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     LPVOID mmap_buffer;
  87     DWORD mmap_buflen_bytes;
  88
  89     snd_pcm_t *pcm;
  90     snd_pcm_hw_params_t *hw_params;
  91     snd_pcm_sw_params_t *sw_params;
  92     snd_pcm_uframes_t mmap_buflen_frames, mmap_pos, mmap_commitahead;
  93 };
  94
  95 /** Fill buffers, for starting and stopping
  96  * Alsa won't start playing until everything is filled up
  97  * This also updates mmap_pos
  98  *
  99  * Returns: Amount of periods in use so snd_pcm_avail_update
 100  * doesn't have to be called up to 4x in GetPosition()
 101  */
 102 static snd_pcm_uframes_t CommitAll(IDsDriverBufferImpl *This)
 103 {
 104     const snd_pcm_channel_area_t *areas;
 105     snd_pcm_uframes_t used;
 106     const snd_pcm_uframes_t commitahead = This->mmap_commitahead;
 107
 108     used = This->mmap_buflen_frames - snd_pcm_avail_update(This->pcm);
 109     TRACE("%p needs to commit to %lu, used: %lu\n", This, commitahead, used);
 110     if (used < commitahead)
 111     {
 112         snd_pcm_uframes_t done, putin = commitahead - used;
 113         snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &putin);
 114         done = snd_pcm_mmap_commit(This->pcm, This->mmap_pos, putin);
 115         This->mmap_pos += done;
 116         used += done;
 117         putin = commitahead - used;
 118
 119         if (This->mmap_pos == This->mmap_buflen_frames && (snd_pcm_sframes_t)putin > 0)
 120         {
 121             snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &putin);
 122             done = snd_pcm_mmap_commit(This->pcm, This->mmap_pos, putin);
 123             This->mmap_pos += done;
 124             used += done;
 125         }
 126     }
 127
 128     if (This->mmap_pos == This->mmap_buflen_frames)
 129         This->mmap_pos = 0;
 130
 131     return used;
 132 }
 133
 134 static void CheckXRUN(IDsDriverBufferImpl* This)
 135 {
 136     snd_pcm_state_t state = snd_pcm_state(This->pcm);
 137     snd_pcm_sframes_t delay;
 138     int err;
 139
 140     snd_pcm_hwsync(This->pcm);
 141     snd_pcm_delay(This->pcm, &delay);
 142     if ( state == SND_PCM_STATE_XRUN )
 143     {
 144         err = snd_pcm_prepare(This->pcm);
 145         CommitAll(This);
 146         snd_pcm_start(This->pcm);
 147         WARN("xrun occurred\n");
 148         if ( err < 0 )
 149             ERR("recovery from xrun failed, prepare failed: %s\n", snd_strerror(err));
 150     }
 151     else if ( state == SND_PCM_STATE_SUSPENDED )
 152     {
 153         int err = snd_pcm_resume(This->pcm);
 154         TRACE("recovery from suspension occurred\n");
 155         if (err < 0 && err != -EAGAIN){
 156             err = snd_pcm_prepare(This->pcm);
 157             if (err < 0)
 158                 ERR("recovery from suspend failed, prepare failed: %s\n", snd_strerror(err));
 159         }
 160     } else if ( state != SND_PCM_STATE_RUNNING ) {
 161         FIXME("Unhandled state: %d\n", state);
 162     }
 163 }
 164
 165 /**
 166  * Allocate the memory-mapped buffer for direct sound, and set up the
 167  * callback.
