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/osdep.h"
  30 #include "qemu-common.h"
  31 #include "audio.h"
  32
  33 #define AUDIO_CAP "dsound"
  34 #include "audio_int.h"
  35
  36 #include <windows.h>
  37 #include <mmsystem.h>
  38 #include <objbase.h>
  39 #include <dsound.h>
  40
  41 #include "audio_win_int.h"
  42
  43 /* #define DEBUG_DSOUND */
  44
  45 typedef struct {
  46     int bufsize_in;
  47     int bufsize_out;
  48     int latency_millis;
  49 } DSoundConf;
  50
  51 typedef struct {
  52     LPDIRECTSOUND dsound;
  53     LPDIRECTSOUNDCAPTURE dsound_capture;
  54     struct audsettings settings;
  55     DSoundConf conf;
  56 } dsound;
  57
  58 typedef struct {
  59     HWVoiceOut hw;
  60     LPDIRECTSOUNDBUFFER dsound_buffer;
  61     DWORD old_pos;
  62     int first_time;
  63     dsound *s;
  64 #ifdef DEBUG_DSOUND
  65     DWORD old_ppos;
  66     DWORD played;
  67     DWORD mixed;
  68 #endif
  69 } DSoundVoiceOut;
  70
  71 typedef struct {
  72     HWVoiceIn hw;
  73     int first_time;
  74     LPDIRECTSOUNDCAPTUREBUFFER dsound_capture_buffer;
  75     dsound *s;
  76 } DSoundVoiceIn;
  77
  78 static void dsound_log_hresult (HRESULT hr)
  79 {
  80     const char *str = "BUG";
  81
  82     switch (hr) {
  83     case DS_OK:
  84         str = "The method succeeded";
  85         break;
  86 #ifdef DS_NO_VIRTUALIZATION
  87     case DS_NO_VIRTUALIZATION:
  88         str = "The buffer was created, but another 3D algorithm was substituted";
  89         break;
  90 #endif
  91 #ifdef DS_INCOMPLETE
  92     case DS_INCOMPLETE:
  93         str = "The method succeeded, but not all the optional effects were obtained";
  94         break;
  95 #endif
  96 #ifdef DSERR_ACCESSDENIED
  97     case DSERR_ACCESSDENIED:
  98         str = "The request failed because access was denied";
  99         break;
 100 #endif
 101 #ifdef DSERR_ALLOCATED
 102     case DSERR_ALLOCATED:
 103         str = "The request failed because resources, such as a priority level, were already in use by another caller";
 104         break;
 105 #endif
 106 #ifdef DSERR_ALREADYINITIALIZED
 107     case DSERR_ALREADYINITIALIZED:
 108         str = "The object is already initialized";
 109         break;
 110 #endif
 111 #ifdef DSERR_BADFORMAT
 112     case DSERR_BADFORMAT:
 113         str = "The specified wave format is not supported";
 114         break;
 115 #endif
 116 #ifdef DSERR_BADSENDBUFFERGUID
 117     case DSERR_BADSENDBUFFERGUID:
 118         str = "The GUID specified in an audiopath file does not match a valid mix-in buffer";
 119         break;
 120 #endif
 121 #ifdef DSERR_BUFFERLOST
 122     case DSERR_BUFFERLOST:
 123         str = "The buffer memory has been lost and must be restored";
 124         break;
 125 #endif
 126 #ifdef DSERR_BUFFERTOOSMALL
 127     case DSERR_BUFFERTOOSMALL:
 128         str = "The buffer size is not great enough to enable effects processing";
 129         break;
 130 #endif
 131 #ifdef DSERR_CONTROLUNAVAIL
 132     case DSERR_CONTROLUNAVAIL:
 133         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";
 134         break;
 135 #endif
 136 #ifdef DSERR_DS8_REQUIRED
 137     case DSERR_DS8_REQUIRED:
