audio/audio.c

   1 /*
   2  * QEMU Audio subsystem
   3  *
   4  * Copyright (c) 2003-2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "audio.h"
  27 #include "migration/vmstate.h"
  28 #include "monitor/monitor.h"
  29 #include "qemu/timer.h"
  30 #include "qapi/error.h"
  31 #include "qapi/qobject-input-visitor.h"
  32 #include "qapi/qapi-visit-audio.h"
  33 #include "qemu/cutils.h"
  34 #include "qemu/module.h"
  35 #include "sysemu/replay.h"
  36 #include "sysemu/runstate.h"
  37 #include "trace.h"
  38
  39 #define AUDIO_CAP "audio"
  40 #include "audio_int.h"
  41
  42 /* #define DEBUG_LIVE */
  43 /* #define DEBUG_OUT */
  44 /* #define DEBUG_CAPTURE */
  45 /* #define DEBUG_POLL */
  46
  47 #define SW_NAME(sw) (sw)->name ? (sw)->name : "unknown"
  48
  49
  50 /* Order of CONFIG_AUDIO_DRIVERS is import.
  51    The 1st one is the one used by default, that is the reason
  52     that we generate the list.
  53 */
  54 const char *audio_prio_list[] = {
  55     "spice",
  56     CONFIG_AUDIO_DRIVERS
  57     "none",
  58     "wav",
  59     NULL
  60 };
  61
  62 static QLIST_HEAD(, audio_driver) audio_drivers;
  63 static AudiodevListHead audiodevs = QSIMPLEQ_HEAD_INITIALIZER(audiodevs);
  64
  65 void audio_driver_register(audio_driver *drv)
  66 {
  67     QLIST_INSERT_HEAD(&audio_drivers, drv, next);
  68 }
  69
  70 audio_driver *audio_driver_lookup(const char *name)
  71 {
  72     struct audio_driver *d;
  73
  74     QLIST_FOREACH(d, &audio_drivers, next) {
  75         if (strcmp(name, d->name) == 0) {
  76             return d;
  77         }
  78     }
  79
  80     audio_module_load_one(name);
  81     QLIST_FOREACH(d, &audio_drivers, next) {
  82         if (strcmp(name, d->name) == 0) {
  83             return d;
  84         }
  85     }
  86
  87     return NULL;
  88 }
  89
  90 static QTAILQ_HEAD(AudioStateHead, AudioState) audio_states =
  91     QTAILQ_HEAD_INITIALIZER(audio_states);
  92
  93 const struct mixeng_volume nominal_volume = {
  94     .mute = 0,
  95 #ifdef FLOAT_MIXENG
  96     .r = 1.0,
  97     .l = 1.0,
  98 #else
  99     .r = 1ULL << 32,
 100     .l = 1ULL << 32,
 101 #endif
 102 };
 103
 104 static bool legacy_config = true;
 105
 106 #ifdef AUDIO_IS_FLAWLESS_AND_NO_CHECKS_ARE_REQURIED
 107 #error No its not
 108 #else
 109 int audio_bug (const char *funcname, int cond)
 110 {
 111     if (cond) {
 112         static int shown;
 113
 114         AUD_log (NULL, "A bug was just triggered in %s\n", funcname);
 115         if (!shown) {
 116             shown = 1;
 117             AUD_log (NULL, "Save all your work and restart without audio\n");
 118             AUD_log (NULL, "I am sorry\n");
 119         }
 120         AUD_log (NULL, "Context:\n");
 121
 122 #if defined AUDIO_BREAKPOINT_ON_BUG
 123 #  if defined HOST_I386
 124 #    if defined __GNUC__
 125         __asm__ ("int3");
 126 #    elif defined _MSC_VER
 127         _asm _emit 0xcc;
 128 #    else
 129         abort ();
 130 #    endif
 131 #  else
 132         abort ();
 133 #  endif
 134 #endif
 135     }
 136
 137     return cond;
 138 }
 139 #endif
 140
 141 static inline int audio_bits_to_index (int bits)
 142 {
 143     switch (bits) {
 144     case 8:
 145         return 0;
 146
 147     case 16:
 148         return 1;
 149
 150     case 32:
 151         return 2;
 152
 153     default:
 154         audio_bug ("bits_to_index", 1);
 155         AUD_log (NULL, "invalid bits %d\n", bits);
 156         return 0;
 157     }
 158 }
 159
 160 void *audio_calloc (const char *funcname, int nmemb, size_t size)
 161 {
 162     int cond;
 163     size_t len;
 164
 165     len = nmemb * size;
 166     cond = !nmemb || !size;
 167     cond |= nmemb < 0;
 168     cond |= len < size;
 169
 170     if (audio_bug ("audio_calloc", cond)) {
 171         AUD_log (NULL, "%s passed invalid arguments to audio_calloc\n",
 172                  funcname);
 173         AUD_log (NULL, "nmemb=%d size=%zu (len=%zu)\n", nmemb, size, len);
 174         return NULL;
 175     }
 176
 177     return g_malloc0 (len);
 178 }
 179
 180 void AUD_vlog (const char *cap, const char *fmt, va_list ap)
 181 {
 182     if (cap) {
 183         fprintf(stderr, "%s: ", cap);
 184     }
 185
 186     vfprintf(stderr, fmt, ap);
 187 }
 188
 189 void AUD_log (const char *cap, const char *fmt, ...)
 190 {
 191     va_list ap;
 192
 193     va_start (ap, fmt);
 194     AUD_vlog (cap, fmt, ap);
 195     va_end (ap);
 196 }
 197
 198 static void audio_print_settings (struct audsettings *as)
 199 {
 200     dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels);
 201
 202     switch (as->fmt) {
 203     case AUDIO_FORMAT_S8:
 204         AUD_log (NULL, "S8");
 205         break;
 206     case AUDIO_FORMAT_U8:
 207         AUD_log (NULL, "U8");
 208         break;
 209     case AUDIO_FORMAT_S16:
 210         AUD_log (NULL, "S16");
 211         break;
 212     case AUDIO_FORMAT_U16:
 213         AUD_log (NULL, "U16");
 214         break;
 215     case AUDIO_FORMAT_S32:
 216         AUD_log (NULL, "S32");
 217         break;
 218     case AUDIO_FORMAT_U32:
 219         AUD_log (NULL, "U32");
 220         break;
 221     default:
 222         AUD_log (NULL, "invalid(%d)", as->fmt);
 223         break;
 224     }
 225
 226     AUD_log (NULL, " endianness=");
 227     switch (as->endianness) {
 228     case 0:
 229         AUD_log (NULL, "little");
 230         break;
 231     case 1:
 232         AUD_log (NULL, "big");
 233         break;
 234     default:
 235         AUD_log (NULL, "invalid");
 236         break;
 237     }
 238     AUD_log (NULL, "\n");
 239 }
 240
 241 static int audio_validate_settings (struct audsettings *as)
 242 {
 243     int invalid;
 244
 245     invalid = as->nchannels < 1;
 246     invalid |= as->endianness != 0 && as->endianness != 1;
 247
 248     switch (as->fmt) {
 249     case AUDIO_FORMAT_S8:
 250     case AUDIO_FORMAT_U8:
 251     case AUDIO_FORMAT_S16:
 252     case AUDIO_FORMAT_U16:
 253     case AUDIO_FORMAT_S32:
 254     case AUDIO_FORMAT_U32:
 255         break;
 256     default:
 257         invalid = 1;
 258         break;
 259     }
 260
 261     invalid |= as->freq <= 0;
 262     return invalid ? -1 : 0;
 263 }
 264
 265 static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as)
 266 {
 267     int bits = 8, sign = 0;
 268
 269     switch (as->fmt) {
 270     case AUDIO_FORMAT_S8:
 271         sign = 1;
 272         /* fall through */
 273     case AUDIO_FORMAT_U8:
 274         break;
 275
 276     case AUDIO_FORMAT_S16:
 277         sign = 1;
 278         /* fall through */
 279     case AUDIO_FORMAT_U16:
 280         bits = 16;
 281         break;
 282
 283     case AUDIO_FORMAT_S32:
 284         sign = 1;
 285         /* fall through */
 286     case AUDIO_FORMAT_U32:
 287         bits = 32;
 288         break;
 289
 290     default:
 291         abort();
 292     }
 293     return info->freq == as->freq
 294         && info->nchannels == as->nchannels
 295         && info->sign == sign
 296         && info->bits == bits
 297         && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS);
 298 }
 299
 300 void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as)
 301 {
 302     int bits = 8, sign = 0, mul;
 303
 304     switch (as->fmt) {
 305     case AUDIO_FORMAT_S8:
 306         sign = 1;
 307         /* fall through */
 308     case AUDIO_FORMAT_U8:
 309         mul = 1;
 310         break;
 311
 312     case AUDIO_FORMAT_S16:
 313         sign = 1;
 314         /* fall through */
 315     case AUDIO_FORMAT_U16:
 316         bits = 16;
 317         mul = 2;
 318         break;
 319
 320     case AUDIO_FORMAT_S32:
 321         sign = 1;
 322         /* fall through */
 323     case AUDIO_FORMAT_U32:
 324         bits = 32;
 325         mul = 4;
 326         break;
 327
 328     default:
 329         abort();
 330     }
 331
 332     info->freq = as->freq;
 333     info->bits = bits;
 334     info->sign = sign;
 335     info->nchannels = as->nchannels;
 336     info->bytes_per_frame = as->nchannels * mul;
 337     info->bytes_per_second = info->freq * info->bytes_per_frame;
 338     info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS);
 339 }
 340
 341 void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len)
