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     }
 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         abort();
 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         abort();
 159     }
 160
 161     return g_malloc0 (len);
 162 }
 163
 164 void AUD_vlog (const char *cap, const char *fmt, va_list ap)
 165 {
 166     if (cap) {
 167         fprintf(stderr, "%s: ", cap);
 168     }
 169
 170     vfprintf(stderr, fmt, ap);
 171 }
 172
 173 void AUD_log (const char *cap, const char *fmt, ...)
 174 {
 175     va_list ap;
 176
 177     va_start (ap, fmt);
 178     AUD_vlog (cap, fmt, ap);
 179     va_end (ap);
 180 }
 181
 182 static void audio_print_settings (struct audsettings *as)
 183 {
 184     dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels);
 185
 186     switch (as->fmt) {
 187     case AUDIO_FORMAT_S8:
 188         AUD_log (NULL, "S8");
 189         break;
 190     case AUDIO_FORMAT_U8:
 191         AUD_log (NULL, "U8");
 192         break;
 193     case AUDIO_FORMAT_S16:
 194         AUD_log (NULL, "S16");
 195         break;
 196     case AUDIO_FORMAT_U16:
 197         AUD_log (NULL, "U16");
 198         break;
 199     case AUDIO_FORMAT_S32:
 200         AUD_log (NULL, "S32");
 201         break;
 202     case AUDIO_FORMAT_U32:
 203         AUD_log (NULL, "U32");
 204         break;
 205     case AUDIO_FORMAT_F32:
 206         AUD_log (NULL, "F32");
 207         break;
 208     default:
 209         AUD_log (NULL, "invalid(%d)", as->fmt);
 210         break;
 211     }
 212
 213     AUD_log (NULL, " endianness=");
 214     switch (as->endianness) {
 215     case 0:
 216         AUD_log (NULL, "little");
 217         break;
 218     case 1:
 219         AUD_log (NULL, "big");
 220         break;
 221     default:
 222         AUD_log (NULL, "invalid");
 223         break;
 224     }
 225     AUD_log (NULL, "\n");
 226 }
 227
 228 static int audio_validate_settings (struct audsettings *as)
 229 {
 230     int invalid;
 231
 232     invalid = as->nchannels < 1;
 233     invalid |= as->endianness != 0 && as->endianness != 1;
 234
 235     switch (as->fmt) {
 236     case AUDIO_FORMAT_S8:
 237     case AUDIO_FORMAT_U8:
 238     case AUDIO_FORMAT_S16:
 239     case AUDIO_FORMAT_U16:
 240     case AUDIO_FORMAT_S32:
 241     case AUDIO_FORMAT_U32:
 242     case AUDIO_FORMAT_F32:
 243         break;
 244     default:
 245         invalid = 1;
 246         break;
 247     }
 248
 249     invalid |= as->freq <= 0;
 250     return invalid ? -1 : 0;
 251 }
 252
 253 static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as)
 254 {
 255     int bits = 8;
 256     bool is_signed = false, is_float = false;
 257
 258     switch (as->fmt) {
 259     case AUDIO_FORMAT_S8:
 260         is_signed = true;
 261         /* fall through */
 262     case AUDIO_FORMAT_U8:
 263         break;
 264
 265     case AUDIO_FORMAT_S16:
 266         is_signed = true;
 267         /* fall through */
 268     case AUDIO_FORMAT_U16:
 269         bits = 16;
 270         break;
 271
 272     case AUDIO_FORMAT_F32:
 273         is_float = true;
 274         /* fall through */
 275     case AUDIO_FORMAT_S32:
 276         is_signed = true;
 277         /* fall through */
 278     case AUDIO_FORMAT_U32:
 279         bits = 32;
 280         break;
 281
 282     default:
 283         abort();
 284     }
 285     return info->freq == as->freq
 286         && info->nchannels == as->nchannels
 287         && info->is_signed == is_signed
 288         && info->is_float == is_float
 289         && info->bits == bits
 290         && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS);
 291 }
 292
 293 void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as)
 294 {
 295     int bits = 8, mul;
 296     bool is_signed = false, is_float = false;
 297
 298     switch (as->fmt) {
 299     case AUDIO_FORMAT_S8:
 300         is_signed = true;
 301         /* fall through */
 302     case AUDIO_FORMAT_U8:
 303         mul = 1;
 304         break;
 305
 306     case AUDIO_FORMAT_S16:
 307         is_signed = true;
 308         /* fall through */
 309     case AUDIO_FORMAT_U16:
 310         bits = 16;
 311         mul = 2;
 312         break;
 313
 314     case AUDIO_FORMAT_F32:
 315         is_float = true;
 316         /* fall through */
 317     case AUDIO_FORMAT_S32:
 318         is_signed = true;
 319         /* fall through */
 320     case AUDIO_FORMAT_U32:
 321         bits = 32;
 322         mul = 4;
 323         break;
 324
 325     default:
 326         abort();
 327     }
 328
 329     info->freq = as->freq;
 330     info->bits = bits;
 331     info->is_signed = is_signed;
 332     info->is_float = is_float;
 333     info->nchannels = as->nchannels;
 334     info->bytes_per_frame = as->nchannels * mul;
 335     info->bytes_per_second = info->freq * info->bytes_per_frame;
 336     info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS);
 337 }
 338
 339 void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len)
 340 {
 341     if (!len) {
 342         return;
 343     }
 344
 345     if (info->is_signed || info->is_float) {
 346         memset(buf, 0x00, len * info->bytes_per_frame);
 347     } else {
 348         switch (info->bits) {
 349         case 8:
 350             memset(buf, 0x80, len * info->bytes_per_frame);
 351             break;
 352
 353         case 16:
 354             {
 355                 int i;
 356                 uint16_t *p = buf;
 357                 short s = INT16_MAX;
 358
 359                 if (info->swap_endianness) {
 360                     s = bswap16 (s);
 361                 }
 362
 363                 for (i = 0; i < len * info->nchannels; i++) {
 364                     p[i] = s;
 365                 }
 366             }
 367             break;
 368
 369         case 32:
 370             {
 371                 int i;
 372                 uint32_t *p = buf;
 373                 int32_t s = INT32_MAX;
 374
 375                 if (info->swap_endianness) {
 376                     s = bswap32 (s);
 377                 }
 378
 379                 for (i = 0; i < len * info->nchannels; i++) {
 380                     p[i] = s;
 381                 }
 382             }
 383             break;
 384
 385         default:
 386             AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n",
 387                      info->bits);
 388             break;
 389         }
 390     }
 391 }
 392
 393 /*
 394  * Capture
 395  */
 396 static void noop_conv (struct st_sample *dst, const void *src, int samples)
 397 {
 398     (void) src;
 399     (void) dst;
 400     (void) samples;
 401 }
 402
 403 static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
 404                                                         struct audsettings *as)
 405 {
 406     CaptureVoiceOut *cap;
 407
 408     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 409         if (audio_pcm_info_eq (&cap->hw.info, as)) {
 410             return cap;
 411         }
 412     }
 413     return NULL;
 414 }
 415
 416 static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd)
 417 {
 418     struct capture_callback *cb;
 419
 420 #ifdef DEBUG_CAPTURE
 421     dolog ("notification %d sent\n", cmd);
 422 #endif
 423     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
 424         cb->ops.notify (cb->opaque, cmd);
 425     }
 426 }
 427
 428 static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled)
 429 {
 430     if (cap->hw.enabled != enabled) {
 431         audcnotification_e cmd;
 432         cap->hw.enabled = enabled;
 433         cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE;
 434         audio_notify_capture (cap, cmd);
 435     }
 436 }
 437
 438 static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap)
 439 {
 440     HWVoiceOut *hw = &cap->hw;
 441     SWVoiceOut *sw;
 442     int enabled = 0;
 443
