git.oblomov.eu Git - wine/blob - dlls/quartz/control.c

   1 /*
   2  * Filter Seeking and Control Interfaces
   3  *
   4  * Copyright 2003 Robert Shearman
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20 /* FIXME: critical sections */
  21
  22 #include "quartz_private.h"
  23 #include "control_private.h"
  24
  25 #include "uuids.h"
  26 #include "wine/debug.h"
  27
  28 #include <assert.h>
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
  31
  32 static const IMediaSeekingVtbl IMediaSeekingPassThru_Vtbl;
  33
  34 typedef struct PassThruImpl {
  35     const ISeekingPassThruVtbl *IPassThru_vtbl;
  36     const IUnknownVtbl *IInner_vtbl;
  37     const IMediaSeekingVtbl *IMediaSeeking_vtbl;
  38
  39     LONG ref;
  40     IUnknown * pUnkOuter;
  41     IPin * pin;
  42     BOOL bUnkOuterValid;
  43     BOOL bAggregatable;
  44     BOOL renderer;
  45     CRITICAL_SECTION time_cs;
  46     BOOL timevalid;
  47     REFERENCE_TIME time_earliest;
  48 } PassThruImpl;
  49
  50 static HRESULT WINAPI SeekInner_QueryInterface(IUnknown * iface,
  51                                           REFIID riid,
  52                                           LPVOID *ppvObj) {
  53     ICOM_THIS_MULTI(PassThruImpl, IInner_vtbl, iface);
  54     TRACE("(%p)->(%s (%p), %p)\n", This, debugstr_guid(riid), riid, ppvObj);
  55
  56     if (This->bAggregatable)
  57         This->bUnkOuterValid = TRUE;
  58
  59     if (IsEqualGUID(&IID_IUnknown, riid))
  60     {
  61         *ppvObj = &(This->IInner_vtbl);
  62         TRACE("   returning IUnknown interface (%p)\n", *ppvObj);
  63     } else if (IsEqualGUID(&IID_ISeekingPassThru, riid)) {
  64         *ppvObj = &(This->IPassThru_vtbl);
  65         TRACE("   returning ISeekingPassThru interface (%p)\n", *ppvObj);
  66     } else if (IsEqualGUID(&IID_IMediaSeeking, riid)) {
  67         *ppvObj = &(This->IMediaSeeking_vtbl);
  68         TRACE("   returning IMediaSeeking interface (%p)\n", *ppvObj);
  69     } else {
  70         *ppvObj = NULL;
  71         FIXME("unknown interface %s\n", debugstr_guid(riid));
  72         return E_NOINTERFACE;
  73     }
  74
  75     IUnknown_AddRef((IUnknown *)(*ppvObj));
  76     return S_OK;
  77 }
  78
  79 static ULONG WINAPI SeekInner_AddRef(IUnknown * iface) {
  80     ICOM_THIS_MULTI(PassThruImpl, IInner_vtbl, iface);
  81     ULONG ref = InterlockedIncrement(&This->ref);
  82
  83     TRACE("(%p)->(): new ref = %d\n", This, ref);
  84
  85     return ref;
  86 }
  87
  88 static ULONG WINAPI SeekInner_Release(IUnknown * iface) {
  89     ICOM_THIS_MULTI(PassThruImpl, IInner_vtbl, iface);
  90     ULONG ref = InterlockedDecrement(&This->ref);
  91
  92     TRACE("(%p)->(): new ref = %d\n", This, ref);
  93
  94     if (ref == 0)
  95     {
  96         This->time_cs.DebugInfo->Spare[0] = 0;
  97         DeleteCriticalSection(&This->time_cs);
  98         CoTaskMemFree(This);
  99     }
 100     return ref;
 101 }
 102
 103 static const IUnknownVtbl IInner_VTable =
 104 {
 105     SeekInner_QueryInterface,
 106     SeekInner_AddRef,
 107     SeekInner_Release
 108 };
 109
 110 /* Generic functions for aggregation */
 111 static HRESULT SeekOuter_QueryInterface(PassThruImpl *This, REFIID riid, LPVOID *ppv)
 112 {
 113     if (This->bAggregatable)
 114         This->bUnkOuterValid = TRUE;
 115
 116     if (This->pUnkOuter)
 117     {
 118         if (This->bAggregatable)
