audio/dsoundaudio.c

   1 /*
   2  * QEMU DirectSound audio driver
   3  *
   4  * Copyright (c) 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 /*
  26  * SEAL 1.07 by Carlos 'pel' Hasan was used as documentation
  27  */
  28
  29 #include "qemu-common.h"
  30 #include "audio.h"
  31
  32 #define AUDIO_CAP "dsound"
  33 #include "audio_int.h"
  34
  35 #include <windows.h>
  36 #include <mmsystem.h>
  37 #include <objbase.h>
  38 #include <dsound.h>
  39
  40 #include "audio_win_int.h"
  41
  42 /* #define DEBUG_DSOUND */
  43
  44 typedef struct {
  45     int bufsize_in;
  46     int bufsize_out;
  47     int latency_millis;
  48 } DSoundConf;
  49
  50 typedef struct {
  51     LPDIRECTSOUND dsound;
  52     LPDIRECTSOUNDCAPTURE dsound_capture;
  53     struct audsettings settings;
  54     DSoundConf conf;
  55 } dsound;
  56
  57 typedef struct {
  58     HWVoiceOut hw;
  59     LPDIRECTSOUNDBUFFER dsound_buffer;
  60     DWORD old_pos;
  61     int first_time;
  62     dsound *s;
  63 #ifdef DEBUG_DSOUND
  64     DWORD old_ppos;
  65     DWORD played;
  66     DWORD mixed;
  67 #endif
  68 } DSoundVoiceOut;
  69
  70 typedef struct {
  71     HWVoiceIn hw;
  72     int first_time;
  73     LPDIRECTSOUNDCAPTUREBUFFER dsound_capture_buffer;
  74     dsound *s;
  75 } DSoundVoiceIn;
  76
  77 static void dsound_log_hresult (HRESULT hr)
  78 {
  79     const char *str = "BUG";
  80
  81     switch (hr) {
  82     case DS_OK:
  83         str = "The method succeeded";
  84         break;
  85 #ifdef DS_NO_VIRTUALIZATION
  86     case DS_NO_VIRTUALIZATION:
  87         str = "The buffer was created, but another 3D algorithm was substituted";
  88         break;
  89 #endif
  90 #ifdef DS_INCOMPLETE
  91     case DS_INCOMPLETE:
  92         str = "The method succeeded, but not all the optional effects were obtained";
  93         break;
  94 #endif
  95 #ifdef DSERR_ACCESSDENIED
  96     case DSERR_ACCESSDENIED:
  97         str = "The request failed because access was denied";
  98         break;
  99 #endif
 100 #ifdef DSERR_ALLOCATED
 101     case DSERR_ALLOCATED:
 102         str = "The request failed because resources, such as a priority level, were already in use by another caller";
 103         break;
 104 #endif
 105 #ifdef DSERR_ALREADYINITIALIZED
 106     case DSERR_ALREADYINITIALIZED:
 107         str = "The object is already initialized";
 108         break;
 109 #endif
 110 #ifdef DSERR_BADFORMAT
 111     case DSERR_BADFORMAT:
 112         str = "The specified wave format is not supported";
 113         break;
 114 #endif
 115 #ifdef DSERR_BADSENDBUFFERGUID
 116     case DSERR_BADSENDBUFFERGUID:
 117         str = "The GUID specified in an audiopath file does not match a valid mix-in buffer";
 118         break;
 119 #endif
 120 #ifdef DSERR_BUFFERLOST
 121     case DSERR_BUFFERLOST:
 122         str = "The buffer memory has been lost and must be restored";
 123         break;
 124 #endif
 125 #ifdef DSERR_BUFFERTOOSMALL
 126     case DSERR_BUFFERTOOSMALL:
 127         str = "The buffer size is not great enough to enable effects processing";
 128         break;
 129 #endif
 130 #ifdef DSERR_CONTROLUNAVAIL
 131     case DSERR_CONTROLUNAVAIL:
 132         str = "The buffer control (volume, pan, and so on) requested by the caller is not available. Controls must be specified when the buffer is created, using the dwFlags member of DSBUFFERDESC";
 133         break;
 134 #endif
 135 #ifdef DSERR_DS8_REQUIRED
 136     case DSERR_DS8_REQUIRED:
