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   1 /*
   2  * MS ADPCM handling
   3  *
   4  *      Copyright (C) 2002              Eric Pouech
   5  *
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <assert.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "winuser.h"
  29 #include "winnls.h"
  30 #include "mmsystem.h"
  31 #include "mmreg.h"
  32 #include "msacm.h"
  33 #include "msacmdrv.h"
  34 #include "wine/debug.h"
  35
  36 /* see http://www.pcisys.net/~melanson/codecs/adpcm.txt for the details */
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(adpcm);
  39
  40 /***********************************************************************
  41  *           ADPCM_drvOpen
  42  */
  43 static LRESULT ADPCM_drvOpen(LPCSTR str)
  44 {
  45     return 1;
  46 }
  47
  48 /***********************************************************************
  49  *           ADPCM_drvClose
  50  */
  51 static LRESULT ADPCM_drvClose(DWORD_PTR dwDevID)
  52 {
  53     return 1;
  54 }
  55
  56 typedef struct tagAcmAdpcmData
  57 {
  58     void (*convert)(PACMDRVSTREAMINSTANCE adsi,
  59                     const unsigned char*, LPDWORD, unsigned char*, LPDWORD);
  60 } AcmAdpcmData;
  61
  62 /* table to list all supported formats... those are the basic ones. this
  63  * also helps given a unique index to each of the supported formats
  64  */
  65 typedef struct
  66 {
  67     int         nChannels;
  68     int         nBits;
  69     int         rate;
  70 } Format;
  71
  72 static Format PCM_Formats[] =
  73 {
  74     {1,  8,  8000}, {2,  8,  8000}, {1, 16,  8000}, {2, 16,  8000},
  75     {1,  8, 11025}, {2,  8, 11025}, {1, 16, 11025}, {2, 16, 11025},
  76     {1,  8, 22050}, {2,  8, 22050}, {1, 16, 22050}, {2, 16, 22050},
  77     {1,  8, 44100}, {2,  8, 44100}, {1, 16, 44100}, {2, 16, 44100},
  78 };
  79
  80 static Format ADPCM_Formats[] =
  81 {
  82     {1,  4,  8000}, {2, 4,  8000},  {1,  4, 11025}, {2,  4, 11025},
  83     {1,  4, 22050}, {2, 4, 22050},  {1,  4, 44100}, {2,  4, 44100},
  84 };
  85
  86 #define NUM_PCM_FORMATS         (sizeof(PCM_Formats) / sizeof(PCM_Formats[0]))
  87 #define NUM_ADPCM_FORMATS       (sizeof(ADPCM_Formats) / sizeof(ADPCM_Formats[0]))
  88
  89 static int MS_Delta[] =
  90 {
  91     230, 230, 230, 230, 307, 409, 512, 614,
  92     768, 614, 512, 409, 307, 230, 230, 230
  93 };
  94
  95
  96 static ADPCMCOEFSET MSADPCM_CoeffSet[] =
  97 {
  98     {256, 0}, {512, -256}, {0, 0}, {192, 64}, {240, 0}, {460, -208}, {392, -232}
  99 };
 100
 101 /***********************************************************************
 102  *           ADPCM_GetFormatIndex
 103  */
 104 static  DWORD   ADPCM_GetFormatIndex(WAVEFORMATEX* wfx)
 105 {
 106     int         i, hi;
 107     Format*     fmts;
 108
 109     switch (wfx->wFormatTag)
 110     {
 111     case WAVE_FORMAT_PCM:
 112         hi = NUM_PCM_FORMATS;
 113         fmts = PCM_Formats;
 114         break;
 115     case WAVE_FORMAT_ADPCM:
 116         hi = NUM_ADPCM_FORMATS;
 117         fmts = ADPCM_Formats;
 118         break;
 119     default:
 120         return 0xFFFFFFFF;
 121     }
 122
 123     for (i = 0; i < hi; i++)
 124     {
 125         if (wfx->nChannels == fmts[i].nChannels &&
 126             wfx->nSamplesPerSec == fmts[i].rate &&
 127             wfx->wBitsPerSample == fmts[i].nBits)
 128             return i;
 129     }
 130
 131     return 0xFFFFFFFF;
 132 }
 133
 134 static void     init_wfx_adpcm(ADPCMWAVEFORMAT* awfx)
 135 {
 136     register WAVEFORMATEX*      pwfx = &awfx->wfx;
 137
 138     /* we assume wFormatTag, nChannels, nSamplesPerSec and wBitsPerSample
 139      * have been initialized... */
 140
