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 #include "log.h"
  36
  37 #define LATENCY_IPOL_INTERVAL_USEC (10000L)
  38
  39 struct pa_stream *pa_stream_new(struct pa_context *c, const char *name, const struct pa_sample_spec *ss) {
  40     struct pa_stream *s;
  41     assert(c && ss);
  42
  43     s = pa_xmalloc(sizeof(struct pa_stream));
  44     s->ref = 1;
  45     s->context = c;
  46     s->mainloop = c->mainloop;
  47
  48     s->read_callback = NULL;
  49     s->read_userdata = NULL;
  50     s->write_callback = NULL;
  51     s->write_userdata = NULL;
  52     s->state_callback = NULL;
  53     s->state_userdata = NULL;
  54
  55     s->direction = PA_STREAM_NODIRECTION;
  56     s->name = pa_xstrdup(name);
  57     s->sample_spec = *ss;
  58     s->channel = 0;
  59     s->channel_valid = 0;
  60     s->device_index = PA_INVALID_INDEX;
  61     s->requested_bytes = 0;
  62     s->state = PA_STREAM_DISCONNECTED;
  63     memset(&s->buffer_attr, 0, sizeof(s->buffer_attr));
  64
  65     s->mcalign = pa_mcalign_new(pa_frame_size(ss), c->memblock_stat);
  66
  67     s->counter = 0;
  68     s->previous_time = 0;
  69     s->previous_ipol_time = 0;
  70
  71     s->corked = 0;
  72     s->interpolate = 0;
  73
  74     s->ipol_usec = 0;
  75     memset(&s->ipol_timestamp, 0, sizeof(s->ipol_timestamp));
  76     s->ipol_event = NULL;
  77     s->ipol_requested = 0;
  78
  79     PA_LLIST_PREPEND(struct pa_stream, c->streams, s);
  80
  81     return pa_stream_ref(s);
  82 }
  83
  84 static void stream_free(struct pa_stream *s) {
  85     assert(s);
  86
  87     if (s->ipol_event) {
  88         assert(s->mainloop);
  89         s->mainloop->time_free(s->ipol_event);
  90     }
  91
  92     pa_mcalign_free(s->mcalign);
  93
  94     pa_xfree(s->name);
  95     pa_xfree(s);
  96 }
  97
  98 void pa_stream_unref(struct pa_stream *s) {
  99     assert(s && s->ref >= 1);
 100
 101     if (--(s->ref) == 0)
 102         stream_free(s);
 103 }
 104
 105 struct pa_stream* pa_stream_ref(struct pa_stream *s) {
 106     assert(s && s->ref >= 1);
 107     s->ref++;
 108     return s;
 109 }
 110
 111 enum pa_stream_state pa_stream_get_state(struct pa_stream *s) {
 112     assert(s && s->ref >= 1);
 113     return s->state;
 114 }
 115
 116 struct pa_context* pa_stream_get_context(struct pa_stream *s) {
 117     assert(s && s->ref >= 1);
 118     return s->context;
 119 }
 120
 121 uint32_t pa_stream_get_index(struct pa_stream *s) {
 122     assert(s && s->ref >= 1);
 123     return s->device_index;
 124 }
 125
 126 void pa_stream_set_state(struct pa_stream *s, enum pa_stream_state st) {
 127     assert(s && s->ref >= 1);
 128
 129     if (s->state == st)
 130         return;
 131
 132     pa_stream_ref(s);
 133
 134     s->state = st;
 135
 136     if ((st == PA_STREAM_FAILED || st == PA_STREAM_TERMINATED) && s->context) {
 137         if (s->channel_valid)
 138             pa_dynarray_put((s->direction == PA_STREAM_PLAYBACK) ? s->context->playback_streams : s->context->record_streams, s->channel, NULL);
 139
 140         PA_LLIST_REMOVE(struct pa_stream, s->context->streams, s);
 141         pa_stream_unref(s);
 142     }
 143
 144     if (s->state_callback)
 145         s->state_callback(s, s->state_userdata);
 146
 147     pa_stream_unref(s);
 148 }
 149
 150 void pa_command_stream_killed(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 151     struct pa_context *c = userdata;
 152     struct pa_stream *s;
 153     uint32_t channel;
 154     assert(pd && (command == PA_COMMAND_PLAYBACK_STREAM_KILLED || command == PA_COMMAND_RECORD_STREAM_KILLED) && t && c);
 155
 156     pa_context_ref(c);
 157
 158     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 159         !pa_tagstruct_eof(t)) {