 137         str = "A DirectSound object of class CLSID_DirectSound8 or later is required for the requested functionality. For more information, see IDirectSound8 Interface";
 138         break;
 139 #endif
 140 #ifdef DSERR_FXUNAVAILABLE
 141     case DSERR_FXUNAVAILABLE:
 142         str = "The effects requested could not be found on the system, or they are in the wrong order or in the wrong location; for example, an effect expected in hardware was found in software";
 143         break;
 144 #endif
 145 #ifdef DSERR_GENERIC
 146     case DSERR_GENERIC :
 147         str = "An undetermined error occurred inside the DirectSound subsystem";
 148         break;
 149 #endif
 150 #ifdef DSERR_INVALIDCALL
 151     case DSERR_INVALIDCALL:
 152         str = "This function is not valid for the current state of this object";
 153         break;
 154 #endif
 155 #ifdef DSERR_INVALIDPARAM
 156     case DSERR_INVALIDPARAM:
 157         str = "An invalid parameter was passed to the returning function";
 158         break;
 159 #endif
 160 #ifdef DSERR_NOAGGREGATION
 161     case DSERR_NOAGGREGATION:
 162         str = "The object does not support aggregation";
 163         break;
 164 #endif
 165 #ifdef DSERR_NODRIVER
 166     case DSERR_NODRIVER:
 167         str = "No sound driver is available for use, or the given GUID is not a valid DirectSound device ID";
 168         break;
 169 #endif
 170 #ifdef DSERR_NOINTERFACE
 171     case DSERR_NOINTERFACE:
 172         str = "The requested COM interface is not available";
 173         break;
 174 #endif
 175 #ifdef DSERR_OBJECTNOTFOUND
 176     case DSERR_OBJECTNOTFOUND:
 177         str = "The requested object was not found";
 178         break;
 179 #endif
 180 #ifdef DSERR_OTHERAPPHASPRIO
 181     case DSERR_OTHERAPPHASPRIO:
 182         str = "Another application has a higher priority level, preventing this call from succeeding";
 183         break;
 184 #endif
 185 #ifdef DSERR_OUTOFMEMORY
 186     case DSERR_OUTOFMEMORY:
 187         str = "The DirectSound subsystem could not allocate sufficient memory to complete the caller's request";
 188         break;
 189 #endif
 190 #ifdef DSERR_PRIOLEVELNEEDED
 191     case DSERR_PRIOLEVELNEEDED:
 192         str = "A cooperative level of DSSCL_PRIORITY or higher is required";
 193         break;
 194 #endif
 195 #ifdef DSERR_SENDLOOP
 196     case DSERR_SENDLOOP:
 197         str = "A circular loop of send effects was detected";
 198         break;
 199 #endif
 200 #ifdef DSERR_UNINITIALIZED
 201     case DSERR_UNINITIALIZED:
 202         str = "The Initialize method has not been called or has not been called successfully before other methods were called";
 203         break;
 204 #endif
 205 #ifdef DSERR_UNSUPPORTED
 206     case DSERR_UNSUPPORTED:
 207         str = "The function called is not supported at this time";
 208         break;
 209 #endif
 210     default:
 211         AUD_log (AUDIO_CAP, "Reason: Unknown (HRESULT %#lx)\n", hr);
 212         return;
 213     }
 214
 215     AUD_log (AUDIO_CAP, "Reason: %s\n", str);
 216 }
 217
 218 static void GCC_FMT_ATTR (2, 3) dsound_logerr (
 219     HRESULT hr,
 220     const char *fmt,
 221     ...
 222     )
 223 {
 224     va_list ap;
 225
 226     va_start (ap, fmt);
 227     AUD_vlog (AUDIO_CAP, fmt, ap);
 228     va_end (ap);
 229
 230     dsound_log_hresult (hr);
 231 }
 232
 233 static void GCC_FMT_ATTR (3, 4) dsound_logerr2 (
 234     HRESULT hr,
 235     const char *typ,
 236     const char *fmt,
 237     ...
