreq = DEFAULT_MINREQ;
 278         s->buffer_attr.fragsize = DEFAULT_FRAGSIZE;
 279     }
 280
 281     pa_stream_set_state(s, PA_STREAM_CREATING);
 282
 283     t = pa_tagstruct_new(NULL, 0);
 284     assert(t);
 285
 286     if (!dev) {
 287         if (s->direction == PA_STREAM_PLAYBACK)
 288             dev = s->context->conf->default_sink;
 289         else
 290             dev = s->context->conf->default_source;
 291     }
 292
 293     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CREATE_PLAYBACK_STREAM : PA_COMMAND_CREATE_RECORD_STREAM);
 294     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 295     pa_tagstruct_puts(t, s->name);
 296     pa_tagstruct_put_sample_spec(t, &s->sample_spec);
 297     pa_tagstruct_putu32(t, PA_INVALID_INDEX);
 298     pa_tagstruct_puts(t, dev);
 299     pa_tagstruct_putu32(t, s->buffer_attr.maxlength);
 300     pa_tagstruct_put_boolean(t, !!(flags & PA_STREAM_START_CORKED));
 301     if (s->direction == PA_STREAM_PLAYBACK) {
 302         pa_tagstruct_putu32(t, s->buffer_attr.tlength);
 303         pa_tagstruct_putu32(t, s->buffer_attr.prebuf);
 304         pa_tagstruct_putu32(t, s->buffer_attr.minreq);
 305         pa_tagstruct_putu32(t, volume);
 306     } else
 307         pa_tagstruct_putu32(t, s->buffer_attr.fragsize);
 308
 309     pa_pstream_send_tagstruct(s->context->pstream, t);
 310     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_create_stream_callback, s);
 311
 312     pa_stream_unref(s);
 313 }
 314
 315 void pa_stream_connect_playback(struct pa_stream *s, const char *dev, const struct pa_buffer_attr *attr, enum pa_stream_flags flags, pa_volume_t volume) {
 316     assert(s && s->context->state == PA_CONTEXT_READY && s->ref >= 1);
 317     s->direction = PA_STREAM_PLAYBACK;
 318     create_stream(s, dev, attr, flags, volume);
 319 }
 320
 321 void pa_stream_connect_record(struct pa_stream *s, const char *dev, const struct pa_buffer_attr *attr, enum pa_stream_flags flags) {
 322     assert(s && s->context->state == PA_CONTEXT_READY && s->ref >= 1);
 323     s->direction = PA_STREAM_RECORD;
 324     create_stream(s, dev, attr, flags, 0);
 325 }
 326
 327 void pa_stream_write(struct pa_stream *s, const void *data, size_t length, void (*free_cb)(void *p), size_t delta) {
 328     struct pa_memchunk chunk;
 329     assert(s && s->context && data && length && s->state == PA_STREAM_READY && s->ref >= 1);
 330
 331     if (free_cb) {
 332         chunk.memblock = pa_memblock_new_user((void*) data, length, free_cb, s->context->memblock_stat);
 333         assert(chunk.memblock && chunk.memblock->data);
 334     } else {
 335         chunk.memblock = pa_memblock_new(length, s->context->memblock_stat);
 336         assert(chunk.memblock && chunk.memblock->data);
 337         memcpy(chunk.memblock->data, data, length);
 338     }
 339     chunk.index = 0;
 340     chunk.length = length;
 341
 342     pa_pstream_send_memblock(s->context->pstream, s->channel, delta, &chunk);
 343     pa_memblock_unref(chunk.memblock);
 344
 345     if (length < s->requested_bytes)
 346         s->requested_bytes -= length;
 347     else
 348         s->requested_bytes = 0;
 349
 350     s->counter += length;
 351 }
 352
 353 size_t pa_stream_writable_size(struct pa_stream *s) {
 354     assert(s && s->ref >= 1);
 355     return s->state == PA_STREAM_READY ? s->requested_bytes : 0;
 356 }
 357
 358 struct pa_operation * pa_stream_drain(struct pa_stream *s, void (*cb) (struct pa_stream*s, int success, void *userdata), void *userdata) {
 359     struct pa_operation *o;
 360     struct pa_tagstruct *t;
 361     uint32_t tag;
 362     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY);
