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     }
 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     }
 588     else {
 589         return hw->conv_buf->size + rpos;
 590     }
 591 }
 592
 593 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 594 {
 595     HWVoiceIn *hw = sw->hw;
 596     size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 597     struct st_sample *src, *dst = sw->buf;
 598
 599     rpos = audio_pcm_sw_get_rpos_in(sw) % hw->conv_buf->size;
 600
 601     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 602     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 603         dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 604         return 0;
 605     }
 606
 607     samples = size / sw->info.bytes_per_frame;
 608     if (!live) {
 609         return 0;
 610     }
 611
 612     swlim = (live * sw->ratio) >> 32;
 613     swlim = MIN (swlim, samples);
 614
 615     while (swlim) {
 616         src = hw->conv_buf->samples + rpos;
 617         if (hw->conv_buf->pos > rpos) {
 618             isamp = hw->conv_buf->pos - rpos;
 619         } else {
 620             isamp = hw->conv_buf->size - rpos;
 621         }
 622
 623         if (!isamp) {
 624             break;
 625         }
 626         osamp = swlim;
 627
 628         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 629         swlim -= osamp;
 630         rpos = (rpos + isamp) % hw->conv_buf->size;
 631         dst += osamp;
 632         ret += osamp;
 633         total += isamp;
 634     }
 635
 636     if (hw->pcm_ops && !hw->pcm_ops->volume_in) {
 637         mixeng_volume (sw->buf, ret, &sw->vol);
 638     }
 639
 640     sw->clip (buf, sw->buf, ret);
 641     sw->total_hw_samples_acquired += total;
 642     return ret * sw->info.bytes_per_frame;
 643 }
 644
 645 /*
 646  * Hard voice (playback)
 647  */
 648 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 649 {
 650     SWVoiceOut *sw;
 651     size_t m = SIZE_MAX;
 652     int nb_live = 0;
 653
 654     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 655         if (sw->active || !sw->empty) {
 656             m = MIN (m, sw->total_hw_samples_mixed);
 657             nb_live += 1;
 658         }
 659     }
 660
 661     *nb_livep = nb_live;
 662     return m;
 663 }
 664
 665 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 666 {
 667     size_t smin;
 668     int nb_live1;
 669
 670     smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 671     if (nb_live) {
 672         *nb_live = nb_live1;
 673     }
 674
 675     if (nb_live1) {
 676         size_t live = smin;
 677
 678         if (audio_bug(__func__, live > hw->mix_buf->size)) {
 679             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 680             return 0;
 681         }
 682         return live;
 683     }
 684     return 0;
 685 }
 686
 687 /*
 688  * Soft voice (playback)
 689  */
 690 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 691 {
 692     size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 693     size_t ret = 0, pos = 0, total = 0;
 694
 695     if (!sw) {
 696         return size;
 697     }
 698
 699     hwsamples = sw->hw->mix_buf->size;
 700
 701     live = sw->total_hw_samples_mixed;
 702     if (audio_bug(__func__, live > hwsamples)) {
 703         dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 704         return 0;
 705     }
 706
 707     if (live == hwsamples) {
 708 #ifdef DEBUG_OUT
 709         dolog ("%s is full %d\n", sw->name, live);
 710 #endif
 711         return 0;
 712     }
 713
 714     wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 715     samples = size / sw->info.bytes_per_frame;
 716
 717     dead = hwsamples - live;
 718     swlim = ((int64_t) dead << 32) / sw->ratio;
 719     swlim = MIN (swlim, samples);
 720     if (swlim) {
 721         sw->conv (sw->buf, buf, swlim);
 722
 723         if (sw->hw->pcm_ops && !sw->hw->pcm_ops->volume_out) {
 724             mixeng_volume (sw->buf, swlim, &sw->vol);
 725         }
 726     }
 727
 728     while (swlim) {
 729         dead = hwsamples - live;
 730         left = hwsamples - wpos;
 731         blck = MIN (dead, left);
 732         if (!blck) {
 733             break;
 734         }
 735         isamp = swlim;
 736         osamp = blck;
 737         st_rate_flow_mix (
 738             sw->rate,
 739             sw->buf + pos,
 740             sw->hw->mix_buf->samples + wpos,
 741             &isamp,
 742             &osamp
 743             );
 744         ret += isamp;
 745         swlim -= isamp;
 746         pos += isamp;
 747         live += osamp;
 748         wpos = (wpos + osamp) % hwsamples;
 749         total += osamp;
 750     }
 751
 752     sw->total_hw_samples_mixed += total;
 753     sw->empty = sw->total_hw_samples_mixed == 0;
 754
 755 #ifdef DEBUG_OUT
 756     dolog (
 757         "%s: write size %zu ret %zu total sw %zu\n",
 758         SW_NAME (sw),
 759         size / sw->info.bytes_per_frame,
 760         ret,
 761         sw->total_hw_samples_mixed
 762         );
 763 #endif
 764
 765     return ret * sw->info.bytes_per_frame;
 766 }
 767
 768 #ifdef DEBUG_AUDIO
 769 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 770 {
 771     dolog("%s: bits %d, sign %d, float %d, freq %d, nchan %d\n",
 772           cap, info->bits, info->is_signed, info->is_float, info->freq,
 773           info->nchannels);
 774 }
 775 #endif
 776
 777 #define DAC
 778 #include "audio_template.h"
 779 #undef DAC
 780 #include "audio_template.h"
 781
 782 /*
 783  * Timer
 784  */
 785 static int audio_is_timer_needed(AudioState *s)
 786 {
 787     HWVoiceIn *hwi = NULL;
 788     HWVoiceOut *hwo = NULL;
 789
 790     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
 791         if (!hwo->poll_mode) return 1;
 792     }
 793     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
