git.oblomov.eu Git - wine/blob - dlls/winealsa.drv/dsoutput.c

   1 /*
   2  * Sample Wine Driver for Advanced Linux Sound System (ALSA)
   3  *      Based on version <final> of the ALSA API
   4  *
   5  * Copyright    2002 Eric Pouech
   6  *              2002 Marco Pietrobono
   7  *              2003 Christian Costa : WaveIn support
   8  *              2006-2007 Maarten Lankhorst
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  */
  24
  25 /*======================================================================*
  26  *              Low level dsound output implementation                  *
  27  *======================================================================*/
  28
  29 #include "config.h"
  30 #include "wine/port.h"
  31
  32 #include <stdlib.h>
  33 #include <assert.h>
  34 #include <stdarg.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #ifdef HAVE_UNISTD_H
  38 # include <unistd.h>
  39 #endif
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <fcntl.h>
  43 #ifdef HAVE_SYS_IOCTL_H
  44 # include <sys/ioctl.h>
  45 #endif
  46 #ifdef HAVE_SYS_MMAN_H
  47 # include <sys/mman.h>
  48 #endif
  49 #include "windef.h"
  50 #include "winbase.h"
  51 #include "wingdi.h"
  52 #include "winerror.h"
  53 #include "winuser.h"
  54 #include "mmddk.h"
  55
  56 #include "alsa.h"
  57 #include "wine/library.h"
  58 #include "wine/unicode.h"
  59 #include "wine/debug.h"
  60
  61 #ifdef HAVE_ALSA
  62
  63 WINE_DEFAULT_DEBUG_CHANNEL(dsalsa);
  64
  65 typedef struct IDsDriverImpl IDsDriverImpl;
  66 typedef struct IDsDriverBufferImpl IDsDriverBufferImpl;
  67
  68 struct IDsDriverImpl
  69 {
  70     /* IUnknown fields */
  71     const IDsDriverVtbl *lpVtbl;
  72     LONG ref;
  73
  74     /* IDsDriverImpl fields */
  75     IDsDriverBufferImpl* primary;
  76     UINT wDevID;
  77 };
  78
  79 struct IDsDriverBufferImpl
  80 {
  81     const IDsDriverBufferVtbl *lpVtbl;
  82     LONG ref;
  83     IDsDriverImpl* drv;
  84
  85     CRITICAL_SECTION pcm_crst;
  86     BYTE *mmap_buffer;
  87     DWORD mmap_buflen_bytes;
  88     BOOL mmap;
  89
  90     snd_pcm_t *pcm;
  91     snd_pcm_hw_params_t *hw_params;
  92     snd_pcm_sw_params_t *sw_params;
  93     snd_pcm_uframes_t mmap_buflen_frames, mmap_pos, mmap_commitahead;
  94 };
  95
  96 /** Fill buffers, for starting and stopping
  97  * Alsa won't start playing until everything is filled up
  98  * This also updates mmap_pos
  99  *
 100  * Returns: Amount of periods in use so snd_pcm_avail_update
 101  * doesn't have to be called up to 4x in GetPosition()
 102  */
 103 static snd_pcm_uframes_t CommitAll(IDsDriverBufferImpl *This)
 104 {
 105     const snd_pcm_channel_area_t *areas;
 106     snd_pcm_sframes_t used;
 107     const snd_pcm_uframes_t commitahead = This->mmap_commitahead;
 108
 109     used = This->mmap_buflen_frames - snd_pcm_avail_update(This->pcm);
 110     if (used < 0) used = 0;
 111     TRACE("%p needs to commit to %lu, used: %ld\n", This, commitahead, used);
 112     if (used < commitahead)
 113     {
 114         snd_pcm_sframes_t done;
 115         snd_pcm_uframes_t putin = commitahead - used;
 116         if (This->mmap)
 117         {
 118             snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &putin);
 119             done = snd_pcm_mmap_commit(This->pcm, This->mmap_pos, putin);
 120         }
 121         else
 122         {
 123             if (putin + This->mmap_pos > This->mmap_buflen_frames)
 124                 putin = This->mmap_buflen_frames - This->mmap_pos;
 125             done = snd_pcm_writei(This->pcm, This->mmap_buffer + snd_pcm_frames_to_bytes(This->pcm, This->mmap_pos), putin);
 126             if (done < putin) WARN("Short write %ld/%ld\n", putin, done);
 127         }
 128         if (done < 0) done = 0;
 129         This->mmap_pos += done;
 130         used += done;
 131         putin = commitahead - used;
 132
 133         if (This->mmap_pos == This->mmap_buflen_frames && (snd_pcm_sframes_t)putin > 0)
 134         {
 135             if (This->mmap)
 136             {
 137                 snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &putin);
 138                 done = snd_pcm_mmap_commit(This->pcm, This->mmap_pos, putin);
 139                 This->mmap_pos += done;
 140             }
 141             else
 142             {
