dlls/avifil32/acmstream.c

   1 /*
   2  * Copyright 2002 Michael Günnewig
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #define COM_NO_WINDOWS_H
  20 #include <assert.h>
  21
  22 #include "winbase.h"
  23 #include "winuser.h"
  24 #include "winnls.h"
  25 #include "winerror.h"
  26 #include "windowsx.h"
  27 #include "mmsystem.h"
  28 #include "vfw.h"
  29 #include "msacm.h"
  30
  31 #include "avifile_private.h"
  32
  33 #include "wine/debug.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(avifile);
  36
  37 /***********************************************************************/
  38
  39 static HRESULT WINAPI ACMStream_fnQueryInterface(IAVIStream*iface,REFIID refiid,LPVOID *obj);
  40 static ULONG   WINAPI ACMStream_fnAddRef(IAVIStream*iface);
  41 static ULONG   WINAPI ACMStream_fnRelease(IAVIStream* iface);
  42 static HRESULT WINAPI ACMStream_fnCreate(IAVIStream*iface,LPARAM lParam1,LPARAM lParam2);
  43 static HRESULT WINAPI ACMStream_fnInfo(IAVIStream*iface,AVISTREAMINFOW *psi,LONG size);
  44 static LONG    WINAPI ACMStream_fnFindSample(IAVIStream*iface,LONG pos,LONG flags);
  45 static HRESULT WINAPI ACMStream_fnReadFormat(IAVIStream*iface,LONG pos,LPVOID format,LONG *formatsize);
  46 static HRESULT WINAPI ACMStream_fnSetFormat(IAVIStream*iface,LONG pos,LPVOID format,LONG formatsize);
  47 static HRESULT WINAPI ACMStream_fnRead(IAVIStream*iface,LONG start,LONG samples,LPVOID buffer,LONG buffersize,LONG *bytesread,LONG *samplesread);
  48 static HRESULT WINAPI ACMStream_fnWrite(IAVIStream*iface,LONG start,LONG samples,LPVOID buffer,LONG buffersize,DWORD flags,LONG *sampwritten,LONG *byteswritten);
  49 static HRESULT WINAPI ACMStream_fnDelete(IAVIStream*iface,LONG start,LONG samples);
  50 static HRESULT WINAPI ACMStream_fnReadData(IAVIStream*iface,DWORD fcc,LPVOID lp,LONG *lpread);
  51 static HRESULT WINAPI ACMStream_fnWriteData(IAVIStream*iface,DWORD fcc,LPVOID lp,LONG size);
  52 static HRESULT WINAPI ACMStream_fnSetInfo(IAVIStream*iface,AVISTREAMINFOW*info,LONG infolen);
  53
  54 struct ICOM_VTABLE(IAVIStream) iacmst = {
  55   ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
  56   ACMStream_fnQueryInterface,
  57   ACMStream_fnAddRef,
  58   ACMStream_fnRelease,
  59   ACMStream_fnCreate,
  60   ACMStream_fnInfo,
  61   ACMStream_fnFindSample,
  62   ACMStream_fnReadFormat,
  63   ACMStream_fnSetFormat,
  64   ACMStream_fnRead,
  65   ACMStream_fnWrite,
  66   ACMStream_fnDelete,
  67   ACMStream_fnReadData,
  68   ACMStream_fnWriteData,
  69   ACMStream_fnSetInfo
  70 };
  71
  72 typedef struct _IAVIStreamImpl {
  73   /* IUnknown stuff */
  74   ICOM_VFIELD(IAVIStream);
  75   DWORD           ref;
  76
  77   /* IAVIStream stuff */
  78   PAVISTREAM      pStream;
  79   AVISTREAMINFOW  sInfo;
  80
  81   HACMSTREAM      has;
  82
  83   LPWAVEFORMATEX  lpInFormat;
  84   LONG            cbInFormat;
  85
  86   LPWAVEFORMATEX  lpOutFormat;
