pcmconverter.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

/***********************************************************************
 *           PCM_DriverDetails
 *
 */
static	LRESULT PCM_DriverDetails(PACMDRIVERDETAILSW add)
{
    TRACE("(%p)\n", add);

    add->fccType = ACMDRIVERDETAILS_FCCTYPE_AUDIOCODEC;
    add->fccComp = ACMDRIVERDETAILS_FCCCOMP_UNDEFINED;
    add->wMid = 0xFF;
    add->wPid = 0x00;
    add->vdwACM = 0x01000000;
    add->vdwDriver = 0x01000000;
    add->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CONVERTER;
    add->cFormatTags = 1;
    add->cFilterTags = 0;
    add->hicon = NULL;
    MultiByteToWideChar( CP_ACP, 0, "WINE-PCM", -1,
                         add->szShortName, sizeof(add->szShortName)/sizeof(WCHAR) );
    MultiByteToWideChar( CP_ACP, 0, "Wine PCM converter", -1,
                         add->szLongName, sizeof(add->szLongName)/sizeof(WCHAR) );
    MultiByteToWideChar( CP_ACP, 0, "Brought to you by the Wine team...", -1,
                         add->szCopyright, sizeof(add->szCopyright)/sizeof(WCHAR) );
    MultiByteToWideChar( CP_ACP, 0, "Refer to LICENSE file", -1,
                         add->szLicensing, sizeof(add->szLicensing)/sizeof(WCHAR) );
    add->szFeatures[0] = 0;

    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_FormatTagDetails
 *
 */
static	LRESULT	PCM_FormatTagDetails(PACMFORMATTAGDETAILSW aftd, DWORD dwQuery)
{
    TRACE("(%p, %08lx)\n", aftd, dwQuery);

    switch (dwQuery) {
    case ACM_FORMATTAGDETAILSF_INDEX:
	if (aftd->dwFormatTagIndex != 0) {
            WARN("not possible\n");
            return ACMERR_NOTPOSSIBLE;
        }
	break;
    case ACM_FORMATTAGDETAILSF_FORMATTAG:
	if (aftd->dwFormatTag != WAVE_FORMAT_PCM) {
            WARN("not possible\n");
            return ACMERR_NOTPOSSIBLE;
        }
	break;
    case ACM_FORMATTAGDETAILSF_LARGESTSIZE:
	if (aftd->dwFormatTag != WAVE_FORMAT_UNKNOWN &&
	    aftd->dwFormatTag != WAVE_FORMAT_PCM) {
            WARN("not possible\n");
	    return ACMERR_NOTPOSSIBLE;
        }
	break;
    default:
	WARN("Unsupported query %08lx\n", dwQuery);
	return MMSYSERR_NOTSUPPORTED;
    }

    aftd->dwFormatTagIndex = 0;
    aftd->dwFormatTag = WAVE_FORMAT_PCM;
    aftd->cbFormatSize = sizeof(PCMWAVEFORMAT);
    aftd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CONVERTER;
    aftd->cStandardFormats = NUM_PCM_FORMATS;
    aftd->szFormatTag[0] = 0;

    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_FormatDetails
 *
 */
static	LRESULT	PCM_FormatDetails(PACMFORMATDETAILSW afd, DWORD dwQuery)
{
    TRACE("(%p, %08lx)\n", afd, dwQuery);

    switch (dwQuery) {
    case ACM_FORMATDETAILSF_FORMAT:
	if (PCM_GetFormatIndex(afd->pwfx) == 0xFFFFFFFF) {
            return ACMERR_NOTPOSSIBLE;
            WARN("not possible\n");
        }
	break;
    case ACM_FORMATDETAILSF_INDEX:
	assert(afd->dwFormatIndex < NUM_PCM_FORMATS);
	afd->pwfx->wFormatTag = WAVE_FORMAT_PCM;
	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;
    default:
	WARN("Unsupported query %08lx\n", dwQuery);
	return MMSYSERR_NOTSUPPORTED;
    }

    afd->dwFormatTag = WAVE_FORMAT_PCM;
    afd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CONVERTER;
    afd->szFormat[0] = 0; /* let MSACM format this for us... */
    afd->cbwfx = sizeof(PCMWAVEFORMAT);