 143                 done = snd_pcm_writei(This->pcm, This->mmap_buffer, putin);
 144                 if (done < putin) WARN("Short write %ld/%ld\n", putin, done);
 145                 if (done < 0) done = 0;
 146                 This->mmap_pos = done;
 147             }
 148             used += done;
 149         }
 150     }
 151
 152     if (This->mmap_pos == This->mmap_buflen_frames)
 153         This->mmap_pos = 0;
 154
 155     return used;
 156 }
 157
 158 static void CheckXRUN(IDsDriverBufferImpl* This)
 159 {
 160     snd_pcm_state_t state = snd_pcm_state(This->pcm);
 161     snd_pcm_sframes_t delay;
 162     int err;
 163
 164     snd_pcm_hwsync(This->pcm);
 165     snd_pcm_delay(This->pcm, &delay);
 166     if ( state == SND_PCM_STATE_XRUN )
 167     {
 168         err = snd_pcm_prepare(This->pcm);
 169         CommitAll(This);
 170         snd_pcm_start(This->pcm);
 171         WARN("xrun occurred\n");
 172         if ( err < 0 )
 173             ERR("recovery from xrun failed, prepare failed: %s\n", snd_strerror(err));
 174     }
 175     else if ( state == SND_PCM_STATE_SUSPENDED )
 176     {
 177         int err = snd_pcm_resume(This->pcm);
 178         TRACE("recovery from suspension occurred\n");
 179         if (err < 0 && err != -EAGAIN){
 180             err = snd_pcm_prepare(This->pcm);
 181             if (err < 0)
 182                 ERR("recovery from suspend failed, prepare failed: %s\n", snd_strerror(err));
 183         }
 184     } else if ( state != SND_PCM_STATE_RUNNING ) {
 185         FIXME("Unhandled state: %d\n", state);
 186     }
 187 }
 188
 189 /**
 190  * Allocate the memory-mapped buffer for direct sound, and set up the
 191  * callback.
 192  */
 193 static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
 194 {
 195     snd_pcm_t *pcm = pdbi->pcm;
 196     snd_pcm_format_t format;
 197     snd_pcm_uframes_t frames, ofs, avail, psize, boundary;
 198     unsigned int channels, bits_per_sample, bits_per_frame;
 199     int err, mmap_mode;
 200     const snd_pcm_channel_area_t *areas;
 201     snd_pcm_hw_params_t *hw_params = pdbi->hw_params;
 202     snd_pcm_sw_params_t *sw_params = pdbi->sw_params;
 203     void *buf;
 204
 205     mmap_mode = snd_pcm_type(pcm);
 206
 207     if (mmap_mode == SND_PCM_TYPE_HW)
 208         TRACE("mmap'd buffer is a direct hardware buffer.\n");
 209     else if (mmap_mode == SND_PCM_TYPE_DMIX)
 210         TRACE("mmap'd buffer is an ALSA dmix buffer\n");
 211     else
 212         TRACE("mmap'd buffer is an ALSA type %d buffer\n", mmap_mode);
 213
 214     err = snd_pcm_hw_params_get_period_size(hw_params, &psize, NULL);
 215
 216     err = snd_pcm_hw_params_get_format(hw_params, &format);
 217     err = snd_pcm_hw_params_get_buffer_size(hw_params, &frames);
 218     err = snd_pcm_hw_params_get_channels(hw_params, &channels);
 219     bits_per_sample = snd_pcm_format_physical_width(format);
 220     bits_per_frame = bits_per_sample * channels;
 221
 222     if (TRACE_ON(dsalsa))
 223         ALSA_TraceParameters(hw_params, NULL, FALSE);
 224
 225     TRACE("format=%s  frames=%ld  channels=%d  bits_per_sample=%d  bits_per_frame=%d\n",
 226           snd_pcm_format_name(format), frames, channels, bits_per_sample, bits_per_frame);
 227
 228     pdbi->mmap_buflen_frames = frames;
 229     pdbi->mmap_buflen_bytes = snd_pcm_frames_to_bytes( pcm, frames );
 230
 231     snd_pcm_sw_params_current(pcm, sw_params);
 232     snd_pcm_sw_params_set_start_threshold(pcm, sw_params, 0);
 233     snd_pcm_sw_params_get_boundary(sw_params, &boundary);
 234     snd_pcm_sw_params_set_stop_threshold(pcm, sw_params, boundary);
 235     snd_pcm_sw_params_set_silence_threshold(pcm, sw_params, boundary);
 236     snd_pcm_sw_params_set_silence_size(pcm, sw_params, 0);
 237     snd_pcm_sw_params_set_avail_min(pcm, sw_params, 0);
 238     err = snd_pcm_sw_params(pcm, sw_params);
 239
 240     avail = snd_pcm_avail_update(pcm);
 241     if ((snd_pcm_sframes_t)avail < 0)
 242     {
 243         ERR("No buffer is available: %s.\n", snd_strerror(avail));
 244         return DSERR_GENERIC;
 245     }
 246
 247     if (!pdbi->mmap)
 248     {
 249         buf = pdbi->mmap_buffer = HeapAlloc(GetProcessHeap(), 0, pdbi->mmap_buflen_bytes);
 250         if (!buf)
 251             return DSERR_OUTOFMEMORY;
 252
 253         snd_pcm_format_set_silence(format, buf, pdbi->mmap_buflen_frames);