 238     )
 239 {
 240     va_list ap;
 241
 242     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 243     va_start (ap, fmt);
 244     AUD_vlog (AUDIO_CAP, fmt, ap);
 245     va_end (ap);
 246
 247     dsound_log_hresult (hr);
 248 }
 249
 250 static DWORD millis_to_bytes (struct audio_pcm_info *info, DWORD millis)
 251 {
 252     return (millis * info->bytes_per_second) / 1000;
 253 }
 254
 255 #ifdef DEBUG_DSOUND
 256 static void print_wave_format (WAVEFORMATEX *wfx)
 257 {
 258     dolog ("tag             = %d\n", wfx->wFormatTag);
 259     dolog ("nChannels       = %d\n", wfx->nChannels);
 260     dolog ("nSamplesPerSec  = %ld\n", wfx->nSamplesPerSec);
 261     dolog ("nAvgBytesPerSec = %ld\n", wfx->nAvgBytesPerSec);
 262     dolog ("nBlockAlign     = %d\n", wfx->nBlockAlign);
 263     dolog ("wBitsPerSample  = %d\n", wfx->wBitsPerSample);
 264     dolog ("cbSize          = %d\n", wfx->cbSize);
 265 }
 266 #endif
 267
 268 static int dsound_restore_out (LPDIRECTSOUNDBUFFER dsb, dsound *s)
 269 {
 270     HRESULT hr;
 271
 272     hr = IDirectSoundBuffer_Restore (dsb);
 273
 274     if (hr != DS_OK) {
 275         dsound_logerr (hr, "Could not restore playback buffer\n");
 276         return -1;
 277     }
 278     return 0;
 279 }
 280
 281 #include "dsound_template.h"
 282 #define DSBTYPE_IN
 283 #include "dsound_template.h"
 284 #undef DSBTYPE_IN
 285
 286 static int dsound_get_status_out (LPDIRECTSOUNDBUFFER dsb, DWORD *statusp,
 287                                   dsound *s)
 288 {
 289     HRESULT hr;
 290
 291     hr = IDirectSoundBuffer_GetStatus (dsb, statusp);
 292     if (FAILED (hr)) {
 293         dsound_logerr (hr, "Could not get playback buffer status\n");
 294         return -1;
 295     }
 296
 297     if (*statusp & DSERR_BUFFERLOST) {
 298         dsound_restore_out(dsb, s);
 299         return -1;
 300     }
 301
 302     return 0;
 303 }
 304
 305 static int dsound_get_status_in (LPDIRECTSOUNDCAPTUREBUFFER dscb,
 306                                  DWORD *statusp)
 307 {
 308     HRESULT hr;
 309
 310     hr = IDirectSoundCaptureBuffer_GetStatus (dscb, statusp);
 311     if (FAILED (hr)) {
 312         dsound_logerr (hr, "Could not get capture buffer status\n");
 313         return -1;
 314     }
 315
 316     return 0;
 317 }
 318
 319 static void dsound_write_sample (HWVoiceOut *hw, uint8_t *dst, int dst_len)
 320 {
 321     int src_len1 = dst_len;
 322     int src_len2 = 0;
 323     int pos = hw->rpos + dst_len;
 324     struct st_sample *src1 = hw->mix_buf + hw->rpos;
 325     struct st_sample *src2 = NULL;
 326
 327     if (pos > hw->samples) {
 328         src_len1 = hw->samples - hw->rpos;
 329         src2 = hw->mix_buf;
 330         src_len2 = dst_len - src_len1;
 331         pos = src_len2;
 332     }
 333
 334     if (src_len1) {
 335         hw->clip (dst, src1, src_len1);
 336     }
 337
 338     if (src_len2) {
 339         dst = advance (dst, src_len1 << hw->info.shift);
 340         hw->clip (dst, src2, src_len2);
 341     }
 342
 343     hw->rpos = pos % hw->samples;
 344 }
 345
 346 static void dsound_clear_sample (HWVoiceOut *hw, LPDIRECTSOUNDBUFFER dsb,
 347                                  dsound *s)
 348 {
 349     int err;
 350     LPVOID p1, p2;
 351     DWORD blen1, blen2, len1, len2;
 352
 353     err = dsound_lock_out (
 354         dsb,
 355         &hw->info,
 356         0,
 357         hw->samples << hw->info.shift,
 358         &p1, &p2,
 359         &blen1, &blen2,
 360         1,
 361         s
 362         );
 363     if (err) {
 364         return;
 365     }
 366
 367     len1 = blen1 >> hw->info.shift;
 368     len2 = blen2 >> hw->info.shift;
 369
 370 #ifdef DEBUG_DSOUND
 371     dolog ("clear %p,%ld,%ld %p,%ld,%ld\n",
 372            p1, blen1, len1,
 373            p2, blen2, len2);
 374 #endif
 375
 376     if (p1 && len1) {
 377         audio_pcm_info_clear_buf (&hw->info, p1, len1);
 378     }
 379
 380     if (p2 && len2) {
 381         audio_pcm_info_clear_buf (&hw->info, p2, len2);
 382     }
 383
 384     dsound_unlock_out (dsb, p1, p2, blen1, blen2);
 385 }
 386
 387 static int dsound_open (dsound *s)
 388 {
 389     HRESULT hr;
 390     HWND hwnd;
 391
 392     hwnd = GetForegroundWindow ();
 393     hr = IDirectSound_SetCooperativeLevel (
 394         s->dsound,
 395         hwnd,
 396         DSSCL_PRIORITY
 397         );
 398
 399     if (FAILED (hr)) {
 400         dsound_logerr (hr, "Could not set cooperative level for window %p\n",
 401                        hwnd);
 402         return -1;
 403     }
 404
 405     return 0;
 406 }
 407
 408 static int dsound_ctl_out (HWVoiceOut *hw, int cmd, ...)
