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     case AUDIO_FORMAT_U8:
 308         mul = 1;
 309         break;
 310
 311     case AUDIO_FORMAT_S16:
 312         sign = 1;
 313         /* fall through */
 314     case AUDIO_FORMAT_U16:
 315         bits = 16;
 316         mul = 2;
 317         break;
 318
 319     case AUDIO_FORMAT_S32:
 320         sign = 1;
 321         /* fall through */
 322     case AUDIO_FORMAT_U32:
 323         bits = 32;
 324         mul = 4;
 325         break;
 326
 327     default:
 328         abort();
 329     }
 330
 331     info->freq = as->freq;
 332     info->bits = bits;
 333     info->sign = sign;
 334     info->nchannels = as->nchannels;
 335     info->bytes_per_frame = as->nchannels * mul;
 336     info->bytes_per_second = info->freq * info->bytes_per_frame;
 337     info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS);
 338 }
 339
 340 void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len)
 341 {
 342     if (!len) {
 343         return;
 344     }
 345
 346     if (info->sign) {
 347         memset(buf, 0x00, len * info->bytes_per_frame);
 348     }
 349     else {
 350         switch (info->bits) {
 351         case 8:
 352             memset(buf, 0x80, len * info->bytes_per_frame);
 353             break;
 354
 355         case 16:
 356             {
 357                 int i;
 358                 uint16_t *p = buf;
 359                 short s = INT16_MAX;
 360
 361                 if (info->swap_endianness) {
 362                     s = bswap16 (s);
 363                 }
 364
 365                 for (i = 0; i < len * info->nchannels; i++) {
 366                     p[i] = s;
 367                 }
 368             }
 369             break;
 370
 371         case 32:
 372             {
 373                 int i;
 374                 uint32_t *p = buf;
 375                 int32_t s = INT32_MAX;
 376
 377                 if (info->swap_endianness) {
 378                     s = bswap32 (s);
 379                 }
 380
 381                 for (i = 0; i < len * info->nchannels; i++) {
 382                     p[i] = s;
 383                 }
 384             }
 385             break;
 386
 387         default:
 388             AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n",
 389                      info->bits);
 390             break;
 391         }
 392     }
 393 }
 394
 395 /*
 396  * Capture
 397  */
 398 static void noop_conv (struct st_sample *dst, const void *src, int samples)
 399 {
 400     (void) src;
 401     (void) dst;
 402     (void) samples;
 403 }
 404
 405 static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
 406                                                         struct audsettings *as)
 407 {
 408     CaptureVoiceOut *cap;
 409
 410     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 411         if (audio_pcm_info_eq (&cap->hw.info, as)) {
 412             return cap;
 413         }
 414     }
 415     return NULL;
 416 }
 417
 418 static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd)
 419 {
 420     struct capture_callback *cb;
 421
 422 #ifdef DEBUG_CAPTURE
 423     dolog ("notification %d sent\n", cmd);
 424 #endif
 425     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
 426         cb->ops.notify (cb->opaque, cmd);
 427     }
 428 }
 429
 430 static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled)
 431 {
 432     if (cap->hw.enabled != enabled) {
 433         audcnotification_e cmd;
 434         cap->hw.enabled = enabled;
 435         cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE;
 436         audio_notify_capture (cap, cmd);
 437     }
 438 }
 439
 440 static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap)
 441 {
 442     HWVoiceOut *hw = &cap->hw;
 443     SWVoiceOut *sw;
 444     int enabled = 0;
 445
 446     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 447         if (sw->active) {
 448             enabled = 1;
 449             break;
 450         }
 451     }
 452     audio_capture_maybe_changed (cap, enabled);
 453 }
 454
 455 static void audio_detach_capture (HWVoiceOut *hw)
 456 {
 457     SWVoiceCap *sc = hw->cap_head.lh_first;
 458
 459     while (sc) {
 460         SWVoiceCap *sc1 = sc->entries.le_next;
 461         SWVoiceOut *sw = &sc->sw;
 462         CaptureVoiceOut *cap = sc->cap;
 463         int was_active = sw->active;
 464
 465         if (sw->rate) {
 466             st_rate_stop (sw->rate);
 467             sw->rate = NULL;
 468         }
 469
 470         QLIST_REMOVE (sw, entries);
 471         QLIST_REMOVE (sc, entries);
 472         g_free (sc);
 473         if (was_active) {
 474             /* We have removed soft voice from the capture:
 475                this might have changed the overall status of the capture
 476                since this might have been the only active voice */
 477             audio_recalc_and_notify_capture (cap);
 478         }
 479         sc = sc1;
 480     }
 481 }
 482
 483 static int audio_attach_capture (HWVoiceOut *hw)
 484 {
 485     AudioState *s = hw->s;
 486     CaptureVoiceOut *cap;
 487
 488     audio_detach_capture (hw);
 489     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 490         SWVoiceCap *sc;
 491         SWVoiceOut *sw;
 492         HWVoiceOut *hw_cap = &cap->hw;
 493
 494         sc = g_malloc0(sizeof(*sc));
 495
 496         sc->cap = cap;
 497         sw = &sc->sw;
 498         sw->hw = hw_cap;
 499         sw->info = hw->info;
 500         sw->empty = 1;
 501         sw->active = hw->enabled;
 502         sw->conv = noop_conv;
 503         sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
 504         sw->vol = nominal_volume;
 505         sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
 506         if (!sw->rate) {
 507             dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw));
 508             g_free (sw);
 509             return -1;
 510         }
 511         QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
 512         QLIST_INSERT_HEAD (&hw->cap_head, sc, entries);
 513 #ifdef DEBUG_CAPTURE
 514         sw->name = g_strdup_printf ("for %p %d,%d,%d",
 515                                     hw, sw->info.freq, sw->info.bits,
 516                                     sw->info.nchannels);
 517         dolog ("Added %s active = %d\n", sw->name, sw->active);
 518 #endif
 519         if (sw->active) {
 520             audio_capture_maybe_changed (cap, 1);
 521         }
 522     }
 523     return 0;
 524 }
 525
 526 /*
 527  * Hard voice (capture)
 528  */
 529 static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 530 {
 531     SWVoiceIn *sw;
 532     size_t m = hw->total_samples_captured;
 533
 534     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 535         if (sw->active) {
 536             m = MIN (m, sw->total_hw_samples_acquired);
 537         }
 538     }
 539     return m;
 540 }
 541
 542 static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw)
 543 {
