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 #include "vl.h"
  25
  26 #define AUDIO_CAP "audio"
  27 #include "audio_int.h"
  28
  29 /* #define DEBUG_PLIVE */
  30 /* #define DEBUG_LIVE */
  31 /* #define DEBUG_OUT */
  32
  33 #define SW_NAME(sw) (sw)->name ? (sw)->name : "unknown"
  34
  35 static struct audio_driver *drvtab[] = {
  36 #ifdef CONFIG_OSS
  37     &oss_audio_driver,
  38 #endif
  39 #ifdef CONFIG_ALSA
  40     &alsa_audio_driver,
  41 #endif
  42 #ifdef CONFIG_COREAUDIO
  43     &coreaudio_audio_driver,
  44 #endif
  45 #ifdef CONFIG_DSOUND
  46     &dsound_audio_driver,
  47 #endif
  48 #ifdef CONFIG_FMOD
  49     &fmod_audio_driver,
  50 #endif
  51 #ifdef CONFIG_SDL
  52     &sdl_audio_driver,
  53 #endif
  54     &no_audio_driver,
  55     &wav_audio_driver
  56 };
  57
  58 struct fixed_settings {
  59     int enabled;
  60     int nb_voices;
  61     int greedy;
  62     audsettings_t settings;
  63 };
  64
  65 static struct {
  66     struct fixed_settings fixed_out;
  67     struct fixed_settings fixed_in;
  68     union {
  69         int hz;
  70         int64_t ticks;
  71     } period;
  72     int plive;
  73     int log_to_monitor;
  74 } conf = {
  75     {                           /* DAC fixed settings */
  76         1,                      /* enabled */
  77         1,                      /* nb_voices */
  78         1,                      /* greedy */
  79         {
  80             44100,              /* freq */
  81             2,                  /* nchannels */
  82             AUD_FMT_S16         /* fmt */
  83         }
  84     },
  85
  86     {                           /* ADC fixed settings */
  87         1,                      /* enabled */
  88         1,                      /* nb_voices */
  89         1,                      /* greedy */
  90         {
  91             44100,              /* freq */
  92             2,                  /* nchannels */
  93             AUD_FMT_S16         /* fmt */
  94         }
  95     },
  96
  97     { 0 },                      /* period */
  98     0,                          /* plive */
  99     0                           /* log_to_monitor */
 100 };
 101
 102 static AudioState glob_audio_state;
 103
 104 volume_t nominal_volume = {
 105     0,
 106 #ifdef FLOAT_MIXENG
 107     1.0,
 108     1.0
 109 #else
 110     UINT_MAX,
 111     UINT_MAX
 112 #endif
 113 };
 114
 115 /* http://www.df.lth.se/~john_e/gems/gem002d.html */
 116 /* http://www.multi-platforms.com/Tips/PopCount.htm */
 117 uint32_t popcount (uint32_t u)
 118 {
 119     u = ((u&0x55555555) + ((u>>1)&0x55555555));
 120     u = ((u&0x33333333) + ((u>>2)&0x33333333));
 121     u = ((u&0x0f0f0f0f) + ((u>>4)&0x0f0f0f0f));
 122     u = ((u&0x00ff00ff) + ((u>>8)&0x00ff00ff));
 123     u = ( u&0x0000ffff) + (u>>16);
 124     return u;
 125 }
 126
 127 inline uint32_t lsbindex (uint32_t u)
 128 {
 129     return popcount ((u&-u)-1);
 130 }
 131
 132 #ifdef AUDIO_IS_FLAWLESS_AND_NO_CHECKS_ARE_REQURIED
 133 #error No its not
 134 #else
 135 int audio_bug (const char *funcname, int cond)
 136 {
 137     if (cond) {
 138         static int shown;
 139
 140         AUD_log (NULL, "Error a bug that was just triggered in %s\n", funcname);
 141         if (!shown) {
 142             shown = 1;
 143             AUD_log (NULL, "Save all your work and restart without audio\n");
 144             AUD_log (NULL, "Please send bug report to malc@pulsesoft.com\n");
 145             AUD_log (NULL, "I am sorry\n");
 146         }
 147         AUD_log (NULL, "Context:\n");
 148
 149 #if defined AUDIO_BREAKPOINT_ON_BUG
 150 #  if defined HOST_I386
 151 #    if defined __GNUC__
 152         __asm__ ("int3");
 153 #    elif defined _MSC_VER
 154         _asm _emit 0xcc;
 155 #    else
 156         abort ();
 157 #    endif
 158 #  else
 159         abort ();
 160 #  endif
 161 #endif
 162     }
 163
 164     return cond;
 165 }
 166 #endif
 167
 168 void *audio_calloc (const char *funcname, int nmemb, size_t size)
 169 {
 170     int cond;
 171     size_t len;
 172
 173     len = nmemb * size;
 174     cond = !nmemb || !size;
 175     cond |= nmemb < 0;
 176     cond |= len < size;
 177
 178     if (audio_bug ("audio_calloc", cond)) {
 179         AUD_log (NULL, "%s passed invalid arguments to audio_calloc\n",
 180                  funcname);
 181         AUD_log (NULL, "nmemb=%d size=%zu (len=%zu)\n", nmemb, size, len);
 182         return NULL;
 183     }
 184
 185     return qemu_mallocz (len);
 186 }
 187
 188 static char *audio_alloc_prefix (const char *s)
 189 {
 190     const char qemu_prefix[] = "QEMU_";
 191     size_t len;
 192     char *r;
 193
 194     if (!s) {
 195         return NULL;
 196     }
 197
 198     len = strlen (s);
 199     r = qemu_malloc (len + sizeof (qemu_prefix));
 200
 201     if (r) {
 202         size_t i;
 203         char *u = r + sizeof (qemu_prefix) - 1;
 204
 205         strcpy (r, qemu_prefix);
 206         strcat (r, s);
 207
 208         for (i = 0; i < len; ++i) {
 209             u[i] = toupper (u[i]);
 210         }
 211     }
 212     return r;
 213 }
 214
 215 const char *audio_audfmt_to_string (audfmt_e fmt)
 216 {
 217     switch (fmt) {