 409 {
 410     HRESULT hr;
 411     DWORD status;
 412     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 413     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 414     dsound *s = ds->s;
 415
 416     if (!dsb) {
 417         dolog ("Attempt to control voice without a buffer\n");
 418         return 0;
 419     }
 420
 421     switch (cmd) {
 422     case VOICE_ENABLE:
 423         if (dsound_get_status_out (dsb, &status, s)) {
 424             return -1;
 425         }
 426
 427         if (status & DSBSTATUS_PLAYING) {
 428             dolog ("warning: Voice is already playing\n");
 429             return 0;
 430         }
 431
 432         dsound_clear_sample (hw, dsb, s);
 433
 434         hr = IDirectSoundBuffer_Play (dsb, 0, 0, DSBPLAY_LOOPING);
 435         if (FAILED (hr)) {
 436             dsound_logerr (hr, "Could not start playing buffer\n");
 437             return -1;
 438         }
 439         break;
 440
 441     case VOICE_DISABLE:
 442         if (dsound_get_status_out (dsb, &status, s)) {
 443             return -1;
 444         }
 445
 446         if (status & DSBSTATUS_PLAYING) {
 447             hr = IDirectSoundBuffer_Stop (dsb);
 448             if (FAILED (hr)) {
 449                 dsound_logerr (hr, "Could not stop playing buffer\n");
 450                 return -1;
 451             }
 452         }
 453         else {
 454             dolog ("warning: Voice is not playing\n");
 455         }
 456         break;
 457     }
 458     return 0;
 459 }
 460
 461 static int dsound_write (SWVoiceOut *sw, void *buf, int len)
 462 {
 463     return audio_pcm_sw_write (sw, buf, len);
 464 }
 465
 466 static int dsound_run_out (HWVoiceOut *hw, int live)
 467 {
 468     int err;
 469     HRESULT hr;
 470     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 471     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 472     int len, hwshift;
 473     DWORD blen1, blen2;
 474     DWORD len1, len2;
 475     DWORD decr;
 476     DWORD wpos, ppos, old_pos;
 477     LPVOID p1, p2;
 478     int bufsize;
 479     dsound *s = ds->s;
 480     DSoundConf *conf = &s->conf;
 481
 482     if (!dsb) {
 483         dolog ("Attempt to run empty with playback buffer\n");
 484         return 0;
 485     }
 486
 487     hwshift = hw->info.shift;
 488     bufsize = hw->samples << hwshift;
 489
 490     hr = IDirectSoundBuffer_GetCurrentPosition (
 491         dsb,
 492         &ppos,
 493         ds->first_time ? &wpos : NULL
 494         );
 495     if (FAILED (hr)) {
 496         dsound_logerr (hr, "Could not get playback buffer position\n");
 497         return 0;
 498     }
 499
 500     len = live << hwshift;
 501
 502     if (ds->first_time) {
