qemu/audio/audio.c
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   1/*
   2 * QEMU Audio subsystem
   3 *
   4 * Copyright (c) 2003-2005 Vassili Karpov (malc)
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "qemu/osdep.h"
  26#include "audio.h"
  27#include "migration/vmstate.h"
  28#include "monitor/monitor.h"
  29#include "qemu/timer.h"
  30#include "qapi/error.h"
  31#include "qapi/qobject-input-visitor.h"
  32#include "qapi/qapi-visit-audio.h"
  33#include "qemu/cutils.h"
  34#include "qemu/module.h"
  35#include "sysemu/replay.h"
  36#include "sysemu/runstate.h"
  37#include "trace.h"
  38
  39#define AUDIO_CAP "audio"
  40#include "audio_int.h"
  41
  42/* #define DEBUG_LIVE */
  43/* #define DEBUG_OUT */
  44/* #define DEBUG_CAPTURE */
  45/* #define DEBUG_POLL */
  46
  47#define SW_NAME(sw) (sw)->name ? (sw)->name : "unknown"
  48
  49
  50/* Order of CONFIG_AUDIO_DRIVERS is import.
  51   The 1st one is the one used by default, that is the reason
  52    that we generate the list.
  53*/
  54const char *audio_prio_list[] = {
  55    "spice",
  56    CONFIG_AUDIO_DRIVERS
  57    "none",
  58    "wav",
  59    NULL
  60};
  61
  62static QLIST_HEAD(, audio_driver) audio_drivers;
  63static AudiodevListHead audiodevs = QSIMPLEQ_HEAD_INITIALIZER(audiodevs);
  64
  65void audio_driver_register(audio_driver *drv)
  66{
  67    QLIST_INSERT_HEAD(&audio_drivers, drv, next);
  68}
  69
  70audio_driver *audio_driver_lookup(const char *name)
  71{
  72    struct audio_driver *d;
  73
  74    QLIST_FOREACH(d, &audio_drivers, next) {
  75        if (strcmp(name, d->name) == 0) {
  76            return d;
  77        }
  78    }
  79
  80    audio_module_load_one(name);
  81    QLIST_FOREACH(d, &audio_drivers, next) {
  82        if (strcmp(name, d->name) == 0) {
  83            return d;
  84        }
  85    }
  86
  87    return NULL;
  88}
  89
  90static QTAILQ_HEAD(AudioStateHead, AudioState) audio_states =
  91    QTAILQ_HEAD_INITIALIZER(audio_states);
  92
  93const struct mixeng_volume nominal_volume = {
  94    .mute = 0,
  95#ifdef FLOAT_MIXENG
  96    .r = 1.0,
  97    .l = 1.0,
  98#else
  99    .r = 1ULL << 32,
 100    .l = 1ULL << 32,
 101#endif
 102};
 103
 104static bool legacy_config = true;
 105
 106#ifdef AUDIO_IS_FLAWLESS_AND_NO_CHECKS_ARE_REQURIED
 107#error No its not
 108#else
 109int audio_bug (const char *funcname, int cond)
 110{
 111    if (cond) {
 112        static int shown;
 113
 114        AUD_log (NULL, "A bug was just triggered in %s\n", funcname);
 115        if (!shown) {
 116            shown = 1;
 117            AUD_log (NULL, "Save all your work and restart without audio\n");
 118            AUD_log (NULL, "I am sorry\n");
 119        }
 120        AUD_log (NULL, "Context:\n");
 121
 122#if defined AUDIO_BREAKPOINT_ON_BUG
 123#  if defined HOST_I386
 124#    if defined __GNUC__
 125        __asm__ ("int3");
 126#    elif defined _MSC_VER
 127        _asm _emit 0xcc;
 128#    else
 129        abort ();
 130#    endif
 131#  else
 132        abort ();
 133#  endif
 134#endif
 135    }
 136
 137    return cond;
 138}
 139#endif
 140
 141static inline int audio_bits_to_index (int bits)
 142{
 143    switch (bits) {
 144    case 8:
 145        return 0;
 146
 147    case 16:
 148        return 1;
 149
 150    case 32:
 151        return 2;
 152
 153    default:
 154        audio_bug ("bits_to_index", 1);
 155        AUD_log (NULL, "invalid bits %d\n", bits);
 156        return 0;
 157    }
 158}
 159
 160void *audio_calloc (const char *funcname, int nmemb, size_t size)
 161{
 162    int cond;
 163    size_t len;
 164
 165    len = nmemb * size;
 166    cond = !nmemb || !size;
 167    cond |= nmemb < 0;
 168    cond |= len < size;
 169
 170    if (audio_bug ("audio_calloc", cond)) {
 171        AUD_log (NULL, "%s passed invalid arguments to audio_calloc\n",
 172                 funcname);
 173        AUD_log (NULL, "nmemb=%d size=%zu (len=%zu)\n", nmemb, size, len);
 174        return NULL;
 175    }
 176
 177    return g_malloc0 (len);
 178}
 179
 180void AUD_vlog (const char *cap, const char *fmt, va_list ap)
 181{
 182    if (cap) {
 183        fprintf(stderr, "%s: ", cap);
 184    }
 185
 186    vfprintf(stderr, fmt, ap);
 187}
 188
 189void AUD_log (const char *cap, const char *fmt, ...)