    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_FormatSuggest
 *
 */
static	LRESULT	PCM_FormatSuggest(PACMDRVFORMATSUGGEST adfs)
{
    TRACE("(%p)\n", adfs);

    /* some tests ... */
    if (adfs->cbwfxSrc < sizeof(PCMWAVEFORMAT) ||
	adfs->cbwfxDst < sizeof(PCMWAVEFORMAT) ||
	PCM_GetFormatIndex(adfs->pwfxSrc) == 0xFFFFFFFF) {
            WARN("not possible\n");
            return ACMERR_NOTPOSSIBLE;
       }

    /* is 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 = adfs->pwfxSrc->wBitsPerSample;
    }
    if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WFORMATTAG)) {
	if (adfs->pwfxSrc->wFormatTag != WAVE_FORMAT_PCM) {
            WARN("not possible\n");
            return ACMERR_NOTPOSSIBLE;
        }
	adfs->pwfxDst->wFormatTag = adfs->pwfxSrc->wFormatTag;
    }
    /* check if result is ok */
    if (PCM_GetFormatIndex(adfs->pwfxDst) == 0xFFFFFFFF) {
        WARN("not possible\n");
        return ACMERR_NOTPOSSIBLE;
    }

    /* recompute other values */
    adfs->pwfxDst->nBlockAlign = (adfs->pwfxDst->nChannels * adfs->pwfxDst->wBitsPerSample) / 8;
    adfs->pwfxDst->nAvgBytesPerSec = adfs->pwfxDst->nSamplesPerSec * adfs->pwfxDst->nBlockAlign;

    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_Reset
 *
 */
static	void	PCM_Reset(AcmPcmData* apd, int srcNumBits)
{
    TRACE("(%p, %d)\n", apd, srcNumBits);

    apd->srcPos = 0;
    apd->dstPos = 0;
    /* initialize with neutral value */
    if (srcNumBits == 16) {
	apd->last[0].s = 0;
	apd->last[1].s = 0;
    } else {
	apd->last[0].b = (BYTE)0x80;
	apd->last[1].b = (BYTE)0x80;
    }
}

/***********************************************************************
 *           PCM_StreamOpen
 *
 */
static	LRESULT	PCM_StreamOpen(PACMDRVSTREAMINSTANCE adsi)
{
    AcmPcmData*	apd;
    int		idx = 0;

    TRACE("(%p)\n", adsi);

    assert(!(adsi->fdwOpen & ACM_STREAMOPENF_ASYNC));

    if (PCM_GetFormatIndex(adsi->pwfxSrc) == 0xFFFFFFFF ||
	PCM_GetFormatIndex(adsi->pwfxDst) == 0xFFFFFFFF) {
        WARN("not possible\n");
	return ACMERR_NOTPOSSIBLE;
    }

    apd = HeapAlloc(GetProcessHeap(), 0, sizeof(AcmPcmData));
    if (apd == 0) {
        WARN("no memory\n");
        return MMSYSERR_NOMEM;
    }

    adsi->dwDriver = (DWORD)apd;
    adsi->fdwDriver = 0;

    if (adsi->pwfxSrc->wBitsPerSample == 16) idx += 8;
    if (adsi->pwfxDst->wBitsPerSample == 16) idx += 4;
    if (adsi->pwfxSrc->nChannels      == 1)  idx += 2;
    if (adsi->pwfxDst->nChannels      == 1)  idx += 1;

    if (adsi->pwfxSrc->nSamplesPerSec == adsi->pwfxDst->nSamplesPerSec) {
	apd->cvt.cvtKeepRate = PCM_ConvertKeepRate[idx];
    } else {
	adsi->fdwDriver |= PCM_RESAMPLE;
	apd->dstIncr = (double)(adsi->pwfxSrc->nSamplesPerSec) /
	    (double)(adsi->pwfxDst->nSamplesPerSec);
	PCM_Reset(apd, adsi->pwfxSrc->wBitsPerSample);
	apd->cvt.cvtChangeRate = PCM_ConvertChangeRate[idx];
    }