 254         pdbi->mmap_pos = 0;
 255     }
 256     else
 257     {
 258         err = snd_pcm_mmap_begin(pcm, &areas, &ofs, &avail);
 259         if ( err < 0 )
 260         {
 261             ERR("Can't map sound device for direct access: %s/%d\n", snd_strerror(err), err);
 262             return DSERR_GENERIC;
 263         }
 264         snd_pcm_format_set_silence(format, areas->addr, pdbi->mmap_buflen_frames);
 265         pdbi->mmap_pos = ofs + snd_pcm_mmap_commit(pcm, ofs, 0);
 266         pdbi->mmap_buffer = areas->addr;
 267     }
 268
 269     TRACE("created mmap buffer of %ld frames (%d bytes) at %p\n",
 270         frames, pdbi->mmap_buflen_bytes, pdbi->mmap_buffer);
 271
 272     return DS_OK;
 273 }
 274
 275 static HRESULT WINAPI IDsDriverBufferImpl_QueryInterface(PIDSDRIVERBUFFER iface, REFIID riid, LPVOID *ppobj)
 276 {
 277     /* IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface; */
 278     FIXME("(): stub!\n");
 279     return DSERR_UNSUPPORTED;
 280 }
 281
 282 static ULONG WINAPI IDsDriverBufferImpl_AddRef(PIDSDRIVERBUFFER iface)
 283 {
 284     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 285     ULONG refCount = InterlockedIncrement(&This->ref);
 286
 287     TRACE("(%p)->(ref before=%u)\n",This, refCount - 1);
 288
 289     return refCount;
 290 }
 291
 292 static ULONG WINAPI IDsDriverBufferImpl_Release(PIDSDRIVERBUFFER iface)
 293 {
 294     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 295     ULONG refCount = InterlockedDecrement(&This->ref);
 296
 297     TRACE("(%p)->(ref before=%u)\n",This, refCount + 1);
 298
 299     if (refCount)
 300         return refCount;
 301
 302     TRACE("mmap buffer %p destroyed\n", This->mmap_buffer);
 303
 304     if (This == This->drv->primary)
 305         This->drv->primary = NULL;
 306
 307     This->pcm_crst.DebugInfo->Spare[0] = 0;
 308     DeleteCriticalSection(&This->pcm_crst);
 309
 310     snd_pcm_drop(This->pcm);
 311     snd_pcm_close(This->pcm);
 312     This->pcm = NULL;
 313     HeapFree(GetProcessHeap(), 0, This->sw_params);
 314     HeapFree(GetProcessHeap(), 0, This->hw_params);
 315     if (!This->mmap)
 316         HeapFree(GetProcessHeap(), 0, This->mmap_buffer);
 317     HeapFree(GetProcessHeap(), 0, This);
 318     return 0;
 319 }
 320
 321 static HRESULT WINAPI IDsDriverBufferImpl_Lock(PIDSDRIVERBUFFER iface,
 322                                                LPVOID*ppvAudio1,LPDWORD pdwLen1,
 323                                                LPVOID*ppvAudio2,LPDWORD pdwLen2,
 324                                                DWORD dwWritePosition,DWORD dwWriteLen,
 325                                                DWORD dwFlags)
 326 {
 327     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 328     snd_pcm_uframes_t writepos;
 329
 330     TRACE("%d bytes from %d\n", dwWriteLen, dwWritePosition);
 331
 332     /* **** */
 333     EnterCriticalSection(&This->pcm_crst);
 334
 335     if (dwFlags & DSBLOCK_ENTIREBUFFER)
 336         dwWriteLen = This->mmap_buflen_bytes;
 337
 338     if (dwWriteLen > This->mmap_buflen_bytes || dwWritePosition >= This->mmap_buflen_bytes)
 339     {
 340         /* **** */
 341         LeaveCriticalSection(&This->pcm_crst);
 342         return DSERR_INVALIDPARAM;
 343     }
 344
 345     if (ppvAudio2) *ppvAudio2 = NULL;
 346     if (pdwLen2) *pdwLen2 = 0;
 347
 348     *ppvAudio1 = This->mmap_buffer + dwWritePosition;
 349     *pdwLen1 = dwWriteLen;
 350
 351     if (dwWritePosition+dwWriteLen > This->mmap_buflen_bytes)
 352     {
 353         DWORD remainder = This->mmap_buflen_bytes - dwWritePosition;
 354         *pdwLen1 = remainder;
 355
 356         if (ppvAudio2 && pdwLen2)
 357         {
 358             *ppvAudio2 = This->mmap_buffer;
 359             *pdwLen2 = dwWriteLen - remainder;
 360         }
 361         else dwWriteLen = remainder;
 362     }
 363
 364     writepos = snd_pcm_bytes_to_frames(This->pcm, dwWritePosition);
 365     if (writepos == This->mmap_pos)
 366     {
 367         const snd_pcm_channel_area_t *areas;
 368         snd_pcm_uframes_t writelen = snd_pcm_bytes_to_frames(This->pcm, dwWriteLen), putin = writelen;
 369         TRACE("Hit mmap_pos, locking data!\n");
 370         if (This->mmap)
 371             snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &putin);
 372     }
 373     else
