audio/paaudio.c

   1 /* public domain */
   2
   3 #include "qemu/osdep.h"
   4 #include "qemu/module.h"
   5 #include "qemu-common.h"
   6 #include "audio.h"
   7 #include "qapi/opts-visitor.h"
   8
   9 #include <pulse/pulseaudio.h>
  10
  11 #define AUDIO_CAP "pulseaudio"
  12 #include "audio_int.h"
  13
  14 typedef struct PAConnection {
  15     char *server;
  16     int refcount;
  17     QTAILQ_ENTRY(PAConnection) list;
  18
  19     pa_threaded_mainloop *mainloop;
  20     pa_context *context;
  21 } PAConnection;
  22
  23 static QTAILQ_HEAD(PAConnectionHead, PAConnection) pa_conns =
  24     QTAILQ_HEAD_INITIALIZER(pa_conns);
  25
  26 typedef struct {
  27     Audiodev *dev;
  28     PAConnection *conn;
  29 } paaudio;
  30
  31 typedef struct {
  32     HWVoiceOut hw;
  33     pa_stream *stream;
  34     paaudio *g;
  35     size_t samples;
  36 } PAVoiceOut;
  37
  38 typedef struct {
  39     HWVoiceIn hw;
  40     pa_stream *stream;
  41     const void *read_data;
  42     size_t read_length;
  43     paaudio *g;
  44     size_t samples;
  45 } PAVoiceIn;
  46
  47 static void qpa_conn_fini(PAConnection *c);
  48
  49 static void GCC_FMT_ATTR (2, 3) qpa_logerr (int err, const char *fmt, ...)
  50 {
  51     va_list ap;
  52
  53     va_start (ap, fmt);
  54     AUD_vlog (AUDIO_CAP, fmt, ap);
  55     va_end (ap);
  56
  57     AUD_log (AUDIO_CAP, "Reason: %s\n", pa_strerror (err));
  58 }
  59
  60 #ifndef PA_CONTEXT_IS_GOOD
  61 static inline int PA_CONTEXT_IS_GOOD(pa_context_state_t x)
  62 {
  63     return
  64         x == PA_CONTEXT_CONNECTING ||
  65         x == PA_CONTEXT_AUTHORIZING ||
  66         x == PA_CONTEXT_SETTING_NAME ||
  67         x == PA_CONTEXT_READY;
  68 }
  69 #endif
  70
  71 #ifndef PA_STREAM_IS_GOOD
  72 static inline int PA_STREAM_IS_GOOD(pa_stream_state_t x)
  73 {
  74     return
  75         x == PA_STREAM_CREATING ||
  76         x == PA_STREAM_READY;
  77 }
  78 #endif
  79
  80 #define CHECK_SUCCESS_GOTO(c, expression, label, msg)           \
  81     do {                                                        \
  82         if (!(expression)) {                                    \
  83             qpa_logerr(pa_context_errno((c)->context), msg);    \
  84             goto label;                                         \
  85         }                                                       \
  86     } while (0)
  87
  88 #define CHECK_DEAD_GOTO(c, stream, label, msg)                          \
  89     do {                                                                \
  90         if (!(c)->context || !PA_CONTEXT_IS_GOOD (pa_context_get_state((c)->context)) || \
  91             !(stream) || !PA_STREAM_IS_GOOD (pa_stream_get_state ((stream)))) { \
  92             if (((c)->context && pa_context_get_state ((c)->context) == PA_CONTEXT_FAILED) || \
  93                 ((stream) && pa_stream_get_state ((stream)) == PA_STREAM_FAILED)) { \
  94                 qpa_logerr(pa_context_errno((c)->context), msg);        \
  95             } else {                                                    \
  96                 qpa_logerr(PA_ERR_BADSTATE, msg);                       \
  97             }                                                           \
  98             goto label;                                                 \