 544     size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 545     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 546         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 547         return 0;
 548     }
 549     return live;
 550 }
 551
 552 static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 553 {
 554     size_t clipped = 0;
 555     size_t pos = hw->mix_buf->pos;
 556
 557     while (len) {
 558         st_sample *src = hw->mix_buf->samples + pos;
 559         uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
 560         size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
 561         size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 562
 563         hw->clip(dst, src, samples_to_clip);
 564
 565         pos = (pos + samples_to_clip) % hw->mix_buf->size;
 566         len -= samples_to_clip;
 567         clipped += samples_to_clip;
 568     }
 569 }
 570
 571 /*
 572  * Soft voice (capture)
 573  */
 574 static size_t audio_pcm_sw_get_rpos_in(SWVoiceIn *sw)
 575 {
 576     HWVoiceIn *hw = sw->hw;
 577     ssize_t live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 578     ssize_t rpos;
 579
 580     if (audio_bug(__func__, live < 0 || live > hw->conv_buf->size)) {
 581         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 582         return 0;
 583     }
 584
 585     rpos = hw->conv_buf->pos - live;
 586     if (rpos >= 0) {
 587         return rpos;
 588     }
 589     else {
 590         return hw->conv_buf->size + rpos;
 591     }
 592 }
 593
 594 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 595 {
 596     HWVoiceIn *hw = sw->hw;
 597     size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 598     struct st_sample *src, *dst = sw->buf;
 599
 600     rpos = audio_pcm_sw_get_rpos_in(sw) % hw->conv_buf->size;
 601
 602     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 603     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 604         dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 605         return 0;
 606     }
 607
 608     samples = size / sw->info.bytes_per_frame;
 609     if (!live) {
 610         return 0;
 611     }
 612
 613     swlim = (live * sw->ratio) >> 32;
 614     swlim = MIN (swlim, samples);
 615
 616     while (swlim) {
 617         src = hw->conv_buf->samples + rpos;
 618         if (hw->conv_buf->pos > rpos) {
 619             isamp = hw->conv_buf->pos - rpos;
 620         } else {
 621             isamp = hw->conv_buf->size - rpos;
 622         }
 623
 624         if (!isamp) {
 625             break;
 626         }
 627         osamp = swlim;
 628
 629         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 630         swlim -= osamp;
 631         rpos = (rpos + isamp) % hw->conv_buf->size;
 632         dst += osamp;
 633         ret += osamp;
 634         total += isamp;
 635     }
 636
 637     if (!hw->pcm_ops->volume_in) {
 638         mixeng_volume (sw->buf, ret, &sw->vol);
 639     }
 640
 641     sw->clip (buf, sw->buf, ret);
 642     sw->total_hw_samples_acquired += total;
 643     return ret * sw->info.bytes_per_frame;
 644 }
 645
 646 /*
 647  * Hard voice (playback)
 648  */
 649 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 650 {
 651     SWVoiceOut *sw;
 652     size_t m = SIZE_MAX;
 653     int nb_live = 0;
 654
 655     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 656         if (sw->active || !sw->empty) {
 657             m = MIN (m, sw->total_hw_samples_mixed);
 658             nb_live += 1;
 659         }
 660     }
 661
 662     *nb_livep = nb_live;
 663     return m;
 664 }
 665
 666 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 667 {
 668     size_t smin;
 669     int nb_live1;
 670
 671     smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 672     if (nb_live) {
 673         *nb_live = nb_live1;
 674     }
 675
 676     if (nb_live1) {
 677         size_t live = smin;
 678
 679         if (audio_bug(__func__, live > hw->mix_buf->size)) {
 680             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 681             return 0;
 682         }
 683         return live;
 684     }
 685     return 0;
 686 }
 687
 688 /*
 689  * Soft voice (playback)
 690  */
 691 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 692 {
 693     size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 694     size_t ret = 0, pos = 0, total = 0;
 695
 696     if (!sw) {
 697         return size;
 698     }
 699
 700     hwsamples = sw->hw->mix_buf->size;
 701
 702     live = sw->total_hw_samples_mixed;
 703     if (audio_bug(__func__, live > hwsamples)) {
 704         dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 705         return 0;
 706     }
 707
 708     if (live == hwsamples) {
 709 #ifdef DEBUG_OUT
 710         dolog ("%s is full %d\n", sw->name, live);
 711 #endif
 712         return 0;
 713     }
 714
 715     wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 716     samples = size / sw->info.bytes_per_frame;
 717
 718     dead = hwsamples - live;
 719     swlim = ((int64_t) dead << 32) / sw->ratio;
 720     swlim = MIN (swlim, samples);
 721     if (swlim) {
 722         sw->conv (sw->buf, buf, swlim);
 723
 724         if (!sw->hw->pcm_ops->volume_out) {
 725             mixeng_volume (sw->buf, swlim, &sw->vol);
 726         }
 727     }
 728
 729     while (swlim) {
 730         dead = hwsamples - live;
 731         left = hwsamples - wpos;
 732         blck = MIN (dead, left);
 733         if (!blck) {
 734             break;
 735         }
 736         isamp = swlim;
 737         osamp = blck;
 738         st_rate_flow_mix (
 739             sw->rate,
 740             sw->buf + pos,
 741             sw->hw->mix_buf->samples + wpos,
 742             &isamp,
 743             &osamp
 744             );
 745         ret += isamp;
 746         swlim -= isamp;
 747         pos += isamp;
 748         live += osamp;
 749         wpos = (wpos + osamp) % hwsamples;
 750         total += osamp;
 751     }
 752
 753     sw->total_hw_samples_mixed += total;
 754     sw->empty = sw->total_hw_samples_mixed == 0;
 755
 756 #ifdef DEBUG_OUT
 757     dolog (
 758         "%s: write size %zu ret %zu total sw %zu\n",
 759         SW_NAME (sw),
 760         size / sw->info.bytes_per_frame,
 761         ret,
 762         sw->total_hw_samples_mixed
 763         );
 764 #endif
 765
 766     return ret * sw->info.bytes_per_frame;
 767 }
 768
 769 #ifdef DEBUG_AUDIO
 770 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 771 {
 772     dolog ("%s: bits %d, sign %d, freq %d, nchan %d\n",
 773            cap, info->bits, info->sign, info->freq, info->nchannels);
 774 }
 775 #endif
 776
 777 #define DAC
 778 #include "audio_template.h"
 779 #undef DAC
 780 #include "audio_template.h"
 781
 782 /*
 783  * Timer
 784  */
 785 static int audio_is_timer_needed(AudioState *s)
 786 {
 787     HWVoiceIn *hwi = NULL;
 788     HWVoiceOut *hwo = NULL;
 789
 790     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
 791         if (!hwo->poll_mode) return 1;
 792     }
 793     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
 794         if (!hwi->poll_mode) return 1;
