pa_converters.c

一个开源的sip源代码

        dest[1] = 0;
        dest[2] = 0;
#endif

        src += sourceStride;
        dest += destinationStride * 3;
    }
}

/* -------------------------------------------------------------------------- */

static void Int8_To_Int16(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    signed char *src = (signed char*)sourceBuffer;
    PaInt16 *dest =  (PaInt16*)destinationBuffer;
    (void)ditherGenerator; /* unused parameter */

    while( count-- )
    {
        (*dest) = (PaInt16)((*src) << 8);

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void Int8_To_UInt8(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    signed char *src = (signed char*)sourceBuffer;
    unsigned char *dest =  (unsigned char*)destinationBuffer;
    (void)ditherGenerator; /* unused parameter */

    while( count-- )
    {
        (*dest) = (unsigned char)(*src + 128);

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void UInt8_To_Float32(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    unsigned char *src = (unsigned char*)sourceBuffer;
    float *dest =  (float*)destinationBuffer;
    (void)ditherGenerator; /* unused parameter */

    while( count-- )
    {
        float samp = (*src - 128) * const_1_div_128_;
        *dest = samp;

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void UInt8_To_Int32(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    unsigned char *src = (unsigned char*)sourceBuffer;
    PaInt32 *dest = (PaInt32*)destinationBuffer;
    (void)ditherGenerator; /* unused parameter */

    while( count-- )
    {
		(*dest) = (*src - 128) << 24;

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void UInt8_To_Int24(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
	unsigned char *src  = (unsigned char*)sourceBuffer;
    unsigned char *dest = (unsigned char*)destinationBuffer;
    (void) ditherGenerator; /* unused parameters */
    
	while( count-- )
    {

#if defined(PA_LITTLE_ENDIAN)
        dest[0] = 0;
        dest[1] = 0;
        dest[2] = (unsigned char)(*src - 128);
#elif defined(PA_BIG_ENDIAN)
        dest[0] = (unsigned char)(*src - 128);
        dest[1] = 0;
        dest[2] = 0;
#endif
		
        src += sourceStride;
        dest += destinationStride * 3;    
	}
}

/* -------------------------------------------------------------------------- */

static void UInt8_To_Int16(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    unsigned char *src = (unsigned char*)sourceBuffer;
    PaInt16 *dest =  (PaInt16*)destinationBuffer;
    (void)ditherGenerator; /* unused parameter */

    while( count-- )
    {
        (*dest) = (PaInt16)((*src - 128) << 8);

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void UInt8_To_Int8(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    unsigned char *src = (unsigned char*)sourceBuffer;
    signed char  *dest = (signed char*)destinationBuffer;
    (void)ditherGenerator; /* unused parameter */

    while( count-- )
    {
        (*dest) = (signed char)(*src - 128);

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void Copy_8_To_8(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    unsigned char *src = (unsigned char*)sourceBuffer;
    unsigned char *dest = (unsigned char*)destinationBuffer;
                                                      
    (void) ditherGenerator; /* unused parameter */

    while( count-- )
    {
        *dest = *src;

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void Copy_16_To_16(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    PaUint16 *src = (PaUint16 *)sourceBuffer;
    PaUint16 *dest = (PaUint16 *)destinationBuffer;
                                                        
    (void) ditherGenerator; /* unused parameter */
    
    while( count-- )
    {
        *dest = *src;

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

static void Copy_24_To_24(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    unsigned char *src = (unsigned char*)sourceBuffer;
    unsigned char *dest = (unsigned char*)destinationBuffer;

    (void) ditherGenerator; /* unused parameter */
    
    while( count-- )
    {
        dest[0] = src[0];
        dest[1] = src[1];
        dest[2] = src[2];

        src += sourceStride * 3;
        dest += destinationStride * 3;
    }
}

/* -------------------------------------------------------------------------- */

static void Copy_32_To_32(
    void *destinationBuffer, signed int destinationStride,
    void *sourceBuffer, signed int sourceStride,
    unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
    PaUint32 *dest = (PaUint32 *)destinationBuffer;
    PaUint32 *src = (PaUint32 *)sourceBuffer;

