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Sweden-Number/dlls/l3codeca.acm/mpegl3.c

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/*
* MPEG Layer 3 handling
*
* Copyright (C) 2002 Eric Pouech
* Copyright (C) 2009 CodeWeavers, Aric Stewart
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdarg.h>
#include <string.h>
#include <mpg123.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winnls.h"
#include "mmsystem.h"
#include "mmreg.h"
#include "msacm.h"
#include "msacmdrv.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(mpeg3);
/* table to list all supported formats... those are the basic ones. this
* also helps given a unique index to each of the supported formats
*/
typedef struct
{
int nChannels;
int nBits;
int rate;
} Format;
static const Format PCM_Formats[] =
{
{1, 8, 8000}, {2, 8, 8000}, {1, 16, 8000}, {2, 16, 8000},
{1, 8, 11025}, {2, 8, 11025}, {1, 16, 11025}, {2, 16, 11025},
{1, 8, 12000}, {2, 8, 12000}, {1, 16, 12000}, {2, 16, 12000},
{1, 8, 16000}, {2, 8, 16000}, {1, 16, 16000}, {2, 16, 16000},
{1, 8, 22050}, {2, 8, 22050}, {1, 16, 22050}, {2, 16, 22050},
{1, 8, 24000}, {2, 8, 24000}, {1, 16, 24000}, {2, 16, 24000},
{1, 8, 32000}, {2, 8, 32000}, {1, 16, 32000}, {2, 16, 32000},
{1, 8, 44100}, {2, 8, 44100}, {1, 16, 44100}, {2, 16, 44100},
{1, 8, 48000}, {2, 8, 48000}, {1, 16, 48000}, {2, 16, 48000}
};
static const Format MPEG3_Formats[] =
{
{1, 0, 8000}, {2, 0, 8000},
{1, 0, 11025}, {2, 0, 11025},
{1, 0, 12000}, {2, 0, 12000},
{1, 0, 16000}, {2, 0, 16000},
{1, 0, 22050}, {2, 0, 22050},
{1, 0, 24000}, {2, 0, 24000},
{1, 0, 32000}, {2, 0, 32000},
{1, 0, 44100}, {2, 0, 44100},
{1, 0, 48000}, {2, 0, 48000}
};
/***********************************************************************
* MPEG3_GetFormatIndex
*/
static DWORD MPEG3_GetFormatIndex(LPWAVEFORMATEX wfx)
{
int i, hi;
const Format *fmts;
switch (wfx->wFormatTag)
{
case WAVE_FORMAT_PCM:
hi = ARRAY_SIZE(PCM_Formats);
fmts = PCM_Formats;
break;
case WAVE_FORMAT_MPEG:
case WAVE_FORMAT_MPEGLAYER3:
hi = ARRAY_SIZE(MPEG3_Formats);
fmts = MPEG3_Formats;
break;
default:
return 0xFFFFFFFF;
}
for (i = 0; i < hi; i++)
{
if (wfx->nChannels == fmts[i].nChannels &&
wfx->nSamplesPerSec == fmts[i].rate &&
(wfx->wBitsPerSample == fmts[i].nBits || !fmts[i].nBits))
return i;
}
return 0xFFFFFFFF;
}
/***********************************************************************
* MPEG3_drvOpen
*/
static LRESULT MPEG3_drvOpen(LPCSTR str)
{
mpg123_init();
return 1;
}
/***********************************************************************
* MPEG3_drvClose
*/
static LRESULT MPEG3_drvClose(DWORD_PTR dwDevID)
{
mpg123_exit();
return 1;
}
static void mp3_horse(mpg123_handle *handle, const unsigned char *src,
DWORD *nsrc, unsigned char *dst, DWORD *ndst)
{
int ret;
size_t size;
DWORD dpos = 0;
if (*nsrc > 0)
{
ret = mpg123_feed(handle, src, *nsrc);
if (ret != MPG123_OK)
{
ERR("Error feeding data\n");
*ndst = *nsrc = 0;
return;
}
}
do {
size = 0;
ret = mpg123_read(handle, dst + dpos, *ndst - dpos, &size);
if (ret == MPG123_ERR)
{
FIXME("Error occurred during decoding!\n");
*ndst = *nsrc = 0;
return;
}
if (ret == MPG123_NEW_FORMAT)
{
long rate;
int channels, enc;
mpg123_getformat(handle, &rate, &channels, &enc);
TRACE("New format: %li Hz, %i channels, encoding value %i\n", rate, channels, enc);
}
dpos += size;