 168  */
 169 static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
 170 {
 171     snd_pcm_t *pcm = pdbi->pcm;
 172     snd_pcm_format_t format;
 173     snd_pcm_uframes_t frames, ofs, avail, psize, boundary;
 174     unsigned int channels, bits_per_sample, bits_per_frame;
 175     int err, mmap_mode;
 176     const snd_pcm_channel_area_t *areas;
 177     snd_pcm_hw_params_t *hw_params = pdbi->hw_params;
 178     snd_pcm_sw_params_t *sw_params = pdbi->sw_params;
 179
 180     mmap_mode = snd_pcm_type(pcm);
 181
 182     if (mmap_mode == SND_PCM_TYPE_HW)
 183         TRACE("mmap'd buffer is a direct hardware buffer.\n");
 184     else if (mmap_mode == SND_PCM_TYPE_DMIX)
 185         TRACE("mmap'd buffer is an ALSA dmix buffer\n");
 186     else
 187         TRACE("mmap'd buffer is an ALSA type %d buffer\n", mmap_mode);
 188
 189     err = snd_pcm_hw_params_get_period_size(hw_params, &psize, NULL);
 190
 191     err = snd_pcm_hw_params_get_format(hw_params, &format);
 192     err = snd_pcm_hw_params_get_buffer_size(hw_params, &frames);
 193     err = snd_pcm_hw_params_get_channels(hw_params, &channels);
 194     bits_per_sample = snd_pcm_format_physical_width(format);
 195     bits_per_frame = bits_per_sample * channels;
 196
 197     if (TRACE_ON(dsalsa))
 198         ALSA_TraceParameters(hw_params, NULL, FALSE);
 199
 200     TRACE("format=%s  frames=%ld  channels=%d  bits_per_sample=%d  bits_per_frame=%d\n",
 201           snd_pcm_format_name(format), frames, channels, bits_per_sample, bits_per_frame);
 202
 203     pdbi->mmap_buflen_frames = frames;
 204     pdbi->mmap_buflen_bytes = snd_pcm_frames_to_bytes( pcm, frames );
 205
 206     snd_pcm_sw_params_current(pcm, sw_params);
 207     snd_pcm_sw_params_set_start_threshold(pcm, sw_params, 0);
 208     snd_pcm_sw_params_get_boundary(sw_params, &boundary);
 209     snd_pcm_sw_params_set_stop_threshold(pcm, sw_params, boundary);
 210     snd_pcm_sw_params_set_silence_threshold(pcm, sw_params, boundary);
 211     snd_pcm_sw_params_set_silence_size(pcm, sw_params, 0);
 212     snd_pcm_sw_params_set_avail_min(pcm, sw_params, 0);
 213     err = snd_pcm_sw_params(pcm, sw_params);
 214
 215     avail = snd_pcm_avail_update(pcm);
 216     if ((snd_pcm_sframes_t)avail < 0)
 217     {
 218         ERR("No buffer is available: %s.\n", snd_strerror(avail));
 219         return DSERR_GENERIC;
 220     }
 221     err = snd_pcm_mmap_begin(pcm, &areas, &ofs, &avail);
 222     if ( err < 0 )
 223     {
 224         ERR("Can't map sound device for direct access: %s\n", snd_strerror(err));
 225         return DSERR_GENERIC;
 226     }
 227     snd_pcm_format_set_silence(format, areas->addr, pdbi->mmap_buflen_frames);
 228     pdbi->mmap_pos = ofs + snd_pcm_mmap_commit(pcm, ofs, 0);
 229     pdbi->mmap_buffer = areas->addr;
 230
 231     TRACE("created mmap buffer of %ld frames (%d bytes) at %p\n",
 232         frames, pdbi->mmap_buflen_bytes, pdbi->mmap_buffer);
 233
 234     return DS_OK;
 235 }
 236
 237 static HRESULT WINAPI IDsDriverBufferImpl_QueryInterface(PIDSDRIVERBUFFER iface, REFIID riid, LPVOID *ppobj)
 238 {
 239     /* IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface; */
 240     FIXME("(): stub!\n");
 241     return DSERR_UNSUPPORTED;
 242 }
 243
 244 static ULONG WINAPI IDsDriverBufferImpl_AddRef(PIDSDRIVERBUFFER iface)
 245 {
 246     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 247     ULONG refCount = InterlockedIncrement(&This->ref);
 248
 249     TRACE("(%p)->(ref before=%u)\n",This, refCount - 1);
 250
 251     return refCount;
 252 }
 253
 254 static ULONG WINAPI IDsDriverBufferImpl_Release(PIDSDRIVERBUFFER iface)
 255 {
 256     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 257     ULONG refCount = InterlockedDecrement(&This->ref);