 794         if (!hwi->poll_mode) return 1;
 795     }
 796     return 0;
 797 }
 798
 799 static void audio_reset_timer (AudioState *s)
 800 {
 801     if (audio_is_timer_needed(s)) {
 802         timer_mod_anticipate_ns(s->ts,
 803             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
 804         if (!s->timer_running) {
 805             s->timer_running = true;
 806             s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 807             trace_audio_timer_start(s->period_ticks / SCALE_MS);
 808         }
 809     } else {
 810         timer_del(s->ts);
 811         if (s->timer_running) {
 812             s->timer_running = false;
 813             trace_audio_timer_stop();
 814         }
 815     }
 816 }
 817
 818 static void audio_timer (void *opaque)
 819 {
 820     int64_t now, diff;
 821     AudioState *s = opaque;
 822
 823     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 824     diff = now - s->timer_last;
 825     if (diff > s->period_ticks * 3 / 2) {
 826         trace_audio_timer_delayed(diff / SCALE_MS);
 827     }
 828     s->timer_last = now;
 829
 830     audio_run(s, "timer");
 831     audio_reset_timer(s);
 832 }
 833
 834 /*
 835  * Public API
 836  */
 837 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size)
 838 {
 839     HWVoiceOut *hw;
 840
 841     if (!sw) {
 842         /* XXX: Consider options */
 843         return size;
 844     }
 845     hw = sw->hw;
 846
 847     if (!hw->enabled) {
 848         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 849         return 0;
 850     }
 851
 852     if (audio_get_pdo_out(hw->s->dev)->mixing_engine) {
 853         return audio_pcm_sw_write(sw, buf, size);
 854     } else {
 855         return hw->pcm_ops->write(hw, buf, size);
 856     }
 857 }
 858
 859 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size)
 860 {
 861     HWVoiceIn *hw;
 862
 863     if (!sw) {
 864         /* XXX: Consider options */
 865         return size;
 866     }
 867     hw = sw->hw;
 868
 869     if (!hw->enabled) {
 870         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 871         return 0;
 872     }
 873
 874     if (audio_get_pdo_in(hw->s->dev)->mixing_engine) {
 875         return audio_pcm_sw_read(sw, buf, size);
 876     } else {
 877         return hw->pcm_ops->read(hw, buf, size);
 878     }
 879 }
 880
 881 int AUD_get_buffer_size_out(SWVoiceOut *sw)
 882 {
 883     return sw->hw->samples * sw->hw->info.bytes_per_frame;
 884 }
 885
 886 void AUD_set_active_out (SWVoiceOut *sw, int on)
 887 {
 888     HWVoiceOut *hw;
 889
 890     if (!sw) {
 891         return;
 892     }
 893
 894     hw = sw->hw;
 895     if (sw->active != on) {
 896         AudioState *s = sw->s;
 897         SWVoiceOut *temp_sw;
 898         SWVoiceCap *sc;
 899
 900         if (on) {
 901             hw->pending_disable = 0;
 902             if (!hw->enabled) {
 903                 hw->enabled = 1;
 904                 if (s->vm_running) {
 905                     if (hw->pcm_ops->enable_out) {
 906                         hw->pcm_ops->enable_out(hw, true);
 907                     }
 908                     audio_reset_timer (s);
 909                 }
 910             }
 911         }
 912         else {
 913             if (hw->enabled) {
 914                 int nb_active = 0;
 915
 916                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 917                      temp_sw = temp_sw->entries.le_next) {
 918                     nb_active += temp_sw->active != 0;
 919                 }
 920
 921                 hw->pending_disable = nb_active == 1;
 922             }
 923         }
 924
 925         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
 926             sc->sw.active = hw->enabled;
 927             if (hw->enabled) {
 928                 audio_capture_maybe_changed (sc->cap, 1);
 929             }
 930         }
 931         sw->active = on;
 932     }
 933 }
 934
 935 void AUD_set_active_in (SWVoiceIn *sw, int on)
 936 {
 937     HWVoiceIn *hw;
 938
 939     if (!sw) {
 940         return;
 941     }
 942
 943     hw = sw->hw;
 944     if (sw->active != on) {
 945         AudioState *s = sw->s;
 946         SWVoiceIn *temp_sw;
 947
 948         if (on) {
 949             if (!hw->enabled) {
 950                 hw->enabled = 1;
 951                 if (s->vm_running) {
 952                     if (hw->pcm_ops->enable_in) {
 953                         hw->pcm_ops->enable_in(hw, true);
 954                     }
 955                     audio_reset_timer (s);
 956                 }
 957             }
 958             sw->total_hw_samples_acquired = hw->total_samples_captured;
 959         }
 960         else {
 961             if (hw->enabled) {
 962                 int nb_active = 0;
 963
 964                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 965                      temp_sw = temp_sw->entries.le_next) {
 966                     nb_active += temp_sw->active != 0;
 967                 }
 968
 969                 if (nb_active == 1) {
 970                     hw->enabled = 0;
 971                     if (hw->pcm_ops->enable_in) {
 972                         hw->pcm_ops->enable_in(hw, false);
 973                     }
 974                 }
 975             }
 976         }
 977         sw->active = on;
 978     }
 979 }
 980
 981 static size_t audio_get_avail (SWVoiceIn *sw)
 982 {
 983     size_t live;
 984
 985     if (!sw) {
 986         return 0;
 987     }
 988
 989     live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
 990     if (audio_bug(__func__, live > sw->hw->conv_buf->size)) {
 991         dolog("live=%zu sw->hw->conv_buf->size=%zu\n", live,
 992               sw->hw->conv_buf->size);
 993         return 0;
 994     }
 995
 996     ldebug (
 997         "%s: get_avail live %d ret %" PRId64 "\n",
