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 "qemu-common.h"
  36 #include "sysemu/replay.h"
  37 #include "sysemu/runstate.h"
  38 #include "ui/qemu-spice.h"
  39 #include "trace.h"
  40
  41 #define AUDIO_CAP "audio"
  42 #include "audio_int.h"
  43
  44 /* #define DEBUG_LIVE */
  45 /* #define DEBUG_OUT */
  46 /* #define DEBUG_CAPTURE */
  47 /* #define DEBUG_POLL */
  48
  49 #define SW_NAME(sw) (sw)->name ? (sw)->name : "unknown"
  50
  51
  52 /* Order of CONFIG_AUDIO_DRIVERS is import.
  53    The 1st one is the one used by default, that is the reason
  54     that we generate the list.
  55 */
  56 const char *audio_prio_list[] = {
  57     "spice",
  58     CONFIG_AUDIO_DRIVERS
  59     "none",
  60     "wav",
  61     NULL
  62 };
  63
  64 static QLIST_HEAD(, audio_driver) audio_drivers;
  65 static AudiodevListHead audiodevs = QSIMPLEQ_HEAD_INITIALIZER(audiodevs);
  66
  67 void audio_driver_register(audio_driver *drv)
  68 {
  69     QLIST_INSERT_HEAD(&audio_drivers, drv, next);
  70 }
  71
  72 audio_driver *audio_driver_lookup(const char *name)
  73 {
  74     struct audio_driver *d;
  75
  76     QLIST_FOREACH(d, &audio_drivers, next) {
  77         if (strcmp(name, d->name) == 0) {
  78             return d;
  79         }
  80     }
  81
  82     audio_module_load_one(name);
  83     QLIST_FOREACH(d, &audio_drivers, next) {
  84         if (strcmp(name, d->name) == 0) {
  85             return d;
  86         }
  87     }
  88
  89     return NULL;
  90 }
  91
  92 static QTAILQ_HEAD(AudioStateHead, AudioState) audio_states =
  93     QTAILQ_HEAD_INITIALIZER(audio_states);
  94
  95 const struct mixeng_volume nominal_volume = {
  96     .mute = 0,
  97 #ifdef FLOAT_MIXENG
  98     .r = 1.0,
  99     .l = 1.0,
 100 #else
 101     .r = 1ULL << 32,
 102     .l = 1ULL << 32,
 103 #endif
 104 };
 105
 106 static bool legacy_config = true;
 107
 108 int audio_bug (const char *funcname, int cond)
 109 {
 110     if (cond) {
 111         static int shown;
 112
 113         AUD_log (NULL, "A bug was just triggered in %s\n", funcname);
 114         if (!shown) {
 115             shown = 1;
 116             AUD_log (NULL, "Save all your work and restart without audio\n");
 117             AUD_log (NULL, "I am sorry\n");
 118         }
 119         AUD_log (NULL, "Context:\n");
 120         abort();
 121     }
 122
 123     return cond;
 124 }
 125
 126 static inline int audio_bits_to_index (int bits)
 127 {
 128     switch (bits) {
 129     case 8:
 130         return 0;
 131
 132     case 16:
 133         return 1;
 134
 135     case 32:
 136         return 2;
 137
 138     default:
 139         audio_bug ("bits_to_index", 1);
 140         AUD_log (NULL, "invalid bits %d\n", bits);
 141         return 0;
 142     }
 143 }
 144
 145 void *audio_calloc (const char *funcname, int nmemb, size_t size)
 146 {
 147     int cond;
 148     size_t len;
 149
 150     len = nmemb * size;
 151     cond = !nmemb || !size;
 152     cond |= nmemb < 0;
 153     cond |= len < size;
 154
 155     if (audio_bug ("audio_calloc", cond)) {
 156         AUD_log (NULL, "%s passed invalid arguments to audio_calloc\n",
 157                  funcname);
 158         AUD_log (NULL, "nmemb=%d size=%zu (len=%zu)\n", nmemb, size, len);
 159         return NULL;
 160     }
 161
 162     return g_malloc0 (len);
 163 }
 164
 165 void AUD_vlog (const char *cap, const char *fmt, va_list ap)
 166 {
 167     if (cap) {
 168         fprintf(stderr, "%s: ", cap);
 169     }
 170
 171     vfprintf(stderr, fmt, ap);
 172 }
 173
 174 void AUD_log (const char *cap, const char *fmt, ...)
 175 {
 176     va_list ap;
 177
 178     va_start (ap, fmt);
 179     AUD_vlog (cap, fmt, ap);
 180     va_end (ap);
 181 }
 182
 183 static void audio_print_settings (struct audsettings *as)
 184 {
 185     dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels);
 186
 187     switch (as->fmt) {
 188     case AUDIO_FORMAT_S8:
 189         AUD_log (NULL, "S8");
 190         break;
 191     case AUDIO_FORMAT_U8:
 192         AUD_log (NULL, "U8");
 193         break;
 194     case AUDIO_FORMAT_S16:
 195         AUD_log (NULL, "S16");
 196         break;
 197     case AUDIO_FORMAT_U16:
 198         AUD_log (NULL, "U16");
 199         break;
 200     case AUDIO_FORMAT_S32:
 201         AUD_log (NULL, "S32");
 202         break;
 203     case AUDIO_FORMAT_U32:
 204         AUD_log (NULL, "U32");
 205         break;
 206     case AUDIO_FORMAT_F32:
 207         AUD_log (NULL, "F32");
 208         break;
 209     default:
 210         AUD_log (NULL, "invalid(%d)", as->fmt);
 211         break;
 212     }
 213
 214     AUD_log (NULL, " endianness=");
 215     switch (as->endianness) {
 216     case 0:
 217         AUD_log (NULL, "little");
 218         break;
 219     case 1:
 220         AUD_log (NULL, "big");
 221         break;
 222     default:
 223         AUD_log (NULL, "invalid");
 224         break;
 225     }
 226     AUD_log (NULL, "\n");
 227 }
 228
 229 static int audio_validate_settings (struct audsettings *as)
 230 {
 231     int invalid;
 232
 233     invalid = as->nchannels < 1;
 234     invalid |= as->endianness != 0 && as->endianness != 1;
 235
 236     switch (as->fmt) {
 237     case AUDIO_FORMAT_S8:
 238     case AUDIO_FORMAT_U8:
 239     case AUDIO_FORMAT_S16:
 240     case AUDIO_FORMAT_U16:
 241     case AUDIO_FORMAT_S32:
 242     case AUDIO_FORMAT_U32:
 243     case AUDIO_FORMAT_F32:
 244         break;
 245     default:
 246         invalid = 1;
 247         break;
 248     }
 249
 250     invalid |= as->freq <= 0;
 251     return invalid ? -1 : 0;
 252 }
 253
 254 static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as)
 255 {
 256     int bits = 8;
 257     bool is_signed = false, is_float = false;
 258
 259     switch (as->fmt) {
 260     case AUDIO_FORMAT_S8:
 261         is_signed = true;
 262         /* fall through */
 263     case AUDIO_FORMAT_U8:
 264         break;
 265
 266     case AUDIO_FORMAT_S16:
 267         is_signed = true;
 268         /* fall through */
 269     case AUDIO_FORMAT_U16:
 270         bits = 16;
 271         break;
 272
 273     case AUDIO_FORMAT_F32:
 274         is_float = true;
 275         /* fall through */
 276     case AUDIO_FORMAT_S32:
 277         is_signed = true;
 278         /* fall through */
 279     case AUDIO_FORMAT_U32:
 280         bits = 32;
 281         break;
 282
 283     default:
 284         abort();
 285     }
 286     return info->freq == as->freq
 287         && info->nchannels == as->nchannels
 288         && info->is_signed == is_signed
 289         && info->is_float == is_float
 290         && info->bits == bits
 291         && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS);
 292 }
 293
 294 void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as)
 295 {
 296     int bits = 8, mul;
 297     bool is_signed = false, is_float = false;
 298
 299     switch (as->fmt) {
 300     case AUDIO_FORMAT_S8:
 301         is_signed = true;
 302         /* fall through */
 303     case AUDIO_FORMAT_U8:
 304         mul = 1;
 305         break;
 306
 307     case AUDIO_FORMAT_S16:
 308         is_signed = true;
 309         /* fall through */
 310     case AUDIO_FORMAT_U16:
 311         bits = 16;
 312         mul = 2;
 313         break;
 314
 315     case AUDIO_FORMAT_F32:
 316         is_float = true;
 317         /* fall through */
 318     case AUDIO_FORMAT_S32:
 319         is_signed = true;
 320         /* fall through */
 321     case AUDIO_FORMAT_U32:
 322         bits = 32;
 323         mul = 4;
 324         break;
 325
 326     default:
 327         abort();
 328     }
 329
 330     info->freq = as->freq;
 331     info->bits = bits;
 332     info->is_signed = is_signed;
 333     info->is_float = is_float;
 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->is_signed || info->is_float) {
 347         memset(buf, 0x00, len * info->bytes_per_frame);
 348     } else {
 349         switch (info->bits) {
 350         case 8:
 351             memset(buf, 0x80, len * info->bytes_per_frame);
 352             break;
 353
 354         case 16:
 355             {