 363
 364     o = pa_operation_new(s->context, s);
 365     assert(o);
 366     o->callback = cb;
 367     o->userdata = userdata;
 368
 369     t = pa_tagstruct_new(NULL, 0);
 370     assert(t);
 371     pa_tagstruct_putu32(t, PA_COMMAND_DRAIN_PLAYBACK_STREAM);
 372     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 373     pa_tagstruct_putu32(t, s->channel);
 374     pa_pstream_send_tagstruct(s->context->pstream, t);
 375     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 376
 377     return pa_operation_ref(o);
 378 }
 379
 380 static void stream_get_latency_info_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 381     struct pa_operation *o = userdata;
 382     struct pa_latency_info i, *p = NULL;
 383     struct timeval local, remote, now;
 384     assert(pd && o && o->stream && o->context);
 385
 386     if (command != PA_COMMAND_REPLY) {
 387         if (pa_context_handle_error(o->context, command, t) < 0)
 388             goto finish;
 389
 390     } else if (pa_tagstruct_get_usec(t, &i.buffer_usec) < 0 ||
 391                pa_tagstruct_get_usec(t, &i.sink_usec) < 0 ||
 392                pa_tagstruct_get_usec(t, &i.source_usec) < 0 ||
 393                pa_tagstruct_get_boolean(t, &i.playing) < 0 ||
 394                pa_tagstruct_getu32(t, &i.queue_length) < 0 ||
 395                pa_tagstruct_get_timeval(t, &local) < 0 ||
 396                pa_tagstruct_get_timeval(t, &remote) < 0 ||
 397                pa_tagstruct_getu64(t, &i.counter) < 0 ||
 398                !pa_tagstruct_eof(t)) {
 399         pa_context_fail(o->context, PA_ERROR_PROTOCOL);
 400         goto finish;
 401     } else {
 402         gettimeofday(&now, NULL);
 403
 404         if (pa_timeval_cmp(&local, &remote) < 0 && pa_timeval_cmp(&remote, &now)) {
 405             /* local and remote seem to have synchronized clocks */
 406
 407             if (o->stream->direction == PA_STREAM_PLAYBACK)
 408                 i.transport_usec = pa_timeval_diff(&remote, &local);
 409             else
 410                 i.transport_usec = pa_timeval_diff(&now, &remote);
 411
 412             i.synchronized_clocks = 1;
 413             i.timestamp = remote;
 414         } else {
 415             /* clocks are not synchronized, let's estimate latency then */
 416             i.transport_usec = pa_timeval_diff(&now, &local)/2;
 417             i.synchronized_clocks = 0;
 418             i.timestamp = local;
 419             pa_timeval_add(&i.timestamp, i.transport_usec);
 420         }
 421
 422         if (o->stream->interpolate) {
 423             o->stream->ipol_timestamp = i.timestamp;
 424             o->stream->ipol_usec = pa_stream_get_time(o->stream, &i);
 425         }
 426
 427         p = &i;
 428     }
 429
 430     if (o->callback) {
 431         void (*cb)(struct pa_stream *s, const struct pa_latency_info *i, void *userdata) = o->callback;
 432         cb(o->stream, p, o->userdata);
 433     }
 434
 435 finish:
 436     pa_operation_done(o);
 437     pa_operation_unref(o);
 438 }
 439
 440 struct pa_operation* pa_stream_get_latency_info(struct pa_stream *s, void (*cb)(struct pa_stream *p, const struct pa_latency_info*i, void *userdata), void *userdata) {
 441     uint32_t tag;
 442     struct pa_operation *o;
 443     struct pa_tagstruct *t;
 444     struct timeval now;
 445     assert(s && s->direction != PA_STREAM_UPLOAD);
 446
 447     o = pa_operation_new(s->context, s);
 448     assert(o);
 449     o->callback = cb;
 450     o->userdata = userdata;
 451
 452     t = pa_tagstruct_new(NULL, 0);
 453     assert(t);