 160         pa_context_fail(c, PA_ERROR_PROTOCOL);
 161         goto finish;
 162     }
 163
 164     if (!(s = pa_dynarray_get(command == PA_COMMAND_PLAYBACK_STREAM_KILLED ? c->playback_streams : c->record_streams, channel)))
 165         goto finish;
 166
 167     c->error = PA_ERROR_KILLED;
 168     pa_stream_set_state(s, PA_STREAM_FAILED);
 169
 170 finish:
 171     pa_context_unref(c);
 172 }
 173
 174 void pa_command_request(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 175     struct pa_stream *s;
 176     struct pa_context *c = userdata;
 177     uint32_t bytes, channel;
 178     assert(pd && command == PA_COMMAND_REQUEST && t && c);
 179
 180     pa_context_ref(c);
 181
 182     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 183         pa_tagstruct_getu32(t, &bytes) < 0 ||
 184         !pa_tagstruct_eof(t)) {
 185         pa_context_fail(c, PA_ERROR_PROTOCOL);
 186         goto finish;
 187     }
 188
 189     if (!(s = pa_dynarray_get(c->playback_streams, channel)))
 190         goto finish;
 191
 192     if (s->state != PA_STREAM_READY)
 193         goto finish;
 194
 195     pa_stream_ref(s);
 196
 197     s->requested_bytes += bytes;
 198
 199     if (s->requested_bytes && s->write_callback)
 200         s->write_callback(s, s->requested_bytes, s->write_userdata);
 201
 202     pa_stream_unref(s);
 203
 204 finish:
 205     pa_context_unref(c);
 206 }
 207
 208 static void ipol_callback(struct pa_mainloop_api *m, struct pa_time_event *e, const struct timeval *tv, void *userdata) {
 209     struct timeval tv2;
 210     struct pa_stream *s = userdata;
 211
 212     pa_stream_ref(s);
 213
 214 /*     pa_log("requesting new ipol data\n"); */
 215
 216     if (s->state == PA_STREAM_READY && !s->ipol_requested) {
 217         pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 218         s->ipol_requested = 1;
 219     }
 220
 221     pa_gettimeofday(&tv2);
 222     pa_timeval_add(&tv2, LATENCY_IPOL_INTERVAL_USEC);
 223
 224     m->time_restart(e, &tv2);
 225
 226     pa_stream_unref(s);
 227 }
 228
 229
 230 void pa_create_stream_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 231     struct pa_stream *s = userdata;
 232     assert(pd && s && s->state == PA_STREAM_CREATING);
 233
 234     pa_stream_ref(s);
 235
 236     if (command != PA_COMMAND_REPLY) {
 237         if (pa_context_handle_error(s->context, command, t) < 0)
 238             goto finish;
 239
 240         pa_stream_set_state(s, PA_STREAM_FAILED);
 241         goto finish;
 242     }
 243
 244     if (pa_tagstruct_getu32(t, &s->channel) < 0 ||
 245         ((s->direction != PA_STREAM_UPLOAD) && pa_tagstruct_getu32(t, &s->device_index) < 0) ||
 246         ((s->direction != PA_STREAM_RECORD) && pa_tagstruct_getu32(t, &s->requested_bytes) < 0) ||
 247         !pa_tagstruct_eof(t)) {
 248         pa_context_fail(s->context, PA_ERROR_PROTOCOL);
 249         goto finish;
 250     }
 251
 252     s->channel_valid = 1;
 253     pa_dynarray_put((s->direction == PA_STREAM_RECORD) ? s->context->record_streams : s->context->playback_streams, s->channel, s);
 254     pa_stream_set_state(s, PA_STREAM_READY);
 255
 256     if (s->interpolate) {
 257         struct timeval tv;
 258         pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 259
 260         pa_gettimeofday(&tv);
 261         tv.tv_usec += LATENCY_IPOL_INTERVAL_USEC; /* every 100 ms */
 262
 263         assert(!s->ipol_event);
 264         s->ipol_event = s->mainloop->time_new(s->mainloop, &tv, &ipol_callback, s);
 265     }
 266
 267     if (s->requested_bytes && s->ref > 1 && s->write_callback)
 268         s->write_callback(s, s->requested_bytes, s->write_userdata);
 269
 270 finish:
 271     pa_stream_unref(s);
 272 }