 356                 int i;
 357                 uint16_t *p = buf;
 358                 short s = INT16_MAX;
 359
 360                 if (info->swap_endianness) {
 361                     s = bswap16 (s);
 362                 }
 363
 364                 for (i = 0; i < len * info->nchannels; i++) {
 365                     p[i] = s;
 366                 }
 367             }
 368             break;
 369
 370         case 32:
 371             {
 372                 int i;
 373                 uint32_t *p = buf;
 374                 int32_t s = INT32_MAX;
 375
 376                 if (info->swap_endianness) {
 377                     s = bswap32 (s);
 378                 }
 379
 380                 for (i = 0; i < len * info->nchannels; i++) {
 381                     p[i] = s;
 382                 }
 383             }
 384             break;
 385
 386         default:
 387             AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n",
 388                      info->bits);
 389             break;
 390         }
 391     }
 392 }
 393
 394 /*
 395  * Capture
 396  */
 397 static void noop_conv (struct st_sample *dst, const void *src, int samples)
 398 {
 399     (void) src;
 400     (void) dst;
 401     (void) samples;
 402 }
 403
 404 static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
 405                                                         struct audsettings *as)
 406 {
 407     CaptureVoiceOut *cap;
 408
 409     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 410         if (audio_pcm_info_eq (&cap->hw.info, as)) {
 411             return cap;
 412         }
 413     }
 414     return NULL;
 415 }
 416
 417 static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd)
 418 {
 419     struct capture_callback *cb;
 420
 421 #ifdef DEBUG_CAPTURE
 422     dolog ("notification %d sent\n", cmd);
 423 #endif
 424     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
 425         cb->ops.notify (cb->opaque, cmd);
 426     }
 427 }
 428
 429 static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled)
 430 {
 431     if (cap->hw.enabled != enabled) {
 432         audcnotification_e cmd;
 433         cap->hw.enabled = enabled;
 434         cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE;
 435         audio_notify_capture (cap, cmd);
 436     }
 437 }
 438
 439 static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap)
 440 {
 441     HWVoiceOut *hw = &cap->hw;
 442     SWVoiceOut *sw;
 443     int enabled = 0;
 444
 445     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 446         if (sw->active) {
 447             enabled = 1;
 448             break;
 449         }
 450     }
 451     audio_capture_maybe_changed (cap, enabled);
 452 }
 453
 454 static void audio_detach_capture (HWVoiceOut *hw)
 455 {
 456     SWVoiceCap *sc = hw->cap_head.lh_first;
 457
 458     while (sc) {
 459         SWVoiceCap *sc1 = sc->entries.le_next;
 460         SWVoiceOut *sw = &sc->sw;
 461         CaptureVoiceOut *cap = sc->cap;
 462         int was_active = sw->active;
 463
 464         if (sw->rate) {
 465             st_rate_stop (sw->rate);
 466             sw->rate = NULL;
 467         }
 468
 469         QLIST_REMOVE (sw, entries);
 470         QLIST_REMOVE (sc, entries);
 471         g_free (sc);
 472         if (was_active) {
 473             /* We have removed soft voice from the capture:
 474                this might have changed the overall status of the capture
 475                since this might have been the only active voice */
 476             audio_recalc_and_notify_capture (cap);
 477         }
 478         sc = sc1;
 479     }
 480 }
 481
 482 static int audio_attach_capture (HWVoiceOut *hw)
 483 {
 484     AudioState *s = hw->s;
 485     CaptureVoiceOut *cap;
 486
 487     audio_detach_capture (hw);
 488     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 489         SWVoiceCap *sc;
 490         SWVoiceOut *sw;
 491         HWVoiceOut *hw_cap = &cap->hw;
 492
 493         sc = g_malloc0(sizeof(*sc));
 494
 495         sc->cap = cap;
 496         sw = &sc->sw;
 497         sw->hw = hw_cap;
 498         sw->info = hw->info;
 499         sw->empty = 1;
 500         sw->active = hw->enabled;
 501         sw->conv = noop_conv;
 502         sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
 503         sw->vol = nominal_volume;
 504         sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
 505         if (!sw->rate) {
 506             dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw));
 507             g_free (sw);
 508             return -1;
 509         }
 510         QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
 511         QLIST_INSERT_HEAD (&hw->cap_head, sc, entries);
 512 #ifdef DEBUG_CAPTURE
 513         sw->name = g_strdup_printf ("for %p %d,%d,%d",
 514                                     hw, sw->info.freq, sw->info.bits,
 515                                     sw->info.nchannels);
 516         dolog ("Added %s active = %d\n", sw->name, sw->active);
 517 #endif
 518         if (sw->active) {
 519             audio_capture_maybe_changed (cap, 1);
 520         }
 521     }
 522     return 0;
 523 }
 524
 525 /*
 526  * Hard voice (capture)
 527  */
 528 static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 529 {
 530     SWVoiceIn *sw;
 531     size_t m = hw->total_samples_captured;
 532
 533     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 534         if (sw->active) {
 535             m = MIN (m, sw->total_hw_samples_acquired);
 536         }
 537     }
 538     return m;
 539 }
 540
 541 static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw)
 542 {
 543     size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 544     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 545         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 546         return 0;
 547     }
 548     return live;
 549 }
 550
 551 static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 552 {
 553     size_t clipped = 0;
 554     size_t pos = hw->mix_buf->pos;
 555
 556     while (len) {
 557         st_sample *src = hw->mix_buf->samples + pos;
 558         uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
 559         size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
 560         size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 561
 562         hw->clip(dst, src, samples_to_clip);
 563
 564         pos = (pos + samples_to_clip) % hw->mix_buf->size;
 565         len -= samples_to_clip;
 566         clipped += samples_to_clip;
 567     }
 568 }
 569
 570 /*
 571  * Soft voice (capture)
 572  */
 573 static size_t audio_pcm_sw_get_rpos_in(SWVoiceIn *sw)
 574 {
 575     HWVoiceIn *hw = sw->hw;
 576     ssize_t live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 577     ssize_t rpos;
 578
 579     if (audio_bug(__func__, live < 0 || live > hw->conv_buf->size)) {
 580         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 581         return 0;
 582     }
 583
 584     rpos = hw->conv_buf->pos - live;
 585     if (rpos >= 0) {
 586         return rpos;
 587     } else {
 588         return hw->conv_buf->size + rpos;
 589     }
 590 }
 591
 592 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 593 {
 594     HWVoiceIn *hw = sw->hw;
 595     size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 596     struct st_sample *src, *dst = sw->buf;
 597
 598     rpos = audio_pcm_sw_get_rpos_in(sw) % hw->conv_buf->size;
 599
 600     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 601     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 602         dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 603         return 0;
 604     }
 605
 606     samples = size / sw->info.bytes_per_frame;
 607     if (!live) {
 608         return 0;
 609     }
 610
 611     swlim = (live * sw->ratio) >> 32;
 612     swlim = MIN (swlim, samples);
 613
 614     while (swlim) {
 615         src = hw->conv_buf->samples + rpos;
 616         if (hw->conv_buf->pos > rpos) {
 617             isamp = hw->conv_buf->pos - rpos;
 618         } else {
 619             isamp = hw->conv_buf->size - rpos;
 620         }