 342 {
 343     if (!len) {
 344         return;
 345     }
 346
 347     if (info->sign) {
 348         memset(buf, 0x00, len * info->bytes_per_frame);
 349     }
 350     else {
 351         switch (info->bits) {
 352         case 8:
 353             memset(buf, 0x80, len * info->bytes_per_frame);
 354             break;
 355
 356         case 16:
 357             {
 358                 int i;
 359                 uint16_t *p = buf;
 360                 short s = INT16_MAX;
 361
 362                 if (info->swap_endianness) {
 363                     s = bswap16 (s);
 364                 }
 365
 366                 for (i = 0; i < len * info->nchannels; i++) {
 367                     p[i] = s;
 368                 }
 369             }
 370             break;
 371
 372         case 32:
 373             {
 374                 int i;
 375                 uint32_t *p = buf;
 376                 int32_t s = INT32_MAX;
 377
 378                 if (info->swap_endianness) {
 379                     s = bswap32 (s);
 380                 }
 381
 382                 for (i = 0; i < len * info->nchannels; i++) {
 383                     p[i] = s;
 384                 }
 385             }
 386             break;
 387
 388         default:
 389             AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n",
 390                      info->bits);
 391             break;
 392         }
 393     }
 394 }
 395
 396 /*
 397  * Capture
 398  */
 399 static void noop_conv (struct st_sample *dst, const void *src, int samples)
 400 {
 401     (void) src;
 402     (void) dst;
 403     (void) samples;
 404 }
 405
 406 static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
 407                                                         struct audsettings *as)
 408 {
 409     CaptureVoiceOut *cap;
 410
 411     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 412         if (audio_pcm_info_eq (&cap->hw.info, as)) {
 413             return cap;
 414         }
 415     }
 416     return NULL;
 417 }
 418
 419 static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd)
 420 {
 421     struct capture_callback *cb;
 422
 423 #ifdef DEBUG_CAPTURE
 424     dolog ("notification %d sent\n", cmd);
 425 #endif
 426     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
 427         cb->ops.notify (cb->opaque, cmd);
 428     }
 429 }
 430
 431 static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled)
 432 {
 433     if (cap->hw.enabled != enabled) {
 434         audcnotification_e cmd;
 435         cap->hw.enabled = enabled;
 436         cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE;
 437         audio_notify_capture (cap, cmd);
 438     }
 439 }
 440
 441 static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap)
 442 {
 443     HWVoiceOut *hw = &cap->hw;
 444     SWVoiceOut *sw;
 445     int enabled = 0;
 446
 447     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 448         if (sw->active) {
 449             enabled = 1;
 450             break;
 451         }
 452     }
 453     audio_capture_maybe_changed (cap, enabled);
 454 }
 455
 456 static void audio_detach_capture (HWVoiceOut *hw)
 457 {
 458     SWVoiceCap *sc = hw->cap_head.lh_first;
 459
 460     while (sc) {
 461         SWVoiceCap *sc1 = sc->entries.le_next;
 462         SWVoiceOut *sw = &sc->sw;
 463         CaptureVoiceOut *cap = sc->cap;
 464         int was_active = sw->active;
 465
 466         if (sw->rate) {
 467             st_rate_stop (sw->rate);
 468             sw->rate = NULL;
 469         }
 470
 471         QLIST_REMOVE (sw, entries);
 472         QLIST_REMOVE (sc, entries);
 473         g_free (sc);
 474         if (was_active) {
 475             /* We have removed soft voice from the capture:
 476                this might have changed the overall status of the capture
 477                since this might have been the only active voice */
 478             audio_recalc_and_notify_capture (cap);
 479         }
 480         sc = sc1;
 481     }
 482 }
 483
 484 static int audio_attach_capture (HWVoiceOut *hw)
 485 {
 486     AudioState *s = hw->s;
 487     CaptureVoiceOut *cap;
 488
 489     audio_detach_capture (hw);
 490     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 491         SWVoiceCap *sc;
 492         SWVoiceOut *sw;
 493         HWVoiceOut *hw_cap = &cap->hw;
 494
 495         sc = g_malloc0(sizeof(*sc));
 496
 497         sc->cap = cap;
 498         sw = &sc->sw;
 499         sw->hw = hw_cap;
 500         sw->info = hw->info;
 501         sw->empty = 1;
 502         sw->active = hw->enabled;
 503         sw->conv = noop_conv;
 504         sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
 505         sw->vol = nominal_volume;
 506         sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
 507         if (!sw->rate) {
 508             dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw));
 509             g_free (sw);
 510             return -1;
 511         }
 512         QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
 513         QLIST_INSERT_HEAD (&hw->cap_head, sc, entries);
 514 #ifdef DEBUG_CAPTURE
 515         sw->name = g_strdup_printf ("for %p %d,%d,%d",
 516                                     hw, sw->info.freq, sw->info.bits,
 517                                     sw->info.nchannels);
 518         dolog ("Added %s active = %d\n", sw->name, sw->active);
 519 #endif
 520         if (sw->active) {
 521             audio_capture_maybe_changed (cap, 1);
 522         }
 523     }
 524     return 0;
 525 }
 526
 527 /*
 528  * Hard voice (capture)
 529  */
 530 static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 531 {
 532     SWVoiceIn *sw;
 533     size_t m = hw->total_samples_captured;
 534
 535     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 536         if (sw->active) {
 537             m = MIN (m, sw->total_hw_samples_acquired);
 538         }
 539     }
 540     return m;
 541 }
 542
 543 static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw)
 544 {
 545     size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 546     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 547         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 548         return 0;
 549     }
 550     return live;
 551 }
 552
 553 static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 554 {
 555     size_t clipped = 0;
 556     size_t pos = hw->mix_buf->pos;
 557
 558     while (len) {
 559         st_sample *src = hw->mix_buf->samples + pos;
 560         uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
 561         size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
 562         size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 563
 564         hw->clip(dst, src, samples_to_clip);
 565
 566         pos = (pos + samples_to_clip) % hw->mix_buf->size;
 567         len -= samples_to_clip;
 568         clipped += samples_to_clip;
 569     }
 570 }
 571
 572 /*
 573  * Soft voice (capture)
 574  */
 575 static size_t audio_pcm_sw_get_rpos_in(SWVoiceIn *sw)
 576 {
 577     HWVoiceIn *hw = sw->hw;
 578     ssize_t live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 579     ssize_t rpos;
 580
 581     if (audio_bug(__func__, live < 0 || live > hw->conv_buf->size)) {
 582         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 583         return 0;
 584     }
 585
 586     rpos = hw->conv_buf->pos - live;
 587     if (rpos >= 0) {
 588         return rpos;
 589     }
 590     else {
 591         return hw->conv_buf->size + rpos;
 592     }
 593 }
 594
 595 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 596 {
 597     HWVoiceIn *hw = sw->hw;
 598     size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 599     struct st_sample *src, *dst = sw->buf;
 600
 601     rpos = audio_pcm_sw_get_rpos_in(sw) % hw->conv_buf->size;
 602
 603     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 604     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 605         dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 606         return 0;
 607     }
 608
 609     samples = size / sw->info.bytes_per_frame;
 610     if (!live) {
 611         return 0;
 612     }
 613
 614     swlim = (live * sw->ratio) >> 32;
