wmafixed.h File Reference

Include dependency graph for wmafixed.h:

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Defines
#define	PRECISION   16
#define	PRECISION64   16
#define	fixtof64(x)   (float)((float)(x) / (float)(1 << PRECISION64))
#define	ftofix32(x)   ((int32_t)((x) * (float)(1 << PRECISION) + ((x) < 0 ? -0.5 : 0.5)))
#define	itofix64(x)   (IntTo64(x))
#define	itofix32(x)   ((x) << PRECISION)
#define	fixtoi32(x)   ((x) >> PRECISION)
#define	fixtoi64(x)   (IntFrom64(x))
Functions
int64_t	IntTo64 (int x)
int	IntFrom64 (int64_t x)
int32_t	Fixed32From64 (int64_t x)
int64_t	Fixed32To64 (int32_t x)
int64_t	fixmul64byfixed (int64_t x, int32_t y)
int32_t	fixdiv32 (int32_t x, int32_t y)
int64_t	fixdiv64 (int64_t x, int64_t y)
int32_t	fixsqrt32 (int32_t x)
long	fsincos (unsigned long phase, int32_t *cos)
	Implements sin and cos using CORDIC rotation.
static int32_t	fixmul32 (int32_t x, int32_t y)
static int32_t	fixmul32b (int32_t x, int32_t y)
static void	CMUL (int32_t *pre, int32_t *pim, int32_t are, int32_t aim, int32_t bre, int32_t bim)

---

Define Documentation

#define fixtof64

(

x

)

(float)((float)(x) / (float)(1 << PRECISION64))

Referenced by pow_m1_4().

#define fixtoi32

(

x

)

((x) >> PRECISION)

Referenced by wma_decode_block(), and wma_decode_init().

#define fixtoi64

(

x

)

(IntFrom64(x))

Referenced by wma_decode_init().

#define ftofix32

(

x

)

((int32_t)((x) * (float)(1 << PRECISION) + ((x) < 0 ? -0.5 : 0.5)))

Referenced by pow_m1_4().

#define itofix32

(

x

)

((x) << PRECISION)

Referenced by ff_mdct_init(), fft_init_global(), wma_decode_block(), wma_decode_init(), and wma_lsp_to_curve_init().

#define itofix64

(

x

)

(IntTo64(x))

Referenced by wma_decode_init().

#define PRECISION   16

Referenced by fixdiv32(), fixmul32(), and wma_decode_block().

#define PRECISION64   16

Referenced by fixdiv64().

---

Function Documentation

static void CMUL	(	int32_t *	pre,
		int32_t *	pim,
		int32_t	are,
		int32_t	aim,
		int32_t	bre,
		int32_t	bim
	)			[inline, static]

References fixmul32b().

Referenced by ff_imdct_calc(), and fft_calc_unscaled().

int32_t fixdiv32	(	int32_t	x,
		int32_t	y
	)

References PRECISION.

Referenced by fft_init_global(), wma_decode_block(), wma_decode_init(), and wma_lsp_to_curve_init().

int64_t fixdiv64	(	int64_t	x,
		int64_t	y
	)

References PRECISION64.

Referenced by wma_decode_block(), and wma_decode_init().

int32_t Fixed32From64

(

int64_t

x

)

Referenced by wma_decode_block().

int64_t Fixed32To64

(

int32_t

x

)

Referenced by wma_decode_block().

static int32_t fixmul32	(	int32_t	x,
		int32_t	y
	)			[inline, static]

References PRECISION.

Referenced by pow_m1_4(), wma_decode_block(), wma_decode_init(), and wma_lsp_to_curve().

static int32_t fixmul32b	(	int32_t	x,
		int32_t	y
	)			[inline, static]

Referenced by CMUL(), vector_fmul_add_add(), vector_fmul_reverse(), and wma_lsp_to_curve().

int64_t fixmul64byfixed	(	int64_t	x,
		int32_t	y
	)

int32_t fixsqrt32

(

int32_t

x

)

References long(), and STEP.

Referenced by wma_decode_block().

long fsincos	(	unsigned long	phase,
		int32_t *	cos
	)

Implements sin and cos using CORDIC rotation.

Parameters:

	phase	has range from 0 to 0xffffffff, representing 0 and 2*pi respectively.
	cos	return address for cos

Returns:

sin of phase, value is a signed value from LONG_MIN to LONG_MAX, representing -1 and 1 respectively.

Gives at least 24 bits precision (last 2-8 bits or so are probably off)

References atan_table, cordic_circular_gain, and i.

Referenced by ff_mdct_init(), fft_init_global(), wma_decode_init(), and wma_lsp_to_curve_init().

int IntFrom64

(

int64_t

x

)

int64_t IntTo64

(

int

x

)