 621
 622         if (!isamp) {
 623             break;
 624         }
 625         osamp = swlim;
 626
 627         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 628         swlim -= osamp;
 629         rpos = (rpos + isamp) % hw->conv_buf->size;
 630         dst += osamp;
 631         ret += osamp;
 632         total += isamp;
 633     }
 634
 635     if (hw->pcm_ops && !hw->pcm_ops->volume_in) {
 636         mixeng_volume (sw->buf, ret, &sw->vol);
 637     }
 638
 639     sw->clip (buf, sw->buf, ret);
 640     sw->total_hw_samples_acquired += total;
 641     return ret * sw->info.bytes_per_frame;
 642 }
 643
 644 /*
 645  * Hard voice (playback)
 646  */
 647 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 648 {
 649     SWVoiceOut *sw;
 650     size_t m = SIZE_MAX;
 651     int nb_live = 0;
 652
 653     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 654         if (sw->active || !sw->empty) {
 655             m = MIN (m, sw->total_hw_samples_mixed);
 656             nb_live += 1;
 657         }
 658     }
 659
 660     *nb_livep = nb_live;
 661     return m;
 662 }
 663
 664 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 665 {
 666     size_t smin;
 667     int nb_live1;
 668
 669     smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 670     if (nb_live) {
 671         *nb_live = nb_live1;
 672     }
 673
 674     if (nb_live1) {
 675         size_t live = smin;
 676
 677         if (audio_bug(__func__, live > hw->mix_buf->size)) {
 678             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 679             return 0;
 680         }
 681         return live;
 682     }
 683     return 0;
 684 }
 685
 686 /*
 687  * Soft voice (playback)
 688  */
 689 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 690 {
 691     size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 692     size_t ret = 0, pos = 0, total = 0;
 693
 694     if (!sw) {
 695         return size;
 696     }
 697
 698     hwsamples = sw->hw->mix_buf->size;
 699
 700     live = sw->total_hw_samples_mixed;
 701     if (audio_bug(__func__, live > hwsamples)) {
 702         dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 703         return 0;
 704     }
 705
 706     if (live == hwsamples) {
 707 #ifdef DEBUG_OUT
 708         dolog ("%s is full %zu\n", sw->name, live);
 709 #endif
 710         return 0;
 711     }
 712
 713     wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 714     samples = size / sw->info.bytes_per_frame;
 715
 716     dead = hwsamples - live;
 717     swlim = ((int64_t) dead << 32) / sw->ratio;
 718     swlim = MIN (swlim, samples);
 719     if (swlim) {
 720         sw->conv (sw->buf, buf, swlim);
 721
 722         if (sw->hw->pcm_ops && !sw->hw->pcm_ops->volume_out) {
 723             mixeng_volume (sw->buf, swlim, &sw->vol);
 724         }
 725     }
 726
 727     while (swlim) {
 728         dead = hwsamples - live;
 729         left = hwsamples - wpos;
 730         blck = MIN (dead, left);
 731         if (!blck) {
 732             break;
 733         }
 734         isamp = swlim;
 735         osamp = blck;
 736         st_rate_flow_mix (
 737             sw->rate,
 738             sw->buf + pos,
 739             sw->hw->mix_buf->samples + wpos,
 740             &isamp,
 741             &osamp
 742             );
 743         ret += isamp;
 744         swlim -= isamp;
 745         pos += isamp;
 746         live += osamp;
 747         wpos = (wpos + osamp) % hwsamples;
 748         total += osamp;
 749     }
 750
 751     sw->total_hw_samples_mixed += total;
 752     sw->empty = sw->total_hw_samples_mixed == 0;
 753
 754 #ifdef DEBUG_OUT
 755     dolog (
 756         "%s: write size %zu ret %zu total sw %zu\n",
 757         SW_NAME (sw),
 758         size / sw->info.bytes_per_frame,
 759         ret,
 760         sw->total_hw_samples_mixed
 761         );
 762 #endif
 763
 764     return ret * sw->info.bytes_per_frame;
 765 }
 766
 767 #ifdef DEBUG_AUDIO
 768 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 769 {
 770     dolog("%s: bits %d, sign %d, float %d, freq %d, nchan %d\n",
 771           cap, info->bits, info->is_signed, info->is_float, info->freq,
 772           info->nchannels);
 773 }
 774 #endif
 775
 776 #define DAC
 777 #include "audio_template.h"
 778 #undef DAC
 779 #include "audio_template.h"
 780
 781 /*
 782  * Timer
 783  */
 784 static int audio_is_timer_needed(AudioState *s)
 785 {
 786     HWVoiceIn *hwi = NULL;
 787     HWVoiceOut *hwo = NULL;
 788
 789     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
 790         if (!hwo->poll_mode) {
 791             return 1;
 792         }
 793     }
 794     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
 795         if (!hwi->poll_mode) {
 796             return 1;
 797         }
 798     }
 799     return 0;
 800 }
 801
 802 static void audio_reset_timer (AudioState *s)
 803 {
 804     if (audio_is_timer_needed(s)) {
 805         timer_mod_anticipate_ns(s->ts,
 806             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
 807         if (!s->timer_running) {
 808             s->timer_running = true;
 809             s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 810             trace_audio_timer_start(s->period_ticks / SCALE_MS);
 811         }
 812     } else {
 813         timer_del(s->ts);
 814         if (s->timer_running) {
 815             s->timer_running = false;
 816             trace_audio_timer_stop();
 817         }
 818     }
 819 }
 820
 821 static void audio_timer (void *opaque)
 822 {
 823     int64_t now, diff;
 824     AudioState *s = opaque;
 825
 826     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 827     diff = now - s->timer_last;
 828     if (diff > s->period_ticks * 3 / 2) {
 829         trace_audio_timer_delayed(diff / SCALE_MS);
 830     }
 831     s->timer_last = now;
 832
 833     audio_run(s, "timer");
 834     audio_reset_timer(s);
 835 }
 836
 837 /*
 838  * Public API
 839  */
 840 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size)
 841 {
 842     HWVoiceOut *hw;
 843
 844     if (!sw) {
 845         /* XXX: Consider options */
 846         return size;
 847     }
 848     hw = sw->hw;
 849
 850     if (!hw->enabled) {
 851         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 852         return 0;
 853     }
 854
 855     if (audio_get_pdo_out(hw->s->dev)->mixing_engine) {
 856         return audio_pcm_sw_write(sw, buf, size);
 857     } else {
 858         return hw->pcm_ops->write(hw, buf, size);
 859     }
 860 }
 861
 862 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size)
 863 {
 864     HWVoiceIn *hw;
 865
 866     if (!sw) {
 867         /* XXX: Consider options */
 868         return size;
 869     }
 870     hw = sw->hw;
 871
 872     if (!hw->enabled) {
 873         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 874         return 0;
 875     }
 876
 877     if (audio_get_pdo_in(hw->s->dev)->mixing_engine) {
 878         return audio_pcm_sw_read(sw, buf, size);
 879     } else {
 880         return hw->pcm_ops->read(hw, buf, size);
 881     }
 882 }
 883
 884 int AUD_get_buffer_size_out(SWVoiceOut *sw)
 885 {
 886     return sw->hw->samples * sw->hw->info.bytes_per_frame;
 887 }
 888
 889 void AUD_set_active_out (SWVoiceOut *sw, int on)
 890 {
 891     HWVoiceOut *hw;
 892
 893     if (!sw) {
 894         return;
 895     }
 896
 897     hw = sw->hw;
 898     if (sw->active != on) {
 899         AudioState *s = sw->s;
 900         SWVoiceOut *temp_sw;
 901         SWVoiceCap *sc;
 902
 903         if (on) {
 904             hw->pending_disable = 0;
 905             if (!hw->enabled) {
 906                 hw->enabled = 1;
 907                 if (s->vm_running) {
 908                     if (hw->pcm_ops->enable_out) {
 909                         hw->pcm_ops->enable_out(hw, true);
 910                     }
 911                     audio_reset_timer (s);
 912                 }
 913             }
 914         } else {
 915             if (hw->enabled) {
 916                 int nb_active = 0;
 917
 918                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 919                      temp_sw = temp_sw->entries.le_next) {