 795     }
 796     return 0;
 797 }
 798
 799 static void audio_reset_timer (AudioState *s)
 800 {
 801     if (audio_is_timer_needed(s)) {
 802         timer_mod_anticipate_ns(s->ts,
 803             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
 804         if (!s->timer_running) {
 805             s->timer_running = true;
 806             s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 807             trace_audio_timer_start(s->period_ticks / SCALE_MS);
 808         }
 809     } else {
 810         timer_del(s->ts);
 811         if (s->timer_running) {
 812             s->timer_running = false;
 813             trace_audio_timer_stop();
 814         }
 815     }
 816 }
 817
 818 static void audio_timer (void *opaque)
 819 {
 820     int64_t now, diff;
 821     AudioState *s = opaque;
 822
 823     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 824     diff = now - s->timer_last;
 825     if (diff > s->period_ticks * 3 / 2) {
 826         trace_audio_timer_delayed(diff / SCALE_MS);
 827     }
 828     s->timer_last = now;
 829
 830     audio_run(s, "timer");
 831     audio_reset_timer(s);
 832 }
 833
 834 /*
 835  * Public API
 836  */
 837 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size)
 838 {
 839     HWVoiceOut *hw;
 840
 841     if (!sw) {
 842         /* XXX: Consider options */
 843         return size;
 844     }
 845     hw = sw->hw;
 846
 847     if (!hw->enabled) {
 848         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 849         return 0;
 850     }
 851
 852     if (audio_get_pdo_out(hw->s->dev)->mixing_engine) {
 853         return audio_pcm_sw_write(sw, buf, size);
 854     } else {
 855         return hw->pcm_ops->write(hw, buf, size);
 856     }
 857 }
 858
 859 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size)
 860 {
 861     HWVoiceIn *hw;
 862
 863     if (!sw) {
 864         /* XXX: Consider options */
 865         return size;
 866     }
 867     hw = sw->hw;
 868
 869     if (!hw->enabled) {
 870         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 871         return 0;
 872     }
 873
 874     if (audio_get_pdo_in(hw->s->dev)->mixing_engine) {
 875         return audio_pcm_sw_read(sw, buf, size);
 876     } else {
 877         return hw->pcm_ops->read(hw, buf, size);
 878     }
 879 }
 880
 881 int AUD_get_buffer_size_out (SWVoiceOut *sw)
 882 {
 883     return sw->hw->mix_buf->size * sw->hw->info.bytes_per_frame;
 884 }
 885
 886 void AUD_set_active_out (SWVoiceOut *sw, int on)
 887 {
 888     HWVoiceOut *hw;
 889
 890     if (!sw) {
 891         return;
 892     }
 893
 894     hw = sw->hw;
 895     if (sw->active != on) {
 896         AudioState *s = sw->s;
 897         SWVoiceOut *temp_sw;
 898         SWVoiceCap *sc;
 899
 900         if (on) {
 901             hw->pending_disable = 0;
 902             if (!hw->enabled) {
 903                 hw->enabled = 1;
 904                 if (s->vm_running) {
 905                     if (hw->pcm_ops->enable_out) {
 906                         hw->pcm_ops->enable_out(hw, true);
 907                     }
 908                     audio_reset_timer (s);
 909                 }
 910             }
 911         }
 912         else {
 913             if (hw->enabled) {
 914                 int nb_active = 0;
 915
 916                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 917                      temp_sw = temp_sw->entries.le_next) {
 918                     nb_active += temp_sw->active != 0;
 919                 }
 920
 921                 hw->pending_disable = nb_active == 1;
 922             }
 923         }
 924
 925         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
 926             sc->sw.active = hw->enabled;
 927             if (hw->enabled) {
 928                 audio_capture_maybe_changed (sc->cap, 1);
 929             }
 930         }
 931         sw->active = on;
 932     }
 933 }
 934
 935 void AUD_set_active_in (SWVoiceIn *sw, int on)
 936 {
 937     HWVoiceIn *hw;
 938
 939     if (!sw) {
 940         return;
 941     }
 942
 943     hw = sw->hw;
 944     if (sw->active != on) {
 945         AudioState *s = sw->s;
 946         SWVoiceIn *temp_sw;
 947
 948         if (on) {
 949             if (!hw->enabled) {
 950                 hw->enabled = 1;
 951                 if (s->vm_running) {
 952                     if (hw->pcm_ops->enable_in) {
 953                         hw->pcm_ops->enable_in(hw, true);
 954                     }
 955                     audio_reset_timer (s);
 956                 }
 957             }
 958             sw->total_hw_samples_acquired = hw->total_samples_captured;
 959         }
 960         else {
 961             if (hw->enabled) {
 962                 int nb_active = 0;
 963
 964                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 965                      temp_sw = temp_sw->entries.le_next) {
 966                     nb_active += temp_sw->active != 0;
 967                 }
 968
 969                 if (nb_active == 1) {
 970                     hw->enabled = 0;
 971                     if (hw->pcm_ops->enable_in) {
 972                         hw->pcm_ops->enable_in(hw, false);
 973                     }
 974                 }
 975             }
 976         }
 977         sw->active = on;
 978     }
 979 }
 980
 981 static size_t audio_get_avail (SWVoiceIn *sw)
 982 {
 983     size_t live;
 984
 985     if (!sw) {
 986         return 0;
 987     }
 988
 989     live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
 990     if (audio_bug(__func__, live > sw->hw->conv_buf->size)) {
 991         dolog("live=%zu sw->hw->conv_buf->size=%zu\n", live,
 992               sw->hw->conv_buf->size);
 993         return 0;
 994     }
 995
 996     ldebug (
 997         "%s: get_avail live %d ret %" PRId64 "\n",
 998         SW_NAME (sw),
 999         live, (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame
1000         );
1001
1002     return (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame;
1003 }
1004
1005 static size_t audio_get_free(SWVoiceOut *sw)
1006 {
1007     size_t live, dead;
1008
1009     if (!sw) {
1010         return 0;
1011     }
1012
1013     live = sw->total_hw_samples_mixed;
1014
1015     if (audio_bug(__func__, live > sw->hw->mix_buf->size)) {
1016         dolog("live=%zu sw->hw->mix_buf->size=%zu\n", live,
1017               sw->hw->mix_buf->size);
1018         return 0;
1019     }
1020
1021     dead = sw->hw->mix_buf->size - live;
1022
1023 #ifdef DEBUG_OUT
1024     dolog ("%s: get_free live %d dead %d ret %" PRId64 "\n",
1025            SW_NAME (sw),
1026            live, dead, (((int64_t) dead << 32) / sw->ratio) *
1027            sw->info.bytes_per_frame);
1028 #endif
1029
1030     return (((int64_t) dead << 32) / sw->ratio) * sw->info.bytes_per_frame;
1031 }
1032
1033 static void audio_capture_mix_and_clear(HWVoiceOut *hw, size_t rpos,
1034                                         size_t samples)
1035 {
1036     size_t n;
1037
1038     if (hw->enabled) {
1039         SWVoiceCap *sc;
1040