 374         WARN("mmap_pos (%lu) != writepos (%lu) not locking data!\n", This->mmap_pos, writepos);
 375
 376     LeaveCriticalSection(&This->pcm_crst);
 377     /* **** */
 378     return DS_OK;
 379 }
 380
 381 static HRESULT WINAPI IDsDriverBufferImpl_Unlock(PIDSDRIVERBUFFER iface,
 382                                                  LPVOID pvAudio1,DWORD dwLen1,
 383                                                  LPVOID pvAudio2,DWORD dwLen2)
 384 {
 385     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 386     snd_pcm_uframes_t writepos;
 387
 388     if (!dwLen1)
 389         return DS_OK;
 390
 391     /* **** */
 392     EnterCriticalSection(&This->pcm_crst);
 393
 394     writepos = snd_pcm_bytes_to_frames(This->pcm, (DWORD_PTR)pvAudio1 - (DWORD_PTR)This->mmap_buffer);
 395     if (writepos == This->mmap_pos)
 396     {
 397         const snd_pcm_channel_area_t *areas;
 398         snd_pcm_uframes_t writelen = snd_pcm_bytes_to_frames(This->pcm, dwLen1);
 399         TRACE("Committing data\n");
 400         if (This->mmap)
 401             This->mmap_pos += snd_pcm_mmap_commit(This->pcm, This->mmap_pos, writelen);
 402         else
 403         {
 404             int ret;
 405             ret = snd_pcm_writei(This->pcm, pvAudio1, writelen);
 406             if (ret == -EPIPE)
 407             {
 408                 WARN("Underrun occurred\n");
 409                 snd_pcm_recover(This->pcm, -EPIPE, 1);
 410                 ret = snd_pcm_writei(This->pcm, pvAudio1, writelen);
 411
 412                 /* Advance mmap pointer a little to make dsound notice the underrun and respond to it */
 413                 if (ret < writelen) WARN("Short write %ld/%d\n", writelen, ret);
 414                 This->mmap_pos += This->mmap_commitahead + ret;
 415                 This->mmap_pos %= This->mmap_buflen_frames;
 416             }
 417             else if (ret > 0)
 418                 This->mmap_pos += ret;
 419             if (ret < 0)
 420                 WARN("Committing data: %d / %s (%p %ld)\n", ret, snd_strerror(ret), pvAudio1, writelen);
 421         }
 422
 423         if (This->mmap_pos == This->mmap_buflen_frames)
 424             This->mmap_pos = 0;
 425         if (dwLen2)
 426         {
 427             writelen = snd_pcm_bytes_to_frames(This->pcm, dwLen2);
 428             if (This->mmap)
 429             {
 430                 snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &writelen);
 431                 This->mmap_pos += snd_pcm_mmap_commit(This->pcm, This->mmap_pos, writelen);
 432             }
 433             else
 434             {
 435                 int ret;
 436                 ret = snd_pcm_writei(This->pcm, pvAudio2, writelen);
 437                 if (ret < writelen) WARN("Short write %ld/%d\n", writelen, ret);
 438                 This->mmap_pos = ret > 0 ? ret : 0;
 439             }
 440             assert(This->mmap_pos < This->mmap_buflen_frames);
 441         }
 442     }
 443     LeaveCriticalSection(&This->pcm_crst);
 444     /* **** */
 445
 446     return DS_OK;
 447 }
 448
 449 static HRESULT SetFormat(IDsDriverBufferImpl *This, LPWAVEFORMATEX pwfx)
 450 {
 451     snd_pcm_t *pcm = NULL;
 452     snd_pcm_hw_params_t *hw_params = This->hw_params;
 453     unsigned int buffer_time = 500000;
 454     snd_pcm_format_t format = -1;
 455     snd_pcm_uframes_t psize;
 456     DWORD rate = pwfx->nSamplesPerSec;
 457     int err=0;
 458
 459     switch (pwfx->wBitsPerSample)
 460     {
 461         case  8: format = SND_PCM_FORMAT_U8; break;
 462         case 16: format = SND_PCM_FORMAT_S16_LE; break;
 463         case 24: format = SND_PCM_FORMAT_S24_3LE; break;
 464         case 32: format = SND_PCM_FORMAT_S32_LE; break;
 465         default: FIXME("Unsupported bpp: %d\n", pwfx->wBitsPerSample); return DSERR_GENERIC;
 466     }
 467
 468     err = snd_pcm_open(&pcm, WOutDev[This->drv->wDevID].pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 469     if (err < 0)
 470     {
 471         if (errno != EBUSY || !This->pcm)
 472         {
 473             WARN("Cannot open sound device: %s\n", snd_strerror(err));
 474             return DSERR_GENERIC;
 475         }
 476         snd_pcm_drop(This->pcm);
 477         snd_pcm_close(This->pcm);
 478         This->pcm = NULL;
 479         err = snd_pcm_open(&pcm, WOutDev[This->drv->wDevID].pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 480         if (err < 0)