 454     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_GET_PLAYBACK_LATENCY : PA_COMMAND_GET_RECORD_LATENCY);
 455     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 456     pa_tagstruct_putu32(t, s->channel);
 457
 458     gettimeofday(&now, NULL);
 459     pa_tagstruct_put_timeval(t, &now);
 460     pa_tagstruct_putu64(t, s->counter);
 461
 462     pa_pstream_send_tagstruct(s->context->pstream, t);
 463     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_latency_info_callback, o);
 464
 465     return pa_operation_ref(o);
 466 }
 467
 468 void pa_stream_disconnect_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 469     struct pa_stream *s = userdata;
 470     assert(pd && s && s->ref >= 1);
 471
 472     pa_stream_ref(s);
 473
 474     if (command != PA_COMMAND_REPLY) {
 475         if (pa_context_handle_error(s->context, command, t) < 0)
 476             goto finish;
 477
 478         pa_stream_set_state(s, PA_STREAM_FAILED);
 479         goto finish;
 480     } else if (!pa_tagstruct_eof(t)) {
 481         pa_context_fail(s->context, PA_ERROR_PROTOCOL);
 482         goto finish;
 483     }
 484
 485     pa_stream_set_state(s, PA_STREAM_TERMINATED);
 486
 487 finish:
 488     pa_stream_unref(s);
 489 }
 490
 491 void pa_stream_disconnect(struct pa_stream *s) {
 492     struct pa_tagstruct *t;
 493     uint32_t tag;
 494     assert(s && s->ref >= 1);
 495
 496     if (!s->channel_valid || !s->context->state == PA_CONTEXT_READY)
 497         return;
 498
 499     pa_stream_ref(s);
 500
 501     t = pa_tagstruct_new(NULL, 0);
 502     assert(t);
 503
 504     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_DELETE_PLAYBACK_STREAM :
 505                         (s->direction == PA_STREAM_RECORD ? PA_COMMAND_DELETE_RECORD_STREAM : PA_COMMAND_DELETE_UPLOAD_STREAM));
 506     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 507     pa_tagstruct_putu32(t, s->channel);
 508     pa_pstream_send_tagstruct(s->context->pstream, t);
 509     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_disconnect_callback, s);
 510
 511     pa_stream_unref(s);
 512 }
 513
 514 void pa_stream_set_read_callback(struct pa_stream *s, void (*cb)(struct pa_stream *p, const void*data, size_t length, void *userdata), void *userdata) {
 515     assert(s && s->ref >= 1);
 516     s->read_callback = cb;
 517     s->read_userdata = userdata;
 518 }
 519
 520 void pa_stream_set_write_callback(struct pa_stream *s, void (*cb)(struct pa_stream *p, size_t length, void *userdata), void *userdata) {
 521     assert(s && s->ref >= 1);
 522     s->write_callback = cb;
 523     s->write_userdata = userdata;
 524 }
 525
 526 void pa_stream_set_state_callback(struct pa_stream *s, void (*cb)(struct pa_stream *s, void *userdata), void *userdata) {
 527     assert(s && s->ref >= 1);
 528     s->state_callback = cb;
 529     s->state_userdata = userdata;
 530 }
 531
 532 void pa_stream_simple_ack_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 533     struct pa_operation *o = userdata;
 534     int success = 1;
 535     assert(pd && o && o->context && o->ref >= 1);
 536
 537     if (command != PA_COMMAND_REPLY) {
 538         if (pa_context_handle_error(o->context, command, t) < 0)
 539             goto finish;
 540
 541         success = 0;
 542     } else if (!pa_tagstruct_eof(t)) {
 543         pa_context_fail(o->context, PA_ERROR_PROTOCOL);
 544         goto finish;
 545     }
 546
 547     if (o->callback) {
 548         void (*cb)(struct pa_stream *s, int success, void *userdata) = o->callback;
 549         cb(o->stream, success, o->userdata);
 550     }
 551
 552 finish:
 553     pa_operation_done(o);
 554     pa_operation_unref(o);
 555 }
 556