1041         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1042             SWVoiceOut *sw = &sc->sw;
1043             int rpos2 = rpos;
1044
1045             n = samples;
1046             while (n) {
1047                 size_t till_end_of_hw = hw->mix_buf->size - rpos2;
1048                 size_t to_write = MIN(till_end_of_hw, n);
1049                 size_t bytes = to_write * hw->info.bytes_per_frame;
1050                 size_t written;
1051
1052                 sw->buf = hw->mix_buf->samples + rpos2;
1053                 written = audio_pcm_sw_write (sw, NULL, bytes);
1054                 if (written - bytes) {
1055                     dolog("Could not mix %zu bytes into a capture "
1056                           "buffer, mixed %zu\n",
1057                           bytes, written);
1058                     break;
1059                 }
1060                 n -= to_write;
1061                 rpos2 = (rpos2 + to_write) % hw->mix_buf->size;
1062             }
1063         }
1064     }
1065
1066     n = MIN(samples, hw->mix_buf->size - rpos);
1067     mixeng_clear(hw->mix_buf->samples + rpos, n);
1068     mixeng_clear(hw->mix_buf->samples, samples - n);
1069 }
1070
1071 static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
1072 {
1073     size_t clipped = 0;
1074
1075     while (live) {
1076         size_t size, decr, proc;
1077         void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
1078         if (!buf) {
1079             /* retrying will likely won't help, drop everything. */
1080             hw->mix_buf->pos = (hw->mix_buf->pos + live) % hw->mix_buf->size;
1081             return clipped + live;
1082         }
1083
1084         decr = MIN(size / hw->info.bytes_per_frame, live);
1085         audio_pcm_hw_clip_out(hw, buf, decr);
1086         proc = hw->pcm_ops->put_buffer_out(hw, buf,
1087                                            decr * hw->info.bytes_per_frame) /
1088             hw->info.bytes_per_frame;
1089
1090         live -= proc;
1091         clipped += proc;
1092         hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size;
1093
1094         if (proc == 0 || proc < decr) {
1095             break;
1096         }
1097     }
1098
1099     return clipped;
1100 }
1101
1102 static void audio_run_out (AudioState *s)
1103 {
1104     HWVoiceOut *hw = NULL;
1105     SWVoiceOut *sw;
1106
1107     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1108         while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1109             /* there is exactly 1 sw for each hw with no mixeng */
1110             sw = hw->sw_head.lh_first;
1111
1112             if (hw->pending_disable) {
1113                 hw->enabled = 0;
1114                 hw->pending_disable = 0;
1115                 if (hw->pcm_ops->enable_out) {
1116                     hw->pcm_ops->enable_out(hw, false);
1117                 }
1118             }
1119
1120             if (sw->active) {
1121                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1122             }
1123         }
1124         return;
1125     }
1126
1127     while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1128         size_t played, live, prev_rpos, free;
1129         int nb_live, cleanup_required;
1130
1131         live = audio_pcm_hw_get_live_out (hw, &nb_live);
1132         if (!nb_live) {
1133             live = 0;
1134         }
1135
1136         if (audio_bug(__func__, live > hw->mix_buf->size)) {
1137             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
1138             continue;
1139         }
1140
1141         if (hw->pending_disable && !nb_live) {
1142             SWVoiceCap *sc;
1143 #ifdef DEBUG_OUT
1144             dolog ("Disabling voice\n");
1145 #endif
1146             hw->enabled = 0;
1147             hw->pending_disable = 0;
1148             if (hw->pcm_ops->enable_out) {
1149                 hw->pcm_ops->enable_out(hw, false);
1150             }
1151             for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1152                 sc->sw.active = 0;
1153                 audio_recalc_and_notify_capture (sc->cap);
1154             }
1155             continue;
1156         }
1157
1158         if (!live) {
1159             for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1160                 if (sw->active) {
1161                     free = audio_get_free (sw);
1162                     if (free > 0) {
1163                         sw->callback.fn (sw->callback.opaque, free);
1164                     }
1165                 }
1166             }
1167             continue;
1168         }
1169
1170         prev_rpos = hw->mix_buf->pos;
1171         played = audio_pcm_hw_run_out(hw, live);
1172         replay_audio_out(&played);
1173         if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) {
1174             dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n",
1175                   hw->mix_buf->pos, hw->mix_buf->size, played);
1176             hw->mix_buf->pos = 0;
1177         }
1178
1179 #ifdef DEBUG_OUT
1180         dolog("played=%zu\n", played);
1181 #endif
1182
1183         if (played) {
1184             hw->ts_helper += played;
1185             audio_capture_mix_and_clear (hw, prev_rpos, played);
1186         }
1187
1188         cleanup_required = 0;
1189         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1190             if (!sw->active && sw->empty) {
1191                 continue;
1192             }
1193
1194             if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) {
1195                 dolog("played=%zu sw->total_hw_samples_mixed=%zu\n",
1196                       played, sw->total_hw_samples_mixed);
1197                 played = sw->total_hw_samples_mixed;
1198             }
1199
1200             sw->total_hw_samples_mixed -= played;
1201
1202             if (!sw->total_hw_samples_mixed) {
1203                 sw->empty = 1;
1204                 cleanup_required |= !sw->active && !sw->callback.fn;
1205             }
1206
1207             if (sw->active) {
1208                 free = audio_get_free (sw);
1209                 if (free > 0) {
1210                     sw->callback.fn (sw->callback.opaque, free);
1211                 }
1212             }
1213         }
1214
1215         if (cleanup_required) {
1216             SWVoiceOut *sw1;
1217
1218             sw = hw->sw_head.lh_first;
1219             while (sw) {
1220                 sw1 = sw->entries.le_next;
1221                 if (!sw->active && !sw->callback.fn) {
1222                     audio_close_out (sw);
1223                 }
1224                 sw = sw1;
1225             }
1226         }
1227     }
1228 }
1229
1230 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1231 {
1232     size_t conv = 0;
1233     STSampleBuffer *conv_buf = hw->conv_buf;
1234
1235     while (samples) {
1236         size_t proc;
1237         size_t size = samples * hw->info.bytes_per_frame;
1238         void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1239
1240         assert(size % hw->info.bytes_per_frame == 0);
1241         if (size == 0) {