if (dpos >= *ndst) break;
} while (ret != MPG123_ERR && ret != MPG123_NEED_MORE);
*ndst = dpos;
}
/***********************************************************************
* MPEG3_StreamOpen
*
*/
static LRESULT MPEG3_StreamOpen(ACMDRVSTREAMINSTANCE *instance)
{
mpg123_handle *handle;
int err;
assert(!(instance->fdwOpen & ACM_STREAMOPENF_ASYNC));
if (MPEG3_GetFormatIndex(instance->pwfxSrc) == 0xFFFFFFFF
|| MPEG3_GetFormatIndex(instance->pwfxDst) == 0xFFFFFFFF)
return ACMERR_NOTPOSSIBLE;
if (instance->pwfxDst->wFormatTag != WAVE_FORMAT_PCM)
return MMSYSERR_NOTSUPPORTED;
if (instance->pwfxSrc->wFormatTag != WAVE_FORMAT_MPEGLAYER3
&& instance->pwfxSrc->wFormatTag != WAVE_FORMAT_MPEG)
return MMSYSERR_NOTSUPPORTED;
if (instance->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEGLAYER3)
{
MPEGLAYER3WAVEFORMAT *mp3_format = (MPEGLAYER3WAVEFORMAT *)instance->pwfxSrc;
if (instance->pwfxSrc->cbSize < MPEGLAYER3_WFX_EXTRA_BYTES
|| mp3_format->wID != MPEGLAYER3_ID_MPEG)
return ACMERR_NOTPOSSIBLE;
}
if (instance->pwfxSrc->nSamplesPerSec != instance->pwfxDst->nSamplesPerSec
|| instance->pwfxSrc->nChannels != instance->pwfxDst->nChannels
|| instance->pwfxDst->wBitsPerSample != 16)
return MMSYSERR_NOTSUPPORTED;
handle = mpg123_new(NULL, &err);
instance->dwDriver = (DWORD_PTR)handle;
mpg123_open_feed(handle);
#if MPG123_API_VERSION >= 31 /* needed for MPG123_IGNORE_FRAMEINFO enum value */
/* mpg123 may find a XING header in the mp3 and use that information
* to ask for seeks in order to read specific frames in the file.
* We cannot allow that since the caller application is feeding us.
* This fixes problems for mp3 files encoded with LAME (bug 42361)
*/
mpg123_param(handle, MPG123_ADD_FLAGS, MPG123_IGNORE_INFOFRAME, 0);
#endif
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_StreamClose
*
*/
static LRESULT MPEG3_StreamClose(ACMDRVSTREAMINSTANCE *instance)
{
mpg123_handle *handle = (mpg123_handle *)instance->dwDriver;
mpg123_close(handle);
mpg123_delete(handle);
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_DriverDetails
*
*/
static LRESULT MPEG3_DriverDetails(PACMDRIVERDETAILSW add)
{
add->fccType = ACMDRIVERDETAILS_FCCTYPE_AUDIOCODEC;
add->fccComp = ACMDRIVERDETAILS_FCCCOMP_UNDEFINED;
add->wMid = MM_FRAUNHOFER_IIS;
add->wPid = MM_FHGIIS_MPEGLAYER3_DECODE;
add->vdwACM = 0x01000000;
add->vdwDriver = 0x01000000;
add->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
add->cFormatTags = 3; /* PCM, MPEG3 */
add->cFilterTags = 0;
add->hicon = NULL;
MultiByteToWideChar( CP_ACP, 0, "MPEG Layer-3 Codec", -1,
add->szShortName, ARRAY_SIZE( add->szShortName ));
MultiByteToWideChar( CP_ACP, 0, "Wine MPEG3 decoder", -1,
add->szLongName, ARRAY_SIZE( add->szLongName ));
MultiByteToWideChar( CP_ACP, 0, "Brought to you by the Wine team...", -1,
add->szCopyright, ARRAY_SIZE( add->szCopyright ));
MultiByteToWideChar( CP_ACP, 0, "Refer to LICENSE file", -1,
add->szLicensing, ARRAY_SIZE( add->szLicensing ));
add->szFeatures[0] = 0;
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_FormatTagDetails
*
*/
static LRESULT MPEG3_FormatTagDetails(PACMFORMATTAGDETAILSW aftd, DWORD dwQuery)
{
static const WCHAR szPcm[]={'P','C','M',0};
static const WCHAR szMpeg3[]={'M','P','e','g','3',0};
static const WCHAR szMpeg[]={'M','P','e','g',0};
switch (dwQuery)
{
case ACM_FORMATTAGDETAILSF_INDEX:
if (aftd->dwFormatTagIndex > 2) return ACMERR_NOTPOSSIBLE;
break;
case ACM_FORMATTAGDETAILSF_LARGESTSIZE:
if (aftd->dwFormatTag == WAVE_FORMAT_UNKNOWN)
{
aftd->dwFormatTagIndex = 2; /* WAVE_FORMAT_MPEG is biggest */
break;
}
/* fall through */
case ACM_FORMATTAGDETAILSF_FORMATTAG:
switch (aftd->dwFormatTag)
{
case WAVE_FORMAT_PCM: aftd->dwFormatTagIndex = 0; break;
case WAVE_FORMAT_MPEGLAYER3: aftd->dwFormatTagIndex = 1; break;
case WAVE_FORMAT_MPEG: aftd->dwFormatTagIndex = 2; break;
default: return ACMERR_NOTPOSSIBLE;
}
break;
default:
WARN("Unsupported query %08x\n", dwQuery);
return MMSYSERR_NOTSUPPORTED;
}
aftd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
switch (aftd->dwFormatTagIndex)
{
case 0:
aftd->dwFormatTag = WAVE_FORMAT_PCM;
aftd->cbFormatSize = sizeof(PCMWAVEFORMAT);
aftd->cStandardFormats = ARRAY_SIZE(PCM_Formats);
lstrcpyW(aftd->szFormatTag, szPcm);
break;
case 1:
aftd->dwFormatTag = WAVE_FORMAT_MPEGLAYER3;
aftd->cbFormatSize = sizeof(MPEGLAYER3WAVEFORMAT);
aftd->cStandardFormats = 0;
lstrcpyW(aftd->szFormatTag, szMpeg3);
break;
case 2:
aftd->dwFormatTag = WAVE_FORMAT_MPEG;
aftd->cbFormatSize = sizeof(MPEG1WAVEFORMAT);
aftd->cStandardFormats = 0;
lstrcpyW(aftd->szFormatTag, szMpeg);
break;
}
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_FormatDetails
*
*/
static LRESULT MPEG3_FormatDetails(PACMFORMATDETAILSW afd, DWORD dwQuery)
{
switch (dwQuery)
{
case ACM_FORMATDETAILSF_FORMAT:
if (MPEG3_GetFormatIndex(afd->pwfx) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
break;
case ACM_FORMATDETAILSF_INDEX:
afd->pwfx->wFormatTag = afd->dwFormatTag;
switch (afd->dwFormatTag)
{
case WAVE_FORMAT_PCM:
if (afd->dwFormatIndex >= ARRAY_SIZE(PCM_Formats)) return ACMERR_NOTPOSSIBLE;
afd->pwfx->nChannels = PCM_Formats[afd->dwFormatIndex].nChannels;
afd->pwfx->nSamplesPerSec = PCM_Formats[afd->dwFormatIndex].rate;
afd->pwfx->wBitsPerSample = PCM_Formats[afd->dwFormatIndex].nBits;
/* native MSACM uses a PCMWAVEFORMAT structure, so cbSize is not accessible
* afd->pwfx->cbSize = 0;
*/
afd->pwfx->nBlockAlign =
(afd->pwfx->nChannels * afd->pwfx->wBitsPerSample) / 8;
afd->pwfx->nAvgBytesPerSec =
afd->pwfx->nSamplesPerSec * afd->pwfx->nBlockAlign;
break;
case WAVE_FORMAT_MPEGLAYER3:
case WAVE_FORMAT_MPEG:
WARN("Encoding to MPEG is not supported\n");
return ACMERR_NOTPOSSIBLE;
default:
WARN("Unsupported tag %08x\n", afd->dwFormatTag);
return MMSYSERR_INVALPARAM;
}
break;
default:
WARN("Unsupported query %08x\n", dwQuery);
return MMSYSERR_NOTSUPPORTED;
}
afd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
afd->szFormat[0] = 0; /* let MSACM format this for us... */
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_FormatSuggest
*
*/
static LRESULT MPEG3_FormatSuggest(PACMDRVFORMATSUGGEST adfs)
{
/* some tests ... */
if (adfs->cbwfxSrc < sizeof(PCMWAVEFORMAT) ||
adfs->cbwfxDst < sizeof(PCMWAVEFORMAT) ||
MPEG3_GetFormatIndex(adfs->pwfxSrc) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
/* FIXME: should do those tests against the real size (according to format tag */
/* If no suggestion for destination, then copy source value */
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_NCHANNELS))
adfs->pwfxDst->nChannels = adfs->pwfxSrc->nChannels;
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_NSAMPLESPERSEC))