 141     if (pwfx->wFormatTag != WAVE_FORMAT_ADPCM) {FIXME("wrong FT\n"); return;}
 142     if (ADPCM_GetFormatIndex(pwfx) == 0xFFFFFFFF) {FIXME("wrong fmt\n"); return;}
 143
 144     switch (pwfx->nSamplesPerSec)
 145     {
 146     case  8000: pwfx->nBlockAlign = 256;   break;
 147     case 11025: pwfx->nBlockAlign = 256;   break;
 148     case 22050: pwfx->nBlockAlign = 512;   break;
 149     default:
 150     case 44100: pwfx->nBlockAlign = 1024;  break;
 151     }
 152     pwfx->cbSize = 2 * sizeof(WORD) + 7 * sizeof(ADPCMCOEFSET);
 153     /* 7 is the size of the block head (which contains two samples) */
 154
 155     awfx->wSamplesPerBlock = (pwfx->nBlockAlign - (7 * pwfx->nChannels)) * (2 / pwfx->nChannels) + 2;
 156     pwfx->nAvgBytesPerSec = (pwfx->nSamplesPerSec * pwfx->nBlockAlign) / awfx->wSamplesPerBlock;
 157     awfx->wNumCoef = 7;
 158     memcpy(awfx->aCoef, MSADPCM_CoeffSet, 7 * sizeof(ADPCMCOEFSET));
 159 }
 160
 161 /***********************************************************************
 162  *           R16
 163  *
 164  * Read a 16 bit sample (correctly handles endianess)
 165  */
 166 static inline short  R16(const unsigned char* src)
 167 {
 168     return (short)((unsigned short)src[0] | ((unsigned short)src[1] << 8));
 169 }
 170
 171 /***********************************************************************
 172  *           W16
 173  *
 174  * Write a 16 bit sample (correctly handles endianess)
 175  */
 176 static inline void  W16(unsigned char* dst, short s)
 177 {
 178     dst[0] = LOBYTE(s);
 179     dst[1] = HIBYTE(s);
 180 }
 181
 182 static inline void clamp_sample(int* sample)
 183 {
 184     if (*sample < -32768) *sample = -32768;
 185     if (*sample >  32767) *sample =  32767;
 186 }
 187
 188 static inline void process_nibble(unsigned nibble, int* idelta,
 189                                   int* sample1, int* sample2,
 190                                   const ADPCMCOEFSET* coeff)
 191 {
 192     int sample;
 193     int snibble;
 194
 195     /* nibble is in fact a signed 4 bit integer => propagate sign if needed */
 196     snibble = (nibble & 0x08) ? (nibble - 16) : nibble;
 197     sample = ((*sample1 * coeff->iCoef1) + (*sample2 * coeff->iCoef2)) / 256 +
 198         snibble * *idelta;
 199     clamp_sample(&sample);
 200
 201     *sample2 = *sample1;
 202     *sample1 = sample;
 203     *idelta = ((MS_Delta[nibble] * *idelta) / 256);
 204     if (*idelta < 16) *idelta = 16;
 205 }
 206
 207 static  void cvtSSms16K(PACMDRVSTREAMINSTANCE adsi,
 208                         const unsigned char* src, LPDWORD nsrc,
 209                         unsigned char* dst, LPDWORD ndst)
 210 {
 211     int                 ideltaL, ideltaR;
 212     int                 sample1L, sample2L;
 213     int                 sample1R, sample2R;
 214     ADPCMCOEFSET        coeffL, coeffR;
 215     int                 nsamp;
 216     int                 nsamp_blk = ((ADPCMWAVEFORMAT*)adsi->pwfxSrc)->wSamplesPerBlock;
 217     DWORD               nblock = min(*nsrc / adsi->pwfxSrc->nBlockAlign,
 218                                      *ndst / (nsamp_blk * 2 * 2));
 219
 220     *nsrc = nblock * adsi->pwfxSrc->nBlockAlign;
 221     *ndst = nblock * nsamp_blk * 2 * 2;
 222
 223     nsamp_blk -= 2; /* see below for samples from block head */
 224     for (; nblock > 0; nblock--)
 225     {
 226         const unsigned char*    in_src = src;
 227
 228         assert(*src <= 6);
 229         coeffL = MSADPCM_CoeffSet[*src++];
 230         assert(*src <= 6);
 231         coeffR = MSADPCM_CoeffSet[*src++];
 232
 233         ideltaL  = R16(src);    src += 2;
 234         ideltaR  = R16(src);    src += 2;
 235         sample1L = R16(src);    src += 2;