 218     case AUD_FMT_U8:
 219         return "U8";
 220
 221     case AUD_FMT_U16:
 222         return "U16";
 223
 224     case AUD_FMT_S8:
 225         return "S8";
 226
 227     case AUD_FMT_S16:
 228         return "S16";
 229     }
 230
 231     dolog ("Bogus audfmt %d returning S16\n", fmt);
 232     return "S16";
 233 }
 234
 235 audfmt_e audio_string_to_audfmt (const char *s, audfmt_e defval, int *defaultp)
 236 {
 237     if (!strcasecmp (s, "u8")) {
 238         *defaultp = 0;
 239         return AUD_FMT_U8;
 240     }
 241     else if (!strcasecmp (s, "u16")) {
 242         *defaultp = 0;
 243         return AUD_FMT_U16;
 244     }
 245     else if (!strcasecmp (s, "s8")) {
 246         *defaultp = 0;
 247         return AUD_FMT_S8;
 248     }
 249     else if (!strcasecmp (s, "s16")) {
 250         *defaultp = 0;
 251         return AUD_FMT_S16;
 252     }
 253     else {
 254         dolog ("Bogus audio format `%s' using %s\n",
 255                s, audio_audfmt_to_string (defval));
 256         *defaultp = 1;
 257         return defval;
 258     }
 259 }
 260
 261 static audfmt_e audio_get_conf_fmt (const char *envname,
 262                                     audfmt_e defval,
 263                                     int *defaultp)
 264 {
 265     const char *var = getenv (envname);
 266     if (!var) {
 267         *defaultp = 1;
 268         return defval;
 269     }
 270     return audio_string_to_audfmt (var, defval, defaultp);
 271 }
 272
 273 static int audio_get_conf_int (const char *key, int defval, int *defaultp)
 274 {
 275     int val;
 276     char *strval;
 277
 278     strval = getenv (key);
 279     if (strval) {
 280         *defaultp = 0;
 281         val = atoi (strval);
 282         return val;
 283     }
 284     else {
 285         *defaultp = 1;
 286         return defval;
 287     }
 288 }
 289
 290 static const char *audio_get_conf_str (const char *key,
 291                                        const char *defval,
 292                                        int *defaultp)
 293 {
 294     const char *val = getenv (key);
 295     if (!val) {
 296         *defaultp = 1;
 297         return defval;
 298     }
 299     else {
 300         *defaultp = 0;
 301         return val;
 302     }
 303 }
 304
 305 void AUD_vlog (const char *cap, const char *fmt, va_list ap)
 306 {
 307     if (conf.log_to_monitor) {
 308         if (cap) {
 309             term_printf ("%s: ", cap);
 310         }
 311
 312         term_vprintf (fmt, ap);
 313     }
 314     else {
 315         if (cap) {
 316             fprintf (stderr, "%s: ", cap);
 317         }
 318
 319         vfprintf (stderr, fmt, ap);
 320     }
 321 }
 322
 323 void AUD_log (const char *cap, const char *fmt, ...)
 324 {
 325     va_list ap;
 326
 327     va_start (ap, fmt);
 328     AUD_vlog (cap, fmt, ap);
 329     va_end (ap);
 330 }
 331
 332 static void audio_print_options (const char *prefix,
 333                                  struct audio_option *opt)
 334 {
 335     char *uprefix;
 336
 337     if (!prefix) {
 338         dolog ("No prefix specified\n");
 339         return;
 340     }
 341
 342     if (!opt) {
 343         dolog ("No options\n");
 344         return;
 345     }
 346
 347     uprefix = audio_alloc_prefix (prefix);
 348
 349     for (; opt->name; opt++) {
 350         const char *state = "default";
 351         printf ("  %s_%s: ", uprefix, opt->name);
 352
 353         if (opt->overridenp && *opt->overridenp) {
 354             state = "current";
 355         }
 356
 357         switch (opt->tag) {
 358         case AUD_OPT_BOOL:
 359             {
 360                 int *intp = opt->valp;
 361                 printf ("boolean, %s = %d\n", state, *intp ? 1 : 0);
 362             }
 363             break;
 364
 365         case AUD_OPT_INT:
 366             {
 367                 int *intp = opt->valp;
 368                 printf ("integer, %s = %d\n", state, *intp);
 369             }
 370             break;
 371
 372         case AUD_OPT_FMT:
 373             {
 374                 audfmt_e *fmtp = opt->valp;
 375                 printf (
 376                     "format, %s = %s, (one of: U8 S8 U16 S16)\n",
 377                     state,
 378                     audio_audfmt_to_string (*fmtp)
 379                     );
 380             }
 381             break;
 382
 383         case AUD_OPT_STR:
 384             {
 385                 const char **strp = opt->valp;
 386                 printf ("string, %s = %s\n",
 387                         state,
 388                         *strp ? *strp : "(not set)");
 389             }
 390             break;
 391
 392         default:
 393             printf ("???\n");
 394             dolog ("Bad value tag for option %s_%s %d\n",
 395                    uprefix, opt->name, opt->tag);
 396             break;
 397         }
 398         printf ("    %s\n", opt->descr);
 399     }
 400
 401     qemu_free (uprefix);
 402 }
 403
 404 static void audio_process_options (const char *prefix,
 405                                    struct audio_option *opt)
 406 {
 407     char *optname;
 408     const char qemu_prefix[] = "QEMU_";
 409     size_t preflen;