 615     swlim = MIN (swlim, samples);
 616
 617     while (swlim) {
 618         src = hw->conv_buf->samples + rpos;
 619         if (hw->conv_buf->pos > rpos) {
 620             isamp = hw->conv_buf->pos - rpos;
 621         } else {
 622             isamp = hw->conv_buf->size - rpos;
 623         }
 624
 625         if (!isamp) {
 626             break;
 627         }
 628         osamp = swlim;
 629
 630         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 631         swlim -= osamp;
 632         rpos = (rpos + isamp) % hw->conv_buf->size;
 633         dst += osamp;
 634         ret += osamp;
 635         total += isamp;
 636     }
 637
 638     if (!hw->pcm_ops->volume_in) {
 639         mixeng_volume (sw->buf, ret, &sw->vol);
 640     }
 641
 642     sw->clip (buf, sw->buf, ret);
 643     sw->total_hw_samples_acquired += total;
 644     return ret * sw->info.bytes_per_frame;
 645 }
 646
 647 /*
 648  * Hard voice (playback)
 649  */
 650 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 651 {
 652     SWVoiceOut *sw;
 653     size_t m = SIZE_MAX;
 654     int nb_live = 0;
 655
 656     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 657         if (sw->active || !sw->empty) {
 658             m = MIN (m, sw->total_hw_samples_mixed);
 659             nb_live += 1;
 660         }
 661     }
 662
 663     *nb_livep = nb_live;
 664     return m;
 665 }
 666
 667 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 668 {
 669     size_t smin;
 670     int nb_live1;
 671
 672     smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 673     if (nb_live) {
 674         *nb_live = nb_live1;
 675     }
 676
 677     if (nb_live1) {
 678         size_t live = smin;
 679
 680         if (audio_bug(__func__, live > hw->mix_buf->size)) {
 681             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 682             return 0;
 683         }
 684         return live;
 685     }
 686     return 0;
 687 }
 688
 689 /*
 690  * Soft voice (playback)
 691  */
 692 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 693 {
 694     size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 695     size_t ret = 0, pos = 0, total = 0;
 696
 697     if (!sw) {
 698         return size;
 699     }
 700
 701     hwsamples = sw->hw->mix_buf->size;
 702
 703     live = sw->total_hw_samples_mixed;
 704     if (audio_bug(__func__, live > hwsamples)) {
 705         dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 706         return 0;
 707     }
 708
 709     if (live == hwsamples) {
 710 #ifdef DEBUG_OUT
 711         dolog ("%s is full %d\n", sw->name, live);
 712 #endif
 713         return 0;
 714     }
 715
 716     wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 717     samples = size / sw->info.bytes_per_frame;
 718
 719     dead = hwsamples - live;
 720     swlim = ((int64_t) dead << 32) / sw->ratio;
 721     swlim = MIN (swlim, samples);
 722     if (swlim) {
 723         sw->conv (sw->buf, buf, swlim);
 724
 725         if (!sw->hw->pcm_ops->volume_out) {
 726             mixeng_volume (sw->buf, swlim, &sw->vol);
 727         }
 728     }
 729
 730     while (swlim) {
 731         dead = hwsamples - live;
 732         left = hwsamples - wpos;
 733         blck = MIN (dead, left);
 734         if (!blck) {
 735             break;
 736         }
 737         isamp = swlim;
 738         osamp = blck;
 739         st_rate_flow_mix (
 740             sw->rate,
 741             sw->buf + pos,
 742             sw->hw->mix_buf->samples + wpos,
 743             &isamp,
 744             &osamp
 745             );
 746         ret += isamp;
 747         swlim -= isamp;
 748         pos += isamp;
 749         live += osamp;
 750         wpos = (wpos + osamp) % hwsamples;
 751         total += osamp;
 752     }
 753
 754     sw->total_hw_samples_mixed += total;
 755     sw->empty = sw->total_hw_samples_mixed == 0;
 756
 757 #ifdef DEBUG_OUT
 758     dolog (
 759         "%s: write size %zu ret %zu total sw %zu\n",
 760         SW_NAME (sw),
 761         size / sw->info.bytes_per_frame,
 762         ret,
 763         sw->total_hw_samples_mixed
 764         );
 765 #endif
 766
 767     return ret * sw->info.bytes_per_frame;
 768 }
 769
 770 #ifdef DEBUG_AUDIO
 771 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 772 {
 773     dolog ("%s: bits %d, sign %d, freq %d, nchan %d\n",
 774            cap, info->bits, info->sign, info->freq, info->nchannels);
 775 }
 776 #endif
 777
 778 #define DAC
 779 #include "audio_template.h"
 780 #undef DAC
 781 #include "audio_template.h"
 782
 783 /*
 784  * Timer
 785  */
 786 static int audio_is_timer_needed(AudioState *s)
 787 {
 788     HWVoiceIn *hwi = NULL;
 789     HWVoiceOut *hwo = NULL;
 790
 791     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
 792         if (!hwo->poll_mode) return 1;
 793     }
 794     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
 795         if (!hwi->poll_mode) return 1;
 796     }
 797     return 0;
 798 }
 799
 800 static void audio_reset_timer (AudioState *s)
 801 {
 802     if (audio_is_timer_needed(s)) {
 803         timer_mod_anticipate_ns(s->ts,
 804             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
 805         if (!s->timer_running) {
 806             s->timer_running = true;
 807             s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 808             trace_audio_timer_start(s->period_ticks / SCALE_MS);
 809         }
 810     } else {
 811         timer_del(s->ts);
 812         if (s->timer_running) {
 813             s->timer_running = false;
 814             trace_audio_timer_stop();
 815         }
 816     }
 817 }
 818
 819 static void audio_timer (void *opaque)
 820 {
 821     int64_t now, diff;
 822     AudioState *s = opaque;
 823
 824     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 825     diff = now - s->timer_last;
 826     if (diff > s->period_ticks * 3 / 2) {
 827         trace_audio_timer_delayed(diff / SCALE_MS);
 828     }
 829     s->timer_last = now;
 830
 831     audio_run(s, "timer");
 832     audio_reset_timer(s);
 833 }
 834
 835 /*
 836  * Public API
 837  */
 838 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size)
 839 {
 840     HWVoiceOut *hw;
 841
 842     if (!sw) {
 843         /* XXX: Consider options */
 844         return size;
 845     }
 846     hw = sw->hw;
 847
 848     if (!hw->enabled) {
 849         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 850         return 0;
 851     }
 852
 853     if (audio_get_pdo_out(hw->s->dev)->mixing_engine) {
 854         return audio_pcm_sw_write(sw, buf, size);
 855     } else {
 856         return hw->pcm_ops->write(hw, buf, size);
 857     }
 858 }
 859
 860 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size)
 861 {
 862     HWVoiceIn *hw;
 863
 864     if (!sw) {
 865         /* XXX: Consider options */
 866         return size;
 867     }
 868     hw = sw->hw;
 869
 870     if (!hw->enabled) {
 871         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 872         return 0;
 873     }
 874
 875     if (audio_get_pdo_in(hw->s->dev)->mixing_engine) {
 876         return audio_pcm_sw_read(sw, buf, size);
 877     } else {
 878         return hw->pcm_ops->read(hw, buf, size);
 879     }
 880 }
 881
 882 int AUD_get_buffer_size_out(SWVoiceOut *sw)
 883 {
 884     return sw->hw->samples * sw->hw->info.bytes_per_frame;
 885 }
 886
 887 void AUD_set_active_out (SWVoiceOut *sw, int on)
 888 {
 889     HWVoiceOut *hw;
 890
 891     if (!sw) {
 892         return;
 893     }
 894
 895     hw = sw->hw;
 896     if (sw->active != on) {
 897         AudioState *s = sw->s;
 898         SWVoiceOut *temp_sw;
 899         SWVoiceCap *sc;
 900
 901         if (on) {
 902             hw->pending_disable = 0;
 903             if (!hw->enabled) {
 904                 hw->enabled = 1;
 905                 if (s->vm_running) {
 906                     if (hw->pcm_ops->enable_out) {
 907                         hw->pcm_ops->enable_out(hw, true);
 908                     }
 909                     audio_reset_timer (s);
 910                 }
 911             }
 912         }
 913         else {
 914             if (hw->enabled) {
 915                 int nb_active = 0;
 916