 273
 274 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) {
 275     struct pa_tagstruct *t;
 276     uint32_t tag;
 277     assert(s && s->ref >= 1 && s->state == PA_STREAM_DISCONNECTED);
 278
 279     pa_stream_ref(s);
 280
 281     s->interpolate = !!(flags & PA_STREAM_INTERPOLATE_LATENCY);
 282     pa_stream_trash_ipol(s);
 283
 284     if (attr)
 285         s->buffer_attr = *attr;
 286     else {
 287         /* half a second */
 288         s->buffer_attr.tlength = pa_bytes_per_second(&s->sample_spec)/2;
 289         s->buffer_attr.maxlength = (s->buffer_attr.tlength*3)/2;
 290         s->buffer_attr.minreq = s->buffer_attr.tlength/100;
 291         s->buffer_attr.prebuf = s->buffer_attr.tlength - s->buffer_attr.minreq;
 292         s->buffer_attr.fragsize = s->buffer_attr.tlength/100;
 293     }
 294
 295     pa_stream_set_state(s, PA_STREAM_CREATING);
 296
 297     t = pa_tagstruct_new(NULL, 0);
 298     assert(t);
 299
 300     if (!dev) {
 301         if (s->direction == PA_STREAM_PLAYBACK)
 302             dev = s->context->conf->default_sink;
 303         else
 304             dev = s->context->conf->default_source;
 305     }
 306
 307     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CREATE_PLAYBACK_STREAM : PA_COMMAND_CREATE_RECORD_STREAM);
 308     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 309     pa_tagstruct_puts(t, s->name);
 310     pa_tagstruct_put_sample_spec(t, &s->sample_spec);
 311     pa_tagstruct_putu32(t, PA_INVALID_INDEX);
 312     pa_tagstruct_puts(t, dev);
 313     pa_tagstruct_putu32(t, s->buffer_attr.maxlength);
 314     pa_tagstruct_put_boolean(t, !!(flags & PA_STREAM_START_CORKED));
 315     if (s->direction == PA_STREAM_PLAYBACK) {
 316         pa_tagstruct_putu32(t, s->buffer_attr.tlength);
 317         pa_tagstruct_putu32(t, s->buffer_attr.prebuf);
 318         pa_tagstruct_putu32(t, s->buffer_attr.minreq);
 319         pa_tagstruct_putu32(t, volume);
 320     } else
 321         pa_tagstruct_putu32(t, s->buffer_attr.fragsize);
 322
 323     pa_pstream_send_tagstruct(s->context->pstream, t);
 324     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_create_stream_callback, s);
 325
 326     pa_stream_unref(s);
 327 }
 328
 329 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) {
 330     assert(s && s->context->state == PA_CONTEXT_READY && s->ref >= 1);
 331     s->direction = PA_STREAM_PLAYBACK;
 332     create_stream(s, dev, attr, flags, volume);
 333 }
 334
 335 void pa_stream_connect_record(struct pa_stream *s, const char *dev, const struct pa_buffer_attr *attr, enum pa_stream_flags flags) {
 336     assert(s && s->context->state == PA_CONTEXT_READY && s->ref >= 1);
 337     s->direction = PA_STREAM_RECORD;
 338     create_stream(s, dev, attr, flags, 0);
 339 }
 340
 341 void pa_stream_write(struct pa_stream *s, const void *data, size_t length, void (*free_cb)(void *p), size_t delta) {
 342     struct pa_memchunk chunk;
 343     assert(s && s->context && data && length && s->state == PA_STREAM_READY && s->ref >= 1);
 344
 345     if (free_cb) {
 346         chunk.memblock = pa_memblock_new_user((void*) data, length, free_cb, 1, s->context->memblock_stat);
 347         assert(chunk.memblock && chunk.memblock->data);
 348     } else {
 349         chunk.memblock = pa_memblock_new(length, s->context->memblock_stat);
 350         assert(chunk.memblock && chunk.memblock->data);
 351         memcpy(chunk.memblock->data, data, length);
 352     }
 353     chunk.index = 0;
 354     chunk.length = length;
 355
 356     pa_pstream_send_memblock(s->context->pstream, s->channel, delta, &chunk);
 357     pa_memblock_unref(chunk.memblock);
 358
 359     if (length < s->requested_bytes)
 360         s->requested_bytes -= length;
