read_utk.c File Reference

#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include "read_utk.h"

Macros
#define	read_uint32(x)   (unsigned)(((x)[0]<<(8*0)) | ((x)[1]<<(8*1)) | ((x)[2]<<(8*2)) | ((x)[3]<<(8*3)))
#define	read_uint16(x)   (unsigned)(((x)[0]<<(8*0)) | ((x)[1]<<(8*1)))
#define	write_uint16(dest, src)
#define	round(x)   ((x) >= 0 ? (x)+0.5 : (x)-0.5)
#define	clamp(x, low, high)   ((x) < low ? low : (x) > high ? high : (x))
#define	min(x, y)   ((x) < (y) ? (x) : (y))

Functions
static uint8_t	ReadBits (utkcontext_t *ctx, uint8_t bits)
static void	InitUTKParameters (utkcontext_t *ctx)
static void	DecodeFrame (utkcontext_t *ctx)
static void	GenerateExcitation (utkcontext_t *ctx, int Voiced, float *Window, int Interval)
static void	Synthesize (utkcontext_t *ctx, unsigned Sample, unsigned Blocks)
static void	RCtoLPC (const float *__restrict RC, float *__restrict LPC)
int	utk_read_header (utkheader_t *UTKHeader, const uint8_t *Buffer, size_t FileSize)
int	utk_decode (const uint8_t *__restrict InBuffer, uint8_t *__restrict OutBuffer, size_t InSize, size_t Samples)
static void	Synthesize (utkcontext_t *ctx, size_t Sample, size_t Samples)

Variables
static const float	UTKCosine [64]
static const uint8_t	UTKCodebook [512]
static const uint8_t	UTKCodeSkips [29] = {8,7,8,7,2,2,2,3,3,4,4,3,3,5,5,4,4,6,6,5,5,7,7,6,6,8,8,7,7}

Macro Definition Documentation

#define clamp	(		x,
			low,
			high
	)		((x) < low ? low : (x) > high ? high : (x))

#define min	(		x,
			y
	)		((x) < (y) ? (x) : (y))

#define read_uint16

(

x)

(unsigned)(((x)[0]<<(8*0)) | ((x)[1]<<(8*1)))

#define read_uint32

(

x)

(unsigned)(((x)[0]<<(8*0)) | ((x)[1]<<(8*1)) | ((x)[2]<<(8*2)) | ((x)[3]<<(8*3)))

#define round

(

x)

((x) >= 0 ? (x)+0.5 : (x)-0.5)

#define write_uint16	(		dest,
			src
	)

Value:

do {\
    (dest)[0] = ((src)&0x00FF)>>(8*0); \
    (dest)[1] = ((src)&0xFF00)>>(8*1); \
    } while(0)

Function Documentation

static void DecodeFrame ( utkcontext_t *  ctx)

static

static void GenerateExcitation ( utkcontext_t *  ctx, int  Voiced, float *  Window, int  Interval  )

static

static void InitUTKParameters ( utkcontext_t *  ctx)

static

static void RCtoLPC ( const float *__restrict  RC, float *__restrict  LPC  )

static

static uint8_t ReadBits ( utkcontext_t *  ctx, uint8_t  bits  )

static

static void Synthesize ( utkcontext_t *  ctx, unsigned  Sample, unsigned  Blocks  )

static

static void Synthesize ( utkcontext_t *  ctx, size_t  Sample, size_t  Samples  )

static

int utk_decode	(	const uint8_t *__restrict	InBuffer,
		uint8_t *__restrict	OutBuffer,
		size_t	InSize,
		size_t	Samples
	)

int utk_read_header	(	utkheader_t *	UTKHeader,
		const uint8_t *	Buffer,
		size_t	FileSize
	)

Variable Documentation

const uint8_t UTKCodebook[512]

static

const uint8_t UTKCodeSkips[29] = {8,7,8,7,2,2,2,3,3,4,4,3,3,5,5,4,4,6,6,5,5,7,7,6,6,8,8,7,7}

static

const float UTKCosine[64]

static

Initial value:

= {
    0,
    -.99677598476409912109375, -.99032700061798095703125, -.983879029750823974609375, -.977430999279022216796875,
    -.970982015132904052734375, -.964533984661102294921875, -.958085000514984130859375, -.9516370296478271484375,
    -.930754005908966064453125, -.904959976673126220703125, -.879167020320892333984375, -.853372991085052490234375,
    -.827579021453857421875, -.801786005496978759765625, -.775991976261138916015625, -.75019800662994384765625,
    -.724404990673065185546875, -.6986110210418701171875, -.6706349849700927734375, -.61904799938201904296875,
    -.567460000514984130859375, -.515873014926910400390625, -.4642859995365142822265625, -.4126980006694793701171875,
    -.361110985279083251953125, -.309523999691009521484375, -.257937014102935791015625, -.20634900033473968505859375,
    -.1547619998455047607421875, -.10317499935626983642578125, -.05158700048923492431640625,
    0,
    +.05158700048923492431640625, +.10317499935626983642578125, +.1547619998455047607421875, +.20634900033473968505859375,
    +.257937014102935791015625, +.309523999691009521484375, +.361110985279083251953125, +.4126980006694793701171875,
    +.4642859995365142822265625, +.515873014926910400390625, +.567460000514984130859375, +.61904799938201904296875,
    +.6706349849700927734375, +.6986110210418701171875, +.724404990673065185546875, +.75019800662994384765625,
    +.775991976261138916015625, +.801786005496978759765625, +.827579021453857421875, +.853372991085052490234375,
    +.879167020320892333984375, +.904959976673126220703125, +.930754005908966064453125, +.9516370296478271484375,
    +.958085000514984130859375, +.964533984661102294921875, +.970982015132904052734375, +.977430999279022216796875,
    +.983879029750823974609375, +.99032700061798095703125, +.99677598476409912109375
}