    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_StreamClose
 *
 */
static	LRESULT	PCM_StreamClose(PACMDRVSTREAMINSTANCE adsi)
{
    TRACE("(%p)\n", adsi);

    HeapFree(GetProcessHeap(), 0, (void*)adsi->dwDriver);
    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_round
 *
 */
static	inline DWORD	PCM_round(DWORD a, DWORD b, DWORD c)
{
    assert(c);
    /* to be sure, always return an entire number of c... */
    return ((double)a * (double)b + (double)c - 1) / (double)c;
}

/***********************************************************************
 *           PCM_StreamSize
 *
 */
static	LRESULT PCM_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE adss)
{
    DWORD	srcMask = ~(adsi->pwfxSrc->nBlockAlign - 1);
    DWORD	dstMask = ~(adsi->pwfxDst->nBlockAlign - 1);

    TRACE("(%p, %p)\n", adsi, adss);

    switch (adss->fdwSize) {
    case ACM_STREAMSIZEF_DESTINATION:
	/* cbDstLength => cbSrcLength */
	adss->cbSrcLength = PCM_round(adss->cbDstLength & dstMask,
				      adsi->pwfxSrc->nAvgBytesPerSec,
				      adsi->pwfxDst->nAvgBytesPerSec) & srcMask;
	break;
    case ACM_STREAMSIZEF_SOURCE:
	/* cbSrcLength => cbDstLength */
	adss->cbDstLength =  PCM_round(adss->cbSrcLength & srcMask,
				       adsi->pwfxDst->nAvgBytesPerSec,
				       adsi->pwfxSrc->nAvgBytesPerSec) & dstMask;
	break;
    default:
	WARN("Unsupported query %08lx\n", adss->fdwSize);
	return MMSYSERR_NOTSUPPORTED;
    }
    return MMSYSERR_NOERROR;
}

/***********************************************************************
 *           PCM_StreamConvert
 *
 */
static LRESULT PCM_StreamConvert(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMHEADER adsh)
{
    AcmPcmData*	apd = (AcmPcmData*)adsi->dwDriver;
    DWORD	nsrc = NUM_OF(adsh->cbSrcLength, adsi->pwfxSrc->nBlockAlign);
    DWORD	ndst = NUM_OF(adsh->cbDstLength, adsi->pwfxDst->nBlockAlign);

    TRACE("(%p, %p)\n", adsi, adsh);

    TRACE("nsrc=%ld,adsh->cbSrcLength=%ld\n", nsrc, adsh->cbSrcLength);
    TRACE("ndst=%ld,adsh->cbDstLength=%ld\n", ndst, adsh->cbDstLength);
    TRACE("src [wFormatTag=%u, nChannels=%u, nSamplesPerSec=%lu, nAvgBytesPerSec=%lu, nBlockAlign=%u, wBitsPerSample=%u, cbSize=%u]\n",
          adsi->pwfxSrc->wFormatTag, adsi->pwfxSrc->nChannels, adsi->pwfxSrc->nSamplesPerSec, adsi->pwfxSrc->nAvgBytesPerSec,
          adsi->pwfxSrc->nBlockAlign, adsi->pwfxSrc->wBitsPerSample, adsi->pwfxSrc->cbSize);
    TRACE("dst [wFormatTag=%u, nChannels=%u, nSamplesPerSec=%lu, nAvgBytesPerSec=%lu, nBlockAlign=%u, wBitsPerSample=%u, cbSize=%u]\n",
          adsi->pwfxDst->wFormatTag, adsi->pwfxDst->nChannels, adsi->pwfxDst->nSamplesPerSec, adsi->pwfxDst->nAvgBytesPerSec,
          adsi->pwfxDst->nBlockAlign, adsi->pwfxDst->wBitsPerSample, adsi->pwfxDst->cbSize);