 258
 259     TRACE("(%p)->(ref before=%u)\n",This, refCount + 1);
 260
 261     if (refCount)
 262         return refCount;
 263
 264     TRACE("mmap buffer %p destroyed\n", This->mmap_buffer);
 265
 266     if (This == This->drv->primary)
 267         This->drv->primary = NULL;
 268
 269     This->pcm_crst.DebugInfo->Spare[0] = 0;
 270     DeleteCriticalSection(&This->pcm_crst);
 271
 272     snd_pcm_drop(This->pcm);
 273     snd_pcm_close(This->pcm);
 274     This->pcm = NULL;
 275     HeapFree(GetProcessHeap(), 0, This->sw_params);
 276     HeapFree(GetProcessHeap(), 0, This->hw_params);
 277     HeapFree(GetProcessHeap(), 0, This);
 278     return 0;
 279 }
 280
 281 static HRESULT WINAPI IDsDriverBufferImpl_Lock(PIDSDRIVERBUFFER iface,
 282                                                LPVOID*ppvAudio1,LPDWORD pdwLen1,
 283                                                LPVOID*ppvAudio2,LPDWORD pdwLen2,
 284                                                DWORD dwWritePosition,DWORD dwWriteLen,
 285                                                DWORD dwFlags)
 286 {
 287     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 288     snd_pcm_uframes_t writepos;
 289
 290     TRACE("%d bytes from %d\n", dwWriteLen, dwWritePosition);
 291
 292     /* **** */
 293     EnterCriticalSection(&This->pcm_crst);
 294
 295     if (dwFlags & DSBLOCK_ENTIREBUFFER)
 296         dwWriteLen = This->mmap_buflen_bytes;
 297
 298     if (dwWriteLen > This->mmap_buflen_bytes || dwWritePosition >= This->mmap_buflen_bytes)
 299     {
 300         /* **** */
 301         LeaveCriticalSection(&This->pcm_crst);
 302         return DSERR_INVALIDPARAM;
 303     }
 304
 305     if (ppvAudio2) *ppvAudio2 = NULL;
 306     if (pdwLen2) *pdwLen2 = 0;
 307
 308     *ppvAudio1 = (LPBYTE)This->mmap_buffer + dwWritePosition;
 309     *pdwLen1 = dwWriteLen;
 310
 311     if (dwWritePosition+dwWriteLen > This->mmap_buflen_bytes)
 312     {
 313         DWORD remainder = This->mmap_buflen_bytes - dwWritePosition;
 314         *pdwLen1 = remainder;
 315
 316         if (ppvAudio2 && pdwLen2)
 317         {
 318             *ppvAudio2 = This->mmap_buffer;
 319             *pdwLen2 = dwWriteLen - remainder;
 320         }
 321         else dwWriteLen = remainder;
 322     }
 323
 324     writepos = snd_pcm_bytes_to_frames(This->pcm, dwWritePosition);
 325     if (writepos == This->mmap_pos)
 326     {
 327         const snd_pcm_channel_area_t *areas;
 328         snd_pcm_uframes_t writelen = snd_pcm_bytes_to_frames(This->pcm, dwWriteLen), putin = writelen;
 329         TRACE("Hit mmap_pos, locking data!\n");
 330         snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &putin);
 331     }
 332     else
 333         WARN("mmap_pos (%lu) != writepos (%lu) not locking data!\n", This->mmap_pos, writepos);
 334
 335     LeaveCriticalSection(&This->pcm_crst);
 336     /* **** */
 337     return DS_OK;
 338 }
 339
 340 static HRESULT WINAPI IDsDriverBufferImpl_Unlock(PIDSDRIVERBUFFER iface,
 341                                                  LPVOID pvAudio1,DWORD dwLen1,
 342                                                  LPVOID pvAudio2,DWORD dwLen2)
 343 {
 344     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 345     snd_pcm_uframes_t writepos;
 346
 347     if (!dwLen1)
 348         return DS_OK;
 349
 350     /* **** */
 351     EnterCriticalSection(&This->pcm_crst);
 352
 353     writepos = snd_pcm_bytes_to_frames(This->pcm, (DWORD_PTR)pvAudio1 - (DWORD_PTR)This->mmap_buffer);
 354     if (writepos == This->mmap_pos)
 355     {
 356         const snd_pcm_channel_area_t *areas;
 357         snd_pcm_uframes_t writelen = snd_pcm_bytes_to_frames(This->pcm, dwLen1);