 481         {
 482             WARN("Cannot open sound device: %s\n", snd_strerror(err));
 483             return DSERR_BUFFERLOST;
 484         }
 485     }
 486
 487     /* Set some defaults */
 488     snd_pcm_hw_params_any(pcm, hw_params);
 489     err = snd_pcm_hw_params_set_channels(pcm, hw_params, pwfx->nChannels);
 490     if (err < 0) { WARN("Could not set channels to %d\n", pwfx->nChannels); goto err; }
 491
 492     err = snd_pcm_hw_params_set_format(pcm, hw_params, format);
 493     if (err < 0) { WARN("Could not set format to %d bpp\n", pwfx->wBitsPerSample); goto err; }
 494
 495     /* Alsa's rate resampling is only used if the application specifically requests
 496      * a buffer at a certain frequency, else it is better to disable it due to unwanted
 497      * side effects, which may include: Less granular pointer, changing buffer sizes, etc
 498      */
 499 #if SND_LIB_VERSION >= 0x010009
 500     snd_pcm_hw_params_set_rate_resample(pcm, hw_params, 0);
 501 #endif
 502
 503     err = snd_pcm_hw_params_set_rate_near(pcm, hw_params, &rate, NULL);
 504     if (err < 0) { rate = pwfx->nSamplesPerSec; WARN("Could not set rate\n"); goto err; }
 505
 506     if (!ALSA_NearMatch(rate, pwfx->nSamplesPerSec))
 507     {
 508         WARN("Could not set sound rate to %d, but instead to %d\n", pwfx->nSamplesPerSec, rate);
 509         pwfx->nSamplesPerSec = rate;
 510         pwfx->nAvgBytesPerSec = rate * pwfx->nBlockAlign;
 511         /* Let DirectSound detect this */
 512     }
 513
 514     snd_pcm_hw_params_set_periods_integer(pcm, hw_params);
 515     snd_pcm_hw_params_set_buffer_time_near(pcm, hw_params, &buffer_time, NULL);
 516     buffer_time = 10000;
 517     snd_pcm_hw_params_set_period_time_near(pcm, hw_params, &buffer_time, NULL);
 518
 519     err = snd_pcm_hw_params_get_period_size(hw_params, &psize, NULL);
 520     buffer_time = 16;
 521     snd_pcm_hw_params_set_periods_near(pcm, hw_params, &buffer_time, NULL);
 522
 523     if (!This->mmap)
 524     {
 525         HeapFree(GetProcessHeap(), 0, This->mmap_buffer);
 526         This->mmap_buffer = NULL;
 527     }
 528
 529     err = snd_pcm_hw_params_set_access (pcm, hw_params, SND_PCM_ACCESS_MMAP_INTERLEAVED);
 530     if (err >= 0)
 531         This->mmap = 1;
 532     else
 533     {
 534         This->mmap = 0;
 535         err = snd_pcm_hw_params_set_access (pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
 536     }
 537
 538     err = snd_pcm_hw_params(pcm, hw_params);
 539     err = snd_pcm_sw_params(pcm, This->sw_params);
 540     snd_pcm_prepare(pcm);
 541
 542     /* ALSA needs at least 3 buffers to work successfully */
 543     This->mmap_commitahead = 3 * psize;
 544     while (This->mmap_commitahead <= 512)
 545         This->mmap_commitahead += psize;
 546
 547     if (This->pcm)
 548     {
 549         snd_pcm_drop(This->pcm);
 550         snd_pcm_close(This->pcm);
 551     }
 552     This->pcm = pcm;
 553     snd_pcm_prepare(This->pcm);
 554     DSDB_CreateMMAP(This);
 555     return S_OK;
 556
 557     err:
 558     if (err < 0)
 559         WARN("Failed to apply changes: %s\n", snd_strerror(err));
 560
 561     if (!This->pcm)
 562         This->pcm = pcm;
 563     else
 564         snd_pcm_close(pcm);
 565
 566     if (This->pcm)
 567         snd_pcm_hw_params_current(This->pcm, This->hw_params);
 568
 569     return DSERR_BADFORMAT;
 570 }
 571
 572 static HRESULT WINAPI IDsDriverBufferImpl_SetFormat(PIDSDRIVERBUFFER iface, LPWAVEFORMATEX pwfx)
 573 {
 574     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 575     HRESULT hr = S_OK;
 576
 577     TRACE("(%p, %p)\n", iface, pwfx);
 578
 579     /* **** */
 580     EnterCriticalSection(&This->pcm_crst);
 581     hr = SetFormat(This, pwfx);
 582     /* **** */
 583     LeaveCriticalSection(&This->pcm_crst);
 584
 585     if (hr == DS_OK)
 586         return S_FALSE;
 587     return hr;
 588 }
 589
 590 static HRESULT WINAPI IDsDriverBufferImpl_SetFrequency(PIDSDRIVERBUFFER iface, DWORD dwFreq)
 591 {
 592     /* IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface; */
 593     FIXME("(%p,%d): stub\n",iface,dwFreq);
 594     return S_OK;
 595 }
 596
 597 static HRESULT WINAPI IDsDriverBufferImpl_SetVolumePan(PIDSDRIVERBUFFER iface, PDSVOLUMEPAN pVolPan)
 598 {