 920                     nb_active += temp_sw->active != 0;
 921                 }
 922
 923                 hw->pending_disable = nb_active == 1;
 924             }
 925         }
 926
 927         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
 928             sc->sw.active = hw->enabled;
 929             if (hw->enabled) {
 930                 audio_capture_maybe_changed (sc->cap, 1);
 931             }
 932         }
 933         sw->active = on;
 934     }
 935 }
 936
 937 void AUD_set_active_in (SWVoiceIn *sw, int on)
 938 {
 939     HWVoiceIn *hw;
 940
 941     if (!sw) {
 942         return;
 943     }
 944
 945     hw = sw->hw;
 946     if (sw->active != on) {
 947         AudioState *s = sw->s;
 948         SWVoiceIn *temp_sw;
 949
 950         if (on) {
 951             if (!hw->enabled) {
 952                 hw->enabled = 1;
 953                 if (s->vm_running) {
 954                     if (hw->pcm_ops->enable_in) {
 955                         hw->pcm_ops->enable_in(hw, true);
 956                     }
 957                     audio_reset_timer (s);
 958                 }
 959             }
 960             sw->total_hw_samples_acquired = hw->total_samples_captured;
 961         } else {
 962             if (hw->enabled) {
 963                 int nb_active = 0;
 964
 965                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 966                      temp_sw = temp_sw->entries.le_next) {
 967                     nb_active += temp_sw->active != 0;
 968                 }
 969
 970                 if (nb_active == 1) {
 971                     hw->enabled = 0;
 972                     if (hw->pcm_ops->enable_in) {
 973                         hw->pcm_ops->enable_in(hw, false);
 974                     }
 975                 }
 976             }
 977         }
 978         sw->active = on;
 979     }
 980 }
 981
 982 static size_t audio_get_avail (SWVoiceIn *sw)
 983 {
 984     size_t live;
 985
 986     if (!sw) {
 987         return 0;
 988     }
 989
 990     live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
 991     if (audio_bug(__func__, live > sw->hw->conv_buf->size)) {
 992         dolog("live=%zu sw->hw->conv_buf->size=%zu\n", live,
 993               sw->hw->conv_buf->size);
 994         return 0;
 995     }
 996
 997     ldebug (
 998         "%s: get_avail live %zu ret %" PRId64 "\n",
 999         SW_NAME (sw),
1000         live, (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame
1001         );
1002
1003     return (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame;
1004 }
1005
1006 static size_t audio_get_free(SWVoiceOut *sw)
1007 {
1008     size_t live, dead;
1009
1010     if (!sw) {
1011         return 0;
1012     }
1013
1014     live = sw->total_hw_samples_mixed;
1015
1016     if (audio_bug(__func__, live > sw->hw->mix_buf->size)) {
1017         dolog("live=%zu sw->hw->mix_buf->size=%zu\n", live,
1018               sw->hw->mix_buf->size);
1019         return 0;
1020     }
1021
1022     dead = sw->hw->mix_buf->size - live;
1023
1024 #ifdef DEBUG_OUT
1025     dolog ("%s: get_free live %zu dead %zu ret %" PRId64 "\n",
1026            SW_NAME (sw),
1027            live, dead, (((int64_t) dead << 32) / sw->ratio) *
1028            sw->info.bytes_per_frame);
1029 #endif
1030
1031     return (((int64_t) dead << 32) / sw->ratio) * sw->info.bytes_per_frame;
1032 }
1033
1034 static void audio_capture_mix_and_clear(HWVoiceOut *hw, size_t rpos,
1035                                         size_t samples)
1036 {
1037     size_t n;
1038
1039     if (hw->enabled) {
1040         SWVoiceCap *sc;
1041
1042         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1043             SWVoiceOut *sw = &sc->sw;
1044             int rpos2 = rpos;
1045
1046             n = samples;
1047             while (n) {
1048                 size_t till_end_of_hw = hw->mix_buf->size - rpos2;
1049                 size_t to_write = MIN(till_end_of_hw, n);
1050                 size_t bytes = to_write * hw->info.bytes_per_frame;
1051                 size_t written;
1052
1053                 sw->buf = hw->mix_buf->samples + rpos2;
1054                 written = audio_pcm_sw_write (sw, NULL, bytes);
1055                 if (written - bytes) {
1056                     dolog("Could not mix %zu bytes into a capture "
1057                           "buffer, mixed %zu\n",
1058                           bytes, written);
1059                     break;
1060                 }
1061                 n -= to_write;
1062                 rpos2 = (rpos2 + to_write) % hw->mix_buf->size;
1063             }
1064         }
1065     }
1066
1067     n = MIN(samples, hw->mix_buf->size - rpos);
1068     mixeng_clear(hw->mix_buf->samples + rpos, n);
1069     mixeng_clear(hw->mix_buf->samples, samples - n);
1070 }
1071
1072 static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
1073 {
1074     size_t clipped = 0;
1075
1076     while (live) {
1077         size_t size = live * hw->info.bytes_per_frame;
1078         size_t decr, proc;
1079         void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
1080
1081         if (size == 0) {
1082             break;
1083         }
1084
1085         decr = MIN(size / hw->info.bytes_per_frame, live);
1086         if (buf) {
1087             audio_pcm_hw_clip_out(hw, buf, decr);
1088         }
1089         proc = hw->pcm_ops->put_buffer_out(hw, buf,
1090                                            decr * hw->info.bytes_per_frame) /
1091             hw->info.bytes_per_frame;
1092
1093         live -= proc;
1094         clipped += proc;
1095         hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size;
1096
1097         if (proc == 0 || proc < decr) {
1098             break;
1099         }
1100     }
1101
1102     if (hw->pcm_ops->run_buffer_out) {
1103         hw->pcm_ops->run_buffer_out(hw);
1104     }
1105
1106     return clipped;
1107 }
1108
1109 static void audio_run_out (AudioState *s)
1110 {
1111     HWVoiceOut *hw = NULL;
1112     SWVoiceOut *sw;
1113
1114     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1115         while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1116             /* there is exactly 1 sw for each hw with no mixeng */
1117             sw = hw->sw_head.lh_first;
1118
1119             if (hw->pending_disable) {
1120                 hw->enabled = 0;
1121                 hw->pending_disable = 0;
1122                 if (hw->pcm_ops->enable_out) {
1123                     hw->pcm_ops->enable_out(hw, false);
1124                 }
1125             }
1126
1127             if (sw->active) {
1128                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1129             }
1130         }
1131         return;
1132     }
1133
1134     while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1135         size_t played, live, prev_rpos, free;
1136         int nb_live;
1137
1138         live = audio_pcm_hw_get_live_out (hw, &nb_live);
1139         if (!nb_live) {
1140             live = 0;
1141         }
1142
1143         if (audio_bug(__func__, live > hw->mix_buf->size)) {
1144             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
1145             continue;
1146         }
1147
1148         if (hw->pending_disable && !nb_live) {
1149             SWVoiceCap *sc;
1150 #ifdef DEBUG_OUT
1151             dolog ("Disabling voice\n");
1152 #endif
1153             hw->enabled = 0;
1154             hw->pending_disable = 0;
1155             if (hw->pcm_ops->enable_out) {
1156                 hw->pcm_ops->enable_out(hw, false);
1157             }
1158             for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1159                 sc->sw.active = 0;
1160                 audio_recalc_and_notify_capture (sc->cap);
1161             }
1162             continue;
1163         }
1164
1165         if (!live) {
1166             for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1167                 if (sw->active) {
1168                     free = audio_get_free (sw);
1169                     if (free > 0) {
1170                         sw->callback.fn (sw->callback.opaque, free);
