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 "ui/qemu-spice.h"
  38 #include "trace.h"
  39
  40 #define AUDIO_CAP "audio"
  41 #include "audio_int.h"
  42
  43 /* #define DEBUG_LIVE */
  44 /* #define DEBUG_OUT */
  45 /* #define DEBUG_CAPTURE */
  46 /* #define DEBUG_POLL */
  47
  48 #define SW_NAME(sw) (sw)->name ? (sw)->name : "unknown"
  49
  50
  51 /* Order of CONFIG_AUDIO_DRIVERS is import.
  52    The 1st one is the one used by default, that is the reason
  53     that we generate the list.
  54 */
  55 const char *audio_prio_list[] = {
  56     "spice",
  57     CONFIG_AUDIO_DRIVERS
  58     "none",
  59     "wav",
  60     NULL
  61 };
  62
  63 static QLIST_HEAD(, audio_driver) audio_drivers;
  64 static AudiodevListHead audiodevs = QSIMPLEQ_HEAD_INITIALIZER(audiodevs);
  65
  66 void audio_driver_register(audio_driver *drv)
  67 {
  68     QLIST_INSERT_HEAD(&audio_drivers, drv, next);
  69 }
  70
  71 audio_driver *audio_driver_lookup(const char *name)
  72 {
  73     struct audio_driver *d;
  74
  75     QLIST_FOREACH(d, &audio_drivers, next) {
  76         if (strcmp(name, d->name) == 0) {
  77             return d;
  78         }
  79     }
  80
  81     audio_module_load_one(name);
  82     QLIST_FOREACH(d, &audio_drivers, next) {
  83         if (strcmp(name, d->name) == 0) {
  84             return d;
  85         }
  86     }
  87
  88     return NULL;
  89 }
  90
  91 static QTAILQ_HEAD(AudioStateHead, AudioState) audio_states =
  92     QTAILQ_HEAD_INITIALIZER(audio_states);
  93
  94 const struct mixeng_volume nominal_volume = {
  95     .mute = 0,
  96 #ifdef FLOAT_MIXENG
  97     .r = 1.0,
  98     .l = 1.0,
  99 #else
 100     .r = 1ULL << 32,
 101     .l = 1ULL << 32,
 102 #endif
 103 };
 104
 105 static bool legacy_config = true;
 106
 107 int audio_bug (const char *funcname, int cond)
 108 {
 109     if (cond) {
 110         static int shown;
 111
 112         AUD_log (NULL, "A bug was just triggered in %s\n", funcname);
 113         if (!shown) {
 114             shown = 1;
 115             AUD_log (NULL, "Save all your work and restart without audio\n");
 116             AUD_log (NULL, "I am sorry\n");
 117         }
 118         AUD_log (NULL, "Context:\n");
 119         abort();
 120     }
 121
 122     return cond;
 123 }
 124
 125 static inline int audio_bits_to_index (int bits)
 126 {
 127     switch (bits) {
 128     case 8:
 129         return 0;
 130
 131     case 16:
 132         return 1;
 133
 134     case 32:
 135         return 2;
 136
 137     default:
 138         audio_bug ("bits_to_index", 1);
 139         AUD_log (NULL, "invalid bits %d\n", bits);
 140         return 0;
 141     }
 142 }
 143
 144 void *audio_calloc (const char *funcname, int nmemb, size_t size)
 145 {
 146     int cond;
 147     size_t len;
 148
 149     len = nmemb * size;
 150     cond = !nmemb || !size;
 151     cond |= nmemb < 0;
 152     cond |= len < size;
 153
 154     if (audio_bug ("audio_calloc", cond)) {
 155         AUD_log (NULL, "%s passed invalid arguments to audio_calloc\n",
 156                  funcname);
 157         AUD_log (NULL, "nmemb=%d size=%zu (len=%zu)\n", nmemb, size, len);
 158         return NULL;
 159     }
 160
 161     return g_malloc0 (len);
 162 }
 163
 164 void AUD_vlog (const char *cap, const char *fmt, va_list ap)
 165 {
 166     if (cap) {
 167         fprintf(stderr, "%s: ", cap);
 168     }
 169
 170     vfprintf(stderr, fmt, ap);
 171 }
 172
 173 void AUD_log (const char *cap, const char *fmt, ...)
 174 {
 175     va_list ap;
 176
 177     va_start (ap, fmt);
 178     AUD_vlog (cap, fmt, ap);
 179     va_end (ap);
 180 }
 181
 182 static void audio_print_settings (struct audsettings *as)
 183 {
 184     dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels);
 185
 186     switch (as->fmt) {
 187     case AUDIO_FORMAT_S8:
 188         AUD_log (NULL, "S8");
 189         break;
 190     case AUDIO_FORMAT_U8:
 191         AUD_log (NULL, "U8");
 192         break;
 193     case AUDIO_FORMAT_S16:
 194         AUD_log (NULL, "S16");
 195         break;
 196     case AUDIO_FORMAT_U16:
 197         AUD_log (NULL, "U16");
 198         break;
 199     case AUDIO_FORMAT_S32:
 200         AUD_log (NULL, "S32");
 201         break;
 202     case AUDIO_FORMAT_U32:
 203         AUD_log (NULL, "U32");
 204         break;
 205     case AUDIO_FORMAT_F32:
 206         AUD_log (NULL, "F32");
 207         break;
 208     default:
 209         AUD_log (NULL, "invalid(%d)", as->fmt);
 210         break;
 211     }
 212
 213     AUD_log (NULL, " endianness=");
 214     switch (as->endianness) {
 215     case 0:
 216         AUD_log (NULL, "little");
 217         break;
 218     case 1:
 219         AUD_log (NULL, "big");
 220         break;
 221     default:
 222         AUD_log (NULL, "invalid");
 223         break;
 224     }
 225     AUD_log (NULL, "\n");
 226 }
 227
 228 static int audio_validate_settings (struct audsettings *as)
 229 {
 230     int invalid;
 231
 232     invalid = as->nchannels < 1;
 233     invalid |= as->endianness != 0 && as->endianness != 1;
 234
 235     switch (as->fmt) {
 236     case AUDIO_FORMAT_S8:
 237     case AUDIO_FORMAT_U8:
 238     case AUDIO_FORMAT_S16:
 239     case AUDIO_FORMAT_U16:
 240     case AUDIO_FORMAT_S32:
 241     case AUDIO_FORMAT_U32:
 242     case AUDIO_FORMAT_F32:
 243         break;
 244     default:
 245         invalid = 1;
 246         break;
 247     }
 248
 249     invalid |= as->freq <= 0;
 250     return invalid ? -1 : 0;
 251 }
 252
 253 static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as)
 254 {
 255     int bits = 8;
 256     bool is_signed = false, is_float = false;
 257
 258     switch (as->fmt) {
 259     case AUDIO_FORMAT_S8:
 260         is_signed = true;
 261         /* fall through */
 262     case AUDIO_FORMAT_U8:
 263         break;
 264
 265     case AUDIO_FORMAT_S16:
 266         is_signed = true;
 267         /* fall through */
 268     case AUDIO_FORMAT_U16:
 269         bits = 16;
 270         break;
 271
 272     case AUDIO_FORMAT_F32:
 273         is_float = true;
 274         /* fall through */
 275     case AUDIO_FORMAT_S32:
 276         is_signed = true;
 277         /* fall through */
 278     case AUDIO_FORMAT_U32:
 279         bits = 32;
 280         break;
 281
 282     default:
 283         abort();
 284     }
 285     return info->freq == as->freq
 286         && info->nchannels == as->nchannels
 287         && info->is_signed == is_signed
 288         && info->is_float == is_float
 289         && info->bits == bits
 290         && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS);
 291 }
 292
 293 void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as)
 294 {
 295     int bits = 8, mul;
 296     bool is_signed = false, is_float = false;
 297
 298     switch (as->fmt) {
 299     case AUDIO_FORMAT_S8:
 300         is_signed = true;
 301         /* fall through */
 302     case AUDIO_FORMAT_U8:
 303         mul = 1;
 304         break;
 305
 306     case AUDIO_FORMAT_S16:
 307         is_signed = true;
 308         /* fall through */
 309     case AUDIO_FORMAT_U16:
 310         bits = 16;
 311         mul = 2;
 312         break;
 313
 314     case AUDIO_FORMAT_F32:
 315         is_float = true;
 316         /* fall through */
 317     case AUDIO_FORMAT_S32:
 318         is_signed = true;
 319         /* fall through */
 320     case AUDIO_FORMAT_U32:
 321         bits = 32;
 322         mul = 4;
 323         break;