 358         TRACE("Committing data\n");
 359         This->mmap_pos += snd_pcm_mmap_commit(This->pcm, This->mmap_pos, writelen);
 360         if (This->mmap_pos == This->mmap_buflen_frames)
 361             This->mmap_pos = 0;
 362         if (!This->mmap_pos && dwLen2)
 363         {
 364             writelen = snd_pcm_bytes_to_frames(This->pcm, dwLen2);
 365             snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &writelen);
 366             This->mmap_pos += snd_pcm_mmap_commit(This->pcm, This->mmap_pos, writelen);
 367             assert(This->mmap_pos < This->mmap_buflen_frames);
 368         }
 369     }
 370     LeaveCriticalSection(&This->pcm_crst);
 371     /* **** */
 372
 373     return DS_OK;
 374 }
 375
 376 static HRESULT SetFormat(IDsDriverBufferImpl *This, LPWAVEFORMATEX pwfx)
 377 {
 378     snd_pcm_t *pcm = NULL;
 379     snd_pcm_hw_params_t *hw_params = This->hw_params;
 380     unsigned int buffer_time = 500000;
 381     snd_pcm_format_t format = -1;
 382     snd_pcm_uframes_t psize;
 383     DWORD rate = pwfx->nSamplesPerSec;
 384     int err=0;
 385
 386     switch (pwfx->wBitsPerSample)
 387     {
 388         case  8: format = SND_PCM_FORMAT_U8; break;
 389         case 16: format = SND_PCM_FORMAT_S16_LE; break;
 390         case 24: format = SND_PCM_FORMAT_S24_3LE; break;
 391         case 32: format = SND_PCM_FORMAT_S32_LE; break;
 392         default: FIXME("Unsupported bpp: %d\n", pwfx->wBitsPerSample); return DSERR_GENERIC;
 393     }
 394
 395     err = snd_pcm_open(&pcm, WOutDev[This->drv->wDevID].pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 396     if (err < 0)
 397     {
 398         if (errno != EBUSY || !This->pcm)
 399         {
 400             WARN("Cannot open sound device: %s\n", snd_strerror(err));
 401             return DSERR_GENERIC;
 402         }
 403         snd_pcm_drop(This->pcm);
 404         snd_pcm_close(This->pcm);
 405         This->pcm = NULL;
 406         err = snd_pcm_open(&pcm, WOutDev[This->drv->wDevID].pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 407         if (err < 0)
 408         {
 409             WARN("Cannot open sound device: %s\n", snd_strerror(err));
 410             return DSERR_BUFFERLOST;
 411         }
 412     }
 413
 414     /* Set some defaults */
 415     snd_pcm_hw_params_any(pcm, hw_params);
 416     err = snd_pcm_hw_params_set_channels(pcm, hw_params, pwfx->nChannels);
 417     if (err < 0) { WARN("Could not set channels to %d\n", pwfx->nChannels); goto err; }
 418
 419     err = snd_pcm_hw_params_set_format(pcm, hw_params, format);
 420     if (err < 0) { WARN("Could not set format to %d bpp\n", pwfx->wBitsPerSample); goto err; }
 421
 422     /* Alsa's rate resampling is only used if the application specifically requests
 423      * a buffer at a certain frequency, else it is better to disable it due to unwanted
 424      * side effects, which may include: Less granular pointer, changing buffer sizes, etc
 425      */
 426 #if SND_LIB_VERSION >= 0x010009
 427     snd_pcm_hw_params_set_rate_resample(pcm, hw_params, 0);
 428 #endif
 429
 430     err = snd_pcm_hw_params_set_rate_near(pcm, hw_params, &rate, NULL);
 431     if (err < 0) { rate = pwfx->nSamplesPerSec; WARN("Could not set rate\n"); goto err; }
 432
 433     if (!ALSA_NearMatch(rate, pwfx->nSamplesPerSec))
 434     {
 435         WARN("Could not set sound rate to %d, but instead to %d\n", pwfx->nSamplesPerSec, rate);
 436         pwfx->nSamplesPerSec = rate;
 437         pwfx->nAvgBytesPerSec = rate * pwfx->nBlockAlign;
 438         /* Let DirectSound detect this */
 439     }
 440
 441     snd_pcm_hw_params_set_periods_integer(pcm, hw_params);