  99         }                                                               \
 100     } while (0)
 101
 102 static void *qpa_get_buffer_in(HWVoiceIn *hw, size_t *size)
 103 {
 104     PAVoiceIn *p = (PAVoiceIn *) hw;
 105     PAConnection *c = p->g->conn;
 106     int r;
 107
 108     pa_threaded_mainloop_lock(c->mainloop);
 109
 110     CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
 111                     "pa_threaded_mainloop_lock failed\n");
 112
 113     if (!p->read_length) {
 114         r = pa_stream_peek(p->stream, &p->read_data, &p->read_length);
 115         CHECK_SUCCESS_GOTO(c, r == 0, unlock_and_fail,
 116                            "pa_stream_peek failed\n");
 117     }
 118
 119     *size = MIN(p->read_length, *size);
 120
 121     pa_threaded_mainloop_unlock(c->mainloop);
 122     return (void *) p->read_data;
 123
 124 unlock_and_fail:
 125     pa_threaded_mainloop_unlock(c->mainloop);
 126     *size = 0;
 127     return NULL;
 128 }
 129
 130 static void qpa_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
 131 {
 132     PAVoiceIn *p = (PAVoiceIn *) hw;
 133     PAConnection *c = p->g->conn;
 134     int r;
 135
 136     pa_threaded_mainloop_lock(c->mainloop);
 137
 138     CHECK_DEAD_GOTO(c, p->stream, unlock,
 139                     "pa_threaded_mainloop_lock failed\n");
 140
 141     assert(buf == p->read_data && size <= p->read_length);
 142
 143     p->read_data += size;
 144     p->read_length -= size;
 145
 146     if (size && !p->read_length) {
 147         r = pa_stream_drop(p->stream);
 148         CHECK_SUCCESS_GOTO(c, r == 0, unlock, "pa_stream_drop failed\n");
 149     }
 150
 151 unlock:
 152     pa_threaded_mainloop_unlock(c->mainloop);
 153 }
 154
 155 static size_t qpa_read(HWVoiceIn *hw, void *data, size_t length)
 156 {
 157     PAVoiceIn *p = (PAVoiceIn *) hw;
 158     PAConnection *c = p->g->conn;
 159     size_t l;
 160     int r;
 161
 162     pa_threaded_mainloop_lock(c->mainloop);
 163
 164     CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
 165                     "pa_threaded_mainloop_lock failed\n");
 166
 167     if (!p->read_length) {
 168         r = pa_stream_peek(p->stream, &p->read_data, &p->read_length);
 169         CHECK_SUCCESS_GOTO(c, r == 0, unlock_and_fail,
 170                            "pa_stream_peek failed\n");
 171     }
 172
 173     l = MIN(p->read_length, length);
 174     memcpy(data, p->read_data, l);
 175
 176     p->read_data += l;
 177     p->read_length -= l;
 178
 179     if (!p->read_length) {
 180         r = pa_stream_drop(p->stream);
 181         CHECK_SUCCESS_GOTO(c, r == 0, unlock_and_fail,
 182                            "pa_stream_drop failed\n");
 183     }
 184
 185     pa_threaded_mainloop_unlock(c->mainloop);
 186     return l;
 187
 188 unlock_and_fail:
 189     pa_threaded_mainloop_unlock(c->mainloop);
 190     return 0;
 191 }
 192
 193 static void *qpa_get_buffer_out(HWVoiceOut *hw, size_t *size)
 194 {
 195     PAVoiceOut *p = (PAVoiceOut *) hw;
 196     PAConnection *c = p->g->conn;
 197     void *ret;
 198     int r;
 199
 200     pa_threaded_mainloop_lock(c->mainloop);
 201
 202     CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
 203                     "pa_threaded_mainloop_lock failed\n");
 204
 205     *size = -1;