 190{
 191    va_list ap;
 192
 193    va_start (ap, fmt);
 194    AUD_vlog (cap, fmt, ap);
 195    va_end (ap);
 196}
 197
 198static void audio_print_settings (struct audsettings *as)
 199{
 200    dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels);
 201
 202    switch (as->fmt) {
 203    case AUDIO_FORMAT_S8:
 204        AUD_log (NULL, "S8");
 205        break;
 206    case AUDIO_FORMAT_U8:
 207        AUD_log (NULL, "U8");
 208        break;
 209    case AUDIO_FORMAT_S16:
 210        AUD_log (NULL, "S16");
 211        break;
 212    case AUDIO_FORMAT_U16:
 213        AUD_log (NULL, "U16");
 214        break;
 215    case AUDIO_FORMAT_S32:
 216        AUD_log (NULL, "S32");
 217        break;
 218    case AUDIO_FORMAT_U32:
 219        AUD_log (NULL, "U32");
 220        break;
 221    default:
 222        AUD_log (NULL, "invalid(%d)", as->fmt);
 223        break;
 224    }
 225
 226    AUD_log (NULL, " endianness=");
 227    switch (as->endianness) {
 228    case 0:
 229        AUD_log (NULL, "little");
 230        break;
 231    case 1:
 232        AUD_log (NULL, "big");
 233        break;
 234    default:
 235        AUD_log (NULL, "invalid");
 236        break;
 237    }
 238    AUD_log (NULL, "\n");
 239}
 240
 241static int audio_validate_settings (struct audsettings *as)
 242{
 243    int invalid;
 244
 245    invalid = as->nchannels < 1;
 246    invalid |= as->endianness != 0 && as->endianness != 1;
 247
 248    switch (as->fmt) {
 249    case AUDIO_FORMAT_S8:
 250    case AUDIO_FORMAT_U8:
 251    case AUDIO_FORMAT_S16:
 252    case AUDIO_FORMAT_U16:
 253    case AUDIO_FORMAT_S32:
 254    case AUDIO_FORMAT_U32:
 255        break;
 256    default:
 257        invalid = 1;
 258        break;
 259    }
 260
 261    invalid |= as->freq <= 0;
 262    return invalid ? -1 : 0;
 263}
 264
 265static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as)
 266{
 267    int bits = 8, sign = 0;
 268
 269    switch (as->fmt) {
 270    case AUDIO_FORMAT_S8:
 271        sign = 1;
 272        /* fall through */
 273    case AUDIO_FORMAT_U8:
 274        break;
 275
 276    case AUDIO_FORMAT_S16:
 277        sign = 1;
 278        /* fall through */
 279    case AUDIO_FORMAT_U16:
 280        bits = 16;
 281        break;
 282
 283    case AUDIO_FORMAT_S32:
 284        sign = 1;
 285        /* fall through */
 286    case AUDIO_FORMAT_U32:
 287        bits = 32;
 288        break;
 289
 290    default:
 291        abort();
 292    }
 293    return info->freq == as->freq
 294        && info->nchannels == as->nchannels
 295        && info->sign == sign
 296        && info->bits == bits
 297        && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS);
 298}
 299
 300void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as)
 301{
 302    int bits = 8, sign = 0, mul;
 303
 304    switch (as->fmt) {
 305    case AUDIO_FORMAT_S8:
 306        sign = 1;
 307    case AUDIO_FORMAT_U8:
 308        mul = 1;
 309        break;
 310
 311    case AUDIO_FORMAT_S16:
 312        sign = 1;
 313        /* fall through */
 314    case AUDIO_FORMAT_U16:
 315        bits = 16;
 316        mul = 2;
 317        break;
 318
 319    case AUDIO_FORMAT_S32:
 320        sign = 1;
 321        /* fall through */
 322    case AUDIO_FORMAT_U32:
 323        bits = 32;
 324        mul = 4;
 325        break;
 326
 327    default:
 328        abort();
 329    }
 330
 331    info->freq = as->freq;
 332    info->bits = bits;
 333    info->sign = sign;
 334    info->nchannels = as->nchannels;
 335    info->bytes_per_frame = as->nchannels * mul;
 336    info->bytes_per_second = info->freq * info->bytes_per_frame;
 337    info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS);
 338}
 339
 340void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len)
 341{
 342    if (!len) {
 343        return;
 344    }
 345
 346    if (info->sign) {
 347        memset(buf, 0x00, len * info->bytes_per_frame);
 348    }
 349    else {
 350        switch (info->bits) {
 351        case 8:
 352            memset(buf, 0x80, len * info->bytes_per_frame);
 353            break;
 354
 355        case 16:
 356            {
 357                int i;
 358                uint16_t *p = buf;
 359                short s = INT16_MAX;
 360
 361                if (info->swap_endianness) {
 362                    s = bswap16 (s);
 363                }
 364
 365                for (i = 0; i < len * info->nchannels; i++) {
 366                    p[i] = s;
 367                }
 368            }
 369            break;
 370
 371        case 32:
 372            {
 373                int i;
 374                uint32_t *p = buf;
 375                int32_t s = INT32_MAX;
 376
 377                if (info->swap_endianness) {
 378                    s = bswap32 (s);
 379                }
 380
 381                for (i = 0; i < len * info->nchannels; i++) {
 382                    p[i] = s;
 383                }
 384            }
 385            break;
 386
 387        default:
 388            AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n",
 389                     info->bits);
 390            break;
 391        }
 392    }
 393}
 394
 395/*
 396 * Capture
 397 */
 398static void noop_conv (struct st_sample *dst, const void *src, int samples)
 399{
 400    (void) src;
 401    (void) dst;
 402    (void) samples;
 403}
 404
 405static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
 406                                                        struct audsettings *as)
 407{
 408    CaptureVoiceOut *cap;
 409
 410    for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 411        if (audio_pcm_info_eq (&cap->hw.info, as)) {
 412            return cap;
 413        }
 414    }
 415    return NULL;
 416}
 417
 418static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd)
 419{
 420    struct capture_callback *cb;
 421
 422#ifdef DEBUG_CAPTURE
 423    dolog ("notification %d sent\n", cmd);
 424#endif
 425    for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
 426        cb->ops.notify (cb->opaque, cmd);
 427    }
 428}
 429
 430static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled)
 431{
 432    if (cap->hw.enabled != enabled) {
 433        audcnotification_e cmd;
 434        cap->hw.enabled = enabled;
 435        cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE;
 436        audio_notify_capture (cap, cmd);
 437    }
 438}
 439
 440static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap)
 441{
 442    HWVoiceOut *hw = &cap->hw;
 443    SWVoiceOut *sw;
 444    int enabled = 0;
 445
 446    for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 447        if (sw->active) {
 448            enabled = 1;
 449            break;
 450        }
 451    }
 452    audio_capture_maybe_changed (cap, enabled);
 453}
 454
 455static void audio_detach_capture (HWVoiceOut *hw)
 456{
 457    SWVoiceCap *sc = hw->cap_head.lh_first;
 458
 459    while (sc) {
 460        SWVoiceCap *sc1 = sc->entries.le_next;
 461        SWVoiceOut *sw = &sc->sw;
 462        CaptureVoiceOut *cap = sc->cap;
 463        int was_active = sw->active;
 464
 465        if (sw->rate) {
 466            st_rate_stop (sw->rate);
 467            sw->rate = NULL;
 468        }
 469
 470        QLIST_REMOVE (sw, entries);
 471        QLIST_REMOVE (sc, entries);
 472        g_free (sc);
 473        if (was_active) {