 442     snd_pcm_hw_params_set_buffer_time_near(pcm, hw_params, &buffer_time, NULL);
 443     buffer_time = 10000;
 444     snd_pcm_hw_params_set_period_time_near(pcm, hw_params, &buffer_time, NULL);
 445     err = snd_pcm_hw_params(pcm, hw_params);
 446     err = snd_pcm_sw_params(pcm, This->sw_params);
 447     snd_pcm_prepare(pcm);
 448
 449     err = snd_pcm_hw_params_get_period_size(hw_params, &psize, NULL);
 450     TRACE("Period size is: %lu\n", psize);
 451
 452     /* ALSA needs at least 3 buffers to work successfully */
 453     This->mmap_commitahead = 3 * psize;
 454     while (This->mmap_commitahead <= 512)
 455         This->mmap_commitahead += psize;
 456
 457     if (This->pcm)
 458     {
 459         snd_pcm_drop(This->pcm);
 460         snd_pcm_close(This->pcm);
 461     }
 462     This->pcm = pcm;
 463     snd_pcm_prepare(This->pcm);
 464     DSDB_CreateMMAP(This);
 465     return S_OK;
 466
 467     err:
 468     if (err < 0)
 469         WARN("Failed to apply changes: %s\n", snd_strerror(err));
 470
 471     if (!This->pcm)
 472         This->pcm = pcm;
 473     else
 474         snd_pcm_close(pcm);
 475
 476     if (This->pcm)
 477         snd_pcm_hw_params_current(This->pcm, This->hw_params);
 478
 479     return DSERR_BADFORMAT;
 480 }
 481
 482 static HRESULT WINAPI IDsDriverBufferImpl_SetFormat(PIDSDRIVERBUFFER iface, LPWAVEFORMATEX pwfx)
 483 {
 484     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 485     HRESULT hr = S_OK;
 486
 487     TRACE("(%p, %p)\n", iface, pwfx);
 488
 489     /* **** */
 490     EnterCriticalSection(&This->pcm_crst);
 491     hr = SetFormat(This, pwfx);
 492     /* **** */
 493     LeaveCriticalSection(&This->pcm_crst);
 494
 495     if (hr == DS_OK)
 496         return S_FALSE;
 497     return hr;
 498 }
 499
 500 static HRESULT WINAPI IDsDriverBufferImpl_SetFrequency(PIDSDRIVERBUFFER iface, DWORD dwFreq)
 501 {
 502     /* IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface; */
 503     FIXME("(%p,%d): stub\n",iface,dwFreq);
 504     return S_OK;
 505 }
 506
 507 static HRESULT WINAPI IDsDriverBufferImpl_SetVolumePan(PIDSDRIVERBUFFER iface, PDSVOLUMEPAN pVolPan)
 508 {
 509     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 510     FIXME("(%p,%p): stub\n",This,pVolPan);
 511     /* TODO: Bring volume control back */
 512     return DS_OK;
 513 }
 514
 515 static HRESULT WINAPI IDsDriverBufferImpl_SetPosition(PIDSDRIVERBUFFER iface, DWORD dwNewPos)
 516 {
 517     /* IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface; */
 518     /* I don't even think alsa allows this */
 519     FIXME("(%p,%d): stub\n",iface,dwNewPos);
 520     return DSERR_UNSUPPORTED;
 521 }
 522
 523 static HRESULT WINAPI IDsDriverBufferImpl_GetPosition(PIDSDRIVERBUFFER iface,
 524                                                       LPDWORD lpdwPlay, LPDWORD lpdwWrite)
 525 {
 526     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 527     snd_pcm_uframes_t hw_pptr, hw_wptr;
 528     snd_pcm_state_t state;
 529
 530     /* **** */
 531     EnterCriticalSection(&This->pcm_crst);
 532
 533     if (!This->pcm)
 534     {
 535         FIXME("Bad pointer for pcm: %p\n", This->pcm);
 536         LeaveCriticalSection(&This->pcm_crst);
 537         return DSERR_GENERIC;
 538     }
 539
 540     if (!lpdwPlay && !lpdwWrite)
 541         CommitAll(This);
 542
 543     state = snd_pcm_state(This->pcm);
 544
 545     if (state != SND_PCM_STATE_PREPARED && state != SND_PCM_STATE_RUNNING)
 546     {
 547         CheckXRUN(This);
 548         state = snd_pcm_state(This->pcm);
 549     }
 550     if (state == SND_PCM_STATE_RUNNING)
 551     {
 552         snd_pcm_sframes_t used = This->mmap_buflen_frames - snd_pcm_avail_update(This->pcm);