 206     r = pa_stream_begin_write(p->stream, &ret, size);
 207     CHECK_SUCCESS_GOTO(c, r >= 0, unlock_and_fail,
 208                        "pa_stream_begin_write failed\n");
 209
 210     pa_threaded_mainloop_unlock(c->mainloop);
 211     return ret;
 212
 213 unlock_and_fail:
 214     pa_threaded_mainloop_unlock(c->mainloop);
 215     *size = 0;
 216     return NULL;
 217 }
 218
 219 static size_t qpa_write(HWVoiceOut *hw, void *data, size_t length)
 220 {
 221     PAVoiceOut *p = (PAVoiceOut *) hw;
 222     PAConnection *c = p->g->conn;
 223     size_t l;
 224     int r;
 225
 226     pa_threaded_mainloop_lock(c->mainloop);
 227
 228     CHECK_DEAD_GOTO(c, p->stream, unlock_and_fail,
 229                     "pa_threaded_mainloop_lock failed\n");
 230
 231     l = pa_stream_writable_size(p->stream);
 232
 233     CHECK_SUCCESS_GOTO(c, l != (size_t) -1, unlock_and_fail,
 234                        "pa_stream_writable_size failed\n");
 235
 236     if (l > length) {
 237         l = length;
 238     }
 239
 240     r = pa_stream_write(p->stream, data, l, NULL, 0LL, PA_SEEK_RELATIVE);
 241     CHECK_SUCCESS_GOTO(c, r >= 0, unlock_and_fail, "pa_stream_write failed\n");
 242
 243     pa_threaded_mainloop_unlock(c->mainloop);
 244     return l;
 245
 246 unlock_and_fail:
 247     pa_threaded_mainloop_unlock(c->mainloop);
 248     return 0;
 249 }
 250
 251 static pa_sample_format_t audfmt_to_pa (AudioFormat afmt, int endianness)
 252 {
 253     int format;
 254
 255     switch (afmt) {
 256     case AUDIO_FORMAT_S8:
 257     case AUDIO_FORMAT_U8:
 258         format = PA_SAMPLE_U8;
 259         break;
 260     case AUDIO_FORMAT_S16:
 261     case AUDIO_FORMAT_U16:
 262         format = endianness ? PA_SAMPLE_S16BE : PA_SAMPLE_S16LE;
 263         break;
 264     case AUDIO_FORMAT_S32:
 265     case AUDIO_FORMAT_U32:
 266         format = endianness ? PA_SAMPLE_S32BE : PA_SAMPLE_S32LE;
 267         break;
 268     default:
 269         dolog ("Internal logic error: Bad audio format %d\n", afmt);
 270         format = PA_SAMPLE_U8;
 271         break;
 272     }
 273     return format;
 274 }
 275
 276 static AudioFormat pa_to_audfmt (pa_sample_format_t fmt, int *endianness)
 277 {
 278     switch (fmt) {
 279     case PA_SAMPLE_U8:
 280         return AUDIO_FORMAT_U8;
 281     case PA_SAMPLE_S16BE:
 282         *endianness = 1;
 283         return AUDIO_FORMAT_S16;
 284     case PA_SAMPLE_S16LE:
 285         *endianness = 0;
 286         return AUDIO_FORMAT_S16;
 287     case PA_SAMPLE_S32BE:
 288         *endianness = 1;
 289         return AUDIO_FORMAT_S32;
 290     case PA_SAMPLE_S32LE:
 291         *endianness = 0;
 292         return AUDIO_FORMAT_S32;
 293     default:
 294         dolog ("Internal logic error: Bad pa_sample_format %d\n", fmt);
 295         return AUDIO_FORMAT_U8;
 296     }
 297 }
 298
 299 static void context_state_cb (pa_context *c, void *userdata)
 300 {
 301     PAConnection *conn = userdata;
 302
 303     switch (pa_context_get_state(c)) {
 304     case PA_CONTEXT_READY:
 305     case PA_CONTEXT_TERMINATED:
 306     case PA_CONTEXT_FAILED:
 307         pa_threaded_mainloop_signal(conn->mainloop, 0);
 308         break;
 309
 310     case PA_CONTEXT_UNCONNECTED:
 311     case PA_CONTEXT_CONNECTING:
 312     case PA_CONTEXT_AUTHORIZING:
