code.delx.au - pulseaudio/blob - src/polyp/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 <polyp/def.h>
  32 #include <polypcore/xmalloc.h>
  33 #include <polypcore/pstream-util.h>
  34 #include <polypcore/util.h>
  35 #include <polypcore/log.h>
  36 #include <polypcore/hashmap.h>
  37
  38 #include "internal.h"
  39
  40 #define LATENCY_IPOL_INTERVAL_USEC (10000L)
  41
  42 pa_stream *pa_stream_new(pa_context *c, const char *name, const pa_sample_spec *ss, const pa_channel_map *map) {
  43     pa_stream *s;
  44     int i;
  45
  46     assert(c);
  47
  48     PA_CHECK_VALIDITY_RETURN_NULL(c, ss && pa_sample_spec_valid(ss), PA_ERR_INVALID);
  49     PA_CHECK_VALIDITY_RETURN_NULL(c, !map || (pa_channel_map_valid(map) && map->channels == ss->channels), PA_ERR_INVALID);
  50
  51     s = pa_xnew(pa_stream, 1);
  52     s->ref = 1;
  53     s->context = c;
  54     s->mainloop = c->mainloop;
  55
  56     s->read_callback = NULL;
  57     s->read_userdata = NULL;
  58     s->write_callback = NULL;
  59     s->write_userdata = NULL;
  60     s->state_callback = NULL;
  61     s->state_userdata = NULL;
  62     s->overflow_callback = NULL;
  63     s->overflow_userdata = NULL;
  64     s->underflow_callback = NULL;
  65     s->underflow_userdata = NULL;
  66
  67     s->direction = PA_STREAM_NODIRECTION;
  68     s->name = pa_xstrdup(name);
  69     s->sample_spec = *ss;
  70     s->flags = 0;
  71
  72     if (map)
  73         s->channel_map = *map;
  74     else
  75         pa_channel_map_init_auto(&s->channel_map, ss->channels);
  76
  77     s->channel = 0;
  78     s->channel_valid = 0;
  79     s->syncid = c->csyncid++;
  80     s->device_index = PA_INVALID_INDEX;
  81     s->requested_bytes = 0;
  82     s->state = PA_STREAM_UNCONNECTED;
  83     memset(&s->buffer_attr, 0, sizeof(s->buffer_attr));
  84
  85     s->peek_memchunk.index = 0;
  86     s->peek_memchunk.length = 0;
  87     s->peek_memchunk.memblock = NULL;
  88
  89     s->record_memblockq = NULL;
  90
  91     s->previous_time = 0;
  92     s->timing_info_valid = 0;
  93     s->read_index_not_before = 0;
  94     s->write_index_not_before = 0;
  95
  96     for (i = 0; i < PA_MAX_WRITE_INDEX_CORRECTIONS; i++)
  97         s->write_index_corrections[i].valid = 0;
  98     s->current_write_index_correction = 0;
  99
 100     s->corked = 0;
 101
 102     s->ipol_usec_valid = 0;
 103     s->ipol_timestamp.tv_sec = 0;
 104     s->ipol_timestamp.tv_usec = 0;
 105
 106     s->auto_timing_update_event = NULL;
 107     s->auto_timing_update_requested = 0;
 108
 109     PA_LLIST_PREPEND(pa_stream, c->streams, s);
 110
 111     /* The context and stream will point at each other. We cannot ref count
 112        both though since that will create a loop. */
 113     pa_context_ref(s->context);
 114
 115     return s;
 116 }
 117
 118 static void stream_free(pa_stream *s) {
 119     assert(s && s->context && !s->channel_valid);
 120
 121     PA_LLIST_REMOVE(pa_stream, s->context->streams, s);
 122
 123     pa_context_unref(s->context);
 124
 125     if (s->auto_timing_update_event) {
 126         assert(s->mainloop);
 127         s->mainloop->time_free(s->auto_timing_update_event);
 128     }
 129
 130     if (s->peek_memchunk.memblock)
 131         pa_memblock_unref(s->peek_memchunk.memblock);
 132
 133     if (s->record_memblockq)
 134         pa_memblockq_free(s->record_memblockq);
 135
 136     pa_xfree(s->name);
 137     pa_xfree(s);
 138 }
 139
 140 void pa_stream_unref(pa_stream *s) {
 141     assert(s);
 142     assert(s->ref >= 1);
 143
 144     if (--(s->ref) == 0)
 145         stream_free(s);
 146 }
 147
 148 pa_stream* pa_stream_ref(pa_stream *s) {
 149     assert(s);
 150     assert(s->ref >= 1);
 151
 152     s->ref++;
 153     return s;
 154 }
 155
 156 pa_stream_state_t pa_stream_get_state(pa_stream *s) {
 157     assert(s);
 158     assert(s->ref >= 1);
 159
 160     return s->state;
 161 }
 162
 163 pa_context* pa_stream_get_context(pa_stream *s) {
 164     assert(s);
 165     assert(s->ref >= 1);
 166
 167     return s->context;
 168 }
 169
 170 uint32_t pa_stream_get_index(pa_stream *s) {
 171     assert(s);
 172     assert(s->ref >= 1);
 173
 174     PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, PA_INVALID_INDEX);
 175
 176     return s->device_index;
 177 }
 178
 179 void pa_stream_set_state(pa_stream *s, pa_stream_state_t st) {
 180     assert(s);
 181     assert(s->ref >= 1);
 182
 183     if (s->state == st)
 184         return;
 185
 186     pa_stream_ref(s);
 187
 188     s->state = st;
 189
 190     if ((st == PA_STREAM_FAILED || st == PA_STREAM_TERMINATED) && s->context) {
 191         /* Detach from context */
 192
 193         if (s->channel_valid)
 194             pa_dynarray_put((s->direction == PA_STREAM_PLAYBACK) ? s->context->playback_streams : s->context->record_streams, s->channel, NULL);
 195
 196         s->channel = 0;
 197         s->channel_valid = 0;
 198
 199         /* We keep a ref as long as we're connected */
 200         pa_stream_unref(s);
 201     }
 202
 203     if (s->state_callback)
 204         s->state_callback(s, s->state_userdata);
 205
 206     pa_stream_unref(s);
 207 }
 208
 209 void pa_command_stream_killed(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 210     pa_context *c = userdata;
 211     pa_stream *s;
 212     uint32_t channel;
 213
 214     assert(pd);
 215     assert(command == PA_COMMAND_PLAYBACK_STREAM_KILLED || command == PA_COMMAND_RECORD_STREAM_KILLED);
 216     assert(t);
 217     assert(c);
 218
 219     pa_context_ref(c);
 220
