pcm_tablegen.h File Reference

#include <stdint.h>
#include "libavutil/attributes.h"

Go to the source code of this file.

Macros
#define	SIGN_BIT   (0x80) /* Sign bit for a A-law byte. */
#define	QUANT_MASK   (0xf) /* Quantization field mask. */
#define	NSEGS   (8) /* Number of A-law segments. */
#define	SEG_SHIFT   (4) /* Left shift for segment number. */
#define	SEG_MASK   (0x70) /* Segment field mask. */
#define	BIAS   (0x84) /* Bias for linear code. */

Functions
static av_cold int	alaw2linear (unsigned char a_val)
static av_cold int	ulaw2linear (unsigned char u_val)
static av_cold void	build_xlaw_table (uint8_t *linear_to_xlaw, int(*xlaw2linear)(unsigned char), int mask)
static void	pcm_alaw_tableinit (void)
static void	pcm_ulaw_tableinit (void)

Variables
static uint8_t	linear_to_alaw [16384]
static uint8_t	linear_to_ulaw [16384]

Macro Definition Documentation

SIGN_BIT

#define SIGN_BIT   (0x80) /* Sign bit for a A-law byte. */

Definition at line 31 of file pcm_tablegen.h.

Referenced by alaw2linear(), and ulaw2linear().

QUANT_MASK

#define QUANT_MASK   (0xf) /* Quantization field mask. */

Definition at line 32 of file pcm_tablegen.h.

Referenced by alaw2linear(), and ulaw2linear().

NSEGS

#define NSEGS   (8) /* Number of A-law segments. */

Definition at line 33 of file pcm_tablegen.h.

SEG_SHIFT

#define SEG_SHIFT   (4) /* Left shift for segment number. */

Definition at line 34 of file pcm_tablegen.h.

Referenced by alaw2linear(), and ulaw2linear().

SEG_MASK

#define SEG_MASK   (0x70) /* Segment field mask. */

Definition at line 35 of file pcm_tablegen.h.

Referenced by alaw2linear().

BIAS

#define BIAS   (0x84) /* Bias for linear code. */

Definition at line 37 of file pcm_tablegen.h.

Referenced by ulaw2linear().

Function Documentation

alaw2linear()

static av_cold int alaw2linear ( unsigned char  a_val )

static

Definition at line 40 of file pcm_tablegen.h.

Referenced by pcm_alaw_tableinit(), and pcm_decode_init().

ulaw2linear()

static av_cold int ulaw2linear ( unsigned char  u_val )

static

Definition at line 55 of file pcm_tablegen.h.

Referenced by pcm_decode_init(), and pcm_ulaw_tableinit().

build_xlaw_table()

static av_cold void build_xlaw_table ( uint8_t *  linear_to_xlaw, int(*)(unsigned char)  xlaw2linear, int  mask  )

static

Definition at line 81 of file pcm_tablegen.h.

Referenced by pcm_alaw_tableinit(), and pcm_ulaw_tableinit().

pcm_alaw_tableinit()

static void pcm_alaw_tableinit ( void  )

static

Definition at line 105 of file pcm_tablegen.h.

Referenced by main(), and pcm_encode_init().

pcm_ulaw_tableinit()

static void pcm_ulaw_tableinit ( void  )

static

Definition at line 110 of file pcm_tablegen.h.

Referenced by main(), and pcm_encode_init().

Variable Documentation

linear_to_alaw

uint8_t linear_to_alaw[16384]

static

Definition at line 78 of file pcm_tablegen.h.

Referenced by main(), pcm_alaw_tableinit(), and pcm_encode_frame().

linear_to_ulaw

uint8_t linear_to_ulaw[16384]

static

Definition at line 79 of file pcm_tablegen.h.

Referenced by main(), pcm_encode_frame(), and pcm_ulaw_tableinit().