 324
 325     default:
 326         abort();
 327     }
 328
 329     info->freq = as->freq;
 330     info->bits = bits;
 331     info->is_signed = is_signed;
 332     info->is_float = is_float;
 333     info->nchannels = as->nchannels;
 334     info->bytes_per_frame = as->nchannels * mul;
 335     info->bytes_per_second = info->freq * info->bytes_per_frame;
 336     info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS);
 337 }
 338
 339 void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len)
 340 {
 341     if (!len) {
 342         return;
 343     }
 344
 345     if (info->is_signed || info->is_float) {
 346         memset(buf, 0x00, len * info->bytes_per_frame);
 347     } else {
 348         switch (info->bits) {
 349         case 8:
 350             memset(buf, 0x80, len * info->bytes_per_frame);
 351             break;
 352
 353         case 16:
 354             {
 355                 int i;
 356                 uint16_t *p = buf;
 357                 short s = INT16_MAX;
 358
 359                 if (info->swap_endianness) {
 360                     s = bswap16 (s);
 361                 }
 362
 363                 for (i = 0; i < len * info->nchannels; i++) {
 364                     p[i] = s;
 365                 }
 366             }
 367             break;
 368
 369         case 32:
 370             {
 371                 int i;
 372                 uint32_t *p = buf;
 373                 int32_t s = INT32_MAX;
 374
 375                 if (info->swap_endianness) {
 376                     s = bswap32 (s);
 377                 }
 378
 379                 for (i = 0; i < len * info->nchannels; i++) {
 380                     p[i] = s;
 381                 }
 382             }
 383             break;
 384
 385         default:
 386             AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n",
 387                      info->bits);
 388             break;
 389         }
 390     }
 391 }
 392
 393 /*
 394  * Capture
 395  */
 396 static void noop_conv (struct st_sample *dst, const void *src, int samples)
 397 {
 398     (void) src;
 399     (void) dst;
 400     (void) samples;
 401 }
 402
 403 static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
 404                                                         struct audsettings *as)
 405 {
 406     CaptureVoiceOut *cap;
 407
 408     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 409         if (audio_pcm_info_eq (&cap->hw.info, as)) {
 410             return cap;
 411         }
 412     }
 413     return NULL;
 414 }
 415
 416 static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd)
 417 {
 418     struct capture_callback *cb;
 419
 420 #ifdef DEBUG_CAPTURE
 421     dolog ("notification %d sent\n", cmd);
 422 #endif
 423     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
 424         cb->ops.notify (cb->opaque, cmd);
 425     }
 426 }
 427
 428 static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled)
 429 {
 430     if (cap->hw.enabled != enabled) {
 431         audcnotification_e cmd;
 432         cap->hw.enabled = enabled;
 433         cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE;
 434         audio_notify_capture (cap, cmd);
 435     }
 436 }
 437
 438 static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap)
 439 {
 440     HWVoiceOut *hw = &cap->hw;
 441     SWVoiceOut *sw;
 442     int enabled = 0;
 443
 444     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 445         if (sw->active) {
 446             enabled = 1;
 447             break;
 448         }
 449     }
 450     audio_capture_maybe_changed (cap, enabled);
 451 }
 452
 453 static void audio_detach_capture (HWVoiceOut *hw)
 454 {
 455     SWVoiceCap *sc = hw->cap_head.lh_first;
 456
 457     while (sc) {
 458         SWVoiceCap *sc1 = sc->entries.le_next;
 459         SWVoiceOut *sw = &sc->sw;
 460         CaptureVoiceOut *cap = sc->cap;
 461         int was_active = sw->active;
 462
 463         if (sw->rate) {
 464             st_rate_stop (sw->rate);
 465             sw->rate = NULL;
 466         }
 467
 468         QLIST_REMOVE (sw, entries);
 469         QLIST_REMOVE (sc, entries);
 470         g_free (sc);
 471         if (was_active) {
 472             /* We have removed soft voice from the capture:
 473                this might have changed the overall status of the capture
 474                since this might have been the only active voice */
 475             audio_recalc_and_notify_capture (cap);
 476         }
 477         sc = sc1;
 478     }
 479 }
 480
 481 static int audio_attach_capture (HWVoiceOut *hw)
 482 {
 483     AudioState *s = hw->s;
 484     CaptureVoiceOut *cap;
 485
 486     audio_detach_capture (hw);
 487     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 488         SWVoiceCap *sc;
 489         SWVoiceOut *sw;
 490         HWVoiceOut *hw_cap = &cap->hw;
 491
 492         sc = g_malloc0(sizeof(*sc));
 493
 494         sc->cap = cap;
 495         sw = &sc->sw;
 496         sw->hw = hw_cap;
 497         sw->info = hw->info;
 498         sw->empty = 1;
 499         sw->active = hw->enabled;
 500         sw->conv = noop_conv;
 501         sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
 502         sw->vol = nominal_volume;
 503         sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
 504         if (!sw->rate) {
 505             dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw));
 506             g_free (sw);
 507             return -1;
 508         }
 509         QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
 510         QLIST_INSERT_HEAD (&hw->cap_head, sc, entries);
 511 #ifdef DEBUG_CAPTURE
 512         sw->name = g_strdup_printf ("for %p %d,%d,%d",
 513                                     hw, sw->info.freq, sw->info.bits,
 514                                     sw->info.nchannels);
 515         dolog ("Added %s active = %d\n", sw->name, sw->active);
 516 #endif
 517         if (sw->active) {
 518             audio_capture_maybe_changed (cap, 1);
 519         }
 520     }
 521     return 0;
 522 }
 523
 524 /*
 525  * Hard voice (capture)
 526  */
 527 static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 528 {
 529     SWVoiceIn *sw;
 530     size_t m = hw->total_samples_captured;
 531
 532     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 533         if (sw->active) {
 534             m = MIN (m, sw->total_hw_samples_acquired);
 535         }
 536     }
 537     return m;
 538 }
 539
 540 static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw)
 541 {
 542     size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 543     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 544         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 545         return 0;
 546     }
 547     return live;
 548 }
 549
 550 static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 551 {
 552     size_t clipped = 0;
 553     size_t pos = hw->mix_buf->pos;
 554
 555     while (len) {
 556         st_sample *src = hw->mix_buf->samples + pos;
 557         uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
 558         size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
 559         size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 560
 561         hw->clip(dst, src, samples_to_clip);
 562
 563         pos = (pos + samples_to_clip) % hw->mix_buf->size;
 564         len -= samples_to_clip;
 565         clipped += samples_to_clip;
 566     }
 567 }
 568
 569 /*
 570  * Soft voice (capture)