 557 struct pa_operation* pa_stream_cork(struct pa_stream *s, int b, void (*cb) (struct pa_stream*s, int success, void *userdata), void *userdata) {
 558     struct pa_operation *o;
 559     struct pa_tagstruct *t;
 560     uint32_t tag;
 561     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY);
 562
 563     if (s->interpolate) {
 564             if (!s->corked && b)
 565                 s->ipol_usec = pa_stream_get_interpolated_time(s);
 566             else if (s->corked && !b)
 567                 gettimeofday(&s->ipol_timestamp, NULL);
 568     }
 569
 570     s->corked = b;
 571
 572     o = pa_operation_new(s->context, s);
 573     assert(o);
 574     o->callback = cb;
 575     o->userdata = userdata;
 576
 577     t = pa_tagstruct_new(NULL, 0);
 578     assert(t);
 579     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CORK_PLAYBACK_STREAM : PA_COMMAND_CORK_RECORD_STREAM);
 580     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 581     pa_tagstruct_putu32(t, s->channel);
 582     pa_tagstruct_put_boolean(t, !!b);
 583     pa_pstream_send_tagstruct(s->context->pstream, t);
 584     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 585
 586     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 587
 588     return pa_operation_ref(o);
 589 }
 590
 591 struct pa_operation* pa_stream_send_simple_command(struct pa_stream *s, uint32_t command, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 592     struct pa_tagstruct *t;
 593     struct pa_operation *o;
 594     uint32_t tag;
 595     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY);
 596
 597     o = pa_operation_new(s->context, s);
 598     o->callback = cb;
 599     o->userdata = userdata;
 600
 601     t = pa_tagstruct_new(NULL, 0);
 602     pa_tagstruct_putu32(t, command);
 603     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 604     pa_tagstruct_putu32(t, s->channel);
 605     pa_pstream_send_tagstruct(s->context->pstream, t);
 606     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 607
 608     return pa_operation_ref(o);
 609 }
 610
 611 struct pa_operation* pa_stream_flush(struct pa_stream *s, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 612     struct pa_operation *o;
 613     o = pa_stream_send_simple_command(s, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_FLUSH_PLAYBACK_STREAM : PA_COMMAND_FLUSH_RECORD_STREAM, cb, userdata);
 614     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 615     return o;
 616 }
 617
 618 struct pa_operation* pa_stream_prebuf(struct pa_stream *s, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 619     struct pa_operation *o;
 620     o = pa_stream_send_simple_command(s, PA_COMMAND_PREBUF_PLAYBACK_STREAM, cb, userdata);
 621     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 622     return o;
 623 }
 624
 625 struct pa_operation* pa_stream_trigger(struct pa_stream *s, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 626     struct pa_operation *o;
 627     o = pa_stream_send_simple_command(s, PA_COMMAND_TRIGGER_PLAYBACK_STREAM, cb, userdata);
 628     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 629     return o;
 630 }
 631
 632 struct pa_operation* pa_stream_set_name(struct pa_stream *s, const char *name, void(*cb)(struct pa_stream*c, int success,  void *userdata), void *userdata) {
 633     struct pa_operation *o;
 634     struct pa_tagstruct *t;
 635     uint32_t tag;
 636     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY && name && s->direction != PA_STREAM_UPLOAD);
 637
 638     o = pa_operation_new(s->context, s);
 639     assert(o);
 640     o->callback = cb;
 641     o->userdata = userdata;
 642