 444     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 445         if (sw->active) {
 446             enabled = 1;
 447             break;
 448         }
 449     }
 450     audio_capture_maybe_changed (cap, enabled);
 451 }
 452
 453 static void audio_detach_capture (HWVoiceOut *hw)
 454 {
 455     SWVoiceCap *sc = hw->cap_head.lh_first;
 456
 457     while (sc) {
 458         SWVoiceCap *sc1 = sc->entries.le_next;
 459         SWVoiceOut *sw = &sc->sw;
 460         CaptureVoiceOut *cap = sc->cap;
 461         int was_active = sw->active;
 462
 463         if (sw->rate) {
 464             st_rate_stop (sw->rate);
 465             sw->rate = NULL;
 466         }
 467
 468         QLIST_REMOVE (sw, entries);
 469         QLIST_REMOVE (sc, entries);
 470         g_free (sc);
 471         if (was_active) {
 472             /* We have removed soft voice from the capture:
 473                this might have changed the overall status of the capture
 474                since this might have been the only active voice */
 475             audio_recalc_and_notify_capture (cap);
 476         }
 477         sc = sc1;
 478     }
 479 }
 480
 481 static int audio_attach_capture (HWVoiceOut *hw)
 482 {
 483     AudioState *s = hw->s;
 484     CaptureVoiceOut *cap;
 485
 486     audio_detach_capture (hw);
 487     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 488         SWVoiceCap *sc;
 489         SWVoiceOut *sw;
 490         HWVoiceOut *hw_cap = &cap->hw;
 491
 492         sc = g_malloc0(sizeof(*sc));
 493
 494         sc->cap = cap;
 495         sw = &sc->sw;
 496         sw->hw = hw_cap;
 497         sw->info = hw->info;
 498         sw->empty = 1;
 499         sw->active = hw->enabled;
 500         sw->conv = noop_conv;
 501         sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
 502         sw->vol = nominal_volume;
 503         sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
 504         if (!sw->rate) {
 505             dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw));
 506             g_free (sw);
 507             return -1;
 508         }
 509         QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
 510         QLIST_INSERT_HEAD (&hw->cap_head, sc, entries);
 511 #ifdef DEBUG_CAPTURE
 512         sw->name = g_strdup_printf ("for %p %d,%d,%d",
 513                                     hw, sw->info.freq, sw->info.bits,
 514                                     sw->info.nchannels);
 515         dolog ("Added %s active = %d\n", sw->name, sw->active);
 516 #endif
 517         if (sw->active) {
 518             audio_capture_maybe_changed (cap, 1);
 519         }
 520     }
 521     return 0;
 522 }
 523
 524 /*
 525  * Hard voice (capture)
 526  */
 527 static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 528 {
 529     SWVoiceIn *sw;
 530     size_t m = hw->total_samples_captured;
 531
 532     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 533         if (sw->active) {
 534             m = MIN (m, sw->total_hw_samples_acquired);
 535         }
 536     }
 537     return m;
 538 }
 539
 540 static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw)
 541 {
 542     size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 543     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 544         dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 545         abort();
 546     }
 547     return live;
 548 }
 549
 550 static size_t audio_pcm_hw_conv_in(HWVoiceIn *hw, void *pcm_buf, size_t samples)
 551 {
 552     size_t conv = 0;
 553     STSampleBuffer *conv_buf = hw->conv_buf;
 554
 555     while (samples) {
 556         uint8_t *src = advance(pcm_buf, conv * hw->info.bytes_per_frame);
 557         size_t proc = MIN(samples, conv_buf->size - conv_buf->pos);
 558
 559         hw->conv(conv_buf->samples + conv_buf->pos, src, proc);
 560         conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
 561         samples -= proc;
 562         conv += proc;
 563     }
 564
 565     return conv;
 566 }
 567
 568 /*
 569  * Soft voice (capture)
 570  */
 571 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 572 {
 573     HWVoiceIn *hw = sw->hw;
 574     size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 575     struct st_sample *src, *dst = sw->buf;
 576
 577     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 578     if (!live) {
 579         return 0;
 580     }
 581     if (audio_bug(__func__, live > hw->conv_buf->size)) {
 582         dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 583         abort();
 584     }
 585
 586     rpos = audio_ring_posb(hw->conv_buf->pos, live, hw->conv_buf->size);
 587
 588     samples = size / sw->info.bytes_per_frame;
 589
 590     swlim = (live * sw->ratio) >> 32;
 591     swlim = MIN (swlim, samples);
 592
 593     while (swlim) {
 594         src = hw->conv_buf->samples + rpos;
 595         if (hw->conv_buf->pos > rpos) {
 596             isamp = hw->conv_buf->pos - rpos;
 597         } else {
 598             isamp = hw->conv_buf->size - rpos;
 599         }
 600
 601         if (!isamp) {
 602             break;
 603         }
 604         osamp = swlim;
 605
 606         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 607         swlim -= osamp;
 608         rpos = (rpos + isamp) % hw->conv_buf->size;
 609         dst += osamp;
 610         ret += osamp;
 611         total += isamp;
 612     }
 613
 614     if (!hw->pcm_ops->volume_in) {
 615         mixeng_volume (sw->buf, ret, &sw->vol);
 616     }
 617
 618     sw->clip (buf, sw->buf, ret);
 619     sw->total_hw_samples_acquired += total;
 620     return ret * sw->info.bytes_per_frame;
 621 }
 622
 623 /*
 624  * Hard voice (playback)
 625  */
 626 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 627 {
 628     SWVoiceOut *sw;
 629     size_t m = SIZE_MAX;
 630     int nb_live = 0;
 631
 632     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 633         if (sw->active || !sw->empty) {
 634             m = MIN (m, sw->total_hw_samples_mixed);
 635             nb_live += 1;
 636         }
 637     }
 638
 639     *nb_livep = nb_live;
 640     return m;
 641 }
 642
 643 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 644 {
 645     size_t smin;
 646     int nb_live1;
 647
 648     smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 649     if (nb_live) {
 650         *nb_live = nb_live1;
 651     }
 652
 653     if (nb_live1) {
 654         size_t live = smin;
 655
 656         if (audio_bug(__func__, live > hw->mix_buf->size)) {
 657             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 658             abort();
 659         }
 660         return live;
 661     }
 662     return 0;
 663 }
 664
 665 static size_t audio_pcm_hw_get_free(HWVoiceOut *hw)
 666 {
 667     return (hw->pcm_ops->buffer_get_free ? hw->pcm_ops->buffer_get_free(hw) :
 668             INT_MAX) / hw->info.bytes_per_frame;
 669 }
 670
 671 static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 672 {
 673     size_t clipped = 0;
 674     size_t pos = hw->mix_buf->pos;
 675
 676     while (len) {
 677         st_sample *src = hw->mix_buf->samples + pos;
 678         uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
 679         size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
 680         size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 681
 682         hw->clip(dst, src, samples_to_clip);
 683
 684         pos = (pos + samples_to_clip) % hw->mix_buf->size;
 685         len -= samples_to_clip;
 686         clipped += samples_to_clip;
 687     }
 688 }
 689
 690 /*
 691  * Soft voice (playback)
 692  */
 693 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 694 {
 695     size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, blck;
 696     size_t hw_free;
 697     size_t ret = 0, pos = 0, total = 0;
 698
 699     if (!sw) {
 700         return size;
 701     }
 702
 703     hwsamples = sw->hw->mix_buf->size;