 998         SW_NAME (sw),
 999         live, (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame
1000         );
1001
1002     return (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame;
1003 }
1004
1005 static size_t audio_get_free(SWVoiceOut *sw)
1006 {
1007     size_t live, dead;
1008
1009     if (!sw) {
1010         return 0;
1011     }
1012
1013     live = sw->total_hw_samples_mixed;
1014
1015     if (audio_bug(__func__, live > sw->hw->mix_buf->size)) {
1016         dolog("live=%zu sw->hw->mix_buf->size=%zu\n", live,
1017               sw->hw->mix_buf->size);
1018         return 0;
1019     }
1020
1021     dead = sw->hw->mix_buf->size - live;
1022
1023 #ifdef DEBUG_OUT
1024     dolog ("%s: get_free live %d dead %d ret %" PRId64 "\n",
1025            SW_NAME (sw),
1026            live, dead, (((int64_t) dead << 32) / sw->ratio) *
1027            sw->info.bytes_per_frame);
1028 #endif
1029
1030     return (((int64_t) dead << 32) / sw->ratio) * sw->info.bytes_per_frame;
1031 }
1032
1033 static void audio_capture_mix_and_clear(HWVoiceOut *hw, size_t rpos,
1034                                         size_t samples)
1035 {
1036     size_t n;
1037
1038     if (hw->enabled) {
1039         SWVoiceCap *sc;
1040
1041         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1042             SWVoiceOut *sw = &sc->sw;
1043             int rpos2 = rpos;
1044
1045             n = samples;
1046             while (n) {
1047                 size_t till_end_of_hw = hw->mix_buf->size - rpos2;
1048                 size_t to_write = MIN(till_end_of_hw, n);
1049                 size_t bytes = to_write * hw->info.bytes_per_frame;
1050                 size_t written;
1051
1052                 sw->buf = hw->mix_buf->samples + rpos2;
1053                 written = audio_pcm_sw_write (sw, NULL, bytes);
1054                 if (written - bytes) {
1055                     dolog("Could not mix %zu bytes into a capture "
1056                           "buffer, mixed %zu\n",
1057                           bytes, written);
1058                     break;
1059                 }
1060                 n -= to_write;
1061                 rpos2 = (rpos2 + to_write) % hw->mix_buf->size;
1062             }
1063         }
1064     }
1065
1066     n = MIN(samples, hw->mix_buf->size - rpos);
1067     mixeng_clear(hw->mix_buf->samples + rpos, n);
1068     mixeng_clear(hw->mix_buf->samples, samples - n);
1069 }
1070
1071 static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
1072 {
1073     size_t clipped = 0;
1074
1075     while (live) {
1076         size_t size = 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, cleanup_required;
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         cleanup_required = 0;
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                 cleanup_required |= !sw->active && !sw->callback.fn;
1214             }
1215
1216             if (sw->active) {
1217                 free = audio_get_free (sw);
1218                 if (free > 0) {
1219                     sw->callback.fn (sw->callback.opaque, free);
1220                 }
1221             }
1222         }
1223
1224         if (cleanup_required) {
1225             SWVoiceOut *sw1;
1226
1227             sw = hw->sw_head.lh_first;
1228             while (sw) {
1229                 sw1 = sw->entries.le_next;
1230                 if (!sw->active && !sw->callback.fn) {
1231                     audio_close_out (sw);
1232                 }
1233                 sw = sw1;
1234             }
1235         }
1236     }
1237 }
1238
1239 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1240 {
1241     size_t conv = 0;
1242     STSampleBuffer *conv_buf = hw->conv_buf;
1243
1244     while (samples) {
1245         size_t proc;
1246         size_t size = samples * hw->info.bytes_per_frame;
1247         void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1248
1249         assert(size % hw->info.bytes_per_frame == 0);
1250         if (size == 0) {
1251             break;
1252         }
1253
1254         proc = MIN(size / hw->info.bytes_per_frame,
1255                    conv_buf->size - conv_buf->pos);
1256
1257         hw->conv(conv_buf->samples + conv_buf->pos, buf, proc);
1258         conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
1259
1260         samples -= proc;
1261         conv += proc;
1262         hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1263     }
1264
1265     return conv;
1266 }
1267
1268 static void audio_run_in (AudioState *s)
1269 {
1270     HWVoiceIn *hw = NULL;
1271
1272     if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1273         while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1274             /* there is exactly 1 sw for each hw with no mixeng */
1275             SWVoiceIn *sw = hw->sw_head.lh_first;
1276             if (sw->active) {
1277                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1278             }
1279         }
1280         return;
1281     }
1282
1283     while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1284         SWVoiceIn *sw;
1285         size_t captured = 0, min;
1286
1287         if (replay_mode != REPLAY_MODE_PLAY) {
1288             captured = audio_pcm_hw_run_in(
1289                 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1290         }
1291         replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1292                         hw->conv_buf->size);
1293
1294         min = audio_pcm_hw_find_min_in (hw);
1295         hw->total_samples_captured += captured - min;
1296         hw->ts_helper += captured;
1297
1298         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1299             sw->total_hw_samples_acquired -= min;
1300
1301             if (sw->active) {
1302                 size_t avail;
1303
1304                 avail = audio_get_avail (sw);