  87   LONG            cbOutFormat;
  88
  89   ACMSTREAMHEADER acmStreamHdr;
  90 } IAVIStreamImpl;
  91
  92 /***********************************************************************/
  93
  94 #define CONVERT_STREAM_to_THIS(a) { \
  95            acmStreamSize(This->has,(a)*This->lpInFormat->nBlockAlign,\
  96                          &(a), ACM_STREAMSIZEF_SOURCE); \
  97            (a) /= This->lpOutFormat->nBlockAlign; }
  98 #define CONVERT_THIS_to_STREAM(a) { \
  99            acmStreamSize(This->has,(a)*This->lpOutFormat->nBlockAlign,\
 100                          &(a), ACM_STREAMSIZEF_DESTINATION); \
 101            (a) /= This->lpInFormat->nBlockAlign; }
 102
 103 static HRESULT AVIFILE_OpenCompressor(IAVIStreamImpl *This);
 104
 105 HRESULT AVIFILE_CreateACMStream(REFIID riid, LPVOID *ppv)
 106 {
 107   IAVIStreamImpl *pstream;
 108   HRESULT         hr;
 109
 110   assert(riid != NULL && ppv != NULL);
 111
 112   *ppv = NULL;
 113
 114   pstream = (IAVIStreamImpl*)LocalAlloc(LPTR, sizeof(IAVIStreamImpl));
 115   if (pstream == NULL)
 116     return AVIERR_MEMORY;
 117
 118   pstream->lpVtbl = &iacmst;
 119
 120   hr = IUnknown_QueryInterface((IUnknown*)pstream, riid, ppv);
 121   if (FAILED(hr))
 122     LocalFree((HLOCAL)pstream);
 123
 124   return hr;
 125 }
 126
 127 static HRESULT WINAPI ACMStream_fnQueryInterface(IAVIStream *iface,
 128                                                   REFIID refiid, LPVOID *obj)
 129 {
 130   ICOM_THIS(IAVIStreamImpl,iface);
 131
 132   TRACE("(%p,%s,%p)\n", iface, debugstr_guid(refiid), obj);
 133
 134   if (IsEqualGUID(&IID_IUnknown, refiid) ||
 135       IsEqualGUID(&IID_IAVIStream, refiid)) {
 136     *obj = This;
 137     IAVIStream_AddRef(iface);
 138
 139     return S_OK;
 140   }
 141
 142   return OLE_E_ENUM_NOMORE;
 143 }
 144
 145 static ULONG WINAPI ACMStream_fnAddRef(IAVIStream *iface)
 146 {
 147   ICOM_THIS(IAVIStreamImpl,iface);
 148
 149   TRACE("(%p) -> %ld\n", iface, This->ref + 1);
 150
 151   /* also add reference to the nested stream */
 152   if (This->pStream != NULL)
 153     IAVIStream_AddRef(This->pStream);
 154
 155   return ++(This->ref);
 156 }
 157
 158 static ULONG WINAPI ACMStream_fnRelease(IAVIStream* iface)
 159 {
 160   ICOM_THIS(IAVIStreamImpl,iface);
 161
 162   TRACE("(%p) -> %ld\n", iface, This->ref - 1);
 163
 164   if (This->ref == 0) {
 165     /* destruct */
 166     if (This->has != NULL) {
 167       if (This->acmStreamHdr.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED)
 168         acmStreamUnprepareHeader(This->has, &This->acmStreamHdr, 0);
 169       acmStreamClose(This->has, 0);
 170       This->has = NULL;
 171     }
 172     if (This->acmStreamHdr.pbSrc != NULL) {
 173       GlobalFreePtr(This->acmStreamHdr.pbSrc);
 174       This->acmStreamHdr.pbSrc = NULL;
 175     }
 176     if (This->acmStreamHdr.pbDst != NULL) {
 177       GlobalFreePtr(This->acmStreamHdr.pbDst);