 474            /* We have removed soft voice from the capture:
 475               this might have changed the overall status of the capture
 476               since this might have been the only active voice */
 477            audio_recalc_and_notify_capture (cap);
 478        }
 479        sc = sc1;
 480    }
 481}
 482
 483static int audio_attach_capture (HWVoiceOut *hw)
 484{
 485    AudioState *s = hw->s;
 486    CaptureVoiceOut *cap;
 487
 488    audio_detach_capture (hw);
 489    for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
 490        SWVoiceCap *sc;
 491        SWVoiceOut *sw;
 492        HWVoiceOut *hw_cap = &cap->hw;
 493
 494        sc = g_malloc0(sizeof(*sc));
 495
 496        sc->cap = cap;
 497        sw = &sc->sw;
 498        sw->hw = hw_cap;
 499        sw->info = hw->info;
 500        sw->empty = 1;
 501        sw->active = hw->enabled;
 502        sw->conv = noop_conv;
 503        sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
 504        sw->vol = nominal_volume;
 505        sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
 506        if (!sw->rate) {
 507            dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw));
 508            g_free (sw);
 509            return -1;
 510        }
 511        QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
 512        QLIST_INSERT_HEAD (&hw->cap_head, sc, entries);
 513#ifdef DEBUG_CAPTURE
 514        sw->name = g_strdup_printf ("for %p %d,%d,%d",
 515                                    hw, sw->info.freq, sw->info.bits,
 516                                    sw->info.nchannels);
 517        dolog ("Added %s active = %d\n", sw->name, sw->active);
 518#endif
 519        if (sw->active) {
 520            audio_capture_maybe_changed (cap, 1);
 521        }
 522    }
 523    return 0;
 524}
 525
 526/*
 527 * Hard voice (capture)
 528 */
 529static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 530{
 531    SWVoiceIn *sw;
 532    size_t m = hw->total_samples_captured;
 533
 534    for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 535        if (sw->active) {
 536            m = MIN (m, sw->total_hw_samples_acquired);
 537        }
 538    }
 539    return m;
 540}
 541
 542static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw)
 543{
 544    size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 545    if (audio_bug(__func__, live > hw->conv_buf->size)) {
 546        dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 547        return 0;
 548    }
 549    return live;
 550}
 551
 552static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 553{
 554    size_t clipped = 0;
 555    size_t pos = hw->mix_buf->pos;
 556
 557    while (len) {
 558        st_sample *src = hw->mix_buf->samples + pos;
 559        uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
 560        size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
 561        size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 562
 563        hw->clip(dst, src, samples_to_clip);
 564
 565        pos = (pos + samples_to_clip) % hw->mix_buf->size;
 566        len -= samples_to_clip;
 567        clipped += samples_to_clip;
 568    }
 569}
 570
 571/*
 572 * Soft voice (capture)
 573 */
 574static size_t audio_pcm_sw_get_rpos_in(SWVoiceIn *sw)
 575{
 576    HWVoiceIn *hw = sw->hw;
 577    ssize_t live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 578    ssize_t rpos;
 579
 580    if (audio_bug(__func__, live < 0 || live > hw->conv_buf->size)) {
 581        dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 582        return 0;
 583    }
 584
 585    rpos = hw->conv_buf->pos - live;
 586    if (rpos >= 0) {
 587        return rpos;
 588    }
 589    else {
 590        return hw->conv_buf->size + rpos;
 591    }
 592}
 593
 594static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size)
 595{
 596    HWVoiceIn *hw = sw->hw;
 597    size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 598    struct st_sample *src, *dst = sw->buf;
 599
 600    rpos = audio_pcm_sw_get_rpos_in(sw) % hw->conv_buf->size;
 601
 602    live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 603    if (audio_bug(__func__, live > hw->conv_buf->size)) {
 604        dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size);
 605        return 0;
 606    }
 607
 608    samples = size / sw->info.bytes_per_frame;
 609    if (!live) {
 610        return 0;
 611    }
 612
 613    swlim = (live * sw->ratio) >> 32;
 614    swlim = MIN (swlim, samples);
 615
 616    while (swlim) {
 617        src = hw->conv_buf->samples + rpos;
 618        if (hw->conv_buf->pos > rpos) {
 619            isamp = hw->conv_buf->pos - rpos;
 620        } else {
 621            isamp = hw->conv_buf->size - rpos;
 622        }
 623
 624        if (!isamp) {
 625            break;
 626        }
 627        osamp = swlim;
 628
 629        st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 630        swlim -= osamp;
 631        rpos = (rpos + isamp) % hw->conv_buf->size;
 632        dst += osamp;
 633        ret += osamp;
 634        total += isamp;
 635    }
 636
 637    if (!hw->pcm_ops->volume_in) {
 638        mixeng_volume (sw->buf, ret, &sw->vol);
 639    }
 640
 641    sw->clip (buf, sw->buf, ret);
 642    sw->total_hw_samples_acquired += total;
 643    return ret * sw->info.bytes_per_frame;
 644}
 645
 646/*
 647 * Hard voice (playback)
 648 */
 649static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 650{
 651    SWVoiceOut *sw;
 652    size_t m = SIZE_MAX;
 653    int nb_live = 0;
 654
 655    for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 656        if (sw->active || !sw->empty) {
 657            m = MIN (m, sw->total_hw_samples_mixed);
 658            nb_live += 1;
 659        }
 660    }
 661
 662    *nb_livep = nb_live;
 663    return m;
 664}
 665
 666static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live)
 667{
 668    size_t smin;
 669    int nb_live1;
 670
 671    smin = audio_pcm_hw_find_min_out (hw, &nb_live1);
 672    if (nb_live) {
 673        *nb_live = nb_live1;
 674    }
 675
 676    if (nb_live1) {
 677        size_t live = smin;
 678
 679        if (audio_bug(__func__, live > hw->mix_buf->size)) {
 680            dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
 681            return 0;
 682        }
 683        return live;
 684    }
 685    return 0;
 686}
 687
 688/*
 689 * Soft voice (playback)
 690 */
 691static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size)
 692{
 693    size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 694    size_t ret = 0, pos = 0, total = 0;
 695
 696    if (!sw) {
 697        return size;
 698    }
 699
 700    hwsamples = sw->hw->mix_buf->size;
 701
 702    live = sw->total_hw_samples_mixed;
 703    if (audio_bug(__func__, live > hwsamples)) {
 704        dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples);
 705        return 0;
 706    }
 707
 708    if (live == hwsamples) {
 709#ifdef DEBUG_OUT
 710        dolog ("%s is full %d\n", sw->name, live);
 711#endif
 712        return 0;
 713    }
 714
 715    wpos = (sw->hw->mix_buf->pos + live) % hwsamples;
 716    samples = size / sw->info.bytes_per_frame;
 717
 718    dead = hwsamples - live;
 719    swlim = ((int64_t) dead << 32) / sw->ratio;
 720    swlim = MIN (swlim, samples);
 721    if (swlim) {
 722        sw->conv (sw->buf, buf, swlim);