 599     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 600     FIXME("(%p,%p): stub\n",This,pVolPan);
 601     /* TODO: Bring volume control back */
 602     return DS_OK;
 603 }
 604
 605 static HRESULT WINAPI IDsDriverBufferImpl_SetPosition(PIDSDRIVERBUFFER iface, DWORD dwNewPos)
 606 {
 607     /* IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface; */
 608     /* I don't even think alsa allows this */
 609     FIXME("(%p,%d): stub\n",iface,dwNewPos);
 610     return DSERR_UNSUPPORTED;
 611 }
 612
 613 static HRESULT WINAPI IDsDriverBufferImpl_GetPosition(PIDSDRIVERBUFFER iface,
 614                                                       LPDWORD lpdwPlay, LPDWORD lpdwWrite)
 615 {
 616     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 617     snd_pcm_uframes_t hw_pptr, hw_wptr;
 618     snd_pcm_state_t state;
 619
 620     /* **** */
 621     EnterCriticalSection(&This->pcm_crst);
 622
 623     if (!This->pcm)
 624     {
 625         FIXME("Bad pointer for pcm: %p\n", This->pcm);
 626         LeaveCriticalSection(&This->pcm_crst);
 627         return DSERR_GENERIC;
 628     }
 629
 630     if (!lpdwPlay && !lpdwWrite)
 631         CommitAll(This);
 632
 633     state = snd_pcm_state(This->pcm);
 634
 635     if (state != SND_PCM_STATE_PREPARED && state != SND_PCM_STATE_RUNNING)
 636     {
 637         CheckXRUN(This);
 638         state = snd_pcm_state(This->pcm);
 639     }
 640     if (state == SND_PCM_STATE_RUNNING)
 641     {
 642         snd_pcm_sframes_t used = This->mmap_buflen_frames - snd_pcm_avail_update(This->pcm);
 643
 644         if (used < 0)
 645         {
 646             WARN("Underrun: %ld / %ld\n", used, snd_pcm_avail_update(This->pcm));
 647             if (This->mmap)
 648             {
 649                 snd_pcm_forward(This->pcm, -used);
 650                 This->mmap_pos += -used;
 651                 This->mmap_pos %= This->mmap_buflen_frames;
 652             }
 653             used = 0;
 654         }
 655
 656         if (This->mmap_pos > used)
 657             hw_pptr = This->mmap_pos - used;
 658         else
 659             hw_pptr = This->mmap_buflen_frames + This->mmap_pos - used;
 660         hw_pptr %= This->mmap_buflen_frames;
 661
 662         TRACE("At position: %ld (%ld) - Used %ld\n", hw_pptr, This->mmap_pos, used);
 663     }
 664     else hw_pptr = This->mmap_pos;
 665     hw_wptr = This->mmap_pos;
 666
 667     LeaveCriticalSection(&This->pcm_crst);
 668     /* **** */
 669
 670     if (lpdwPlay)
 671         *lpdwPlay = snd_pcm_frames_to_bytes(This->pcm, hw_pptr);
 672     if (lpdwWrite)
 673         *lpdwWrite = snd_pcm_frames_to_bytes(This->pcm, hw_wptr);
 674
 675     TRACE("hw_pptr=0x%08x, hw_wptr=0x%08x playpos=%d, writepos=%d\n", (unsigned int)hw_pptr, (unsigned int)hw_wptr, lpdwPlay?*lpdwPlay:-1, lpdwWrite?*lpdwWrite:-1);
 676     return DS_OK;
 677 }
 678
 679 static HRESULT WINAPI IDsDriverBufferImpl_Play(PIDSDRIVERBUFFER iface, DWORD dwRes1, DWORD dwRes2, DWORD dwFlags)
 680 {
 681     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 682     TRACE("(%p,%x,%x,%x)\n",iface,dwRes1,dwRes2,dwFlags);
 683
 684     /* **** */
 685     EnterCriticalSection(&This->pcm_crst);
 686     snd_pcm_start(This->pcm);
 687     /* **** */
 688     LeaveCriticalSection(&This->pcm_crst);
 689     return DS_OK;
 690 }
 691
 692 static HRESULT WINAPI IDsDriverBufferImpl_Stop(PIDSDRIVERBUFFER iface)
 693 {
 694     const snd_pcm_channel_area_t *areas;
 695     snd_pcm_uframes_t avail;
 696     snd_pcm_format_t format;
 697     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 698     TRACE("(%p)\n",iface);
 699
 700     /* **** */
 701     EnterCriticalSection(&This->pcm_crst);
 702     avail = This->mmap_buflen_frames;
 703     snd_pcm_drop(This->pcm);
 704     snd_pcm_prepare(This->pcm);
 705     avail = snd_pcm_avail_update(This->pcm);
 706     snd_pcm_hw_params_get_format(This->hw_params, &format);
 707     if (This->mmap)
 708     {
 709         snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &avail);
 710         snd_pcm_format_set_silence(format, areas->addr, This->mmap_buflen_frames);
 711         snd_pcm_mmap_commit(This->pcm, This->mmap_pos, 0);
 712     }
 713     else
 714     {
 715         snd_pcm_format_set_silence(format, This->mmap_buffer, This->mmap_buflen_frames);
 716         snd_pcm_writei(This->pcm, This->mmap_buffer, This->mmap_buflen_frames);