 178       This->acmStreamHdr.pbDst = NULL;
 179     }
 180     if (This->lpInFormat != NULL) {
 181       GlobalFreePtr(This->lpInFormat);
 182       This->lpInFormat = NULL;
 183       This->cbInFormat = 0;
 184     }
 185     if (This->lpOutFormat != NULL) {
 186       GlobalFreePtr(This->lpOutFormat);
 187       This->lpOutFormat = NULL;
 188       This->cbOutFormat = 0;
 189     }
 190     if (This->pStream != NULL) {
 191       IAVIStream_Release(This->pStream);
 192       This->pStream = NULL;
 193     }
 194     LocalFree((HLOCAL)This);
 195
 196     return 0;
 197   }
 198
 199   /* also release reference to the nested stream */
 200   if (This->pStream != NULL)
 201     IAVIStream_Release(This->pStream);
 202
 203   return --This->ref;
 204 }
 205
 206 /* lParam1: PAVISTREAM
 207  * lParam2: LPAVICOMPRESSOPTIONS -- even if doc's say LPWAVEFORMAT
 208  */
 209 static HRESULT WINAPI ACMStream_fnCreate(IAVIStream *iface, LPARAM lParam1,
 210                                           LPARAM lParam2)
 211 {
 212   ICOM_THIS(IAVIStreamImpl,iface);
 213
 214   TRACE("(%p,0x%08lX,0x%08lX)\n", iface, lParam1, lParam2);
 215
 216   /* check for swapped parameters */
 217   if ((LPVOID)lParam1 != NULL &&
 218       ((LPAVICOMPRESSOPTIONS)lParam1)->fccType == streamtypeAUDIO) {
 219     register LPARAM tmp = lParam1;
 220
 221     lParam1 = lParam2;
 222     lParam2 = tmp;
 223   }
 224
 225   if ((LPVOID)lParam1 == NULL)
 226     return AVIERR_BADPARAM;
 227
 228   IAVIStream_Info((PAVISTREAM)lParam1, &This->sInfo, sizeof(This->sInfo));
 229   if (This->sInfo.fccType != streamtypeAUDIO)
 230     return AVIERR_ERROR; /* error in registry or AVIMakeCompressedStream */
 231
 232   This->sInfo.fccHandler = 0; /* be paranoid */
 233
 234   /* FIXME: check ACM version? Which version does we need? */
 235
 236   if ((LPVOID)lParam2 != NULL) {
 237     /* We only need the format from the compress-options */
 238     if (((LPAVICOMPRESSOPTIONS)lParam2)->fccType == streamtypeAUDIO)
 239       lParam2 = (LPARAM)((LPAVICOMPRESSOPTIONS)lParam2)->lpFormat;
 240
 241     if (((LPWAVEFORMATEX)lParam2)->wFormatTag != WAVE_FORMAT_PCM)
 242       This->cbOutFormat = sizeof(WAVEFORMATEX) + ((LPWAVEFORMATEX)lParam2)->cbSize;
 243     else
 244       This->cbOutFormat = sizeof(PCMWAVEFORMAT);
 245
 246     This->lpOutFormat = (LPWAVEFORMATEX)GlobalAllocPtr(GHND, This->cbOutFormat);
 247     if (This->lpOutFormat == NULL)
 248       return AVIERR_MEMORY;
 249
 250     memcpy(This->lpOutFormat, (LPVOID)lParam2, This->cbOutFormat);
 251   } else {
 252     This->lpOutFormat = NULL;
 253     This->cbOutFormat = 0;
 254   }
 255
 256   This->pStream = (PAVISTREAM)lParam1;
 257   IAVIStream_AddRef(This->pStream);
 258
 259   return AVIERR_OK;
 260 }
 261
 262 static HRESULT WINAPI ACMStream_fnInfo(IAVIStream *iface,LPAVISTREAMINFOW psi,
 263                                         LONG size)
 264 {
 265   ICOM_THIS(IAVIStreamImpl,iface);