 313     case PA_CONTEXT_SETTING_NAME:
 314         break;
 315     }
 316 }
 317
 318 static void stream_state_cb (pa_stream *s, void * userdata)
 319 {
 320     PAConnection *c = userdata;
 321
 322     switch (pa_stream_get_state (s)) {
 323
 324     case PA_STREAM_READY:
 325     case PA_STREAM_FAILED:
 326     case PA_STREAM_TERMINATED:
 327         pa_threaded_mainloop_signal(c->mainloop, 0);
 328         break;
 329
 330     case PA_STREAM_UNCONNECTED:
 331     case PA_STREAM_CREATING:
 332         break;
 333     }
 334 }
 335
 336 static pa_stream *qpa_simple_new (
 337         PAConnection *c,
 338         const char *name,
 339         pa_stream_direction_t dir,
 340         const char *dev,
 341         const pa_sample_spec *ss,
 342         const pa_buffer_attr *attr,
 343         int *rerror)
 344 {
 345     int r;
 346     pa_stream *stream = NULL;
 347     pa_stream_flags_t flags;
 348     pa_channel_map map;
 349
 350     pa_threaded_mainloop_lock(c->mainloop);
 351
 352     pa_channel_map_init(&map);
 353     map.channels = ss->channels;
 354
 355     /*
 356      * TODO: This currently expects the only frontend supporting more than 2
 357      * channels is the usb-audio.  We will need some means to set channel
 358      * order when a new frontend gains multi-channel support.
 359      */
 360     switch (ss->channels) {
 361     case 1:
 362         map.map[0] = PA_CHANNEL_POSITION_MONO;
 363         break;
 364
 365     case 2:
 366         map.map[0] = PA_CHANNEL_POSITION_LEFT;
 367         map.map[1] = PA_CHANNEL_POSITION_RIGHT;
 368         break;
 369
 370     case 6:
 371         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 372         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 373         map.map[2] = PA_CHANNEL_POSITION_CENTER;
 374         map.map[3] = PA_CHANNEL_POSITION_LFE;
 375         map.map[4] = PA_CHANNEL_POSITION_REAR_LEFT;
 376         map.map[5] = PA_CHANNEL_POSITION_REAR_RIGHT;
 377         break;
 378
 379     case 8:
 380         map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
 381         map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
 382         map.map[2] = PA_CHANNEL_POSITION_CENTER;
 383         map.map[3] = PA_CHANNEL_POSITION_LFE;
 384         map.map[4] = PA_CHANNEL_POSITION_REAR_LEFT;
 385         map.map[5] = PA_CHANNEL_POSITION_REAR_RIGHT;
 386         map.map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
 387         map.map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
 388
 389     default:
 390         dolog("Internal error: unsupported channel count %d\n", ss->channels);
 391         goto fail;
 392     }
 393
 394     stream = pa_stream_new(c->context, name, ss, &map);
 395     if (!stream) {
 396         goto fail;
 397     }
 398
 399     pa_stream_set_state_callback(stream, stream_state_cb, c);
 400
 401     flags =
 402         PA_STREAM_INTERPOLATE_TIMING
 403         | PA_STREAM_AUTO_TIMING_UPDATE
 404         | PA_STREAM_EARLY_REQUESTS;
 405
 406     if (dev) {
 407         /* don't move the stream if the user specified a sink/source */
 408         flags |= PA_STREAM_DONT_MOVE;
 409     }
 410
 411     if (dir == PA_STREAM_PLAYBACK) {
 412         r = pa_stream_connect_playback(stream, dev, attr, flags, NULL, NULL);
 413     } else {