 704
 705     live = sw->total_hw_samples_mixed;
 706     if (audio_bug(__func__, live > hwsamples)) {
 707         dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 708         abort();
 709     }
 710
 711     if (live == hwsamples) {
 712 #ifdef DEBUG_OUT
 713         dolog ("%s is full %zu\n", sw->name, live);
 714 #endif
 715         return 0;
 716     }
 717
 718     wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 719
 720     dead = hwsamples - live;
 721     hw_free = audio_pcm_hw_get_free(sw->hw);
 722     hw_free = hw_free > live ? hw_free - live : 0;
 723     samples = ((int64_t)MIN(dead, hw_free) << 32) / sw->ratio;
 724     samples = MIN(samples, size / sw->info.bytes_per_frame);
 725     if (samples) {
 726         sw->conv(sw->buf, buf, samples);
 727
 728         if (!sw->hw->pcm_ops->volume_out) {
 729             mixeng_volume(sw->buf, samples, &sw->vol);
 730         }
 731     }
 732
 733     while (samples) {
 734         dead = hwsamples - live;
 735         left = hwsamples - wpos;
 736         blck = MIN (dead, left);
 737         if (!blck) {
 738             break;
 739         }
 740         isamp = samples;
 741         osamp = blck;
 742         st_rate_flow_mix (
 743             sw->rate,
 744             sw->buf + pos,
 745             sw->hw->mix_buf->samples + wpos,
 746             &isamp,
 747             &osamp
 748             );
 749         ret += isamp;
 750         samples -= isamp;
 751         pos += isamp;
 752         live += osamp;
 753         wpos = (wpos + osamp) % hwsamples;
 754         total += osamp;
 755     }
 756
 757     sw->total_hw_samples_mixed += total;
 758     sw->empty = sw->total_hw_samples_mixed == 0;
 759
 760 #ifdef DEBUG_OUT
 761     dolog (
 762         "%s: write size %zu ret %zu total sw %zu\n",
 763         SW_NAME (sw),
 764         size / sw->info.bytes_per_frame,
 765         ret,
 766         sw->total_hw_samples_mixed
 767         );
 768 #endif
 769
 770     return ret * sw->info.bytes_per_frame;
 771 }
 772
 773 #ifdef DEBUG_AUDIO
 774 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 775 {
 776     dolog("%s: bits %d, sign %d, float %d, freq %d, nchan %d\n",
 777           cap, info->bits, info->is_signed, info->is_float, info->freq,
 778           info->nchannels);
 779 }
 780 #endif
 781
 782 #define DAC
 783 #include "audio_template.h"
 784 #undef DAC
 785 #include "audio_template.h"
 786
 787 /*
 788  * Timer
 789  */
 790 static int audio_is_timer_needed(AudioState *s)
 791 {
 792     HWVoiceIn *hwi = NULL;
 793     HWVoiceOut *hwo = NULL;
 794
 795     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
 796         if (!hwo->poll_mode) {
 797             return 1;
 798         }
 799     }
 800     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
 801         if (!hwi->poll_mode) {
 802             return 1;
 803         }
 804     }
 805     return 0;
 806 }
 807
 808 static void audio_reset_timer (AudioState *s)
 809 {
 810     if (audio_is_timer_needed(s)) {
 811         timer_mod_anticipate_ns(s->ts,
 812             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
 813         if (!s->timer_running) {
 814             s->timer_running = true;
 815             s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 816             trace_audio_timer_start(s->period_ticks / SCALE_MS);
 817         }
 818     } else {
 819         timer_del(s->ts);
 820         if (s->timer_running) {
 821             s->timer_running = false;
 822             trace_audio_timer_stop();
 823         }
 824     }
 825 }
 826
 827 static void audio_timer (void *opaque)
 828 {
 829     int64_t now, diff;
 830     AudioState *s = opaque;
 831
 832     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 833     diff = now - s->timer_last;
 834     if (diff > s->period_ticks * 3 / 2) {
 835         trace_audio_timer_delayed(diff / SCALE_MS);
 836     }
 837     s->timer_last = now;
 838
 839     audio_run(s, "timer");
 840     audio_reset_timer(s);
 841 }
 842
 843 /*
 844  * Public API
 845  */
 846 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size)
 847 {
 848     HWVoiceOut *hw;
 849
 850     if (!sw) {
 851         /* XXX: Consider options */
 852         return size;
 853     }
 854     hw = sw->hw;
 855
 856     if (!hw->enabled) {
 857         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 858         return 0;
 859     }
 860
 861     if (audio_get_pdo_out(hw->s->dev)->mixing_engine) {
 862         return audio_pcm_sw_write(sw, buf, size);
 863     } else {
 864         return hw->pcm_ops->write(hw, buf, size);
 865     }
 866 }
 867
 868 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size)
 869 {
 870     HWVoiceIn *hw;
 871
 872     if (!sw) {
 873         /* XXX: Consider options */
 874         return size;
 875     }
 876     hw = sw->hw;
 877
 878     if (!hw->enabled) {
 879         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 880         return 0;
 881     }
 882
 883     if (audio_get_pdo_in(hw->s->dev)->mixing_engine) {
 884         return audio_pcm_sw_read(sw, buf, size);
 885     } else {
 886         return hw->pcm_ops->read(hw, buf, size);
 887     }
 888 }
 889
 890 int AUD_get_buffer_size_out(SWVoiceOut *sw)
 891 {
 892     return sw->hw->samples * sw->hw->info.bytes_per_frame;
 893 }
 894
 895 void AUD_set_active_out (SWVoiceOut *sw, int on)
 896 {
 897     HWVoiceOut *hw;
 898
 899     if (!sw) {
 900         return;
 901     }
 902
 903     hw = sw->hw;
 904     if (sw->active != on) {
 905         AudioState *s = sw->s;
 906         SWVoiceOut *temp_sw;
 907         SWVoiceCap *sc;
 908
 909         if (on) {
 910             hw->pending_disable = 0;
 911             if (!hw->enabled) {
 912                 hw->enabled = 1;
 913                 if (s->vm_running) {
 914                     if (hw->pcm_ops->enable_out) {
 915                         hw->pcm_ops->enable_out(hw, true);
 916                     }
 917                     audio_reset_timer (s);
 918                 }
 919             }
 920         } else {
 921             if (hw->enabled) {
 922                 int nb_active = 0;
 923
 924                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 925                      temp_sw = temp_sw->entries.le_next) {
 926                     nb_active += temp_sw->active != 0;
 927                 }
 928
 929                 hw->pending_disable = nb_active == 1;
 930             }
 931         }
 932
 933         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
 934             sc->sw.active = hw->enabled;
 935             if (hw->enabled) {
 936                 audio_capture_maybe_changed (sc->cap, 1);
 937             }
 938         }
 939         sw->active = on;
 940     }
 941 }
 942
 943 void AUD_set_active_in (SWVoiceIn *sw, int on)
 944 {
 945     HWVoiceIn *hw;
 946
 947     if (!sw) {
 948         return;
 949     }
 950
 951     hw = sw->hw;
 952     if (sw->active != on) {
 953         AudioState *s = sw->s;
 954         SWVoiceIn *temp_sw;
 955
 956         if (on) {
 957             if (!hw->enabled) {
 958                 hw->enabled = 1;
 959                 if (s->vm_running) {
 960                     if (hw->pcm_ops->enable_in) {
 961                         hw->pcm_ops->enable_in(hw, true);
 962                     }
 963                     audio_reset_timer (s);
 964                 }
 965             }
 966             sw->total_hw_samples_acquired = hw->total_samples_captured;
 967         } else {
 968             if (hw->enabled) {
 969                 int nb_active = 0;
 970
 971                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 972                      temp_sw = temp_sw->entries.le_next) {
 973                     nb_active += temp_sw->active != 0;
 974                 }
 975
 976                 if (nb_active == 1) {
 977                     hw->enabled = 0;
