libSACenc/src/sacenc_huff_tab.h

/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

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 1.    INTRODUCTION
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
general perceptual audio codecs. AAC-ELD is considered the best-performing
full-bandwidth communications codec by independent studies and is widely
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specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including
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Commercially-licensed AAC software libraries, including floating-point versions
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Redistribution and use in source and binary forms, with or without modification,
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Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
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www.iis.fraunhofer.de/amm
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----------------------------------------------------------------------------- */

/*********************** MPEG surround encoder library *************************

   Author(s):   Markus Lohwasser

   Description: SAC-Encoder constant huffman tables

*******************************************************************************/

#ifndef SACENC_HUFF_TAB_H
#define SACENC_HUFF_TAB_H

/* Includes ******************************************************************/
#include "machine_type.h"

/* Defines *******************************************************************/
#define HUFF_PACK(a, b)                                    \
  {                                                        \
    ((((ULONG)a) & 0x00FFFFFF) << 8) | (((ULONG)b) & 0xFF) \
  } /*!< Pack huffman value and length information. */
#define HUFF_VALUE(a)                                                         \
  (((a.packed >> 8) & 0x00FFFFFF)) /*!< Return value from packed table entry. \
                                    */
#define HUFF_LENGTH(a) \
  ((a.packed & 0xFF)) /*!< Return length from packed table entry. */

/* Data Types ****************************************************************/
/**
 * \brief  This struct contains packed huffman entries.
 *
 * The packed entry consist of hffman value and length information.
 *
 *   |---------------------------------|
 *   |         value          | length |
 *   |---------------------------------|
 *   |<------- 31...8 ------->|< 7..0 >|
 */
typedef struct {
  ULONG packed; /*! Packed huffman entry:
                    - lower 8 bit are reservoed for length information
                    - upper 24 bit contains huffman value */
} HUFF_ENTRY;

typedef struct {
  HUFF_ENTRY entry[2][2];
  HUFF_ENTRY escape;

} LAV1_2D;

typedef struct {
  HUFF_ENTRY entry[4][4];
  HUFF_ENTRY escape;

} LAV3_2D;

typedef struct {
  HUFF_ENTRY entry[6][6];
  HUFF_ENTRY escape;

} LAV5_2D;

typedef struct {
  HUFF_ENTRY entry[7][7];
  HUFF_ENTRY escape;

} LAV6_2D;

typedef struct {
  HUFF_ENTRY entry[8][8];
  HUFF_ENTRY escape;

} LAV7_2D;

typedef struct {
  HUFF_ENTRY entry[10][10];
  HUFF_ENTRY escape;

} LAV9_2D;

typedef struct {
  HUFF_ENTRY entry[13][13];
  HUFF_ENTRY escape;

} LAV12_2D;

typedef struct {
  LAV3_2D lav3;
  LAV5_2D lav5;
  LAV7_2D lav7;
  LAV9_2D lav9;

} HUFF_CLD_TAB_2D;

typedef struct {
  LAV1_2D lav1;
  LAV3_2D lav3;
  LAV5_2D lav5;
  LAV7_2D lav7;

} HUFF_ICC_TAB_2D;

typedef struct {
  HUFF_ENTRY h1D[2][31];
  HUFF_CLD_TAB_2D h2D[2][2];

} HUFF_CLD_TABLE;

typedef struct {
  HUFF_ENTRY h1D[2][8];
  HUFF_ICC_TAB_2D h2D[2][2];

} HUFF_ICC_TABLE;

typedef struct {
  HUFF_ENTRY cld[31];
  HUFF_ENTRY icc[8];

} HUFF_PT0_TABLE;

typedef HUFF_ENTRY HUFF_RES_TABLE[5][8];

/* Constants *****************************************************************/
extern const HUFF_CLD_TABLE fdk_sacenc_huffCLDTab;
extern const HUFF_ICC_TABLE fdk_sacenc_huffICCTab;
extern const HUFF_PT0_TABLE fdk_sacenc_huffPart0Tab;

/* Function / Class Declarations *********************************************/

#endif /* SACENC_HUFF_TAB_H */