 414         r = pa_stream_connect_record(stream, dev, attr, flags);
 415     }
 416
 417     if (r < 0) {
 418       goto fail;
 419     }
 420
 421     pa_threaded_mainloop_unlock(c->mainloop);
 422
 423     return stream;
 424
 425 fail:
 426     pa_threaded_mainloop_unlock(c->mainloop);
 427
 428     if (stream) {
 429         pa_stream_unref (stream);
 430     }
 431
 432     *rerror = pa_context_errno(c->context);
 433
 434     return NULL;
 435 }
 436
 437 static int qpa_init_out(HWVoiceOut *hw, struct audsettings *as,
 438                         void *drv_opaque)
 439 {
 440     int error;
 441     pa_sample_spec ss;
 442     pa_buffer_attr ba;
 443     struct audsettings obt_as = *as;
 444     PAVoiceOut *pa = (PAVoiceOut *) hw;
 445     paaudio *g = pa->g = drv_opaque;
 446     AudiodevPaOptions *popts = &g->dev->u.pa;
 447     AudiodevPaPerDirectionOptions *ppdo = popts->out;
 448     PAConnection *c = g->conn;
 449
 450     ss.format = audfmt_to_pa (as->fmt, as->endianness);
 451     ss.channels = as->nchannels;
 452     ss.rate = as->freq;
 453
 454     ba.tlength = pa_usec_to_bytes(ppdo->latency, &ss);
 455     ba.minreq = -1;
 456     ba.maxlength = -1;
 457     ba.prebuf = -1;
 458
 459     obt_as.fmt = pa_to_audfmt (ss.format, &obt_as.endianness);
 460
 461     pa->stream = qpa_simple_new (
 462         c,
 463         ppdo->has_stream_name ? ppdo->stream_name : g->dev->id,
 464         PA_STREAM_PLAYBACK,
 465         ppdo->has_name ? ppdo->name : NULL,
 466         &ss,
 467         &ba,                    /* buffering attributes */
 468         &error
 469         );
 470     if (!pa->stream) {
 471         qpa_logerr (error, "pa_simple_new for playback failed\n");
 472         goto fail1;
 473     }
 474
 475     audio_pcm_init_info (&hw->info, &obt_as);
 476     hw->samples = pa->samples = audio_buffer_samples(
 477         qapi_AudiodevPaPerDirectionOptions_base(ppdo),
 478         &obt_as, ppdo->buffer_length);
 479
 480     return 0;
 481
 482  fail1:
 483     return -1;
 484 }
 485
 486 static int qpa_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
 487 {
 488     int error;
 489     pa_sample_spec ss;
 490     pa_buffer_attr ba;
 491     struct audsettings obt_as = *as;
 492     PAVoiceIn *pa = (PAVoiceIn *) hw;
 493     paaudio *g = pa->g = drv_opaque;
 494     AudiodevPaOptions *popts = &g->dev->u.pa;
 495     AudiodevPaPerDirectionOptions *ppdo = popts->in;
 496     PAConnection *c = g->conn;
 497
 498     ss.format = audfmt_to_pa (as->fmt, as->endianness);
 499     ss.channels = as->nchannels;
 500     ss.rate = as->freq;
 501
 502     ba.fragsize = pa_usec_to_bytes(ppdo->latency, &ss);
 503     ba.maxlength = pa_usec_to_bytes(ppdo->latency * 2, &ss);
 504     ba.minreq = -1;
 505     ba.prebuf = -1;
 506
 507     obt_as.fmt = pa_to_audfmt (ss.format, &obt_as.endianness);
 508
 509     pa->stream = qpa_simple_new (
 510         c,
 511         ppdo->has_stream_name ? ppdo->stream_name : g->dev->id,
 512         PA_STREAM_RECORD,
 513         ppdo->has_name ? ppdo->name : NULL,
 514         &ss,
 515         &ba,                    /* buffering attributes */
 516         &error
 517         );
 518     if (!pa->stream) {
 519         qpa_logerr (error, "pa_simple_new for capture failed\n");
 520         goto fail1;
 521     }
 522