 503         if (conf->latency_millis) {
 504             DWORD cur_blat;
 505
 506             cur_blat = audio_ring_dist (wpos, ppos, bufsize);
 507             ds->first_time = 0;
 508             old_pos = wpos;
 509             old_pos +=
 510                 millis_to_bytes (&hw->info, conf->latency_millis) - cur_blat;
 511             old_pos %= bufsize;
 512             old_pos &= ~hw->info.align;
 513         }
 514         else {
 515             old_pos = wpos;
 516         }
 517 #ifdef DEBUG_DSOUND
 518         ds->played = 0;
 519         ds->mixed = 0;
 520 #endif
 521     }
 522     else {
 523         if (ds->old_pos == ppos) {
 524 #ifdef DEBUG_DSOUND
 525             dolog ("old_pos == ppos\n");
 526 #endif
 527             return 0;
 528         }
 529
 530 #ifdef DEBUG_DSOUND
 531         ds->played += audio_ring_dist (ds->old_pos, ppos, hw->bufsize);
 532 #endif
 533         old_pos = ds->old_pos;
 534     }
 535
 536     if ((old_pos < ppos) && ((old_pos + len) > ppos)) {
 537         len = ppos - old_pos;
 538     }
 539     else {
 540         if ((old_pos > ppos) && ((old_pos + len) > (ppos + bufsize))) {
 541             len = bufsize - old_pos + ppos;
 542         }
 543     }
 544
 545     if (audio_bug (AUDIO_FUNC, len < 0 || len > bufsize)) {
 546         dolog ("len=%d bufsize=%d old_pos=%ld ppos=%ld\n",
 547                len, bufsize, old_pos, ppos);
 548         return 0;
 549     }
 550
 551     len &= ~hw->info.align;
 552     if (!len) {
 553         return 0;
 554     }
 555
 556 #ifdef DEBUG_DSOUND
 557     ds->old_ppos = ppos;
 558 #endif
 559     err = dsound_lock_out (
 560         dsb,
 561         &hw->info,
 562         old_pos,
 563         len,
 564         &p1, &p2,
 565         &blen1, &blen2,
 566         0,
 567         s
 568         );
 569     if (err) {
 570         return 0;
 571     }
 572
 573     len1 = blen1 >> hwshift;
 574     len2 = blen2 >> hwshift;
 575     decr = len1 + len2;
 576
 577     if (p1 && len1) {
 578         dsound_write_sample (hw, p1, len1);
 579     }
 580
 581     if (p2 && len2) {
 582         dsound_write_sample (hw, p2, len2);
 583     }
 584
 585     dsound_unlock_out (dsb, p1, p2, blen1, blen2);
 586     ds->old_pos = (old_pos + (decr << hwshift)) % bufsize;
 587
 588 #ifdef DEBUG_DSOUND
 589     ds->mixed += decr << hwshift;
 590
 591     dolog ("played %lu mixed %lu diff %ld sec %f\n",
 592            ds->played,
 593            ds->mixed,
 594            ds->mixed - ds->played,
 595            abs (ds->mixed - ds->played) / (double) hw->info.bytes_per_second);
 596 #endif
 597     return decr;
 598 }
 599
 600 static int dsound_ctl_in (HWVoiceIn *hw, int cmd, ...)