 236         sample1R = R16(src);    src += 2;
 237         sample2L = R16(src);    src += 2;
 238         sample2R = R16(src);    src += 2;
 239
 240         /* store samples from block head */
 241         W16(dst, sample2L);      dst += 2;
 242         W16(dst, sample2R);      dst += 2;
 243         W16(dst, sample1L);      dst += 2;
 244         W16(dst, sample1R);      dst += 2;
 245
 246         for (nsamp = nsamp_blk; nsamp > 0; nsamp--)
 247         {
 248             process_nibble(*src >> 4, &ideltaL, &sample1L, &sample2L, &coeffL);
 249             W16(dst, sample1L); dst += 2;
 250             process_nibble(*src++ & 0x0F, &ideltaR, &sample1R, &sample2R, &coeffR);
 251             W16(dst, sample1R); dst += 2;
 252         }
 253         src = in_src + adsi->pwfxSrc->nBlockAlign;
 254     }
 255 }
 256
 257 static  void cvtMMms16K(PACMDRVSTREAMINSTANCE adsi,
 258                         const unsigned char* src, LPDWORD nsrc,
 259                         unsigned char* dst, LPDWORD ndst)
 260 {
 261     int                 idelta;
 262     int                 sample1, sample2;
 263     ADPCMCOEFSET        coeff;
 264     int                 nsamp;
 265     int                 nsamp_blk = ((ADPCMWAVEFORMAT*)adsi->pwfxSrc)->wSamplesPerBlock;
 266     DWORD               nblock = min(*nsrc / adsi->pwfxSrc->nBlockAlign,
 267                                      *ndst / (nsamp_blk * 2));
 268
 269     *nsrc = nblock * adsi->pwfxSrc->nBlockAlign;
 270     *ndst = nblock * nsamp_blk * 2;
 271
 272     nsamp_blk -= 2; /* see below for samples from block head */
 273     for (; nblock > 0; nblock--)
 274     {
 275         const unsigned char*    in_src = src;
 276
 277         assert(*src <= 6);
 278         coeff = MSADPCM_CoeffSet[*src++];
 279
 280         idelta =  R16(src);     src += 2;
 281         sample1 = R16(src);     src += 2;
 282         sample2 = R16(src);     src += 2;
 283
 284         /* store samples from block head */
 285         W16(dst, sample2);      dst += 2;
 286         W16(dst, sample1);      dst += 2;
 287
 288         for (nsamp = nsamp_blk; nsamp > 0; nsamp -= 2)
 289         {
 290             process_nibble(*src >> 4, &idelta, &sample1, &sample2, &coeff);
 291             W16(dst, sample1); dst += 2;
 292             process_nibble(*src++ & 0x0F, &idelta, &sample1, &sample2, &coeff);
 293             W16(dst, sample1); dst += 2;
 294         }
 295         src = in_src + adsi->pwfxSrc->nBlockAlign;
 296     }
 297 }
 298
 299 #if 0
 300 static  void cvtSS16msK(PACMDRVSTREAMINSTANCE adsi,
 301                         const unsigned char* src, LPDWORD nsrc,
 302                         unsigned char* dst, LPDWORD ndst)
 303 {
 304 }
 305
 306 static  void cvtMM16msK(PACMDRVSTREAMINSTANCE adsi,
 307                         const unsigned char* src, LPDWORD nsrc,
 308                         unsigned char* dst, LPDWORD ndst)
 309 {
 310 }
 311 #endif
 312
 313 /***********************************************************************
 314  *           ADPCM_DriverDetails
 315  *
 316  */
 317 static  LRESULT ADPCM_DriverDetails(PACMDRIVERDETAILSW add)
 318 {
 319     add->fccType = ACMDRIVERDETAILS_FCCTYPE_AUDIOCODEC;
 320     add->fccComp = ACMDRIVERDETAILS_FCCCOMP_UNDEFINED;
 321     add->wMid = 0xFF;
 322     add->wPid = 0x00;
 323     add->vdwACM = 0x01000000;
 324     add->vdwDriver = 0x01000000;
 325     add->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
 326     add->cFormatTags = 2; /* PCM, MS ADPCM */
 327     add->cFilterTags = 0;
 328     add->hicon = NULL;
 329     MultiByteToWideChar( CP_ACP, 0, "WINE-MS ADPCM", -1,
 330                          add->szShortName, sizeof(add->szShortName)/sizeof(WCHAR) );