 523     audio_pcm_init_info (&hw->info, &obt_as);
 524     hw->samples = pa->samples = audio_buffer_samples(
 525         qapi_AudiodevPaPerDirectionOptions_base(ppdo),
 526         &obt_as, ppdo->buffer_length);
 527
 528     return 0;
 529
 530  fail1:
 531     return -1;
 532 }
 533
 534 static void qpa_simple_disconnect(PAConnection *c, pa_stream *stream)
 535 {
 536     int err;
 537
 538     pa_threaded_mainloop_lock(c->mainloop);
 539     /*
 540      * wait until actually connects. workaround pa bug #247
 541      * https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/247
 542      */
 543     while (pa_stream_get_state(stream) == PA_STREAM_CREATING) {
 544         pa_threaded_mainloop_wait(c->mainloop);
 545     }
 546
 547     err = pa_stream_disconnect(stream);
 548     if (err != 0) {
 549         dolog("Failed to disconnect! err=%d\n", err);
 550     }
 551     pa_stream_unref(stream);
 552     pa_threaded_mainloop_unlock(c->mainloop);
 553 }
 554
 555 static void qpa_fini_out (HWVoiceOut *hw)
 556 {
 557     PAVoiceOut *pa = (PAVoiceOut *) hw;
 558
 559     if (pa->stream) {
 560         qpa_simple_disconnect(pa->g->conn, pa->stream);
 561         pa->stream = NULL;
 562     }
 563 }
 564
 565 static void qpa_fini_in (HWVoiceIn *hw)
 566 {
 567     PAVoiceIn *pa = (PAVoiceIn *) hw;
 568
 569     if (pa->stream) {
 570         qpa_simple_disconnect(pa->g->conn, pa->stream);
 571         pa->stream = NULL;
 572     }
 573 }
 574
 575 static void qpa_volume_out(HWVoiceOut *hw, Volume *vol)
 576 {
 577     PAVoiceOut *pa = (PAVoiceOut *) hw;
 578     pa_operation *op;
 579     pa_cvolume v;
 580     PAConnection *c = pa->g->conn;
 581     int i;
 582
 583 #ifdef PA_CHECK_VERSION    /* macro is present in 0.9.16+ */
 584     pa_cvolume_init (&v);  /* function is present in 0.9.13+ */
 585 #endif
 586
 587     v.channels = vol->channels;
 588     for (i = 0; i < vol->channels; ++i) {
 589         v.values[i] = ((PA_VOLUME_NORM - PA_VOLUME_MUTED) * vol->vol[i]) / 255;
 590     }
 591
 592     pa_threaded_mainloop_lock(c->mainloop);
 593
 594     op = pa_context_set_sink_input_volume(c->context,
 595                                           pa_stream_get_index(pa->stream),
 596                                           &v, NULL, NULL);
 597     if (!op) {
 598         qpa_logerr(pa_context_errno(c->context),
 599                    "set_sink_input_volume() failed\n");
 600     } else {
 601         pa_operation_unref(op);
 602     }
 603
 604     op = pa_context_set_sink_input_mute(c->context,
 605                                         pa_stream_get_index(pa->stream),
 606                                         vol->mute, NULL, NULL);
 607     if (!op) {
 608         qpa_logerr(pa_context_errno(c->context),
 609                    "set_sink_input_mute() failed\n");
 610     } else {
 611         pa_operation_unref(op);
 612     }
 613
 614     pa_threaded_mainloop_unlock(c->mainloop);
 615 }
 616
 617 static void qpa_volume_in(HWVoiceIn *hw, Volume *vol)
 618 {
 619     PAVoiceIn *pa = (PAVoiceIn *) hw;
 620     pa_operation *op;
 621     pa_cvolume v;
 622     PAConnection *c = pa->g->conn;
 623     int i;
 624
 625 #ifdef PA_CHECK_VERSION
 626     pa_cvolume_init (&v);
 627 #endif
 628
 629     v.channels = vol->channels;
 630     for (i = 0; i < vol->channels; ++i) {