 266
 267   TRACE("(%p,%p,%ld)\n", iface, psi, size);
 268
 269   if (psi == NULL)
 270     return AVIERR_BADPARAM;
 271   if (size < 0)
 272     return AVIERR_BADSIZE;
 273
 274   /* Need codec to correct some values in structure */
 275   if (This->has == NULL) {
 276     HRESULT hr = AVIFILE_OpenCompressor(This);
 277
 278     if (FAILED(hr))
 279       return hr;
 280   }
 281
 282   memcpy(psi, &This->sInfo, min(size, (LONG)sizeof(This->sInfo)));
 283
 284   if (size < (LONG)sizeof(This->sInfo))
 285     return AVIERR_BUFFERTOOSMALL;
 286   return AVIERR_OK;
 287 }
 288
 289 static LONG WINAPI ACMStream_fnFindSample(IAVIStream *iface, LONG pos,
 290                                            LONG flags)
 291 {
 292   ICOM_THIS(IAVIStreamImpl,iface);
 293
 294   TRACE("(%p,%ld,0x%08lX)\n",iface,pos,flags);
 295
 296   if (flags & FIND_FROM_START) {
 297     pos = This->sInfo.dwStart;
 298     flags &= ~(FIND_FROM_START|FIND_PREV);
 299     flags |= FIND_NEXT;
 300   }
 301
 302   /* convert pos from our 'space' to This->pStream's one */
 303   CONVERT_THIS_to_STREAM(pos);
 304
 305   /* ask stream */
 306   pos = IAVIStream_FindSample(This->pStream, pos, flags);
 307
 308   if (pos != -1) {
 309     /* convert pos back to our 'space' if it's no size or physical pos */
 310     if ((flags & FIND_RET) == 0)
 311       CONVERT_STREAM_to_THIS(pos);
 312   }
 313
 314   return pos;
 315 }
 316
 317 static HRESULT WINAPI ACMStream_fnReadFormat(IAVIStream *iface, LONG pos,
 318                                               LPVOID format, LONG *formatsize)
 319 {
 320   ICOM_THIS(IAVIStreamImpl,iface);
 321
 322   TRACE("(%p,%ld,%p,%p)\n", iface, pos, format, formatsize);
 323
 324   if (formatsize == NULL)
 325     return AVIERR_BADPARAM;
 326
 327   if (This->has == NULL) {
 328     HRESULT hr = AVIFILE_OpenCompressor(This);
 329
 330     if (FAILED(hr))
 331       return hr;
 332   }
 333
 334   /* only interested in needed buffersize? */
 335   if (format == NULL || *formatsize <= 0) {
 336     *formatsize = This->cbOutFormat;
 337
 338     return AVIERR_OK;
 339   }
 340
 341   /* copy initial format (only as much as will fit) */
 342   memcpy(format, This->lpOutFormat, min(*formatsize, This->cbOutFormat));
 343   if (*formatsize < This->cbOutFormat) {
 344     *formatsize = This->cbOutFormat;
 345     return AVIERR_BUFFERTOOSMALL;
 346   }
 347
 348   *formatsize = This->cbOutFormat;
 349   return AVIERR_OK;
 350 }
 351
 352 static HRESULT WINAPI ACMStream_fnSetFormat(IAVIStream *iface, LONG pos,
 353                                              LPVOID format, LONG formatsize)
 354 {
 355   ICOM_THIS(IAVIStreamImpl,iface);
 356
 357   HRESULT hr;
 358
 359   TRACE("(%p,%ld,%p,%ld)\n", iface, pos, format, formatsize);
 360
 361   /* check parameters */
 362   if (format == NULL || formatsize <= 0)
 363     return AVIERR_BADPARAM;
 364
 365   /* Input format already known?