1242             hw->pcm_ops->put_buffer_in(hw, buf, size);
1243             break;
1244         }
1245
1246         proc = MIN(size / hw->info.bytes_per_frame,
1247                    conv_buf->size - conv_buf->pos);
1248
1249         hw->conv(conv_buf->samples + conv_buf->pos, buf, proc);
1250         conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
1251
1252         samples -= proc;
1253         conv += proc;
1254         hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1255     }
1256
1257     return conv;
1258 }
1259
1260 static void audio_run_in (AudioState *s)
1261 {
1262     HWVoiceIn *hw = NULL;
1263
1264     if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1265         while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1266             /* there is exactly 1 sw for each hw with no mixeng */
1267             SWVoiceIn *sw = hw->sw_head.lh_first;
1268             if (sw->active) {
1269                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1270             }
1271         }
1272         return;
1273     }
1274
1275     while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1276         SWVoiceIn *sw;
1277         size_t captured = 0, min;
1278
1279         if (replay_mode != REPLAY_MODE_PLAY) {
1280             captured = audio_pcm_hw_run_in(
1281                 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1282         }
1283         replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1284                         hw->conv_buf->size);
1285
1286         min = audio_pcm_hw_find_min_in (hw);
1287         hw->total_samples_captured += captured - min;
1288         hw->ts_helper += captured;
1289
1290         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1291             sw->total_hw_samples_acquired -= min;
1292
1293             if (sw->active) {
1294                 size_t avail;
1295
1296                 avail = audio_get_avail (sw);
1297                 if (avail > 0) {
1298                     sw->callback.fn (sw->callback.opaque, avail);
1299                 }
1300             }
1301         }
1302     }
1303 }
1304
1305 static void audio_run_capture (AudioState *s)
1306 {
1307     CaptureVoiceOut *cap;
1308
1309     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1310         size_t live, rpos, captured;
1311         HWVoiceOut *hw = &cap->hw;
1312         SWVoiceOut *sw;
1313
1314         captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1315         rpos = hw->mix_buf->pos;
1316         while (live) {
1317             size_t left = hw->mix_buf->size - rpos;
1318             size_t to_capture = MIN(live, left);
1319             struct st_sample *src;
1320             struct capture_callback *cb;
1321
1322             src = hw->mix_buf->samples + rpos;
1323             hw->clip (cap->buf, src, to_capture);
1324             mixeng_clear (src, to_capture);
1325
1326             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1327                 cb->ops.capture (cb->opaque, cap->buf,
1328                                  to_capture * hw->info.bytes_per_frame);
1329             }
1330             rpos = (rpos + to_capture) % hw->mix_buf->size;
1331             live -= to_capture;
1332         }
1333         hw->mix_buf->pos = rpos;
1334
1335         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1336             if (!sw->active && sw->empty) {
1337                 continue;
1338             }
1339
1340             if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1341                 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1342                       captured, sw->total_hw_samples_mixed);
1343                 captured = sw->total_hw_samples_mixed;
1344             }
1345
1346             sw->total_hw_samples_mixed -= captured;
1347             sw->empty = sw->total_hw_samples_mixed == 0;
1348         }
1349     }
1350 }
1351
1352 void audio_run(AudioState *s, const char *msg)
1353 {
1354     audio_run_out(s);
1355     audio_run_in(s);
1356     audio_run_capture(s);
1357
1358 #ifdef DEBUG_POLL
1359     {
1360         static double prevtime;
1361         double currtime;
1362         struct timeval tv;
1363
1364         if (gettimeofday (&tv, NULL)) {
1365             perror ("audio_run: gettimeofday");
1366             return;
1367         }
1368
1369         currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1370         dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1371         prevtime = currtime;
1372     }
1373 #endif
1374 }
1375
1376 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1377 {
1378     ssize_t start;
1379
1380     if (unlikely(!hw->buf_emul)) {
1381         size_t calc_size = hw->conv_buf->size * hw->info.bytes_per_frame;
1382         hw->buf_emul = g_malloc(calc_size);
1383         hw->size_emul = calc_size;
1384         hw->pos_emul = hw->pending_emul = 0;
1385     }
1386
1387     while (hw->pending_emul < hw->size_emul) {
1388         size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1389                               hw->size_emul - hw->pending_emul);
1390         size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1391                                         read_len);
1392         hw->pending_emul += read;
1393         if (read < read_len) {
1394             break;
1395         }
1396     }
1397
1398     start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1399     if (start < 0) {
1400         start += hw->size_emul;
1401     }
1402     assert(start >= 0 && start < hw->size_emul);
1403
1404     *size = MIN(hw->pending_emul, hw->size_emul - start);
1405     return hw->buf_emul + start;
1406 }
1407
1408 void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
1409 {
1410     assert(size <= hw->pending_emul);
1411     hw->pending_emul -= size;
1412 }
1413
1414 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1415 {
1416     if (unlikely(!hw->buf_emul)) {
1417         size_t calc_size = hw->mix_buf->size * hw->info.bytes_per_frame;
1418
1419         hw->buf_emul = g_malloc(calc_size);
1420         hw->size_emul = calc_size;
1421         hw->pos_emul = hw->pending_emul = 0;
1422     }
1423
1424     *size = MIN(hw->size_emul - hw->pending_emul,
1425                 hw->size_emul - hw->pos_emul);
1426     return hw->buf_emul + hw->pos_emul;
1427 }
1428
1429 size_t audio_generic_put_buffer_out_nowrite(HWVoiceOut *hw, void *buf,
1430                                             size_t size)
1431 {
1432     assert(buf == hw->buf_emul + hw->pos_emul &&
1433            size + hw->pending_emul <= hw->size_emul);
1434
1435     hw->pending_emul += size;
1436     hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
1437
1438     return size;
1439 }
1440
1441 size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
1442 {
1443     audio_generic_put_buffer_out_nowrite(hw, buf, size);
1444
1445     while (hw->pending_emul) {
1446         size_t write_len, written;
1447         ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1448         if (start < 0) {
1449             start += hw->size_emul;