 119             return IUnknown_QueryInterface(This->pUnkOuter, riid, ppv);
 120
 121         if (IsEqualIID(riid, &IID_IUnknown))
 122         {
 123             HRESULT hr;
 124
 125             IUnknown_AddRef((IUnknown *)&(This->IInner_vtbl));
 126             hr = IUnknown_QueryInterface((IUnknown *)&(This->IInner_vtbl), riid, ppv);
 127             IUnknown_Release((IUnknown *)&(This->IInner_vtbl));
 128             This->bAggregatable = TRUE;
 129             return hr;
 130         }
 131
 132         *ppv = NULL;
 133         return E_NOINTERFACE;
 134     }
 135
 136     return IUnknown_QueryInterface((IUnknown *)&(This->IInner_vtbl), riid, ppv);
 137 }
 138
 139 static ULONG SeekOuter_AddRef(PassThruImpl *This)
 140 {
 141     if (This->pUnkOuter && This->bUnkOuterValid)
 142         return IUnknown_AddRef(This->pUnkOuter);
 143     return IUnknown_AddRef((IUnknown *)&(This->IInner_vtbl));
 144 }
 145
 146 static ULONG SeekOuter_Release(PassThruImpl *This)
 147 {
 148     if (This->pUnkOuter && This->bUnkOuterValid)
 149         return IUnknown_Release(This->pUnkOuter);
 150     return IUnknown_Release((IUnknown *)&(This->IInner_vtbl));
 151 }
 152
 153 static HRESULT WINAPI SeekingPassThru_QueryInterface(ISeekingPassThru *iface, REFIID riid, LPVOID *ppvObj)
 154 {
 155     ICOM_THIS_MULTI(PassThruImpl, IPassThru_vtbl, iface);
 156
 157     TRACE("(%p/%p)->(%s (%p), %p)\n", This, iface, debugstr_guid(riid), riid, ppvObj);
 158
 159     return SeekOuter_QueryInterface(This, riid, ppvObj);
 160 }
 161
 162 static ULONG WINAPI SeekingPassThru_AddRef(ISeekingPassThru *iface)
 163 {
 164     ICOM_THIS_MULTI(PassThruImpl, IPassThru_vtbl, iface);
 165
 166     TRACE("(%p/%p)->()\n", This, iface);
 167
 168     return SeekOuter_AddRef(This);
 169 }
 170
 171 static ULONG WINAPI SeekingPassThru_Release(ISeekingPassThru *iface)
 172 {
 173     ICOM_THIS_MULTI(PassThruImpl, IPassThru_vtbl, iface);
 174
 175     TRACE("(%p/%p)->()\n", This, iface);
 176
 177     return SeekOuter_Release(This);
 178 }
 179
 180 static HRESULT WINAPI SeekingPassThru_Init(ISeekingPassThru *iface, BOOL renderer, IPin *pin)
 181 {
 182     ICOM_THIS_MULTI(PassThruImpl, IPassThru_vtbl, iface);
 183
 184     TRACE("(%p/%p)->(%d, %p)\n", This, iface, renderer, pin);
 185
 186     if (This->pin)
 187         FIXME("Re-initializing?\n");
 188
 189     This->renderer = renderer;
 190     This->pin = pin;
 191
 192     return S_OK;
 193 }
 194
 195 static const ISeekingPassThruVtbl ISeekingPassThru_Vtbl =
 196 {
 197     SeekingPassThru_QueryInterface,
 198     SeekingPassThru_AddRef,
 199     SeekingPassThru_Release,
 200     SeekingPassThru_Init
 201 };
 202
 203 HRESULT SeekingPassThru_create(IUnknown *pUnkOuter, LPVOID *ppObj)
 204 {
 205     PassThruImpl *fimpl;
 206
 207     TRACE("(%p,%p)\n", pUnkOuter, ppObj);
 208
 209     *ppObj = fimpl = CoTaskMemAlloc(sizeof(*fimpl));
 210     if (!fimpl)
 211         return E_OUTOFMEMORY;
 212
 213     fimpl->pUnkOuter = pUnkOuter;
 214     fimpl->bUnkOuterValid = FALSE;
 215     fimpl->bAggregatable = FALSE;
 216     fimpl->IInner_vtbl = &IInner_VTable;
 217     fimpl->IPassThru_vtbl = &ISeekingPassThru_Vtbl;
 218     fimpl->IMediaSeeking_vtbl = &IMediaSeekingPassThru_Vtbl;
 219     fimpl->ref = 1;
 220     fimpl->pin = NULL;
 221     fimpl->timevalid = 0;
 222     InitializeCriticalSection(&fimpl->time_cs);
 223     fimpl->time_cs.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PassThruImpl.time_cs");