 366    * Changing is unsupported, but be quiet if it's the same */
 367   if (This->lpInFormat != NULL) {
 368     if (This->cbInFormat != formatsize ||
 369         memcmp(format, This->lpInFormat, formatsize) != 0)
 370       return AVIERR_UNSUPPORTED;
 371
 372     return AVIERR_OK;
 373   }
 374
 375   /* Does the nested stream support writing? */
 376   if ((This->sInfo.dwCaps & AVIFILECAPS_CANWRITE) == 0)
 377     return AVIERR_READONLY;
 378
 379   This->lpInFormat = (LPWAVEFORMATEX)GlobalAllocPtr(GMEM_MOVEABLE, formatsize);
 380   if (This->lpInFormat == NULL)
 381     return AVIERR_MEMORY;
 382   This->cbInFormat = formatsize;
 383   memcpy(This->lpInFormat, format, formatsize);
 384
 385   /* initialize formats and get compressor */
 386   hr = AVIFILE_OpenCompressor(This);
 387   if (FAILED(hr))
 388     return hr;
 389
 390   CONVERT_THIS_to_STREAM(pos);
 391
 392   /* tell the nested stream the new format */
 393   return IAVIStream_SetFormat(This->pStream, pos, This->lpOutFormat,
 394                               This->cbOutFormat);
 395 }
 396
 397 static HRESULT WINAPI ACMStream_fnRead(IAVIStream *iface, LONG start,
 398                                         LONG samples, LPVOID buffer,
 399                                         LONG buffersize, LPLONG bytesread,
 400                                         LPLONG samplesread)
 401 {
 402   ICOM_THIS(IAVIStreamImpl,iface);
 403
 404   HRESULT hr;
 405   DWORD   size;
 406
 407   TRACE("(%p,%ld,%ld,%p,%ld,%p,%p)\n", iface, start, samples, buffer,
 408         buffersize, bytesread, samplesread);
 409
 410   /* clear return parameters if given */
 411   if (bytesread != NULL)
 412     *bytesread = 0;
 413   if (samplesread != NULL)
 414     *samplesread = 0;
 415
 416   /* Do we have our compressor? */
 417   if (This->has == NULL) {
 418     hr = AVIFILE_OpenCompressor(This);
 419
 420     if (FAILED(hr))
 421       return hr;
 422   }
 423
 424   /* only need to pass through? */
 425   if (This->cbInFormat == This->cbOutFormat &&
 426       memcmp(This->lpInFormat, This->lpOutFormat, This->cbInFormat) == 0) {
 427     return IAVIStream_Read(This->pStream, start, samples, buffer, buffersize,
 428                            bytesread, samplesread);
 429   }
 430
 431   /* read as much as fit? */
 432   if (samples == -1)
 433     samples = buffersize / This->lpOutFormat->nBlockAlign;
 434   /* limit to buffersize */
 435   if (samples * This->lpOutFormat->nBlockAlign > buffersize)
 436     samples = buffersize / This->lpOutFormat->nBlockAlign;
 437
 438   /* only return needed size? */
 439   if (buffer == NULL || buffersize <= 0 || samples == 0) {
 440     if (bytesread == NULL && samplesread == NULL)
 441       return AVIERR_BADPARAM;
 442
 443     if (bytesread != NULL)
 444       *bytesread = samples * This->lpOutFormat->nBlockAlign;
 445     if (samplesread != NULL)
 446       *samplesread = samples;
 447
 448     return AVIERR_OK;
 449   }
 450
 451   /* map our positions to pStream positions */
 452   CONVERT_THIS_to_STREAM(start);
 453
 454   /* our needed internal buffersize */
 455   size = samples * This->lpInFormat->nBlockAlign;
 456
 457   /* Need to free destination buffer used for writing? */
 458   if (This->acmStreamHdr.pbDst != NULL) {
 459     GlobalFreePtr(This->acmStreamHdr.pbDst);
 460     This->acmStreamHdr.pbDst     = NULL;
 461     This->acmStreamHdr.dwDstUser = 0;