 553
 554         if (used < 0)
 555         {
 556             This->mmap_pos += -used;
 557             snd_pcm_forward(This->pcm, -used);
 558             This->mmap_pos %= This->mmap_buflen_frames;
 559             used = 0;
 560         }
 561
 562         if (This->mmap_pos > used)
 563             hw_pptr = This->mmap_pos - used;
 564         else
 565             hw_pptr = This->mmap_buflen_frames + This->mmap_pos - used;
 566         hw_pptr %= This->mmap_buflen_frames;
 567
 568         TRACE("At position: %ld (%ld) - Used %ld\n", hw_pptr, This->mmap_pos, used);
 569     }
 570     else hw_pptr = This->mmap_pos;
 571     hw_wptr = This->mmap_pos;
 572
 573     LeaveCriticalSection(&This->pcm_crst);
 574     /* **** */
 575
 576     if (lpdwPlay)
 577         *lpdwPlay = snd_pcm_frames_to_bytes(This->pcm, hw_pptr);
 578     if (lpdwWrite)
 579         *lpdwWrite = snd_pcm_frames_to_bytes(This->pcm, hw_wptr);
 580
 581     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);
 582     return DS_OK;
 583 }
 584
 585 static HRESULT WINAPI IDsDriverBufferImpl_Play(PIDSDRIVERBUFFER iface, DWORD dwRes1, DWORD dwRes2, DWORD dwFlags)
 586 {
 587     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 588     TRACE("(%p,%x,%x,%x)\n",iface,dwRes1,dwRes2,dwFlags);
 589
 590     /* **** */
 591     EnterCriticalSection(&This->pcm_crst);
 592     snd_pcm_start(This->pcm);
 593     /* **** */
 594     LeaveCriticalSection(&This->pcm_crst);
 595     return DS_OK;
 596 }
 597
 598 static HRESULT WINAPI IDsDriverBufferImpl_Stop(PIDSDRIVERBUFFER iface)
 599 {
 600     const snd_pcm_channel_area_t *areas;
 601     snd_pcm_uframes_t avail;
 602     snd_pcm_format_t format;
 603     IDsDriverBufferImpl *This = (IDsDriverBufferImpl *)iface;
 604     TRACE("(%p)\n",iface);
 605
 606     /* **** */
 607     EnterCriticalSection(&This->pcm_crst);
 608     avail = This->mmap_buflen_frames;
 609     snd_pcm_drop(This->pcm);
 610     snd_pcm_prepare(This->pcm);
 611     avail = snd_pcm_avail_update(This->pcm);
 612     snd_pcm_mmap_begin(This->pcm, &areas, &This->mmap_pos, &avail);
 613     snd_pcm_hw_params_get_format(This->hw_params, &format);
 614     snd_pcm_format_set_silence(format, areas->addr, This->mmap_buflen_frames);
 615     snd_pcm_mmap_commit(This->pcm, This->mmap_pos, 0);
 616
 617     /* **** */
 618     LeaveCriticalSection(&This->pcm_crst);
 619     return DS_OK;
 620 }
 621
 622 static const IDsDriverBufferVtbl dsdbvt =
 623 {
 624     IDsDriverBufferImpl_QueryInterface,
 625     IDsDriverBufferImpl_AddRef,
 626     IDsDriverBufferImpl_Release,
 627     IDsDriverBufferImpl_Lock,
 628     IDsDriverBufferImpl_Unlock,
 629     IDsDriverBufferImpl_SetFormat,
 630     IDsDriverBufferImpl_SetFrequency,
 631     IDsDriverBufferImpl_SetVolumePan,
 632     IDsDriverBufferImpl_SetPosition,
 633     IDsDriverBufferImpl_GetPosition,
 634     IDsDriverBufferImpl_Play,
 635     IDsDriverBufferImpl_Stop
 636 };
 637
 638 static HRESULT WINAPI IDsDriverImpl_QueryInterface(PIDSDRIVER iface, REFIID riid, LPVOID *ppobj)
 639 {
 640     /* IDsDriverImpl *This = (IDsDriverImpl *)iface; */
 641     FIXME("(%p): stub!\n",iface);
 642     return DSERR_UNSUPPORTED;
 643 }
 644
 645 static ULONG WINAPI IDsDriverImpl_AddRef(PIDSDRIVER iface)
 646 {
 647     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 648     ULONG refCount = InterlockedIncrement(&This->ref);
 649
 650     TRACE("(%p)->(ref before=%u)\n",This, refCount - 1);
 651
 652     return refCount;
 653 }
 654
 655 static ULONG WINAPI IDsDriverImpl_Release(PIDSDRIVER iface)
 656 {
 657     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 658     ULONG refCount = InterlockedDecrement(&This->ref);
 659