 361     else
 362         s->requested_bytes = 0;
 363
 364     s->counter += length;
 365 }
 366
 367 size_t pa_stream_writable_size(struct pa_stream *s) {
 368     assert(s && s->ref >= 1);
 369     return s->state == PA_STREAM_READY ? s->requested_bytes : 0;
 370 }
 371
 372 struct pa_operation * pa_stream_drain(struct pa_stream *s, void (*cb) (struct pa_stream*s, int success, void *userdata), void *userdata) {
 373     struct pa_operation *o;
 374     struct pa_tagstruct *t;
 375     uint32_t tag;
 376     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY);
 377
 378     o = pa_operation_new(s->context, s);
 379     assert(o);
 380     o->callback = cb;
 381     o->userdata = userdata;
 382
 383     t = pa_tagstruct_new(NULL, 0);
 384     assert(t);
 385     pa_tagstruct_putu32(t, PA_COMMAND_DRAIN_PLAYBACK_STREAM);
 386     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 387     pa_tagstruct_putu32(t, s->channel);
 388     pa_pstream_send_tagstruct(s->context->pstream, t);
 389     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 390
 391     return pa_operation_ref(o);
 392 }
 393
 394 static void stream_get_latency_info_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 395     struct pa_operation *o = userdata;
 396     struct pa_latency_info i, *p = NULL;
 397     struct timeval local, remote, now;
 398     assert(pd && o && o->stream && o->context);
 399
 400     if (command != PA_COMMAND_REPLY) {
 401         if (pa_context_handle_error(o->context, command, t) < 0)
 402             goto finish;
 403
 404     } else if (pa_tagstruct_get_usec(t, &i.buffer_usec) < 0 ||
 405                pa_tagstruct_get_usec(t, &i.sink_usec) < 0 ||
 406                pa_tagstruct_get_usec(t, &i.source_usec) < 0 ||
 407                pa_tagstruct_get_boolean(t, &i.playing) < 0 ||
 408                pa_tagstruct_getu32(t, &i.queue_length) < 0 ||
 409                pa_tagstruct_get_timeval(t, &local) < 0 ||
 410                pa_tagstruct_get_timeval(t, &remote) < 0 ||
 411                pa_tagstruct_getu64(t, &i.counter) < 0 ||
 412                !pa_tagstruct_eof(t)) {
 413         pa_context_fail(o->context, PA_ERROR_PROTOCOL);
 414         goto finish;
 415     } else {
 416         pa_gettimeofday(&now);
 417
 418         if (pa_timeval_cmp(&local, &remote) <= 0 && pa_timeval_cmp(&remote, &now) <= 0) {
 419             /* local and remote seem to have synchronized clocks */
 420
 421             if (o->stream->direction == PA_STREAM_PLAYBACK)
 422                 i.transport_usec = pa_timeval_diff(&remote, &local);
 423             else
 424                 i.transport_usec = pa_timeval_diff(&now, &remote);
 425
 426             i.synchronized_clocks = 1;
 427             i.timestamp = remote;
 428         } else {
 429             /* clocks are not synchronized, let's estimate latency then */
 430             i.transport_usec = pa_timeval_diff(&now, &local)/2;
 431             i.synchronized_clocks = 0;
 432             i.timestamp = local;
 433             pa_timeval_add(&i.timestamp, i.transport_usec);
 434         }
 435
 436         if (o->stream->interpolate) {
 437 /*              pa_log("new interpol data\n");  */
 438             o->stream->ipol_timestamp = i.timestamp;
 439             o->stream->ipol_usec = pa_stream_get_time(o->stream, &i);
 440             o->stream->ipol_requested = 0;
 441         }
 442
 443         p = &i;
 444     }
 445
 446     if (o->callback) {
 447         void (*cb)(struct pa_stream *s, const struct pa_latency_info *i, void *userdata) = o->callback;
 448         cb(o->stream, p, o->userdata);
 449     }
 450
 451 finish:
 452     pa_operation_done(o);
 453     pa_operation_unref(o);
 454 }
 455
 456 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) {