 138         str = "A DirectSound object of class CLSID_DirectSound8 or later is required for the requested functionality. For more information, see IDirectSound8 Interface";
 139         break;
 140 #endif
 141 #ifdef DSERR_FXUNAVAILABLE
 142     case DSERR_FXUNAVAILABLE:
 143         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";
 144         break;
 145 #endif
 146 #ifdef DSERR_GENERIC
 147     case DSERR_GENERIC :
 148         str = "An undetermined error occurred inside the DirectSound subsystem";
 149         break;
 150 #endif
 151 #ifdef DSERR_INVALIDCALL
 152     case DSERR_INVALIDCALL:
 153         str = "This function is not valid for the current state of this object";
 154         break;
 155 #endif
 156 #ifdef DSERR_INVALIDPARAM
 157     case DSERR_INVALIDPARAM:
 158         str = "An invalid parameter was passed to the returning function";
 159         break;
 160 #endif
 161 #ifdef DSERR_NOAGGREGATION
 162     case DSERR_NOAGGREGATION:
 163         str = "The object does not support aggregation";
 164         break;
 165 #endif
 166 #ifdef DSERR_NODRIVER
 167     case DSERR_NODRIVER:
 168         str = "No sound driver is available for use, or the given GUID is not a valid DirectSound device ID";
 169         break;
 170 #endif
 171 #ifdef DSERR_NOINTERFACE
 172     case DSERR_NOINTERFACE:
 173         str = "The requested COM interface is not available";
 174         break;
 175 #endif
 176 #ifdef DSERR_OBJECTNOTFOUND
 177     case DSERR_OBJECTNOTFOUND:
 178         str = "The requested object was not found";
 179         break;
 180 #endif
 181 #ifdef DSERR_OTHERAPPHASPRIO
 182     case DSERR_OTHERAPPHASPRIO:
 183         str = "Another application has a higher priority level, preventing this call from succeeding";
 184         break;
 185 #endif
 186 #ifdef DSERR_OUTOFMEMORY
 187     case DSERR_OUTOFMEMORY:
 188         str = "The DirectSound subsystem could not allocate sufficient memory to complete the caller's request";
 189         break;
 190 #endif
 191 #ifdef DSERR_PRIOLEVELNEEDED
 192     case DSERR_PRIOLEVELNEEDED:
 193         str = "A cooperative level of DSSCL_PRIORITY or higher is required";
 194         break;
 195 #endif
 196 #ifdef DSERR_SENDLOOP
 197     case DSERR_SENDLOOP:
 198         str = "A circular loop of send effects was detected";
 199         break;
 200 #endif
 201 #ifdef DSERR_UNINITIALIZED
 202     case DSERR_UNINITIALIZED:
 203         str = "The Initialize method has not been called or has not been called successfully before other methods were called";
 204         break;
 205 #endif
 206 #ifdef DSERR_UNSUPPORTED
 207     case DSERR_UNSUPPORTED:
 208         str = "The function called is not supported at this time";
 209         break;
 210 #endif
 211     default:
 212         AUD_log (AUDIO_CAP, "Reason: Unknown (HRESULT %#lx)\n", hr);
 213         return;
 214     }
 215
 216     AUD_log (AUDIO_CAP, "Reason: %s\n", str);
 217 }
 218
 219 static void GCC_FMT_ATTR (2, 3) dsound_logerr (
 220     HRESULT hr,
 221     const char *fmt,
 222     ...
 223     )
 224 {
 225     va_list ap;
 226
 227     va_start (ap, fmt);
 228     AUD_vlog (AUDIO_CAP, fmt, ap);
 229     va_end (ap);
 230
 231     dsound_log_hresult (hr);
 232 }
 233
 234 static void GCC_FMT_ATTR (3, 4) dsound_logerr2 (
 235     HRESULT hr,
 236     const char *typ,
 237     const char *fmt,
 238     ...
