msadp32.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

/*
 * MS ADPCM handling
 *
 *      Copyright (C) 2002		Eric Pouech
 *
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <assert.h>
#include <stdarg.h>
#include <string.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"

/* see http://www.pcisys.net/~melanson/codecs/adpcm.txt for the details */

WINE_DEFAULT_DEBUG_CHANNEL(adpcm);

/***********************************************************************
 *           ADPCM_drvOpen
 */
static	DWORD	ADPCM_drvOpen(LPCSTR str)
{
    return 1;
}

/***********************************************************************
 *           ADPCM_drvClose
 */
static	DWORD	ADPCM_drvClose(DWORD dwDevID)
{
    return 1;
}

typedef struct tagAcmAdpcmData
{
    void (*convert)(PACMDRVSTREAMINSTANCE adsi,
		    const unsigned char*, LPDWORD, unsigned char*, LPDWORD);
} AcmAdpcmData;

/* 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 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, 22050}, {2,  8, 22050}, {1, 16, 22050}, {2, 16, 22050},
    {1,  8, 44100}, {2,  8, 44100}, {1, 16, 44100}, {2, 16, 44100},
};

static Format ADPCM_Formats[] =
{
    {1,  4,  8000}, {2,	4,  8000},  {1,  4, 11025}, {2,	 4, 11025},
    {1,  4, 22050}, {2,	4, 22050},  {1,  4, 44100}, {2,	 4, 44100},
};

#define	NUM_PCM_FORMATS		(sizeof(PCM_Formats) / sizeof(PCM_Formats[0]))
#define	NUM_ADPCM_FORMATS	(sizeof(ADPCM_Formats) / sizeof(ADPCM_Formats[0]))

static int MS_Delta[] =
{
    230, 230, 230, 230, 307, 409, 512, 614,
    768, 614, 512, 409, 307, 230, 230, 230
};


static ADPCMCOEFSET MSADPCM_CoeffSet[] =
{
    {256, 0}, {512, -256}, {0, 0}, {192, 64}, {240, 0}, {460, -208}, {392, -232}
};

/***********************************************************************
 *           ADPCM_GetFormatIndex
 */
static	DWORD	ADPCM_GetFormatIndex(WAVEFORMATEX* wfx)
{
    int 	i, hi;
    Format*	fmts;

    switch (wfx->wFormatTag)
    {
    case WAVE_FORMAT_PCM:
	hi = NUM_PCM_FORMATS;
	fmts = PCM_Formats;
	break;
    case WAVE_FORMAT_ADPCM:
	hi = NUM_ADPCM_FORMATS;
	fmts = ADPCM_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)
	    return i;
    }

    return 0xFFFFFFFF;
}

static void     init_wfx_adpcm(ADPCMWAVEFORMAT* awfx)
{
    register WAVEFORMATEX*      pwfx = &awfx->wfx;

    /* we assume wFormatTag, nChannels, nSamplesPerSec and wBitsPerSample
     * have been initialized... */

    if (pwfx->wFormatTag != WAVE_FORMAT_ADPCM) {FIXME("wrong FT\n"); return;}
    if (ADPCM_GetFormatIndex(pwfx) == 0xFFFFFFFF) {FIXME("wrong fmt\n"); return;}

    switch (pwfx->nSamplesPerSec)
    {
    case  8000: pwfx->nBlockAlign = 256;   break;
    case 11025: pwfx->nBlockAlign = 256;   break;
    case 22050: pwfx->nBlockAlign = 512;   break;
    default:
    case 44100: pwfx->nBlockAlign = 1024;  break;
    }
    pwfx->cbSize = 2 * sizeof(WORD) + 7 * sizeof(ADPCMCOEFSET);
    /* 7 is the size of the block head (which contains two samples) */

    awfx->wSamplesPerBlock = (pwfx->nBlockAlign - (7 * pwfx->nChannels)) * (2 / pwfx->nChannels) + 2;
    pwfx->nAvgBytesPerSec = (pwfx->nSamplesPerSec * pwfx->nBlockAlign) / awfx->wSamplesPerBlock;
    awfx->wNumCoef = 7;
    memcpy(awfx->aCoef, MSADPCM_CoeffSet, 7 * sizeof(ADPCMCOEFSET));
}