 457     uint32_t tag;
 458     struct pa_operation *o;
 459     struct pa_tagstruct *t;
 460     struct timeval now;
 461     assert(s && s->direction != PA_STREAM_UPLOAD);
 462
 463     o = pa_operation_new(s->context, s);
 464     assert(o);
 465     o->callback = cb;
 466     o->userdata = userdata;
 467
 468     t = pa_tagstruct_new(NULL, 0);
 469     assert(t);
 470     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_GET_PLAYBACK_LATENCY : PA_COMMAND_GET_RECORD_LATENCY);
 471     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 472     pa_tagstruct_putu32(t, s->channel);
 473
 474     pa_gettimeofday(&now);
 475     pa_tagstruct_put_timeval(t, &now);
 476     pa_tagstruct_putu64(t, s->counter);
 477
 478     pa_pstream_send_tagstruct(s->context->pstream, t);
 479     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_latency_info_callback, o);
 480
 481     return pa_operation_ref(o);
 482 }
 483
 484 void pa_stream_disconnect_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 485     struct pa_stream *s = userdata;
 486     assert(pd && s && s->ref >= 1);
 487
 488     pa_stream_ref(s);
 489
 490     if (command != PA_COMMAND_REPLY) {
 491         if (pa_context_handle_error(s->context, command, t) < 0)
 492             goto finish;
 493
 494         pa_stream_set_state(s, PA_STREAM_FAILED);
 495         goto finish;
 496     } else if (!pa_tagstruct_eof(t)) {
 497         pa_context_fail(s->context, PA_ERROR_PROTOCOL);
 498         goto finish;
 499     }
 500
 501     pa_stream_set_state(s, PA_STREAM_TERMINATED);
 502
 503 finish:
 504     pa_stream_unref(s);
 505 }
 506
 507 void pa_stream_disconnect(struct pa_stream *s) {
 508     struct pa_tagstruct *t;
 509     uint32_t tag;
 510     assert(s && s->ref >= 1);
 511
 512     if (!s->channel_valid || !s->context->state == PA_CONTEXT_READY)
 513         return;
 514
 515     pa_stream_ref(s);
 516
 517     t = pa_tagstruct_new(NULL, 0);
 518     assert(t);
 519
 520     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_DELETE_PLAYBACK_STREAM :
 521                         (s->direction == PA_STREAM_RECORD ? PA_COMMAND_DELETE_RECORD_STREAM : PA_COMMAND_DELETE_UPLOAD_STREAM));
 522     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 523     pa_tagstruct_putu32(t, s->channel);
 524     pa_pstream_send_tagstruct(s->context->pstream, t);
 525     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_disconnect_callback, s);
 526
 527     pa_stream_unref(s);
 528 }
 529
 530 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) {
 531     assert(s && s->ref >= 1);
 532     s->read_callback = cb;
 533     s->read_userdata = userdata;
 534 }
 535
 536 void pa_stream_set_write_callback(struct pa_stream *s, void (*cb)(struct pa_stream *p, size_t length, void *userdata), void *userdata) {
 537     assert(s && s->ref >= 1);
 538     s->write_callback = cb;
 539     s->write_userdata = userdata;
 540 }
 541
 542 void pa_stream_set_state_callback(struct pa_stream *s, void (*cb)(struct pa_stream *s, void *userdata), void *userdata) {
 543     assert(s && s->ref >= 1);
 544     s->state_callback = cb;
 545     s->state_userdata = userdata;
 546 }
 547
 548 void pa_stream_simple_ack_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 549     struct pa_operation *o = userdata;
 550     int success = 1;
 551     assert(pd && o && o->context && o->ref >= 1);
 552
 553     if (command != PA_COMMAND_REPLY) {
 554         if (pa_context_handle_error(o->context, command, t) < 0)
 555             goto finish;
 556
 557         success = 0;
 558     } else if (!pa_tagstruct_eof(t)) {
 559         pa_context_fail(o->context, PA_ERROR_PROTOCOL);
 560         goto finish;
 561     }
 562
 563     if (o->callback) {