 917                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 918                      temp_sw = temp_sw->entries.le_next) {
 919                     nb_active += temp_sw->active != 0;
 920                 }
 921
 922                 hw->pending_disable = nb_active == 1;
 923             }
 924         }
 925
 926         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
 927             sc->sw.active = hw->enabled;
 928             if (hw->enabled) {
 929                 audio_capture_maybe_changed (sc->cap, 1);
 930             }
 931         }
 932         sw->active = on;
 933     }
 934 }
 935
 936 void AUD_set_active_in (SWVoiceIn *sw, int on)
 937 {
 938     HWVoiceIn *hw;
 939
 940     if (!sw) {
 941         return;
 942     }
 943
 944     hw = sw->hw;
 945     if (sw->active != on) {
 946         AudioState *s = sw->s;
 947         SWVoiceIn *temp_sw;
 948
 949         if (on) {
 950             if (!hw->enabled) {
 951                 hw->enabled = 1;
 952                 if (s->vm_running) {
 953                     if (hw->pcm_ops->enable_in) {
 954                         hw->pcm_ops->enable_in(hw, true);
 955                     }
 956                     audio_reset_timer (s);
 957                 }
 958             }
 959             sw->total_hw_samples_acquired = hw->total_samples_captured;
 960         }
 961         else {
 962             if (hw->enabled) {
 963                 int nb_active = 0;
 964
 965                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 966                      temp_sw = temp_sw->entries.le_next) {
 967                     nb_active += temp_sw->active != 0;
 968                 }
 969
 970                 if (nb_active == 1) {
 971                     hw->enabled = 0;
 972                     if (hw->pcm_ops->enable_in) {
 973                         hw->pcm_ops->enable_in(hw, false);
 974                     }
 975                 }
 976             }
 977         }
 978         sw->active = on;
 979     }
 980 }
 981
 982 static size_t audio_get_avail (SWVoiceIn *sw)
 983 {
 984     size_t live;
 985
 986     if (!sw) {
 987         return 0;
 988     }
 989
 990     live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
 991     if (audio_bug(__func__, live > sw->hw->conv_buf->size)) {
 992         dolog("live=%zu sw->hw->conv_buf->size=%zu\n", live,
 993               sw->hw->conv_buf->size);
 994         return 0;
 995     }
 996
 997     ldebug (
 998         "%s: get_avail live %d ret %" PRId64 "\n",
 999         SW_NAME (sw),
1000         live, (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame
1001         );
1002
1003     return (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame;
1004 }
1005
1006 static size_t audio_get_free(SWVoiceOut *sw)
1007 {
1008     size_t live, dead;
1009
1010     if (!sw) {
1011         return 0;
1012     }
1013
1014     live = sw->total_hw_samples_mixed;
1015
1016     if (audio_bug(__func__, live > sw->hw->mix_buf->size)) {
1017         dolog("live=%zu sw->hw->mix_buf->size=%zu\n", live,
1018               sw->hw->mix_buf->size);
1019         return 0;
1020     }
1021
1022     dead = sw->hw->mix_buf->size - live;
1023
1024 #ifdef DEBUG_OUT
1025     dolog ("%s: get_free live %d dead %d ret %" PRId64 "\n",
1026            SW_NAME (sw),
1027            live, dead, (((int64_t) dead << 32) / sw->ratio) *
1028            sw->info.bytes_per_frame);
1029 #endif
1030
1031     return (((int64_t) dead << 32) / sw->ratio) * sw->info.bytes_per_frame;
1032 }
1033
1034 static void audio_capture_mix_and_clear(HWVoiceOut *hw, size_t rpos,
1035                                         size_t samples)
1036 {
1037     size_t n;
1038
1039     if (hw->enabled) {
1040         SWVoiceCap *sc;
1041
1042         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1043             SWVoiceOut *sw = &sc->sw;
1044             int rpos2 = rpos;
1045
1046             n = samples;
1047             while (n) {
1048                 size_t till_end_of_hw = hw->mix_buf->size - rpos2;
1049                 size_t to_write = MIN(till_end_of_hw, n);
1050                 size_t bytes = to_write * hw->info.bytes_per_frame;
1051                 size_t written;
1052
1053                 sw->buf = hw->mix_buf->samples + rpos2;
1054                 written = audio_pcm_sw_write (sw, NULL, bytes);
1055                 if (written - bytes) {
1056                     dolog("Could not mix %zu bytes into a capture "
1057                           "buffer, mixed %zu\n",
1058                           bytes, written);
1059                     break;
1060                 }
1061                 n -= to_write;
1062                 rpos2 = (rpos2 + to_write) % hw->mix_buf->size;
1063             }
1064         }
1065     }
1066
1067     n = MIN(samples, hw->mix_buf->size - rpos);
1068     mixeng_clear(hw->mix_buf->samples + rpos, n);
1069     mixeng_clear(hw->mix_buf->samples, samples - n);
1070 }
1071
1072 static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
1073 {
1074     size_t clipped = 0;
1075
1076     while (live) {
1077         size_t size, decr, proc;
1078         void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
1079         if (!buf) {
1080             /* retrying will likely won't help, drop everything. */
1081             hw->mix_buf->pos = (hw->mix_buf->pos + live) % hw->mix_buf->size;
1082             return clipped + live;
1083         }
1084
1085         decr = MIN(size / hw->info.bytes_per_frame, live);
1086         audio_pcm_hw_clip_out(hw, buf, decr);
1087         proc = hw->pcm_ops->put_buffer_out(hw, buf,
1088                                            decr * hw->info.bytes_per_frame) /
1089             hw->info.bytes_per_frame;
1090
1091         live -= proc;
1092         clipped += proc;
1093         hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size;
1094
1095         if (proc == 0 || proc < decr) {
1096             break;
1097         }
1098     }
1099
1100     if (hw->pcm_ops->run_buffer_out) {
1101         hw->pcm_ops->run_buffer_out(hw);
1102     }
1103
1104     return clipped;
1105 }
1106
1107 static void audio_run_out (AudioState *s)
1108 {
1109     HWVoiceOut *hw = NULL;
1110     SWVoiceOut *sw;
1111
1112     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1113         while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1114             /* there is exactly 1 sw for each hw with no mixeng */
1115             sw = hw->sw_head.lh_first;
1116
1117             if (hw->pending_disable) {
1118                 hw->enabled = 0;
1119                 hw->pending_disable = 0;
1120                 if (hw->pcm_ops->enable_out) {
1121                     hw->pcm_ops->enable_out(hw, false);
1122                 }
1123             }
1124
1125             if (sw->active) {
1126                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1127             }
1128         }
1129         return;
1130     }
1131
1132     while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1133         size_t played, live, prev_rpos, free;
1134         int nb_live, cleanup_required;
1135
1136         live = audio_pcm_hw_get_live_out (hw, &nb_live);
1137         if (!nb_live) {
1138             live = 0;
1139         }
1140
1141         if (audio_bug(__func__, live > hw->mix_buf->size)) {
1142             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
1143             continue;
1144         }
1145
1146         if (hw->pending_disable && !nb_live) {
1147             SWVoiceCap *sc;
1148 #ifdef DEBUG_OUT
1149             dolog ("Disabling voice\n");
1150 #endif
1151             hw->enabled = 0;
1152             hw->pending_disable = 0;
1153             if (hw->pcm_ops->enable_out) {
1154                 hw->pcm_ops->enable_out(hw, false);
1155             }
1156             for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1157                 sc->sw.active = 0;
1158                 audio_recalc_and_notify_capture (sc->cap);
1159             }
1160             continue;
1161         }
1162
1163         if (!live) {
1164             for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1165                 if (sw->active) {
1166                     free = audio_get_free (sw);
1167                     if (free > 0) {