1171                     }
1172                 }
1173             }
1174             if (hw->pcm_ops->run_buffer_out) {
1175                 hw->pcm_ops->run_buffer_out(hw);
1176             }
1177             continue;
1178         }
1179
1180         prev_rpos = hw->mix_buf->pos;
1181         played = audio_pcm_hw_run_out(hw, live);
1182         replay_audio_out(&played);
1183         if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) {
1184             dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n",
1185                   hw->mix_buf->pos, hw->mix_buf->size, played);
1186             hw->mix_buf->pos = 0;
1187         }
1188
1189 #ifdef DEBUG_OUT
1190         dolog("played=%zu\n", played);
1191 #endif
1192
1193         if (played) {
1194             hw->ts_helper += played;
1195             audio_capture_mix_and_clear (hw, prev_rpos, played);
1196         }
1197
1198         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1199             if (!sw->active && sw->empty) {
1200                 continue;
1201             }
1202
1203             if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) {
1204                 dolog("played=%zu sw->total_hw_samples_mixed=%zu\n",
1205                       played, sw->total_hw_samples_mixed);
1206                 played = sw->total_hw_samples_mixed;
1207             }
1208
1209             sw->total_hw_samples_mixed -= played;
1210
1211             if (!sw->total_hw_samples_mixed) {
1212                 sw->empty = 1;
1213             }
1214
1215             if (sw->active) {
1216                 free = audio_get_free (sw);
1217                 if (free > 0) {
1218                     sw->callback.fn (sw->callback.opaque, free);
1219                 }
1220             }
1221         }
1222     }
1223 }
1224
1225 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1226 {
1227     size_t conv = 0;
1228     STSampleBuffer *conv_buf = hw->conv_buf;
1229
1230     if (hw->pcm_ops->run_buffer_in) {
1231         hw->pcm_ops->run_buffer_in(hw);
1232     }
1233
1234     while (samples) {
1235         size_t proc;
1236         size_t size = samples * hw->info.bytes_per_frame;
1237         void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1238
1239         assert(size % hw->info.bytes_per_frame == 0);
1240         if (size == 0) {
1241             break;
1242         }
1243
1244         proc = MIN(size / hw->info.bytes_per_frame,
1245                    conv_buf->size - conv_buf->pos);
1246
1247         hw->conv(conv_buf->samples + conv_buf->pos, buf, proc);
1248         conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
1249
1250         samples -= proc;
1251         conv += proc;
1252         hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1253     }
1254
1255     return conv;
1256 }
1257
1258 static void audio_run_in (AudioState *s)
1259 {
1260     HWVoiceIn *hw = NULL;
1261
1262     if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1263         while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1264             /* there is exactly 1 sw for each hw with no mixeng */
1265             SWVoiceIn *sw = hw->sw_head.lh_first;
1266             if (sw->active) {
1267                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1268             }
1269         }
1270         return;
1271     }
1272
1273     while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1274         SWVoiceIn *sw;
1275         size_t captured = 0, min;
1276
1277         if (replay_mode != REPLAY_MODE_PLAY) {
1278             captured = audio_pcm_hw_run_in(
1279                 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1280         }
1281         replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1282                         hw->conv_buf->size);
1283
1284         min = audio_pcm_hw_find_min_in (hw);
1285         hw->total_samples_captured += captured - min;
1286         hw->ts_helper += captured;
1287
1288         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1289             sw->total_hw_samples_acquired -= min;
1290
1291             if (sw->active) {
1292                 size_t avail;
1293
1294                 avail = audio_get_avail (sw);
1295                 if (avail > 0) {
1296                     sw->callback.fn (sw->callback.opaque, avail);
1297                 }
1298             }
1299         }
1300     }
1301 }
1302
1303 static void audio_run_capture (AudioState *s)
1304 {
1305     CaptureVoiceOut *cap;
1306
1307     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1308         size_t live, rpos, captured;
1309         HWVoiceOut *hw = &cap->hw;
1310         SWVoiceOut *sw;
1311
1312         captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1313         rpos = hw->mix_buf->pos;
1314         while (live) {
1315             size_t left = hw->mix_buf->size - rpos;
1316             size_t to_capture = MIN(live, left);
1317             struct st_sample *src;
1318             struct capture_callback *cb;
1319
1320             src = hw->mix_buf->samples + rpos;
1321             hw->clip (cap->buf, src, to_capture);
1322             mixeng_clear (src, to_capture);
1323
1324             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1325                 cb->ops.capture (cb->opaque, cap->buf,
1326                                  to_capture * hw->info.bytes_per_frame);
1327             }
1328             rpos = (rpos + to_capture) % hw->mix_buf->size;
1329             live -= to_capture;
1330         }
1331         hw->mix_buf->pos = rpos;
1332
1333         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1334             if (!sw->active && sw->empty) {
1335                 continue;
1336             }
1337
1338             if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1339                 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1340                       captured, sw->total_hw_samples_mixed);
1341                 captured = sw->total_hw_samples_mixed;
1342             }
1343
1344             sw->total_hw_samples_mixed -= captured;
1345             sw->empty = sw->total_hw_samples_mixed == 0;
1346         }
1347     }
1348 }
1349
1350 void audio_run(AudioState *s, const char *msg)
1351 {
1352     audio_run_out(s);
1353     audio_run_in(s);
1354     audio_run_capture(s);
1355
1356 #ifdef DEBUG_POLL
1357     {
1358         static double prevtime;
1359         double currtime;
1360         struct timeval tv;
1361
1362         if (gettimeofday (&tv, NULL)) {
1363             perror ("audio_run: gettimeofday");
1364             return;
1365         }
1366
1367         currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1368         dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1369         prevtime = currtime;
1370     }
1371 #endif
1372 }
1373
1374 void audio_generic_run_buffer_in(HWVoiceIn *hw)
1375 {
1376     if (unlikely(!hw->buf_emul)) {
1377         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
1378         hw->buf_emul = g_malloc(hw->size_emul);
1379         hw->pos_emul = hw->pending_emul = 0;
1380     }
1381
1382     while (hw->pending_emul < hw->size_emul) {
1383         size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1384                               hw->size_emul - hw->pending_emul);
1385         size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1386                                         read_len);
1387         hw->pending_emul += read;
1388         hw->pos_emul = (hw->pos_emul + read) % hw->size_emul;
1389         if (read < read_len) {
1390             break;
1391         }
1392     }
1393 }
1394
1395 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1396 {
1397     ssize_t start = (ssize_t)hw->pos_emul - hw->pending_emul;
1398
1399     if (start < 0) {
1400         start += hw->size_emul;
1401     }
1402     assert(start >= 0 && start < hw->size_emul);
1403
1404     *size = MIN(*size, hw->pending_emul);
1405     *size = MIN(*size, hw->size_emul - start);
1406     return hw->buf_emul + start;
1407 }
1408
1409 void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
1410 {
1411     assert(size <= hw->pending_emul);