 224     return S_OK;
 225 }
 226
 227 static HRESULT WINAPI MediaSeekingPassThru_QueryInterface(IMediaSeeking *iface, REFIID riid, LPVOID *ppvObj)
 228 {
 229     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 230
 231     TRACE("(%p/%p)->(%s (%p), %p)\n", This, iface, debugstr_guid(riid), riid, ppvObj);
 232
 233     return SeekOuter_QueryInterface(This, riid, ppvObj);
 234 }
 235
 236 static ULONG WINAPI MediaSeekingPassThru_AddRef(IMediaSeeking *iface)
 237 {
 238     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 239
 240     TRACE("(%p/%p)->()\n", iface, This);
 241
 242     return SeekOuter_AddRef(This);
 243 }
 244
 245 static ULONG WINAPI MediaSeekingPassThru_Release(IMediaSeeking *iface)
 246 {
 247     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 248
 249     TRACE("(%p/%p)->()\n", iface, This);
 250
 251     return SeekOuter_Release(This);
 252 }
 253
 254 static HRESULT get_connected(PassThruImpl *This, IMediaSeeking **seek) {
 255     HRESULT hr;
 256     IPin *pin;
 257     *seek = NULL;
 258     hr = IPin_ConnectedTo(This->pin, &pin);
 259     if (FAILED(hr))
 260         return VFW_E_NOT_CONNECTED;
 261     hr = IPin_QueryInterface(pin, &IID_IMediaSeeking, (void**)seek);
 262     IPin_Release(pin);
 263     if (FAILED(hr))
 264         hr = E_NOTIMPL;
 265     return hr;
 266 }
 267
 268 static HRESULT WINAPI MediaSeekingPassThru_GetCapabilities(IMediaSeeking * iface, DWORD * pCapabilities)
 269 {
 270     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 271     IMediaSeeking *seek;
 272     HRESULT hr;
 273     TRACE("(%p/%p)->(%p)\n", iface, This, pCapabilities);
 274     hr = get_connected(This, &seek);
 275     if (SUCCEEDED(hr)) {
 276         hr = IMediaSeeking_GetCapabilities(seek, pCapabilities);
 277         IMediaSeeking_Release(seek);
 278     }
 279     else
 280         return E_NOTIMPL;
 281     return hr;
 282 }
 283
 284 static HRESULT WINAPI MediaSeekingPassThru_CheckCapabilities(IMediaSeeking * iface, DWORD * pCapabilities)
 285 {
 286     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 287     IMediaSeeking *seek;
 288     HRESULT hr;
 289     TRACE("(%p/%p)->(%p)\n", iface, This, pCapabilities);
 290     hr = get_connected(This, &seek);
 291     if (SUCCEEDED(hr)) {
 292         hr = IMediaSeeking_CheckCapabilities(seek, pCapabilities);
 293         IMediaSeeking_Release(seek);
 294     }
 295     else
 296         return E_NOTIMPL;
 297     return hr;
 298 }
 299
 300 static HRESULT WINAPI MediaSeekingPassThru_IsFormatSupported(IMediaSeeking * iface, const GUID * pFormat)
 301 {
 302     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 303     IMediaSeeking *seek;
 304     HRESULT hr;
 305     TRACE("(%p/%p)->(%s)\n", iface, This, qzdebugstr_guid(pFormat));
 306     hr = get_connected(This, &seek);
 307     if (SUCCEEDED(hr)) {
 308         hr = IMediaSeeking_IsFormatSupported(seek, pFormat);
 309         IMediaSeeking_Release(seek);
 310     }
 311     else
 312         return E_NOTIMPL;
 313     return hr;
 314 }
 315
 316 static HRESULT WINAPI MediaSeekingPassThru_QueryPreferredFormat(IMediaSeeking * iface, GUID * pFormat)
 317 {
 318     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 319     IMediaSeeking *seek;
 320     HRESULT hr;
 321     TRACE("(%p/%p)->(%p)\n", iface, This, pFormat);
 322     hr = get_connected(This, &seek);
 323     if (SUCCEEDED(hr)) {