 723
 724        if (!sw->hw->pcm_ops->volume_out) {
 725            mixeng_volume (sw->buf, swlim, &sw->vol);
 726        }
 727    }
 728
 729    while (swlim) {
 730        dead = hwsamples - live;
 731        left = hwsamples - wpos;
 732        blck = MIN (dead, left);
 733        if (!blck) {
 734            break;
 735        }
 736        isamp = swlim;
 737        osamp = blck;
 738        st_rate_flow_mix (
 739            sw->rate,
 740            sw->buf + pos,
 741            sw->hw->mix_buf->samples + wpos,
 742            &isamp,
 743            &osamp
 744            );
 745        ret += isamp;
 746        swlim -= isamp;
 747        pos += isamp;
 748        live += osamp;
 749        wpos = (wpos + osamp) % hwsamples;
 750        total += osamp;
 751    }
 752
 753    sw->total_hw_samples_mixed += total;
 754    sw->empty = sw->total_hw_samples_mixed == 0;
 755
 756#ifdef DEBUG_OUT
 757    dolog (
 758        "%s: write size %zu ret %zu total sw %zu\n",
 759        SW_NAME (sw),
 760        size / sw->info.bytes_per_frame,
 761        ret,
 762        sw->total_hw_samples_mixed
 763        );
 764#endif
 765
 766    return ret * sw->info.bytes_per_frame;
 767}
 768
 769#ifdef DEBUG_AUDIO
 770static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 771{
 772    dolog ("%s: bits %d, sign %d, freq %d, nchan %d\n",
 773           cap, info->bits, info->sign, info->freq, info->nchannels);
 774}
 775#endif
 776
 777#define DAC
 778#include "audio_template.h"
 779#undef DAC
 780#include "audio_template.h"
 781
 782/*
 783 * Timer
 784 */
 785static 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
 799static 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
 818static 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 */
 837size_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
 859size_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
 881int AUD_get_buffer_size_out (SWVoiceOut *sw)
 882{
 883    return sw->hw->mix_buf->size * sw->hw->info.bytes_per_frame;
 884}
 885
 886void 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
 935void 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
 981static 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
1005static 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
1033static 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
1071static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
1072{
1073    size_t clipped = 0;
1074
1075    while (live) {
1076        size_t size, decr, proc;
1077        void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
1078        if (!buf) {
1079            /* retrying will likely won't help, drop everything. */
1080            hw->mix_buf->pos = (hw->mix_buf->pos + live) % hw->mix_buf->size;
1081            return clipped + live;
1082        }
1083
1084        decr = MIN(size / hw->info.bytes_per_frame, live);
1085        audio_pcm_hw_clip_out(hw, buf, decr);
1086        proc = hw->pcm_ops->put_buffer_out(hw, buf,
1087                                           decr * hw->info.bytes_per_frame) /
1088            hw->info.bytes_per_frame;
1089
1090        live -= proc;
1091        clipped += proc;
1092        hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size;
1093
1094        if (proc == 0 || proc < decr) {
1095            break;
1096        }
1097    }
1098
1099    return clipped;
1100}
1101
1102static void audio_run_out (AudioState *s)
1103{
1104    HWVoiceOut *hw = NULL;
1105    SWVoiceOut *sw;
1106
1107    if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1108        while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1109            /* there is exactly 1 sw for each hw with no mixeng */
1110            sw = hw->sw_head.lh_first;
1111
1112            if (hw->pending_disable) {
1113                hw->enabled = 0;
1114                hw->pending_disable = 0;
1115                if (hw->pcm_ops->enable_out) {
1116                    hw->pcm_ops->enable_out(hw, false);
1117                }
1118            }
1119
1120            if (sw->active) {
1121                sw->callback.fn(sw->callback.opaque, INT_MAX);
1122            }
1123        }
1124        return;
1125    }
1126
1127    while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
1128        size_t played, live, prev_rpos, free;
1129        int nb_live, cleanup_required;
1130
1131        live = audio_pcm_hw_get_live_out (hw, &nb_live);
1132        if (!nb_live) {
1133            live = 0;
1134        }
1135
1136        if (audio_bug(__func__, live > hw->mix_buf->size)) {
1137            dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size);
1138            continue;
1139        }
1140
1141        if (hw->pending_disable && !nb_live) {
1142            SWVoiceCap *sc;
1143#ifdef DEBUG_OUT
1144            dolog ("Disabling voice\n");
1145#endif
1146            hw->enabled = 0;
1147            hw->pending_disable = 0;
1148            if (hw->pcm_ops->enable_out) {
1149                hw->pcm_ops->enable_out(hw, false);
1150            }
1151            for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1152                sc->sw.active = 0;
1153                audio_recalc_and_notify_capture (sc->cap);
1154            }
1155            continue;
1156        }
1157
1158        if (!live) {
1159            for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1160                if (sw->active) {
1161                    free = audio_get_free (sw);
1162                    if (free > 0) {
1163                        sw->callback.fn (sw->callback.opaque, free);
1164                    }
1165                }
1166            }
1167            continue;
1168        }
1169
1170        prev_rpos = hw->mix_buf->pos;
1171        played = audio_pcm_hw_run_out(hw, live);
1172        replay_audio_out(&played);
1173        if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) {
1174            dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n",
1175                  hw->mix_buf->pos, hw->mix_buf->size, played);
1176            hw->mix_buf->pos = 0;
1177        }
1178
1179#ifdef DEBUG_OUT
1180        dolog("played=%zu\n", played);
1181#endif
1182
1183        if (played) {
1184            hw->ts_helper += played;
1185            audio_capture_mix_and_clear (hw, prev_rpos, played);
1186        }
1187
1188        cleanup_required = 0;
1189        for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1190            if (!sw->active && sw->empty) {
1191                continue;
1192            }
1193
1194            if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) {
1195                dolog("played=%zu sw->total_hw_samples_mixed=%zu\n",
1196                      played, sw->total_hw_samples_mixed);
1197                played = sw->total_hw_samples_mixed;
1198            }
1199
1200            sw->total_hw_samples_mixed -= played;
1201
1202            if (!sw->total_hw_samples_mixed) {
1203                sw->empty = 1;
1204                cleanup_required |= !sw->active && !sw->callback.fn;
1205            }
1206
1207            if (sw->active) {
1208                free = audio_get_free (sw);
1209                if (free > 0) {
1210                    sw->callback.fn (sw->callback.opaque, free);
1211                }
1212            }
1213        }
1214
1215        if (cleanup_required) {
1216            SWVoiceOut *sw1;