 660     TRACE("(%p)->(ref before=%u)\n",This, refCount + 1);
 661
 662     if (refCount)
 663         return refCount;
 664
 665     HeapFree(GetProcessHeap(), 0, This);
 666     return 0;
 667 }
 668
 669 static HRESULT WINAPI IDsDriverImpl_GetDriverDesc(PIDSDRIVER iface, PDSDRIVERDESC pDesc)
 670 {
 671     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 672     TRACE("(%p,%p)\n",iface,pDesc);
 673     *pDesc                      = WOutDev[This->wDevID].ds_desc;
 674     pDesc->dwFlags              = DSDDESC_DONTNEEDSECONDARYLOCK | DSDDESC_DONTNEEDWRITELEAD;
 675     pDesc->dnDevNode            = WOutDev[This->wDevID].waveDesc.dnDevNode;
 676     pDesc->wVxdId               = 0;
 677     pDesc->wReserved            = 0;
 678     pDesc->ulDeviceNum          = This->wDevID;
 679     pDesc->dwHeapType           = DSDHEAP_NOHEAP;
 680     pDesc->pvDirectDrawHeap     = NULL;
 681     pDesc->dwMemStartAddress    = 0xDEAD0000;
 682     pDesc->dwMemEndAddress      = 0xDEAF0000;
 683     pDesc->dwMemAllocExtra      = 0;
 684     pDesc->pvReserved1          = NULL;
 685     pDesc->pvReserved2          = NULL;
 686     return DS_OK;
 687 }
 688
 689 static HRESULT WINAPI IDsDriverImpl_Open(PIDSDRIVER iface)
 690 {
 691     HRESULT hr = S_OK;
 692     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 693     int err=0;
 694     snd_pcm_t *pcm = NULL;
 695     snd_pcm_hw_params_t *hw_params;
 696
 697     /* While this is not really needed, it is a good idea to do this,
 698      * to see if sound can be initialized */
 699
 700     hw_params = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_hw_params_sizeof());
 701
 702     if (!hw_params)
 703     {
 704         hr = DSERR_OUTOFMEMORY;
 705         goto unalloc;
 706     }
 707
 708     err = snd_pcm_open(&pcm, WOutDev[This->wDevID].pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 709     if (err < 0) goto err;
 710     err = snd_pcm_hw_params_any(pcm, hw_params);
 711     if (err < 0) goto err;
 712     err = snd_pcm_hw_params_set_access (pcm, hw_params, SND_PCM_ACCESS_MMAP_INTERLEAVED);
 713     if (err < 0) goto err;
 714
 715     TRACE("Success\n");
 716     snd_pcm_close(pcm);
 717     goto unalloc;
 718
 719     err:
 720     hr = DSERR_GENERIC;
 721     FIXME("Failed to open device: %s\n", snd_strerror(err));
 722     if (pcm)
 723         snd_pcm_close(pcm);
 724     unalloc:
 725     HeapFree(GetProcessHeap(), 0, hw_params);
 726     if (hr != S_OK)
 727         WARN("--> %08x\n", hr);
 728     return hr;
 729 }
 730
 731 static HRESULT WINAPI IDsDriverImpl_Close(PIDSDRIVER iface)
 732 {
 733     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 734     TRACE("(%p) stub, harmless\n",This);
 735     return DS_OK;
 736 }
 737
 738 static HRESULT WINAPI IDsDriverImpl_GetCaps(PIDSDRIVER iface, PDSDRIVERCAPS pCaps)
 739 {
 740     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 741     TRACE("(%p,%p)\n",iface,pCaps);
 742     *pCaps = WOutDev[This->wDevID].ds_caps;
 743     return DS_OK;
 744 }
 745
 746 static HRESULT WINAPI IDsDriverImpl_CreateSoundBuffer(PIDSDRIVER iface,
 747                                                       LPWAVEFORMATEX pwfx,
 748                                                       DWORD dwFlags, DWORD dwCardAddress,
 749                                                       LPDWORD pdwcbBufferSize,
 750                                                       LPBYTE *ppbBuffer,
 751                                                       LPVOID *ppvObj)
 752 {
 753     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 754     IDsDriverBufferImpl** ippdsdb = (IDsDriverBufferImpl**)ppvObj;
 755     HRESULT err;
 756
 757     TRACE("(%p,%p,%x,%x)\n",iface,pwfx,dwFlags,dwCardAddress);