1305                 if (avail > 0) {
1306                     sw->callback.fn (sw->callback.opaque, avail);
1307                 }
1308             }
1309         }
1310     }
1311 }
1312
1313 static void audio_run_capture (AudioState *s)
1314 {
1315     CaptureVoiceOut *cap;
1316
1317     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1318         size_t live, rpos, captured;
1319         HWVoiceOut *hw = &cap->hw;
1320         SWVoiceOut *sw;
1321
1322         captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1323         rpos = hw->mix_buf->pos;
1324         while (live) {
1325             size_t left = hw->mix_buf->size - rpos;
1326             size_t to_capture = MIN(live, left);
1327             struct st_sample *src;
1328             struct capture_callback *cb;
1329
1330             src = hw->mix_buf->samples + rpos;
1331             hw->clip (cap->buf, src, to_capture);
1332             mixeng_clear (src, to_capture);
1333
1334             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1335                 cb->ops.capture (cb->opaque, cap->buf,
1336                                  to_capture * hw->info.bytes_per_frame);
1337             }
1338             rpos = (rpos + to_capture) % hw->mix_buf->size;
1339             live -= to_capture;
1340         }
1341         hw->mix_buf->pos = rpos;
1342
1343         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1344             if (!sw->active && sw->empty) {
1345                 continue;
1346             }
1347
1348             if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1349                 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1350                       captured, sw->total_hw_samples_mixed);
1351                 captured = sw->total_hw_samples_mixed;
1352             }
1353
1354             sw->total_hw_samples_mixed -= captured;
1355             sw->empty = sw->total_hw_samples_mixed == 0;
1356         }
1357     }
1358 }
1359
1360 void audio_run(AudioState *s, const char *msg)
1361 {
1362     audio_run_out(s);
1363     audio_run_in(s);
1364     audio_run_capture(s);
1365
1366 #ifdef DEBUG_POLL
1367     {
1368         static double prevtime;
1369         double currtime;
1370         struct timeval tv;
1371
1372         if (gettimeofday (&tv, NULL)) {
1373             perror ("audio_run: gettimeofday");
1374             return;
1375         }
1376
1377         currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1378         dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1379         prevtime = currtime;
1380     }
1381 #endif
1382 }
1383
1384 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1385 {
1386     ssize_t start;
1387
1388     if (unlikely(!hw->buf_emul)) {
1389         size_t calc_size = hw->conv_buf->size * hw->info.bytes_per_frame;
1390         hw->buf_emul = g_malloc(calc_size);
1391         hw->size_emul = calc_size;
1392         hw->pos_emul = hw->pending_emul = 0;
1393     }
1394
1395     while (hw->pending_emul < hw->size_emul) {
1396         size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1397                               hw->size_emul - hw->pending_emul);
1398         size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1399                                         read_len);
1400         hw->pending_emul += read;
1401         hw->pos_emul = (hw->pos_emul + read) % hw->size_emul;
1402         if (read < read_len) {
1403             break;
1404         }
1405     }
1406
1407     start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1408     if (start < 0) {
1409         start += hw->size_emul;
1410     }
1411     assert(start >= 0 && start < hw->size_emul);
1412
1413     *size = MIN(*size, hw->pending_emul);
1414     *size = MIN(*size, hw->size_emul - start);
1415     return hw->buf_emul + start;
1416 }
1417
1418 void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
1419 {
1420     assert(size <= hw->pending_emul);
1421     hw->pending_emul -= size;
1422 }
1423
1424 void audio_generic_run_buffer_out(HWVoiceOut *hw)
1425 {
1426     while (hw->pending_emul) {
1427         size_t write_len, written;
1428         ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1429
1430         if (start < 0) {
1431             start += hw->size_emul;
1432         }
1433         assert(start >= 0 && start < hw->size_emul);
1434
1435         write_len = MIN(hw->pending_emul, hw->size_emul - start);
1436
1437         written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1438         hw->pending_emul -= written;
1439
1440         if (written < write_len) {
1441             break;
1442         }
1443     }
1444 }
1445
1446 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1447 {
1448     if (unlikely(!hw->buf_emul)) {
1449         size_t calc_size = hw->mix_buf->size * hw->info.bytes_per_frame;
1450
1451         hw->buf_emul = g_malloc(calc_size);
1452         hw->size_emul = calc_size;
1453         hw->pos_emul = hw->pending_emul = 0;
1454     }
1455
1456     *size = MIN(hw->size_emul - hw->pending_emul,
1457                 hw->size_emul - hw->pos_emul);
1458     return hw->buf_emul + hw->pos_emul;
1459 }
1460
1461 size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
1462 {
1463     assert(buf == hw->buf_emul + hw->pos_emul &&
1464            size + hw->pending_emul <= hw->size_emul);
1465
1466     hw->pending_emul += size;
1467     hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
1468
1469     return size;
1470 }
1471
1472 size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size)
1473 {
1474     size_t total = 0;
1475
1476     while (total < size) {
1477         size_t dst_size = size - total;
1478         size_t copy_size, proc;
1479         void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1480
1481         if (dst_size == 0) {
1482             break;