 631         v.values[i] = ((PA_VOLUME_NORM - PA_VOLUME_MUTED) * vol->vol[i]) / 255;
 632     }
 633
 634     pa_threaded_mainloop_lock(c->mainloop);
 635
 636     op = pa_context_set_source_output_volume(c->context,
 637         pa_stream_get_index(pa->stream),
 638         &v, NULL, NULL);
 639     if (!op) {
 640         qpa_logerr(pa_context_errno(c->context),
 641                    "set_source_output_volume() failed\n");
 642     } else {
 643         pa_operation_unref(op);
 644     }
 645
 646     op = pa_context_set_source_output_mute(c->context,
 647         pa_stream_get_index(pa->stream),
 648         vol->mute, NULL, NULL);
 649     if (!op) {
 650         qpa_logerr(pa_context_errno(c->context),
 651                    "set_source_output_mute() failed\n");
 652     } else {
 653         pa_operation_unref(op);
 654     }
 655
 656     pa_threaded_mainloop_unlock(c->mainloop);
 657 }
 658
 659 static int qpa_validate_per_direction_opts(Audiodev *dev,
 660                                            AudiodevPaPerDirectionOptions *pdo)
 661 {
 662     if (!pdo->has_buffer_length) {
 663         pdo->has_buffer_length = true;
 664         pdo->buffer_length = 46440;
 665     }
 666     if (!pdo->has_latency) {
 667         pdo->has_latency = true;
 668         pdo->latency = 15000;
 669     }
 670     return 1;
 671 }
 672
 673 /* common */
 674 static void *qpa_conn_init(const char *server)
 675 {
 676     const char *vm_name;
 677     PAConnection *c = g_malloc0(sizeof(PAConnection));
 678     QTAILQ_INSERT_TAIL(&pa_conns, c, list);
 679
 680     c->mainloop = pa_threaded_mainloop_new();
 681     if (!c->mainloop) {
 682         goto fail;
 683     }
 684
 685     vm_name = qemu_get_vm_name();
 686     c->context = pa_context_new(pa_threaded_mainloop_get_api(c->mainloop),
 687                                 vm_name ? vm_name : "qemu");
 688     if (!c->context) {
 689         goto fail;
 690     }
 691
 692     pa_context_set_state_callback(c->context, context_state_cb, c);
 693
 694     if (pa_context_connect(c->context, server, 0, NULL) < 0) {
 695         qpa_logerr(pa_context_errno(c->context),
 696                    "pa_context_connect() failed\n");
 697         goto fail;
 698     }
 699
 700     pa_threaded_mainloop_lock(c->mainloop);
 701
 702     if (pa_threaded_mainloop_start(c->mainloop) < 0) {
 703         goto unlock_and_fail;
 704     }
 705
 706     for (;;) {
 707         pa_context_state_t state;
 708
 709         state = pa_context_get_state(c->context);
 710
 711         if (state == PA_CONTEXT_READY) {
 712             break;
 713         }
 714
 715         if (!PA_CONTEXT_IS_GOOD(state)) {
 716             qpa_logerr(pa_context_errno(c->context),
 717                        "Wrong context state\n");
 718             goto unlock_and_fail;
 719         }
 720
 721         /* Wait until the context is ready */
 722         pa_threaded_mainloop_wait(c->mainloop);
 723     }
 724
 725     pa_threaded_mainloop_unlock(c->mainloop);
 726     return c;
 727
 728 unlock_and_fail:
 729     pa_threaded_mainloop_unlock(c->mainloop);
 730 fail:
 731     AUD_log (AUDIO_CAP, "Failed to initialize PA context");
 732     qpa_conn_fini(c);
 733     return NULL;
 734 }
 735
 736 static void *qpa_audio_init(Audiodev *dev)
 737 {