 643     t = pa_tagstruct_new(NULL, 0);
 644     assert(t);
 645     pa_tagstruct_putu32(t, s->direction == PA_STREAM_RECORD ? PA_COMMAND_SET_RECORD_STREAM_NAME : PA_COMMAND_SET_PLAYBACK_STREAM_NAME);
 646     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 647     pa_tagstruct_putu32(t, s->channel);
 648     pa_tagstruct_puts(t, name);
 649     pa_pstream_send_tagstruct(s->context->pstream, t);
 650     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 651
 652     return pa_operation_ref(o);
 653 }
 654
 655 uint64_t pa_stream_get_counter(struct pa_stream *s) {
 656     assert(s);
 657     return s->counter;
 658 }
 659
 660 pa_usec_t pa_stream_get_time(struct pa_stream *s, const struct pa_latency_info *i) {
 661     pa_usec_t usec;
 662     assert(s);
 663
 664     usec = pa_bytes_to_usec(i->counter, &s->sample_spec);
 665
 666     if (i) {
 667         if (s->direction == PA_STREAM_PLAYBACK) {
 668             pa_usec_t latency = i->transport_usec + i->buffer_usec + i->sink_usec;
 669             if (usec < latency)
 670                 usec = 0;
 671             else
 672                 usec -= latency;
 673
 674         } else if (s->direction == PA_STREAM_RECORD) {
 675             usec += i->source_usec + i->buffer_usec + i->transport_usec;
 676
 677             if (usec > i->sink_usec)
 678                 usec -= i->sink_usec;
 679             else
 680                 usec = 0;
 681         }
 682     }
 683
 684     if (usec < s->previous_time)
 685         usec = s->previous_time;
 686
 687     s->previous_time = usec;
 688
 689     return usec;
 690 }
 691
 692 static pa_usec_t time_counter_diff(struct pa_stream *s, pa_usec_t t, pa_usec_t c, int *negative) {
 693     assert(s);
 694
 695     if (negative)
 696         *negative = 0;
 697
 698     if (c < t) {
 699         if (s->direction == PA_STREAM_RECORD) {
 700             if (negative)
 701                 *negative = 1;
 702
 703             return t-c;
 704         } else
 705             return 0;
 706     } else
 707         return c-t;
 708 }
 709
 710 pa_usec_t pa_stream_get_latency(struct pa_stream *s, const struct pa_latency_info *i, int *negative) {
 711     pa_usec_t t, c;
 712     assert(s && i);
 713
 714     t = pa_stream_get_time(s, i);
 715     c = pa_bytes_to_usec(s->counter, &s->sample_spec);
 716
 717     return time_counter_diff(s, t, c, negative);
 718 }
 719
 720 const struct pa_sample_spec* pa_stream_get_sample_spec(struct pa_stream *s) {
 721     assert(s);
 722     return &s->sample_spec;
 723 }
 724
 725 void pa_stream_trash_ipol(struct pa_stream *s) {
 726     assert(s);
 727
 728     if (!s->interpolate)
 729         return;
 730
 731     memset(&s->ipol_timestamp, 0, sizeof(s->ipol_timestamp));
 732     s->ipol_usec = 0;
 733 }
 734
 735 pa_usec_t pa_stream_get_interpolated_time(struct pa_stream *s) {
 736     pa_usec_t usec;
 737     assert(s && s->interpolate);
 738
 739     if (s->corked)
 740         usec = s->ipol_usec;
 741     else {
 742         if (s->ipol_timestamp.tv_sec == 0)
 743             usec = 0;
 744         else
 745             usec = s->ipol_usec + pa_timeval_age(&s->ipol_timestamp);
 746     }
 747
 748     if (usec < s->previous_time)
 749         usec = s->previous_time;
 750
 751     s->previous_time = usec;
 752     return usec;
 753 }
 754
 755 pa_usec_t pa_stream_get_interpolated_latency(struct pa_stream *s, int *negative) {
 756     pa_usec_t t, c;
 757     assert(s && s->interpolate);
 758
 759     t = pa_stream_get_interpolated_time(s);
 760     c = pa_bytes_to_usec(s->counter, &s->sample_spec);
 761
 762     return time_counter_diff(s, t, c, negative);
 763 }