 462   }
 463
 464   /* need bigger source buffer? */
 465   if (This->acmStreamHdr.pbSrc == NULL ||
 466       This->acmStreamHdr.dwSrcUser < size) {
 467     This->acmStreamHdr.pbSrc = GlobalReAllocPtr(This->acmStreamHdr.pbSrc,
 468                                                 size, GMEM_MOVEABLE);
 469     if (This->acmStreamHdr.pbSrc == NULL)
 470       return AVIERR_MEMORY;
 471     This->acmStreamHdr.dwSrcUser = size;
 472   }
 473
 474   This->acmStreamHdr.cbStruct = sizeof(This->acmStreamHdr);
 475   This->acmStreamHdr.cbSrcLengthUsed = 0;
 476   This->acmStreamHdr.cbDstLengthUsed = 0;
 477   This->acmStreamHdr.cbSrcLength     = size;
 478
 479   /* read source data */
 480   hr = IAVIStream_Read(This->pStream, start, -1, This->acmStreamHdr.pbSrc,
 481                        This->acmStreamHdr.cbSrcLength,
 482                        &This->acmStreamHdr.cbSrcLength, NULL);
 483   if (FAILED(hr) || This->acmStreamHdr.cbSrcLength == 0)
 484     return hr;
 485
 486   /* need to prepare stream? */
 487   This->acmStreamHdr.pbDst       = buffer;
 488   This->acmStreamHdr.cbDstLength = buffersize;
 489   if ((This->acmStreamHdr.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED) == 0) {
 490     if (acmStreamPrepareHeader(This->has, &This->acmStreamHdr, 0) != S_OK) {
 491       This->acmStreamHdr.pbDst       = NULL;
 492       This->acmStreamHdr.cbDstLength = 0;
 493       return AVIERR_COMPRESSOR;
 494     }
 495   }
 496
 497   /* now do the conversion */
 498   /* FIXME: use ACM_CONVERTF_* flags */
 499   if (acmStreamConvert(This->has, &This->acmStreamHdr, 0) != S_OK)
 500     hr = AVIERR_COMPRESSOR;
 501
 502   This->acmStreamHdr.pbDst       = NULL;
 503   This->acmStreamHdr.cbDstLength = 0;
 504
 505   /* fill out return parameters if given */
 506   if (bytesread != NULL)
 507     *bytesread = This->acmStreamHdr.cbDstLengthUsed;
 508   if (samplesread != NULL)
 509     *samplesread =
 510       This->acmStreamHdr.cbDstLengthUsed / This->lpOutFormat->nBlockAlign;
 511
 512   return hr;
 513 }
 514
 515 static HRESULT WINAPI ACMStream_fnWrite(IAVIStream *iface, LONG start,
 516                                          LONG samples, LPVOID buffer,
 517                                          LONG buffersize, DWORD flags,
 518                                          LPLONG sampwritten,
 519                                          LPLONG byteswritten)
 520 {
 521   ICOM_THIS(IAVIStreamImpl,iface);
 522
 523   HRESULT hr;
 524   LONG    size;
 525
 526   TRACE("(%p,%ld,%ld,%p,%ld,0x%08lX,%p,%p)\n", iface, start, samples,
 527         buffer, buffersize, flags, sampwritten, byteswritten);
 528
 529   /* clear return parameters if given */
 530   if (sampwritten != NULL)
 531     *sampwritten = 0;
 532   if (byteswritten != NULL)
 533     *byteswritten = 0;
 534
 535   /* check parameters */
 536   if (buffer == NULL && (buffersize > 0 || samples > 0))
 537     return AVIERR_BADPARAM;
 538
 539   /* Have we write capability? */
 540   if ((This->sInfo.dwCaps & AVIFILECAPS_CANWRITE) == 0)
 541     return AVIERR_READONLY;
 542
 543   /* also need a compressor */
 544   if (This->has == NULL)
 545     return AVIERR_NOCOMPRESSOR;
 546
 547   /* map our sizes to pStream sizes */
 548   size = buffersize;
 549   CONVERT_THIS_to_STREAM(size);
 550   CONVERT_THIS_to_STREAM(start);
 551
 552   /* no bytes to write? -- short circuit */
 553   if (size == 0) {