 738     paaudio *g;
 739     AudiodevPaOptions *popts = &dev->u.pa;
 740     const char *server;
 741     PAConnection *c;
 742
 743     assert(dev->driver == AUDIODEV_DRIVER_PA);
 744
 745     if (!popts->has_server) {
 746         char pidfile[64];
 747         char *runtime;
 748         struct stat st;
 749
 750         runtime = getenv("XDG_RUNTIME_DIR");
 751         if (!runtime) {
 752             return NULL;
 753         }
 754         snprintf(pidfile, sizeof(pidfile), "%s/pulse/pid", runtime);
 755         if (stat(pidfile, &st) != 0) {
 756             return NULL;
 757         }
 758     }
 759
 760     if (!qpa_validate_per_direction_opts(dev, popts->in)) {
 761         return NULL;
 762     }
 763     if (!qpa_validate_per_direction_opts(dev, popts->out)) {
 764         return NULL;
 765     }
 766
 767     g = g_malloc0(sizeof(paaudio));
 768     server = popts->has_server ? popts->server : NULL;
 769
 770     g->dev = dev;
 771
 772     QTAILQ_FOREACH(c, &pa_conns, list) {
 773         if (server == NULL || c->server == NULL ?
 774             server == c->server :
 775             strcmp(server, c->server) == 0) {
 776             g->conn = c;
 777             break;
 778         }
 779     }
 780     if (!g->conn) {
 781         g->conn = qpa_conn_init(server);
 782     }
 783     if (!g->conn) {
 784         g_free(g);
 785         return NULL;
 786     }
 787
 788     ++g->conn->refcount;
 789     return g;
 790 }
 791
 792 static void qpa_conn_fini(PAConnection *c)
 793 {
 794     if (c->mainloop) {
 795         pa_threaded_mainloop_stop(c->mainloop);
 796     }
 797
 798     if (c->context) {
 799         pa_context_disconnect(c->context);
 800         pa_context_unref(c->context);
 801     }
 802
 803     if (c->mainloop) {
 804         pa_threaded_mainloop_free(c->mainloop);
 805     }
 806
 807     QTAILQ_REMOVE(&pa_conns, c, list);
 808     g_free(c);
 809 }
 810
 811 static void qpa_audio_fini (void *opaque)
 812 {
 813     paaudio *g = opaque;
 814     PAConnection *c = g->conn;
 815
 816     if (--c->refcount == 0) {
 817         qpa_conn_fini(c);
 818     }
 819
 820     g_free(g);
 821 }
 822
 823 static struct audio_pcm_ops qpa_pcm_ops = {
 824     .init_out = qpa_init_out,
 825     .fini_out = qpa_fini_out,
 826     .write    = qpa_write,
 827     .get_buffer_out = qpa_get_buffer_out,
 828     .put_buffer_out = qpa_write, /* pa handles it */
 829     .volume_out = qpa_volume_out,
 830
 831     .init_in  = qpa_init_in,
 832     .fini_in  = qpa_fini_in,
 833     .read     = qpa_read,
 834     .get_buffer_in = qpa_get_buffer_in,
 835     .put_buffer_in = qpa_put_buffer_in,
 836     .volume_in = qpa_volume_in
 837 };
 838
 839 static struct audio_driver pa_audio_driver = {
 840     .name           = "pa",
 841     .descr          = "http://www.pulseaudio.org/",
 842     .init           = qpa_audio_init,
 843     .fini           = qpa_audio_fini,
 844     .pcm_ops        = &qpa_pcm_ops,
 845     .can_be_default = 1,
 846     .max_voices_out = INT_MAX,
 847     .max_voices_in  = INT_MAX,
 848     .voice_size_out = sizeof (PAVoiceOut),
 849     .voice_size_in  = sizeof (PAVoiceIn),
 850 };
 851
 852 static void register_audio_pa(void)
 853 {
 854     audio_driver_register(&pa_audio_driver);
 855 }
 856 type_init(register_audio_pa);