 564         void (*cb)(struct pa_stream *s, int success, void *userdata) = o->callback;
 565         cb(o->stream, success, o->userdata);
 566     }
 567
 568 finish:
 569     pa_operation_done(o);
 570     pa_operation_unref(o);
 571 }
 572
 573 struct pa_operation* pa_stream_cork(struct pa_stream *s, int b, void (*cb) (struct pa_stream*s, int success, void *userdata), void *userdata) {
 574     struct pa_operation *o;
 575     struct pa_tagstruct *t;
 576     uint32_t tag;
 577     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY);
 578
 579     if (s->interpolate) {
 580         if (!s->corked && b)
 581             /* Pausing */
 582             s->ipol_usec = pa_stream_get_interpolated_time(s);
 583         else if (s->corked && !b)
 584             /* Unpausing */
 585             pa_gettimeofday(&s->ipol_timestamp);
 586     }
 587
 588     s->corked = b;
 589
 590     o = pa_operation_new(s->context, s);
 591     assert(o);
 592     o->callback = cb;
 593     o->userdata = userdata;
 594
 595     t = pa_tagstruct_new(NULL, 0);
 596     assert(t);
 597     pa_tagstruct_putu32(t, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CORK_PLAYBACK_STREAM : PA_COMMAND_CORK_RECORD_STREAM);
 598     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 599     pa_tagstruct_putu32(t, s->channel);
 600     pa_tagstruct_put_boolean(t, !!b);
 601     pa_pstream_send_tagstruct(s->context->pstream, t);
 602     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 603
 604     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 605
 606     return pa_operation_ref(o);
 607 }
 608
 609 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) {
 610     struct pa_tagstruct *t;
 611     struct pa_operation *o;
 612     uint32_t tag;
 613     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY);
 614
 615     o = pa_operation_new(s->context, s);
 616     o->callback = cb;
 617     o->userdata = userdata;
 618
 619     t = pa_tagstruct_new(NULL, 0);
 620     pa_tagstruct_putu32(t, command);
 621     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 622     pa_tagstruct_putu32(t, s->channel);
 623     pa_pstream_send_tagstruct(s->context->pstream, t);
 624     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 625
 626     return pa_operation_ref(o);
 627 }
 628
 629 struct pa_operation* pa_stream_flush(struct pa_stream *s, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 630     struct pa_operation *o;
 631     o = pa_stream_send_simple_command(s, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_FLUSH_PLAYBACK_STREAM : PA_COMMAND_FLUSH_RECORD_STREAM, cb, userdata);
 632     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 633     return o;
 634 }
 635
 636 struct pa_operation* pa_stream_prebuf(struct pa_stream *s, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 637     struct pa_operation *o;
 638     o = pa_stream_send_simple_command(s, PA_COMMAND_PREBUF_PLAYBACK_STREAM, cb, userdata);
 639     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 640     return o;
 641 }
 642
 643 struct pa_operation* pa_stream_trigger(struct pa_stream *s, void (*cb)(struct pa_stream *s, int success, void *userdata), void *userdata) {
 644     struct pa_operation *o;
 645     o = pa_stream_send_simple_command(s, PA_COMMAND_TRIGGER_PLAYBACK_STREAM, cb, userdata);
 646     pa_operation_unref(pa_stream_get_latency_info(s, NULL, NULL));
 647     return o;
 648 }
 649
 650 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) {
 651     struct pa_operation *o;
 652     struct pa_tagstruct *t;
 653     uint32_t tag;
 654     assert(s && s->ref >= 1 && s->state == PA_STREAM_READY && name && s->direction != PA_STREAM_UPLOAD);
 655
 656     o = pa_operation_new(s->context, s);