 978                     if (hw->pcm_ops->enable_in) {
 979                         hw->pcm_ops->enable_in(hw, false);
 980                     }
 981                 }
 982             }
 983         }
 984         sw->active = on;
 985     }
 986 }
 987
 988 static size_t audio_get_avail (SWVoiceIn *sw)
 989 {
 990     size_t live;
 991
 992     if (!sw) {
 993         return 0;
 994     }
 995
 996     live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
 997     if (audio_bug(__func__, live > sw->hw->conv_buf->size)) {
 998         dolog("live=%zu sw->hw->conv_buf->size=%zu\n", live,
 999               sw->hw->conv_buf->size);
1000         abort();
1001     }
1002
1003     ldebug (
1004         "%s: get_avail live %zu ret %" PRId64 "\n",
1005         SW_NAME (sw),
1006         live, (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame
1007         );
1008
1009     return (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame;
1010 }
1011
1012 static size_t audio_sw_bytes_free(SWVoiceOut *sw, size_t free)
1013 {
1014     return (((int64_t)free << 32) / sw->ratio) * sw->info.bytes_per_frame;
1015 }
1016
1017 static size_t audio_get_free(SWVoiceOut *sw)
1018 {
1019     size_t live, dead;
1020
1021     if (!sw) {
1022         return 0;
1023     }
1024
1025     live = sw->total_hw_samples_mixed;
1026
1027     if (audio_bug(__func__, live > sw->hw->mix_buf->size)) {
1028         dolog("live=%zu sw->hw->mix_buf->size=%zu\n", live,
1029               sw->hw->mix_buf->size);
1030         abort();
1031     }
1032
1033     dead = sw->hw->mix_buf->size - live;
1034
1035 #ifdef DEBUG_OUT
1036     dolog("%s: get_free live %zu dead %zu sw_bytes %zu\n",
1037           SW_NAME(sw), live, dead, audio_sw_bytes_free(sw, dead));
1038 #endif
1039
1040     return dead;
1041 }
1042
1043 static void audio_capture_mix_and_clear(HWVoiceOut *hw, size_t rpos,
1044                                         size_t samples)
1045 {
1046     size_t n;
1047
1048     if (hw->enabled) {
1049         SWVoiceCap *sc;
1050
1051         for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1052             SWVoiceOut *sw = &sc->sw;
1053             int rpos2 = rpos;
1054
1055             n = samples;
1056             while (n) {
1057                 size_t till_end_of_hw = hw->mix_buf->size - rpos2;
1058                 size_t to_write = MIN(till_end_of_hw, n);
1059                 size_t bytes = to_write * hw->info.bytes_per_frame;
1060                 size_t written;
1061
1062                 sw->buf = hw->mix_buf->samples + rpos2;
1063                 written = audio_pcm_sw_write (sw, NULL, bytes);
1064                 if (written - bytes) {
1065                     dolog("Could not mix %zu bytes into a capture "
1066                           "buffer, mixed %zu\n",
1067                           bytes, written);
1068                     break;
1069                 }
1070                 n -= to_write;
1071                 rpos2 = (rpos2 + to_write) % hw->mix_buf->size;
1072             }
1073         }
1074     }
1075
1076     n = MIN(samples, hw->mix_buf->size - rpos);
1077     mixeng_clear(hw->mix_buf->samples + rpos, n);
1078     mixeng_clear(hw->mix_buf->samples, samples - n);
1079 }
1080
1081 static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
1082 {
1083     size_t clipped = 0;
1084
1085     while (live) {
1086         size_t size = live * hw->info.bytes_per_frame;
1087         size_t decr, proc;
1088         void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
1089
1090         if (size == 0) {
1091             break;
1092         }
1093
1094         decr = MIN(size / hw->info.bytes_per_frame, live);
1095         if (buf) {
1096             audio_pcm_hw_clip_out(hw, buf, decr);
1097         }
1098         proc = hw->pcm_ops->put_buffer_out(hw, buf,
1099                                            decr * hw->info.bytes_per_frame) /
1100             hw->info.bytes_per_frame;
1101
1102         live -= proc;
1103         clipped += proc;
1104         hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size;
1105
1106         if (proc == 0 || proc < decr) {
1107             break;
1108         }
1109     }
1110
1111     if (hw->pcm_ops->run_buffer_out) {
1112         hw->pcm_ops->run_buffer_out(hw);
1113     }
1114
1115     return clipped;
1116 }
1117
1118 static void audio_run_out (AudioState *s)
1119 {
1120     HWVoiceOut *hw = NULL;
1121     SWVoiceOut *sw;
1122
1123     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1124         while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1125             /* there is exactly 1 sw for each hw with no mixeng */
1126             sw = hw->sw_head.lh_first;
1127
1128             if (hw->pending_disable) {
1129                 hw->enabled = 0;
1130                 hw->pending_disable = 0;
1131                 if (hw->pcm_ops->enable_out) {
1132                     hw->pcm_ops->enable_out(hw, false);
1133                 }
1134             }
1135
1136             if (sw->active) {
1137                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1138             }
1139         }
1140         return;
1141     }
1142
1143     while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1144         size_t played, live, prev_rpos;
1145         size_t hw_free = audio_pcm_hw_get_free(hw);
1146         int nb_live;
1147
1148         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1149             if (sw->active) {
1150                 size_t sw_free = audio_get_free(sw);
1151                 size_t free;
1152
1153                 if (hw_free > sw->total_hw_samples_mixed) {
1154                     free = audio_sw_bytes_free(sw,
1155                         MIN(sw_free, hw_free - sw->total_hw_samples_mixed));
1156                 } else {
1157                     free = 0;
1158                 }
1159                 if (free > 0) {
1160                     sw->callback.fn(sw->callback.opaque, free);
1161                 }
1162             }
1163         }
1164
1165         live = audio_pcm_hw_get_live_out (hw, &nb_live);
1166         if (!nb_live) {
1167             live = 0;
1168         }
1169
1170         if (audio_bug(__func__, live > hw->mix_buf->size)) {
1171             dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
1172             abort();
1173         }
1174
1175         if (hw->pending_disable && !nb_live) {
1176             SWVoiceCap *sc;
1177 #ifdef DEBUG_OUT
1178             dolog ("Disabling voice\n");
1179 #endif
1180             hw->enabled = 0;
1181             hw->pending_disable = 0;
1182             if (hw->pcm_ops->enable_out) {
1183                 hw->pcm_ops->enable_out(hw, false);
1184             }
1185             for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1186                 sc->sw.active = 0;
1187                 audio_recalc_and_notify_capture (sc->cap);
1188             }
1189             continue;
1190         }
1191
1192         if (!live) {
1193             if (hw->pcm_ops->run_buffer_out) {
1194                 hw->pcm_ops->run_buffer_out(hw);
1195             }
1196             continue;
1197         }
1198
1199         prev_rpos = hw->mix_buf->pos;
1200         played = audio_pcm_hw_run_out(hw, live);
1201         replay_audio_out(&played);
1202         if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) {
1203             dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n",
1204                   hw->mix_buf->pos, hw->mix_buf->size, played);
1205             abort();
1206         }
1207
1208 #ifdef DEBUG_OUT
1209         dolog("played=%zu\n", played);
1210 #endif
1211
1212         if (played) {
1213             hw->ts_helper += played;
1214             audio_capture_mix_and_clear (hw, prev_rpos, played);
1215         }
1216
1217         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1218             if (!sw->active && sw->empty) {
1219                 continue;