1168                         sw->callback.fn (sw->callback.opaque, free);
1169                     }
1170                 }
1171             }
1172             continue;
1173         }
1174
1175         prev_rpos = hw->mix_buf->pos;
1176         played = audio_pcm_hw_run_out(hw, live);
1177         replay_audio_out(&played);
1178         if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) {
1179             dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n",
1180                   hw->mix_buf->pos, hw->mix_buf->size, played);
1181             hw->mix_buf->pos = 0;
1182         }
1183
1184 #ifdef DEBUG_OUT
1185         dolog("played=%zu\n", played);
1186 #endif
1187
1188         if (played) {
1189             hw->ts_helper += played;
1190             audio_capture_mix_and_clear (hw, prev_rpos, played);
1191         }
1192
1193         cleanup_required = 0;
1194         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1195             if (!sw->active && sw->empty) {
1196                 continue;
1197             }
1198
1199             if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) {
1200                 dolog("played=%zu sw->total_hw_samples_mixed=%zu\n",
1201                       played, sw->total_hw_samples_mixed);
1202                 played = sw->total_hw_samples_mixed;
1203             }
1204
1205             sw->total_hw_samples_mixed -= played;
1206
1207             if (!sw->total_hw_samples_mixed) {
1208                 sw->empty = 1;
1209                 cleanup_required |= !sw->active && !sw->callback.fn;
1210             }
1211
1212             if (sw->active) {
1213                 free = audio_get_free (sw);
1214                 if (free > 0) {
1215                     sw->callback.fn (sw->callback.opaque, free);
1216                 }
1217             }
1218         }
1219
1220         if (cleanup_required) {
1221             SWVoiceOut *sw1;
1222
1223             sw = hw->sw_head.lh_first;
1224             while (sw) {
1225                 sw1 = sw->entries.le_next;
1226                 if (!sw->active && !sw->callback.fn) {
1227                     audio_close_out (sw);
1228                 }
1229                 sw = sw1;
1230             }
1231         }
1232     }
1233 }
1234
1235 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1236 {
1237     size_t conv = 0;
1238     STSampleBuffer *conv_buf = hw->conv_buf;
1239
1240     while (samples) {
1241         size_t proc;
1242         size_t size = samples * hw->info.bytes_per_frame;
1243         void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1244
1245         assert(size % hw->info.bytes_per_frame == 0);
1246         if (size == 0) {
1247             hw->pcm_ops->put_buffer_in(hw, buf, size);
1248             break;
1249         }
1250
1251         proc = MIN(size / hw->info.bytes_per_frame,
1252                    conv_buf->size - conv_buf->pos);
1253
1254         hw->conv(conv_buf->samples + conv_buf->pos, buf, proc);
1255         conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
1256
1257         samples -= proc;
1258         conv += proc;
1259         hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1260     }
1261
1262     return conv;
1263 }
1264
1265 static void audio_run_in (AudioState *s)
1266 {
1267     HWVoiceIn *hw = NULL;
1268
1269     if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1270         while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1271             /* there is exactly 1 sw for each hw with no mixeng */
1272             SWVoiceIn *sw = hw->sw_head.lh_first;
1273             if (sw->active) {
1274                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1275             }
1276         }
1277         return;
1278     }
1279
1280     while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1281         SWVoiceIn *sw;
1282         size_t captured = 0, min;
1283
1284         if (replay_mode != REPLAY_MODE_PLAY) {
1285             captured = audio_pcm_hw_run_in(
1286                 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1287         }
1288         replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1289                         hw->conv_buf->size);
1290
1291         min = audio_pcm_hw_find_min_in (hw);
1292         hw->total_samples_captured += captured - min;
1293         hw->ts_helper += captured;
1294
1295         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1296             sw->total_hw_samples_acquired -= min;
1297
1298             if (sw->active) {
1299                 size_t avail;
1300
1301                 avail = audio_get_avail (sw);
1302                 if (avail > 0) {
1303                     sw->callback.fn (sw->callback.opaque, avail);
1304                 }
1305             }
1306         }
1307     }
1308 }
1309
1310 static void audio_run_capture (AudioState *s)
1311 {
1312     CaptureVoiceOut *cap;
1313
1314     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1315         size_t live, rpos, captured;
1316         HWVoiceOut *hw = &cap->hw;
1317         SWVoiceOut *sw;
1318
1319         captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1320         rpos = hw->mix_buf->pos;
1321         while (live) {
1322             size_t left = hw->mix_buf->size - rpos;
1323             size_t to_capture = MIN(live, left);
1324             struct st_sample *src;
1325             struct capture_callback *cb;
1326
1327             src = hw->mix_buf->samples + rpos;
1328             hw->clip (cap->buf, src, to_capture);
1329             mixeng_clear (src, to_capture);
1330
1331             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1332                 cb->ops.capture (cb->opaque, cap->buf,
1333                                  to_capture * hw->info.bytes_per_frame);
1334             }
1335             rpos = (rpos + to_capture) % hw->mix_buf->size;
1336             live -= to_capture;
1337         }
1338         hw->mix_buf->pos = rpos;
1339
1340         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1341             if (!sw->active && sw->empty) {
1342                 continue;
1343             }
1344
1345             if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1346                 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1347                       captured, sw->total_hw_samples_mixed);
1348                 captured = sw->total_hw_samples_mixed;
1349             }
1350
1351             sw->total_hw_samples_mixed -= captured;
1352             sw->empty = sw->total_hw_samples_mixed == 0;
1353         }
1354     }
1355 }
1356
1357 void audio_run(AudioState *s, const char *msg)
1358 {
1359     audio_run_out(s);
1360     audio_run_in(s);
1361     audio_run_capture(s);
1362
1363 #ifdef DEBUG_POLL
1364     {
1365         static double prevtime;
1366         double currtime;
1367         struct timeval tv;
1368
1369         if (gettimeofday (&tv, NULL)) {
1370             perror ("audio_run: gettimeofday");
1371             return;
1372         }
1373
1374         currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1375         dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1376         prevtime = currtime;
1377     }
1378 #endif
1379 }
1380
1381 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1382 {
1383     ssize_t start;
1384
1385     if (unlikely(!hw->buf_emul)) {
1386         size_t calc_size = hw->conv_buf->size * hw->info.bytes_per_frame;
1387         hw->buf_emul = g_malloc(calc_size);
1388         hw->size_emul = calc_size;
1389         hw->pos_emul = hw->pending_emul = 0;
1390     }
1391
1392     while (hw->pending_emul < hw->size_emul) {
1393         size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1394                               hw->size_emul - hw->pending_emul);
1395         size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1396                                         read_len);
1397         hw->pending_emul += read;
1398         hw->pos_emul = (hw->pos_emul + read) % hw->size_emul;
1399         if (read < read_len) {
1400             break;
1401         }
1402     }
1403
1404     start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1405     if (start < 0) {
1406         start += hw->size_emul;
1407     }
1408     assert(start >= 0 && start < hw->size_emul);