1217
1218            sw = hw->sw_head.lh_first;
1219            while (sw) {
1220                sw1 = sw->entries.le_next;
1221                if (!sw->active && !sw->callback.fn) {
1222                    audio_close_out (sw);
1223                }
1224                sw = sw1;
1225            }
1226        }
1227    }
1228}
1229
1230static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
1231{
1232    size_t conv = 0;
1233    STSampleBuffer *conv_buf = hw->conv_buf;
1234
1235    while (samples) {
1236        size_t proc;
1237        size_t size = samples * hw->info.bytes_per_frame;
1238        void *buf = hw->pcm_ops->get_buffer_in(hw, &size);
1239
1240        assert(size % hw->info.bytes_per_frame == 0);
1241        if (size == 0) {
1242            hw->pcm_ops->put_buffer_in(hw, buf, size);
1243            break;
1244        }
1245
1246        proc = MIN(size / hw->info.bytes_per_frame,
1247                   conv_buf->size - conv_buf->pos);
1248
1249        hw->conv(conv_buf->samples + conv_buf->pos, buf, proc);
1250        conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size;
1251
1252        samples -= proc;
1253        conv += proc;
1254        hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame);
1255    }
1256
1257    return conv;
1258}
1259
1260static void audio_run_in (AudioState *s)
1261{
1262    HWVoiceIn *hw = NULL;
1263
1264    if (!audio_get_pdo_in(s->dev)->mixing_engine) {
1265        while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1266            /* there is exactly 1 sw for each hw with no mixeng */
1267            SWVoiceIn *sw = hw->sw_head.lh_first;
1268            if (sw->active) {
1269                sw->callback.fn(sw->callback.opaque, INT_MAX);
1270            }
1271        }
1272        return;
1273    }
1274
1275    while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
1276        SWVoiceIn *sw;
1277        size_t captured = 0, min;
1278
1279        if (replay_mode != REPLAY_MODE_PLAY) {
1280            captured = audio_pcm_hw_run_in(
1281                hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw));
1282        }
1283        replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos,
1284                        hw->conv_buf->size);
1285
1286        min = audio_pcm_hw_find_min_in (hw);
1287        hw->total_samples_captured += captured - min;
1288        hw->ts_helper += captured;
1289
1290        for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1291            sw->total_hw_samples_acquired -= min;
1292
1293            if (sw->active) {
1294                size_t avail;
1295
1296                avail = audio_get_avail (sw);
1297                if (avail > 0) {
1298                    sw->callback.fn (sw->callback.opaque, avail);
1299                }
1300            }
1301        }
1302    }
1303}
1304
1305static void audio_run_capture (AudioState *s)
1306{
1307    CaptureVoiceOut *cap;
1308
1309    for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
1310        size_t live, rpos, captured;
1311        HWVoiceOut *hw = &cap->hw;
1312        SWVoiceOut *sw;
1313
1314        captured = live = audio_pcm_hw_get_live_out (hw, NULL);
1315        rpos = hw->mix_buf->pos;
1316        while (live) {
1317            size_t left = hw->mix_buf->size - rpos;
1318            size_t to_capture = MIN(live, left);
1319            struct st_sample *src;
1320            struct capture_callback *cb;
1321
1322            src = hw->mix_buf->samples + rpos;
1323            hw->clip (cap->buf, src, to_capture);
1324            mixeng_clear (src, to_capture);
1325
1326            for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1327                cb->ops.capture (cb->opaque, cap->buf,
1328                                 to_capture * hw->info.bytes_per_frame);
1329            }
1330            rpos = (rpos + to_capture) % hw->mix_buf->size;
1331            live -= to_capture;
1332        }
1333        hw->mix_buf->pos = rpos;
1334
1335        for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1336            if (!sw->active && sw->empty) {
1337                continue;
1338            }
1339
1340            if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) {
1341                dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n",
1342                      captured, sw->total_hw_samples_mixed);
1343                captured = sw->total_hw_samples_mixed;
1344            }
1345
1346            sw->total_hw_samples_mixed -= captured;
1347            sw->empty = sw->total_hw_samples_mixed == 0;
1348        }
1349    }
1350}
1351
1352void audio_run(AudioState *s, const char *msg)
1353{
1354    audio_run_out(s);
1355    audio_run_in(s);
1356    audio_run_capture(s);
1357
1358#ifdef DEBUG_POLL
1359    {
1360        static double prevtime;
1361        double currtime;
1362        struct timeval tv;
1363
1364        if (gettimeofday (&tv, NULL)) {
1365            perror ("audio_run: gettimeofday");
1366            return;
1367        }
1368
1369        currtime = tv.tv_sec + tv.tv_usec * 1e-6;
1370        dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime);
1371        prevtime = currtime;
1372    }
1373#endif
1374}
1375
1376void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size)
1377{
1378    ssize_t start;
1379
1380    if (unlikely(!hw->buf_emul)) {
1381        size_t calc_size = hw->conv_buf->size * hw->info.bytes_per_frame;
1382        hw->buf_emul = g_malloc(calc_size);
1383        hw->size_emul = calc_size;
1384        hw->pos_emul = hw->pending_emul = 0;
1385    }
1386
1387    while (hw->pending_emul < hw->size_emul) {
1388        size_t read_len = MIN(hw->size_emul - hw->pos_emul,
1389                              hw->size_emul - hw->pending_emul);
1390        size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul,
1391                                        read_len);
1392        hw->pending_emul += read;
1393        hw->pos_emul = (hw->pos_emul + read) % hw->size_emul;
1394        if (read < read_len) {
1395            break;
1396        }
1397    }
1398
1399    start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1400    if (start < 0) {
1401        start += hw->size_emul;
1402    }
1403    assert(start >= 0 && start < hw->size_emul);
1404
1405    *size = MIN(hw->pending_emul, hw->size_emul - start);
1406    return hw->buf_emul + start;
1407}
1408
1409void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size)
1410{
1411    assert(size <= hw->pending_emul);
1412    hw->pending_emul -= size;
1413}
1414
1415void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size)
1416{
1417    if (unlikely(!hw->buf_emul)) {
1418        size_t calc_size = hw->mix_buf->size * hw->info.bytes_per_frame;
1419
1420        hw->buf_emul = g_malloc(calc_size);
1421        hw->size_emul = calc_size;
1422        hw->pos_emul = hw->pending_emul = 0;
1423    }
1424
1425    *size = MIN(hw->size_emul - hw->pending_emul,
1426                hw->size_emul - hw->pos_emul);
1427    return hw->buf_emul + hw->pos_emul;
1428}
1429
1430size_t audio_generic_put_buffer_out_nowrite(HWVoiceOut *hw, void *buf,
1431                                            size_t size)
1432{
1433    assert(buf == hw->buf_emul + hw->pos_emul &&
1434           size + hw->pending_emul <= hw->size_emul);
1435
1436    hw->pending_emul += size;
1437    hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