 324         hr = IMediaSeeking_QueryPreferredFormat(seek, pFormat);
 325         IMediaSeeking_Release(seek);
 326     }
 327     else
 328         return E_NOTIMPL;
 329     return hr;
 330 }
 331
 332 static HRESULT WINAPI MediaSeekingPassThru_GetTimeFormat(IMediaSeeking * iface, GUID * pFormat)
 333 {
 334     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 335     IMediaSeeking *seek;
 336     HRESULT hr;
 337     TRACE("(%p/%p)->(%p)\n", iface, This, pFormat);
 338     hr = get_connected(This, &seek);
 339     if (SUCCEEDED(hr)) {
 340         hr = IMediaSeeking_GetTimeFormat(seek, pFormat);
 341         IMediaSeeking_Release(seek);
 342     }
 343     else
 344         return E_NOTIMPL;
 345     return hr;
 346 }
 347
 348 static HRESULT WINAPI MediaSeekingPassThru_IsUsingTimeFormat(IMediaSeeking * iface, const GUID * pFormat)
 349 {
 350     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 351     IMediaSeeking *seek;
 352     HRESULT hr;
 353     TRACE("(%p/%p)->(%s)\n", iface, This, qzdebugstr_guid(pFormat));
 354     hr = get_connected(This, &seek);
 355     if (SUCCEEDED(hr)) {
 356         hr = IMediaSeeking_IsUsingTimeFormat(seek, pFormat);
 357         IMediaSeeking_Release(seek);
 358     }
 359     else
 360         return E_NOTIMPL;
 361     return hr;
 362 }
 363
 364 static HRESULT WINAPI MediaSeekingPassThru_SetTimeFormat(IMediaSeeking * iface, const GUID * pFormat)
 365 {
 366     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 367     IMediaSeeking *seek;
 368     HRESULT hr;
 369     TRACE("(%p/%p)->(%s)\n", iface, This, qzdebugstr_guid(pFormat));
 370     hr = get_connected(This, &seek);
 371     if (SUCCEEDED(hr)) {
 372         hr = IMediaSeeking_SetTimeFormat(seek, pFormat);
 373         IMediaSeeking_Release(seek);
 374     }
 375     else
 376         return E_NOTIMPL;
 377     return hr;
 378 }
 379
 380 static HRESULT WINAPI MediaSeekingPassThru_GetDuration(IMediaSeeking * iface, LONGLONG * pDuration)
 381 {
 382     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 383     IMediaSeeking *seek;
 384     HRESULT hr;
 385     TRACE("(%p/%p)->(%p)\n", iface, This, pDuration);
 386     hr = get_connected(This, &seek);
 387     if (SUCCEEDED(hr)) {
 388         hr = IMediaSeeking_GetDuration(seek, pDuration);
 389         IMediaSeeking_Release(seek);
 390     }
 391     else
 392         return E_NOTIMPL;
 393     return hr;
 394 }
 395
 396 static HRESULT WINAPI MediaSeekingPassThru_GetStopPosition(IMediaSeeking * iface, LONGLONG * pStop)
 397 {
 398     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 399     IMediaSeeking *seek;
 400     HRESULT hr;
 401     TRACE("(%p/%p)->(%p)\n", iface, This, pStop);
 402     hr = get_connected(This, &seek);
 403     if (SUCCEEDED(hr)) {
 404         hr = IMediaSeeking_GetStopPosition(seek, pStop);
 405         IMediaSeeking_Release(seek);
 406     }
 407     else
 408         return E_NOTIMPL;
 409     return hr;
 410 }
 411
 412 static HRESULT WINAPI MediaSeekingPassThru_GetCurrentPosition(IMediaSeeking * iface, LONGLONG * pCurrent)
 413 {
 414     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 415     IMediaSeeking *seek;
 416     HRESULT hr = S_OK;
 417     TRACE("(%p/%p)->(%p)\n", iface, This, pCurrent);
 418     if (!pCurrent)
 419         return E_POINTER;
 420     EnterCriticalSection(&This->time_cs);
 421     if (This->timevalid)