adfs->pwfxDst->nSamplesPerSec = adfs->pwfxSrc->nSamplesPerSec;
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WBITSPERSAMPLE))
adfs->pwfxDst->wBitsPerSample = 16;
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WFORMATTAG))
{
if (adfs->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM)
{
WARN("Encoding to MPEG is not supported\n");
return ACMERR_NOTPOSSIBLE;
}
else
adfs->pwfxDst->wFormatTag = WAVE_FORMAT_PCM;
}
/* check if result is ok */
if (MPEG3_GetFormatIndex(adfs->pwfxDst) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
/* recompute other values */
switch (adfs->pwfxDst->wFormatTag)
{
case WAVE_FORMAT_PCM:
adfs->pwfxDst->nBlockAlign = (adfs->pwfxDst->nChannels * adfs->pwfxDst->wBitsPerSample) / 8;
adfs->pwfxDst->nAvgBytesPerSec = adfs->pwfxDst->nSamplesPerSec * adfs->pwfxDst->nBlockAlign;
break;
case WAVE_FORMAT_MPEG:
case WAVE_FORMAT_MPEGLAYER3:
WARN("Encoding to MPEG is not supported\n");
return ACMERR_NOTPOSSIBLE;
break;
default:
FIXME("\n");
break;
}
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_StreamSize
*
*/
static LRESULT MPEG3_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE adss)
{
DWORD nblocks;
switch (adss->fdwSize)
{
case ACM_STREAMSIZEF_DESTINATION:
/* cbDstLength => cbSrcLength */
if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
(adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MPEGLAYER3 ||
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MPEG))
{
nblocks = (adss->cbDstLength - 3000) / (DWORD)(adsi->pwfxDst->nAvgBytesPerSec * 1152 / adsi->pwfxDst->nSamplesPerSec + 0.5);
if (nblocks == 0)
return ACMERR_NOTPOSSIBLE;
adss->cbSrcLength = nblocks * 1152 * adsi->pwfxSrc->nBlockAlign;
}
else if ((adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEGLAYER3 ||
adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEG) &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
nblocks = adss->cbDstLength / (adsi->pwfxDst->nBlockAlign * 1152);
if (nblocks == 0)
return ACMERR_NOTPOSSIBLE;
adss->cbSrcLength = nblocks * (DWORD)(adsi->pwfxSrc->nAvgBytesPerSec * 1152 / adsi->pwfxSrc->nSamplesPerSec);
}
else
{
return MMSYSERR_NOTSUPPORTED;
}
break;
case ACM_STREAMSIZEF_SOURCE:
/* cbSrcLength => cbDstLength */
if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
(adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MPEGLAYER3 ||
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MPEG))
{
nblocks = adss->cbSrcLength / (adsi->pwfxSrc->nBlockAlign * 1152);
if (adss->cbSrcLength % (DWORD)(adsi->pwfxSrc->nBlockAlign * 1152))
/* Round block count up. */
nblocks++;
if (nblocks == 0)
return ACMERR_NOTPOSSIBLE;
adss->cbDstLength = 3000 + nblocks * (DWORD)(adsi->pwfxDst->nAvgBytesPerSec * 1152 / adsi->pwfxDst->nSamplesPerSec + 0.5);
}
else if ((adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEGLAYER3 ||
adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEG) &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
nblocks = adss->cbSrcLength / (DWORD)(adsi->pwfxSrc->nAvgBytesPerSec * 1152 / adsi->pwfxSrc->nSamplesPerSec);
if (adss->cbSrcLength % (DWORD)(adsi->pwfxSrc->nAvgBytesPerSec * 1152 / adsi->pwfxSrc->nSamplesPerSec))
/* Round block count up. */
nblocks++;
if (nblocks == 0)
return ACMERR_NOTPOSSIBLE;
adss->cbDstLength = nblocks * 1152 * adsi->pwfxDst->nBlockAlign;
}
else
{
return MMSYSERR_NOTSUPPORTED;
}
break;