 571  */
 572 static size_t audio_pcm_sw_get_rpos_in(SWVoiceIn *sw)
 573 {
 574     HWVoiceIn *hw = sw->hw;
 575     ssize_t live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 576     ssize_t rpos;
 577
 578     if (audio_bug(__func__, live < 0 || live > hw->conv_buf->size)) {
 579         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 580         return 0;
 581     }
 582
 583     rpos = hw->conv_buf->pos - live;
 584     if (rpos >= 0) {
 585         return rpos;
 586     } else {
 587         return hw->conv_buf->size + rpos;
 588     }
 589 }
 590
 591 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 592 {
 593     HWVoiceIn *hw = sw->hw;
 594     size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 595     struct st_sample *src, *dst = sw->buf;
 596
 597     rpos = audio_pcm_sw_get_rpos_in(sw) % hw->conv_buf->size;
 598
 599     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 600     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 601         dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 602         return 0;
 603     }
 604
 605     samples = size / sw->info.bytes_per_frame;
 606     if (!live) {
 607         return 0;
 608     }
 609
 610     swlim = (live * sw->ratio) >> 32;
 611     swlim = MIN (swlim, samples);
 612
 613     while (swlim) {
 614         src = hw->conv_buf->samples + rpos;
 615         if (hw->conv_buf->pos > rpos) {
 616             isamp = hw->conv_buf->pos - rpos;
 617         } else {
 618             isamp = hw->conv_buf->size - rpos;
 619         }
 620
 621         if (!isamp) {
 622             break;
 623         }
 624         osamp = swlim;
 625
 626         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 627         swlim -= osamp;
 628         rpos = (rpos + isamp) % hw->conv_buf->size;
 629         dst += osamp;
 630         ret += osamp;
 631         total += isamp;
 632     }
 633
 634     if (hw->pcm_ops && !hw->pcm_ops->volume_in) {
 635         mixeng_volume (sw->buf, ret, &sw->vol);
 636     }
 637
 638     sw->clip (buf, sw->buf, ret);
 639     sw->total_hw_samples_acquired += total;
 640     return ret * sw->info.bytes_per_frame;
 641 }
 642
 643 /*
 644  * Hard voice (playback)
 645  */
 646 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 647 {
 648     SWVoiceOut *sw;
 649     size_t m = SIZE_MAX;
 650     int nb_live = 0;
 651
 652     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 653         if (sw->active || !sw->empty) {
 654             m = MIN (m, sw->total_hw_samples_mixed);
 655             nb_live += 1;
 656         }
 657     }
 658
 659     *nb_livep = nb_live;
 660     return m;
 661 }
 662
 663 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 664 {
 665     size_t smin;
 666     int nb_live1;
 667
 668     smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 669     if (nb_live) {
 670         *nb_live = nb_live1;
 671     }
 672
 673     if (nb_live1) {
 674         size_t live = smin;
 675
 676         if (audio_bug(__func__, live > hw->mix_buf->size)) {
 677             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 678             return 0;
 679         }
 680         return live;
 681     }
 682     return 0;
 683 }
 684
 685 /*
 686  * Soft voice (playback)
 687  */
 688 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 689 {
 690     size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 691     size_t ret = 0, pos = 0, total = 0;
 692
 693     if (!sw) {
 694         return size;
 695     }
 696
 697     hwsamples = sw->hw->mix_buf->size;
 698
 699     live = sw->total_hw_samples_mixed;
 700     if (audio_bug(__func__, live > hwsamples)) {
 701         dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 702         return 0;
 703     }
 704
 705     if (live == hwsamples) {
 706 #ifdef DEBUG_OUT
 707         dolog ("%s is full %d\n", sw->name, live);
 708 #endif
 709         return 0;
 710     }
 711
 712     wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 713     samples = size / sw->info.bytes_per_frame;
 714
 715     dead = hwsamples - live;
 716     swlim = ((int64_t) dead << 32) / sw->ratio;
 717     swlim = MIN (swlim, samples);
 718     if (swlim) {
 719         sw->conv (sw->buf, buf, swlim);
 720
 721         if (sw->hw->pcm_ops && !sw->hw->pcm_ops->volume_out) {
 722             mixeng_volume (sw->buf, swlim, &sw->vol);
 723         }
 724     }
 725
 726     while (swlim) {
 727         dead = hwsamples - live;
 728         left = hwsamples - wpos;
 729         blck = MIN (dead, left);
 730         if (!blck) {
 731             break;
 732         }
 733         isamp = swlim;
 734         osamp = blck;
 735         st_rate_flow_mix (
 736             sw->rate,
 737             sw->buf + pos,
 738             sw->hw->mix_buf->samples + wpos,
 739             &isamp,
 740             &osamp
 741             );
 742         ret += isamp;
 743         swlim -= isamp;
 744         pos += isamp;
 745         live += osamp;
 746         wpos = (wpos + osamp) % hwsamples;
 747         total += osamp;
 748     }
 749
 750     sw->total_hw_samples_mixed += total;
 751     sw->empty = sw->total_hw_samples_mixed == 0;
 752
 753 #ifdef DEBUG_OUT
 754     dolog (
 755         "%s: write size %zu ret %zu total sw %zu\n",
 756         SW_NAME (sw),
 757         size / sw->info.bytes_per_frame,
 758         ret,
 759         sw->total_hw_samples_mixed
 760         );
 761 #endif
 762
 763     return ret * sw->info.bytes_per_frame;
 764 }
 765
 766 #ifdef DEBUG_AUDIO
 767 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 768 {
 769     dolog("%s: bits %d, sign %d, float %d, freq %d, nchan %d\n",
 770           cap, info->bits, info->is_signed, info->is_float, info->freq,
 771           info->nchannels);
 772 }
 773 #endif
 774
 775 #define DAC
 776 #include "audio_template.h"
 777 #undef DAC
 778 #include "audio_template.h"
 779
 780 /*
 781  * Timer
 782  */
 783 static int audio_is_timer_needed(AudioState *s)
 784 {
 785     HWVoiceIn *hwi = NULL;
 786     HWVoiceOut *hwo = NULL;
 787
 788     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
 789         if (!hwo->poll_mode) {
 790             return 1;
 791         }
 792     }
 793     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
 794         if (!hwi->poll_mode) {
 795             return 1;
 796         }
 797     }
 798     return 0;
 799 }
 800
 801 static void audio_reset_timer (AudioState *s)
 802 {
 803     if (audio_is_timer_needed(s)) {
 804         timer_mod_anticipate_ns(s->ts,
 805             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
 806         if (!s->timer_running) {
 807             s->timer_running = true;
 808             s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 809             trace_audio_timer_start(s->period_ticks / SCALE_MS);
 810         }
 811     } else {
 812         timer_del(s->ts);
 813         if (s->timer_running) {
 814             s->timer_running = false;
 815             trace_audio_timer_stop();
 816         }
 817     }
 818 }
 819
 820 static void audio_timer (void *opaque)
 821 {
 822     int64_t now, diff;
 823     AudioState *s = opaque;
 824
 825     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 826     diff = now - s->timer_last;
 827     if (diff > s->period_ticks * 3 / 2) {
 828         trace_audio_timer_delayed(diff / SCALE_MS);
 829     }
 830     s->timer_last = now;
 831
 832     audio_run(s, "timer");
 833     audio_reset_timer(s);
 834 }
 835