1412     hw->pending_emul -= size;
1413 }
1414
1415 void audio_generic_run_buffer_out(HWVoiceOut *hw)
1416 {
1417     while (hw->pending_emul) {
1418         size_t write_len, written;
1419         ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1420
1421         if (start < 0) {
1422             start += hw->size_emul;
1423         }
1424         assert(start >= 0 && start < hw->size_emul);
1425
1426         write_len = MIN(hw->pending_emul, hw->size_emul - start);
1427
1428         written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1429         hw->pending_emul -= written;
1430
1431         if (written < write_len) {
1432             break;
1433         }
1434     }
1435 }
1436
1437 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1438 {
1439     if (unlikely(!hw->buf_emul)) {
1440         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
1441         hw->buf_emul = g_malloc(hw->size_emul);
1442         hw->pos_emul = hw->pending_emul = 0;
1443     }
1444
1445     *size = MIN(hw->size_emul - hw->pending_emul,
1446                 hw->size_emul - hw->pos_emul);
1447     return hw->buf_emul + hw->pos_emul;
1448 }
1449
1450 size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
1451 {
1452     assert(buf == hw->buf_emul + hw->pos_emul &&
1453            size + hw->pending_emul <= hw->size_emul);
1454
1455     hw->pending_emul += size;
1456     hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
1457
1458     return size;
1459 }
1460
1461 size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size)
1462 {
1463     size_t total = 0;
1464
1465     while (total < size) {
1466         size_t dst_size = size - total;
1467         size_t copy_size, proc;
1468         void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1469
1470         if (dst_size == 0) {
1471             break;
1472         }
1473
1474         copy_size = MIN(size - total, dst_size);
1475         if (dst) {
1476             memcpy(dst, (char *)buf + total, copy_size);
1477         }
1478         proc = hw->pcm_ops->put_buffer_out(hw, dst, copy_size);
1479         total += proc;
1480
1481         if (proc == 0 || proc < copy_size) {
1482             break;
1483         }
1484     }
1485
1486     if (hw->pcm_ops->run_buffer_out) {
1487         hw->pcm_ops->run_buffer_out(hw);
1488     }
1489
1490     return total;
1491 }
1492
1493 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1494 {
1495     size_t total = 0;
1496
1497     if (hw->pcm_ops->run_buffer_in) {
1498         hw->pcm_ops->run_buffer_in(hw);
1499     }
1500
1501     while (total < size) {
1502         size_t src_size = size - total;
1503         void *src = hw->pcm_ops->get_buffer_in(hw, &src_size);
1504
1505         if (src_size == 0) {
1506             break;
1507         }
1508
1509         memcpy((char *)buf + total, src, src_size);
1510         hw->pcm_ops->put_buffer_in(hw, src, src_size);
1511         total += src_size;
1512     }
1513
1514     return total;
1515 }
1516
1517 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1518                              bool msg, Audiodev *dev)
1519 {
1520     s->drv_opaque = drv->init(dev);
1521
1522     if (s->drv_opaque) {
1523         if (!drv->pcm_ops->get_buffer_in) {
1524             drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1525             drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1526         }
1527         if (!drv->pcm_ops->get_buffer_out) {
1528             drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1529             drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1530         }
1531
1532         audio_init_nb_voices_out(s, drv);
1533         audio_init_nb_voices_in(s, drv);
1534         s->drv = drv;
1535         return 0;
1536     } else {
1537         if (msg) {
1538             dolog("Could not init `%s' audio driver\n", drv->name);
1539         }
1540         return -1;
1541     }
1542 }
1543
1544 static void audio_vm_change_state_handler (void *opaque, bool running,
1545                                            RunState state)
1546 {
1547     AudioState *s = opaque;
1548     HWVoiceOut *hwo = NULL;
1549     HWVoiceIn *hwi = NULL;
1550
1551     s->vm_running = running;
1552     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1553         if (hwo->pcm_ops->enable_out) {
1554             hwo->pcm_ops->enable_out(hwo, running);
1555         }
1556     }
1557
1558     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1559         if (hwi->pcm_ops->enable_in) {
1560             hwi->pcm_ops->enable_in(hwi, running);
1561         }
1562     }
1563     audio_reset_timer (s);
1564 }
1565
1566 static void free_audio_state(AudioState *s)
1567 {
1568     HWVoiceOut *hwo, *hwon;
1569     HWVoiceIn *hwi, *hwin;
1570
1571     QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1572         SWVoiceCap *sc;
1573
1574         if (hwo->enabled && hwo->pcm_ops->enable_out) {
1575             hwo->pcm_ops->enable_out(hwo, false);
1576         }
1577         hwo->pcm_ops->fini_out (hwo);
1578
1579         for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1580             CaptureVoiceOut *cap = sc->cap;
1581             struct capture_callback *cb;
1582
1583             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1584                 cb->ops.destroy (cb->opaque);
1585             }
1586         }
1587         QLIST_REMOVE(hwo, entries);
1588     }
1589
1590     QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1591         if (hwi->enabled && hwi->pcm_ops->enable_in) {
1592             hwi->pcm_ops->enable_in(hwi, false);
1593         }
1594         hwi->pcm_ops->fini_in (hwi);
1595         QLIST_REMOVE(hwi, entries);
1596     }
1597
1598     if (s->drv) {
1599         s->drv->fini (s->drv_opaque);
1600         s->drv = NULL;
1601     }
1602
1603     if (s->dev) {
1604         qapi_free_Audiodev(s->dev);
1605         s->dev = NULL;
1606     }
1607
1608     if (s->ts) {
1609         timer_free(s->ts);
1610         s->ts = NULL;
1611     }
1612
1613     g_free(s);
1614 }
1615
1616 void audio_cleanup(void)
1617 {
1618     while (!QTAILQ_EMPTY(&audio_states)) {
1619         AudioState *s = QTAILQ_FIRST(&audio_states);
1620         QTAILQ_REMOVE(&audio_states, s, list);
1621         free_audio_state(s);
1622     }
1623 }
1624
1625 static const VMStateDescription vmstate_audio = {
1626     .name = "audio",
1627     .version_id = 1,
1628     .minimum_version_id = 1,
1629     .fields = (VMStateField[]) {
1630         VMSTATE_END_OF_LIST()
1631     }
1632 };
1633
1634 static void audio_validate_opts(Audiodev *dev, Error **errp);
1635
1636 static AudiodevListEntry *audiodev_find(
1637     AudiodevListHead *head, const char *drvname)
1638 {
1639     AudiodevListEntry *e;
1640     QSIMPLEQ_FOREACH(e, head, next) {
1641         if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1642             return e;
1643         }
1644     }
1645
1646     return NULL;
1647 }
1648
1649 /*
1650  * if we have dev, this function was called because of an -audiodev argument =>
1651  *   initialize a new state with it
1652  * if dev == NULL => legacy implicit initialization, return the already created
1653  *   state or create a new one
1654  */
1655 static AudioState *audio_init(Audiodev *dev, const char *name)
1656 {
1657     static bool atexit_registered;
1658     size_t i;
1659     int done = 0;
1660     const char *drvname = NULL;
1661     VMChangeStateEntry *e;
1662     AudioState *s;
1663     struct audio_driver *driver;
1664     /* silence gcc warning about uninitialized variable */
1665     AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1666
1667     if (using_spice) {
1668         /*
1669          * When using spice allow the spice audio driver being picked
1670          * as default.
1671          *
1672          * Temporary hack.  Using audio devices without explicit
1673          * audiodev= property is already deprecated.  Same goes for
1674          * the -soundhw switch.  Once this support gets finally
1675          * removed we can also drop the concept of a default audio
1676          * backend and this can go away.