 422         *pCurrent = This->time_earliest;
 423     else
 424         hr = E_FAIL;
 425     LeaveCriticalSection(&This->time_cs);
 426     if (SUCCEEDED(hr)) {
 427         hr = IMediaSeeking_ConvertTimeFormat(iface, pCurrent, NULL, *pCurrent, &TIME_FORMAT_MEDIA_TIME);
 428         return hr;
 429     }
 430     hr = get_connected(This, &seek);
 431     if (SUCCEEDED(hr)) {
 432         hr = IMediaSeeking_GetCurrentPosition(seek, pCurrent);
 433         IMediaSeeking_Release(seek);
 434     }
 435     else
 436         return E_NOTIMPL;
 437     return hr;
 438 }
 439
 440 static HRESULT WINAPI MediaSeekingPassThru_ConvertTimeFormat(IMediaSeeking * iface, LONGLONG * pTarget, const GUID * pTargetFormat, LONGLONG Source, const GUID * pSourceFormat)
 441 {
 442     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 443     IMediaSeeking *seek;
 444     HRESULT hr;
 445     TRACE("(%p/%p)->(%p,%s,%x%08x,%s)\n", iface, This, pTarget, debugstr_guid(pTargetFormat), (DWORD)(Source>>32), (DWORD)Source, debugstr_guid(pSourceFormat));
 446     hr = get_connected(This, &seek);
 447     if (SUCCEEDED(hr)) {
 448         hr = IMediaSeeking_ConvertTimeFormat(seek, pTarget, pTargetFormat, Source, pSourceFormat);
 449         IMediaSeeking_Release(seek);
 450     }
 451     else
 452         return E_NOTIMPL;
 453     return hr;
 454 }
 455
 456 static HRESULT WINAPI MediaSeekingPassThru_SetPositions(IMediaSeeking * iface, LONGLONG * pCurrent, DWORD dwCurrentFlags, LONGLONG * pStop, DWORD dwStopFlags)
 457 {
 458     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 459     IMediaSeeking *seek;
 460     HRESULT hr;
 461     TRACE("(%p/%p)->(%p,%x,%p,%x)\n", iface, This, pCurrent, dwCurrentFlags, pStop, dwStopFlags);
 462     hr = get_connected(This, &seek);
 463     if (SUCCEEDED(hr)) {
 464         hr = IMediaSeeking_SetPositions(seek, pCurrent, dwCurrentFlags, pStop, dwStopFlags);
 465         IMediaSeeking_Release(seek);
 466     } else if (hr == VFW_E_NOT_CONNECTED)
 467         hr = S_OK;
 468     return hr;
 469 }
 470
 471 static HRESULT WINAPI MediaSeekingPassThru_GetPositions(IMediaSeeking * iface, LONGLONG * pCurrent, LONGLONG * pStop)
 472 {
 473     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 474     IMediaSeeking *seek;
 475     HRESULT hr;
 476     TRACE("(%p/%p)->(%p, %p)\n", iface, This, pCurrent, pStop);
 477     hr = get_connected(This, &seek);
 478     if (SUCCEEDED(hr)) {
 479         hr = IMediaSeeking_GetPositions(seek, pCurrent, pStop);
 480         IMediaSeeking_Release(seek);
 481     }
 482     else
 483         return E_NOTIMPL;
 484     return hr;
 485 }
 486
 487 static HRESULT WINAPI MediaSeekingPassThru_GetAvailable(IMediaSeeking * iface, LONGLONG * pEarliest, LONGLONG * pLatest)
 488 {
 489     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 490     IMediaSeeking *seek;
 491     HRESULT hr;
 492     TRACE("(%p/%p)->(%p,%p)\n", iface, This, pEarliest, pLatest);
 493     hr = get_connected(This, &seek);
 494     if (SUCCEEDED(hr)) {
 495         hr = IMediaSeeking_GetAvailable(seek, pEarliest, pLatest);
 496         IMediaSeeking_Release(seek);
 497     }
 498     else
 499         return E_NOTIMPL;
 500     return hr;
 501 }
 502
 503 static HRESULT WINAPI MediaSeekingPassThru_SetRate(IMediaSeeking * iface, double dRate)
 504 {
 505     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 506     IMediaSeeking *seek;
 507     HRESULT hr;