default:
WARN("Unsupported query %08x\n", adss->fdwSize);
return MMSYSERR_NOTSUPPORTED;
}
return MMSYSERR_NOERROR;
}
/***********************************************************************
* MPEG3_StreamConvert
*
*/
static LRESULT MPEG3_StreamConvert(ACMDRVSTREAMINSTANCE *instance, ACMDRVSTREAMHEADER *adsh)
{
mpg123_handle *handle = (mpg123_handle *)instance->dwDriver;
DWORD nsrc = adsh->cbSrcLength;
DWORD ndst = adsh->cbDstLength;
if (adsh->fdwConvert &
~(ACM_STREAMCONVERTF_BLOCKALIGN|
ACM_STREAMCONVERTF_END|
ACM_STREAMCONVERTF_START))
{
FIXME("Unsupported fdwConvert (%08x), ignoring it\n", adsh->fdwConvert);
}
/* ACM_STREAMCONVERTF_BLOCKALIGN
* currently all conversions are block aligned, so do nothing for this flag
* ACM_STREAMCONVERTF_END
* no pending data, so do nothing for this flag
*/
if ((adsh->fdwConvert & ACM_STREAMCONVERTF_START))
{
mpg123_feedseek(handle, 0, SEEK_SET, NULL);
mpg123_close(handle);
mpg123_open_feed(handle);
}
mp3_horse(handle, adsh->pbSrc, &nsrc, adsh->pbDst, &ndst);
adsh->cbSrcLengthUsed = nsrc;
adsh->cbDstLengthUsed = ndst;
return MMSYSERR_NOERROR;
}
/**************************************************************************
* MPEG3_DriverProc [exported]
*/
LRESULT CALLBACK MPEG3_DriverProc(DWORD_PTR dwDevID, HDRVR hDriv, UINT wMsg,
LPARAM dwParam1, LPARAM dwParam2)
{
TRACE("(%08lx %p %04x %08lx %08lx);\n",
dwDevID, hDriv, wMsg, dwParam1, dwParam2);
switch (wMsg)
{
case DRV_LOAD: return 1;
case DRV_FREE: return 1;
case DRV_OPEN: return MPEG3_drvOpen((LPSTR)dwParam1);
case DRV_CLOSE: return MPEG3_drvClose(dwDevID);
case DRV_ENABLE: return 1;
case DRV_DISABLE: return 1;
case DRV_QUERYCONFIGURE: return 1;
case DRV_CONFIGURE: MessageBoxA(0, "MPEG3 filter !", "Wine Driver", MB_OK); return 1;
case DRV_INSTALL: return DRVCNF_RESTART;
case DRV_REMOVE: return DRVCNF_RESTART;
case ACMDM_DRIVER_NOTIFY:
/* no caching from other ACM drivers is done so far */
return MMSYSERR_NOERROR;
case ACMDM_DRIVER_DETAILS:
return MPEG3_DriverDetails((PACMDRIVERDETAILSW)dwParam1);
case ACMDM_FORMATTAG_DETAILS:
return MPEG3_FormatTagDetails((PACMFORMATTAGDETAILSW)dwParam1, dwParam2);
case ACMDM_FORMAT_DETAILS:
return MPEG3_FormatDetails((PACMFORMATDETAILSW)dwParam1, dwParam2);
case ACMDM_FORMAT_SUGGEST:
return MPEG3_FormatSuggest((PACMDRVFORMATSUGGEST)dwParam1);
case ACMDM_STREAM_OPEN:
return MPEG3_StreamOpen((PACMDRVSTREAMINSTANCE)dwParam1);
case ACMDM_STREAM_CLOSE:
return MPEG3_StreamClose((PACMDRVSTREAMINSTANCE)dwParam1);
case ACMDM_STREAM_SIZE:
return MPEG3_StreamSize((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMSIZE)dwParam2);
case ACMDM_STREAM_CONVERT:
return MPEG3_StreamConvert((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMHEADER)dwParam2);
case ACMDM_HARDWARE_WAVE_CAPS_INPUT:
case ACMDM_HARDWARE_WAVE_CAPS_OUTPUT:
/* this converter is not a hardware driver */
case ACMDM_FILTERTAG_DETAILS:
case ACMDM_FILTER_DETAILS:
/* this converter is not a filter */
case ACMDM_STREAM_RESET:
/* only needed for asynchronous driver... we aren't, so just say it */
return MMSYSERR_NOTSUPPORTED;
case ACMDM_STREAM_PREPARE:
case ACMDM_STREAM_UNPREPARE:
/* nothing special to do here... so don't do anything */
return MMSYSERR_NOERROR;
default:
return DefDriverProc(dwDevID, hDriv, wMsg, dwParam1, dwParam2);
}
}
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