1438
1439    return size;
1440}
1441
1442size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
1443{
1444    audio_generic_put_buffer_out_nowrite(hw, buf, size);
1445
1446    while (hw->pending_emul) {
1447        size_t write_len, written;
1448        ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
1449        if (start < 0) {
1450            start += hw->size_emul;
1451        }
1452        assert(start >= 0 && start < hw->size_emul);
1453
1454        write_len = MIN(hw->pending_emul, hw->size_emul - start);
1455
1456        written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len);
1457        hw->pending_emul -= written;
1458
1459        if (written < write_len) {
1460            break;
1461        }
1462    }
1463
1464    /*
1465     * fake we have written everything. non-written data remain in pending_emul,
1466     * so we do not have to clip them multiple times
1467     */
1468    return size;
1469}
1470
1471size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size)
1472{
1473    size_t dst_size, copy_size;
1474    void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size);
1475    copy_size = MIN(size, dst_size);
1476
1477    memcpy(dst, buf, copy_size);
1478    return hw->pcm_ops->put_buffer_out(hw, buf, copy_size);
1479}
1480
1481size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
1482{
1483    size_t dst_size, copy_size;
1484    void *dst = hw->pcm_ops->get_buffer_in(hw, &dst_size);
1485    copy_size = MIN(size, dst_size);
1486
1487    memcpy(dst, buf, copy_size);
1488    hw->pcm_ops->put_buffer_in(hw, buf, copy_size);
1489    return copy_size;
1490}
1491
1492
1493static int audio_driver_init(AudioState *s, struct audio_driver *drv,
1494                             bool msg, Audiodev *dev)
1495{
1496    s->drv_opaque = drv->init(dev);
1497
1498    if (s->drv_opaque) {
1499        if (!drv->pcm_ops->get_buffer_in) {
1500            drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in;
1501            drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in;
1502        }
1503        if (!drv->pcm_ops->get_buffer_out) {
1504            drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out;
1505            drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out;
1506        }
1507
1508        audio_init_nb_voices_out(s, drv);
1509        audio_init_nb_voices_in(s, drv);
1510        s->drv = drv;
1511        return 0;
1512    }
1513    else {
1514        if (msg) {
1515            dolog("Could not init `%s' audio driver\n", drv->name);
1516        }
1517        return -1;
1518    }
1519}
1520
1521static void audio_vm_change_state_handler (void *opaque, int running,
1522                                           RunState state)
1523{
1524    AudioState *s = opaque;
1525    HWVoiceOut *hwo = NULL;
1526    HWVoiceIn *hwi = NULL;
1527
1528    s->vm_running = running;
1529    while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
1530        if (hwo->pcm_ops->enable_out) {
1531            hwo->pcm_ops->enable_out(hwo, running);
1532        }
1533    }
1534
1535    while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
1536        if (hwi->pcm_ops->enable_in) {
1537            hwi->pcm_ops->enable_in(hwi, running);
1538        }
1539    }
1540    audio_reset_timer (s);
1541}
1542
1543static bool is_cleaning_up;
1544
1545bool audio_is_cleaning_up(void)
1546{
1547    return is_cleaning_up;
1548}
1549
1550static void free_audio_state(AudioState *s)
1551{
1552    HWVoiceOut *hwo, *hwon;
1553    HWVoiceIn *hwi, *hwin;
1554
1555    QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
1556        SWVoiceCap *sc;
1557
1558        if (hwo->enabled && hwo->pcm_ops->enable_out) {
1559            hwo->pcm_ops->enable_out(hwo, false);
1560        }
1561        hwo->pcm_ops->fini_out (hwo);
1562
1563        for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) {
1564            CaptureVoiceOut *cap = sc->cap;
1565            struct capture_callback *cb;
1566
1567            for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1568                cb->ops.destroy (cb->opaque);
1569            }
1570        }
1571        QLIST_REMOVE(hwo, entries);
1572    }
1573
1574    QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
1575        if (hwi->enabled && hwi->pcm_ops->enable_in) {
1576            hwi->pcm_ops->enable_in(hwi, false);
1577        }
1578        hwi->pcm_ops->fini_in (hwi);
1579        QLIST_REMOVE(hwi, entries);
1580    }
1581
1582    if (s->drv) {
1583        s->drv->fini (s->drv_opaque);
1584        s->drv = NULL;
1585    }
1586
1587    if (s->dev) {
1588        qapi_free_Audiodev(s->dev);
1589        s->dev = NULL;
1590    }
1591
1592    if (s->ts) {
1593        timer_free(s->ts);
1594        s->ts = NULL;
1595    }
1596
1597    g_free(s);
1598}
1599
1600void audio_cleanup(void)
1601{
1602    is_cleaning_up = true;
1603    while (!QTAILQ_EMPTY(&audio_states)) {
1604        AudioState *s = QTAILQ_FIRST(&audio_states);
1605        QTAILQ_REMOVE(&audio_states, s, list);
1606        free_audio_state(s);
1607    }
1608}
1609
1610static const VMStateDescription vmstate_audio = {
1611    .name = "audio",
1612    .version_id = 1,
1613    .minimum_version_id = 1,
1614    .fields = (VMStateField[]) {
1615        VMSTATE_END_OF_LIST()
1616    }
1617};
1618
1619static void audio_validate_opts(Audiodev *dev, Error **errp);
1620
1621static AudiodevListEntry *audiodev_find(
1622    AudiodevListHead *head, const char *drvname)
1623{
1624    AudiodevListEntry *e;
1625    QSIMPLEQ_FOREACH(e, head, next) {
1626        if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) {
1627            return e;
1628        }
1629    }
1630
1631    return NULL;
1632}
1633
1634/*
1635 * if we have dev, this function was called because of an -audiodev argument =>
1636 *   initialize a new state with it
1637 * if dev == NULL => legacy implicit initialization, return the already created
1638 *   state or create a new one
1639 */
1640static AudioState *audio_init(Audiodev *dev, const char *name)
1641{
1642    static bool atexit_registered;
1643    size_t i;
1644    int done = 0;
1645    const char *drvname = NULL;
1646    VMChangeStateEntry *e;
1647    AudioState *s;
1648    struct audio_driver *driver;
1649    /* silence gcc warning about uninitialized variable */
1650    AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head);
1651
1652    if (dev) {
1653        /* -audiodev option */
1654        legacy_config = false;
1655        drvname = AudiodevDriver_str(dev->driver);
1656    } else if (!QTAILQ_EMPTY(&audio_states)) {
1657        if (!legacy_config) {
1658            dolog("Device %s: audiodev default parameter is deprecated, please "
1659                  "specify audiodev=%s\n", name,
1660                  QTAILQ_FIRST(&audio_states)->dev->id);
1661        }
1662        return QTAILQ_FIRST(&audio_states);
1663    } else {
1664        /* legacy implicit initialization */
1665        head = audio_handle_legacy_opts();
1666        /*
1667         * In case of legacy initialization, all Audiodevs in the list will have
1668         * the same configuration (except the driver), so it does't matter which
1669         * one we chose.  We need an Audiodev to set up AudioState before we can
1670         * init a driver.  Also note that dev at this point is still in the
1671         * list.