1677          */
1678         driver = audio_driver_lookup("spice");
1679         if (driver) {
1680             driver->can_be_default = 1;
1681         }
1682     }
1683
1684     if (dev) {
1685         /* -audiodev option */
1686         legacy_config = false;
1687         drvname = AudiodevDriver_str(dev->driver);
1688     } else if (!QTAILQ_EMPTY(&audio_states)) {
1689         if (!legacy_config) {
1690             dolog("Device %s: audiodev default parameter is deprecated, please "
1691                   "specify audiodev=%s\n", name,
1692                   QTAILQ_FIRST(&audio_states)->dev->id);
1693         }
1694         return QTAILQ_FIRST(&audio_states);
1695     } else {
1696         /* legacy implicit initialization */
1697         head = audio_handle_legacy_opts();
1698         /*
1699          * In case of legacy initialization, all Audiodevs in the list will have
1700          * the same configuration (except the driver), so it doesn't matter which
1701          * one we chose.  We need an Audiodev to set up AudioState before we can
1702          * init a driver.  Also note that dev at this point is still in the
1703          * list.
1704          */
1705         dev = QSIMPLEQ_FIRST(&head)->dev;
1706         audio_validate_opts(dev, &error_abort);
1707     }
1708
1709     s = g_malloc0(sizeof(AudioState));
1710     s->dev = dev;
1711
1712     QLIST_INIT (&s->hw_head_out);
1713     QLIST_INIT (&s->hw_head_in);
1714     QLIST_INIT (&s->cap_head);
1715     if (!atexit_registered) {
1716         atexit(audio_cleanup);
1717         atexit_registered = true;
1718     }
1719     QTAILQ_INSERT_TAIL(&audio_states, s, list);
1720
1721     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1722
1723     s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1724     s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1725
1726     if (s->nb_hw_voices_out <= 0) {
1727         dolog ("Bogus number of playback voices %d, setting to 1\n",
1728                s->nb_hw_voices_out);
1729         s->nb_hw_voices_out = 1;
1730     }
1731
1732     if (s->nb_hw_voices_in <= 0) {
1733         dolog ("Bogus number of capture voices %d, setting to 0\n",
1734                s->nb_hw_voices_in);
1735         s->nb_hw_voices_in = 0;
1736     }
1737
1738     if (drvname) {
1739         driver = audio_driver_lookup(drvname);
1740         if (driver) {
1741             done = !audio_driver_init(s, driver, true, dev);
1742         } else {
1743             dolog ("Unknown audio driver `%s'\n", drvname);
1744         }
1745     } else {
1746         for (i = 0; audio_prio_list[i]; i++) {
1747             AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1748             driver = audio_driver_lookup(audio_prio_list[i]);
1749
1750             if (e && driver) {
1751                 s->dev = dev = e->dev;
1752                 audio_validate_opts(dev, &error_abort);
1753                 done = !audio_driver_init(s, driver, false, dev);
1754                 if (done) {
1755                     e->dev = NULL;
1756                     break;
1757                 }
1758             }
1759         }
1760     }
1761     audio_free_audiodev_list(&head);
1762
1763     if (!done) {
1764         driver = audio_driver_lookup("none");
1765         done = !audio_driver_init(s, driver, false, dev);
1766         assert(done);
1767         dolog("warning: Using timer based audio emulation\n");
1768     }
1769
1770     if (dev->timer_period <= 0) {
1771         s->period_ticks = 1;
1772     } else {
1773         s->period_ticks = dev->timer_period * (int64_t)SCALE_US;
1774     }
1775
1776     e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1777     if (!e) {
1778         dolog ("warning: Could not register change state handler\n"
1779                "(Audio can continue looping even after stopping the VM)\n");
1780     }
1781
1782     QLIST_INIT (&s->card_head);
1783     vmstate_register (NULL, 0, &vmstate_audio, s);
1784     return s;
1785 }
1786
1787 void audio_free_audiodev_list(AudiodevListHead *head)
1788 {
1789     AudiodevListEntry *e;
1790     while ((e = QSIMPLEQ_FIRST(head))) {
1791         QSIMPLEQ_REMOVE_HEAD(head, next);
1792         qapi_free_Audiodev(e->dev);
1793         g_free(e);
1794     }
1795 }
1796
1797 void AUD_register_card (const char *name, QEMUSoundCard *card)
1798 {
1799     if (!card->state) {
1800         card->state = audio_init(NULL, name);
1801     }
1802
1803     card->name = g_strdup (name);
1804     memset (&card->entries, 0, sizeof (card->entries));
1805     QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1806 }
1807
1808 void AUD_remove_card (QEMUSoundCard *card)
1809 {
1810     QLIST_REMOVE (card, entries);
1811     g_free (card->name);
1812 }
1813
1814
1815 CaptureVoiceOut *AUD_add_capture(
1816     AudioState *s,
1817     struct audsettings *as,
1818     struct audio_capture_ops *ops,
1819     void *cb_opaque
1820     )
1821 {
1822     CaptureVoiceOut *cap;
1823     struct capture_callback *cb;
1824
1825     if (!s) {
1826         if (!legacy_config) {
1827             dolog("Capturing without setting an audiodev is deprecated\n");
1828         }
1829         s = audio_init(NULL, NULL);
1830     }
1831
1832     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1833         dolog("Can't capture with mixeng disabled\n");
1834         return NULL;
1835     }
1836
1837     if (audio_validate_settings (as)) {
1838         dolog ("Invalid settings were passed when trying to add capture\n");
1839         audio_print_settings (as);
1840         return NULL;
1841     }
1842
1843     cb = g_malloc0(sizeof(*cb));
1844     cb->ops = *ops;
1845     cb->opaque = cb_opaque;
1846
1847     cap = audio_pcm_capture_find_specific(s, as);
1848     if (cap) {
1849         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1850         return cap;
1851     } else {
1852         HWVoiceOut *hw;
1853         CaptureVoiceOut *cap;
1854
1855         cap = g_malloc0(sizeof(*cap));
1856
1857         hw = &cap->hw;
1858         hw->s = s;
1859         QLIST_INIT (&hw->sw_head);
1860         QLIST_INIT (&cap->cb_head);
1861
1862         /* XXX find a more elegant way */
1863         hw->samples = 4096 * 4;
1864         audio_pcm_hw_alloc_resources_out(hw);
1865
1866         audio_pcm_init_info (&hw->info, as);
1867
1868         cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1869
1870         if (hw->info.is_float) {
1871             hw->clip = mixeng_clip_float[hw->info.nchannels == 2];
1872         } else {
1873             hw->clip = mixeng_clip
1874                 [hw->info.nchannels == 2]
1875                 [hw->info.is_signed]
1876                 [hw->info.swap_endianness]
1877                 [audio_bits_to_index(hw->info.bits)];
1878         }
1879
1880         QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1881         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1882
1883         QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1884             audio_attach_capture (hw);
1885         }
1886         return cap;
1887     }
1888 }
1889
1890 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1891 {
1892     struct capture_callback *cb;
1893
1894     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1895         if (cb->opaque == cb_opaque) {
1896             cb->ops.destroy (cb_opaque);
1897             QLIST_REMOVE (cb, entries);
1898             g_free (cb);
1899
1900             if (!cap->cb_head.lh_first) {
1901                 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1902
1903                 while (sw) {
1904                     SWVoiceCap *sc = (SWVoiceCap *) sw;
1905 #ifdef DEBUG_CAPTURE
1906                     dolog ("freeing %s\n", sw->name);
1907 #endif
1908
1909                     sw1 = sw->entries.le_next;
1910                     if (sw->rate) {
1911                         st_rate_stop (sw->rate);
1912                         sw->rate = NULL;
1913                     }
1914                     QLIST_REMOVE (sw, entries);
1915                     QLIST_REMOVE (sc, entries);
1916                     g_free (sc);
1917                     sw = sw1;
1918                 }
1919                 QLIST_REMOVE (cap, entries);
1920                 g_free (cap->hw.mix_buf);
1921                 g_free (cap->buf);
1922                 g_free (cap);
1923             }
1924             return;
1925         }
1926     }
1927 }
1928
1929 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1930 {
1931     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1932     audio_set_volume_out(sw, &vol);
1933 }