 221     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 222         !pa_tagstruct_eof(t)) {
 223         pa_context_fail(c, PA_ERR_PROTOCOL);
 224         goto finish;
 225     }
 226
 227     if (!(s = pa_dynarray_get(command == PA_COMMAND_PLAYBACK_STREAM_KILLED ? c->playback_streams : c->record_streams, channel)))
 228         goto finish;
 229
 230     pa_context_set_error(c, PA_ERR_KILLED);
 231     pa_stream_set_state(s, PA_STREAM_FAILED);
 232
 233 finish:
 234     pa_context_unref(c);
 235 }
 236
 237 void pa_command_request(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 238     pa_stream *s;
 239     pa_context *c = userdata;
 240     uint32_t bytes, channel;
 241
 242     assert(pd);
 243     assert(command == PA_COMMAND_REQUEST);
 244     assert(t);
 245     assert(c);
 246
 247     pa_context_ref(c);
 248
 249     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 250         pa_tagstruct_getu32(t, &bytes) < 0 ||
 251         !pa_tagstruct_eof(t)) {
 252         pa_context_fail(c, PA_ERR_PROTOCOL);
 253         goto finish;
 254     }
 255
 256     if (!(s = pa_dynarray_get(c->playback_streams, channel)))
 257         goto finish;
 258
 259     if (s->state == PA_STREAM_READY) {
 260         s->requested_bytes += bytes;
 261
 262         if (s->requested_bytes > 0 && s->write_callback)
 263             s->write_callback(s, s->requested_bytes, s->write_userdata);
 264     }
 265
 266 finish:
 267     pa_context_unref(c);
 268 }
 269
 270 void pa_command_overflow_or_underflow(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 271     pa_stream *s;
 272     pa_context *c = userdata;
 273     uint32_t channel;
 274
 275     assert(pd);
 276     assert(command == PA_COMMAND_OVERFLOW || command == PA_COMMAND_UNDERFLOW);
 277     assert(t);
 278     assert(c);
 279
 280     pa_context_ref(c);
 281
 282     if (pa_tagstruct_getu32(t, &channel) < 0 ||
 283         !pa_tagstruct_eof(t)) {
 284         pa_context_fail(c, PA_ERR_PROTOCOL);
 285         goto finish;
 286     }
 287
 288     if (!(s = pa_dynarray_get(c->playback_streams, channel)))
 289         goto finish;
 290
 291     if (s->state == PA_STREAM_READY) {
 292
 293         if (command == PA_COMMAND_OVERFLOW) {
 294             if (s->overflow_callback)
 295                 s->overflow_callback(s, s->overflow_userdata);
 296         } else if (command == PA_COMMAND_UNDERFLOW) {
 297             if (s->underflow_callback)
 298                 s->underflow_callback(s, s->underflow_userdata);
 299         }
 300     }
 301
 302  finish:
 303     pa_context_unref(c);
 304 }
 305
 306 static void request_auto_timing_update(pa_stream *s, int force) {
 307     struct timeval next;
 308     assert(s);
 309
 310     if (!(s->flags & PA_STREAM_AUTO_TIMING_UPDATE))
 311         return;
 312
 313     if (s->state == PA_STREAM_READY &&
 314         (force || !s->auto_timing_update_requested)) {
 315         pa_operation *o;
 316
 317 /*         pa_log("automatically requesting new timing data");   */
 318
 319         if ((o = pa_stream_update_timing_info(s, NULL, NULL))) {
 320             pa_operation_unref(o);
 321             s->auto_timing_update_requested = 1;
 322         }
 323     }
 324
 325     pa_gettimeofday(&next);
 326     pa_timeval_add(&next, LATENCY_IPOL_INTERVAL_USEC);
 327     s->mainloop->time_restart(s->auto_timing_update_event, &next);
 328 }
 329
 330 static void invalidate_indexes(pa_stream *s, int r, int w) {
 331     assert(s);
 332
 333     pa_log("invalidate r:%u w:%u tag:%u", r, w, s->context->ctag);
 334
 335     if (s->state != PA_STREAM_READY)
 336         return;
 337
 338     if (w) {
 339         s->write_index_not_before = s->context->ctag;
 340
 341         if (s->timing_info_valid)
 342             s->timing_info.write_index_corrupt = 1;
 343
 344         pa_log("write_index invalidated");
 345
 346     }
 347
 348     if (r) {
 349         s->read_index_not_before = s->context->ctag;
 350
 351         if (s->timing_info_valid)
 352             s->timing_info.read_index_corrupt = 1;
 353
 354         pa_log("read_index invalidated");
 355     }
 356
 357     if ((s->direction == PA_STREAM_PLAYBACK && r) ||
 358         (s->direction == PA_STREAM_RECORD && w))
 359         s->ipol_usec_valid = 0;
 360
 361     request_auto_timing_update(s, 1);
 362 }
 363
 364 static void auto_timing_update_callback(pa_mainloop_api *m, pa_time_event *e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
 365     pa_stream *s = userdata;
 366
 367     pa_log("time event");
 368
 369     pa_stream_ref(s);
 370     request_auto_timing_update(s, 0);
 371     pa_stream_unref(s);
 372 }
 373
 374 void pa_create_stream_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 375     pa_stream *s = userdata;
 376
 377     assert(pd);
 378     assert(t);
 379     assert(s);
 380     assert(s->state == PA_STREAM_CREATING);
 381
 382     pa_stream_ref(s);
 383
 384     if (command != PA_COMMAND_REPLY) {
 385         if (pa_context_handle_error(s->context, command, t) < 0)
 386             goto finish;
 387
 388         pa_stream_set_state(s, PA_STREAM_FAILED);
 389         goto finish;
 390     }
 391
 392     if (pa_tagstruct_getu32(t, &s->channel) < 0 ||
 393         ((s->direction != PA_STREAM_UPLOAD) && pa_tagstruct_getu32(t, &s->device_index) < 0) ||
 394         ((s->direction != PA_STREAM_RECORD) && pa_tagstruct_getu32(t, &s->requested_bytes) < 0) ||
 395         !pa_tagstruct_eof(t)) {
 396         pa_context_fail(s->context, PA_ERR_PROTOCOL);
 397         goto finish;
 398     }
 399
 400     if (s->direction == PA_STREAM_RECORD) {
 401         assert(!s->record_memblockq);
 402