 836 /*
 837  * Public API
 838  */
 839 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size)
 840 {
 841     HWVoiceOut *hw;
 842
 843     if (!sw) {
 844         /* XXX: Consider options */
 845         return size;
 846     }
 847     hw = sw->hw;
 848
 849     if (!hw->enabled) {
 850         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 851         return 0;
 852     }
 853
 854     if (audio_get_pdo_out(hw->s->dev)->mixing_engine) {
 855         return audio_pcm_sw_write(sw, buf, size);
 856     } else {
 857         return hw->pcm_ops->write(hw, buf, size);
 858     }
 859 }
 860
 861 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size)
 862 {
 863     HWVoiceIn *hw;
 864
 865     if (!sw) {
 866         /* XXX: Consider options */
 867         return size;
 868     }
 869     hw = sw->hw;
 870
 871     if (!hw->enabled) {
 872         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 873         return 0;
 874     }
 875
 876     if (audio_get_pdo_in(hw->s->dev)->mixing_engine) {
 877         return audio_pcm_sw_read(sw, buf, size);
 878     } else {
 879         return hw->pcm_ops->read(hw, buf, size);
 880     }
 881 }
 882
 883 int AUD_get_buffer_size_out(SWVoiceOut *sw)
 884 {
 885     return sw->hw->samples * sw->hw->info.bytes_per_frame;
 886 }
 887
 888 void AUD_set_active_out (SWVoiceOut *sw, int on)
 889 {
 890     HWVoiceOut *hw;
 891
 892     if (!sw) {
 893         return;
 894     }
 895
 896     hw = sw->hw;
 897     if (sw->active != on) {
 898         AudioState *s = sw->s;
 899         SWVoiceOut *temp_sw;
 900         SWVoiceCap *sc;
 901
 902         if (on) {
 903             hw->pending_disable = 0;
 904             if (!hw->enabled) {
 905                 hw->enabled = 1;
 906                 if (s->vm_running) {
 907                     if (hw->pcm_ops->enable_out) {
 908                         hw->pcm_ops->enable_out(hw, true);
 909                     }
 910                     audio_reset_timer (s);
 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         } 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 = live * hw->info.bytes_per_frame;
1077         size_t decr, proc;
1078         void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
1079
1080         if (size == 0) {
1081             break;
1082         }
1083
1084         decr = MIN(size / hw->info.bytes_per_frame, live);
1085         if (buf) {
1086             audio_pcm_hw_clip_out(hw, buf, decr);
1087         }
1088         proc = hw->pcm_ops->put_buffer_out(hw, buf,
1089                                            decr * hw->info.bytes_per_frame) /
1090             hw->info.bytes_per_frame;
1091
1092         live -= proc;
1093         clipped += proc;
1094         hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size;
1095
1096         if (proc == 0 || proc < decr) {
1097             break;
1098         }
1099     }
1100
1101     if (hw->pcm_ops->run_buffer_out) {
1102         hw->pcm_ops->run_buffer_out(hw);
1103     }
1104
1105     return clipped;
1106 }
1107
1108 static void audio_run_out (AudioState *s)
1109 {
1110     HWVoiceOut *hw = NULL;
1111     SWVoiceOut *sw;
1112
1113     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1114         while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1115             /* there is exactly 1 sw for each hw with no mixeng */
1116             sw = hw->sw_head.lh_first;
1117
1118             if (hw->pending_disable) {
1119                 hw->enabled = 0;
1120                 hw->pending_disable = 0;
1121                 if (hw->pcm_ops->enable_out) {
1122                     hw->pcm_ops->enable_out(hw, false);
1123                 }
1124             }
1125
1126             if (sw->active) {
1127                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1128             }
1129         }
1130         return;
1131     }
1132
1133     while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1134         size_t played, live, prev_rpos, free;
1135         int nb_live;
1136
1137         live = audio_pcm_hw_get_live_out (hw, &nb_live);
1138         if (!nb_live) {
1139             live = 0;
1140         }
1141
1142         if (audio_bug(__func__, live > hw->mix_buf->size)) {
1143             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
1144             continue;
1145         }
1146
1147         if (hw->pending_disable && !nb_live) {
1148             SWVoiceCap *sc;
1149 #ifdef DEBUG_OUT
1150             dolog ("Disabling voice\n");
1151 #endif
1152             hw->enabled = 0;
1153             hw->pending_disable = 0;
1154             if (hw->pcm_ops->enable_out) {
1155                 hw->pcm_ops->enable_out(hw, false);
1156             }
1157             for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1158                 sc->sw.active = 0;
1159                 audio_recalc_and_notify_capture (sc->cap);
1160             }
1161             continue;
1162         }
1163
1164         if (!live) {
1165             for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1166                 if (sw->active) {
1167                     free = audio_get_free (sw);
1168                     if (free > 0) {
1169                         sw->callback.fn (sw->callback.opaque, free);
1170                     }
1171                 }
1172             }
1173             if (hw->pcm_ops->run_buffer_out) {
1174                 hw->pcm_ops->run_buffer_out(hw);
1175             }
1176             continue;
1177         }
1178
1179         prev_rpos = hw->mix_buf->pos;
1180         played = audio_pcm_hw_run_out(hw, live);
1181         replay_audio_out(&played);
1182         if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) {
1183             dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n",
1184                   hw->mix_buf->pos, hw->mix_buf->size, played);
1185             hw->mix_buf->pos = 0;
1186         }
1187
1188 #ifdef DEBUG_OUT
1189         dolog("played=%zu\n", played);
1190 #endif
1191
1192         if (played) {
1193             hw->ts_helper += played;
1194             audio_capture_mix_and_clear (hw, prev_rpos, played);
1195         }
1196
1197         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1198             if (!sw->active && sw->empty) {
1199                 continue;
1200             }
1201
1202             if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) {
1203                 dolog("played=%zu sw->total_hw_samples_mixed=%zu\n",
1204                       played, sw->total_hw_samples_mixed);
1205                 played = sw->total_hw_samples_mixed;
1206             }
1207
1208             sw->total_hw_samples_mixed -= played;
1209
1210             if (!sw->total_hw_samples_mixed) {
1211                 sw->empty = 1;
1212             }
1213
1214             if (sw->active) {
1215                 free = audio_get_free (sw);
1216                 if (free > 0) {
1217                     sw->callback.fn (sw->callback.opaque, free);
1218                 }
1219             }
1220         }
1221     }
1222 }
1223
1224 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1225 {
1226     size_t conv = 0;
1227     STSampleBuffer *conv_buf = hw->conv_buf;
1228
1229     if (hw->pcm_ops->run_buffer_in) {
1230         hw->pcm_ops->run_buffer_in(hw);
1231     }
1232
1233     while (samples) {
1234         size_t proc;
1235         size_t size = samples * hw->info.bytes_per_frame;
1236         void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1237