 554     return IAVIStream_Write(This->pStream, -1, samples, buffer, size,
 555                             flags, sampwritten, byteswritten);
 556   }
 557
 558   /* Need to free source buffer used for reading? */
 559   if (This->acmStreamHdr.pbSrc != NULL) {
 560     GlobalFreePtr(This->acmStreamHdr.pbSrc);
 561     This->acmStreamHdr.pbSrc     = NULL;
 562     This->acmStreamHdr.dwSrcUser = 0;
 563   }
 564
 565   /* Need bigger destination buffer? */
 566   if (This->acmStreamHdr.pbDst == NULL ||
 567       This->acmStreamHdr.dwDstUser < size) {
 568     This->acmStreamHdr.pbDst = GlobalReAllocPtr(This->acmStreamHdr.pbDst,
 569                                                 size, GMEM_MOVEABLE);
 570     if (This->acmStreamHdr.pbDst == NULL)
 571       return AVIERR_MEMORY;
 572     This->acmStreamHdr.dwDstUser = size;
 573   }
 574   This->acmStreamHdr.cbStruct        = sizeof(This->acmStreamHdr);
 575   This->acmStreamHdr.cbSrcLengthUsed = 0;
 576   This->acmStreamHdr.cbDstLengthUsed = 0;
 577   This->acmStreamHdr.cbDstLength     = This->acmStreamHdr.dwDstUser;
 578
 579   /* need to prepare stream? */
 580   This->acmStreamHdr.pbSrc       = buffer;
 581   This->acmStreamHdr.cbSrcLength = buffersize;
 582   if ((This->acmStreamHdr.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED) == 0) {
 583     if (acmStreamPrepareHeader(This->has, &This->acmStreamHdr, 0) != S_OK) {
 584       This->acmStreamHdr.pbSrc       = NULL;
 585       This->acmStreamHdr.cbSrcLength = 0;
 586       return AVIERR_COMPRESSOR;
 587     }
 588   }
 589
 590   /* now do the conversion */
 591   /* FIXME: use ACM_CONVERTF_* flags */
 592   if (acmStreamConvert(This->has, &This->acmStreamHdr, 0) != S_OK)
 593     hr = AVIERR_COMPRESSOR;
 594   else
 595     hr = AVIERR_OK;
 596
 597   This->acmStreamHdr.pbSrc       = NULL;
 598   This->acmStreamHdr.cbSrcLength = 0;
 599
 600   if (FAILED(hr))
 601     return hr;
 602
 603   return IAVIStream_Write(This->pStream,-1,This->acmStreamHdr.cbDstLengthUsed /
 604                           This->lpOutFormat->nBlockAlign,This->acmStreamHdr.pbDst,
 605                           This->acmStreamHdr.cbDstLengthUsed,flags,sampwritten,
 606                           byteswritten);
 607 }
 608
 609 static HRESULT WINAPI ACMStream_fnDelete(IAVIStream *iface, LONG start,
 610                                           LONG samples)
 611 {
 612   ICOM_THIS(IAVIStreamImpl,iface);
 613
 614   TRACE("(%p,%ld,%ld)\n", iface, start, samples);
 615
 616   /* check parameters */
 617   if (start < 0 || samples < 0)
 618     return AVIERR_BADPARAM;
 619
 620   /* Delete before start of stream? */
 621   if ((DWORD)(start + samples) < This->sInfo.dwStart)
 622     return AVIERR_OK;
 623
 624   /* Delete after end of stream? */
 625   if ((DWORD)start > This->sInfo.dwLength)
 626     return AVIERR_OK;
 627
 628   /* For the rest we need write capability */
 629   if ((This->sInfo.dwCaps & AVIFILECAPS_CANWRITE) == 0)
 630     return AVIERR_READONLY;
 631
 632   /* A compressor is also necessary */
 633   if (This->has == NULL)
 634     return AVIERR_NOCOMPRESSOR;
 635
 636   /* map our positions to pStream positions */
 637   CONVERT_THIS_to_STREAM(start);
 638   CONVERT_THIS_to_STREAM(samples);
 639
 640   return IAVIStream_Delete(This->pStream, start, samples);
 641 }
 642
 643 static HRESULT WINAPI ACMStream_fnReadData(IAVIStream *iface, DWORD fcc,