1483         }
1484
1485         copy_size = MIN(size - total, dst_size);
1486         if (dst) {
1487             memcpy(dst, (char *)buf + total, copy_size);
1488         }
1489         proc = hw->pcm_ops->put_buffer_out(hw, dst, copy_size);
1490         total += proc;
1491
1492         if (proc == 0 || proc < copy_size) {
1493             break;
1494         }
1495     }
1496
1497     if (hw->pcm_ops->run_buffer_out) {
1498         hw->pcm_ops->run_buffer_out(hw);
1499     }
1500
1501     return total;
1502 }
1503
1504 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1505 {
1506     size_t total = 0;
1507
1508     while (total < size) {
1509         size_t src_size = size - total;
1510         void *src = hw->pcm_ops->get_buffer_in(hw, &src_size);
1511
1512         if (src_size == 0) {
1513             break;
1514         }
1515
1516         memcpy((char *)buf + total, src, src_size);
1517         hw->pcm_ops->put_buffer_in(hw, src, src_size);
1518         total += src_size;
1519     }
1520
1521     return total;
1522 }
1523
1524 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1525                              bool msg, Audiodev *dev)
1526 {
1527     s->drv_opaque = drv->init(dev);
1528
1529     if (s->drv_opaque) {
1530         if (!drv->pcm_ops->get_buffer_in) {
1531             drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1532             drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1533         }
1534         if (!drv->pcm_ops->get_buffer_out) {
1535             drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1536             drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1537         }
1538
1539         audio_init_nb_voices_out(s, drv);
1540         audio_init_nb_voices_in(s, drv);
1541         s->drv = drv;
1542         return 0;
1543     }
1544     else {
1545         if (msg) {
1546             dolog("Could not init `%s' audio driver\n", drv->name);
1547         }
1548         return -1;
1549     }
1550 }
1551
1552 static void audio_vm_change_state_handler (void *opaque, int running,
1553                                            RunState state)
1554 {
1555     AudioState *s = opaque;
1556     HWVoiceOut *hwo = NULL;
1557     HWVoiceIn *hwi = NULL;
1558
1559     s->vm_running = running;
1560     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1561         if (hwo->pcm_ops->enable_out) {
1562             hwo->pcm_ops->enable_out(hwo, running);
1563         }
1564     }
1565
1566     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1567         if (hwi->pcm_ops->enable_in) {
1568             hwi->pcm_ops->enable_in(hwi, running);
1569         }
1570     }
1571     audio_reset_timer (s);
1572 }
1573
1574 static void free_audio_state(AudioState *s)
1575 {
1576     HWVoiceOut *hwo, *hwon;
1577     HWVoiceIn *hwi, *hwin;
1578
1579     QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1580         SWVoiceCap *sc;
1581
1582         if (hwo->enabled && hwo->pcm_ops->enable_out) {
1583             hwo->pcm_ops->enable_out(hwo, false);
1584         }
1585         hwo->pcm_ops->fini_out (hwo);
1586
1587         for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1588             CaptureVoiceOut *cap = sc->cap;
1589             struct capture_callback *cb;
1590
1591             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1592                 cb->ops.destroy (cb->opaque);
1593             }
1594         }
1595         QLIST_REMOVE(hwo, entries);
1596     }
1597
1598     QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1599         if (hwi->enabled && hwi->pcm_ops->enable_in) {
1600             hwi->pcm_ops->enable_in(hwi, false);
1601         }
1602         hwi->pcm_ops->fini_in (hwi);
1603         QLIST_REMOVE(hwi, entries);
1604     }
1605
1606     if (s->drv) {
1607         s->drv->fini (s->drv_opaque);
1608         s->drv = NULL;
1609     }
1610
1611     if (s->dev) {
1612         qapi_free_Audiodev(s->dev);
1613         s->dev = NULL;
1614     }
1615
1616     if (s->ts) {
1617         timer_free(s->ts);
1618         s->ts = NULL;
1619     }
1620
1621     g_free(s);
1622 }
1623
1624 void audio_cleanup(void)
1625 {
1626     while (!QTAILQ_EMPTY(&audio_states)) {
1627         AudioState *s = QTAILQ_FIRST(&audio_states);
1628         QTAILQ_REMOVE(&audio_states, s, list);
1629         free_audio_state(s);
1630     }
1631 }
1632
1633 static const VMStateDescription vmstate_audio = {
1634     .name = "audio",
1635     .version_id = 1,
1636     .minimum_version_id = 1,
1637     .fields = (VMStateField[]) {
1638         VMSTATE_END_OF_LIST()
1639     }
1640 };
1641
1642 static void audio_validate_opts(Audiodev *dev, Error **errp);
1643
1644 static AudiodevListEntry *audiodev_find(
1645     AudiodevListHead *head, const char *drvname)
1646 {
1647     AudiodevListEntry *e;
1648     QSIMPLEQ_FOREACH(e, head, next) {
1649         if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1650             return e;
1651         }
1652     }
1653
1654     return NULL;
1655 }
1656
1657 /*
1658  * if we have dev, this function was called because of an -audiodev argument =>
1659  *   initialize a new state with it
1660  * if dev == NULL => legacy implicit initialization, return the already created
1661  *   state or create a new one
1662  */
1663 static AudioState *audio_init(Audiodev *dev, const char *name)
1664 {
1665     static bool atexit_registered;
1666     size_t i;
1667     int done = 0;
1668     const char *drvname = NULL;
1669     VMChangeStateEntry *e;
1670     AudioState *s;
1671     struct audio_driver *driver;
1672     /* silence gcc warning about uninitialized variable */
1673     AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1674
1675     if (using_spice) {
1676         /*
1677          * When using spice allow the spice audio driver being picked
1678          * as default.