 239     )
 240 {
 241     va_list ap;
 242
 243     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 244     va_start (ap, fmt);
 245     AUD_vlog (AUDIO_CAP, fmt, ap);
 246     va_end (ap);
 247
 248     dsound_log_hresult (hr);
 249 }
 250
 251 static DWORD millis_to_bytes (struct audio_pcm_info *info, DWORD millis)
 252 {
 253     return (millis * info->bytes_per_second) / 1000;
 254 }
 255
 256 #ifdef DEBUG_DSOUND
 257 static void print_wave_format (WAVEFORMATEX *wfx)
 258 {
 259     dolog ("tag             = %d\n", wfx->wFormatTag);
 260     dolog ("nChannels       = %d\n", wfx->nChannels);
 261     dolog ("nSamplesPerSec  = %ld\n", wfx->nSamplesPerSec);
 262     dolog ("nAvgBytesPerSec = %ld\n", wfx->nAvgBytesPerSec);
 263     dolog ("nBlockAlign     = %d\n", wfx->nBlockAlign);
 264     dolog ("wBitsPerSample  = %d\n", wfx->wBitsPerSample);
 265     dolog ("cbSize          = %d\n", wfx->cbSize);
 266 }
 267 #endif
 268
 269 static int dsound_restore_out (LPDIRECTSOUNDBUFFER dsb, dsound *s)
 270 {
 271     HRESULT hr;
 272
 273     hr = IDirectSoundBuffer_Restore (dsb);
 274
 275     if (hr != DS_OK) {
 276         dsound_logerr (hr, "Could not restore playback buffer\n");
 277         return -1;
 278     }
 279     return 0;
 280 }
 281
 282 #include "dsound_template.h"
 283 #define DSBTYPE_IN
 284 #include "dsound_template.h"
 285 #undef DSBTYPE_IN
 286
 287 static int dsound_get_status_out (LPDIRECTSOUNDBUFFER dsb, DWORD *statusp,
 288                                   dsound *s)
 289 {
 290     HRESULT hr;
 291
 292     hr = IDirectSoundBuffer_GetStatus (dsb, statusp);
 293     if (FAILED (hr)) {
 294         dsound_logerr (hr, "Could not get playback buffer status\n");
 295         return -1;
 296     }
 297
 298     if (*statusp & DSERR_BUFFERLOST) {
 299         dsound_restore_out(dsb, s);
 300         return -1;
 301     }
 302
 303     return 0;
 304 }
 305
 306 static int dsound_get_status_in (LPDIRECTSOUNDCAPTUREBUFFER dscb,
 307                                  DWORD *statusp)
 308 {
 309     HRESULT hr;
 310
 311     hr = IDirectSoundCaptureBuffer_GetStatus (dscb, statusp);
 312     if (FAILED (hr)) {
 313         dsound_logerr (hr, "Could not get capture buffer status\n");
 314         return -1;
 315     }
 316
 317     return 0;
 318 }
 319
 320 static void dsound_write_sample (HWVoiceOut *hw, uint8_t *dst, int dst_len)
 321 {
 322     int src_len1 = dst_len;
 323     int src_len2 = 0;
 324     int pos = hw->rpos + dst_len;
 325     struct st_sample *src1 = hw->mix_buf + hw->rpos;
 326     struct st_sample *src2 = NULL;
 327
 328     if (pos > hw->samples) {
 329         src_len1 = hw->samples - hw->rpos;
 330         src2 = hw->mix_buf;
 331         src_len2 = dst_len - src_len1;
 332         pos = src_len2;
 333     }
 334
 335     if (src_len1) {
 336         hw->clip (dst, src1, src_len1);
 337     }
 338
 339     if (src_len2) {
 340         dst = advance (dst, src_len1 << hw->info.shift);
 341         hw->clip (dst, src2, src_len2);
 342     }
 343
 344     hw->rpos = pos % hw->samples;
 345 }
 346
 347 static void dsound_clear_sample (HWVoiceOut *hw, LPDIRECTSOUNDBUFFER dsb,
 348                                  dsound *s)
 349 {
 350     int err;
 351     LPVOID p1, p2;
 352     DWORD blen1, blen2, len1, len2;
 353
 354     err = dsound_lock_out (
 355         dsb,
 356         &hw->info,
 357         0,
 358         hw->samples << hw->info.shift,
 359         &p1, &p2,
 360         &blen1, &blen2,
 361         1,
 362         s
 363         );
 364     if (err) {
 365         return;
 366     }
 367
 368     len1 = blen1 >> hw->info.shift;
 369     len2 = blen2 >> hw->info.shift;
 370
 371 #ifdef DEBUG_DSOUND
 372     dolog ("clear %p,%ld,%ld %p,%ld,%ld\n",
 373            p1, blen1, len1,
 374            p2, blen2, len2);
 375 #endif
 376
 377     if (p1 && len1) {
 378         audio_pcm_info_clear_buf (&hw->info, p1, len1);
 379     }
 380
 381     if (p2 && len2) {
 382         audio_pcm_info_clear_buf (&hw->info, p2, len2);
 383     }
 384
 385     dsound_unlock_out (dsb, p1, p2, blen1, blen2);
 386 }
 387
 388 static int dsound_open (dsound *s)
 389 {
 390     HRESULT hr;
 391     HWND hwnd;
 392
 393     hwnd = GetForegroundWindow ();
 394     hr = IDirectSound_SetCooperativeLevel (
 395         s->dsound,
 396         hwnd,
 397         DSSCL_PRIORITY
 398         );
 399
 400     if (FAILED (hr)) {
 401         dsound_logerr (hr, "Could not set cooperative level for window %p\n",
 402                        hwnd);
 403         return -1;
 404     }
 405
 406     return 0;
 407 }
 408
 409 static int dsound_ctl_out (HWVoiceOut *hw, int cmd, ...)
