src/hardware/snd_pc98/sound/getsnd/getsmix.c

#include    "np2glue.h"
//#include      "compiler.h"
#include        "getsnd.h"


#define DNBASEBITS      12
#define DNMIXBASE       (1 << DNBASEBITS)

#define UPBASEBITS      12
#define UPMIXBASE       (1 << UPBASEBITS)


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#define MIX_INPUTBIT    8
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    1
#define FUNC_NOR                m8m16nr
#define FUNC_DOWN               m8m16dn
#define FUNC_UP                 m8m16up
#include "getsndmn.mcr"

#define MIX_INPUTBIT    8
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    2
#define FUNC_NOR                s8m16nr
#define FUNC_DOWN               s8m16dn
#define FUNC_UP                 s8m16up
#include "getsndmn.mcr"

#define MIX_INPUTBIT    16
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    1
#define FUNC_NOR                m16m16nr
#define FUNC_DOWN               m16m16dn
#define FUNC_UP                 m16m16up
#include "getsndmn.mcr"

#define MIX_INPUTBIT    16
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    2
#define FUNC_NOR                s16m16nr
#define FUNC_DOWN               s16m16dn
#define FUNC_UP                 s16m16up
#include "getsndmn.mcr"


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#define MIX_INPUTBIT    8
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    1
#define FUNC_NOR                m8s16nr
#define FUNC_DOWN               m8s16dn
#define FUNC_UP                 m8s16up
#include "getsndst.mcr"

#define MIX_INPUTBIT    8
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    2
#define FUNC_NOR                s8s16nr
#define FUNC_DOWN               s8s16dn
#define FUNC_UP                 s8s16up
#include "getsndst.mcr"

#define MIX_INPUTBIT    16
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    1
#define FUNC_NOR                m16s16nr
#define FUNC_DOWN               m16s16dn
#define FUNC_UP                 m16s16up
#include "getsndst.mcr"

#define MIX_INPUTBIT    16
#define MIX_OUTPUTBIT   16
#define MIX_CHANNELS    2
#define FUNC_NOR                s16s16nr
#define FUNC_DOWN               s16s16dn
#define FUNC_UP                 s16s16up
#include "getsndst.mcr"


static const GSCNV cnvfunc[] = {
                        (GSCNV)m8m16nr,         (GSCNV)m8m16dn,         (GSCNV)m8m16up,
                        (GSCNV)s8m16nr,         (GSCNV)s8m16dn,         (GSCNV)s8m16up,
                        (GSCNV)m16m16nr,        (GSCNV)m16m16dn,        (GSCNV)m16m16up,
                        (GSCNV)s16m16nr,        (GSCNV)s16m16dn,        (GSCNV)s16m16up,

                        (GSCNV)m8s16nr,         (GSCNV)m8s16dn,         (GSCNV)m8s16up,
                        (GSCNV)s8s16nr,         (GSCNV)s8s16dn,         (GSCNV)s8s16up,
                        (GSCNV)m16s16nr,        (GSCNV)m16s16dn,        (GSCNV)m16s16up,
                        (GSCNV)s16s16nr,        (GSCNV)s16s16dn,        (GSCNV)s16s16up};


BOOL getsnd_setmixproc(GETSND snd, UINT samprate, UINT channles) {

        int             funcnum;

        if ((snd->samplingrate < 8000) || (snd->samplingrate > 96000)) {
                goto gssmp_err;
        }
        if ((samprate < 8000) || (samprate > 96000)) {
                goto gssmp_err;
        }

        funcnum = 0;
        if (snd->channels == 1) {
        }
        else if (snd->channels == 2) {
                funcnum |= 1;
        }
        else {
                goto gssmp_err;
        }

        if (snd->bit == 8) {
        }
        else if (snd->bit == 16) {
                funcnum |= 2;
        }
        else {
                goto gssmp_err;
        }

        if (channles == 1) {
        }
        else if (channles == 2) {
                funcnum |= 4;
        }
        else {
                goto gssmp_err;
        }

        funcnum *= 3;

        if (snd->samplingrate > samprate) {
                snd->mrate = (DNMIXBASE * samprate) / snd->samplingrate;
                snd->rem = DNMIXBASE;
                funcnum += 1;
        }
        else if (snd->samplingrate < samprate) {
                snd->mrate = (UPMIXBASE * samprate) / snd->samplingrate;
                funcnum += 2;
        }
        snd->cnv = cnvfunc[funcnum];
        return(SUCCESS);

gssmp_err:
        return(FAILURE);
}