1672         */
1673        dev = QSIMPLEQ_FIRST(&head)->dev;
1674        audio_validate_opts(dev, &error_abort);
1675    }
1676
1677    s = g_malloc0(sizeof(AudioState));
1678    s->dev = dev;
1679
1680    QLIST_INIT (&s->hw_head_out);
1681    QLIST_INIT (&s->hw_head_in);
1682    QLIST_INIT (&s->cap_head);
1683    if (!atexit_registered) {
1684        atexit(audio_cleanup);
1685        atexit_registered = true;
1686    }
1687    QTAILQ_INSERT_TAIL(&audio_states, s, list);
1688
1689    s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
1690
1691    s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices;
1692    s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices;
1693
1694    if (s->nb_hw_voices_out <= 0) {
1695        dolog ("Bogus number of playback voices %d, setting to 1\n",
1696               s->nb_hw_voices_out);
1697        s->nb_hw_voices_out = 1;
1698    }
1699
1700    if (s->nb_hw_voices_in <= 0) {
1701        dolog ("Bogus number of capture voices %d, setting to 0\n",
1702               s->nb_hw_voices_in);
1703        s->nb_hw_voices_in = 0;
1704    }
1705
1706    if (drvname) {
1707        driver = audio_driver_lookup(drvname);
1708        if (driver) {
1709            done = !audio_driver_init(s, driver, true, dev);
1710        } else {
1711            dolog ("Unknown audio driver `%s'\n", drvname);
1712        }
1713    } else {
1714        for (i = 0; audio_prio_list[i]; i++) {
1715            AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]);
1716            driver = audio_driver_lookup(audio_prio_list[i]);
1717
1718            if (e && driver) {
1719                s->dev = dev = e->dev;
1720                audio_validate_opts(dev, &error_abort);
1721                done = !audio_driver_init(s, driver, false, dev);
1722                if (done) {
1723                    e->dev = NULL;
1724                    break;
1725                }
1726            }
1727        }
1728    }
1729    audio_free_audiodev_list(&head);
1730
1731    if (!done) {
1732        driver = audio_driver_lookup("none");
1733        done = !audio_driver_init(s, driver, false, dev);
1734        assert(done);
1735        dolog("warning: Using timer based audio emulation\n");
1736    }
1737
1738    if (dev->timer_period <= 0) {
1739        s->period_ticks = 1;
1740    } else {
1741        s->period_ticks = dev->timer_period * SCALE_US;
1742    }
1743
1744    e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1745    if (!e) {
1746        dolog ("warning: Could not register change state handler\n"
1747               "(Audio can continue looping even after stopping the VM)\n");
1748    }
1749
1750    QLIST_INIT (&s->card_head);
1751    vmstate_register (NULL, 0, &vmstate_audio, s);
1752    return s;
1753}
1754
1755void audio_free_audiodev_list(AudiodevListHead *head)
1756{
1757    AudiodevListEntry *e;
1758    while ((e = QSIMPLEQ_FIRST(head))) {
1759        QSIMPLEQ_REMOVE_HEAD(head, next);
1760        qapi_free_Audiodev(e->dev);
1761        g_free(e);
1762    }
1763}
1764
1765void AUD_register_card (const char *name, QEMUSoundCard *card)
1766{
1767    if (!card->state) {
1768        card->state = audio_init(NULL, name);
1769    }
1770
1771    card->name = g_strdup (name);
1772    memset (&card->entries, 0, sizeof (card->entries));
1773    QLIST_INSERT_HEAD(&card->state->card_head, card, entries);
1774}
1775
1776void AUD_remove_card (QEMUSoundCard *card)
1777{
1778    QLIST_REMOVE (card, entries);
1779    g_free (card->name);
1780}
1781
1782
1783CaptureVoiceOut *AUD_add_capture(
1784    AudioState *s,
1785    struct audsettings *as,
1786    struct audio_capture_ops *ops,
1787    void *cb_opaque
1788    )
1789{
1790    CaptureVoiceOut *cap;
1791    struct capture_callback *cb;
1792
1793    if (!s) {
1794        if (!legacy_config) {
1795            dolog("Capturing without setting an audiodev is deprecated\n");
1796        }
1797        s = audio_init(NULL, NULL);
1798    }
1799
1800    if (!audio_get_pdo_out(s->dev)->mixing_engine) {
1801        dolog("Can't capture with mixeng disabled\n");
1802        return NULL;
1803    }
1804
1805    if (audio_validate_settings (as)) {
1806        dolog ("Invalid settings were passed when trying to add capture\n");
1807        audio_print_settings (as);
1808        return NULL;
1809    }
1810
1811    cb = g_malloc0(sizeof(*cb));
1812    cb->ops = *ops;
1813    cb->opaque = cb_opaque;
1814
1815    cap = audio_pcm_capture_find_specific(s, as);
1816    if (cap) {
1817        QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1818        return cap;
1819    }
1820    else {
1821        HWVoiceOut *hw;
1822        CaptureVoiceOut *cap;
1823
1824        cap = g_malloc0(sizeof(*cap));
1825
1826        hw = &cap->hw;
1827        hw->s = s;
1828        QLIST_INIT (&hw->sw_head);
1829        QLIST_INIT (&cap->cb_head);
1830
1831        /* XXX find a more elegant way */
1832        hw->samples = 4096 * 4;
1833        audio_pcm_hw_alloc_resources_out(hw);
1834
1835        audio_pcm_init_info (&hw->info, as);
1836
1837        cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame);
1838
1839        hw->clip = mixeng_clip
1840            [hw->info.nchannels == 2]
1841            [hw->info.sign]
1842            [hw->info.swap_endianness]
1843            [audio_bits_to_index (hw->info.bits)];
1844
1845        QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
1846        QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
1847
1848        QLIST_FOREACH(hw, &s->hw_head_out, entries) {
1849            audio_attach_capture (hw);
1850        }
1851        return cap;
1852    }
1853}
1854
1855void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque)
1856{
1857    struct capture_callback *cb;
1858
1859    for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) {
1860        if (cb->opaque == cb_opaque) {
1861            cb->ops.destroy (cb_opaque);
1862            QLIST_REMOVE (cb, entries);
1863            g_free (cb);
1864
1865            if (!cap->cb_head.lh_first) {
1866                SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1;
1867
1868                while (sw) {
1869                    SWVoiceCap *sc = (SWVoiceCap *) sw;
1870#ifdef DEBUG_CAPTURE
1871                    dolog ("freeing %s\n", sw->name);
1872#endif
1873
1874                    sw1 = sw->entries.le_next;
1875                    if (sw->rate) {
1876                        st_rate_stop (sw->rate);
1877                        sw->rate = NULL;
1878                    }
1879                    QLIST_REMOVE (sw, entries);
1880                    QLIST_REMOVE (sc, entries);
1881                    g_free (sc);
1882                    sw = sw1;
1883                }
1884                QLIST_REMOVE (cap, entries);
1885                g_free (cap->hw.mix_buf);
1886                g_free (cap->buf);
1887                g_free (cap);
1888            }
1889            return;
1890        }
1891    }
1892}
1893
1894void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol)
1895{
1896    Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1897    audio_set_volume_out(sw, &vol);
1898}
1899
1900void audio_set_volume_out(SWVoiceOut *sw, Volume *vol)
1901{
1902    if (sw) {
1903        HWVoiceOut *hw = sw->hw;
1904
1905        sw->vol.mute = vol->mute;
1906        sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1907        sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] /
1908            255;
1909
1910        if (hw->pcm_ops->volume_out) {
1911            hw->pcm_ops->volume_out(hw, vol);
1912        }
1913    }
1914}
1915
1916void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol)
1917{