1679          *
1680          * Temporary hack.  Using audio devices without explicit
1681          * audiodev= property is already deprecated.  Same goes for
1682          * the -soundhw switch.  Once this support gets finally
1683          * removed we can also drop the concept of a default audio
1684          * backend and this can go away.
1685          */
1686         driver = audio_driver_lookup("spice");
1687         if (driver) {
1688             driver->can_be_default = 1;
1689         }
1690     }
1691
1692     if (dev) {
1693         /* -audiodev option */
1694         legacy_config = false;
1695         drvname = AudiodevDriver_str(dev->driver);
1696     } else if (!QTAILQ_EMPTY(&audio_states)) {
1697         if (!legacy_config) {
1698             dolog("Device %s: audiodev default parameter is deprecated, please "
1699                   "specify audiodev=%s\n", name,
1700                   QTAILQ_FIRST(&audio_states)->dev->id);
1701         }
1702         return QTAILQ_FIRST(&audio_states);
1703     } else {
1704         /* legacy implicit initialization */
1705         head = audio_handle_legacy_opts();
1706         /*
1707          * In case of legacy initialization, all Audiodevs in the list will have
1708          * the same configuration (except the driver), so it doesn't matter which
1709          * one we chose.  We need an Audiodev to set up AudioState before we can
1710          * init a driver.  Also note that dev at this point is still in the
1711          * list.
1712          */
1713         dev = QSIMPLEQ_FIRST(&head)->dev;
1714         audio_validate_opts(dev, &error_abort);
1715     }
1716
1717     s = g_malloc0(sizeof(AudioState));
1718     s->dev = dev;
1719
1720     QLIST_INIT (&s->hw_head_out);
1721     QLIST_INIT (&s->hw_head_in);
1722     QLIST_INIT (&s->cap_head);
1723     if (!atexit_registered) {
1724         atexit(audio_cleanup);
1725         atexit_registered = true;
1726     }
1727     QTAILQ_INSERT_TAIL(&audio_states, s, list);
1728
1729     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1730
1731     s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1732     s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1733
1734     if (s->nb_hw_voices_out <= 0) {
1735         dolog ("Bogus number of playback voices %d, setting to 1\n",
1736                s->nb_hw_voices_out);
1737         s->nb_hw_voices_out = 1;
1738     }
1739
1740     if (s->nb_hw_voices_in <= 0) {
1741         dolog ("Bogus number of capture voices %d, setting to 0\n",
1742                s->nb_hw_voices_in);
1743         s->nb_hw_voices_in = 0;
1744     }
1745
1746     if (drvname) {
1747         driver = audio_driver_lookup(drvname);
1748         if (driver) {
1749             done = !audio_driver_init(s, driver, true, dev);
1750         } else {
1751             dolog ("Unknown audio driver `%s'\n", drvname);
1752         }
1753     } else {
1754         for (i = 0; audio_prio_list[i]; i++) {
1755             AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1756             driver = audio_driver_lookup(audio_prio_list[i]);
1757
1758             if (e && driver) {
1759                 s->dev = dev = e->dev;
1760                 audio_validate_opts(dev, &error_abort);
1761                 done = !audio_driver_init(s, driver, false, dev);
1762                 if (done) {
1763                     e->dev = NULL;
1764                     break;
1765                 }
1766             }
1767         }
1768     }
1769     audio_free_audiodev_list(&head);
1770
1771     if (!done) {
1772         driver = audio_driver_lookup("none");
1773         done = !audio_driver_init(s, driver, false, dev);
1774         assert(done);
1775         dolog("warning: Using timer based audio emulation\n");
1776     }
1777
1778     if (dev->timer_period <= 0) {
1779         s->period_ticks = 1;
1780     } else {
1781         s->period_ticks = dev->timer_period * (int64_t)SCALE_US;
1782     }
1783
1784     e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1785     if (!e) {
1786         dolog ("warning: Could not register change state handler\n"
1787                "(Audio can continue looping even after stopping the VM)\n");
1788     }
1789
1790     QLIST_INIT (&s->card_head);
1791     vmstate_register (NULL, 0, &vmstate_audio, s);
1792     return s;
1793 }
1794
1795 void audio_free_audiodev_list(AudiodevListHead *head)
1796 {
1797     AudiodevListEntry *e;
1798     while ((e = QSIMPLEQ_FIRST(head))) {
1799         QSIMPLEQ_REMOVE_HEAD(head, next);
1800         qapi_free_Audiodev(e->dev);
1801         g_free(e);
1802     }
1803 }
1804
1805 void AUD_register_card (const char *name, QEMUSoundCard *card)
1806 {
1807     if (!card->state) {
1808         card->state = audio_init(NULL, name);
1809     }
1810
1811     card->name = g_strdup (name);
1812     memset (&card->entries, 0, sizeof (card->entries));
1813     QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1814 }
1815
1816 void AUD_remove_card (QEMUSoundCard *card)
1817 {
1818     QLIST_REMOVE (card, entries);
1819     g_free (card->name);
1820 }
1821
1822
1823 CaptureVoiceOut *AUD_add_capture(
1824     AudioState *s,
1825     struct audsettings *as,
1826     struct audio_capture_ops *ops,
1827     void *cb_opaque
1828     )
1829 {
1830     CaptureVoiceOut *cap;
1831     struct capture_callback *cb;
1832
1833     if (!s) {
1834         if (!legacy_config) {
1835             dolog("Capturing without setting an audiodev is deprecated\n");
1836         }
1837         s = audio_init(NULL, NULL);
1838     }
1839
1840     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1841         dolog("Can't capture with mixeng disabled\n");
1842         return NULL;
1843     }
1844
1845     if (audio_validate_settings (as)) {