1220             }
1221
1222             if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) {
1223                 dolog("played=%zu sw->total_hw_samples_mixed=%zu\n",
1224                       played, sw->total_hw_samples_mixed);
1225                 abort();
1226             }
1227
1228             sw->total_hw_samples_mixed -= played;
1229
1230             if (!sw->total_hw_samples_mixed) {
1231                 sw->empty = 1;
1232             }
1233         }
1234     }
1235 }
1236
1237 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1238 {
1239     size_t conv = 0;
1240
1241     if (hw->pcm_ops->run_buffer_in) {
1242         hw->pcm_ops->run_buffer_in(hw);
1243     }
1244
1245     while (samples) {
1246         size_t proc;
1247         size_t size = samples * hw->info.bytes_per_frame;
1248         void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1249
1250         assert(size % hw->info.bytes_per_frame == 0);
1251         if (size == 0) {
1252             break;
1253         }
1254
1255         proc = audio_pcm_hw_conv_in(hw, buf, size / hw->info.bytes_per_frame);
1256
1257         samples -= proc;
1258         conv += proc;
1259         hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1260     }
1261
1262     return conv;
1263 }
1264
1265 static void audio_run_in (AudioState *s)
1266 {
1267     HWVoiceIn *hw = NULL;
1268
1269     if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1270         while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1271             /* there is exactly 1 sw for each hw with no mixeng */
1272             SWVoiceIn *sw = hw->sw_head.lh_first;
1273             if (sw->active) {
1274                 sw->callback.fn(sw->callback.opaque, INT_MAX);
1275             }
1276         }
1277         return;
1278     }
1279
1280     while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1281         SWVoiceIn *sw;
1282         size_t captured = 0, min;
1283
1284         if (replay_mode != REPLAY_MODE_PLAY) {
1285             captured = audio_pcm_hw_run_in(
1286                 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1287         }
1288         replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1289                         hw->conv_buf->size);
1290
1291         min = audio_pcm_hw_find_min_in (hw);
1292         hw->total_samples_captured += captured - min;
1293         hw->ts_helper += captured;
1294
1295         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1296             sw->total_hw_samples_acquired -= min;
1297
1298             if (sw->active) {
1299                 size_t avail;
1300
1301                 avail = audio_get_avail (sw);
1302                 if (avail > 0) {
1303                     sw->callback.fn (sw->callback.opaque, avail);
1304                 }
1305             }
1306         }
1307     }
1308 }
1309
1310 static void audio_run_capture (AudioState *s)
1311 {
1312     CaptureVoiceOut *cap;
1313
1314     for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1315         size_t live, rpos, captured;
1316         HWVoiceOut *hw = &cap->hw;
1317         SWVoiceOut *sw;
1318
1319         captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1320         rpos = hw->mix_buf->pos;
1321         while (live) {
1322             size_t left = hw->mix_buf->size - rpos;
1323             size_t to_capture = MIN(live, left);
1324             struct st_sample *src;
1325             struct capture_callback *cb;
1326
1327             src = hw->mix_buf->samples + rpos;
1328             hw->clip (cap->buf, src, to_capture);
1329             mixeng_clear (src, to_capture);
1330
1331             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1332                 cb->ops.capture (cb->opaque, cap->buf,
1333                                  to_capture * hw->info.bytes_per_frame);
1334             }
1335             rpos = (rpos + to_capture) % hw->mix_buf->size;
1336             live -= to_capture;
1337         }
1338         hw->mix_buf->pos = rpos;
1339
1340         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1341             if (!sw->active && sw->empty) {
1342                 continue;
1343             }
1344
1345             if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1346                 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1347                       captured, sw->total_hw_samples_mixed);
1348                 abort();
1349             }
1350
1351             sw->total_hw_samples_mixed -= captured;
1352             sw->empty = sw->total_hw_samples_mixed == 0;
1353         }
1354     }
1355 }
1356
1357 void audio_run(AudioState *s, const char *msg)
1358 {
1359     audio_run_out(s);
1360     audio_run_in(s);
1361     audio_run_capture(s);
1362
1363 #ifdef DEBUG_POLL
1364     {
1365         static double prevtime;
1366         double currtime;
1367         struct timeval tv;
1368
1369         if (gettimeofday (&tv, NULL)) {
1370             perror ("audio_run: gettimeofday");
1371             return;
1372         }
1373
1374         currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1375         dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1376         prevtime = currtime;
1377     }
1378 #endif
1379 }
1380
1381 void audio_generic_run_buffer_in(HWVoiceIn *hw)
1382 {
1383     if (unlikely(!hw->buf_emul)) {
1384         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
1385         hw->buf_emul = g_malloc(hw->size_emul);
1386         hw->pos_emul = hw->pending_emul = 0;
1387     }
1388
1389     while (hw->pending_emul < hw->size_emul) {
1390         size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1391                               hw->size_emul - hw->pending_emul);
1392         size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1393                                         read_len);
1394         hw->pending_emul += read;
1395         hw->pos_emul = (hw->pos_emul + read) % hw->size_emul;
1396         if (read < read_len) {
1397             break;
1398         }
1399     }
1400 }
1401
1402 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1403 {
1404     size_t start;
1405
1406     start = audio_ring_posb(hw->pos_emul, hw->pending_emul, hw->size_emul);
1407     assert(start < hw->size_emul);
1408
1409     *size = MIN(*size, hw->pending_emul);
1410     *size = MIN(*size, hw->size_emul - start);
1411     return hw->buf_emul + start;
1412 }
1413
1414 void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
1415 {
1416     assert(size <= hw->pending_emul);
1417     hw->pending_emul -= size;
1418 }
1419
1420 size_t audio_generic_buffer_get_free(HWVoiceOut *hw)
1421 {
1422     if (hw->buf_emul) {
1423         return hw->size_emul - hw->pending_emul;
1424     } else {
1425         return hw->samples * hw->info.bytes_per_frame;
1426     }
1427 }
1428
1429 void audio_generic_run_buffer_out(HWVoiceOut *hw)
1430 {
1431     while (hw->pending_emul) {
1432         size_t write_len, written, start;
1433
1434         start = audio_ring_posb(hw->pos_emul, hw->pending_emul, hw->size_emul);
1435         assert(start < hw->size_emul);
1436
1437         write_len = MIN(hw->pending_emul, hw->size_emul - start);
1438
1439         written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1440         hw->pending_emul -= written;
1441
1442         if (written < write_len) {
1443             break;
1444         }
1445     }
1446 }
1447
1448 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1449 {
1450     if (unlikely(!hw->buf_emul)) {
1451         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
1452         hw->buf_emul = g_malloc(hw->size_emul);
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     if (hw->pcm_ops->buffer_get_free) {
1477         size_t free = hw->pcm_ops->buffer_get_free(hw);
1478
1479         size = MIN(size, free);
1480     }
1481
1482     while (total < size) {
1483         size_t dst_size = size - total;