 601 {
 602     HRESULT hr;
 603     DWORD status;
 604     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 605     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 606
 607     if (!dscb) {
 608         dolog ("Attempt to control capture voice without a buffer\n");
 609         return -1;
 610     }
 611
 612     switch (cmd) {
 613     case VOICE_ENABLE:
 614         if (dsound_get_status_in (dscb, &status)) {
 615             return -1;
 616         }
 617
 618         if (status & DSCBSTATUS_CAPTURING) {
 619             dolog ("warning: Voice is already capturing\n");
 620             return 0;
 621         }
 622
 623         /* clear ?? */
 624
 625         hr = IDirectSoundCaptureBuffer_Start (dscb, DSCBSTART_LOOPING);
 626         if (FAILED (hr)) {
 627             dsound_logerr (hr, "Could not start capturing\n");
 628             return -1;
 629         }
 630         break;
 631
 632     case VOICE_DISABLE:
 633         if (dsound_get_status_in (dscb, &status)) {
 634             return -1;
 635         }
 636
 637         if (status & DSCBSTATUS_CAPTURING) {
 638             hr = IDirectSoundCaptureBuffer_Stop (dscb);
 639             if (FAILED (hr)) {
 640                 dsound_logerr (hr, "Could not stop capturing\n");
 641                 return -1;
 642             }
 643         }
 644         else {
 645             dolog ("warning: Voice is not capturing\n");
 646         }
 647         break;
 648     }
 649     return 0;
 650 }
 651
 652 static int dsound_read (SWVoiceIn *sw, void *buf, int len)
 653 {
 654     return audio_pcm_sw_read (sw, buf, len);
 655 }
 656
 657 static int dsound_run_in (HWVoiceIn *hw)
 658 {
 659     int err;
 660     HRESULT hr;
 661     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 662     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 663     int live, len, dead;
 664     DWORD blen1, blen2;
 665     DWORD len1, len2;
 666     DWORD decr;
 667     DWORD cpos, rpos;
 668     LPVOID p1, p2;
 669     int hwshift;
 670     dsound *s = ds->s;
 671
 672     if (!dscb) {
 673         dolog ("Attempt to run without capture buffer\n");
 674         return 0;
 675     }
 676
 677     hwshift = hw->info.shift;
 678
 679     live = audio_pcm_hw_get_live_in (hw);
 680     dead = hw->samples - live;
 681     if (!dead) {
 682         return 0;
 683     }
 684
 685     hr = IDirectSoundCaptureBuffer_GetCurrentPosition (
 686         dscb,
 687         &cpos,
 688         ds->first_time ? &rpos : NULL
 689         );
 690     if (FAILED (hr)) {
 691         dsound_logerr (hr, "Could not get capture buffer position\n");
 692         return 0;
 693     }
 694
 695     if (ds->first_time) {
 696         ds->first_time = 0;
 697         if (rpos & hw->info.align) {
 698             ldebug ("warning: Misaligned capture read position %ld(%d)\n",
 699                     rpos, hw->info.align);
 700         }
 701         hw->wpos = rpos >> hwshift;
 702     }
 703
 704     if (cpos & hw->info.align) {
 705         ldebug ("warning: Misaligned capture position %ld(%d)\n",
 706                 cpos, hw->info.align);
 707     }
 708     cpos >>= hwshift;
 709
 710     len = audio_ring_dist (cpos, hw->wpos, hw->samples);
 711     if (!len) {
 712         return 0;
 713     }
 714     len = audio_MIN (len, dead);
 715
 716     err = dsound_lock_in (
 717         dscb,
 718         &hw->info,
 719         hw->wpos << hwshift,
 720         len << hwshift,
 721         &p1,
 722         &p2,
 723         &blen1,
 724         &blen2,
 725         0,
 726         s
 727         );
 728     if (err) {
 729         return 0;
 730     }
 731
 732     len1 = blen1 >> hwshift;
 733     len2 = blen2 >> hwshift;
 734     decr = len1 + len2;
 735
 736     if (p1 && len1) {
 737         hw->conv (hw->conv_buf + hw->wpos, p1, len1);
 738     }
 739
 740     if (p2 && len2) {
 741         hw->conv (hw->conv_buf, p2, len2);
 742     }
 743
 744     dsound_unlock_in (dscb, p1, p2, blen1, blen2);
 745     hw->wpos = (hw->wpos + decr) % hw->samples;
 746     return decr;
 747 }
 748
 749 static DSoundConf glob_conf = {
 750     .bufsize_in         = 16384,
 751     .bufsize_out        = 16384,
 752     .latency_millis     = 10
 753 };
 754
 755 static void dsound_audio_fini (void *opaque)
 756 {
 757     HRESULT hr;
 758     dsound *s = opaque;
 759