 403         s->record_memblockq = pa_memblockq_new(
 404                 0,
 405                 s->buffer_attr.maxlength,
 406                 0,
 407                 pa_frame_size(&s->sample_spec),
 408                 1,
 409                 0,
 410                 NULL,
 411                 s->context->memblock_stat);
 412     }
 413
 414     s->channel_valid = 1;
 415     pa_dynarray_put((s->direction == PA_STREAM_RECORD) ? s->context->record_streams : s->context->playback_streams, s->channel, s);
 416
 417     /* We add an extra ref as long as we're connected (i.e. in the dynarray) */
 418     pa_stream_ref(s);
 419
 420     pa_stream_set_state(s, PA_STREAM_READY);
 421
 422     if (s->direction != PA_STREAM_UPLOAD &&
 423         s->flags & PA_STREAM_AUTO_TIMING_UPDATE) {
 424         struct timeval tv;
 425
 426         pa_gettimeofday(&tv);
 427         tv.tv_usec += LATENCY_IPOL_INTERVAL_USEC; /* every 100 ms */
 428
 429         assert(!s->auto_timing_update_event);
 430         s->auto_timing_update_event = s->mainloop->time_new(s->mainloop, &tv, &auto_timing_update_callback, s);
 431
 432         request_auto_timing_update(s, 1);
 433     }
 434
 435     if (s->requested_bytes > 0 && s->ref > 1 && s->write_callback)
 436         s->write_callback(s, s->requested_bytes, s->write_userdata);
 437
 438 finish:
 439     pa_stream_unref(s);
 440 }
 441
 442 static int create_stream(
 443         pa_stream_direction_t direction,
 444         pa_stream *s,
 445         const char *dev,
 446         const pa_buffer_attr *attr,
 447         pa_stream_flags_t flags,
 448         const pa_cvolume *volume,
 449         pa_stream *sync_stream) {
 450
 451     pa_tagstruct *t;
 452     uint32_t tag;
 453
 454     assert(s);
 455     assert(s->ref >= 1);
 456
 457     PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_UNCONNECTED, PA_ERR_BADSTATE);
 458     PA_CHECK_VALIDITY(s->context, !(flags & ~((direction != PA_STREAM_UPLOAD ?
 459                                                PA_STREAM_START_CORKED|
 460                                                PA_STREAM_INTERPOLATE_TIMING|
 461                                                PA_STREAM_NOT_MONOTONOUS|
 462                                                PA_STREAM_AUTO_TIMING_UPDATE : 0))), PA_ERR_INVALID);
 463     PA_CHECK_VALIDITY(s->context, direction == PA_STREAM_PLAYBACK || flags == 0, PA_ERR_INVALID);
 464     PA_CHECK_VALIDITY(s->context, !volume || volume->channels == s->sample_spec.channels, PA_ERR_INVALID);
 465     PA_CHECK_VALIDITY(s->context, !sync_stream || (direction == PA_STREAM_PLAYBACK && sync_stream->direction == PA_STREAM_PLAYBACK), PA_ERR_INVALID);
 466
 467     pa_stream_ref(s);
 468
 469     s->direction = direction;
 470     s->flags = flags;
 471
 472     if (sync_stream)
 473         s->syncid = sync_stream->syncid;
 474
 475     if (attr)
 476         s->buffer_attr = *attr;
 477     else {
 478         /* half a second */
 479         s->buffer_attr.tlength = pa_bytes_per_second(&s->sample_spec)/2;
 480         s->buffer_attr.maxlength = (s->buffer_attr.tlength*3)/2;
 481         s->buffer_attr.minreq = s->buffer_attr.tlength/100;
 482         s->buffer_attr.prebuf = s->buffer_attr.tlength - s->buffer_attr.minreq;
 483         s->buffer_attr.fragsize = s->buffer_attr.tlength/100;
 484     }
 485
 486     if (!dev)
 487         dev = s->direction == PA_STREAM_PLAYBACK ? s->context->conf->default_sink : s->context->conf->default_source;
 488
 489     t = pa_tagstruct_command(
 490             s->context,
 491             s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CREATE_PLAYBACK_STREAM : PA_COMMAND_CREATE_RECORD_STREAM,
 492             &tag);
 493
 494     pa_tagstruct_put(
 495             t,
 496             PA_TAG_STRING, s->name,
 497             PA_TAG_SAMPLE_SPEC, &s->sample_spec,
 498             PA_TAG_CHANNEL_MAP, &s->channel_map,
 499             PA_TAG_U32, PA_INVALID_INDEX,
 500             PA_TAG_STRING, dev,
 501             PA_TAG_U32, s->buffer_attr.maxlength,
 502             PA_TAG_BOOLEAN, !!(flags & PA_STREAM_START_CORKED),
 503             PA_TAG_INVALID);
 504
 505     if (s->direction == PA_STREAM_PLAYBACK) {
 506         pa_cvolume cv;
 507
 508         pa_tagstruct_put(
 509                 t,
 510                 PA_TAG_U32, s->buffer_attr.tlength,
 511                 PA_TAG_U32, s->buffer_attr.prebuf,
 512                 PA_TAG_U32, s->buffer_attr.minreq,
 513                 PA_TAG_U32, s->syncid,
 514                 PA_TAG_INVALID);
 515
 516         if (!volume)
 517             volume = pa_cvolume_reset(&cv, s->sample_spec.channels);
 518
 519         pa_tagstruct_put_cvolume(t, volume);
 520     } else
 521         pa_tagstruct_putu32(t, s->buffer_attr.fragsize);
 522
 523     pa_pstream_send_tagstruct(s->context->pstream, t);
 524     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_create_stream_callback, s);
 525
 526     pa_stream_set_state(s, PA_STREAM_CREATING);
 527
 528     pa_stream_unref(s);
 529     return 0;
 530 }
 531
 532 int pa_stream_connect_playback(
 533         pa_stream *s,
 534         const char *dev,
 535         const pa_buffer_attr *attr,
 536         pa_stream_flags_t flags,
 537         pa_cvolume *volume,
 538         pa_stream *sync_stream) {
 539
 540     assert(s);
 541     assert(s->ref >= 1);
 542
 543     return create_stream(PA_STREAM_PLAYBACK, s, dev, attr, flags, volume, sync_stream);
 544 }
 545
 546 int pa_stream_connect_record(
 547         pa_stream *s,
 548         const char *dev,
 549         const pa_buffer_attr *attr,
 550         pa_stream_flags_t flags) {