 410
 411     if (audio_bug (AUDIO_FUNC, !prefix)) {
 412         dolog ("prefix = NULL\n");
 413         return;
 414     }
 415
 416     if (audio_bug (AUDIO_FUNC, !opt)) {
 417         dolog ("opt = NULL\n");
 418         return;
 419     }
 420
 421     preflen = strlen (prefix);
 422
 423     for (; opt->name; opt++) {
 424         size_t len, i;
 425         int def;
 426
 427         if (!opt->valp) {
 428             dolog ("Option value pointer for `%s' is not set\n",
 429                    opt->name);
 430             continue;
 431         }
 432
 433         len = strlen (opt->name);
 434         /* len of opt->name + len of prefix + size of qemu_prefix
 435          * (includes trailing zero) + zero + underscore (on behalf of
 436          * sizeof) */
 437         optname = qemu_malloc (len + preflen + sizeof (qemu_prefix) + 1);
 438         if (!optname) {
 439             dolog ("Could not allocate memory for option name `%s'\n",
 440                    opt->name);
 441             continue;
 442         }
 443
 444         strcpy (optname, qemu_prefix);
 445
 446         /* copy while upper-casing, including trailing zero */
 447         for (i = 0; i <= preflen; ++i) {
 448             optname[i + sizeof (qemu_prefix) - 1] = toupper (prefix[i]);
 449         }
 450         strcat (optname, "_");
 451         strcat (optname, opt->name);
 452
 453         def = 1;
 454         switch (opt->tag) {
 455         case AUD_OPT_BOOL:
 456         case AUD_OPT_INT:
 457             {
 458                 int *intp = opt->valp;
 459                 *intp = audio_get_conf_int (optname, *intp, &def);
 460             }
 461             break;
 462
 463         case AUD_OPT_FMT:
 464             {
 465                 audfmt_e *fmtp = opt->valp;
 466                 *fmtp = audio_get_conf_fmt (optname, *fmtp, &def);
 467             }
 468             break;
 469
 470         case AUD_OPT_STR:
 471             {
 472                 const char **strp = opt->valp;
 473                 *strp = audio_get_conf_str (optname, *strp, &def);
 474             }
 475             break;
 476
 477         default:
 478             dolog ("Bad value tag for option `%s' - %d\n",
 479                    optname, opt->tag);
 480             break;
 481         }
 482
 483         if (!opt->overridenp) {
 484             opt->overridenp = &opt->overriden;
 485         }
 486         *opt->overridenp = !def;
 487         qemu_free (optname);
 488     }
 489 }
 490
 491 static void audio_print_settings (audsettings_t *as)
 492 {
 493     dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels);
 494
 495     switch (as->fmt) {
 496     case AUD_FMT_S8:
 497         AUD_log (NULL, "S8");
 498         break;
 499     case AUD_FMT_U8:
 500         AUD_log (NULL, "U8");
 501         break;
 502     case AUD_FMT_S16:
 503         AUD_log (NULL, "S16");
 504         break;
 505     case AUD_FMT_U16:
 506         AUD_log (NULL, "U16");
 507         break;
 508     default:
 509         AUD_log (NULL, "invalid(%d)", as->fmt);
 510         break;
 511     }
 512     AUD_log (NULL, "\n");
 513 }
 514
 515 static int audio_validate_settigs (audsettings_t *as)
 516 {
 517     int invalid;
 518
 519     invalid = as->nchannels != 1 && as->nchannels != 2;
 520
 521     switch (as->fmt) {
 522     case AUD_FMT_S8:
 523     case AUD_FMT_U8:
 524     case AUD_FMT_S16:
 525     case AUD_FMT_U16:
 526         break;
 527     default:
 528         invalid = 1;
 529         break;
 530     }
 531
 532     invalid |= as->freq <= 0;
 533
 534     if (invalid) {
 535         return -1;
 536     }
 537     return 0;
 538 }
 539
 540 static int audio_pcm_info_eq (struct audio_pcm_info *info, audsettings_t *as)
 541 {
 542     int bits = 8, sign = 0;
 543
 544     switch (as->fmt) {
 545     case AUD_FMT_S8:
 546         sign = 1;
 547     case AUD_FMT_U8:
 548         break;
 549
 550     case AUD_FMT_S16:
 551         sign = 1;
 552     case AUD_FMT_U16:
 553         bits = 16;
 554         break;
 555     }
 556     return info->freq == as->freq
 557         && info->nchannels == as->nchannels
 558         && info->sign == sign
 559         && info->bits == bits;
 560 }
 561
 562 void audio_pcm_init_info (
 563     struct audio_pcm_info *info,
 564     audsettings_t *as,
 565     int swap_endian
 566     )
 567 {
 568     int bits = 8, sign = 0;
 569
 570     switch (as->fmt) {
 571     case AUD_FMT_S8:
 572         sign = 1;
 573     case AUD_FMT_U8:
 574         break;
 575
 576     case AUD_FMT_S16:
 577         sign = 1;
 578     case AUD_FMT_U16:
 579         bits = 16;
 580         break;
 581     }
 582
 583     info->freq = as->freq;
 584     info->bits = bits;
 585     info->sign = sign;
 586     info->nchannels = as->nchannels;
 587     info->shift = (as->nchannels == 2) + (bits == 16);
 588     info->align = (1 << info->shift) - 1;
 589     info->bytes_per_second = info->freq << info->shift;
 590     info->swap_endian = swap_endian;
 591 }
 592
 593 void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len)
 594 {
 595     if (!len) {
 596         return;
 597     }
 598
 599     if (info->sign) {
 600         memset (buf, len << info->shift, 0x00);