1484         size_t copy_size, proc;
1485         void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1486
1487         if (dst_size == 0) {
1488             break;
1489         }
1490
1491         copy_size = MIN(size - total, dst_size);
1492         if (dst) {
1493             memcpy(dst, (char *)buf + total, copy_size);
1494         }
1495         proc = hw->pcm_ops->put_buffer_out(hw, dst, copy_size);
1496         total += proc;
1497
1498         if (proc == 0 || proc < copy_size) {
1499             break;
1500         }
1501     }
1502
1503     if (hw->pcm_ops->run_buffer_out) {
1504         hw->pcm_ops->run_buffer_out(hw);
1505     }
1506
1507     return total;
1508 }
1509
1510 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1511 {
1512     size_t total = 0;
1513
1514     if (hw->pcm_ops->run_buffer_in) {
1515         hw->pcm_ops->run_buffer_in(hw);
1516     }
1517
1518     while (total < size) {
1519         size_t src_size = size - total;
1520         void *src = hw->pcm_ops->get_buffer_in(hw, &src_size);
1521
1522         if (src_size == 0) {
1523             break;
1524         }
1525
1526         memcpy((char *)buf + total, src, src_size);
1527         hw->pcm_ops->put_buffer_in(hw, src, src_size);
1528         total += src_size;
1529     }
1530
1531     return total;
1532 }
1533
1534 static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1535                              bool msg, Audiodev *dev)
1536 {
1537     s->drv_opaque = drv->init(dev);
1538
1539     if (s->drv_opaque) {
1540         if (!drv->pcm_ops->get_buffer_in) {
1541             drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1542             drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1543         }
1544         if (!drv->pcm_ops->get_buffer_out) {
1545             drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1546             drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1547         }
1548
1549         audio_init_nb_voices_out(s, drv);
1550         audio_init_nb_voices_in(s, drv);
1551         s->drv = drv;
1552         return 0;
1553     } else {
1554         if (msg) {
1555             dolog("Could not init `%s' audio driver\n", drv->name);
1556         }
1557         return -1;
1558     }
1559 }
1560
1561 static void audio_vm_change_state_handler (void *opaque, bool running,
1562                                            RunState state)
1563 {
1564     AudioState *s = opaque;
1565     HWVoiceOut *hwo = NULL;
1566     HWVoiceIn *hwi = NULL;
1567
1568     s->vm_running = running;
1569     while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1570         if (hwo->pcm_ops->enable_out) {
1571             hwo->pcm_ops->enable_out(hwo, running);
1572         }
1573     }
1574
1575     while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1576         if (hwi->pcm_ops->enable_in) {
1577             hwi->pcm_ops->enable_in(hwi, running);
1578         }
1579     }
1580     audio_reset_timer (s);
1581 }
1582
1583 static void free_audio_state(AudioState *s)
1584 {
1585     HWVoiceOut *hwo, *hwon;
1586     HWVoiceIn *hwi, *hwin;
1587
1588     QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1589         SWVoiceCap *sc;
1590
1591         if (hwo->enabled && hwo->pcm_ops->enable_out) {
1592             hwo->pcm_ops->enable_out(hwo, false);
1593         }
1594         hwo->pcm_ops->fini_out (hwo);
1595
1596         for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1597             CaptureVoiceOut *cap = sc->cap;
1598             struct capture_callback *cb;
1599
1600             for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1601                 cb->ops.destroy (cb->opaque);
1602             }
1603         }
1604         QLIST_REMOVE(hwo, entries);
1605     }
1606
1607     QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1608         if (hwi->enabled && hwi->pcm_ops->enable_in) {
1609             hwi->pcm_ops->enable_in(hwi, false);
1610         }
1611         hwi->pcm_ops->fini_in (hwi);
1612         QLIST_REMOVE(hwi, entries);
1613     }
1614
1615     if (s->drv) {
1616         s->drv->fini (s->drv_opaque);
1617         s->drv = NULL;
1618     }
1619
1620     if (s->dev) {
1621         qapi_free_Audiodev(s->dev);
1622         s->dev = NULL;
1623     }
1624
1625     if (s->ts) {
1626         timer_free(s->ts);
1627         s->ts = NULL;
1628     }
1629
1630     g_free(s);
1631 }
1632
1633 void audio_cleanup(void)
1634 {
1635     while (!QTAILQ_EMPTY(&audio_states)) {
1636         AudioState *s = QTAILQ_FIRST(&audio_states);
1637         QTAILQ_REMOVE(&audio_states, s, list);
1638         free_audio_state(s);
1639     }
1640 }
1641
1642 static bool vmstate_audio_needed(void *opaque)
1643 {
1644     /*
1645      * Never needed, this vmstate only exists in case
1646      * an old qemu sends it to us.
1647      */
1648     return false;
1649 }
1650
1651 static const VMStateDescription vmstate_audio = {
1652     .name = "audio",
1653     .version_id = 1,
1654     .minimum_version_id = 1,
1655     .needed = vmstate_audio_needed,
1656     .fields = (VMStateField[]) {
1657         VMSTATE_END_OF_LIST()
1658     }
1659 };
1660
1661 static void audio_validate_opts(Audiodev *dev, Error **errp);
1662
1663 static AudiodevListEntry *audiodev_find(
1664     AudiodevListHead *head, const char *drvname)
1665 {
1666     AudiodevListEntry *e;
1667     QSIMPLEQ_FOREACH(e, head, next) {
1668         if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1669             return e;
1670         }
1671     }
1672
1673     return NULL;
1674 }
1675
1676 /*
1677  * if we have dev, this function was called because of an -audiodev argument =>
1678  *   initialize a new state with it
1679  * if dev == NULL => legacy implicit initialization, return the already created
1680  *   state or create a new one
1681  */
1682 static AudioState *audio_init(Audiodev *dev, const char *name)
1683 {
1684     static bool atexit_registered;
1685     size_t i;
1686     int done = 0;
1687     const char *drvname = NULL;
1688     VMChangeStateEntry *e;
1689     AudioState *s;
1690     struct audio_driver *driver;
1691     /* silence gcc warning about uninitialized variable */
1692     AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1693
1694     if (using_spice) {
1695         /*
1696          * When using spice allow the spice audio driver being picked
1697          * as default.
1698          *
1699          * Temporary hack.  Using audio devices without explicit
1700          * audiodev= property is already deprecated.  Same goes for
1701          * the -soundhw switch.  Once this support gets finally
1702          * removed we can also drop the concept of a default audio
1703          * backend and this can go away.
1704          */
1705         driver = audio_driver_lookup("spice");
1706         if (driver) {
1707             driver->can_be_default = 1;
1708         }
1709     }
1710
1711     if (dev) {
1712         /* -audiodev option */
1713         legacy_config = false;
1714         drvname = AudiodevDriver_str(dev->driver);
1715     } else if (!QTAILQ_EMPTY(&audio_states)) {
1716         if (!legacy_config) {
1717             dolog("Device %s: audiodev default parameter is deprecated, please "
1718                   "specify audiodev=%s\n", name,
1719                   QTAILQ_FIRST(&audio_states)->dev->id);
1720         }
1721         return QTAILQ_FIRST(&audio_states);
1722     } else {
1723         /* legacy implicit initialization */
1724         head = audio_handle_legacy_opts();
1725         /*
1726          * In case of legacy initialization, all Audiodevs in the list will have
1727          * the same configuration (except the driver), so it doesn't matter which
1728          * one we chose.  We need an Audiodev to set up AudioState before we can
1729          * init a driver.  Also note that dev at this point is still in the
1730          * list.