 551
 552     assert(s);
 553     assert(s->ref >= 1);
 554
 555     return create_stream(PA_STREAM_RECORD, s, dev, attr, flags, NULL, NULL);
 556 }
 557
 558 int pa_stream_write(
 559         pa_stream *s,
 560         const void *data,
 561         size_t length,
 562         void (*free_cb)(void *p),
 563         int64_t offset,
 564         pa_seek_mode_t seek) {
 565
 566     pa_memchunk chunk;
 567
 568     assert(s);
 569     assert(s->ref >= 1);
 570     assert(data);
 571
 572     PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
 573     PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_PLAYBACK || s->direction == PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
 574     PA_CHECK_VALIDITY(s->context, seek <= PA_SEEK_RELATIVE_END, PA_ERR_INVALID);
 575     PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_PLAYBACK || (seek == PA_SEEK_RELATIVE && offset == 0), PA_ERR_INVALID);
 576
 577     if (length <= 0)
 578         return 0;
 579
 580     if (free_cb)
 581         chunk.memblock = pa_memblock_new_user((void*) data, length, free_cb, 1, s->context->memblock_stat);
 582     else {
 583         chunk.memblock = pa_memblock_new(length, s->context->memblock_stat);
 584         memcpy(chunk.memblock->data, data, length);
 585     }
 586
 587     chunk.index = 0;
 588     chunk.length = length;
 589
 590     pa_pstream_send_memblock(s->context->pstream, s->channel, offset, seek, &chunk);
 591     pa_memblock_unref(chunk.memblock);
 592
 593     if (length < s->requested_bytes)
 594         s->requested_bytes -= length;
 595     else
 596         s->requested_bytes = 0;
 597
 598     if (s->direction == PA_STREAM_PLAYBACK) {
 599
 600         /* Update latency request correction */
 601         if (s->write_index_corrections[s->current_write_index_correction].valid) {
 602
 603             if (seek == PA_SEEK_ABSOLUTE) {
 604                 s->write_index_corrections[s->current_write_index_correction].corrupt = 0;
 605                 s->write_index_corrections[s->current_write_index_correction].absolute = 1;
 606                 s->write_index_corrections[s->current_write_index_correction].value = offset + length;
 607             } else if (seek == PA_SEEK_RELATIVE) {
 608                 if (!s->write_index_corrections[s->current_write_index_correction].corrupt)
 609                     s->write_index_corrections[s->current_write_index_correction].value += offset + length;
 610             } else
 611                 s->write_index_corrections[s->current_write_index_correction].corrupt = 1;
 612         }
 613
 614         /* Update the write index in the already available latency data */
 615         if (s->timing_info_valid) {
 616
 617             if (seek == PA_SEEK_ABSOLUTE) {
 618                 s->timing_info.write_index_corrupt = 0;
 619                 s->timing_info.write_index = offset + length;
 620             } else if (seek == PA_SEEK_RELATIVE) {
 621                 if (!s->timing_info.write_index_corrupt)
 622                     s->timing_info.write_index += offset + length;
 623             } else
 624                 s->timing_info.write_index_corrupt = 1;
 625         }
 626
 627         if (!s->timing_info_valid || s->timing_info.write_index_corrupt)
 628             request_auto_timing_update(s, 1);
 629     }
 630
 631     return 0;
 632 }
 633
 634 int pa_stream_peek(pa_stream *s, const void **data, size_t *length) {
 635     assert(s);
 636     assert(s->ref >= 1);
 637     assert(data);
 638     assert(length);
 639
 640     PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
 641     PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE);
 642
 643     if (!s->peek_memchunk.memblock) {
 644
 645         if (pa_memblockq_peek(s->record_memblockq, &s->peek_memchunk) < 0) {
 646             *data = NULL;
 647             *length = 0;
 648             return 0;
 649         }
 650     }
 651
 652     *data = (const char*) s->peek_memchunk.memblock->data + s->peek_memchunk.index;
 653     *length = s->peek_memchunk.length;
 654     return 0;
 655 }
 656
 657 int pa_stream_drop(pa_stream *s) {
 658     assert(s);
 659     assert(s->ref >= 1);
 660
 661     PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
 662     PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE);
 663     PA_CHECK_VALIDITY(s->context, s->peek_memchunk.memblock, PA_ERR_BADSTATE);
 664
 665     pa_memblockq_drop(s->record_memblockq, &s->peek_memchunk, s->peek_memchunk.length);
 666
 667     pa_memblock_unref(s->peek_memchunk.memblock);
 668     s->peek_memchunk.length = 0;
 669     s->peek_memchunk.index = 0;
 670     s->peek_memchunk.memblock = NULL;
 671
 672     return 0;
 673 }
 674
 675 size_t pa_stream_writable_size(pa_stream *s) {
 676     assert(s);
 677     assert(s->ref >= 1);
 678
 679     PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, (size_t) -1);
 680     PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->direction != PA_STREAM_RECORD, PA_ERR_BADSTATE, (size_t) -1);
 681
 682     return s->requested_bytes;
 683 }
 684
 685 size_t pa_stream_readable_size(pa_stream *s) {
 686     assert(s);
 687     assert(s->ref >= 1);
 688
 689     PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, (size_t) -1);
 690     PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE, (size_t) -1);
 691
 692     return pa_memblockq_get_length(s->record_memblockq);
 693 }
 694
 695 pa_operation * pa_stream_drain(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
 696     pa_operation *o;
 697     pa_tagstruct *t;
 698     uint32_t tag;
 699
 700     assert(s);
 701     assert(s->ref >= 1);