 644                                             LPVOID lp, LPLONG lpread)
 645 {
 646   ICOM_THIS(IAVIStreamImpl,iface);
 647
 648   TRACE("(%p,0x%08lX,%p,%p)\n", iface, fcc, lp, lpread);
 649
 650   assert(This->pStream != NULL);
 651
 652   return IAVIStream_ReadData(This->pStream, fcc, lp, lpread);
 653 }
 654
 655 static HRESULT WINAPI ACMStream_fnWriteData(IAVIStream *iface, DWORD fcc,
 656                                              LPVOID lp, LONG size)
 657 {
 658   ICOM_THIS(IAVIStreamImpl,iface);
 659
 660   TRACE("(%p,0x%08lx,%p,%ld)\n", iface, fcc, lp, size);
 661
 662   assert(This->pStream != NULL);
 663
 664   return IAVIStream_WriteData(This->pStream, fcc, lp, size);
 665 }
 666
 667 static HRESULT WINAPI ACMStream_fnSetInfo(IAVIStream *iface,
 668                                            LPAVISTREAMINFOW info, LONG infolen)
 669 {
 670   FIXME("(%p,%p,%ld): stub\n", iface, info, infolen);
 671
 672   return E_FAIL;
 673 }
 674
 675 /***********************************************************************/
 676
 677 static HRESULT AVIFILE_OpenCompressor(IAVIStreamImpl *This)
 678 {
 679   HRESULT hr;
 680
 681   /* pre-conditions */
 682   assert(This != NULL);
 683   assert(This->pStream != NULL);
 684
 685   if (This->has != NULL)
 686     return AVIERR_OK;
 687
 688   if (This->lpInFormat == NULL) {
 689     /* decode or encode the data from pStream */
 690     hr = AVIStreamFormatSize(This->pStream, This->sInfo.dwStart, &This->cbInFormat);
 691     if (FAILED(hr))
 692       return hr;
 693     This->lpInFormat = (LPWAVEFORMATEX)GlobalAllocPtr(GMEM_MOVEABLE, This->cbInFormat);
 694     if (This->lpInFormat == NULL)
 695       return AVIERR_MEMORY;
 696
 697     hr = IAVIStream_ReadFormat(This->pStream, This->sInfo.dwStart,
 698                                This->lpInFormat, &This->cbInFormat);
 699     if (FAILED(hr))
 700       return hr;
 701
 702     if (This->lpOutFormat == NULL) {
 703       /* we must decode to default format */
 704       This->cbOutFormat = sizeof(PCMWAVEFORMAT);
 705       This->lpOutFormat = (LPWAVEFORMATEX)GlobalAllocPtr(GHND, This->cbOutFormat);
 706       if (This->lpOutFormat == NULL)
 707         return AVIERR_MEMORY;
 708
 709       This->lpOutFormat->wFormatTag = WAVE_FORMAT_PCM;
 710       if (acmFormatSuggest(NULL, This->lpInFormat, This->lpOutFormat,
 711                            This->cbOutFormat, ACM_FORMATSUGGESTF_WFORMATTAG) != S_OK)
 712         return AVIERR_NOCOMPRESSOR;
 713     }
 714   } else if (This->lpOutFormat == NULL)
 715     return AVIERR_ERROR; /* To what should I encode? */
 716
 717   if (acmStreamOpen(&This->has, NULL, This->lpInFormat, This->lpOutFormat,
 718                     NULL, 0, 0, ACM_STREAMOPENF_NONREALTIME) != S_OK)
 719     return AVIERR_NOCOMPRESSOR;
 720
 721   /* update AVISTREAMINFO structure */
 722   This->sInfo.dwSampleSize = This->lpOutFormat->nBlockAlign;
 723   This->sInfo.dwScale      = This->lpOutFormat->nBlockAlign;
 724   This->sInfo.dwRate       = This->lpOutFormat->nAvgBytesPerSec;
 725   This->sInfo.dwQuality    = (DWORD)ICQUALITY_DEFAULT;
 726   SetRectEmpty(&This->sInfo.rcFrame);
 727
 728   /* convert positions ansd sizes to output format */
 729   CONVERT_STREAM_to_THIS(This->sInfo.dwStart);
 730   CONVERT_STREAM_to_THIS(This->sInfo.dwLength);
 731   CONVERT_STREAM_to_THIS(This->sInfo.dwSuggestedBufferSize);
 732
 733   return AVIERR_OK;
 734 }