    if (adsh->fdwConvert &
	~(ACM_STREAMCONVERTF_BLOCKALIGN|
	  ACM_STREAMCONVERTF_END|
	  ACM_STREAMCONVERTF_START)) {
	FIXME("Unsupported fdwConvert (%08lx), 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) &&
	(adsi->fdwDriver & PCM_RESAMPLE)) {
	PCM_Reset(apd, adsi->pwfxSrc->wBitsPerSample);
    }

    /* do the job */
    if (adsi->fdwDriver & PCM_RESAMPLE) {
	DWORD	nsrc2 = nsrc;
	DWORD	ndst2 = ndst;

	apd->cvt.cvtChangeRate(apd, adsh->pbSrc, &nsrc2, adsh->pbDst, &ndst2);
	nsrc -= nsrc2;
	ndst -= ndst2;
    } else {
	if (nsrc < ndst) ndst = nsrc; else nsrc = ndst;

	/* nsrc is now equal to ndst */
	apd->cvt.cvtKeepRate(adsh->pbSrc, nsrc, adsh->pbDst);
    }

    adsh->cbSrcLengthUsed = nsrc * adsi->pwfxSrc->nBlockAlign;
    adsh->cbDstLengthUsed = ndst * adsi->pwfxDst->nBlockAlign;

    return MMSYSERR_NOERROR;
}

/**************************************************************************
 * 			DriverProc (MSACM32.@)
 */
LRESULT CALLBACK	PCM_DriverProc(DWORD dwDevID, HDRVR hDriv, UINT wMsg,
				       LPARAM dwParam1, LPARAM dwParam2)
{
    TRACE("(%08lx %08lx %u %08lx %08lx);\n",
	  dwDevID, (DWORD)hDriv, wMsg, dwParam1, dwParam2);

    switch (wMsg) {
    case DRV_LOAD:		return 1;
    case DRV_FREE:		return 1;
    case DRV_OPEN:		return PCM_drvOpen((LPSTR)dwParam1, (PACMDRVOPENDESCW)dwParam2);
    case DRV_CLOSE:		return PCM_drvClose(dwDevID);
    case DRV_ENABLE:		return 1;
    case DRV_DISABLE:		return 1;
    case DRV_QUERYCONFIGURE:	return 1;
    case DRV_CONFIGURE:		MessageBoxA(0, "MSACM PCM 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 PCM_DriverDetails((PACMDRIVERDETAILSW)dwParam1);

    case ACMDM_FORMATTAG_DETAILS:
	return PCM_FormatTagDetails((PACMFORMATTAGDETAILSW)dwParam1, dwParam2);

    case ACMDM_FORMAT_DETAILS:
	return PCM_FormatDetails((PACMFORMATDETAILSW)dwParam1, dwParam2);

    case ACMDM_FORMAT_SUGGEST:
	return PCM_FormatSuggest((PACMDRVFORMATSUGGEST)dwParam1);

    case ACMDM_STREAM_OPEN:
	return PCM_StreamOpen((PACMDRVSTREAMINSTANCE)dwParam1);

    case ACMDM_STREAM_CLOSE:
	return PCM_StreamClose((PACMDRVSTREAMINSTANCE)dwParam1);

    case ACMDM_STREAM_SIZE:
	return PCM_StreamSize((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMSIZE)dwParam2);

    case ACMDM_STREAM_CONVERT:
	return PCM_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 */
    case ACMDM_STREAM_PREPARE:
    case ACMDM_STREAM_UNPREPARE:
	/* nothing special to do here... so don't do anything */
	return MMSYSERR_NOTSUPPORTED;

    default:
	return DefDriverProc(dwDevID, hDriv, wMsg, dwParam1, dwParam2);
    }
    return 0;
}