 331     MultiByteToWideChar( CP_ACP, 0, "Wine MS ADPCM converter", -1,
 332                          add->szLongName, sizeof(add->szLongName)/sizeof(WCHAR) );
 333     MultiByteToWideChar( CP_ACP, 0, "Brought to you by the Wine team...", -1,
 334                          add->szCopyright, sizeof(add->szCopyright)/sizeof(WCHAR) );
 335     MultiByteToWideChar( CP_ACP, 0, "Refer to LICENSE file", -1,
 336                          add->szLicensing, sizeof(add->szLicensing)/sizeof(WCHAR) );
 337     add->szFeatures[0] = 0;
 338
 339     return MMSYSERR_NOERROR;
 340 }
 341
 342 /***********************************************************************
 343  *           ADPCM_FormatTagDetails
 344  *
 345  */
 346 static  LRESULT ADPCM_FormatTagDetails(PACMFORMATTAGDETAILSW aftd, DWORD dwQuery)
 347 {
 348     static const WCHAR szPcm[]={'P','C','M',0};
 349     static const WCHAR szMsAdPcm[]={'M','S',' ','A','d','P','C','M',0};
 350
 351     switch (dwQuery)
 352     {
 353     case ACM_FORMATTAGDETAILSF_INDEX:
 354         if (aftd->dwFormatTagIndex >= 2) return ACMERR_NOTPOSSIBLE;
 355         break;
 356     case ACM_FORMATTAGDETAILSF_LARGESTSIZE:
 357         if (aftd->dwFormatTag == WAVE_FORMAT_UNKNOWN)
 358         {
 359             aftd->dwFormatTagIndex = 1; /* WAVE_FORMAT_ADPCM is bigger than PCM */
 360             break;
 361         }
 362         /* fall thru */
 363     case ACM_FORMATTAGDETAILSF_FORMATTAG:
 364         switch (aftd->dwFormatTag)
 365         {
 366         case WAVE_FORMAT_PCM:   aftd->dwFormatTagIndex = 0; break;
 367         case WAVE_FORMAT_ADPCM: aftd->dwFormatTagIndex = 1; break;
 368         default:                return ACMERR_NOTPOSSIBLE;
 369         }
 370         break;
 371     default:
 372         WARN("Unsupported query %08x\n", dwQuery);
 373         return MMSYSERR_NOTSUPPORTED;
 374     }
 375
 376     aftd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
 377     switch (aftd->dwFormatTagIndex)
 378     {
 379     case 0:
 380         aftd->dwFormatTag = WAVE_FORMAT_PCM;
 381         aftd->cbFormatSize = sizeof(PCMWAVEFORMAT);
 382         aftd->cStandardFormats = NUM_PCM_FORMATS;
 383         lstrcpyW(aftd->szFormatTag, szPcm);
 384         break;
 385     case 1:
 386         aftd->dwFormatTag = WAVE_FORMAT_ADPCM;
 387         aftd->cbFormatSize = sizeof(ADPCMWAVEFORMAT) + (7 - 1) * sizeof(ADPCMCOEFSET);
 388         aftd->cStandardFormats = NUM_ADPCM_FORMATS;
 389         lstrcpyW(aftd->szFormatTag, szMsAdPcm);
 390         break;
 391     }
 392     return MMSYSERR_NOERROR;
 393 }
 394
 395 /***********************************************************************
 396  *           ADPCM_FormatDetails
 397  *
 398  */
 399 static  LRESULT ADPCM_FormatDetails(PACMFORMATDETAILSW afd, DWORD dwQuery)
 400 {
 401     switch (dwQuery)
 402     {
 403     case ACM_FORMATDETAILSF_FORMAT:
 404         if (ADPCM_GetFormatIndex(afd->pwfx) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
 405         break;
 406     case ACM_FORMATDETAILSF_INDEX:
 407         afd->pwfx->wFormatTag = afd->dwFormatTag;
 408         switch (afd->dwFormatTag)
 409         {
 410         case WAVE_FORMAT_PCM:
 411             if (afd->dwFormatIndex >= NUM_PCM_FORMATS) return ACMERR_NOTPOSSIBLE;
 412             afd->pwfx->nChannels = PCM_Formats[afd->dwFormatIndex].nChannels;
 413             afd->pwfx->nSamplesPerSec = PCM_Formats[afd->dwFormatIndex].rate;
 414             afd->pwfx->wBitsPerSample = PCM_Formats[afd->dwFormatIndex].nBits;
 415             /* native MSACM uses a PCMWAVEFORMAT structure, so cbSize is not accessible
 416              * afd->pwfx->cbSize = 0;
 417              */