 410 {
 411     HRESULT hr;
 412     DWORD status;
 413     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 414     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 415     dsound *s = ds->s;
 416
 417     if (!dsb) {
 418         dolog ("Attempt to control voice without a buffer\n");
 419         return 0;
 420     }
 421
 422     switch (cmd) {
 423     case VOICE_ENABLE:
 424         if (dsound_get_status_out (dsb, &status, s)) {
 425             return -1;
 426         }
 427
 428         if (status & DSBSTATUS_PLAYING) {
 429             dolog ("warning: Voice is already playing\n");
 430             return 0;
 431         }
 432
 433         dsound_clear_sample (hw, dsb, s);
 434
 435         hr = IDirectSoundBuffer_Play (dsb, 0, 0, DSBPLAY_LOOPING);
 436         if (FAILED (hr)) {
 437             dsound_logerr (hr, "Could not start playing buffer\n");
 438             return -1;
 439         }
 440         break;
 441
 442     case VOICE_DISABLE:
 443         if (dsound_get_status_out (dsb, &status, s)) {
 444             return -1;
 445         }
 446
 447         if (status & DSBSTATUS_PLAYING) {
 448             hr = IDirectSoundBuffer_Stop (dsb);
 449             if (FAILED (hr)) {
 450                 dsound_logerr (hr, "Could not stop playing buffer\n");
 451                 return -1;
 452             }
 453         }
 454         else {
 455             dolog ("warning: Voice is not playing\n");
 456         }
 457         break;
 458     }
 459     return 0;
 460 }
 461
 462 static int dsound_write (SWVoiceOut *sw, void *buf, int len)
 463 {
 464     return audio_pcm_sw_write (sw, buf, len);
 465 }
 466
 467 static int dsound_run_out (HWVoiceOut *hw, int live)
 468 {
 469     int err;
 470     HRESULT hr;
 471     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 472     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 473     int len, hwshift;
 474     DWORD blen1, blen2;
 475     DWORD len1, len2;
 476     DWORD decr;
 477     DWORD wpos, ppos, old_pos;
 478     LPVOID p1, p2;
 479     int bufsize;
 480     dsound *s = ds->s;
 481     DSoundConf *conf = &s->conf;
 482
 483     if (!dsb) {
 484         dolog ("Attempt to run empty with playback buffer\n");
 485         return 0;
 486     }
 487
 488     hwshift = hw->info.shift;
 489     bufsize = hw->samples << hwshift;
 490
 491     hr = IDirectSoundBuffer_GetCurrentPosition (
 492         dsb,
 493         &ppos,
 494         ds->first_time ? &wpos : NULL
 495         );
 496     if (FAILED (hr)) {
 497         dsound_logerr (hr, "Could not get playback buffer position\n");
 498         return 0;
 499     }
 500
 501     len = live << hwshift;
 502
 503     if (ds->first_time) {
 504         if (conf->latency_millis) {
 505             DWORD cur_blat;
 506
 507             cur_blat = audio_ring_dist (wpos, ppos, bufsize);
 508             ds->first_time = 0;
 509             old_pos = wpos;
 510             old_pos +=
 511                 millis_to_bytes (&hw->info, conf->latency_millis) - cur_blat;
 512             old_pos %= bufsize;
 513             old_pos &= ~hw->info.align;
 514         }
 515         else {
 516             old_pos = wpos;
 517         }
 518 #ifdef DEBUG_DSOUND
 519         ds->played = 0;
 520         ds->mixed = 0;
 521 #endif
 522     }
 523     else {
 524         if (ds->old_pos == ppos) {
 525 #ifdef DEBUG_DSOUND
 526             dolog ("old_pos == ppos\n");
 527 #endif
 528             return 0;
 529         }
 530
 531 #ifdef DEBUG_DSOUND
 532         ds->played += audio_ring_dist (ds->old_pos, ppos, hw->bufsize);