 758     /* we only support primary buffers... for now */
 759     if (!(dwFlags & DSBCAPS_PRIMARYBUFFER))
 760         return DSERR_UNSUPPORTED;
 761     if (This->primary)
 762         return DSERR_ALLOCATED;
 763
 764     *ippdsdb = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDsDriverBufferImpl));
 765     if (*ippdsdb == NULL)
 766         return DSERR_OUTOFMEMORY;
 767
 768     (*ippdsdb)->hw_params = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_hw_params_sizeof());
 769     (*ippdsdb)->sw_params = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, snd_pcm_sw_params_sizeof());
 770     if (!(*ippdsdb)->hw_params || !(*ippdsdb)->sw_params)
 771     {
 772         HeapFree(GetProcessHeap(), 0, (*ippdsdb)->sw_params);
 773         HeapFree(GetProcessHeap(), 0, (*ippdsdb)->hw_params);
 774         return DSERR_OUTOFMEMORY;
 775     }
 776     (*ippdsdb)->lpVtbl  = &dsdbvt;
 777     (*ippdsdb)->ref     = 1;
 778     (*ippdsdb)->drv     = This;
 779     InitializeCriticalSection(&(*ippdsdb)->pcm_crst);
 780     (*ippdsdb)->pcm_crst.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": ALSA_DSOUTPUT.pcm_crst");
 781
 782     /* SetFormat has to re-initialize pcm here anyway */
 783     err = SetFormat(*ippdsdb, pwfx);
 784     if (FAILED(err))
 785     {
 786         WARN("Error occurred: %08x\n", err);
 787         goto err;
 788     }
 789
 790     if (dwFlags & DSBCAPS_PRIMARYBUFFER)
 791         This->primary = *ippdsdb;
 792
 793     *pdwcbBufferSize = (*ippdsdb)->mmap_buflen_bytes;
 794     *ppbBuffer = (*ippdsdb)->mmap_buffer;
 795
 796     /* buffer is ready to go */
 797     TRACE("buffer created at %p\n", *ippdsdb);
 798     return err;
 799
 800     err:
 801     HeapFree(GetProcessHeap(), 0, (*ippdsdb)->sw_params);
 802     HeapFree(GetProcessHeap(), 0, (*ippdsdb)->hw_params);
 803     HeapFree(GetProcessHeap(), 0, *ippdsdb);
 804     *ippdsdb = NULL;
 805     return err;
 806 }
 807
 808 static HRESULT WINAPI IDsDriverImpl_DuplicateSoundBuffer(PIDSDRIVER iface,
 809                                                          PIDSDRIVERBUFFER pBuffer,
 810                                                          LPVOID *ppvObj)
 811 {
 812     IDsDriverImpl *This = (IDsDriverImpl *)iface;
 813     FIXME("(%p,%p): stub\n",This,pBuffer);
 814     return DSERR_INVALIDCALL;
 815 }
 816
 817 static const IDsDriverVtbl dsdvt =
 818 {
 819     IDsDriverImpl_QueryInterface,
 820     IDsDriverImpl_AddRef,
 821     IDsDriverImpl_Release,
 822     IDsDriverImpl_GetDriverDesc,
 823     IDsDriverImpl_Open,
 824     IDsDriverImpl_Close,
 825     IDsDriverImpl_GetCaps,
 826     IDsDriverImpl_CreateSoundBuffer,
 827     IDsDriverImpl_DuplicateSoundBuffer
 828 };
 829
 830 DWORD wodDsCreate(UINT wDevID, PIDSDRIVER* drv)
 831 {
 832     IDsDriverImpl** idrv = (IDsDriverImpl**)drv;
 833
 834     TRACE("driver created\n");
 835
 836     /* the HAL isn't much better than the HEL if we can't do mmap() */
 837     if (!(WOutDev[wDevID].outcaps.dwSupport & WAVECAPS_DIRECTSOUND))
 838     {
 839         WARN("MMAP not supported for this device, falling back to waveout, should be harmless\n");
 840         return MMSYSERR_NOTSUPPORTED;
 841     }
 842
 843     *idrv = HeapAlloc(GetProcessHeap(),0,sizeof(IDsDriverImpl));
 844     if (!*idrv)
 845         return MMSYSERR_NOMEM;
 846     (*idrv)->lpVtbl     = &dsdvt;
 847     (*idrv)->ref        = 1;
 848
 849     (*idrv)->wDevID     = wDevID;
 850     (*idrv)->primary    = NULL;
 851     return MMSYSERR_NOERROR;
 852 }
 853
 854 DWORD wodDsDesc(UINT wDevID, PDSDRIVERDESC desc)
 855 {
 856     *desc = WOutDev[wDevID].ds_desc;
 857     return MMSYSERR_NOERROR;
 858 }
 859
 860 #endif /* HAVE_ALSA */