 717         This->mmap_pos = 0;
 718     }
 719
 720     /* **** */
 721     LeaveCriticalSection(&This->pcm_crst);
 722     return DS_OK;
 723 }
 724
 725 static const IDsDriverBufferVtbl dsdbvt =
 726 {
 727     IDsDriverBufferImpl_QueryInterface,
 728     IDsDriverBufferImpl_AddRef,
 729     IDsDriverBufferImpl_Release,
 730     IDsDriverBufferImpl_Lock,
 731     IDsDriverBufferImpl_Unlock,
 732     IDsDriverBufferImpl_SetFormat,
 733     IDsDriverBufferImpl_SetFrequency,
 734     IDsDriverBufferImpl_SetVolumePan,
 735     IDsDriverBufferImpl_SetPosition,
 736     IDsDriverBufferImpl_GetPosition,
 737     IDsDriverBufferImpl_Play,
 738     IDsDriverBufferImpl_Stop
 739 };
 740
 741 static HRESULT WINAPI IDsDriverImpl_QueryInterface(PIDSDRIVER iface, REFIID riid, LPVOID *ppobj)
 742 {
 743     /* IDsDriverImpl *This = (IDsDriverImpl *)iface; */
 744     FIXME("(%p): stub!\n",iface);
 745     return DSERR_UNSUPPORTED;
 746 }
 747
 748 static ULONG WINAPI IDsDriverImpl_AddRef(PIDSDRIVER iface)
 749 {
 750     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 751     ULONG refCount = InterlockedIncrement(&This->ref);
 752
 753     TRACE("(%p)->(ref before=%u)\n",This, refCount - 1);
 754
 755     return refCount;
 756 }
 757
 758 static ULONG WINAPI IDsDriverImpl_Release(PIDSDRIVER iface)
 759 {
 760     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 761     ULONG refCount = InterlockedDecrement(&This->ref);
 762
 763     TRACE("(%p)->(ref before=%u)\n",This, refCount + 1);
 764
 765     if (refCount)
 766         return refCount;
 767
 768     HeapFree(GetProcessHeap(), 0, This);
 769     return 0;
 770 }
 771
 772 static HRESULT WINAPI IDsDriverImpl_GetDriverDesc(PIDSDRIVER iface, PDSDRIVERDESC pDesc)
 773 {
 774     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 775     TRACE("(%p,%p)\n",iface,pDesc);
 776     *pDesc                      = WOutDev[This->wDevID].ds_desc;
 777     pDesc->dwFlags              = DSDDESC_DONTNEEDSECONDARYLOCK | DSDDESC_DONTNEEDWRITELEAD;
 778     pDesc->dnDevNode            = WOutDev[This->wDevID].waveDesc.dnDevNode;
 779     pDesc->wVxdId               = 0;
 780     pDesc->wReserved            = 0;
 781     pDesc->ulDeviceNum          = This->wDevID;
 782     pDesc->dwHeapType           = DSDHEAP_NOHEAP;
 783     pDesc->pvDirectDrawHeap     = NULL;
 784     pDesc->dwMemStartAddress    = 0xDEAD0000;
 785     pDesc->dwMemEndAddress      = 0xDEAF0000;
 786     pDesc->dwMemAllocExtra      = 0;
 787     pDesc->pvReserved1          = NULL;
 788     pDesc->pvReserved2          = NULL;
 789     return DS_OK;
 790 }
 791
 792 static HRESULT WINAPI IDsDriverImpl_Open(PIDSDRIVER iface)
 793 {
 794     HRESULT hr = S_OK;
 795     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 796     int err=0;
 797     snd_pcm_t *pcm = NULL;
 798     snd_pcm_hw_params_t *hw_params;
 799
 800     /* While this is not really needed, it is a good idea to do this,
 801      * to see if sound can be initialized */
 802
 803     hw_params = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_hw_params_sizeof());
 804
 805     if (!hw_params)
 806     {
 807         hr = DSERR_OUTOFMEMORY;
 808         goto unalloc;
 809     }
 810
 811     err = snd_pcm_open(&pcm, WOutDev[This->wDevID].pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 812     if (err < 0) goto err;
 813     err = snd_pcm_hw_params_any(pcm, hw_params);
 814     if (err < 0) goto err;
 815     err = snd_pcm_hw_params_set_access (pcm, hw_params, SND_PCM_ACCESS_MMAP_INTERLEAVED);
 816     if (err < 0)
 817         err = snd_pcm_hw_params_set_access (pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
 818     if (err < 0) goto err;
 819
 820     TRACE("Success\n");
 821     snd_pcm_close(pcm);
 822     goto unalloc;
 823
 824     err:
 825     hr = DSERR_GENERIC;
 826     FIXME("Failed to open device: %s\n", snd_strerror(err));
 827     if (pcm)
 828         snd_pcm_close(pcm);
 829     unalloc:
 830     HeapFree(GetProcessHeap(), 0, hw_params);
 831     if (hr != S_OK)
 832         WARN("--> %08x\n", hr);
 833     return hr;
 834 }
 835
 836 static HRESULT WINAPI IDsDriverImpl_Close(PIDSDRIVER iface)
 837 {
 838     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 839     TRACE("(%p) stub, harmless\n",This);
 840     return DS_OK;
 841 }
 842