 533 #endif
 534         old_pos = ds->old_pos;
 535     }
 536
 537     if ((old_pos < ppos) && ((old_pos + len) > ppos)) {
 538         len = ppos - old_pos;
 539     }
 540     else {
 541         if ((old_pos > ppos) && ((old_pos + len) > (ppos + bufsize))) {
 542             len = bufsize - old_pos + ppos;
 543         }
 544     }
 545
 546     if (audio_bug(__func__, len < 0 || len > bufsize)) {
 547         dolog ("len=%d bufsize=%d old_pos=%ld ppos=%ld\n",
 548                len, bufsize, old_pos, ppos);
 549         return 0;
 550     }
 551
 552     len &= ~hw->info.align;
 553     if (!len) {
 554         return 0;
 555     }
 556
 557 #ifdef DEBUG_DSOUND
 558     ds->old_ppos = ppos;
 559 #endif
 560     err = dsound_lock_out (
 561         dsb,
 562         &hw->info,
 563         old_pos,
 564         len,
 565         &p1, &p2,
 566         &blen1, &blen2,
 567         0,
 568         s
 569         );
 570     if (err) {
 571         return 0;
 572     }
 573
 574     len1 = blen1 >> hwshift;
 575     len2 = blen2 >> hwshift;
 576     decr = len1 + len2;
 577
 578     if (p1 && len1) {
 579         dsound_write_sample (hw, p1, len1);
 580     }
 581
 582     if (p2 && len2) {
 583         dsound_write_sample (hw, p2, len2);
 584     }
 585
 586     dsound_unlock_out (dsb, p1, p2, blen1, blen2);
 587     ds->old_pos = (old_pos + (decr << hwshift)) % bufsize;
 588
 589 #ifdef DEBUG_DSOUND
 590     ds->mixed += decr << hwshift;
 591
 592     dolog ("played %lu mixed %lu diff %ld sec %f\n",
 593            ds->played,
 594            ds->mixed,
 595            ds->mixed - ds->played,
 596            abs (ds->mixed - ds->played) / (double) hw->info.bytes_per_second);
 597 #endif
 598     return decr;
 599 }
 600
 601 static int dsound_ctl_in (HWVoiceIn *hw, int cmd, ...)
 602 {
 603     HRESULT hr;
 604     DWORD status;
 605     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 606     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 607
 608     if (!dscb) {
 609         dolog ("Attempt to control capture voice without a buffer\n");
 610         return -1;
 611     }
 612
 613     switch (cmd) {
 614     case VOICE_ENABLE:
 615         if (dsound_get_status_in (dscb, &status)) {
 616             return -1;
 617         }
 618
 619         if (status & DSCBSTATUS_CAPTURING) {
 620             dolog ("warning: Voice is already capturing\n");
 621             return 0;
 622         }
 623
 624         /* clear ?? */
 625
 626         hr = IDirectSoundCaptureBuffer_Start (dscb, DSCBSTART_LOOPING);
 627         if (FAILED (hr)) {
 628             dsound_logerr (hr, "Could not start capturing\n");
 629             return -1;
 630         }
 631         break;
 632
 633     case VOICE_DISABLE:
 634         if (dsound_get_status_in (dscb, &status)) {
 635             return -1;
 636         }
 637
 638         if (status & DSCBSTATUS_CAPTURING) {
 639             hr = IDirectSoundCaptureBuffer_Stop (dscb);
 640             if (FAILED (hr)) {
 641                 dsound_logerr (hr, "Could not stop capturing\n");
 642                 return -1;
 643             }
 644         }
 645         else {
 646             dolog ("warning: Voice is not capturing\n");
 647         }
 648         break;
 649     }
 650     return 0;
 651 }
 652
 653 static int dsound_read (SWVoiceIn *sw, void *buf, int len)
 654 {
 655     return audio_pcm_sw_read (sw, buf, len);
 656 }
 657
 658 static int dsound_run_in (HWVoiceIn *hw)
 659 {
 660     int err;
 661     HRESULT hr;