1934
1935 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1936 {
1937     if (sw) {
1938         HWVoiceOut *hw = sw->hw;
1939
1940         sw->vol.mute = vol->mute;
1941         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1942         sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1943             255;
1944
1945         if (hw->pcm_ops->volume_out) {
1946             hw->pcm_ops->volume_out(hw, vol);
1947         }
1948     }
1949 }
1950
1951 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1952 {
1953     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1954     audio_set_volume_in(sw, &vol);
1955 }
1956
1957 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1958 {
1959     if (sw) {
1960         HWVoiceIn *hw = sw->hw;
1961
1962         sw->vol.mute = vol->mute;
1963         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1964         sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1965             255;
1966
1967         if (hw->pcm_ops->volume_in) {
1968             hw->pcm_ops->volume_in(hw, vol);
1969         }
1970     }
1971 }
1972
1973 void audio_create_pdos(Audiodev *dev)
1974 {
1975     switch (dev->driver) {
1976 #define CASE(DRIVER, driver, pdo_name)                              \
1977     case AUDIODEV_DRIVER_##DRIVER:                                  \
1978         if (!dev->u.driver.has_in) {                                \
1979             dev->u.driver.in = g_malloc0(                           \
1980                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1981             dev->u.driver.has_in = true;                            \
1982         }                                                           \
1983         if (!dev->u.driver.has_out) {                               \
1984             dev->u.driver.out = g_malloc0(                          \
1985                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1986             dev->u.driver.has_out = true;                           \
1987         }                                                           \
1988         break
1989
1990         CASE(NONE, none, );
1991         CASE(ALSA, alsa, Alsa);
1992         CASE(COREAUDIO, coreaudio, Coreaudio);
1993         CASE(DSOUND, dsound, );
1994         CASE(JACK, jack, Jack);
1995         CASE(OSS, oss, Oss);
1996         CASE(PA, pa, Pa);
1997         CASE(SDL, sdl, Sdl);
1998         CASE(SPICE, spice, );
1999         CASE(WAV, wav, );
2000
2001     case AUDIODEV_DRIVER__MAX:
2002         abort();
2003     };
2004 }
2005
2006 static void audio_validate_per_direction_opts(
2007     AudiodevPerDirectionOptions *pdo, Error **errp)
2008 {
2009     if (!pdo->has_mixing_engine) {
2010         pdo->has_mixing_engine = true;
2011         pdo->mixing_engine = true;
2012     }
2013     if (!pdo->has_fixed_settings) {
2014         pdo->has_fixed_settings = true;
2015         pdo->fixed_settings = pdo->mixing_engine;
2016     }
2017     if (!pdo->fixed_settings &&
2018         (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
2019         error_setg(errp,
2020                    "You can't use frequency, channels or format with fixed-settings=off");
2021         return;
2022     }
2023     if (!pdo->mixing_engine && pdo->fixed_settings) {
2024         error_setg(errp, "You can't use fixed-settings without mixeng");
2025         return;
2026     }
2027
2028     if (!pdo->has_frequency) {
2029         pdo->has_frequency = true;
2030         pdo->frequency = 44100;
2031     }
2032     if (!pdo->has_channels) {
2033         pdo->has_channels = true;
2034         pdo->channels = 2;
2035     }
2036     if (!pdo->has_voices) {
2037         pdo->has_voices = true;
2038         pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2039     }
2040     if (!pdo->has_format) {
2041         pdo->has_format = true;
2042         pdo->format = AUDIO_FORMAT_S16;
2043     }
2044 }
2045
2046 static void audio_validate_opts(Audiodev *dev, Error **errp)
2047 {
2048     Error *err = NULL;
2049
2050     audio_create_pdos(dev);
2051
2052     audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2053     if (err) {
2054         error_propagate(errp, err);
2055         return;
2056     }
2057
2058     audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2059     if (err) {
2060         error_propagate(errp, err);
2061         return;
2062     }
2063
2064     if (!dev->has_timer_period) {
2065         dev->has_timer_period = true;
2066         dev->timer_period = 10000; /* 100Hz -> 10ms */
2067     }
2068 }
2069
2070 void audio_parse_option(const char *opt)
2071 {
2072     AudiodevListEntry *e;
2073     Audiodev *dev = NULL;
2074
2075     Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2076     visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2077     visit_free(v);
2078
2079     audio_validate_opts(dev, &error_fatal);
2080
2081     e = g_malloc0(sizeof(AudiodevListEntry));
2082     e->dev = dev;
2083     QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2084 }
2085
2086 void audio_init_audiodevs(void)
2087 {
2088     AudiodevListEntry *e;
2089
2090     QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2091         audio_init(e->dev, NULL);
2092     }
2093 }
2094
2095 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2096 {
2097     return (audsettings) {
2098         .freq = pdo->frequency,
2099         .nchannels = pdo->channels,
2100         .fmt = pdo->format,
2101         .endianness = AUDIO_HOST_ENDIANNESS,
2102     };
2103 }
2104
2105 int audioformat_bytes_per_sample(AudioFormat fmt)
2106 {
2107     switch (fmt) {
2108     case AUDIO_FORMAT_U8:
2109     case AUDIO_FORMAT_S8:
2110         return 1;
2111
2112     case AUDIO_FORMAT_U16:
2113     case AUDIO_FORMAT_S16:
2114         return 2;
2115
2116     case AUDIO_FORMAT_U32:
2117     case AUDIO_FORMAT_S32:
2118     case AUDIO_FORMAT_F32:
2119         return 4;
2120
2121     case AUDIO_FORMAT__MAX:
2122         ;
2123     }
2124     abort();
2125 }
2126
2127
2128 /* frames = freq * usec / 1e6 */
2129 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2130                         audsettings *as, int def_usecs)
2131 {
2132     uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2133     return (as->freq * usecs + 500000) / 1000000;
2134 }
2135
2136 /* samples = channels * frames = channels * freq * usec / 1e6 */
2137 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2138                          audsettings *as, int def_usecs)
2139 {
2140     return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2141 }
2142
2143 /*
2144  * bytes = bytes_per_sample * samples =
2145  *     bytes_per_sample * channels * freq * usec / 1e6
2146  */
2147 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2148                        audsettings *as, int def_usecs)
2149 {
2150     return audio_buffer_samples(pdo, as, def_usecs) *
2151         audioformat_bytes_per_sample(as->fmt);
2152 }
2153
2154 AudioState *audio_state_by_name(const char *name)
2155 {
2156     AudioState *s;
2157     QTAILQ_FOREACH(s, &audio_states, list) {
2158         assert(s->dev);
2159         if (strcmp(name, s->dev->id) == 0) {
2160             return s;
2161         }
2162     }
2163     return NULL;
2164 }
2165
2166 const char *audio_get_id(QEMUSoundCard *card)
2167 {
2168     if (card->state) {
2169         assert(card->state->dev);
2170         return card->state->dev->id;
2171     } else {
2172         return "";
2173     }
2174 }
2175
2176 const char *audio_application_name(void)
2177 {
2178     const char *vm_name;
2179
2180     vm_name = qemu_get_vm_name();
2181     return vm_name ? vm_name : "qemu";
2182 }
2183
2184 void audio_rate_start(RateCtl *rate)
2185 {
2186     memset(rate, 0, sizeof(RateCtl));
2187     rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2188 }
2189
2190 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2191                             size_t bytes_avail)
2192 {
2193     int64_t now;
2194     int64_t ticks;
2195     int64_t bytes;
2196     int64_t samples;
2197     size_t ret;
2198
2199     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2200     ticks = now - rate->start_ticks;
2201     bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2202     samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2203     if (samples < 0 || samples > 65536) {
2204         AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2205         audio_rate_start(rate);
2206         samples = 0;
2207     }
2208
2209     ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2210     rate->bytes_sent += ret;
2211     return ret;
2212 }