 760     if (!s->dsound) {
 761         g_free(s);
 762         return;
 763     }
 764
 765     hr = IDirectSound_Release (s->dsound);
 766     if (FAILED (hr)) {
 767         dsound_logerr (hr, "Could not release DirectSound\n");
 768     }
 769     s->dsound = NULL;
 770
 771     if (!s->dsound_capture) {
 772         g_free(s);
 773         return;
 774     }
 775
 776     hr = IDirectSoundCapture_Release (s->dsound_capture);
 777     if (FAILED (hr)) {
 778         dsound_logerr (hr, "Could not release DirectSoundCapture\n");
 779     }
 780     s->dsound_capture = NULL;
 781
 782     g_free(s);
 783 }
 784
 785 static void *dsound_audio_init (void)
 786 {
 787     int err;
 788     HRESULT hr;
 789     dsound *s = g_malloc0(sizeof(dsound));
 790
 791     s->conf = glob_conf;
 792     hr = CoInitialize (NULL);
 793     if (FAILED (hr)) {
 794         dsound_logerr (hr, "Could not initialize COM\n");
 795         g_free(s);
 796         return NULL;
 797     }
 798
 799     hr = CoCreateInstance (
 800         &CLSID_DirectSound,
 801         NULL,
 802         CLSCTX_ALL,
 803         &IID_IDirectSound,
 804         (void **) &s->dsound
 805         );
 806     if (FAILED (hr)) {
 807         dsound_logerr (hr, "Could not create DirectSound instance\n");
 808         g_free(s);
 809         return NULL;
 810     }
 811
 812     hr = IDirectSound_Initialize (s->dsound, NULL);
 813     if (FAILED (hr)) {
 814         dsound_logerr (hr, "Could not initialize DirectSound\n");
 815
 816         hr = IDirectSound_Release (s->dsound);
 817         if (FAILED (hr)) {
 818             dsound_logerr (hr, "Could not release DirectSound\n");
 819         }
 820         g_free(s);
 821         return NULL;
 822     }
 823
 824     hr = CoCreateInstance (
 825         &CLSID_DirectSoundCapture,
 826         NULL,
 827         CLSCTX_ALL,
 828         &IID_IDirectSoundCapture,
 829         (void **) &s->dsound_capture
 830         );
 831     if (FAILED (hr)) {
 832         dsound_logerr (hr, "Could not create DirectSoundCapture instance\n");
 833     }
 834     else {
 835         hr = IDirectSoundCapture_Initialize (s->dsound_capture, NULL);
 836         if (FAILED (hr)) {
 837             dsound_logerr (hr, "Could not initialize DirectSoundCapture\n");
 838
 839             hr = IDirectSoundCapture_Release (s->dsound_capture);
 840             if (FAILED (hr)) {
 841                 dsound_logerr (hr, "Could not release DirectSoundCapture\n");
 842             }
 843             s->dsound_capture = NULL;
 844         }
 845     }
 846
 847     err = dsound_open (s);
 848     if (err) {
 849         dsound_audio_fini (s);
 850         return NULL;
 851     }
 852
 853     return s;
 854 }
 855
 856 static struct audio_option dsound_options[] = {
 857     {
 858         .name  = "LATENCY_MILLIS",
 859         .tag   = AUD_OPT_INT,
 860         .valp  = &glob_conf.latency_millis,
 861         .descr = "(undocumented)"
 862     },
 863     {
 864         .name  = "BUFSIZE_OUT",
 865         .tag   = AUD_OPT_INT,
 866         .valp  = &glob_conf.bufsize_out,
 867         .descr = "(undocumented)"
 868     },
 869     {
 870         .name  = "BUFSIZE_IN",
 871         .tag   = AUD_OPT_INT,
 872         .valp  = &glob_conf.bufsize_in,
 873         .descr = "(undocumented)"
 874     },
 875     { /* End of list */ }
 876 };
 877
 878 static struct audio_pcm_ops dsound_pcm_ops = {
 879     .init_out = dsound_init_out,
 880     .fini_out = dsound_fini_out,
 881     .run_out  = dsound_run_out,
 882     .write    = dsound_write,
 883     .ctl_out  = dsound_ctl_out,
 884
 885     .init_in  = dsound_init_in,
 886     .fini_in  = dsound_fini_in,
 887     .run_in   = dsound_run_in,
 888     .read     = dsound_read,
 889     .ctl_in   = dsound_ctl_in
 890 };
 891
 892 struct audio_driver dsound_audio_driver = {
 893     .name           = "dsound",
 894     .descr          = "DirectSound http://wikipedia.org/wiki/DirectSound",
 895     .options        = dsound_options,
 896     .init           = dsound_audio_init,
 897     .fini           = dsound_audio_fini,
 898     .pcm_ops        = &dsound_pcm_ops,
 899     .can_be_default = 1,
 900     .max_voices_out = INT_MAX,
 901     .max_voices_in  = 1,
 902     .voice_size_out = sizeof (DSoundVoiceOut),
 903     .voice_size_in  = sizeof (DSoundVoiceIn)
 904 };