 662     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 663     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 664     int live, len, dead;
 665     DWORD blen1, blen2;
 666     DWORD len1, len2;
 667     DWORD decr;
 668     DWORD cpos, rpos;
 669     LPVOID p1, p2;
 670     int hwshift;
 671     dsound *s = ds->s;
 672
 673     if (!dscb) {
 674         dolog ("Attempt to run without capture buffer\n");
 675         return 0;
 676     }
 677
 678     hwshift = hw->info.shift;
 679
 680     live = audio_pcm_hw_get_live_in (hw);
 681     dead = hw->samples - live;
 682     if (!dead) {
 683         return 0;
 684     }
 685
 686     hr = IDirectSoundCaptureBuffer_GetCurrentPosition (
 687         dscb,
 688         &cpos,
 689         ds->first_time ? &rpos : NULL
 690         );
 691     if (FAILED (hr)) {
 692         dsound_logerr (hr, "Could not get capture buffer position\n");
 693         return 0;
 694     }
 695
 696     if (ds->first_time) {
 697         ds->first_time = 0;
 698         if (rpos & hw->info.align) {
 699             ldebug ("warning: Misaligned capture read position %ld(%d)\n",
 700                     rpos, hw->info.align);
 701         }
 702         hw->wpos = rpos >> hwshift;
 703     }
 704
 705     if (cpos & hw->info.align) {
 706         ldebug ("warning: Misaligned capture position %ld(%d)\n",
 707                 cpos, hw->info.align);
 708     }
 709     cpos >>= hwshift;
 710
 711     len = audio_ring_dist (cpos, hw->wpos, hw->samples);
 712     if (!len) {
 713         return 0;
 714     }
 715     len = audio_MIN (len, dead);
 716
 717     err = dsound_lock_in (
 718         dscb,
 719         &hw->info,
 720         hw->wpos << hwshift,
 721         len << hwshift,
 722         &p1,
 723         &p2,
 724         &blen1,
 725         &blen2,
 726         0,
 727         s
 728         );
 729     if (err) {
 730         return 0;
 731     }
 732
 733     len1 = blen1 >> hwshift;
 734     len2 = blen2 >> hwshift;
 735     decr = len1 + len2;
 736
 737     if (p1 && len1) {
 738         hw->conv (hw->conv_buf + hw->wpos, p1, len1);
 739     }
 740
 741     if (p2 && len2) {
 742         hw->conv (hw->conv_buf, p2, len2);
 743     }
 744
 745     dsound_unlock_in (dscb, p1, p2, blen1, blen2);
 746     hw->wpos = (hw->wpos + decr) % hw->samples;
 747     return decr;
 748 }
 749
 750 static DSoundConf glob_conf = {
 751     .bufsize_in         = 16384,
 752     .bufsize_out        = 16384,
 753     .latency_millis     = 10
 754 };
 755
 756 static void dsound_audio_fini (void *opaque)
 757 {
 758     HRESULT hr;
 759     dsound *s = opaque;
 760
 761     if (!s->dsound) {
 762         g_free(s);
 763         return;
 764     }
 765
 766     hr = IDirectSound_Release (s->dsound);
 767     if (FAILED (hr)) {
 768         dsound_logerr (hr, "Could not release DirectSound\n");
 769     }
 770     s->dsound = NULL;
 771
 772     if (!s->dsound_capture) {
 773         g_free(s);
 774         return;
 775     }
 776
 777     hr = IDirectSoundCapture_Release (s->dsound_capture);
 778     if (FAILED (hr)) {
 779         dsound_logerr (hr, "Could not release DirectSoundCapture\n");
 780     }
 781     s->dsound_capture = NULL;
 782
 783     g_free(s);
 784 }
 785
 786 static void *dsound_audio_init (void)
 787 {
 788     int err;
 789     HRESULT hr;
 790     dsound *s = g_malloc0(sizeof(dsound));
 791
 792     s->conf = glob_conf;
 793     hr = CoInitialize (NULL);
 794     if (FAILED (hr)) {
 795         dsound_logerr (hr, "Could not initialize COM\n");
 796         g_free(s);