 601     }
 602     else {
 603         if (info->bits == 8) {
 604             memset (buf, len << info->shift, 0x80);
 605         }
 606         else {
 607             int i;
 608             uint16_t *p = buf;
 609             int shift = info->nchannels - 1;
 610             short s = INT16_MAX;
 611
 612             if (info->swap_endian) {
 613                 s = bswap16 (s);
 614             }
 615
 616             for (i = 0; i < len << shift; i++) {
 617                 p[i] = s;
 618             }
 619         }
 620     }
 621 }
 622
 623 /*
 624  * Hard voice (capture)
 625  */
 626 static int audio_pcm_hw_find_min_in (HWVoiceIn *hw)
 627 {
 628     SWVoiceIn *sw;
 629     int m = hw->total_samples_captured;
 630
 631     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 632         if (sw->active) {
 633             m = audio_MIN (m, sw->total_hw_samples_acquired);
 634         }
 635     }
 636     return m;
 637 }
 638
 639 int audio_pcm_hw_get_live_in (HWVoiceIn *hw)
 640 {
 641     int live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw);
 642     if (audio_bug (AUDIO_FUNC, live < 0 || live > hw->samples)) {
 643         dolog ("live=%d hw->samples=%d\n", live, hw->samples);
 644         return 0;
 645     }
 646     return live;
 647 }
 648
 649 /*
 650  * Soft voice (capture)
 651  */
 652 static int audio_pcm_sw_get_rpos_in (SWVoiceIn *sw)
 653 {
 654     HWVoiceIn *hw = sw->hw;
 655     int live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 656     int rpos;
 657
 658     if (audio_bug (AUDIO_FUNC, live < 0 || live > hw->samples)) {
 659         dolog ("live=%d hw->samples=%d\n", live, hw->samples);
 660         return 0;
 661     }
 662
 663     rpos = hw->wpos - live;
 664     if (rpos >= 0) {
 665         return rpos;
 666     }
 667     else {
 668         return hw->samples + rpos;
 669     }
 670 }
 671
 672 int audio_pcm_sw_read (SWVoiceIn *sw, void *buf, int size)
 673 {
 674     HWVoiceIn *hw = sw->hw;
 675     int samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0;
 676     st_sample_t *src, *dst = sw->buf;
 677
 678     rpos = audio_pcm_sw_get_rpos_in (sw) % hw->samples;
 679
 680     live = hw->total_samples_captured - sw->total_hw_samples_acquired;
 681     if (audio_bug (AUDIO_FUNC, live < 0 || live > hw->samples)) {
 682         dolog ("live_in=%d hw->samples=%d\n", live, hw->samples);
 683         return 0;
 684     }
 685
 686     samples = size >> sw->info.shift;
 687     if (!live) {
 688         return 0;
 689     }
 690
 691     swlim = (live * sw->ratio) >> 32;
 692     swlim = audio_MIN (swlim, samples);
 693
 694     while (swlim) {
 695         src = hw->conv_buf + rpos;
 696         isamp = hw->wpos - rpos;
 697         /* XXX: <= ? */
 698         if (isamp <= 0) {
 699             isamp = hw->samples - rpos;
 700         }
 701
 702         if (!isamp) {
 703             break;
 704         }
 705         osamp = swlim;
 706
 707         if (audio_bug (AUDIO_FUNC, osamp < 0)) {
 708             dolog ("osamp=%d\n", osamp);
 709             return 0;
 710         }
 711
 712         st_rate_flow (sw->rate, src, dst, &isamp, &osamp);
 713         swlim -= osamp;
 714         rpos = (rpos + isamp) % hw->samples;
 715         dst += osamp;
 716         ret += osamp;
 717         total += isamp;
 718     }
 719
 720     sw->clip (buf, sw->buf, ret);
 721     sw->total_hw_samples_acquired += total;
 722     return ret << sw->info.shift;
 723 }
 724
 725 /*
 726  * Hard voice (playback)
 727  */
 728 static int audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep)
 729 {
 730     SWVoiceOut *sw;
 731     int m = INT_MAX;
 732     int nb_live = 0;
 733
 734     for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
 735         if (sw->active || !sw->empty) {
 736             m = audio_MIN (m, sw->total_hw_samples_mixed);
 737             nb_live += 1;
 738         }
 739     }
 740
 741     *nb_livep = nb_live;
 742     return m;
 743 }
 744
 745 int audio_pcm_hw_get_live_out2 (HWVoiceOut *hw, int *nb_live)
 746 {
 747     int smin;
 748
 749     smin = audio_pcm_hw_find_min_out (hw, nb_live);
 750
 751     if (!*nb_live) {
 752         return 0;
 753     }
 754     else {
 755         int live = smin;
 756
 757         if (audio_bug (AUDIO_FUNC, live < 0 || live > hw->samples)) {
 758             dolog ("live=%d hw->samples=%d\n", live, hw->samples);
 759             return 0;
 760         }
 761         return live;
 762     }
 763 }
 764
 765 int audio_pcm_hw_get_live_out (HWVoiceOut *hw)
 766 {
 767     int nb_live;
 768     int live;
 769
 770     live = audio_pcm_hw_get_live_out2 (hw, &nb_live);
 771     if (audio_bug (AUDIO_FUNC, live < 0 || live > hw->samples)) {
 772         dolog ("live=%d hw->samples=%d\n", live, hw->samples);
 773         return 0;
 774     }
 775     return live;
 776 }
 777
 778 /*
 779  * Soft voice (playback)
 780  */
 781 int audio_pcm_sw_write (SWVoiceOut *sw, void *buf, int size)
 782 {
 783     int hwsamples, samples, isamp, osamp, wpos, live, dead, left, swlim, blck;
 784     int ret = 0, pos = 0, total = 0;
 785
 786     if (!sw) {
 787         return size;
 788     }
 789
 790     hwsamples = sw->hw->samples;