1238         assert(size % hw->info.bytes_per_frame == 0);
1239         if (size == 0) {
1240             break;
1241         }
1242
1243         proc = MIN(size / hw->info.bytes_per_frame,
1244                    conv_buf->size - conv_buf->pos);
1245
1246         hw->conv(conv_buf->samples + conv_buf->pos, buf, proc);
1247         conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
1248
1249         samples -= proc;
1250         conv += proc;
1251         hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1252     }
1253
1254     return conv;
1255 }
1256
1257 static void audio_run_in (AudioState *s)
1258 {
1259     HWVoiceIn *hw = NULL;
1260
1261     if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1262         while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1263             /* there is exactly 1 sw for each hw with no mixeng */
1264             SWVoiceIn *sw = hw->sw_head.lh_first;
1265             if (sw->active) {
1266                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1267             }
1268         }
1269         return;
1270     }
1271
1272     while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1273         SWVoiceIn *sw;
1274         size_t captured = 0, min;
1275
1276         if (replay_mode != REPLAY_MODE_PLAY) {
1277             captured = audio_pcm_hw_run_in(
1278                 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1279         }
1280         replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1281                         hw->conv_buf->size);
1282
1283         min = audio_pcm_hw_find_min_in (hw);
1284         hw->total_samples_captured += captured - min;
1285         hw->ts_helper += captured;
1286
1287         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1288             sw->total_hw_samples_acquired -= min;
1289
1290             if (sw->active) {
1291                 size_t avail;
1292
1293                 avail = audio_get_avail (sw);
1294                 if (avail > 0) {
1295                     sw->callback.fn (sw->callback.opaque, avail);
1296                 }
1297             }
1298         }
1299     }
1300 }
1301
1302 static void audio_run_capture (AudioState *s)
1303 {
1304     CaptureVoiceOut *cap;
1305
1306     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1307         size_t live, rpos, captured;
1308         HWVoiceOut *hw = &cap->hw;
1309         SWVoiceOut *sw;
1310
1311         captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1312         rpos = hw->mix_buf->pos;
1313         while (live) {
1314             size_t left = hw->mix_buf->size - rpos;
1315             size_t to_capture = MIN(live, left);
1316             struct st_sample *src;
1317             struct capture_callback *cb;
1318
1319             src = hw->mix_buf->samples + rpos;
1320             hw->clip (cap->buf, src, to_capture);
1321             mixeng_clear (src, to_capture);
1322
1323             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1324                 cb->ops.capture (cb->opaque, cap->buf,
1325                                  to_capture * hw->info.bytes_per_frame);
1326             }
1327             rpos = (rpos + to_capture) % hw->mix_buf->size;
1328             live -= to_capture;
1329         }
1330         hw->mix_buf->pos = rpos;
1331
1332         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1333             if (!sw->active && sw->empty) {
1334                 continue;
1335             }
1336
1337             if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1338                 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1339                       captured, sw->total_hw_samples_mixed);
1340                 captured = sw->total_hw_samples_mixed;
1341             }
1342
1343             sw->total_hw_samples_mixed -= captured;
1344             sw->empty = sw->total_hw_samples_mixed == 0;
1345         }
1346     }
1347 }
1348
1349 void audio_run(AudioState *s, const char *msg)
1350 {
1351     audio_run_out(s);
1352     audio_run_in(s);
1353     audio_run_capture(s);
1354
1355 #ifdef DEBUG_POLL
1356     {
1357         static double prevtime;
1358         double currtime;
1359         struct timeval tv;
1360
1361         if (gettimeofday (&tv, NULL)) {
1362             perror ("audio_run: gettimeofday");
1363             return;
1364         }
1365
1366         currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1367         dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1368         prevtime = currtime;
1369     }
1370 #endif
1371 }
1372
1373 void audio_generic_run_buffer_in(HWVoiceIn *hw)
1374 {
1375     if (unlikely(!hw->buf_emul)) {
1376         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
1377         hw->buf_emul = g_malloc(hw->size_emul);
1378         hw->pos_emul = hw->pending_emul = 0;
1379     }
1380
1381     while (hw->pending_emul < hw->size_emul) {
1382         size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1383                               hw->size_emul - hw->pending_emul);
1384         size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1385                                         read_len);
1386         hw->pending_emul += read;
1387         hw->pos_emul = (hw->pos_emul + read) % hw->size_emul;
1388         if (read < read_len) {
1389             break;
1390         }
1391     }
1392 }
1393
1394 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1395 {
1396     ssize_t start = (ssize_t)hw->pos_emul - hw->pending_emul;
1397
1398     if (start < 0) {
1399         start += hw->size_emul;
1400     }
1401     assert(start >= 0 && start < hw->size_emul);
1402
1403     *size = MIN(*size, hw->pending_emul);
1404     *size = MIN(*size, 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_run_buffer_out(HWVoiceOut *hw)
1415 {
1416     while (hw->pending_emul) {
1417         size_t write_len, written;
1418         ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1419
1420         if (start < 0) {
1421             start += hw->size_emul;
1422         }
1423         assert(start >= 0 && start < hw->size_emul);
1424
1425         write_len = MIN(hw->pending_emul, hw->size_emul - start);
1426
1427         written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1428         hw->pending_emul -= written;
1429
1430         if (written < write_len) {
1431             break;
1432         }
1433     }
1434 }
1435
1436 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1437 {
1438     if (unlikely(!hw->buf_emul)) {
1439         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
1440         hw->buf_emul = g_malloc(hw->size_emul);
1441         hw->pos_emul = hw->pending_emul = 0;
1442     }
1443
1444     *size = MIN(hw->size_emul - hw->pending_emul,
1445                 hw->size_emul - hw->pos_emul);
1446     return hw->buf_emul + hw->pos_emul;
1447 }
1448
1449 size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
1450 {
1451     assert(buf == hw->buf_emul + hw->pos_emul &&
1452            size + hw->pending_emul <= hw->size_emul);
1453
1454     hw->pending_emul += size;
1455     hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
1456
1457     return size;
1458 }
1459
1460 size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size)
1461 {
1462     size_t total = 0;
1463
1464     while (total < size) {
1465         size_t dst_size = size - total;
1466         size_t copy_size, proc;
1467         void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1468
1469         if (dst_size == 0) {