 797         return NULL;
 798     }
 799
 800     hr = CoCreateInstance (
 801         &CLSID_DirectSound,
 802         NULL,
 803         CLSCTX_ALL,
 804         &IID_IDirectSound,
 805         (void **) &s->dsound
 806         );
 807     if (FAILED (hr)) {
 808         dsound_logerr (hr, "Could not create DirectSound instance\n");
 809         g_free(s);
 810         return NULL;
 811     }
 812
 813     hr = IDirectSound_Initialize (s->dsound, NULL);
 814     if (FAILED (hr)) {
 815         dsound_logerr (hr, "Could not initialize DirectSound\n");
 816
 817         hr = IDirectSound_Release (s->dsound);
 818         if (FAILED (hr)) {
 819             dsound_logerr (hr, "Could not release DirectSound\n");
 820         }
 821         g_free(s);
 822         return NULL;
 823     }
 824
 825     hr = CoCreateInstance (
 826         &CLSID_DirectSoundCapture,
 827         NULL,
 828         CLSCTX_ALL,
 829         &IID_IDirectSoundCapture,
 830         (void **) &s->dsound_capture
 831         );
 832     if (FAILED (hr)) {
 833         dsound_logerr (hr, "Could not create DirectSoundCapture instance\n");
 834     }
 835     else {
 836         hr = IDirectSoundCapture_Initialize (s->dsound_capture, NULL);
 837         if (FAILED (hr)) {
 838             dsound_logerr (hr, "Could not initialize DirectSoundCapture\n");
 839
 840             hr = IDirectSoundCapture_Release (s->dsound_capture);
 841             if (FAILED (hr)) {
 842                 dsound_logerr (hr, "Could not release DirectSoundCapture\n");
 843             }
 844             s->dsound_capture = NULL;
 845         }
 846     }
 847
 848     err = dsound_open (s);
 849     if (err) {
 850         dsound_audio_fini (s);
 851         return NULL;
 852     }
 853
 854     return s;
 855 }
 856
 857 static struct audio_option dsound_options[] = {
 858     {
 859         .name  = "LATENCY_MILLIS",
 860         .tag   = AUD_OPT_INT,
 861         .valp  = &glob_conf.latency_millis,
 862         .descr = "(undocumented)"
 863     },
 864     {
 865         .name  = "BUFSIZE_OUT",
 866         .tag   = AUD_OPT_INT,
 867         .valp  = &glob_conf.bufsize_out,
 868         .descr = "(undocumented)"
 869     },
 870     {
 871         .name  = "BUFSIZE_IN",
 872         .tag   = AUD_OPT_INT,
 873         .valp  = &glob_conf.bufsize_in,
 874         .descr = "(undocumented)"
 875     },
 876     { /* End of list */ }
 877 };
 878
 879 static struct audio_pcm_ops dsound_pcm_ops = {
 880     .init_out = dsound_init_out,
 881     .fini_out = dsound_fini_out,
 882     .run_out  = dsound_run_out,
 883     .write    = dsound_write,
 884     .ctl_out  = dsound_ctl_out,
 885
 886     .init_in  = dsound_init_in,
 887     .fini_in  = dsound_fini_in,
 888     .run_in   = dsound_run_in,
 889     .read     = dsound_read,
 890     .ctl_in   = dsound_ctl_in
 891 };
 892
 893 static struct audio_driver dsound_audio_driver = {
 894     .name           = "dsound",
 895     .descr          = "DirectSound http://wikipedia.org/wiki/DirectSound",
 896     .options        = dsound_options,
 897     .init           = dsound_audio_init,
 898     .fini           = dsound_audio_fini,
 899     .pcm_ops        = &dsound_pcm_ops,
 900     .can_be_default = 1,
 901     .max_voices_out = INT_MAX,
 902     .max_voices_in  = 1,
 903     .voice_size_out = sizeof (DSoundVoiceOut),
 904     .voice_size_in  = sizeof (DSoundVoiceIn)
 905 };
 906
 907 static void register_audio_dsound(void)
 908 {
 909     audio_driver_register(&dsound_audio_driver);
 910 }
 911 type_init(register_audio_dsound);