 508     TRACE("(%p/%p)->(%e)\n", iface, This, dRate);
 509     hr = get_connected(This, &seek);
 510     if (SUCCEEDED(hr)) {
 511         hr = IMediaSeeking_SetRate(seek, dRate);
 512         IMediaSeeking_Release(seek);
 513     }
 514     else
 515         return E_NOTIMPL;
 516     return hr;
 517 }
 518
 519 static HRESULT WINAPI MediaSeekingPassThru_GetRate(IMediaSeeking * iface, double * dRate)
 520 {
 521     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 522     IMediaSeeking *seek;
 523     HRESULT hr;
 524     TRACE("(%p/%p)->(%p)\n", iface, This, dRate);
 525     hr = get_connected(This, &seek);
 526     if (SUCCEEDED(hr)) {
 527         hr = IMediaSeeking_GetRate(seek, dRate);
 528         IMediaSeeking_Release(seek);
 529     }
 530     else
 531         return E_NOTIMPL;
 532     return hr;
 533 }
 534
 535 static HRESULT WINAPI MediaSeekingPassThru_GetPreroll(IMediaSeeking * iface, LONGLONG * pPreroll)
 536 {
 537     ICOM_THIS_MULTI(PassThruImpl, IMediaSeeking_vtbl, iface);
 538     IMediaSeeking *seek;
 539     HRESULT hr;
 540     TRACE("(%p)\n", pPreroll);
 541     hr = get_connected(This, &seek);
 542     if (SUCCEEDED(hr)) {
 543         hr = IMediaSeeking_GetPreroll(seek, pPreroll);
 544         IMediaSeeking_Release(seek);
 545     }
 546     else
 547         return E_NOTIMPL;
 548     return hr;
 549 }
 550
 551 void MediaSeekingPassThru_RegisterMediaTime(IUnknown *iface, REFERENCE_TIME start) {
 552     ICOM_THIS_MULTI(PassThruImpl, IInner_vtbl, iface);
 553     EnterCriticalSection(&This->time_cs);
 554     This->time_earliest = start;
 555     This->timevalid = 1;
 556     LeaveCriticalSection(&This->time_cs);
 557 }
 558
 559 void MediaSeekingPassThru_ResetMediaTime(IUnknown *iface) {
 560     ICOM_THIS_MULTI(PassThruImpl, IInner_vtbl, iface);
 561     EnterCriticalSection(&This->time_cs);
 562     This->timevalid = 0;
 563     LeaveCriticalSection(&This->time_cs);
 564 }
 565
 566 void MediaSeekingPassThru_EOS(IUnknown *iface) {
 567     ICOM_THIS_MULTI(PassThruImpl, IInner_vtbl, iface);
 568     REFERENCE_TIME time;
 569     HRESULT hr;
 570     hr = IMediaSeeking_GetStopPosition((IMediaSeeking*)&This->IMediaSeeking_vtbl, &time);
 571     EnterCriticalSection(&This->time_cs);
 572     if (SUCCEEDED(hr)) {
 573         This->timevalid = 1;
 574         This->time_earliest = time;
 575     } else
 576         This->timevalid = 0;
 577     LeaveCriticalSection(&This->time_cs);
 578 }
 579
 580 static const IMediaSeekingVtbl IMediaSeekingPassThru_Vtbl =
 581 {
 582     MediaSeekingPassThru_QueryInterface,
 583     MediaSeekingPassThru_AddRef,
 584     MediaSeekingPassThru_Release,
 585     MediaSeekingPassThru_GetCapabilities,
 586     MediaSeekingPassThru_CheckCapabilities,
 587     MediaSeekingPassThru_IsFormatSupported,
 588     MediaSeekingPassThru_QueryPreferredFormat,
 589     MediaSeekingPassThru_GetTimeFormat,
 590     MediaSeekingPassThru_IsUsingTimeFormat,
 591     MediaSeekingPassThru_SetTimeFormat,
 592     MediaSeekingPassThru_GetDuration,
 593     MediaSeekingPassThru_GetStopPosition,
 594     MediaSeekingPassThru_GetCurrentPosition,
 595     MediaSeekingPassThru_ConvertTimeFormat,
 596     MediaSeekingPassThru_SetPositions,
 597     MediaSeekingPassThru_GetPositions,
 598     MediaSeekingPassThru_GetAvailable,
 599     MediaSeekingPassThru_SetRate,
 600     MediaSeekingPassThru_GetRate,
 601     MediaSeekingPassThru_GetPreroll
 602 };