/***********************************************************************
 *           R16
 *
 * Read a 16 bit sample (correctly handles endianess)
 */
static inline short  R16(const unsigned char* src)
{
    return (short)((unsigned short)src[0] | ((unsigned short)src[1] << 8));
}

/***********************************************************************
 *           W16
 *
 * Write a 16 bit sample (correctly handles endianess)
 */
static inline void  W16(unsigned char* dst, short s)
{
    dst[0] = LOBYTE(s);
    dst[1] = HIBYTE(s);
}

static inline void clamp_sample(int* sample)
{
    if (*sample < -32768) *sample = -32768;
    if (*sample >  32767) *sample =  32767;
}

static inline void process_nibble(unsigned nibble, int* idelta,
                                  int* sample1, int* sample2,
                                  const ADPCMCOEFSET* coeff)
{
    int sample;
    int snibble;

    /* nibble is in fact a signed 4 bit integer => propagate sign if needed */
    snibble = (nibble & 0x08) ? (nibble - 16) : nibble;
    sample = ((*sample1 * coeff->iCoef1) + (*sample2 * coeff->iCoef2)) / 256 +
        snibble * *idelta;
    clamp_sample(&sample);

    *sample2 = *sample1;
    *sample1 = sample;
    *idelta = ((MS_Delta[nibble] * *idelta) / 256);
    if (*idelta < 16) *idelta = 16;
}

static	void cvtSSms16K(PACMDRVSTREAMINSTANCE adsi,
                        const unsigned char* src, LPDWORD nsrc,
                        unsigned char* dst, LPDWORD ndst)
{
    int                 ideltaL, ideltaR;
    int                 sample1L, sample2L;
    int                 sample1R, sample2R;
    ADPCMCOEFSET        coeffL, coeffR;
    int                 nsamp;
    int		        nsamp_blk = ((ADPCMWAVEFORMAT*)adsi->pwfxSrc)->wSamplesPerBlock;
    DWORD	        nblock = min(*nsrc / adsi->pwfxSrc->nBlockAlign,
                                     *ndst / (nsamp_blk * 2 * 2));

    *nsrc = nblock * adsi->pwfxSrc->nBlockAlign;
    *ndst = nblock * nsamp_blk * 2 * 2;

    nsamp_blk -= 2; /* see below for samples from block head */
    for (; nblock > 0; nblock--)
    {
        const unsigned char*    in_src = src;

        assert(*src <= 6);
        coeffL = MSADPCM_CoeffSet[*src++];
        assert(*src <= 6);
        coeffR = MSADPCM_CoeffSet[*src++];

        ideltaL  = R16(src);    src += 2;
        ideltaR  = R16(src);    src += 2;
        sample1L = R16(src);    src += 2;
        sample1R = R16(src);    src += 2;
        sample2L = R16(src);    src += 2;
        sample2R = R16(src);    src += 2;

        /* store samples from block head */
        W16(dst, sample2L);      dst += 2;
        W16(dst, sample2R);      dst += 2;
        W16(dst, sample1L);      dst += 2;
        W16(dst, sample1R);      dst += 2;

        for (nsamp = nsamp_blk; nsamp > 0; nsamp--)
        {
            process_nibble(*src >> 4, &ideltaL, &sample1L, &sample2L, &coeffL);
            W16(dst, sample1L); dst += 2;
            process_nibble(*src++ & 0x0F, &ideltaR, &sample1R, &sample2R, &coeffR);
            W16(dst, sample1R); dst += 2;
        }
        src = in_src + adsi->pwfxSrc->nBlockAlign;
    }
}

static	void cvtMMms16K(PACMDRVSTREAMINSTANCE adsi,
                        const unsigned char* src, LPDWORD nsrc,
                        unsigned char* dst, LPDWORD ndst)
{
    int                 idelta;
    int                 sample1, sample2;
    ADPCMCOEFSET        coeff;
    int                 nsamp;
    int		        nsamp_blk = ((ADPCMWAVEFORMAT*)adsi->pwfxSrc)->wSamplesPerBlock;
    DWORD	        nblock = min(*nsrc / adsi->pwfxSrc->nBlockAlign,
                                     *ndst / (nsamp_blk * 2));