 791
 792     live = sw->total_hw_samples_mixed;
 793     if (audio_bug (AUDIO_FUNC, live < 0 || live > hwsamples)){
 794         dolog ("live=%d hw->samples=%d\n", live, hwsamples);
 795         return 0;
 796     }
 797
 798     if (live == hwsamples) {
 799         return 0;
 800     }
 801
 802     wpos = (sw->hw->rpos + live) % hwsamples;
 803     samples = size >> sw->info.shift;
 804
 805     dead = hwsamples - live;
 806     swlim = ((int64_t) dead << 32) / sw->ratio;
 807     swlim = audio_MIN (swlim, samples);
 808     if (swlim) {
 809         sw->conv (sw->buf, buf, swlim, &sw->vol);
 810     }
 811
 812     while (swlim) {
 813         dead = hwsamples - live;
 814         left = hwsamples - wpos;
 815         blck = audio_MIN (dead, left);
 816         if (!blck) {
 817             break;
 818         }
 819         isamp = swlim;
 820         osamp = blck;
 821         st_rate_flow_mix (
 822             sw->rate,
 823             sw->buf + pos,
 824             sw->hw->mix_buf + wpos,
 825             &isamp,
 826             &osamp
 827             );
 828         ret += isamp;
 829         swlim -= isamp;
 830         pos += isamp;
 831         live += osamp;
 832         wpos = (wpos + osamp) % hwsamples;
 833         total += osamp;
 834     }
 835
 836     sw->total_hw_samples_mixed += total;
 837     sw->empty = sw->total_hw_samples_mixed == 0;
 838
 839 #ifdef DEBUG_OUT
 840     dolog (
 841         "%s: write size %d ret %d total sw %d\n",
 842         SW_NAME (sw),
 843         size >> sw->info.shift,
 844         ret,
 845         sw->total_hw_samples_mixed
 846         );
 847 #endif
 848
 849     return ret << sw->info.shift;
 850 }
 851
 852 #ifdef DEBUG_AUDIO
 853 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
 854 {
 855     dolog ("%s: bits %d, sign %d, freq %d, nchan %d\n",
 856            cap, info->bits, info->sign, info->freq, info->nchannels);
 857 }
 858 #endif
 859
 860 #define DAC
 861 #include "audio_template.h"
 862 #undef DAC
 863 #include "audio_template.h"
 864
 865 int AUD_write (SWVoiceOut *sw, void *buf, int size)
 866 {
 867     int bytes;
 868
 869     if (!sw) {
 870         /* XXX: Consider options */
 871         return size;
 872     }
 873
 874     if (!sw->hw->enabled) {
 875         dolog ("Writing to disabled voice %s\n", SW_NAME (sw));
 876         return 0;
 877     }
 878
 879     bytes = sw->hw->pcm_ops->write (sw, buf, size);
 880     return bytes;
 881 }
 882
 883 int AUD_read (SWVoiceIn *sw, void *buf, int size)
 884 {
 885     int bytes;
 886
 887     if (!sw) {
 888         /* XXX: Consider options */
 889         return size;
 890     }
 891
 892     if (!sw->hw->enabled) {
 893         dolog ("Reading from disabled voice %s\n", SW_NAME (sw));
 894         return 0;
 895     }
 896
 897     bytes = sw->hw->pcm_ops->read (sw, buf, size);
 898     return bytes;
 899 }
 900
 901 int AUD_get_buffer_size_out (SWVoiceOut *sw)
 902 {
 903     return sw->hw->samples << sw->hw->info.shift;
 904 }
 905
 906 void AUD_set_active_out (SWVoiceOut *sw, int on)
 907 {
 908     HWVoiceOut *hw;
 909
 910     if (!sw) {
 911         return;
 912     }
 913
 914     hw = sw->hw;
 915     if (sw->active != on) {
 916         SWVoiceOut *temp_sw;
 917
 918         if (on) {
 919             int total;
 920
 921             hw->pending_disable = 0;
 922             if (!hw->enabled) {
 923                 hw->enabled = 1;
 924                 hw->pcm_ops->ctl_out (hw, VOICE_ENABLE);
 925             }
 926
 927             if (sw->empty) {
 928                 total = 0;
 929             }
 930         }
 931         else {
 932             if (hw->enabled) {
 933                 int nb_active = 0;
 934
 935                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 936                      temp_sw = temp_sw->entries.le_next) {
 937                     nb_active += temp_sw->active != 0;
 938                 }
 939
 940                 hw->pending_disable = nb_active == 1;
 941             }
 942         }
 943         sw->active = on;
 944     }
 945 }
 946
 947 void AUD_set_active_in (SWVoiceIn *sw, int on)
 948 {
 949     HWVoiceIn *hw;
 950
 951     if (!sw) {
 952         return;
 953     }
 954
 955     hw = sw->hw;
 956     if (sw->active != on) {
 957         SWVoiceIn *temp_sw;
 958
 959         if (on) {
 960             if (!hw->enabled) {
 961                 hw->enabled = 1;
 962                 hw->pcm_ops->ctl_in (hw, VOICE_ENABLE);
 963             }
 964             sw->total_hw_samples_acquired = hw->total_samples_captured;
 965         }
 966         else {
 967             if (hw->enabled) {
 968                 int nb_active = 0;
 969
 970                 for (temp_sw = hw->sw_head.lh_first; temp_sw;
 971                      temp_sw = temp_sw->entries.le_next) {
 972                     nb_active += temp_sw->active != 0;
 973                 }
 974
 975                 if (nb_active == 1) {
 976                     hw->enabled = 0;
 977                     hw->pcm_ops->ctl_in (hw, VOICE_DISABLE);
 978                 }
 979             }
 980         }
 981         sw->active = on;
 982     }
 983 }
 984