1470             break;
1471         }
1472
1473         copy_size = MIN(size - total, dst_size);
1474         if (dst) {
1475             memcpy(dst, (char *)buf + total, copy_size);
1476         }
1477         proc = hw->pcm_ops->put_buffer_out(hw, dst, copy_size);
1478         total += proc;
1479
1480         if (proc == 0 || proc < copy_size) {
1481             break;
1482         }
1483     }
1484
1485     if (hw->pcm_ops->run_buffer_out) {
1486         hw->pcm_ops->run_buffer_out(hw);
1487     }
1488
1489     return total;
1490 }
1491
1492 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1493 {
1494     size_t total = 0;
1495
1496     if (hw->pcm_ops->run_buffer_in) {
1497         hw->pcm_ops->run_buffer_in(hw);
1498     }
1499
1500     while (total < size) {
1501         size_t src_size = size - total;
1502         void *src = hw->pcm_ops->get_buffer_in(hw, &src_size);
1503
1504         if (src_size == 0) {
1505             break;
1506         }
1507
1508         memcpy((char *)buf + total, src, src_size);
1509         hw->pcm_ops->put_buffer_in(hw, src, src_size);
1510         total += src_size;
1511     }
1512
1513     return total;
1514 }
1515
1516 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1517                              bool msg, Audiodev *dev)
1518 {
1519     s->drv_opaque = drv->init(dev);
1520
1521     if (s->drv_opaque) {
1522         if (!drv->pcm_ops->get_buffer_in) {
1523             drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1524             drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1525         }
1526         if (!drv->pcm_ops->get_buffer_out) {
1527             drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1528             drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1529         }
1530
1531         audio_init_nb_voices_out(s, drv);
1532         audio_init_nb_voices_in(s, drv);
1533         s->drv = drv;
1534         return 0;
1535     } else {
1536         if (msg) {
1537             dolog("Could not init `%s' audio driver\n", drv->name);
1538         }
1539         return -1;
1540     }
1541 }
1542
1543 static void audio_vm_change_state_handler (void *opaque, int running,
1544                                            RunState state)
1545 {
1546     AudioState *s = opaque;
1547     HWVoiceOut *hwo = NULL;
1548     HWVoiceIn *hwi = NULL;
1549
1550     s->vm_running = running;
1551     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1552         if (hwo->pcm_ops->enable_out) {
1553             hwo->pcm_ops->enable_out(hwo, running);
1554         }
1555     }
1556
1557     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1558         if (hwi->pcm_ops->enable_in) {
1559             hwi->pcm_ops->enable_in(hwi, running);
1560         }
1561     }
1562     audio_reset_timer (s);
1563 }
1564
1565 static void free_audio_state(AudioState *s)
1566 {
1567     HWVoiceOut *hwo, *hwon;
1568     HWVoiceIn *hwi, *hwin;
1569
1570     QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1571         SWVoiceCap *sc;
1572
1573         if (hwo->enabled && hwo->pcm_ops->enable_out) {
1574             hwo->pcm_ops->enable_out(hwo, false);
1575         }
1576         hwo->pcm_ops->fini_out (hwo);
1577
1578         for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1579             CaptureVoiceOut *cap = sc->cap;
1580             struct capture_callback *cb;
1581
1582             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1583                 cb->ops.destroy (cb->opaque);
1584             }
1585         }
1586         QLIST_REMOVE(hwo, entries);
1587     }
1588
1589     QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1590         if (hwi->enabled && hwi->pcm_ops->enable_in) {
1591             hwi->pcm_ops->enable_in(hwi, false);
1592         }
1593         hwi->pcm_ops->fini_in (hwi);
1594         QLIST_REMOVE(hwi, entries);
1595     }
1596
1597     if (s->drv) {
1598         s->drv->fini (s->drv_opaque);
1599         s->drv = NULL;
1600     }
1601
1602     if (s->dev) {
1603         qapi_free_Audiodev(s->dev);
1604         s->dev = NULL;
1605     }
1606
1607     if (s->ts) {
1608         timer_free(s->ts);
1609         s->ts = NULL;
1610     }
1611
1612     g_free(s);
1613 }
1614
1615 void audio_cleanup(void)
1616 {
1617     while (!QTAILQ_EMPTY(&audio_states)) {
1618         AudioState *s = QTAILQ_FIRST(&audio_states);
1619         QTAILQ_REMOVE(&audio_states, s, list);
1620         free_audio_state(s);
1621     }
1622 }
1623
1624 static const VMStateDescription vmstate_audio = {
1625     .name = "audio",
1626     .version_id = 1,
1627     .minimum_version_id = 1,
1628     .fields = (VMStateField[]) {
1629         VMSTATE_END_OF_LIST()
1630     }
1631 };
1632
1633 static void audio_validate_opts(Audiodev *dev, Error **errp);
1634
1635 static AudiodevListEntry *audiodev_find(
1636     AudiodevListHead *head, const char *drvname)
1637 {
1638     AudiodevListEntry *e;
1639     QSIMPLEQ_FOREACH(e, head, next) {
1640         if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1641             return e;
1642         }
1643     }
1644
1645     return NULL;
1646 }
1647
1648 /*
1649  * if we have dev, this function was called because of an -audiodev argument =>
1650  *   initialize a new state with it
1651  * if dev == NULL => legacy implicit initialization, return the already created
1652  *   state or create a new one
1653  */
1654 static AudioState *audio_init(Audiodev *dev, const char *name)
1655 {
1656     static bool atexit_registered;
1657     size_t i;
1658     int done = 0;
1659     const char *drvname = NULL;
1660     VMChangeStateEntry *e;
1661     AudioState *s;
1662     struct audio_driver *driver;
1663     /* silence gcc warning about uninitialized variable */
1664     AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1665
1666     if (using_spice) {
1667         /*
1668          * When using spice allow the spice audio driver being picked
1669          * as default.
1670          *
1671          * Temporary hack.  Using audio devices without explicit
1672          * audiodev= property is already deprecated.  Same goes for
1673          * the -soundhw switch.  Once this support gets finally
1674          * removed we can also drop the concept of a default audio
1675          * backend and this can go away.
1676          */
1677         driver = audio_driver_lookup("spice");
1678         if (driver) {
1679             driver->can_be_default = 1;
1680         }
1681     }
1682
1683     if (dev) {
1684         /* -audiodev option */
1685         legacy_config = false;
1686         drvname = AudiodevDriver_str(dev->driver);
1687     } else if (!QTAILQ_EMPTY(&audio_states)) {
1688         if (!legacy_config) {
1689             dolog("Device %s: audiodev default parameter is deprecated, please "
1690                   "specify audiodev=%s\n", name,
1691                   QTAILQ_FIRST(&audio_states)->dev->id);
1692         }
1693         return QTAILQ_FIRST(&audio_states);
1694     } else {
1695         /* legacy implicit initialization */
1696         head = audio_handle_legacy_opts();
1697         /*
1698          * In case of legacy initialization, all Audiodevs in the list will have
1699          * the same configuration (except the driver), so it doesn't matter which
1700          * one we chose.  We need an Audiodev to set up AudioState before we can
1701          * init a driver.  Also note that dev at this point is still in the
1702          * list.