    (void) ditherGenerator; /* unused parameter */
    
    while( count-- )
    {
        *dest = *src;

        src += sourceStride;
        dest += destinationStride;
    }
}

/* -------------------------------------------------------------------------- */

PaUtilConverterTable paConverters = {
    Float32_To_Int32,              /* PaUtilConverter *Float32_To_Int32; */
    Float32_To_Int32_Dither,       /* PaUtilConverter *Float32_To_Int32_Dither; */
    Float32_To_Int32_Clip,         /* PaUtilConverter *Float32_To_Int32_Clip; */
    Float32_To_Int32_DitherClip,   /* PaUtilConverter *Float32_To_Int32_DitherClip; */

    Float32_To_Int24,              /* PaUtilConverter *Float32_To_Int24; */
    Float32_To_Int24_Dither,       /* PaUtilConverter *Float32_To_Int24_Dither; */
    Float32_To_Int24_Clip,         /* PaUtilConverter *Float32_To_Int24_Clip; */
    Float32_To_Int24_DitherClip,   /* PaUtilConverter *Float32_To_Int24_DitherClip; */
    
    Float32_To_Int16,              /* PaUtilConverter *Float32_To_Int16; */
    Float32_To_Int16_Dither,       /* PaUtilConverter *Float32_To_Int16_Dither; */
    Float32_To_Int16_Clip,         /* PaUtilConverter *Float32_To_Int16_Clip; */
    Float32_To_Int16_DitherClip,   /* PaUtilConverter *Float32_To_Int16_DitherClip; */

    Float32_To_Int8,               /* PaUtilConverter *Float32_To_Int8; */
    Float32_To_Int8_Dither,        /* PaUtilConverter *Float32_To_Int8_Dither; */
    Float32_To_Int8_Clip,          /* PaUtilConverter *Float32_To_Int8_Clip; */
    Float32_To_Int8_DitherClip,    /* PaUtilConverter *Float32_To_Int8_DitherClip; */

    Float32_To_UInt8,              /* PaUtilConverter *Float32_To_UInt8; */
    Float32_To_UInt8_Dither,       /* PaUtilConverter *Float32_To_UInt8_Dither; */
    Float32_To_UInt8_Clip,         /* PaUtilConverter *Float32_To_UInt8_Clip; */
    Float32_To_UInt8_DitherClip,   /* PaUtilConverter *Float32_To_UInt8_DitherClip; */

    Int32_To_Float32,              /* PaUtilConverter *Int32_To_Float32; */
    Int32_To_Int24,                /* PaUtilConverter *Int32_To_Int24; */
    Int32_To_Int24_Dither,         /* PaUtilConverter *Int32_To_Int24_Dither; */
    Int32_To_Int16,                /* PaUtilConverter *Int32_To_Int16; */
    Int32_To_Int16_Dither,         /* PaUtilConverter *Int32_To_Int16_Dither; */
    Int32_To_Int8,                 /* PaUtilConverter *Int32_To_Int8; */
    Int32_To_Int8_Dither,          /* PaUtilConverter *Int32_To_Int8_Dither; */
    Int32_To_UInt8,                /* PaUtilConverter *Int32_To_UInt8; */
    Int32_To_UInt8_Dither,         /* PaUtilConverter *Int32_To_UInt8_Dither; */