 702
 703     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
 704     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE);
 705
 706     o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
 707
 708     t = pa_tagstruct_command(s->context, PA_COMMAND_DRAIN_PLAYBACK_STREAM, &tag);
 709     pa_tagstruct_putu32(t, s->channel);
 710     pa_pstream_send_tagstruct(s->context->pstream, t);
 711     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
 712
 713     return pa_operation_ref(o);
 714 }
 715
 716 static void stream_get_timing_info_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
 717     pa_operation *o = userdata;
 718     struct timeval local, remote, now;
 719     pa_timing_info *i;
 720
 721     assert(pd);
 722     assert(o);
 723     assert(o->stream);
 724     assert(o->context);
 725
 726     i = &o->stream->timing_info;
 727
 728     pa_log("pre corrupt w:%u r:%u\n", !o->stream->timing_info_valid || i->write_index_corrupt,!o->stream->timing_info_valid || i->read_index_corrupt);
 729
 730     o->stream->timing_info_valid = 0;
 731     i->write_index_corrupt = 0;
 732     i->read_index_corrupt = 0;
 733
 734     pa_log("timing update %u\n", tag);
 735
 736     if (command != PA_COMMAND_REPLY) {
 737         if (pa_context_handle_error(o->context, command, t) < 0)
 738             goto finish;
 739
 740     } else if (pa_tagstruct_get_usec(t, &i->sink_usec) < 0 ||
 741                pa_tagstruct_get_usec(t, &i->source_usec) < 0 ||
 742                pa_tagstruct_get_boolean(t, &i->playing) < 0 ||
 743                pa_tagstruct_get_timeval(t, &local) < 0 ||
 744                pa_tagstruct_get_timeval(t, &remote) < 0 ||
 745                pa_tagstruct_gets64(t, &i->write_index) < 0 ||
 746                pa_tagstruct_gets64(t, &i->read_index) < 0 ||
 747                !pa_tagstruct_eof(t)) {
 748         pa_context_fail(o->context, PA_ERR_PROTOCOL);
 749         goto finish;
 750
 751     } else {
 752         o->stream->timing_info_valid = 1;
 753
 754         pa_gettimeofday(&now);
 755
 756         /* Calculcate timestamps */
 757         if (pa_timeval_cmp(&local, &remote) <= 0 && pa_timeval_cmp(&remote, &now) <= 0) {
 758             /* local and remote seem to have synchronized clocks */
 759
 760             if (o->stream->direction == PA_STREAM_PLAYBACK)
 761                 i->transport_usec = pa_timeval_diff(&remote, &local);
 762             else
 763                 i->transport_usec = pa_timeval_diff(&now, &remote);
 764
 765             i->synchronized_clocks = 1;
 766             i->timestamp = remote;
 767         } else {
 768             /* clocks are not synchronized, let's estimate latency then */
 769             i->transport_usec = pa_timeval_diff(&now, &local)/2;
 770             i->synchronized_clocks = 0;
 771             i->timestamp = local;
 772             pa_timeval_add(&i->timestamp, i->transport_usec);
 773         }
 774
 775         /* Invalidate read and write indexes if necessary */
 776         if (tag < o->stream->read_index_not_before)
 777             i->read_index_corrupt = 1;
 778
 779         if (tag < o->stream->write_index_not_before)
 780             i->write_index_corrupt = 1;
 781
 782         if (o->stream->direction == PA_STREAM_PLAYBACK) {
 783             /* Write index correction */
 784
 785             int n, j;
 786             uint32_t ctag = tag;
 787
 788             /* Go through the saved correction values and add up the total correction.*/
 789
 790             for (n = 0, j = o->stream->current_write_index_correction+1;
 791                  n < PA_MAX_WRITE_INDEX_CORRECTIONS;
 792                  n++, j = (j + 1) % PA_MAX_WRITE_INDEX_CORRECTIONS) {
 793
 794                 /* Step over invalid data or out-of-date data */
 795                 if (!o->stream->write_index_corrections[j].valid ||
 796                     o->stream->write_index_corrections[j].tag < ctag)
 797                     continue;
 798
 799                 /* Make sure that everything is in order */
 800                 ctag = o->stream->write_index_corrections[j].tag+1;
 801
 802                 /* Now fix the write index */
 803                 if (o->stream->write_index_corrections[j].corrupt) {
 804                     /* A corrupting seek was made */
 805                     i->write_index = 0;
 806                     i->write_index_corrupt = 1;
 807                 } else if (o->stream->write_index_corrections[j].absolute) {
 808                     /* An absolute seek was made */
 809                     i->write_index = o->stream->write_index_corrections[j].value;
 810                     i->write_index_corrupt = 0;
 811                 } else if (!i->write_index_corrupt) {
 812                     /* A relative seek was made */
 813                     i->write_index += o->stream->write_index_corrections[j].value;
 814                 }
 815             }
 816         }
 817
 818         o->stream->ipol_timestamp = now;
 819         o->stream->ipol_usec_valid = 0;
 820     }
 821
 822     o->stream->auto_timing_update_requested = 0;
 823     pa_log("post corrupt w:%u r:%u\n", i->write_index_corrupt || !o->stream->timing_info_valid, i->read_index_corrupt || !o->stream->timing_info_valid);
 824
 825     /* Clear old correction entries */
 826     if (o->stream->direction == PA_STREAM_PLAYBACK) {
 827         int n;
 828
 829         for (n = 0; n < PA_MAX_WRITE_INDEX_CORRECTIONS; n++) {
 830             if (!o->stream->write_index_corrections[n].valid)
 831                 continue;
 832
 833             if (o->stream->write_index_corrections[n].tag <= tag)