1731          */
1732         dev = QSIMPLEQ_FIRST(&head)->dev;
1733         audio_validate_opts(dev, &error_abort);
1734     }
1735
1736     s = g_new0(AudioState, 1);
1737     s->dev = dev;
1738
1739     QLIST_INIT (&s->hw_head_out);
1740     QLIST_INIT (&s->hw_head_in);
1741     QLIST_INIT (&s->cap_head);
1742     if (!atexit_registered) {
1743         atexit(audio_cleanup);
1744         atexit_registered = true;
1745     }
1746     QTAILQ_INSERT_TAIL(&audio_states, s, list);
1747
1748     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1749
1750     s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1751     s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1752
1753     if (s->nb_hw_voices_out <= 0) {
1754         dolog ("Bogus number of playback voices %d, setting to 1\n",
1755                s->nb_hw_voices_out);
1756         s->nb_hw_voices_out = 1;
1757     }
1758
1759     if (s->nb_hw_voices_in <= 0) {
1760         dolog ("Bogus number of capture voices %d, setting to 0\n",
1761                s->nb_hw_voices_in);
1762         s->nb_hw_voices_in = 0;
1763     }
1764
1765     if (drvname) {
1766         driver = audio_driver_lookup(drvname);
1767         if (driver) {
1768             done = !audio_driver_init(s, driver, true, dev);
1769         } else {
1770             dolog ("Unknown audio driver `%s'\n", drvname);
1771         }
1772     } else {
1773         for (i = 0; audio_prio_list[i]; i++) {
1774             AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1775             driver = audio_driver_lookup(audio_prio_list[i]);
1776
1777             if (e && driver) {
1778                 s->dev = dev = e->dev;
1779                 audio_validate_opts(dev, &error_abort);
1780                 done = !audio_driver_init(s, driver, false, dev);
1781                 if (done) {
1782                     e->dev = NULL;
1783                     break;
1784                 }
1785             }
1786         }
1787     }
1788     audio_free_audiodev_list(&head);
1789
1790     if (!done) {
1791         driver = audio_driver_lookup("none");
1792         done = !audio_driver_init(s, driver, false, dev);
1793         assert(done);
1794         dolog("warning: Using timer based audio emulation\n");
1795     }
1796
1797     if (dev->timer_period <= 0) {
1798         s->period_ticks = 1;
1799     } else {
1800         s->period_ticks = dev->timer_period * (int64_t)SCALE_US;
1801     }
1802
1803     e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1804     if (!e) {
1805         dolog ("warning: Could not register change state handler\n"
1806                "(Audio can continue looping even after stopping the VM)\n");
1807     }
1808
1809     QLIST_INIT (&s->card_head);
1810     vmstate_register (NULL, 0, &vmstate_audio, s);
1811     return s;
1812 }
1813
1814 void audio_free_audiodev_list(AudiodevListHead *head)
1815 {
1816     AudiodevListEntry *e;
1817     while ((e = QSIMPLEQ_FIRST(head))) {
1818         QSIMPLEQ_REMOVE_HEAD(head, next);
1819         qapi_free_Audiodev(e->dev);
1820         g_free(e);
1821     }
1822 }
1823
1824 void AUD_register_card (const char *name, QEMUSoundCard *card)
1825 {
1826     if (!card->state) {
1827         card->state = audio_init(NULL, name);
1828     }
1829
1830     card->name = g_strdup (name);
1831     memset (&card->entries, 0, sizeof (card->entries));
1832     QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1833 }
1834
1835 void AUD_remove_card (QEMUSoundCard *card)
1836 {
1837     QLIST_REMOVE (card, entries);
1838     g_free (card->name);
1839 }
1840
1841 static struct audio_pcm_ops capture_pcm_ops;
1842
1843 CaptureVoiceOut *AUD_add_capture(
1844     AudioState *s,
1845     struct audsettings *as,
1846     struct audio_capture_ops *ops,
1847     void *cb_opaque
1848     )
1849 {
1850     CaptureVoiceOut *cap;
1851     struct capture_callback *cb;
1852
1853     if (!s) {
1854         if (!legacy_config) {
1855             dolog("Capturing without setting an audiodev is deprecated\n");
1856         }
1857         s = audio_init(NULL, NULL);
1858     }
1859
1860     if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1861         dolog("Can't capture with mixeng disabled\n");
1862         return NULL;
1863     }
1864
1865     if (audio_validate_settings (as)) {
1866         dolog ("Invalid settings were passed when trying to add capture\n");
1867         audio_print_settings (as);
1868         return NULL;
1869     }
1870
1871     cb = g_malloc0(sizeof(*cb));
1872     cb->ops = *ops;
1873     cb->opaque = cb_opaque;
1874
1875     cap = audio_pcm_capture_find_specific(s, as);
1876     if (cap) {
1877         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1878         return cap;
1879     } else {
1880         HWVoiceOut *hw;
1881         CaptureVoiceOut *cap;
1882
1883         cap = g_malloc0(sizeof(*cap));
1884
1885         hw = &cap->hw;
1886         hw->s = s;
1887         hw->pcm_ops = &capture_pcm_ops;
1888         QLIST_INIT (&hw->sw_head);
1889         QLIST_INIT (&cap->cb_head);
1890
1891         /* XXX find a more elegant way */
1892         hw->samples = 4096 * 4;
1893         audio_pcm_hw_alloc_resources_out(hw);
1894
1895         audio_pcm_init_info (&hw->info, as);
1896
1897         cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1898
1899         if (hw->info.is_float) {
1900             hw->clip = mixeng_clip_float[hw->info.nchannels == 2];
1901         } else {
1902             hw->clip = mixeng_clip
1903                 [hw->info.nchannels == 2]
1904                 [hw->info.is_signed]
1905                 [hw->info.swap_endianness]
1906                 [audio_bits_to_index(hw->info.bits)];
1907         }
1908
1909         QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1910         QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1911
1912         QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1913             audio_attach_capture (hw);
1914         }
1915         return cap;
1916     }
1917 }
1918
1919 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1920 {
1921     struct capture_callback *cb;
1922
1923     for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1924         if (cb->opaque == cb_opaque) {
1925             cb->ops.destroy (cb_opaque);
1926             QLIST_REMOVE (cb, entries);
1927             g_free (cb);
1928
1929             if (!cap->cb_head.lh_first) {
1930                 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1931
1932                 while (sw) {
1933                     SWVoiceCap *sc = (SWVoiceCap *) sw;
1934 #ifdef DEBUG_CAPTURE
1935                     dolog ("freeing %s\n", sw->name);
1936 #endif
1937
1938                     sw1 = sw->entries.le_next;
1939                     if (sw->rate) {
1940                         st_rate_stop (sw->rate);
1941                         sw->rate = NULL;
1942                     }
1943                     QLIST_REMOVE (sw, entries);
1944                     QLIST_REMOVE (sc, entries);
1945                     g_free (sc);
1946                     sw = sw1;
1947                 }
1948                 QLIST_REMOVE (cap, entries);
1949                 g_free (cap->hw.mix_buf);
1950                 g_free (cap->buf);
1951                 g_free (cap);
1952             }
1953             return;
1954         }
1955     }
1956 }
1957
1958 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1959 {
1960     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1961     audio_set_volume_out(sw, &vol);
1962 }
1963
1964 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1965 {
1966     if (sw) {
1967         HWVoiceOut *hw = sw->hw;
1968
1969         sw->vol.mute = vol->mute;
1970         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1971         sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1972             255;
1973
1974         if (hw->pcm_ops->volume_out) {
1975             hw->pcm_ops->volume_out(hw, vol);
1976         }
1977     }
1978 }
1979
1980 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1981 {