1409
1410     *size = MIN(hw->pending_emul, hw->size_emul - start);
1411     return hw->buf_emul + start;
1412 }
1413
1414 void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
1415 {
1416     assert(size <= hw->pending_emul);
1417     hw->pending_emul -= size;
1418 }
1419
1420 void audio_generic_run_buffer_out(HWVoiceOut *hw)
1421 {
1422     while (hw->pending_emul) {
1423         size_t write_len, written;
1424         ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1425
1426         if (start < 0) {
1427             start += hw->size_emul;
1428         }
1429         assert(start >= 0 && start < hw->size_emul);
1430
1431         write_len = MIN(hw->pending_emul, hw->size_emul - start);
1432
1433         written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1434         hw->pending_emul -= written;
1435
1436         if (written < write_len) {
1437             break;
1438         }
1439     }
1440 }
1441
1442 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1443 {
1444     if (unlikely(!hw->buf_emul)) {
1445         size_t calc_size = hw->mix_buf->size * hw->info.bytes_per_frame;
1446
1447         hw->buf_emul = g_malloc(calc_size);
1448         hw->size_emul = calc_size;
1449         hw->pos_emul = hw->pending_emul = 0;
1450     }
1451
1452     *size = MIN(hw->size_emul - hw->pending_emul,
1453                 hw->size_emul - hw->pos_emul);
1454     return hw->buf_emul + hw->pos_emul;
1455 }
1456
1457 size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
1458 {
1459     assert(buf == hw->buf_emul + hw->pos_emul &&
1460            size + hw->pending_emul <= hw->size_emul);
1461
1462     hw->pending_emul += size;
1463     hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
1464
1465     return size;
1466 }
1467
1468 size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size)
1469 {
1470     size_t dst_size, copy_size;
1471     void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1472     copy_size = MIN(size, dst_size);
1473
1474     memcpy(dst, buf, copy_size);
1475     return hw->pcm_ops->put_buffer_out(hw, dst, copy_size);
1476 }
1477
1478 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1479 {
1480     size_t src_size, copy_size;
1481     void *src = hw->pcm_ops->get_buffer_in(hw, &src_size);
1482     copy_size = MIN(size, src_size);
1483
1484     memcpy(buf, src, copy_size);
1485     hw->pcm_ops->put_buffer_in(hw, src, copy_size);
1486     return copy_size;
1487 }
1488
1489
1490 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1491                              bool msg, Audiodev *dev)
1492 {
1493     s->drv_opaque = drv->init(dev);
1494
1495     if (s->drv_opaque) {
1496         if (!drv->pcm_ops->get_buffer_in) {
1497             drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1498             drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1499         }
1500         if (!drv->pcm_ops->get_buffer_out) {
1501             drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1502             drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1503         }
1504
1505         audio_init_nb_voices_out(s, drv);
1506         audio_init_nb_voices_in(s, drv);
1507         s->drv = drv;
1508         return 0;
1509     }
1510     else {
1511         if (msg) {
1512             dolog("Could not init `%s' audio driver\n", drv->name);
1513         }
1514         return -1;
1515     }
1516 }
1517
1518 static void audio_vm_change_state_handler (void *opaque, int running,
1519                                            RunState state)
1520 {
1521     AudioState *s = opaque;
1522     HWVoiceOut *hwo = NULL;
1523     HWVoiceIn *hwi = NULL;
1524
1525     s->vm_running = running;
1526     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1527         if (hwo->pcm_ops->enable_out) {
1528             hwo->pcm_ops->enable_out(hwo, running);
1529         }
1530     }
1531
1532     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1533         if (hwi->pcm_ops->enable_in) {
1534             hwi->pcm_ops->enable_in(hwi, running);
1535         }
1536     }
1537     audio_reset_timer (s);
1538 }
1539
1540 static bool is_cleaning_up;
1541
1542 bool audio_is_cleaning_up(void)
1543 {
1544     return is_cleaning_up;
1545 }
1546
1547 static void free_audio_state(AudioState *s)
1548 {
1549     HWVoiceOut *hwo, *hwon;
1550     HWVoiceIn *hwi, *hwin;
1551
1552     QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1553         SWVoiceCap *sc;
1554
1555         if (hwo->enabled && hwo->pcm_ops->enable_out) {
1556             hwo->pcm_ops->enable_out(hwo, false);
1557         }
1558         hwo->pcm_ops->fini_out (hwo);
1559
1560         for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1561             CaptureVoiceOut *cap = sc->cap;
1562             struct capture_callback *cb;
1563
1564             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1565                 cb->ops.destroy (cb->opaque);
1566             }
1567         }
1568         QLIST_REMOVE(hwo, entries);
1569     }
1570
1571     QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1572         if (hwi->enabled && hwi->pcm_ops->enable_in) {
1573             hwi->pcm_ops->enable_in(hwi, false);
1574         }
1575         hwi->pcm_ops->fini_in (hwi);
1576         QLIST_REMOVE(hwi, entries);
1577     }
1578
1579     if (s->drv) {
1580         s->drv->fini (s->drv_opaque);
1581         s->drv = NULL;
1582     }
1583
1584     if (s->dev) {
1585         qapi_free_Audiodev(s->dev);
1586         s->dev = NULL;
1587     }
1588
1589     if (s->ts) {
1590         timer_free(s->ts);
1591         s->ts = NULL;
1592     }
1593
1594     g_free(s);
1595 }
1596
1597 void audio_cleanup(void)
1598 {
1599     is_cleaning_up = true;
1600     while (!QTAILQ_EMPTY(&audio_states)) {
1601         AudioState *s = QTAILQ_FIRST(&audio_states);
1602         QTAILQ_REMOVE(&audio_states, s, list);
1603         free_audio_state(s);
1604     }
1605 }
1606
1607 static const VMStateDescription vmstate_audio = {
1608     .name = "audio",
1609     .version_id = 1,
1610     .minimum_version_id = 1,
1611     .fields = (VMStateField[]) {
1612         VMSTATE_END_OF_LIST()
1613     }
1614 };
1615
1616 static void audio_validate_opts(Audiodev *dev, Error **errp);
1617
1618 static AudiodevListEntry *audiodev_find(
1619     AudiodevListHead *head, const char *drvname)
1620 {
1621     AudiodevListEntry *e;
1622     QSIMPLEQ_FOREACH(e, head, next) {
1623         if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1624             return e;
1625         }
1626     }
1627
1628     return NULL;
1629 }
1630
1631 /*
1632  * if we have dev, this function was called because of an -audiodev argument =>
1633  *   initialize a new state with it
1634  * if dev == NULL => legacy implicit initialization, return the already created
1635  *   state or create a new one
1636  */
1637 static AudioState *audio_init(Audiodev *dev, const char *name)
1638 {
1639     static bool atexit_registered;
1640     size_t i;
1641     int done = 0;
1642     const char *drvname = NULL;
1643     VMChangeStateEntry *e;
1644     AudioState *s;
1645     struct audio_driver *driver;
1646     /* silence gcc warning about uninitialized variable */
1647     AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1648
1649     if (dev) {
1650         /* -audiodev option */
1651         legacy_config = false;
1652         drvname = AudiodevDriver_str(dev->driver);
1653     } else if (!QTAILQ_EMPTY(&audio_states)) {
1654         if (!legacy_config) {
1655             dolog("Device %s: audiodev default parameter is deprecated, please "
1656                   "specify audiodev=%s\n", name,
1657                   QTAILQ_FIRST(&audio_states)->dev->id);
1658         }
1659         return QTAILQ_FIRST(&audio_states);
1660     } else {
1661         /* legacy implicit initialization */
1662         head = audio_handle_legacy_opts();
1663         /*
1664          * In case of legacy initialization, all Audiodevs in the list will have
1665          * the same configuration (except the driver), so it does't matter which
1666          * one we chose.  We need an Audiodev to set up AudioState before we can
1667          * init a driver.  Also note that dev at this point is still in the
1668          * list.