1703          */
1704         dev = QSIMPLEQ_FIRST(&head)->dev;
1705         audio_validate_opts(dev, &error_abort);
1706     }
1707
1708     s = g_malloc0(sizeof(AudioState));
1709     s->dev = dev;
1710
1711     QLIST_INIT (&s->hw_head_out);
1712     QLIST_INIT (&s->hw_head_in);
1713     QLIST_INIT (&s->cap_head);
1714     if (!atexit_registered) {
1715         atexit(audio_cleanup);
1716         atexit_registered = true;
1717     }
1718     QTAILQ_INSERT_TAIL(&audio_states, s, list);
1719
1720     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1721
1722     s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1723     s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1724
1725     if (s->nb_hw_voices_out <= 0) {
1726         dolog ("Bogus number of playback voices %d, setting to 1\n",
1727                s->nb_hw_voices_out);
1728         s->nb_hw_voices_out = 1;
1729     }
1730
1731     if (s->nb_hw_voices_in <= 0) {
1732         dolog ("Bogus number of capture voices %d, setting to 0\n",
1733                s->nb_hw_voices_in);
1734         s->nb_hw_voices_in = 0;
1735     }
1736
1737     if (drvname) {
1738         driver = audio_driver_lookup(drvname);
1739         if (driver) {
1740             done = !audio_driver_init(s, driver, true, dev);
1741         } else {
1742             dolog ("Unknown audio driver `%s'\n", drvname);
1743         }
1744     } else {
1745         for (i = 0; audio_prio_list[i]; i++) {
1746             AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1747             driver = audio_driver_lookup(audio_prio_list[i]);
1748
1749             if (e && driver) {
1750                 s->dev = dev = e->dev;
1751                 audio_validate_opts(dev, &error_abort);
1752                 done = !audio_driver_init(s, driver, false, dev);
1753                 if (done) {
1754                     e->dev = NULL;
1755                     break;
1756                 }
1757             }
1758         }
1759     }
1760     audio_free_audiodev_list(&head);
1761
1762     if (!done) {
1763         driver = audio_driver_lookup("none");
1764         done = !audio_driver_init(s, driver, false, dev);
1765         assert(done);
1766         dolog("warning: Using timer based audio emulation\n");
1767     }
1768
1769     if (dev->timer_period <= 0) {
1770         s->period_ticks = 1;
1771     } else {
1772         s->period_ticks = dev->timer_period * (int64_t)SCALE_US;
1773     }
1774
1775     e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1776     if (!e) {
1777         dolog ("warning: Could not register change state handler\n"
1778                "(Audio can continue looping even after stopping the VM)\n");
1779     }
1780
1781     QLIST_INIT (&s->card_head);
1782     vmstate_register (NULL, 0, &vmstate_audio, s);
1783     return s;
1784 }
1785
1786 void audio_free_audiodev_list(AudiodevListHead *head)
1787 {
1788     AudiodevListEntry *e;
1789     while ((e = QSIMPLEQ_FIRST(head))) {
1790         QSIMPLEQ_REMOVE_HEAD(head, next);
1791         qapi_free_Audiodev(e->dev);
1792         g_free(e);
1793     }
1794 }
1795
1796 void AUD_register_card (const char *name, QEMUSoundCard *card)
1797 {
1798     if (!card->state) {
1799         card->state = audio_init(NULL, name);
1800     }
1801
1802     card->name = g_strdup (name);
1803     memset (&card->entries, 0, sizeof (card->entries));
1804     QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1805 }
1806
1807 void AUD_remove_card (QEMUSoundCard *card)
1808 {
1809     QLIST_REMOVE (card, entries);
1810     g_free (card->name);
1811 }
1812
1813
1814 CaptureVoiceOut *AUD_add_capture(
1815     AudioState *s,
1816     struct audsettings *as,
1817     struct audio_capture_ops *ops,
1818     void *cb_opaque
1819     )
1820 {
1821     CaptureVoiceOut *cap;
1822     struct capture_callback *cb;
1823
1824     if (!s) {
1825         if (!legacy_config) {
1826             dolog("Capturing without setting an audiodev is deprecated\n");
1827         }
1828         s = audio_init(NULL, NULL);
1829     }
1830
1831     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1832         dolog("Can't capture with mixeng disabled\n");
1833         return NULL;
1834     }
1835
1836     if (audio_validate_settings (as)) {
1837         dolog ("Invalid settings were passed when trying to add capture\n");
1838         audio_print_settings (as);
1839         return NULL;
1840     }
1841
1842     cb = g_malloc0(sizeof(*cb));
1843     cb->ops = *ops;
1844     cb->opaque = cb_opaque;
1845
1846     cap = audio_pcm_capture_find_specific(s, as);
1847     if (cap) {
1848         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1849         return cap;
1850     } else {
1851         HWVoiceOut *hw;
1852         CaptureVoiceOut *cap;
1853
1854         cap = g_malloc0(sizeof(*cap));
1855
1856         hw = &cap->hw;
1857         hw->s = s;
1858         QLIST_INIT (&hw->sw_head);
1859         QLIST_INIT (&cap->cb_head);
1860
1861         /* XXX find a more elegant way */
1862         hw->samples = 4096 * 4;
1863         audio_pcm_hw_alloc_resources_out(hw);
1864
1865         audio_pcm_init_info (&hw->info, as);
1866
1867         cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1868
1869         if (hw->info.is_float) {
1870             hw->clip = mixeng_clip_float[hw->info.nchannels == 2];
1871         } else {
1872             hw->clip = mixeng_clip
1873                 [hw->info.nchannels == 2]
1874                 [hw->info.is_signed]
1875                 [hw->info.swap_endianness]
1876                 [audio_bits_to_index(hw->info.bits)];
1877         }
1878
1879         QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1880         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1881
1882         QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1883             audio_attach_capture (hw);
1884         }
1885         return cap;
1886     }
1887 }
1888
1889 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1890 {
1891     struct capture_callback *cb;
1892
1893     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1894         if (cb->opaque == cb_opaque) {
1895             cb->ops.destroy (cb_opaque);
1896             QLIST_REMOVE (cb, entries);
1897             g_free (cb);
1898
1899             if (!cap->cb_head.lh_first) {
1900                 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1901
1902                 while (sw) {
1903                     SWVoiceCap *sc = (SWVoiceCap *) sw;
1904 #ifdef DEBUG_CAPTURE
1905                     dolog ("freeing %s\n", sw->name);
1906 #endif
1907
1908                     sw1 = sw->entries.le_next;
1909                     if (sw->rate) {
1910                         st_rate_stop (sw->rate);
1911                         sw->rate = NULL;
1912                     }
1913                     QLIST_REMOVE (sw, entries);
1914                     QLIST_REMOVE (sc, entries);
1915                     g_free (sc);
1916                     sw = sw1;
1917                 }
1918                 QLIST_REMOVE (cap, entries);
1919                 g_free (cap->hw.mix_buf);
1920                 g_free (cap->buf);
1921                 g_free (cap);
1922             }
1923             return;
1924         }
1925     }
1926 }
1927
1928 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1929 {
1930     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1931     audio_set_volume_out(sw, &vol);
1932 }
1933
1934 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1935 {
1936     if (sw) {
1937         HWVoiceOut *hw = sw->hw;
1938
1939         sw->vol.mute = vol->mute;
1940         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1941         sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1942             255;
1943
1944         if (hw->pcm_ops->volume_out) {
1945             hw->pcm_ops->volume_out(hw, vol);
1946         }
1947     }
1948 }
1949