1982     Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1983     audio_set_volume_in(sw, &vol);
1984 }
1985
1986 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1987 {
1988     if (sw) {
1989         HWVoiceIn *hw = sw->hw;
1990
1991         sw->vol.mute = vol->mute;
1992         sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1993         sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1994             255;
1995
1996         if (hw->pcm_ops->volume_in) {
1997             hw->pcm_ops->volume_in(hw, vol);
1998         }
1999     }
2000 }
2001
2002 void audio_create_pdos(Audiodev *dev)
2003 {
2004     switch (dev->driver) {
2005 #define CASE(DRIVER, driver, pdo_name)                              \
2006     case AUDIODEV_DRIVER_##DRIVER:                                  \
2007         if (!dev->u.driver.has_in) {                                \
2008             dev->u.driver.in = g_malloc0(                           \
2009                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
2010             dev->u.driver.has_in = true;                            \
2011         }                                                           \
2012         if (!dev->u.driver.has_out) {                               \
2013             dev->u.driver.out = g_malloc0(                          \
2014                 sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
2015             dev->u.driver.has_out = true;                           \
2016         }                                                           \
2017         break
2018
2019         CASE(NONE, none, );
2020         CASE(ALSA, alsa, Alsa);
2021         CASE(COREAUDIO, coreaudio, Coreaudio);
2022         CASE(DBUS, dbus, );
2023         CASE(DSOUND, dsound, );
2024         CASE(JACK, jack, Jack);
2025         CASE(OSS, oss, Oss);
2026         CASE(PA, pa, Pa);
2027         CASE(SDL, sdl, Sdl);
2028         CASE(SPICE, spice, );
2029         CASE(WAV, wav, );
2030
2031     case AUDIODEV_DRIVER__MAX:
2032         abort();
2033     };
2034 }
2035
2036 static void audio_validate_per_direction_opts(
2037     AudiodevPerDirectionOptions *pdo, Error **errp)
2038 {
2039     if (!pdo->has_mixing_engine) {
2040         pdo->has_mixing_engine = true;
2041         pdo->mixing_engine = true;
2042     }
2043     if (!pdo->has_fixed_settings) {
2044         pdo->has_fixed_settings = true;
2045         pdo->fixed_settings = pdo->mixing_engine;
2046     }
2047     if (!pdo->fixed_settings &&
2048         (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
2049         error_setg(errp,
2050                    "You can't use frequency, channels or format with fixed-settings=off");
2051         return;
2052     }
2053     if (!pdo->mixing_engine && pdo->fixed_settings) {
2054         error_setg(errp, "You can't use fixed-settings without mixeng");
2055         return;
2056     }
2057
2058     if (!pdo->has_frequency) {
2059         pdo->has_frequency = true;
2060         pdo->frequency = 44100;
2061     }
2062     if (!pdo->has_channels) {
2063         pdo->has_channels = true;
2064         pdo->channels = 2;
2065     }
2066     if (!pdo->has_voices) {
2067         pdo->has_voices = true;
2068         pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2069     }
2070     if (!pdo->has_format) {
2071         pdo->has_format = true;
2072         pdo->format = AUDIO_FORMAT_S16;
2073     }
2074 }
2075
2076 static void audio_validate_opts(Audiodev *dev, Error **errp)
2077 {
2078     Error *err = NULL;
2079
2080     audio_create_pdos(dev);
2081
2082     audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2083     if (err) {
2084         error_propagate(errp, err);
2085         return;
2086     }
2087
2088     audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2089     if (err) {
2090         error_propagate(errp, err);
2091         return;
2092     }
2093
2094     if (!dev->has_timer_period) {
2095         dev->has_timer_period = true;
2096         dev->timer_period = 10000; /* 100Hz -> 10ms */
2097     }
2098 }
2099
2100 void audio_parse_option(const char *opt)
2101 {
2102     AudiodevListEntry *e;
2103     Audiodev *dev = NULL;
2104
2105     Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2106     visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2107     visit_free(v);
2108
2109     audio_validate_opts(dev, &error_fatal);
2110
2111     e = g_new0(AudiodevListEntry, 1);
2112     e->dev = dev;
2113     QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2114 }
2115
2116 void audio_init_audiodevs(void)
2117 {
2118     AudiodevListEntry *e;
2119
2120     QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2121         audio_init(e->dev, NULL);
2122     }
2123 }
2124
2125 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2126 {
2127     return (audsettings) {
2128         .freq = pdo->frequency,
2129         .nchannels = pdo->channels,
2130         .fmt = pdo->format,
2131         .endianness = AUDIO_HOST_ENDIANNESS,
2132     };
2133 }
2134
2135 int audioformat_bytes_per_sample(AudioFormat fmt)
2136 {
2137     switch (fmt) {
2138     case AUDIO_FORMAT_U8:
2139     case AUDIO_FORMAT_S8:
2140         return 1;
2141
2142     case AUDIO_FORMAT_U16:
2143     case AUDIO_FORMAT_S16:
2144         return 2;
2145
2146     case AUDIO_FORMAT_U32:
2147     case AUDIO_FORMAT_S32:
2148     case AUDIO_FORMAT_F32:
2149         return 4;
2150
2151     case AUDIO_FORMAT__MAX:
2152         ;
2153     }
2154     abort();
2155 }
2156
2157
2158 /* frames = freq * usec / 1e6 */
2159 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2160                         audsettings *as, int def_usecs)
2161 {
2162     uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2163     return (as->freq * usecs + 500000) / 1000000;
2164 }
2165
2166 /* samples = channels * frames = channels * freq * usec / 1e6 */
2167 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2168                          audsettings *as, int def_usecs)
2169 {
2170     return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2171 }
2172
2173 /*
2174  * bytes = bytes_per_sample * samples =
2175  *     bytes_per_sample * channels * freq * usec / 1e6
2176  */
2177 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2178                        audsettings *as, int def_usecs)
2179 {
2180     return audio_buffer_samples(pdo, as, def_usecs) *
2181         audioformat_bytes_per_sample(as->fmt);
2182 }
2183
2184 AudioState *audio_state_by_name(const char *name)
2185 {
2186     AudioState *s;
2187     QTAILQ_FOREACH(s, &audio_states, list) {
2188         assert(s->dev);
2189         if (strcmp(name, s->dev->id) == 0) {
2190             return s;
2191         }
2192     }
2193     return NULL;
2194 }
2195
2196 const char *audio_get_id(QEMUSoundCard *card)
2197 {
2198     if (card->state) {
2199         assert(card->state->dev);
2200         return card->state->dev->id;
2201     } else {
2202         return "";
2203     }
2204 }
2205
2206 const char *audio_application_name(void)
2207 {
2208     const char *vm_name;
2209
2210     vm_name = qemu_get_vm_name();
2211     return vm_name ? vm_name : "qemu";
2212 }
2213
2214 void audio_rate_start(RateCtl *rate)
2215 {
2216     memset(rate, 0, sizeof(RateCtl));
2217     rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2218 }
2219
2220 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2221                             size_t bytes_avail)
2222 {
2223     int64_t now;
2224     int64_t ticks;
2225     int64_t bytes;
2226     int64_t samples;
2227     size_t ret;
2228
2229     now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2230     ticks = now - rate->start_ticks;
2231     bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2232     samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2233     if (samples < 0 || samples > 65536) {
2234         AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2235         audio_rate_start(rate);
2236         samples = 0;
2237     }
2238
2239     ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2240     rate->bytes_sent += ret;
2241     return ret;
2242 }