1918    Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } };
1919    audio_set_volume_in(sw, &vol);
1920}
1921
1922void audio_set_volume_in(SWVoiceIn *sw, Volume *vol)
1923{
1924    if (sw) {
1925        HWVoiceIn *hw = sw->hw;
1926
1927        sw->vol.mute = vol->mute;
1928        sw->vol.l = nominal_volume.l * vol->vol[0] / 255;
1929        sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] /
1930            255;
1931
1932        if (hw->pcm_ops->volume_in) {
1933            hw->pcm_ops->volume_in(hw, vol);
1934        }
1935    }
1936}
1937
1938void audio_create_pdos(Audiodev *dev)
1939{
1940    switch (dev->driver) {
1941#define CASE(DRIVER, driver, pdo_name)                              \
1942    case AUDIODEV_DRIVER_##DRIVER:                                  \
1943        if (!dev->u.driver.has_in) {                                \
1944            dev->u.driver.in = g_malloc0(                           \
1945                sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1946            dev->u.driver.has_in = true;                            \
1947        }                                                           \
1948        if (!dev->u.driver.has_out) {                               \
1949            dev->u.driver.out = g_malloc0(                          \
1950                sizeof(Audiodev##pdo_name##PerDirectionOptions));   \
1951            dev->u.driver.has_out = true;                           \
1952        }                                                           \
1953        break
1954
1955        CASE(NONE, none, );
1956        CASE(ALSA, alsa, Alsa);
1957        CASE(COREAUDIO, coreaudio, Coreaudio);
1958        CASE(DSOUND, dsound, );
1959        CASE(OSS, oss, Oss);
1960        CASE(PA, pa, Pa);
1961        CASE(SDL, sdl, );
1962        CASE(SPICE, spice, );
1963        CASE(WAV, wav, );
1964
1965    case AUDIODEV_DRIVER__MAX:
1966        abort();
1967    };
1968}
1969
1970static void audio_validate_per_direction_opts(
1971    AudiodevPerDirectionOptions *pdo, Error **errp)
1972{
1973    if (!pdo->has_mixing_engine) {
1974        pdo->has_mixing_engine = true;
1975        pdo->mixing_engine = true;
1976    }
1977    if (!pdo->has_fixed_settings) {
1978        pdo->has_fixed_settings = true;
1979        pdo->fixed_settings = pdo->mixing_engine;
1980    }
1981    if (!pdo->fixed_settings &&
1982        (pdo->has_frequency || pdo->has_channels || pdo->has_format)) {
1983        error_setg(errp,
1984                   "You can't use frequency, channels or format with fixed-settings=off");
1985        return;
1986    }
1987    if (!pdo->mixing_engine && pdo->fixed_settings) {
1988        error_setg(errp, "You can't use fixed-settings without mixeng");
1989        return;
1990    }
1991
1992    if (!pdo->has_frequency) {
1993        pdo->has_frequency = true;
1994        pdo->frequency = 44100;
1995    }
1996    if (!pdo->has_channels) {
1997        pdo->has_channels = true;
1998        pdo->channels = 2;
1999    }
2000    if (!pdo->has_voices) {
2001        pdo->has_voices = true;
2002        pdo->voices = pdo->mixing_engine ? 1 : INT_MAX;
2003    }
2004    if (!pdo->has_format) {
2005        pdo->has_format = true;
2006        pdo->format = AUDIO_FORMAT_S16;
2007    }
2008}
2009
2010static void audio_validate_opts(Audiodev *dev, Error **errp)
2011{
2012    Error *err = NULL;
2013
2014    audio_create_pdos(dev);
2015
2016    audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err);
2017    if (err) {
2018        error_propagate(errp, err);
2019        return;
2020    }
2021
2022    audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err);
2023    if (err) {
2024        error_propagate(errp, err);
2025        return;
2026    }
2027
2028    if (!dev->has_timer_period) {
2029        dev->has_timer_period = true;
2030        dev->timer_period = 10000; /* 100Hz -> 10ms */
2031    }
2032}
2033
2034void audio_parse_option(const char *opt)
2035{
2036    AudiodevListEntry *e;
2037    Audiodev *dev = NULL;
2038
2039    Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal);
2040    visit_type_Audiodev(v, NULL, &dev, &error_fatal);
2041    visit_free(v);
2042
2043    audio_validate_opts(dev, &error_fatal);
2044
2045    e = g_malloc0(sizeof(AudiodevListEntry));
2046    e->dev = dev;
2047    QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next);
2048}
2049
2050void audio_init_audiodevs(void)
2051{
2052    AudiodevListEntry *e;
2053
2054    QSIMPLEQ_FOREACH(e, &audiodevs, next) {
2055        audio_init(e->dev, NULL);
2056    }
2057}
2058
2059audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo)
2060{
2061    return (audsettings) {
2062        .freq = pdo->frequency,
2063        .nchannels = pdo->channels,
2064        .fmt = pdo->format,
2065        .endianness = AUDIO_HOST_ENDIANNESS,
2066    };
2067}
2068
2069int audioformat_bytes_per_sample(AudioFormat fmt)
2070{
2071    switch (fmt) {
2072    case AUDIO_FORMAT_U8:
2073    case AUDIO_FORMAT_S8:
2074        return 1;
2075
2076    case AUDIO_FORMAT_U16:
2077    case AUDIO_FORMAT_S16:
2078        return 2;
2079
2080    case AUDIO_FORMAT_U32:
2081    case AUDIO_FORMAT_S32:
2082        return 4;
2083
2084    case AUDIO_FORMAT__MAX:
2085        ;
2086    }
2087    abort();
2088}
2089
2090
2091/* frames = freq * usec / 1e6 */
2092int audio_buffer_frames(AudiodevPerDirectionOptions *pdo,
2093                        audsettings *as, int def_usecs)
2094{
2095    uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs;
2096    return (as->freq * usecs + 500000) / 1000000;
2097}
2098
2099/* samples = channels * frames = channels * freq * usec / 1e6 */
2100int audio_buffer_samples(AudiodevPerDirectionOptions *pdo,
2101                         audsettings *as, int def_usecs)
2102{
2103    return as->nchannels * audio_buffer_frames(pdo, as, def_usecs);
2104}
2105
2106/*
2107 * bytes = bytes_per_sample * samples =
2108 *     bytes_per_sample * channels * freq * usec / 1e6
2109 */
2110int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo,
2111                       audsettings *as, int def_usecs)
2112{
2113    return audio_buffer_samples(pdo, as, def_usecs) *
2114        audioformat_bytes_per_sample(as->fmt);
2115}
2116
2117AudioState *audio_state_by_name(const char *name)
2118{
2119    AudioState *s;
2120    QTAILQ_FOREACH(s, &audio_states, list) {
2121        assert(s->dev);
2122        if (strcmp(name, s->dev->id) == 0) {
2123            return s;
2124        }
2125    }
2126    return NULL;
2127}
2128
2129const char *audio_get_id(QEMUSoundCard *card)
2130{
2131    if (card->state) {
2132        assert(card->state->dev);
2133        return card->state->dev->id;
2134    } else {
2135        return "";
2136    }
2137}
2138
2139void audio_rate_start(RateCtl *rate)
2140{
2141    memset(rate, 0, sizeof(RateCtl));
2142    rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2143}
2144
2145size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate,
2146                            size_t bytes_avail)
2147{
2148    int64_t now;
2149    int64_t ticks;
2150    int64_t bytes;
2151    int64_t samples;
2152    size_t ret;
2153
2154    now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2155    ticks = now - rate->start_ticks;
2156    bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND);
2157    samples = (bytes - rate->bytes_sent) / info->bytes_per_frame;
2158    if (samples < 0 || samples > 65536) {
2159        AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples);
2160        audio_rate_start(rate);
2161        samples = 0;
2162    }
2163
2164    ret = MIN(samples * info->bytes_per_frame, bytes_avail);
2165    rate->bytes_sent += ret;
2166    return ret;
2167}
2168