 985 static int audio_get_avail (SWVoiceIn *sw)
 986 {
 987     int live;
 988
 989     if (!sw) {
 990         return 0;
 991     }
 992
 993     live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
 994     if (audio_bug (AUDIO_FUNC, live < 0 || live > sw->hw->samples)) {
 995         dolog ("live=%d sw->hw->samples=%d\n", live, sw->hw->samples);
 996         return 0;
 997     }
 998
 999     ldebug (
1000         "%s: get_avail live %d ret %lld\n",
1001         SW_NAME (sw),
1002         live, (((int64_t) live << 32) / sw->ratio) << sw->info.shift
1003         );
1004
1005     return (((int64_t) live << 32) / sw->ratio) << sw->info.shift;
1006 }
1007
1008 static int audio_get_free (SWVoiceOut *sw)
1009 {
1010     int live, dead;
1011
1012     if (!sw) {
1013         return 0;
1014     }
1015
1016     live = sw->total_hw_samples_mixed;
1017
1018     if (audio_bug (AUDIO_FUNC, live < 0 || live > sw->hw->samples)) {
1019         dolog ("live=%d sw->hw->samples=%d\n", live, sw->hw->samples);
1020         return 0;
1021     }
1022
1023     dead = sw->hw->samples - live;
1024
1025 #ifdef DEBUG_OUT
1026     dolog ("%s: get_free live %d dead %d ret %lld\n",
1027            SW_NAME (sw),
1028            live, dead, (((int64_t) dead << 32) / sw->ratio) << sw->info.shift);
1029 #endif
1030
1031     return (((int64_t) dead << 32) / sw->ratio) << sw->info.shift;
1032 }
1033
1034 static void audio_run_out (AudioState *s)
1035 {
1036     HWVoiceOut *hw = NULL;
1037     SWVoiceOut *sw;
1038
1039     while ((hw = audio_pcm_hw_find_any_enabled_out (s, hw))) {
1040         int played;
1041         int live, free, nb_live, cleanup_required;
1042
1043         live = audio_pcm_hw_get_live_out2 (hw, &nb_live);
1044         if (!nb_live) {
1045             live = 0;
1046         }
1047
1048         if (audio_bug (AUDIO_FUNC, live < 0 || live > hw->samples)) {
1049             dolog ("live=%d hw->samples=%d\n", live, hw->samples);
1050             continue;
1051         }
1052
1053         if (hw->pending_disable && !nb_live) {
1054 #ifdef DEBUG_OUT
1055             dolog ("Disabling voice\n");
1056 #endif
1057             hw->enabled = 0;
1058             hw->pending_disable = 0;
1059             hw->pcm_ops->ctl_out (hw, VOICE_DISABLE);
1060             continue;
1061         }
1062
1063         if (!live) {
1064             for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1065                 if (sw->active) {
1066                     free = audio_get_free (sw);
1067                     if (free > 0) {
1068                         sw->callback.fn (sw->callback.opaque, free);
1069                     }
1070                 }
1071             }
1072             continue;
1073         }
1074
1075         played = hw->pcm_ops->run_out (hw);
1076         if (audio_bug (AUDIO_FUNC, hw->rpos >= hw->samples)) {
1077             dolog ("hw->rpos=%d hw->samples=%d played=%d\n",
1078                    hw->rpos, hw->samples, played);
1079             hw->rpos = 0;
1080         }
1081
1082 #ifdef DEBUG_OUT
1083         dolog ("played=%d\n", played);
1084 #endif
1085
1086         if (played) {
1087             hw->ts_helper += played;
1088         }
1089
1090         cleanup_required = 0;
1091         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1092             if (!sw->active && sw->empty) {
1093                 continue;
1094             }
1095
1096             if (audio_bug (AUDIO_FUNC, played > sw->total_hw_samples_mixed)) {
1097                 dolog ("played=%d sw->total_hw_samples_mixed=%d\n",
1098                        played, sw->total_hw_samples_mixed);
1099                 played = sw->total_hw_samples_mixed;
1100             }
1101
1102             sw->total_hw_samples_mixed -= played;
1103
1104             if (!sw->total_hw_samples_mixed) {
1105                 sw->empty = 1;
1106                 cleanup_required |= !sw->active && !sw->callback.fn;
1107             }
1108
1109             if (sw->active) {
1110                 free = audio_get_free (sw);
1111                 if (free > 0) {
1112                     sw->callback.fn (sw->callback.opaque, free);
1113                 }
1114             }
1115         }
1116
1117         if (cleanup_required) {
1118         restart:
1119             for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1120                 if (!sw->active && !sw->callback.fn) {
1121 #ifdef DEBUG_PLIVE
1122                     dolog ("Finishing with old voice\n");
1123 #endif
1124                     audio_close_out (s, sw);
1125                     goto restart; /* play it safe */
1126                 }
1127             }
1128         }
1129     }
1130 }
1131
1132 static void audio_run_in (AudioState *s)
1133 {
1134     HWVoiceIn *hw = NULL;
1135
1136     while ((hw = audio_pcm_hw_find_any_enabled_in (s, hw))) {
1137         SWVoiceIn *sw;
1138         int captured, min;
1139
1140         captured = hw->pcm_ops->run_in (hw);
1141
1142         min = audio_pcm_hw_find_min_in (hw);
1143         hw->total_samples_captured += captured - min;
1144         hw->ts_helper += captured;
1145
1146         for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) {
1147             sw->total_hw_samples_acquired -= min;