 834                 o->stream->write_index_corrections[n].valid = 0;
 835         }
 836     }
 837
 838     if (o->callback) {
 839         pa_stream_success_cb_t cb = (pa_stream_success_cb_t) o->callback;
 840         cb(o->stream, o->stream->timing_info_valid, o->userdata);
 841     }
 842
 843 finish:
 844
 845     pa_operation_done(o);
 846     pa_operation_unref(o);
 847 }
 848
 849 pa_operation* pa_stream_update_timing_info(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
 850     uint32_t tag;
 851     pa_operation *o;
 852     pa_tagstruct *t;
 853     struct timeval now;
 854     int cidx;
 855
 856     assert(s);
 857     assert(s->ref >= 1);
 858
 859     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
 860     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
 861
 862     if (s->direction == PA_STREAM_PLAYBACK) {
 863         /* Find a place to store the write_index correction data for this entry */
 864         cidx = (s->current_write_index_correction + 1) % PA_MAX_WRITE_INDEX_CORRECTIONS;
 865
 866         /* Check if we could allocate a correction slot. If not, there are too many outstanding queries */
 867         PA_CHECK_VALIDITY_RETURN_NULL(s->context, !s->write_index_corrections[cidx].valid, PA_ERR_INTERNAL);
 868     }
 869       o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
 870
 871     t = pa_tagstruct_command(
 872             s->context,
 873             s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_GET_PLAYBACK_LATENCY : PA_COMMAND_GET_RECORD_LATENCY,
 874             &tag);
 875     pa_tagstruct_putu32(t, s->channel);
 876     pa_tagstruct_put_timeval(t, pa_gettimeofday(&now));
 877
 878     pa_pstream_send_tagstruct(s->context->pstream, t);
 879     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_timing_info_callback, o);
 880
 881     if (s->direction == PA_STREAM_PLAYBACK) {
 882         /* Fill in initial correction data */
 883         o->stream->current_write_index_correction = cidx;
 884         o->stream->write_index_corrections[cidx].valid = 1;
 885         o->stream->write_index_corrections[cidx].tag = tag;
 886         o->stream->write_index_corrections[cidx].absolute = 0;
 887         o->stream->write_index_corrections[cidx].value = 0;
 888         o->stream->write_index_corrections[cidx].corrupt = 0;
 889     }
 890
 891     pa_log("requesting update %u\n", tag);
 892
 893     return pa_operation_ref(o);
 894 }
 895
 896 void pa_stream_disconnect_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 897     pa_stream *s = userdata;
 898
 899     assert(pd);
 900     assert(s);
 901     assert(s->ref >= 1);
 902
 903     pa_stream_ref(s);
 904
 905     if (command != PA_COMMAND_REPLY) {
 906         if (pa_context_handle_error(s->context, command, t) < 0)
 907             goto finish;
 908
 909         pa_stream_set_state(s, PA_STREAM_FAILED);
 910         goto finish;
 911     } else if (!pa_tagstruct_eof(t)) {
 912         pa_context_fail(s->context, PA_ERR_PROTOCOL);
 913         goto finish;
 914     }
 915
 916     pa_stream_set_state(s, PA_STREAM_TERMINATED);
 917
 918 finish:
 919     pa_stream_unref(s);
 920 }
 921
 922 int pa_stream_disconnect(pa_stream *s) {
 923     pa_tagstruct *t;
 924     uint32_t tag;
 925
 926     assert(s);
 927     assert(s->ref >= 1);
 928
 929     PA_CHECK_VALIDITY(s->context, s->channel_valid, PA_ERR_BADSTATE);
 930     PA_CHECK_VALIDITY(s->context, s->context->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 931
 932     pa_stream_ref(s);
 933
 934     t = pa_tagstruct_command(
 935             s->context,
 936             s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_DELETE_PLAYBACK_STREAM :
 937             (s->direction == PA_STREAM_RECORD ? PA_COMMAND_DELETE_RECORD_STREAM : PA_COMMAND_DELETE_UPLOAD_STREAM),
 938             &tag);
 939     pa_tagstruct_putu32(t, s->channel);
 940     pa_pstream_send_tagstruct(s->context->pstream, t);
 941     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_disconnect_callback, s);
 942
 943     pa_stream_unref(s);
 944     return 0;
 945 }
 946
 947 void pa_stream_set_read_callback(pa_stream *s, pa_stream_request_cb_t cb, void *userdata) {
 948     assert(s);
 949     assert(s->ref >= 1);
 950
 951     s->read_callback = cb;
 952     s->read_userdata = userdata;
 953 }
 954
 955 void pa_stream_set_write_callback(pa_stream *s, pa_stream_request_cb_t cb, void *userdata) {
 956     assert(s);
 957     assert(s->ref >= 1);
 958
 959     s->write_callback = cb;
 960     s->write_userdata = userdata;
 961 }
 962
 963 void pa_stream_set_state_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
 964     assert(s);
 965     assert(s->ref >= 1);
 966
 967     s->state_callback = cb;
 968     s->state_userdata = userdata;
 969 }
 970
 971 void pa_stream_set_overflow_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
 972     assert(s);
 973     assert(s->ref >= 1);
 974
 975     s->overflow_callback = cb;
 976     s->overflow_userdata = userdata;
 977 }
 978
 979 void pa_stream_set_underflow_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
 980     assert(s);
 981     assert(s->ref >= 1);
 982
 983     s->underflow_callback = cb;
 984     s->underflow_userdata = userdata;
 985 }
 986
 987 void pa_stream_simple_ack_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 988     pa_operation *o = userdata;
 989     int success = 1;
 990
 991     assert(pd);
 992     assert(o);
 993     assert(o->context);
 994     assert(o->ref >= 1);
 995
 996     if (command != PA_COMMAND_REPLY) {
 997         if (pa_context_handle_error(o->context, command, t) < 0)