 657     assert(o);
 658     o->callback = cb;
 659     o->userdata = userdata;
 660
 661     t = pa_tagstruct_new(NULL, 0);
 662     assert(t);
 663     pa_tagstruct_putu32(t, s->direction == PA_STREAM_RECORD ? PA_COMMAND_SET_RECORD_STREAM_NAME : PA_COMMAND_SET_PLAYBACK_STREAM_NAME);
 664     pa_tagstruct_putu32(t, tag = s->context->ctag++);
 665     pa_tagstruct_putu32(t, s->channel);
 666     pa_tagstruct_puts(t, name);
 667     pa_pstream_send_tagstruct(s->context->pstream, t);
 668     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 669
 670     return pa_operation_ref(o);
 671 }
 672
 673 uint64_t pa_stream_get_counter(struct pa_stream *s) {
 674     assert(s);
 675     return s->counter;
 676 }
 677
 678 pa_usec_t pa_stream_get_time(struct pa_stream *s, const struct pa_latency_info *i) {
 679     pa_usec_t usec;
 680     assert(s);
 681
 682     usec = pa_bytes_to_usec(i->counter, &s->sample_spec);
 683
 684     if (i) {
 685         if (s->direction == PA_STREAM_PLAYBACK) {
 686             pa_usec_t latency = i->transport_usec + i->buffer_usec + i->sink_usec;
 687             if (usec < latency)
 688                 usec = 0;
 689             else
 690                 usec -= latency;
 691
 692         } else if (s->direction == PA_STREAM_RECORD) {
 693             usec += i->source_usec + i->buffer_usec + i->transport_usec;
 694
 695             if (usec > i->sink_usec)
 696                 usec -= i->sink_usec;
 697             else
 698                 usec = 0;
 699         }
 700     }
 701
 702     if (usec < s->previous_time)
 703         usec = s->previous_time;
 704
 705     s->previous_time = usec;
 706
 707     return usec;
 708 }
 709
 710 static pa_usec_t time_counter_diff(struct pa_stream *s, pa_usec_t t, pa_usec_t c, int *negative) {
 711     assert(s);
 712
 713     if (negative)
 714         *negative = 0;
 715
 716     if (c < t) {
 717         if (s->direction == PA_STREAM_RECORD) {
 718             if (negative)
 719                 *negative = 1;
 720
 721             return t-c;
 722         } else
 723             return 0;
 724     } else
 725         return c-t;
 726 }
 727
 728 pa_usec_t pa_stream_get_latency(struct pa_stream *s, const struct pa_latency_info *i, int *negative) {
 729     pa_usec_t t, c;
 730     assert(s && i);
 731
 732     t = pa_stream_get_time(s, i);
 733     c = pa_bytes_to_usec(s->counter, &s->sample_spec);
 734
 735     return time_counter_diff(s, t, c, negative);
 736 }
 737
 738 const struct pa_sample_spec* pa_stream_get_sample_spec(struct pa_stream *s) {
 739     assert(s);
 740     return &s->sample_spec;
 741 }
 742
 743 void pa_stream_trash_ipol(struct pa_stream *s) {
 744     assert(s);
 745
 746     if (!s->interpolate)
 747         return;
 748
 749     memset(&s->ipol_timestamp, 0, sizeof(s->ipol_timestamp));
 750     s->ipol_usec = 0;
 751 }
 752
 753 pa_usec_t pa_stream_get_interpolated_time(struct pa_stream *s) {
 754     pa_usec_t usec;
 755     assert(s && s->interpolate);
 756
 757     if (s->corked)
 758         usec = s->ipol_usec;
 759     else {
 760         if (s->ipol_timestamp.tv_sec == 0)
 761             usec = 0;
 762         else
 763             usec = s->ipol_usec + pa_timeval_age(&s->ipol_timestamp);
 764     }
 765
 766     if (usec < s->previous_ipol_time)
 767         usec = s->previous_ipol_time;
 768
 769     s->previous_ipol_time = usec;
 770
 771     return usec;
 772 }
 773
 774 pa_usec_t pa_stream_get_interpolated_latency(struct pa_stream *s, int *negative) {
 775     pa_usec_t t, c;
 776     assert(s && s->interpolate);
 777
 778     t = pa_stream_get_interpolated_time(s);
 779     c = pa_bytes_to_usec(s->counter, &s->sample_spec);
 780     return time_counter_diff(s, t, c, negative);
 781 }