1148
1149             if (sw->active) {
1150                 int avail;
1151
1152                 avail = audio_get_avail (sw);
1153                 if (avail > 0) {
1154                     sw->callback.fn (sw->callback.opaque, avail);
1155                 }
1156             }
1157         }
1158     }
1159 }
1160
1161 static void audio_timer (void *opaque)
1162 {
1163     AudioState *s = opaque;
1164
1165     audio_run_out (s);
1166     audio_run_in (s);
1167
1168     qemu_mod_timer (s->ts, qemu_get_clock (vm_clock) + conf.period.ticks);
1169 }
1170
1171 static struct audio_option audio_options[] = {
1172     /* DAC */
1173     {"DAC_FIXED_SETTINGS", AUD_OPT_BOOL, &conf.fixed_out.enabled,
1174      "Use fixed settings for host DAC", NULL, 0},
1175
1176     {"DAC_FIXED_FREQ", AUD_OPT_INT, &conf.fixed_out.settings.freq,
1177      "Frequency for fixed host DAC", NULL, 0},
1178
1179     {"DAC_FIXED_FMT", AUD_OPT_FMT, &conf.fixed_out.settings.fmt,
1180      "Format for fixed host DAC", NULL, 0},
1181
1182     {"DAC_FIXED_CHANNELS", AUD_OPT_INT, &conf.fixed_out.settings.nchannels,
1183      "Number of channels for fixed DAC (1 - mono, 2 - stereo)", NULL, 0},
1184
1185     {"DAC_VOICES", AUD_OPT_INT, &conf.fixed_out.nb_voices,
1186      "Number of voices for DAC", NULL, 0},
1187
1188     /* ADC */
1189     {"ADC_FIXED_SETTINGS", AUD_OPT_BOOL, &conf.fixed_in.enabled,
1190      "Use fixed settings for host ADC", NULL, 0},
1191
1192     {"ADC_FIXED_FREQ", AUD_OPT_INT, &conf.fixed_in.settings.freq,
1193      "Frequency for fixed host ADC", NULL, 0},
1194
1195     {"ADC_FIXED_FMT", AUD_OPT_FMT, &conf.fixed_in.settings.fmt,
1196      "Format for fixed host ADC", NULL, 0},
1197
1198     {"ADC_FIXED_CHANNELS", AUD_OPT_INT, &conf.fixed_in.settings.nchannels,
1199      "Number of channels for fixed ADC (1 - mono, 2 - stereo)", NULL, 0},
1200
1201     {"ADC_VOICES", AUD_OPT_INT, &conf.fixed_in.nb_voices,
1202      "Number of voices for ADC", NULL, 0},
1203
1204     /* Misc */
1205     {"TIMER_PERIOD", AUD_OPT_INT, &conf.period.hz,
1206      "Timer period in HZ (0 - use lowest possible)", NULL, 0},
1207
1208     {"PLIVE", AUD_OPT_BOOL, &conf.plive,
1209      "(undocumented)", NULL, 0},
1210
1211     {"LOG_TO_MONITOR", AUD_OPT_BOOL, &conf.log_to_monitor,
1212      "print logging messages to montior instead of stderr", NULL, 0},
1213
1214     {NULL, 0, NULL, NULL, NULL, 0}
1215 };
1216
1217 static void audio_pp_nb_voices (const char *typ, int nb)
1218 {
1219     switch (nb) {
1220     case 0:
1221         printf ("Does not support %s\n", typ);
1222         break;
1223     case 1:
1224         printf ("One %s voice\n", typ);
1225         break;
1226     case INT_MAX:
1227         printf ("Theoretically supports many %s voices\n", typ);
1228         break;
1229     default:
1230         printf ("Theoretically supports upto %d %s voices\n", nb, typ);
1231         break;
1232     }
1233
1234 }
1235
1236 void AUD_help (void)
1237 {
1238     size_t i;
1239
1240     audio_process_options ("AUDIO", audio_options);
1241     for (i = 0; i < sizeof (drvtab) / sizeof (drvtab[0]); i++) {
1242         struct audio_driver *d = drvtab[i];
1243         if (d->options) {
1244             audio_process_options (d->name, d->options);
1245         }
1246     }
1247
1248     printf ("Audio options:\n");
1249     audio_print_options ("AUDIO", audio_options);
1250     printf ("\n");
1251
1252     printf ("Available drivers:\n");
1253
1254     for (i = 0; i < sizeof (drvtab) / sizeof (drvtab[0]); i++) {
1255         struct audio_driver *d = drvtab[i];
1256
1257         printf ("Name: %s\n", d->name);
1258         printf ("Description: %s\n", d->descr);
1259
1260         audio_pp_nb_voices ("playback", d->max_voices_out);
1261         audio_pp_nb_voices ("capture", d->max_voices_in);
1262
1263         if (d->options) {
1264             printf ("Options:\n");
1265             audio_print_options (d->name, d->options);
1266         }
1267         else {
1268             printf ("No options\n");
1269         }
1270         printf ("\n");
1271     }
1272
1273     printf (
1274         "Options are settable through environment variables.\n"
1275         "Example:\n"
1276 #ifdef _WIN32
1277         "  set QEMU_AUDIO_DRV=wav\n"
1278         "  set QEMU_WAV_PATH=c:\\tune.wav\n"
1279 #else
1280         "  export QEMU_AUDIO_DRV=wav\n"
1281         "  export QEMU_WAV_PATH=$HOME/tune.wav\n"
1282         "(for csh replace export with setenv in the above)\n"
1283 #endif
1284         "  qemu ...\n\n"
1285         );
1286 }
1287
1288 static int audio_driver_init (AudioState *s, struct audio_driver *drv)
1289 {
1290     if (drv->options) {
1291         audio_process_options (drv->name, drv->options);
1292     }
1293     s->drv_opaque = drv->init ();
1294
1295     if (s->drv_opaque) {
1296         audio_init_nb_voices_out (s, drv);
1297         audio_init_nb_voices_in (s, drv);
1298         s->drv = drv;
1299         return 0;
1300     }
1301     else {
1302         dolog ("Could not init `%s' audio driver\n", drv->name);
1303         return -1;
1304     }
1305 }
1306
1307 static void audio_vm_change_state_handler (void *opaque, int running)
1308 {
1309     AudioState *s = opaque;