1950 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1951 {
1952     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1953     audio_set_volume_in(sw, &vol);
1954 }
1955
1956 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1957 {
1958     if (sw) {
1959         HWVoiceIn *hw = sw->hw;
1960
1961         sw->vol.mute = vol->mute;
1962         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1963         sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1964             255;
1965
1966         if (hw->pcm_ops->volume_in) {
1967             hw->pcm_ops->volume_in(hw, vol);
1968         }
1969     }
1970 }
1971
1972 void audio_create_pdos(Audiodev *dev)
1973 {
1974     switch (dev->driver) {
1975 #define CASE(DRIVER, driver, pdo_name)                              \
1976     case AUDIODEV_DRIVER_##DRIVER:                                  \
1977         if (!dev->u.driver.has_in) {                                \
1978             dev->u.driver.in = g_malloc0(                           \
1979                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1980             dev->u.driver.has_in = true;                            \
1981         }                                                           \
1982         if (!dev->u.driver.has_out) {                               \
1983             dev->u.driver.out = g_malloc0(                          \
1984                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1985             dev->u.driver.has_out = true;                           \
1986         }                                                           \
1987         break
1988
1989         CASE(NONE, none, );
1990         CASE(ALSA, alsa, Alsa);
1991         CASE(COREAUDIO, coreaudio, Coreaudio);
1992         CASE(DSOUND, dsound, );
1993         CASE(JACK, jack, Jack);
1994         CASE(OSS, oss, Oss);
1995         CASE(PA, pa, Pa);
1996         CASE(SDL, sdl, Sdl);
1997         CASE(SPICE, spice, );
1998         CASE(WAV, wav, );
1999
2000     case AUDIODEV_DRIVER__MAX:
2001         abort();
2002     };
2003 }
2004
2005 static void audio_validate_per_direction_opts(
2006     AudiodevPerDirectionOptions *pdo, Error **errp)
2007 {
2008     if (!pdo->has_mixing_engine) {
2009         pdo->has_mixing_engine = true;
2010         pdo->mixing_engine = true;
2011     }
2012     if (!pdo->has_fixed_settings) {
2013         pdo->has_fixed_settings = true;
2014         pdo->fixed_settings = pdo->mixing_engine;
2015     }
2016     if (!pdo->fixed_settings &&
2017         (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
2018         error_setg(errp,
2019                    "You can't use frequency, channels or format with fixed-settings=off");
2020         return;
2021     }
2022     if (!pdo->mixing_engine && pdo->fixed_settings) {
2023         error_setg(errp, "You can't use fixed-settings without mixeng");
2024         return;
2025     }
2026
2027     if (!pdo->has_frequency) {
2028         pdo->has_frequency = true;
2029         pdo->frequency = 44100;
2030     }
2031     if (!pdo->has_channels) {
2032         pdo->has_channels = true;
2033         pdo->channels = 2;
2034     }
2035     if (!pdo->has_voices) {
2036         pdo->has_voices = true;
2037         pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2038     }
2039     if (!pdo->has_format) {
2040         pdo->has_format = true;
2041         pdo->format = AUDIO_FORMAT_S16;
2042     }
2043 }
2044
2045 static void audio_validate_opts(Audiodev *dev, Error **errp)
2046 {
2047     Error *err = NULL;
2048
2049     audio_create_pdos(dev);
2050
2051     audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2052     if (err) {
2053         error_propagate(errp, err);
2054         return;
2055     }
2056
2057     audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2058     if (err) {
2059         error_propagate(errp, err);
2060         return;
2061     }
2062
2063     if (!dev->has_timer_period) {
2064         dev->has_timer_period = true;
2065         dev->timer_period = 10000; /* 100Hz -> 10ms */
2066     }
2067 }
2068
2069 void audio_parse_option(const char *opt)
2070 {
2071     AudiodevListEntry *e;
2072     Audiodev *dev = NULL;
2073
2074     Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2075     visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2076     visit_free(v);
2077
2078     audio_validate_opts(dev, &error_fatal);
2079
2080     e = g_malloc0(sizeof(AudiodevListEntry));
2081     e->dev = dev;
2082     QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2083 }
2084
2085 void audio_init_audiodevs(void)
2086 {
2087     AudiodevListEntry *e;
2088
2089     QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2090         audio_init(e->dev, NULL);
2091     }
2092 }
2093
2094 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2095 {
2096     return (audsettings) {
2097         .freq = pdo->frequency,
2098         .nchannels = pdo->channels,
2099         .fmt = pdo->format,
2100         .endianness = AUDIO_HOST_ENDIANNESS,
2101     };
2102 }
2103
2104 int audioformat_bytes_per_sample(AudioFormat fmt)
2105 {
2106     switch (fmt) {
2107     case AUDIO_FORMAT_U8:
2108     case AUDIO_FORMAT_S8:
2109         return 1;
2110
2111     case AUDIO_FORMAT_U16:
2112     case AUDIO_FORMAT_S16:
2113         return 2;
2114
2115     case AUDIO_FORMAT_U32:
2116     case AUDIO_FORMAT_S32:
2117     case AUDIO_FORMAT_F32:
2118         return 4;
2119
2120     case AUDIO_FORMAT__MAX:
2121         ;
2122     }
2123     abort();
2124 }
2125
2126
2127 /* frames = freq * usec / 1e6 */
2128 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2129                         audsettings *as, int def_usecs)
2130 {
2131     uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2132     return (as->freq * usecs + 500000) / 1000000;
2133 }
2134
2135 /* samples = channels * frames = channels * freq * usec / 1e6 */
2136 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2137                          audsettings *as, int def_usecs)
2138 {
2139     return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2140 }
2141
2142 /*
2143  * bytes = bytes_per_sample * samples =
2144  *     bytes_per_sample * channels * freq * usec / 1e6
2145  */
2146 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2147                        audsettings *as, int def_usecs)
2148 {
2149     return audio_buffer_samples(pdo, as, def_usecs) *
2150         audioformat_bytes_per_sample(as->fmt);
2151 }
2152
2153 AudioState *audio_state_by_name(const char *name)
2154 {
2155     AudioState *s;
2156     QTAILQ_FOREACH(s, &audio_states, list) {
2157         assert(s->dev);
2158         if (strcmp(name, s->dev->id) == 0) {
2159             return s;
2160         }
2161     }
2162     return NULL;
2163 }
2164
2165 const char *audio_get_id(QEMUSoundCard *card)
2166 {
2167     if (card->state) {
2168         assert(card->state->dev);
2169         return card->state->dev->id;
2170     } else {
2171         return "";
2172     }
2173 }
2174
2175 void audio_rate_start(RateCtl *rate)
2176 {
2177     memset(rate, 0, sizeof(RateCtl));
2178     rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2179 }
2180
2181 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2182                             size_t bytes_avail)
2183 {
2184     int64_t now;
2185     int64_t ticks;
2186     int64_t bytes;
2187     int64_t samples;
2188     size_t ret;
2189
2190     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2191     ticks = now - rate->start_ticks;
2192     bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2193     samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2194     if (samples < 0 || samples > 65536) {
2195         AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2196         audio_rate_start(rate);
2197         samples = 0;
2198     }
2199
2200     ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2201     rate->bytes_sent += ret;
2202     return ret;
2203 }