 998             goto finish;
 999
1000         success = 0;
1001     } else if (!pa_tagstruct_eof(t)) {
1002         pa_context_fail(o->context, PA_ERR_PROTOCOL);
1003         goto finish;
1004     }
1005
1006     if (o->callback) {
1007         pa_stream_success_cb_t cb = (pa_stream_success_cb_t) o->callback;
1008         cb(o->stream, success, o->userdata);
1009     }
1010
1011 finish:
1012     pa_operation_done(o);
1013     pa_operation_unref(o);
1014 }
1015
1016 pa_operation* pa_stream_cork(pa_stream *s, int b, pa_stream_success_cb_t cb, void *userdata) {
1017     pa_operation *o;
1018     pa_tagstruct *t;
1019     uint32_t tag;
1020
1021     assert(s);
1022     assert(s->ref >= 1);
1023
1024     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
1025     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
1026
1027     s->corked = b;
1028
1029     o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
1030
1031     t = pa_tagstruct_command(
1032             s->context,
1033             s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CORK_PLAYBACK_STREAM : PA_COMMAND_CORK_RECORD_STREAM,
1034             &tag);
1035     pa_tagstruct_putu32(t, s->channel);
1036     pa_tagstruct_put_boolean(t, !!b);
1037     pa_pstream_send_tagstruct(s->context->pstream, t);
1038     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
1039
1040     if (s->direction == PA_STREAM_PLAYBACK)
1041         invalidate_indexes(s, 1, 0);
1042
1043     return pa_operation_ref(o);
1044 }
1045
1046 static pa_operation* stream_send_simple_command(pa_stream *s, uint32_t command, pa_stream_success_cb_t cb, void *userdata) {
1047     pa_tagstruct *t;
1048     pa_operation *o;
1049     uint32_t tag;
1050
1051     assert(s);
1052     assert(s->ref >= 1);
1053
1054     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
1055
1056     o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
1057
1058     t = pa_tagstruct_command(s->context, command, &tag);
1059     pa_tagstruct_putu32(t, s->channel);
1060     pa_pstream_send_tagstruct(s->context->pstream, t);
1061     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
1062
1063     return pa_operation_ref(o);
1064 }
1065
1066 pa_operation* pa_stream_flush(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
1067     pa_operation *o;
1068
1069     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
1070
1071     if ((o = stream_send_simple_command(s, s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_FLUSH_PLAYBACK_STREAM : PA_COMMAND_FLUSH_RECORD_STREAM, cb, userdata))) {
1072
1073         if (s->direction == PA_STREAM_PLAYBACK) {
1074             if (s->write_index_corrections[s->current_write_index_correction].valid)
1075                 s->write_index_corrections[s->current_write_index_correction].corrupt = 1;
1076
1077             if (s->timing_info_valid)
1078                 s->timing_info.write_index_corrupt = 1;
1079
1080             if (s->buffer_attr.prebuf > 0)
1081                 invalidate_indexes(s, 1, 0);
1082             else
1083                 request_auto_timing_update(s, 1);
1084         } else
1085             invalidate_indexes(s, 0, 1);
1086     }
1087
1088     return o;
1089 }
1090
1091 pa_operation* pa_stream_prebuf(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
1092     pa_operation *o;
1093
1094     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE);
1095     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->buffer_attr.prebuf > 0, PA_ERR_BADSTATE);
1096
1097     if ((o = stream_send_simple_command(s, PA_COMMAND_PREBUF_PLAYBACK_STREAM, cb, userdata)))
1098         invalidate_indexes(s, 1, 0);
1099
1100     return o;
1101 }
1102
1103 pa_operation* pa_stream_trigger(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
1104     pa_operation *o;
1105
1106     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE);
1107     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->buffer_attr.prebuf > 0, PA_ERR_BADSTATE);
1108
1109     if ((o = stream_send_simple_command(s, PA_COMMAND_TRIGGER_PLAYBACK_STREAM, cb, userdata)))
1110         invalidate_indexes(s, 1, 0);
1111
1112     return o;
1113 }
1114
1115 pa_operation* pa_stream_set_name(pa_stream *s, const char *name, pa_stream_success_cb_t cb, void *userdata) {
1116     pa_operation *o;
1117     pa_tagstruct *t;
1118     uint32_t tag;
1119
1120     assert(s);
1121     assert(s->ref >= 1);
1122     assert(name);
1123
1124     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
1125     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
1126
1127     o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
1128
1129     t = pa_tagstruct_command(
1130             s->context,
1131             s->direction == PA_STREAM_RECORD ? PA_COMMAND_SET_RECORD_STREAM_NAME : PA_COMMAND_SET_PLAYBACK_STREAM_NAME,
1132             &tag);
1133     pa_tagstruct_putu32(t, s->channel);
1134     pa_tagstruct_puts(t, name);
1135     pa_pstream_send_tagstruct(s->context->pstream, t);
1136     pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, o);
1137
1138     return pa_operation_ref(o);
1139 }
1140
1141 int pa_stream_get_time(pa_stream *s, pa_usec_t *r_usec) {
1142     pa_usec_t usec = 0;
1143
1144     assert(s);
1145     assert(s->ref >= 1);
1146
1147     PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
1148     PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
1149     PA_CHECK_VALIDITY(s->context, s->timing_info_valid, PA_ERR_NODATA);
1150     PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_PLAYBACK || !s->timing_info.read_index_corrupt, PA_ERR_NODATA);