 418             afd->pwfx->nBlockAlign =
 419                 (afd->pwfx->nChannels * afd->pwfx->wBitsPerSample) / 8;
 420             afd->pwfx->nAvgBytesPerSec =
 421                 afd->pwfx->nSamplesPerSec * afd->pwfx->nBlockAlign;
 422             break;
 423         case WAVE_FORMAT_ADPCM:
 424             if (afd->dwFormatIndex >= NUM_ADPCM_FORMATS) return ACMERR_NOTPOSSIBLE;
 425             if (afd->cbwfx < sizeof(ADPCMWAVEFORMAT) + (7 - 1) * sizeof(ADPCMCOEFSET))
 426                 return ACMERR_NOTPOSSIBLE;
 427             afd->pwfx->nChannels = ADPCM_Formats[afd->dwFormatIndex].nChannels;
 428             afd->pwfx->nSamplesPerSec = ADPCM_Formats[afd->dwFormatIndex].rate;
 429             afd->pwfx->wBitsPerSample = ADPCM_Formats[afd->dwFormatIndex].nBits;
 430             init_wfx_adpcm((ADPCMWAVEFORMAT*)afd->pwfx);
 431             break;
 432         default:
 433             WARN("Unsupported tag %08x\n", afd->dwFormatTag);
 434             return MMSYSERR_INVALPARAM;
 435         }
 436         break;
 437     default:
 438         WARN("Unsupported query %08x\n", dwQuery);
 439         return MMSYSERR_NOTSUPPORTED;
 440     }
 441     afd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
 442     afd->szFormat[0] = 0; /* let MSACM format this for us... */
 443
 444     return MMSYSERR_NOERROR;
 445 }
 446
 447 /***********************************************************************
 448  *           ADPCM_FormatSuggest
 449  *
 450  */
 451 static  LRESULT ADPCM_FormatSuggest(PACMDRVFORMATSUGGEST adfs)
 452 {
 453     /* some tests ... */
 454     if (adfs->cbwfxSrc < sizeof(PCMWAVEFORMAT) ||
 455         adfs->cbwfxDst < sizeof(PCMWAVEFORMAT) ||
 456         ADPCM_GetFormatIndex(adfs->pwfxSrc) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
 457     /* FIXME: should do those tests against the real size (according to format tag */
 458
 459     /* If no suggestion for destination, then copy source value */
 460     if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_NCHANNELS))
 461         adfs->pwfxDst->nChannels = adfs->pwfxSrc->nChannels;
 462     if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_NSAMPLESPERSEC))
 463         adfs->pwfxDst->nSamplesPerSec = adfs->pwfxSrc->nSamplesPerSec;
 464
 465     if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WBITSPERSAMPLE))
 466     {
 467         if (adfs->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM)
 468             adfs->pwfxDst->wBitsPerSample = 4;
 469         else
 470             adfs->pwfxDst->wBitsPerSample = 16;
 471     }
 472     if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WFORMATTAG))
 473     {
 474         if (adfs->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM)
 475             adfs->pwfxDst->wFormatTag = WAVE_FORMAT_ADPCM;
 476         else
 477             adfs->pwfxDst->wFormatTag = WAVE_FORMAT_PCM;
 478     }
 479
 480     /* check if result is ok */
 481     if (ADPCM_GetFormatIndex(adfs->pwfxDst) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
 482
 483     /* recompute other values */
 484     switch (adfs->pwfxDst->wFormatTag)
 485     {
 486     case WAVE_FORMAT_PCM:
 487         adfs->pwfxDst->nBlockAlign = (adfs->pwfxDst->nChannels * adfs->pwfxDst->wBitsPerSample) / 8;
 488         adfs->pwfxDst->nAvgBytesPerSec = adfs->pwfxDst->nSamplesPerSec * adfs->pwfxDst->nBlockAlign;
 489         break;
 490     case WAVE_FORMAT_ADPCM:
 491         init_wfx_adpcm((ADPCMWAVEFORMAT*)adfs->pwfxDst);
 492         break;
 493     default:
 494         FIXME("\n");
 495         break;
 496     }
 497
 498     return MMSYSERR_NOERROR;
 499 }
 500
 501 /***********************************************************************