1669          */
1670         dev = QSIMPLEQ_FIRST(&head)->dev;
1671         audio_validate_opts(dev, &error_abort);
1672     }
1673
1674     s = g_malloc0(sizeof(AudioState));
1675     s->dev = dev;
1676
1677     QLIST_INIT (&s->hw_head_out);
1678     QLIST_INIT (&s->hw_head_in);
1679     QLIST_INIT (&s->cap_head);
1680     if (!atexit_registered) {
1681         atexit(audio_cleanup);
1682         atexit_registered = true;
1683     }
1684     QTAILQ_INSERT_TAIL(&audio_states, s, list);
1685
1686     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1687
1688     s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1689     s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1690
1691     if (s->nb_hw_voices_out <= 0) {
1692         dolog ("Bogus number of playback voices %d, setting to 1\n",
1693                s->nb_hw_voices_out);
1694         s->nb_hw_voices_out = 1;
1695     }
1696
1697     if (s->nb_hw_voices_in <= 0) {
1698         dolog ("Bogus number of capture voices %d, setting to 0\n",
1699                s->nb_hw_voices_in);
1700         s->nb_hw_voices_in = 0;
1701     }
1702
1703     if (drvname) {
1704         driver = audio_driver_lookup(drvname);
1705         if (driver) {
1706             done = !audio_driver_init(s, driver, true, dev);
1707         } else {
1708             dolog ("Unknown audio driver `%s'\n", drvname);
1709         }
1710     } else {
1711         for (i = 0; audio_prio_list[i]; i++) {
1712             AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1713             driver = audio_driver_lookup(audio_prio_list[i]);
1714
1715             if (e && driver) {
1716                 s->dev = dev = e->dev;
1717                 audio_validate_opts(dev, &error_abort);
1718                 done = !audio_driver_init(s, driver, false, dev);
1719                 if (done) {
1720                     e->dev = NULL;
1721                     break;
1722                 }
1723             }
1724         }
1725     }
1726     audio_free_audiodev_list(&head);
1727
1728     if (!done) {
1729         driver = audio_driver_lookup("none");
1730         done = !audio_driver_init(s, driver, false, dev);
1731         assert(done);
1732         dolog("warning: Using timer based audio emulation\n");
1733     }
1734
1735     if (dev->timer_period <= 0) {
1736         s->period_ticks = 1;
1737     } else {
1738         s->period_ticks = dev->timer_period * (int64_t)SCALE_US;
1739     }
1740
1741     e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1742     if (!e) {
1743         dolog ("warning: Could not register change state handler\n"
1744                "(Audio can continue looping even after stopping the VM)\n");
1745     }
1746
1747     QLIST_INIT (&s->card_head);
1748     vmstate_register (NULL, 0, &vmstate_audio, s);
1749     return s;
1750 }
1751
1752 void audio_free_audiodev_list(AudiodevListHead *head)
1753 {
1754     AudiodevListEntry *e;
1755     while ((e = QSIMPLEQ_FIRST(head))) {
1756         QSIMPLEQ_REMOVE_HEAD(head, next);
1757         qapi_free_Audiodev(e->dev);
1758         g_free(e);
1759     }
1760 }
1761
1762 void AUD_register_card (const char *name, QEMUSoundCard *card)
1763 {
1764     if (!card->state) {
1765         card->state = audio_init(NULL, name);
1766     }
1767
1768     card->name = g_strdup (name);
1769     memset (&card->entries, 0, sizeof (card->entries));
1770     QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1771 }
1772
1773 void AUD_remove_card (QEMUSoundCard *card)
1774 {
1775     QLIST_REMOVE (card, entries);
1776     g_free (card->name);
1777 }
1778
1779
1780 CaptureVoiceOut *AUD_add_capture(
1781     AudioState *s,
1782     struct audsettings *as,
1783     struct audio_capture_ops *ops,
1784     void *cb_opaque
1785     )
1786 {
1787     CaptureVoiceOut *cap;
1788     struct capture_callback *cb;
1789
1790     if (!s) {
1791         if (!legacy_config) {
1792             dolog("Capturing without setting an audiodev is deprecated\n");
1793         }
1794         s = audio_init(NULL, NULL);
1795     }
1796
1797     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1798         dolog("Can't capture with mixeng disabled\n");
1799         return NULL;
1800     }
1801
1802     if (audio_validate_settings (as)) {
1803         dolog ("Invalid settings were passed when trying to add capture\n");
1804         audio_print_settings (as);
1805         return NULL;
1806     }
1807
1808     cb = g_malloc0(sizeof(*cb));
1809     cb->ops = *ops;
1810     cb->opaque = cb_opaque;
1811
1812     cap = audio_pcm_capture_find_specific(s, as);
1813     if (cap) {
1814         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1815         return cap;
1816     }
1817     else {
1818         HWVoiceOut *hw;
1819         CaptureVoiceOut *cap;
1820
1821         cap = g_malloc0(sizeof(*cap));
1822
1823         hw = &cap->hw;
1824         hw->s = s;
1825         QLIST_INIT (&hw->sw_head);
1826         QLIST_INIT (&cap->cb_head);
1827
1828         /* XXX find a more elegant way */
1829         hw->samples = 4096 * 4;
1830         audio_pcm_hw_alloc_resources_out(hw);
1831
1832         audio_pcm_init_info (&hw->info, as);
1833
1834         cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1835
1836         hw->clip = mixeng_clip
1837             [hw->info.nchannels == 2]
1838             [hw->info.sign]
1839             [hw->info.swap_endianness]
1840             [audio_bits_to_index (hw->info.bits)];
1841
1842         QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1843         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1844
1845         QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1846             audio_attach_capture (hw);
1847         }
1848         return cap;
1849     }
1850 }
1851
1852 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1853 {
1854     struct capture_callback *cb;
1855
1856     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1857         if (cb->opaque == cb_opaque) {
1858             cb->ops.destroy (cb_opaque);
1859             QLIST_REMOVE (cb, entries);
1860             g_free (cb);
1861
1862             if (!cap->cb_head.lh_first) {
1863                 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1864
1865                 while (sw) {
1866                     SWVoiceCap *sc = (SWVoiceCap *) sw;
1867 #ifdef DEBUG_CAPTURE
1868                     dolog ("freeing %s\n", sw->name);
1869 #endif
1870
1871                     sw1 = sw->entries.le_next;
1872                     if (sw->rate) {
1873                         st_rate_stop (sw->rate);
1874                         sw->rate = NULL;
1875                     }
1876                     QLIST_REMOVE (sw, entries);
1877                     QLIST_REMOVE (sc, entries);
1878                     g_free (sc);
1879                     sw = sw1;
1880                 }
1881                 QLIST_REMOVE (cap, entries);
1882                 g_free (cap->hw.mix_buf);
1883                 g_free (cap->buf);
1884                 g_free (cap);
1885             }
1886             return;
1887         }
1888     }
1889 }
1890
1891 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1892 {
1893     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1894     audio_set_volume_out(sw, &vol);
1895 }
1896
1897 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1898 {
1899     if (sw) {
1900         HWVoiceOut *hw = sw->hw;
1901
1902         sw->vol.mute = vol->mute;
1903         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1904         sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1905             255;
1906
1907         if (hw->pcm_ops->volume_out) {
1908             hw->pcm_ops->volume_out(hw, vol);
1909         }
1910     }
1911 }
1912
1913 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1914 {