1846         dolog ("Invalid settings were passed when trying to add capture\n");
1847         audio_print_settings (as);
1848         return NULL;
1849     }
1850
1851     cb = g_malloc0(sizeof(*cb));
1852     cb->ops = *ops;
1853     cb->opaque = cb_opaque;
1854
1855     cap = audio_pcm_capture_find_specific(s, as);
1856     if (cap) {
1857         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1858         return cap;
1859     }
1860     else {
1861         HWVoiceOut *hw;
1862         CaptureVoiceOut *cap;
1863
1864         cap = g_malloc0(sizeof(*cap));
1865
1866         hw = &cap->hw;
1867         hw->s = s;
1868         QLIST_INIT (&hw->sw_head);
1869         QLIST_INIT (&cap->cb_head);
1870
1871         /* XXX find a more elegant way */
1872         hw->samples = 4096 * 4;
1873         audio_pcm_hw_alloc_resources_out(hw);
1874
1875         audio_pcm_init_info (&hw->info, as);
1876
1877         cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1878
1879         if (hw->info.is_float) {
1880             hw->clip = mixeng_clip_float[hw->info.nchannels == 2];
1881         } else {
1882             hw->clip = mixeng_clip
1883                 [hw->info.nchannels == 2]
1884                 [hw->info.is_signed]
1885                 [hw->info.swap_endianness]
1886                 [audio_bits_to_index(hw->info.bits)];
1887         }
1888
1889         QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1890         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1891
1892         QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1893             audio_attach_capture (hw);
1894         }
1895         return cap;
1896     }
1897 }
1898
1899 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1900 {
1901     struct capture_callback *cb;
1902
1903     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1904         if (cb->opaque == cb_opaque) {
1905             cb->ops.destroy (cb_opaque);
1906             QLIST_REMOVE (cb, entries);
1907             g_free (cb);
1908
1909             if (!cap->cb_head.lh_first) {
1910                 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1911
1912                 while (sw) {
1913                     SWVoiceCap *sc = (SWVoiceCap *) sw;
1914 #ifdef DEBUG_CAPTURE
1915                     dolog ("freeing %s\n", sw->name);
1916 #endif
1917
1918                     sw1 = sw->entries.le_next;
1919                     if (sw->rate) {
1920                         st_rate_stop (sw->rate);
1921                         sw->rate = NULL;
1922                     }
1923                     QLIST_REMOVE (sw, entries);
1924                     QLIST_REMOVE (sc, entries);
1925                     g_free (sc);
1926                     sw = sw1;
1927                 }
1928                 QLIST_REMOVE (cap, entries);
1929                 g_free (cap->hw.mix_buf);
1930                 g_free (cap->buf);
1931                 g_free (cap);
1932             }
1933             return;
1934         }
1935     }
1936 }
1937
1938 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1939 {
1940     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1941     audio_set_volume_out(sw, &vol);
1942 }
1943
1944 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1945 {
1946     if (sw) {
1947         HWVoiceOut *hw = sw->hw;
1948
1949         sw->vol.mute = vol->mute;
1950         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1951         sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1952             255;
1953
1954         if (hw->pcm_ops->volume_out) {
1955             hw->pcm_ops->volume_out(hw, vol);
1956         }
1957     }
1958 }
1959
1960 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1961 {
1962     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1963     audio_set_volume_in(sw, &vol);
1964 }
1965
1966 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1967 {
1968     if (sw) {
1969         HWVoiceIn *hw = sw->hw;
1970
1971         sw->vol.mute = vol->mute;
1972         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1973         sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1974             255;
1975
1976         if (hw->pcm_ops->volume_in) {
1977             hw->pcm_ops->volume_in(hw, vol);
1978         }
1979     }
1980 }
1981
1982 void audio_create_pdos(Audiodev *dev)
1983 {
1984     switch (dev->driver) {
1985 #define CASE(DRIVER, driver, pdo_name)                              \
1986     case AUDIODEV_DRIVER_##DRIVER:                                  \
1987         if (!dev->u.driver.has_in) {                                \
1988             dev->u.driver.in = g_malloc0(                           \
1989                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1990             dev->u.driver.has_in = true;                            \
1991         }                                                           \
1992         if (!dev->u.driver.has_out) {                               \
1993             dev->u.driver.out = g_malloc0(                          \
1994                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1995             dev->u.driver.has_out = true;                           \
1996         }                                                           \
1997         break
1998
1999         CASE(NONE, none, );
2000         CASE(ALSA, alsa, Alsa);
2001         CASE(COREAUDIO, coreaudio, Coreaudio);
2002         CASE(DSOUND, dsound, );
2003         CASE(JACK, jack, Jack);
2004         CASE(OSS, oss, Oss);
2005         CASE(PA, pa, Pa);
2006         CASE(SDL, sdl, );
2007         CASE(SPICE, spice, );
2008         CASE(WAV, wav, );
2009
2010     case AUDIODEV_DRIVER__MAX:
2011         abort();
2012     };
2013 }
2014
2015 static void audio_validate_per_direction_opts(
2016     AudiodevPerDirectionOptions *pdo, Error **errp)