 502  *           ADPCM_Reset
 503  *
 504  */
 505 static  void    ADPCM_Reset(PACMDRVSTREAMINSTANCE adsi, AcmAdpcmData* aad)
 506 {
 507 }
 508
 509 /***********************************************************************
 510  *           ADPCM_StreamOpen
 511  *
 512  */
 513 static  LRESULT ADPCM_StreamOpen(PACMDRVSTREAMINSTANCE adsi)
 514 {
 515     AcmAdpcmData*       aad;
 516
 517     assert(!(adsi->fdwOpen & ACM_STREAMOPENF_ASYNC));
 518
 519     if (ADPCM_GetFormatIndex(adsi->pwfxSrc) == 0xFFFFFFFF ||
 520         ADPCM_GetFormatIndex(adsi->pwfxDst) == 0xFFFFFFFF)
 521         return ACMERR_NOTPOSSIBLE;
 522
 523     aad = HeapAlloc(GetProcessHeap(), 0, sizeof(AcmAdpcmData));
 524     if (aad == 0) return MMSYSERR_NOMEM;
 525
 526     adsi->dwDriver = (DWORD)aad;
 527
 528     if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
 529         adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
 530     {
 531         goto theEnd;
 532     }
 533     else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ADPCM &&
 534              adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
 535     {
 536         /* resampling or mono <=> stereo not available
 537          * ADPCM algo only define 16 bit per sample output
 538          */
 539         if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
 540             adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels ||
 541             adsi->pwfxDst->wBitsPerSample != 16)
 542             goto theEnd;
 543
 544 #if 0
 545         {
 546             unsigned int nspb = ((IMAADPCMWAVEFORMAT*)adsi->pwfxSrc)->wSamplesPerBlock;
 547             FIXME("spb=%u\n", nspb);
 548
 549             /* we check that in a block, after the header, samples are present on
 550              * 4-sample packet pattern
 551              * we also check that the block alignement is bigger than the expected size
 552              */
 553             if (((nspb - 1) & 3) != 0) goto theEnd;
 554             if ((((nspb - 1) / 2) + 4) * adsi->pwfxSrc->nChannels < adsi->pwfxSrc->nBlockAlign)
 555                 goto theEnd;
 556         }
 557 #endif
 558
 559         /* adpcm decoding... */
 560         if (adsi->pwfxDst->wBitsPerSample == 16 && adsi->pwfxDst->nChannels == 2)
 561             aad->convert = cvtSSms16K;
 562         if (adsi->pwfxDst->wBitsPerSample == 16 && adsi->pwfxDst->nChannels == 1)
 563             aad->convert = cvtMMms16K;
 564     }
 565     else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
 566              adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ADPCM)
 567     {
 568         if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
 569             adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels ||
 570             adsi->pwfxSrc->wBitsPerSample != 16)
 571             goto theEnd;
 572 #if 0
 573         nspb = ((IMAADPCMWAVEFORMAT*)adsi->pwfxDst)->wSamplesPerBlock;
 574         FIXME("spb=%u\n", nspb);
 575
 576         /* we check that in a block, after the header, samples are present on
 577          * 4-sample packet pattern
 578          * we also check that the block alignement is bigger than the expected size
 579          */
 580         if (((nspb - 1) & 3) != 0) goto theEnd;
 581         if ((((nspb - 1) / 2) + 4) * adsi->pwfxDst->nChannels < adsi->pwfxDst->nBlockAlign)
 582             goto theEnd;
 583 #endif
 584 #if 0
 585         /* adpcm coding... */
 586         if (adsi->pwfxSrc->wBitsPerSample == 16 && adsi->pwfxSrc->nChannels == 2)
 587             aad->convert = cvtSS16msK;
 588         if (adsi->pwfxSrc->wBitsPerSample == 16 && adsi->pwfxSrc->nChannels == 1)
 589             aad->convert = cvtMM16msK;