 843 static HRESULT WINAPI IDsDriverImpl_GetCaps(PIDSDRIVER iface, PDSDRIVERCAPS pCaps)
 844 {
 845     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 846     TRACE("(%p,%p)\n",iface,pCaps);
 847     *pCaps = WOutDev[This->wDevID].ds_caps;
 848     return DS_OK;
 849 }
 850
 851 static HRESULT WINAPI IDsDriverImpl_CreateSoundBuffer(PIDSDRIVER iface,
 852                                                       LPWAVEFORMATEX pwfx,
 853                                                       DWORD dwFlags, DWORD dwCardAddress,
 854                                                       LPDWORD pdwcbBufferSize,
 855                                                       LPBYTE *ppbBuffer,
 856                                                       LPVOID *ppvObj)
 857 {
 858     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 859     IDsDriverBufferImpl** ippdsdb = (IDsDriverBufferImpl**)ppvObj;
 860     HRESULT err;
 861
 862     TRACE("(%p,%p,%x,%x)\n",iface,pwfx,dwFlags,dwCardAddress);
 863     /* we only support primary buffers... for now */
 864     if (!(dwFlags & DSBCAPS_PRIMARYBUFFER))
 865         return DSERR_UNSUPPORTED;
 866     if (This->primary)
 867         return DSERR_ALLOCATED;
 868
 869     *ippdsdb = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDsDriverBufferImpl));
 870     if (*ippdsdb == NULL)
 871         return DSERR_OUTOFMEMORY;
 872
 873     (*ippdsdb)->hw_params = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_hw_params_sizeof());
 874     (*ippdsdb)->sw_params = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_sw_params_sizeof());
 875     if (!(*ippdsdb)->hw_params || !(*ippdsdb)->sw_params)
 876     {
 877         HeapFree(GetProcessHeap(), 0, (*ippdsdb)->sw_params);
 878         HeapFree(GetProcessHeap(), 0, (*ippdsdb)->hw_params);
 879         return DSERR_OUTOFMEMORY;
 880     }
 881     (*ippdsdb)->lpVtbl  = &dsdbvt;
 882     (*ippdsdb)->ref     = 1;
 883     (*ippdsdb)->drv     = This;
 884     InitializeCriticalSection(&(*ippdsdb)->pcm_crst);
 885     (*ippdsdb)->pcm_crst.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": ALSA_DSOUTPUT.pcm_crst");
 886
 887     /* SetFormat has to re-initialize pcm here anyway */
 888     err = SetFormat(*ippdsdb, pwfx);
 889     if (FAILED(err))
 890     {
 891         WARN("Error occurred: %08x\n", err);
 892         goto err;
 893     }
 894
 895     if (dwFlags & DSBCAPS_PRIMARYBUFFER)
 896         This->primary = *ippdsdb;
 897
 898     *pdwcbBufferSize = (*ippdsdb)->mmap_buflen_bytes;
 899     *ppbBuffer = (*ippdsdb)->mmap_buffer;
 900
 901     /* buffer is ready to go */
 902     TRACE("buffer created at %p\n", *ippdsdb);
 903     return err;
 904
 905     err:
 906     HeapFree(GetProcessHeap(), 0, (*ippdsdb)->sw_params);
 907     HeapFree(GetProcessHeap(), 0, (*ippdsdb)->hw_params);
 908     HeapFree(GetProcessHeap(), 0, *ippdsdb);
 909     *ippdsdb = NULL;
 910     return err;
 911 }
 912
 913 static HRESULT WINAPI IDsDriverImpl_DuplicateSoundBuffer(PIDSDRIVER iface,
 914                                                          PIDSDRIVERBUFFER pBuffer,
 915                                                          LPVOID *ppvObj)
 916 {
 917     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 918     FIXME("(%p,%p): stub\n",This,pBuffer);
 919     return DSERR_INVALIDCALL;
 920 }
 921
 922 static const IDsDriverVtbl dsdvt =
 923 {
 924     IDsDriverImpl_QueryInterface,
 925     IDsDriverImpl_AddRef,
 926     IDsDriverImpl_Release,
 927     IDsDriverImpl_GetDriverDesc,
 928     IDsDriverImpl_Open,
 929     IDsDriverImpl_Close,
 930     IDsDriverImpl_GetCaps,
 931     IDsDriverImpl_CreateSoundBuffer,
 932     IDsDriverImpl_DuplicateSoundBuffer
 933 };
 934
 935 DWORD wodDsCreate(UINT wDevID, PIDSDRIVER* drv)
 936 {
 937     IDsDriverImpl** idrv = (IDsDriverImpl**)drv;
 938
 939     TRACE("driver created\n");
 940
 941     *idrv = HeapAlloc(GetProcessHeap(),0,sizeof(IDsDriverImpl));
 942     if (!*idrv)
 943         return MMSYSERR_NOMEM;
 944     (*idrv)->lpVtbl     = &dsdvt;
 945     (*idrv)->ref        = 1;
 946
 947     (*idrv)->wDevID     = wDevID;
 948     (*idrv)->primary    = NULL;
 949     return MMSYSERR_NOERROR;
 950 }
 951
 952 DWORD wodDsDesc(UINT wDevID, PDSDRIVERDESC desc)
 953 {
 954     *desc = WOutDev[wDevID].ds_desc;
 955     return MMSYSERR_NOERROR;
 956 }
 957
 958 #endif /* HAVE_ALSA */