1450         }
1451         assert(start >= 0 && start < hw->size_emul);
1452
1453         write_len = MIN(hw->pending_emul, hw->size_emul - start);
1454
1455         written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1456         hw->pending_emul -= written;
1457
1458         if (written < write_len) {
1459             break;
1460         }
1461     }
1462
1463     /*
1464      * fake we have written everything. non-written data remain in pending_emul,
1465      * so we do not have to clip them multiple times
1466      */
1467     return size;
1468 }
1469
1470 size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size)
1471 {
1472     size_t dst_size, copy_size;
1473     void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1474     copy_size = MIN(size, dst_size);
1475
1476     memcpy(dst, buf, copy_size);
1477     return hw->pcm_ops->put_buffer_out(hw, buf, copy_size);
1478 }
1479
1480 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1481 {
1482     size_t dst_size, copy_size;
1483     void *dst = hw->pcm_ops->get_buffer_in(hw, &dst_size);
1484     copy_size = MIN(size, dst_size);
1485
1486     memcpy(dst, buf, copy_size);
1487     hw->pcm_ops->put_buffer_in(hw, buf, copy_size);
1488     return copy_size;
1489 }
1490
1491
1492 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1493                              bool msg, Audiodev *dev)
1494 {
1495     s->drv_opaque = drv->init(dev);
1496
1497     if (s->drv_opaque) {
1498         if (!drv->pcm_ops->get_buffer_in) {
1499             drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1500             drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1501         }
1502         if (!drv->pcm_ops->get_buffer_out) {
1503             drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1504             drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1505         }
1506
1507         audio_init_nb_voices_out(s, drv);
1508         audio_init_nb_voices_in(s, drv);
1509         s->drv = drv;
1510         return 0;
1511     }
1512     else {
1513         if (msg) {
1514             dolog("Could not init `%s' audio driver\n", drv->name);
1515         }
1516         return -1;
1517     }
1518 }
1519
1520 static void audio_vm_change_state_handler (void *opaque, int running,
1521                                            RunState state)
1522 {
1523     AudioState *s = opaque;
1524     HWVoiceOut *hwo = NULL;
1525     HWVoiceIn *hwi = NULL;
1526
1527     s->vm_running = running;
1528     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1529         if (hwo->pcm_ops->enable_out) {
1530             hwo->pcm_ops->enable_out(hwo, running);
1531         }
1532     }
1533
1534     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1535         if (hwi->pcm_ops->enable_in) {
1536             hwi->pcm_ops->enable_in(hwi, running);
1537         }
1538     }
1539     audio_reset_timer (s);
1540 }
1541
1542 static bool is_cleaning_up;
1543
1544 bool audio_is_cleaning_up(void)
1545 {
1546     return is_cleaning_up;
1547 }
1548
1549 static void free_audio_state(AudioState *s)
1550 {
1551     HWVoiceOut *hwo, *hwon;
1552     HWVoiceIn *hwi, *hwin;
1553
1554     QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1555         SWVoiceCap *sc;
1556
1557         if (hwo->enabled && hwo->pcm_ops->enable_out) {
1558             hwo->pcm_ops->enable_out(hwo, false);
1559         }
1560         hwo->pcm_ops->fini_out (hwo);
1561
1562         for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1563             CaptureVoiceOut *cap = sc->cap;
1564             struct capture_callback *cb;
1565
1566             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1567                 cb->ops.destroy (cb->opaque);
1568             }
1569         }
1570         QLIST_REMOVE(hwo, entries);
1571     }
1572
1573     QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1574         if (hwi->enabled && hwi->pcm_ops->enable_in) {
1575             hwi->pcm_ops->enable_in(hwi, false);
1576         }
1577         hwi->pcm_ops->fini_in (hwi);
1578         QLIST_REMOVE(hwi, entries);
1579     }
1580
1581     if (s->drv) {
1582         s->drv->fini (s->drv_opaque);
1583         s->drv = NULL;
1584     }
1585
1586     if (s->dev) {
1587         qapi_free_Audiodev(s->dev);
1588         s->dev = NULL;
1589     }
1590
1591     if (s->ts) {
1592         timer_free(s->ts);
1593         s->ts = NULL;
1594     }
1595
1596     g_free(s);
1597 }
1598
1599 void audio_cleanup(void)
1600 {
1601     is_cleaning_up = true;
1602     while (!QTAILQ_EMPTY(&audio_states)) {
1603         AudioState *s = QTAILQ_FIRST(&audio_states);
1604         QTAILQ_REMOVE(&audio_states, s, list);
1605         free_audio_state(s);
1606     }
1607 }
1608
1609 static const VMStateDescription vmstate_audio = {
1610     .name = "audio",
1611     .version_id = 1,
1612     .minimum_version_id = 1,
1613     .fields = (VMStateField[]) {
1614         VMSTATE_END_OF_LIST()
1615     }
1616 };
1617
1618 static void audio_validate_opts(Audiodev *dev, Error **errp);
1619
1620 static AudiodevListEntry *audiodev_find(
1621     AudiodevListHead *head, const char *drvname)
1622 {
1623     AudiodevListEntry *e;
1624     QSIMPLEQ_FOREACH(e, head, next) {
1625         if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1626             return e;
1627         }
1628     }
1629
1630     return NULL;
1631 }
1632
1633 /*
1634  * if we have dev, this function was called because of an -audiodev argument =>
1635  *   initialize a new state with it
1636  * if dev == NULL => legacy implicit initialization, return the already created
1637  *   state or create a new one
1638  */
1639 static AudioState *audio_init(Audiodev *dev, const char *name)
1640 {
1641     static bool atexit_registered;
1642     size_t i;
1643     int done = 0;
1644     const char *drvname = NULL;
1645     VMChangeStateEntry *e;
1646     AudioState *s;
1647     struct audio_driver *driver;
1648     /* silence gcc warning about uninitialized variable */
1649     AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1650
1651     if (dev) {
1652         /* -audiodev option */
1653         legacy_config = false;
1654         drvname = AudiodevDriver_str(dev->driver);
1655     } else if (!QTAILQ_EMPTY(&audio_states)) {
1656         if (!legacy_config) {
1657             dolog("Device %s: audiodev default parameter is deprecated, please "
1658                   "specify audiodev=%s\n", name,
1659                   QTAILQ_FIRST(&audio_states)->dev->id);
1660         }
1661         return QTAILQ_FIRST(&audio_states);
1662     } else {
1663         /* legacy implicit initialization */
1664         head = audio_handle_legacy_opts();
1665         /*
1666          * In case of legacy initialization, all Audiodevs in the list will have
1667          * the same configuration (except the driver), so it does't matter which
1668          * one we chose.  We need an Audiodev to set up AudioState before we can
1669          * init a driver.  Also note that dev at this point is still in the
1670          * list.