 590 #endif
 591         FIXME("We don't support encoding yet\n");
 592         goto theEnd;
 593     }
 594     else goto theEnd;
 595     ADPCM_Reset(adsi, aad);
 596
 597     return MMSYSERR_NOERROR;
 598
 599  theEnd:
 600     HeapFree(GetProcessHeap(), 0, aad);
 601     adsi->dwDriver = 0L;
 602     return MMSYSERR_NOTSUPPORTED;
 603 }
 604
 605 /***********************************************************************
 606  *           ADPCM_StreamClose
 607  *
 608  */
 609 static  LRESULT ADPCM_StreamClose(PACMDRVSTREAMINSTANCE adsi)
 610 {
 611     HeapFree(GetProcessHeap(), 0, (void*)adsi->dwDriver);
 612     return MMSYSERR_NOERROR;
 613 }
 614
 615 /***********************************************************************
 616  *           ADPCM_round
 617  *
 618  */
 619 static  inline DWORD    ADPCM_round(DWORD a, DWORD b, DWORD c)
 620 {
 621     assert(a && b && c);
 622     /* to be sure, always return an entire number of c... */
 623     return ((double)a * (double)b + (double)c - 1) / (double)c;
 624 }
 625
 626 /***********************************************************************
 627  *           ADPCM_StreamSize
 628  *
 629  */
 630 static  LRESULT ADPCM_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE adss)
 631 {
 632     switch (adss->fdwSize)
 633     {
 634     case ACM_STREAMSIZEF_DESTINATION:
 635         /* cbDstLength => cbSrcLength */
 636         if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
 637             adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ADPCM)
 638         {
 639             /* don't take block overhead into account, doesn't matter too much */
 640             adss->cbSrcLength = adss->cbDstLength * 4;
 641         }
 642         else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ADPCM &&
 643                  adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
 644         {
 645             FIXME("misses the block header overhead\n");
 646             adss->cbSrcLength = 256 + adss->cbDstLength / 4;
 647         }
 648         else
 649         {
 650             return MMSYSERR_NOTSUPPORTED;
 651         }
 652         break;
 653     case ACM_STREAMSIZEF_SOURCE:
 654         /* cbSrcLength => cbDstLength */
 655         if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
 656             adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ADPCM)
 657         {
 658             FIXME("misses the block header overhead\n");
 659             adss->cbDstLength = 256 + adss->cbSrcLength / 4;
 660         }
 661         else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ADPCM &&
 662                  adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
 663         {
 664             /* don't take block overhead into account, doesn't matter too much */
 665             adss->cbDstLength = adss->cbSrcLength * 4;
 666         }
 667         else
 668         {
 669             return MMSYSERR_NOTSUPPORTED;
 670         }
 671         break;
 672     default:
 673         WARN("Unsupported query %08x\n", adss->fdwSize);
 674         return MMSYSERR_NOTSUPPORTED;
 675     }
 676     return MMSYSERR_NOERROR;
 677 }
 678
 679 /***********************************************************************
 680  *           ADPCM_StreamConvert
 681  *
 682  */
 683 static LRESULT ADPCM_StreamConvert(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMHEADER adsh)
 684 {
 685     AcmAdpcmData*       aad = (AcmAdpcmData*)adsi->dwDriver;
 686     DWORD               nsrc = adsh->cbSrcLength;
 687     DWORD               ndst = adsh->cbDstLength;
 688
 689     if (adsh->fdwConvert &
 690         ~(ACM_STREAMCONVERTF_BLOCKALIGN|
 691           ACM_STREAMCONVERTF_END|