1310     HWVoiceOut *hwo = NULL;
1311     HWVoiceIn *hwi = NULL;
1312     int op = running ? VOICE_ENABLE : VOICE_DISABLE;
1313
1314     while ((hwo = audio_pcm_hw_find_any_enabled_out (s, hwo))) {
1315         hwo->pcm_ops->ctl_out (hwo, op);
1316     }
1317
1318     while ((hwi = audio_pcm_hw_find_any_enabled_in (s, hwi))) {
1319         hwi->pcm_ops->ctl_in (hwi, op);
1320     }
1321 }
1322
1323 static void audio_atexit (void)
1324 {
1325     AudioState *s = &glob_audio_state;
1326     HWVoiceOut *hwo = NULL;
1327     HWVoiceIn *hwi = NULL;
1328
1329     while ((hwo = audio_pcm_hw_find_any_enabled_out (s, hwo))) {
1330         hwo->pcm_ops->ctl_out (hwo, VOICE_DISABLE);
1331         hwo->pcm_ops->fini_out (hwo);
1332     }
1333
1334     while ((hwi = audio_pcm_hw_find_any_enabled_in (s, hwi))) {
1335         hwi->pcm_ops->ctl_in (hwi, VOICE_DISABLE);
1336         hwi->pcm_ops->fini_in (hwi);
1337     }
1338
1339     if (s->drv) {
1340         s->drv->fini (s->drv_opaque);
1341     }
1342 }
1343
1344 static void audio_save (QEMUFile *f, void *opaque)
1345 {
1346     (void) f;
1347     (void) opaque;
1348 }
1349
1350 static int audio_load (QEMUFile *f, void *opaque, int version_id)
1351 {
1352     (void) f;
1353     (void) opaque;
1354
1355     if (version_id != 1) {
1356         return -EINVAL;
1357     }
1358
1359     return 0;
1360 }
1361
1362 void AUD_register_card (AudioState *s, const char *name, QEMUSoundCard *card)
1363 {
1364     card->audio = s;
1365     card->name = qemu_strdup (name);
1366     memset (&card->entries, 0, sizeof (card->entries));
1367     LIST_INSERT_HEAD (&s->card_head, card, entries);
1368 }
1369
1370 void AUD_remove_card (QEMUSoundCard *card)
1371 {
1372     LIST_REMOVE (card, entries);
1373     card->audio = NULL;
1374     qemu_free (card->name);
1375 }
1376
1377 AudioState *AUD_init (void)
1378 {
1379     size_t i;
1380     int done = 0;
1381     const char *drvname;
1382     AudioState *s = &glob_audio_state;
1383
1384     LIST_INIT (&s->hw_head_out);
1385     LIST_INIT (&s->hw_head_in);
1386     atexit (audio_atexit);
1387
1388     s->ts = qemu_new_timer (vm_clock, audio_timer, s);
1389     if (!s->ts) {
1390         dolog ("Could not create audio timer\n");
1391         return NULL;
1392     }
1393
1394     audio_process_options ("AUDIO", audio_options);
1395
1396     s->nb_hw_voices_out = conf.fixed_out.nb_voices;
1397     s->nb_hw_voices_in = conf.fixed_in.nb_voices;
1398
1399     if (s->nb_hw_voices_out <= 0) {
1400         dolog ("Bogus number of playback voices %d, setting to 1\n",
1401                s->nb_hw_voices_out);
1402         s->nb_hw_voices_out = 1;
1403     }
1404
1405     if (s->nb_hw_voices_in <= 0) {
1406         dolog ("Bogus number of capture voices %d, setting to 0\n",
1407                s->nb_hw_voices_in);
1408         s->nb_hw_voices_in = 0;
1409     }
1410
1411     {
1412         int def;
1413         drvname = audio_get_conf_str ("QEMU_AUDIO_DRV", NULL, &def);
1414     }
1415
1416     if (drvname) {
1417         int found = 0;
1418
1419         for (i = 0; i < sizeof (drvtab) / sizeof (drvtab[0]); i++) {
1420             if (!strcmp (drvname, drvtab[i]->name)) {
1421                 done = !audio_driver_init (s, drvtab[i]);
1422                 found = 1;
1423                 break;
1424             }
1425         }
1426
1427         if (!found) {
1428             dolog ("Unknown audio driver `%s'\n", drvname);
1429             dolog ("Run with -audio-help to list available drivers\n");
1430         }
1431     }
1432
1433     if (!done) {
1434         for (i = 0; !done && i < sizeof (drvtab) / sizeof (drvtab[0]); i++) {
1435             if (drvtab[i]->can_be_default) {
1436                 done = !audio_driver_init (s, drvtab[i]);
1437             }
1438         }
1439     }
1440
1441     if (!done) {
1442         done = !audio_driver_init (s, &no_audio_driver);
1443         if (!done) {
1444             dolog ("Could not initialize audio subsystem\n");
1445         }
1446         else {
1447             dolog ("warning: Using timer based audio emulation\n");
1448         }
1449     }
1450
1451     if (done) {
1452         VMChangeStateEntry *e;
1453
1454         if (conf.period.hz <= 0) {
1455             if (conf.period.hz < 0) {
1456                 dolog ("warning: Timer period is negative - %d "
1457                        "treating as zero\n",
1458                        conf.period.hz);
1459             }
1460             conf.period.ticks = 1;
1461         }
1462         else {
1463             conf.period.ticks = ticks_per_sec / conf.period.hz;
1464         }
1465
1466         e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
1467         if (!e) {
1468             dolog ("warning: Could not register change state handler\n"
1469                    "(Audio can continue looping even after stopping the VM)\n");
1470         }
1471     }
1472     else {
1473         qemu_del_timer (s->ts);
1474         return NULL;
1475     }
1476
1477     LIST_INIT (&s->card_head);
1478     register_savevm ("audio", 0, 1, audio_save, audio_load, s);
1479     qemu_mod_timer (s->ts, qemu_get_clock (vm_clock) + conf.period.ticks);
1480     return s;
1481 }