1671          */
1672         dev = QSIMPLEQ_FIRST(&head)->dev;
1673         audio_validate_opts(dev, &error_abort);
1674     }
1675
1676     s = g_malloc0(sizeof(AudioState));
1677     s->dev = dev;
1678
1679     QLIST_INIT (&s->hw_head_out);
1680     QLIST_INIT (&s->hw_head_in);
1681     QLIST_INIT (&s->cap_head);
1682     if (!atexit_registered) {
1683         atexit(audio_cleanup);
1684         atexit_registered = true;
1685     }
1686     QTAILQ_INSERT_TAIL(&audio_states, s, list);
1687
1688     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1689
1690     s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1691     s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1692
1693     if (s->nb_hw_voices_out <= 0) {
1694         dolog ("Bogus number of playback voices %d, setting to 1\n",
1695                s->nb_hw_voices_out);
1696         s->nb_hw_voices_out = 1;
1697     }
1698
1699     if (s->nb_hw_voices_in <= 0) {
1700         dolog ("Bogus number of capture voices %d, setting to 0\n",
1701                s->nb_hw_voices_in);
1702         s->nb_hw_voices_in = 0;
1703     }
1704
1705     if (drvname) {
1706         driver = audio_driver_lookup(drvname);
1707         if (driver) {
1708             done = !audio_driver_init(s, driver, true, dev);
1709         } else {
1710             dolog ("Unknown audio driver `%s'\n", drvname);
1711         }
1712     } else {
1713         for (i = 0; audio_prio_list[i]; i++) {
1714             AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1715             driver = audio_driver_lookup(audio_prio_list[i]);
1716
1717             if (e && driver) {
1718                 s->dev = dev = e->dev;
1719                 audio_validate_opts(dev, &error_abort);
1720                 done = !audio_driver_init(s, driver, false, dev);
1721                 if (done) {
1722                     e->dev = NULL;
1723                     break;
1724                 }
1725             }
1726         }
1727     }
1728     audio_free_audiodev_list(&head);
1729
1730     if (!done) {
1731         driver = audio_driver_lookup("none");
1732         done = !audio_driver_init(s, driver, false, dev);
1733         assert(done);
1734         dolog("warning: Using timer based audio emulation\n");
1735     }
1736
1737     if (dev->timer_period <= 0) {
1738         s->period_ticks = 1;
1739     } else {
1740         s->period_ticks = dev->timer_period * SCALE_US;
1741     }
1742
1743     e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1744     if (!e) {
1745         dolog ("warning: Could not register change state handler\n"
1746                "(Audio can continue looping even after stopping the VM)\n");
1747     }
1748
1749     QLIST_INIT (&s->card_head);
1750     vmstate_register (NULL, 0, &vmstate_audio, s);
1751     return s;
1752 }
1753
1754 void audio_free_audiodev_list(AudiodevListHead *head)
1755 {
1756     AudiodevListEntry *e;
1757     while ((e = QSIMPLEQ_FIRST(head))) {
1758         QSIMPLEQ_REMOVE_HEAD(head, next);
1759         qapi_free_Audiodev(e->dev);
1760         g_free(e);
1761     }
1762 }
1763
1764 void AUD_register_card (const char *name, QEMUSoundCard *card)
1765 {
1766     if (!card->state) {
1767         card->state = audio_init(NULL, name);
1768     }
1769
1770     card->name = g_strdup (name);
1771     memset (&card->entries, 0, sizeof (card->entries));
1772     QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1773 }
1774
1775 void AUD_remove_card (QEMUSoundCard *card)
1776 {
1777     QLIST_REMOVE (card, entries);
1778     g_free (card->name);
1779 }
1780
1781
1782 CaptureVoiceOut *AUD_add_capture(
1783     AudioState *s,
1784     struct audsettings *as,
1785     struct audio_capture_ops *ops,
1786     void *cb_opaque
1787     )
1788 {
1789     CaptureVoiceOut *cap;
1790     struct capture_callback *cb;
1791
1792     if (!s) {
1793         if (!legacy_config) {
1794             dolog("Capturing without setting an audiodev is deprecated\n");
1795         }
1796         s = audio_init(NULL, NULL);
1797     }
1798
1799     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1800         dolog("Can't capture with mixeng disabled\n");
1801         return NULL;
1802     }
1803
1804     if (audio_validate_settings (as)) {
1805         dolog ("Invalid settings were passed when trying to add capture\n");
1806         audio_print_settings (as);
1807         return NULL;
1808     }
1809
1810     cb = g_malloc0(sizeof(*cb));
1811     cb->ops = *ops;
1812     cb->opaque = cb_opaque;
1813
1814     cap = audio_pcm_capture_find_specific(s, as);
1815     if (cap) {
1816         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1817         return cap;
1818     }
1819     else {
1820         HWVoiceOut *hw;
1821         CaptureVoiceOut *cap;
1822
1823         cap = g_malloc0(sizeof(*cap));
1824
1825         hw = &cap->hw;
1826         hw->s = s;
1827         QLIST_INIT (&hw->sw_head);
1828         QLIST_INIT (&cap->cb_head);
1829
1830         /* XXX find a more elegant way */
1831         hw->samples = 4096 * 4;
1832         audio_pcm_hw_alloc_resources_out(hw);
1833
1834         audio_pcm_init_info (&hw->info, as);
1835
1836         cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1837
1838         hw->clip = mixeng_clip
1839             [hw->info.nchannels == 2]
1840             [hw->info.sign]
1841             [hw->info.swap_endianness]
1842             [audio_bits_to_index (hw->info.bits)];
1843
1844         QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1845         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1846
1847         QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1848             audio_attach_capture (hw);
1849         }
1850         return cap;
1851     }
1852 }
1853
1854 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1855 {
1856     struct capture_callback *cb;
1857
1858     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1859         if (cb->opaque == cb_opaque) {
1860             cb->ops.destroy (cb_opaque);
1861             QLIST_REMOVE (cb, entries);
1862             g_free (cb);
1863
1864             if (!cap->cb_head.lh_first) {
1865                 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1866
1867                 while (sw) {
1868                     SWVoiceCap *sc = (SWVoiceCap *) sw;
1869 #ifdef DEBUG_CAPTURE
1870                     dolog ("freeing %s\n", sw->name);
1871 #endif
1872
1873                     sw1 = sw->entries.le_next;
1874                     if (sw->rate) {
1875                         st_rate_stop (sw->rate);
1876                         sw->rate = NULL;
1877                     }
1878                     QLIST_REMOVE (sw, entries);
1879                     QLIST_REMOVE (sc, entries);
1880                     g_free (sc);
1881                     sw = sw1;
1882                 }
1883                 QLIST_REMOVE (cap, entries);
1884                 g_free (cap->hw.mix_buf);
1885                 g_free (cap->buf);
1886                 g_free (cap);
1887             }
1888             return;
1889         }
1890     }
1891 }
1892
1893 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1894 {
1895     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1896     audio_set_volume_out(sw, &vol);
1897 }
1898
1899 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1900 {
1901     if (sw) {
1902         HWVoiceOut *hw = sw->hw;
1903
1904         sw->vol.mute = vol->mute;
1905         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1906         sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1907             255;
1908
1909         if (hw->pcm_ops->volume_out) {
1910             hw->pcm_ops->volume_out(hw, vol);
1911         }
1912     }
1913 }
1914
1915 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1916 {