 692           ACM_STREAMCONVERTF_START))
 693     {
 694         FIXME("Unsupported fdwConvert (%08x), ignoring it\n", adsh->fdwConvert);
 695     }
 696     /* ACM_STREAMCONVERTF_BLOCKALIGN
 697      *  currently all conversions are block aligned, so do nothing for this flag
 698      * ACM_STREAMCONVERTF_END
 699      *  no pending data, so do nothing for this flag
 700      */
 701     if ((adsh->fdwConvert & ACM_STREAMCONVERTF_START))
 702     {
 703         ADPCM_Reset(adsi, aad);
 704     }
 705
 706     aad->convert(adsi, adsh->pbSrc, &nsrc, adsh->pbDst, &ndst);
 707     adsh->cbSrcLengthUsed = nsrc;
 708     adsh->cbDstLengthUsed = ndst;
 709
 710     return MMSYSERR_NOERROR;
 711 }
 712
 713 /**************************************************************************
 714  *                      ADPCM_DriverProc                        [exported]
 715  */
 716 LRESULT CALLBACK ADPCM_DriverProc(DWORD_PTR dwDevID, HDRVR hDriv, UINT wMsg,
 717                                          LPARAM dwParam1, LPARAM dwParam2)
 718 {
 719     TRACE("(%08lx %p %04x %08lx %08lx);\n",
 720           dwDevID, hDriv, wMsg, dwParam1, dwParam2);
 721
 722     switch (wMsg)
 723     {
 724     case DRV_LOAD:              return 1;
 725     case DRV_FREE:              return 1;
 726     case DRV_OPEN:              return ADPCM_drvOpen((LPSTR)dwParam1);
 727     case DRV_CLOSE:             return ADPCM_drvClose(dwDevID);
 728     case DRV_ENABLE:            return 1;
 729     case DRV_DISABLE:           return 1;
 730     case DRV_QUERYCONFIGURE:    return 1;
 731     case DRV_CONFIGURE:         MessageBoxA(0, "MSACM MS ADPCM filter !", "Wine Driver", MB_OK); return 1;
 732     case DRV_INSTALL:           return DRVCNF_RESTART;
 733     case DRV_REMOVE:            return DRVCNF_RESTART;
 734
 735     case ACMDM_DRIVER_NOTIFY:
 736         /* no caching from other ACM drivers is done so far */
 737         return MMSYSERR_NOERROR;
 738
 739     case ACMDM_DRIVER_DETAILS:
 740         return ADPCM_DriverDetails((PACMDRIVERDETAILSW)dwParam1);
 741
 742     case ACMDM_FORMATTAG_DETAILS:
 743         return ADPCM_FormatTagDetails((PACMFORMATTAGDETAILSW)dwParam1, dwParam2);
 744
 745     case ACMDM_FORMAT_DETAILS:
 746         return ADPCM_FormatDetails((PACMFORMATDETAILSW)dwParam1, dwParam2);
 747
 748     case ACMDM_FORMAT_SUGGEST:
 749         return ADPCM_FormatSuggest((PACMDRVFORMATSUGGEST)dwParam1);
 750
 751     case ACMDM_STREAM_OPEN:
 752         return ADPCM_StreamOpen((PACMDRVSTREAMINSTANCE)dwParam1);
 753
 754     case ACMDM_STREAM_CLOSE:
 755         return ADPCM_StreamClose((PACMDRVSTREAMINSTANCE)dwParam1);
 756
 757     case ACMDM_STREAM_SIZE:
 758         return ADPCM_StreamSize((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMSIZE)dwParam2);
 759
 760     case ACMDM_STREAM_CONVERT:
 761         return ADPCM_StreamConvert((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMHEADER)dwParam2);
 762
 763     case ACMDM_HARDWARE_WAVE_CAPS_INPUT:
 764     case ACMDM_HARDWARE_WAVE_CAPS_OUTPUT:
 765         /* this converter is not a hardware driver */
 766     case ACMDM_FILTERTAG_DETAILS:
 767     case ACMDM_FILTER_DETAILS:
 768         /* this converter is not a filter */
 769     case ACMDM_STREAM_RESET:
 770         /* only needed for asynchronous driver... we aren't, so just say it */
 771         return MMSYSERR_NOTSUPPORTED;
 772     case ACMDM_STREAM_PREPARE:
 773     case ACMDM_STREAM_UNPREPARE:
 774         /* nothing special to do here... so don't do anything */
 775         return MMSYSERR_NOERROR;
 776
 777     default:
 778         return DefDriverProc(dwDevID, hDriv, wMsg, dwParam1, dwParam2);
 779     }
 780 }