    *nsrc = nblock * adsi->pwfxSrc->nBlockAlign;
    *ndst = nblock * nsamp_blk * 2;

    nsamp_blk -= 2; /* see below for samples from block head */
    for (; nblock > 0; nblock--)
    {
        const unsigned char*    in_src = src;

        assert(*src <= 6);
        coeff = MSADPCM_CoeffSet[*src++];

        idelta =  R16(src);     src += 2;
        sample1 = R16(src);     src += 2;
        sample2 = R16(src);     src += 2;

        /* store samples from block head */
        W16(dst, sample2);      dst += 2;
        W16(dst, sample1);      dst += 2;

        for (nsamp = nsamp_blk; nsamp > 0; nsamp -= 2)
        {
            process_nibble(*src >> 4, &idelta, &sample1, &sample2, &coeff);
            W16(dst, sample1); dst += 2;
            process_nibble(*src++ & 0x0F, &idelta, &sample1, &sample2, &coeff);
            W16(dst, sample1); dst += 2;
        }
        src = in_src + adsi->pwfxSrc->nBlockAlign;
    }
}

#if 0
static	void cvtSS16msK(PACMDRVSTREAMINSTANCE adsi,
                        const unsigned char* src, LPDWORD nsrc,
                        unsigned char* dst, LPDWORD ndst)
{
}

static	void cvtMM16msK(PACMDRVSTREAMINSTANCE adsi,
                        const unsigned char* src, LPDWORD nsrc,
                        unsigned char* dst, LPDWORD ndst)
{
}
#endif

/***********************************************************************
 *           ADPCM_DriverDetails
 *
 */
static	LRESULT ADPCM_DriverDetails(PACMDRIVERDETAILSW 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_CODEC;
    add->cFormatTags = 2; /* PCM, MS ADPCM */
    add->cFilterTags = 0;
    add->hicon = NULL;
    MultiByteToWideChar( CP_ACP, 0, "WINE-MS ADPCM", -1,
                         add->szShortName, sizeof(add->szShortName)/sizeof(WCHAR) );
    MultiByteToWideChar( CP_ACP, 0, "Wine MS ADPCM 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;
}

/***********************************************************************
 *           ADPCM_FormatTagDetails
 *
 */
static	LRESULT	ADPCM_FormatTagDetails(PACMFORMATTAGDETAILSW aftd, DWORD dwQuery)
{
    static WCHAR szPcm[]={'P','C','M',0};
    static WCHAR szMsAdPcm[]={'M','S',' ','A','d','P','C','M',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 = 1; /* WAVE_FORMAT_ADPCM is bigger than PCM */
	    break;
	}
	/* fall thru */
    case ACM_FORMATTAGDETAILSF_FORMATTAG:
	switch (aftd->dwFormatTag)
        {
	case WAVE_FORMAT_PCM:	aftd->dwFormatTagIndex = 0; break;
	case WAVE_FORMAT_ADPCM: aftd->dwFormatTagIndex = 1; break;
	default:		return ACMERR_NOTPOSSIBLE;
	}
	break;
    default:
	WARN("Unsupported query %08lx\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 = NUM_PCM_FORMATS;
        lstrcpyW(aftd->szFormatTag, szPcm);
        break;
    case 1:
	aftd->dwFormatTag = WAVE_FORMAT_ADPCM;
	aftd->cbFormatSize = sizeof(ADPCMWAVEFORMAT) + (7 - 1) * sizeof(ADPCMCOEFSET);
	aftd->cStandardFormats = NUM_ADPCM_FORMATS;
        lstrcpyW(aftd->szFormatTag, szMsAdPcm);
	break;
    }