2017 {
2018     if (!pdo->has_mixing_engine) {
2019         pdo->has_mixing_engine = true;
2020         pdo->mixing_engine = true;
2021     }
2022     if (!pdo->has_fixed_settings) {
2023         pdo->has_fixed_settings = true;
2024         pdo->fixed_settings = pdo->mixing_engine;
2025     }
2026     if (!pdo->fixed_settings &&
2027         (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
2028         error_setg(errp,
2029                    "You can't use frequency, channels or format with fixed-settings=off");
2030         return;
2031     }
2032     if (!pdo->mixing_engine && pdo->fixed_settings) {
2033         error_setg(errp, "You can't use fixed-settings without mixeng");
2034         return;
2035     }
2036
2037     if (!pdo->has_frequency) {
2038         pdo->has_frequency = true;
2039         pdo->frequency = 44100;
2040     }
2041     if (!pdo->has_channels) {
2042         pdo->has_channels = true;
2043         pdo->channels = 2;
2044     }
2045     if (!pdo->has_voices) {
2046         pdo->has_voices = true;
2047         pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2048     }
2049     if (!pdo->has_format) {
2050         pdo->has_format = true;
2051         pdo->format = AUDIO_FORMAT_S16;
2052     }
2053 }
2054
2055 static void audio_validate_opts(Audiodev *dev, Error **errp)
2056 {
2057     Error *err = NULL;
2058
2059     audio_create_pdos(dev);
2060
2061     audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2062     if (err) {
2063         error_propagate(errp, err);
2064         return;
2065     }
2066
2067     audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2068     if (err) {
2069         error_propagate(errp, err);
2070         return;
2071     }
2072
2073     if (!dev->has_timer_period) {
2074         dev->has_timer_period = true;
2075         dev->timer_period = 10000; /* 100Hz -> 10ms */
2076     }
2077 }
2078
2079 void audio_parse_option(const char *opt)
2080 {
2081     AudiodevListEntry *e;
2082     Audiodev *dev = NULL;
2083
2084     Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2085     visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2086     visit_free(v);
2087
2088     audio_validate_opts(dev, &error_fatal);
2089
2090     e = g_malloc0(sizeof(AudiodevListEntry));
2091     e->dev = dev;
2092     QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2093 }
2094
2095 void audio_init_audiodevs(void)
2096 {
2097     AudiodevListEntry *e;
2098
2099     QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2100         audio_init(e->dev, NULL);
2101     }
2102 }
2103
2104 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2105 {
2106     return (audsettings) {
2107         .freq = pdo->frequency,
2108         .nchannels = pdo->channels,
2109         .fmt = pdo->format,
2110         .endianness = AUDIO_HOST_ENDIANNESS,
2111     };
2112 }
2113
2114 int audioformat_bytes_per_sample(AudioFormat fmt)
2115 {
2116     switch (fmt) {
2117     case AUDIO_FORMAT_U8:
2118     case AUDIO_FORMAT_S8:
2119         return 1;
2120
2121     case AUDIO_FORMAT_U16:
2122     case AUDIO_FORMAT_S16:
2123         return 2;
2124
2125     case AUDIO_FORMAT_U32:
2126     case AUDIO_FORMAT_S32:
2127     case AUDIO_FORMAT_F32:
2128         return 4;
2129
2130     case AUDIO_FORMAT__MAX:
2131         ;
2132     }
2133     abort();
2134 }
2135
2136
2137 /* frames = freq * usec / 1e6 */
2138 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2139                         audsettings *as, int def_usecs)
2140 {
2141     uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2142     return (as->freq * usecs + 500000) / 1000000;
2143 }
2144
2145 /* samples = channels * frames = channels * freq * usec / 1e6 */
2146 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2147                          audsettings *as, int def_usecs)
2148 {
2149     return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2150 }
2151
2152 /*
2153  * bytes = bytes_per_sample * samples =
2154  *     bytes_per_sample * channels * freq * usec / 1e6
2155  */
2156 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2157                        audsettings *as, int def_usecs)
2158 {
2159     return audio_buffer_samples(pdo, as, def_usecs) *
2160         audioformat_bytes_per_sample(as->fmt);
2161 }
2162
2163 AudioState *audio_state_by_name(const char *name)
2164 {
2165     AudioState *s;
2166     QTAILQ_FOREACH(s, &audio_states, list) {
2167         assert(s->dev);
2168         if (strcmp(name, s->dev->id) == 0) {
2169             return s;
2170         }
2171     }
2172     return NULL;
2173 }
2174
2175 const char *audio_get_id(QEMUSoundCard *card)
2176 {
2177     if (card->state) {
2178         assert(card->state->dev);
2179         return card->state->dev->id;
2180     } else {
2181         return "";
2182     }
2183 }
2184
2185 void audio_rate_start(RateCtl *rate)
2186 {
2187     memset(rate, 0, sizeof(RateCtl));
2188     rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2189 }
2190
2191 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2192                             size_t bytes_avail)
2193 {
2194     int64_t now;
2195     int64_t ticks;
2196     int64_t bytes;
2197     int64_t samples;
2198     size_t ret;
2199
2200     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2201     ticks = now - rate->start_ticks;
2202     bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2203     samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2204     if (samples < 0 || samples > 65536) {
2205         AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2206         audio_rate_start(rate);
2207         samples = 0;
2208     }
2209
2210     ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2211     rate->bytes_sent += ret;
2212     return ret;
2213 }