1917     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1918     audio_set_volume_in(sw, &vol);
1919 }
1920
1921 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1922 {
1923     if (sw) {
1924         HWVoiceIn *hw = sw->hw;
1925
1926         sw->vol.mute = vol->mute;
1927         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1928         sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1929             255;
1930
1931         if (hw->pcm_ops->volume_in) {
1932             hw->pcm_ops->volume_in(hw, vol);
1933         }
1934     }
1935 }
1936
1937 void audio_create_pdos(Audiodev *dev)
1938 {
1939     switch (dev->driver) {
1940 #define CASE(DRIVER, driver, pdo_name)                              \
1941     case AUDIODEV_DRIVER_##DRIVER:                                  \
1942         if (!dev->u.driver.has_in) {                                \
1943             dev->u.driver.in = g_malloc0(                           \
1944                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1945             dev->u.driver.has_in = true;                            \
1946         }                                                           \
1947         if (!dev->u.driver.has_out) {                               \
1948             dev->u.driver.out = g_malloc0(                          \
1949                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1950             dev->u.driver.has_out = true;                           \
1951         }                                                           \
1952         break
1953
1954         CASE(NONE, none, );
1955         CASE(ALSA, alsa, Alsa);
1956         CASE(COREAUDIO, coreaudio, Coreaudio);
1957         CASE(DSOUND, dsound, );
1958         CASE(OSS, oss, Oss);
1959         CASE(PA, pa, Pa);
1960         CASE(SDL, sdl, );
1961         CASE(SPICE, spice, );
1962         CASE(WAV, wav, );
1963
1964     case AUDIODEV_DRIVER__MAX:
1965         abort();
1966     };
1967 }
1968
1969 static void audio_validate_per_direction_opts(
1970     AudiodevPerDirectionOptions *pdo, Error **errp)
1971 {
1972     if (!pdo->has_mixing_engine) {
1973         pdo->has_mixing_engine = true;
1974         pdo->mixing_engine = true;
1975     }
1976     if (!pdo->has_fixed_settings) {
1977         pdo->has_fixed_settings = true;
1978         pdo->fixed_settings = pdo->mixing_engine;
1979     }
1980     if (!pdo->fixed_settings &&
1981         (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
1982         error_setg(errp,
1983                    "You can't use frequency, channels or format with fixed-settings=off");
1984         return;
1985     }
1986     if (!pdo->mixing_engine && pdo->fixed_settings) {
1987         error_setg(errp, "You can't use fixed-settings without mixeng");
1988         return;
1989     }
1990
1991     if (!pdo->has_frequency) {
1992         pdo->has_frequency = true;
1993         pdo->frequency = 44100;
1994     }
1995     if (!pdo->has_channels) {
1996         pdo->has_channels = true;
1997         pdo->channels = 2;
1998     }
1999     if (!pdo->has_voices) {
2000         pdo->has_voices = true;
2001         pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2002     }
2003     if (!pdo->has_format) {
2004         pdo->has_format = true;
2005         pdo->format = AUDIO_FORMAT_S16;
2006     }
2007 }
2008
2009 static void audio_validate_opts(Audiodev *dev, Error **errp)
2010 {
2011     Error *err = NULL;
2012
2013     audio_create_pdos(dev);
2014
2015     audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2016     if (err) {
2017         error_propagate(errp, err);
2018         return;
2019     }
2020
2021     audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2022     if (err) {
2023         error_propagate(errp, err);
2024         return;
2025     }
2026
2027     if (!dev->has_timer_period) {
2028         dev->has_timer_period = true;
2029         dev->timer_period = 10000; /* 100Hz -> 10ms */
2030     }
2031 }
2032
2033 void audio_parse_option(const char *opt)
2034 {
2035     AudiodevListEntry *e;
2036     Audiodev *dev = NULL;
2037
2038     Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2039     visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2040     visit_free(v);
2041
2042     audio_validate_opts(dev, &error_fatal);
2043
2044     e = g_malloc0(sizeof(AudiodevListEntry));
2045     e->dev = dev;
2046     QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2047 }
2048
2049 void audio_init_audiodevs(void)
2050 {
2051     AudiodevListEntry *e;
2052
2053     QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2054         audio_init(e->dev, NULL);
2055     }
2056 }
2057
2058 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2059 {
2060     return (audsettings) {
2061         .freq = pdo->frequency,
2062         .nchannels = pdo->channels,
2063         .fmt = pdo->format,
2064         .endianness = AUDIO_HOST_ENDIANNESS,
2065     };
2066 }
2067
2068 int audioformat_bytes_per_sample(AudioFormat fmt)
2069 {
2070     switch (fmt) {
2071     case AUDIO_FORMAT_U8:
2072     case AUDIO_FORMAT_S8:
2073         return 1;
2074
2075     case AUDIO_FORMAT_U16:
2076     case AUDIO_FORMAT_S16:
2077         return 2;
2078
2079     case AUDIO_FORMAT_U32:
2080     case AUDIO_FORMAT_S32:
2081         return 4;
2082
2083     case AUDIO_FORMAT__MAX:
2084         ;
2085     }
2086     abort();
2087 }
2088
2089
2090 /* frames = freq * usec / 1e6 */
2091 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2092                         audsettings *as, int def_usecs)
2093 {
2094     uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2095     return (as->freq * usecs + 500000) / 1000000;
2096 }
2097
2098 /* samples = channels * frames = channels * freq * usec / 1e6 */
2099 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2100                          audsettings *as, int def_usecs)
2101 {
2102     return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2103 }
2104
2105 /*
2106  * bytes = bytes_per_sample * samples =
2107  *     bytes_per_sample * channels * freq * usec / 1e6
2108  */
2109 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2110                        audsettings *as, int def_usecs)
2111 {
2112     return audio_buffer_samples(pdo, as, def_usecs) *
2113         audioformat_bytes_per_sample(as->fmt);
2114 }
2115
2116 AudioState *audio_state_by_name(const char *name)
2117 {
2118     AudioState *s;
2119     QTAILQ_FOREACH(s, &audio_states, list) {
2120         assert(s->dev);
2121         if (strcmp(name, s->dev->id) == 0) {
2122             return s;
2123         }
2124     }
2125     return NULL;
2126 }
2127
2128 const char *audio_get_id(QEMUSoundCard *card)
2129 {
2130     if (card->state) {
2131         assert(card->state->dev);
2132         return card->state->dev->id;
2133     } else {
2134         return "";
2135     }
2136 }
2137
2138 void audio_rate_start(RateCtl *rate)
2139 {
2140     memset(rate, 0, sizeof(RateCtl));
2141     rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2142 }
2143
2144 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2145                             size_t bytes_avail)
2146 {
2147     int64_t now;
2148     int64_t ticks;
2149     int64_t bytes;
2150     int64_t samples;
2151     size_t ret;
2152
2153     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2154     ticks = now - rate->start_ticks;
2155     bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2156     samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2157     if (samples < 0 || samples > 65536) {
2158         AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2159         audio_rate_start(rate);
2160         samples = 0;
2161     }
2162
2163     ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2164     rate->bytes_sent += ret;
2165     return ret;
2166 }