1151     PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_RECORD || !s->timing_info.write_index_corrupt, PA_ERR_NODATA);
1152
1153     if (s->flags & PA_STREAM_INTERPOLATE_TIMING && s->ipol_usec_valid)
1154         usec = s->ipol_usec;
1155     else {
1156         if (s->direction == PA_STREAM_PLAYBACK) {
1157             /* The last byte that was written into the output device
1158              * had this time value associated */
1159             usec = pa_bytes_to_usec(s->timing_info.read_index < 0 ? 0 : (uint64_t) s->timing_info.read_index, &s->sample_spec);
1160
1161             if (!s->corked) {
1162                 /* Because the latency info took a little time to come
1163                  * to us, we assume that the real output time is actually
1164                  * a little ahead */
1165                 usec += s->timing_info.transport_usec;
1166
1167                 /* However, the output device usually maintains a buffer
1168                    too, hence the real sample currently played is a little
1169                    back  */
1170                 if (s->timing_info.sink_usec >= usec)
1171                     usec = 0;
1172                 else
1173                     usec -= s->timing_info.sink_usec;
1174             }
1175
1176         } else if (s->direction == PA_STREAM_RECORD) {
1177             /* The last byte written into the server side queue had
1178              * this time value associated */
1179             usec = pa_bytes_to_usec(s->timing_info.write_index < 0 ? 0 : (uint64_t) s->timing_info.write_index, &s->sample_spec);
1180
1181             if (!s->corked) {
1182                 /* Add transport latency */
1183                 usec += s->timing_info.transport_usec;
1184
1185                 /* Add latency of data in device buffer */
1186                 usec += s->timing_info.source_usec;
1187
1188                 /* If this is a monitor source, we need to correct the
1189                  * time by the playback device buffer */
1190                 if (s->timing_info.sink_usec >= usec)
1191                     usec = 0;
1192                 else
1193                     usec -= s->timing_info.sink_usec;
1194             }
1195         }
1196
1197         if (s->flags & PA_STREAM_INTERPOLATE_TIMING) {
1198             s->ipol_usec = usec;
1199             s->ipol_usec_valid = 1;
1200         }
1201     }
1202
1203     /* Interpolate if requested */
1204     if (s->flags & PA_STREAM_INTERPOLATE_TIMING) {
1205
1206         /* We just add the time that passed since the latency info was
1207          * current */
1208         if (!s->corked) {
1209             struct timeval now;
1210
1211             usec += pa_timeval_diff(pa_gettimeofday(&now), &s->ipol_timestamp);
1212             s->ipol_timestamp = now;
1213         }
1214     }
1215
1216     /* Make sure the time runs monotonically */
1217     if (!(s->flags & PA_STREAM_NOT_MONOTONOUS)) {
1218         if (usec < s->previous_time)
1219             usec = s->previous_time;
1220         else
1221             s->previous_time = usec;
1222     }
1223
1224     if (r_usec)
1225         *r_usec = usec;
1226
1227     return 0;
1228 }
1229
1230 static pa_usec_t time_counter_diff(pa_stream *s, pa_usec_t a, pa_usec_t b, int *negative) {
1231     assert(s);
1232     assert(s->ref >= 1);
1233
1234     if (negative)
1235         *negative = 0;
1236
1237     if (a >= b)
1238         return a-b;
1239     else {
1240         if (negative && s->direction == PA_STREAM_RECORD) {
1241             *negative = 1;
1242             return b-a;
1243         } else
1244             return 0;
1245     }
1246 }
1247
1248 int pa_stream_get_latency(pa_stream *s, pa_usec_t *r_usec, int *negative) {
1249     pa_usec_t t, c;
1250     int r;
1251     int64_t cindex;
1252
1253     assert(s);
1254     assert(s->ref >= 1);
1255     assert(r_usec);
1256
1257     PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
1258     PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
1259     PA_CHECK_VALIDITY(s->context, s->timing_info_valid, PA_ERR_NODATA);
1260     PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_PLAYBACK || !s->timing_info.write_index_corrupt, PA_ERR_NODATA);
1261     PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_RECORD || !s->timing_info.read_index_corrupt, PA_ERR_NODATA);
1262
1263     if ((r = pa_stream_get_time(s, &t)) < 0)
1264         return r;
1265
1266     if (s->direction == PA_STREAM_PLAYBACK)
1267         cindex = s->timing_info.write_index;
1268     else
1269         cindex = s->timing_info.read_index;
1270
1271     if (cindex < 0)
1272         cindex = 0;
1273
1274     c = pa_bytes_to_usec(cindex, &s->sample_spec);
1275
1276     if (s->direction == PA_STREAM_PLAYBACK)
1277         *r_usec = time_counter_diff(s, c, t, negative);
1278     else
1279         *r_usec = time_counter_diff(s, t, c, negative);
1280
1281     return 0;
1282 }
1283
1284 const pa_timing_info* pa_stream_get_timing_info(pa_stream *s) {
1285     assert(s);
1286     assert(s->ref >= 1);
1287
1288     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
1289     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
1290     PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->timing_info_valid, PA_ERR_BADSTATE);
1291
1292     return &s->timing_info;
1293 }
1294
1295 const pa_sample_spec* pa_stream_get_sample_spec(pa_stream *s) {
1296     assert(s);
1297     assert(s->ref >= 1);
1298
1299     return &s->sample_spec;
1300 }
1301
1302 const pa_channel_map* pa_stream_get_channel_map(pa_stream *s) {
1303     assert(s);
1304     assert(s->ref >= 1);
1305
1306     return &s->channel_map;
1307 }