1915     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1916     audio_set_volume_in(sw, &vol);
1917 }
1918
1919 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1920 {
1921     if (sw) {
1922         HWVoiceIn *hw = sw->hw;
1923
1924         sw->vol.mute = vol->mute;
1925         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1926         sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1927             255;
1928
1929         if (hw->pcm_ops->volume_in) {
1930             hw->pcm_ops->volume_in(hw, vol);
1931         }
1932     }
1933 }
1934
1935 void audio_create_pdos(Audiodev *dev)
1936 {
1937     switch (dev->driver) {
1938 #define CASE(DRIVER, driver, pdo_name)                              \
1939     case AUDIODEV_DRIVER_##DRIVER:                                  \
1940         if (!dev->u.driver.has_in) {                                \
1941             dev->u.driver.in = g_malloc0(                           \
1942                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1943             dev->u.driver.has_in = true;                            \
1944         }                                                           \
1945         if (!dev->u.driver.has_out) {                               \
1946             dev->u.driver.out = g_malloc0(                          \
1947                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1948             dev->u.driver.has_out = true;                           \
1949         }                                                           \
1950         break
1951
1952         CASE(NONE, none, );
1953         CASE(ALSA, alsa, Alsa);
1954         CASE(COREAUDIO, coreaudio, Coreaudio);
1955         CASE(DSOUND, dsound, );
1956         CASE(OSS, oss, Oss);
1957         CASE(PA, pa, Pa);
1958         CASE(SDL, sdl, );
1959         CASE(SPICE, spice, );
1960         CASE(WAV, wav, );
1961
1962     case AUDIODEV_DRIVER__MAX:
1963         abort();
1964     };
1965 }
1966
1967 static void audio_validate_per_direction_opts(
1968     AudiodevPerDirectionOptions *pdo, Error **errp)
1969 {
1970     if (!pdo->has_mixing_engine) {
1971         pdo->has_mixing_engine = true;
1972         pdo->mixing_engine = true;
1973     }
1974     if (!pdo->has_fixed_settings) {
1975         pdo->has_fixed_settings = true;
1976         pdo->fixed_settings = pdo->mixing_engine;
1977     }
1978     if (!pdo->fixed_settings &&
1979         (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
1980         error_setg(errp,
1981                    "You can't use frequency, channels or format with fixed-settings=off");
1982         return;
1983     }
1984     if (!pdo->mixing_engine && pdo->fixed_settings) {
1985         error_setg(errp, "You can't use fixed-settings without mixeng");
1986         return;
1987     }
1988
1989     if (!pdo->has_frequency) {
1990         pdo->has_frequency = true;
1991         pdo->frequency = 44100;
1992     }
1993     if (!pdo->has_channels) {
1994         pdo->has_channels = true;
1995         pdo->channels = 2;
1996     }
1997     if (!pdo->has_voices) {
1998         pdo->has_voices = true;
1999         pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2000     }
2001     if (!pdo->has_format) {
2002         pdo->has_format = true;
2003         pdo->format = AUDIO_FORMAT_S16;
2004     }
2005 }
2006
2007 static void audio_validate_opts(Audiodev *dev, Error **errp)
2008 {
2009     Error *err = NULL;
2010
2011     audio_create_pdos(dev);
2012
2013     audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2014     if (err) {
2015         error_propagate(errp, err);
2016         return;
2017     }
2018
2019     audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2020     if (err) {
2021         error_propagate(errp, err);
2022         return;
2023     }
2024
2025     if (!dev->has_timer_period) {
2026         dev->has_timer_period = true;
2027         dev->timer_period = 10000; /* 100Hz -> 10ms */
2028     }
2029 }
2030
2031 void audio_parse_option(const char *opt)
2032 {
2033     AudiodevListEntry *e;
2034     Audiodev *dev = NULL;
2035
2036     Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2037     visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2038     visit_free(v);
2039
2040     audio_validate_opts(dev, &error_fatal);
2041
2042     e = g_malloc0(sizeof(AudiodevListEntry));
2043     e->dev = dev;
2044     QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2045 }
2046
2047 void audio_init_audiodevs(void)
2048 {
2049     AudiodevListEntry *e;
2050
2051     QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2052         audio_init(e->dev, NULL);
2053     }
2054 }
2055
2056 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2057 {
2058     return (audsettings) {
2059         .freq = pdo->frequency,
2060         .nchannels = pdo->channels,
2061         .fmt = pdo->format,
2062         .endianness = AUDIO_HOST_ENDIANNESS,
2063     };
2064 }
2065
2066 int audioformat_bytes_per_sample(AudioFormat fmt)
2067 {
2068     switch (fmt) {
2069     case AUDIO_FORMAT_U8:
2070     case AUDIO_FORMAT_S8:
2071         return 1;
2072
2073     case AUDIO_FORMAT_U16:
2074     case AUDIO_FORMAT_S16:
2075         return 2;
2076
2077     case AUDIO_FORMAT_U32:
2078     case AUDIO_FORMAT_S32:
2079         return 4;
2080
2081     case AUDIO_FORMAT__MAX:
2082         ;
2083     }
2084     abort();
2085 }
2086
2087
2088 /* frames = freq * usec / 1e6 */
2089 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2090                         audsettings *as, int def_usecs)
2091 {
2092     uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2093     return (as->freq * usecs + 500000) / 1000000;
2094 }
2095
2096 /* samples = channels * frames = channels * freq * usec / 1e6 */
2097 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2098                          audsettings *as, int def_usecs)
2099 {
2100     return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2101 }
2102
2103 /*
2104  * bytes = bytes_per_sample * samples =
2105  *     bytes_per_sample * channels * freq * usec / 1e6
2106  */
2107 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2108                        audsettings *as, int def_usecs)
2109 {
2110     return audio_buffer_samples(pdo, as, def_usecs) *
2111         audioformat_bytes_per_sample(as->fmt);
2112 }
2113
2114 AudioState *audio_state_by_name(const char *name)
2115 {
2116     AudioState *s;
2117     QTAILQ_FOREACH(s, &audio_states, list) {
2118         assert(s->dev);
2119         if (strcmp(name, s->dev->id) == 0) {
2120             return s;
2121         }
2122     }
2123     return NULL;
2124 }
2125
2126 const char *audio_get_id(QEMUSoundCard *card)
2127 {
2128     if (card->state) {
2129         assert(card->state->dev);
2130         return card->state->dev->id;
2131     } else {
2132         return "";
2133     }
2134 }
2135
2136 void audio_rate_start(RateCtl *rate)
2137 {
2138     memset(rate, 0, sizeof(RateCtl));
2139     rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2140 }
2141
2142 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2143                             size_t bytes_avail)
2144 {
2145     int64_t now;
2146     int64_t ticks;
2147     int64_t bytes;
2148     int64_t samples;
2149     size_t ret;
2150
2151     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2152     ticks = now - rate->start_ticks;
2153     bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2154     samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2155     if (samples < 0 || samples > 65536) {
2156         AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2157         audio_rate_start(rate);
2158         samples = 0;
2159     }
2160
2161     ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2162     rate->bytes_sent += ret;
2163     return ret;
2164 }