    Int24_To_Float32,              /* PaUtilConverter *Int24_To_Float32; */
    Int24_To_Int32,                /* PaUtilConverter *Int24_To_Int32; */
    Int24_To_Int16,                /* PaUtilConverter *Int24_To_Int16; */
    Int24_To_Int16_Dither,         /* PaUtilConverter *Int24_To_Int16_Dither; */
    Int24_To_Int8,                 /* PaUtilConverter *Int24_To_Int8; */
    Int24_To_Int8_Dither,          /* PaUtilConverter *Int24_To_Int8_Dither; */
    Int24_To_UInt8,                /* PaUtilConverter *Int24_To_UInt8; */
    Int24_To_UInt8_Dither,         /* PaUtilConverter *Int24_To_UInt8_Dither; */

    Int16_To_Float32,              /* PaUtilConverter *Int16_To_Float32; */
    Int16_To_Int32,                /* PaUtilConverter *Int16_To_Int32; */
    Int16_To_Int24,                /* PaUtilConverter *Int16_To_Int24; */
    Int16_To_Int8,                 /* PaUtilConverter *Int16_To_Int8; */
    Int16_To_Int8_Dither,          /* PaUtilConverter *Int16_To_Int8_Dither; */
    Int16_To_UInt8,                /* PaUtilConverter *Int16_To_UInt8; */
    Int16_To_UInt8_Dither,         /* PaUtilConverter *Int16_To_UInt8_Dither; */

    Int8_To_Float32,               /* PaUtilConverter *Int8_To_Float32; */
    Int8_To_Int32,                 /* PaUtilConverter *Int8_To_Int32; */
    Int8_To_Int24,                 /* PaUtilConverter *Int8_To_Int24 */
    Int8_To_Int16,                 /* PaUtilConverter *Int8_To_Int16; */
    Int8_To_UInt8,                 /* PaUtilConverter *Int8_To_UInt8; */

    UInt8_To_Float32,              /* PaUtilConverter *UInt8_To_Float32; */
    UInt8_To_Int32,                /* PaUtilConverter *UInt8_To_Int32; */
    UInt8_To_Int24,                /* PaUtilConverter *UInt8_To_Int24; */
    UInt8_To_Int16,                /* PaUtilConverter *UInt8_To_Int16; */
    UInt8_To_Int8,                 /* PaUtilConverter *UInt8_To_Int8; */

    Copy_8_To_8,                   /* PaUtilConverter *Copy_8_To_8; */
    Copy_16_To_16,                 /* PaUtilConverter *Copy_16_To_16; */
    Copy_24_To_24,                 /* PaUtilConverter *Copy_24_To_24; */
    Copy_32_To_32                  /* PaUtilConverter *Copy_32_To_32; */
};

/* -------------------------------------------------------------------------- */

#endif /* PA_NO_STANDARD_CONVERTERS */

/* -------------------------------------------------------------------------- */

PaUtilZeroer* PaUtil_SelectZeroer( PaSampleFormat destinationFormat )
{
    switch( destinationFormat & ~paNonInterleaved ){
    case paFloat32:
        return paZeroers.Zero32;
    case paInt32:
        return paZeroers.Zero32;
    case paInt24:
        return paZeroers.Zero24;
    case paInt16:
        return paZeroers.Zero16;
    case paInt8:
        return paZeroers.Zero8;
    case paUInt8:
        return paZeroers.ZeroU8;
    default: return 0;
    }
}

/* -------------------------------------------------------------------------- */

#ifdef PA_NO_STANDARD_ZEROERS

/* -------------------------------------------------------------------------- */

PaUtilZeroerTable paZeroers = {
    0,  /* PaUtilZeroer *ZeroU8; */
    0,  /* PaUtilZeroer *Zero8; */
    0,  /* PaUtilZeroer *Zero16; */
    0,  /* PaUtilZeroer *Zero24; */
    0,  /* PaUtilZeroer *Zero32; */
};

/* -------------------------------------------------------------------------- */

#else /* PA_NO_STANDARD_ZEROERS is not defined */

/* -------------------------------------------------------------------------- */

static void ZeroU8( void *destinationBuffer, signed int destinationStride,
        unsigned int count )
{
    unsigned