hvirtual/libmpeg3/audio/bit_allocation.c File Reference

#include "mpeg3audio.h"
#include <string.h>

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Functions

static int logadd (int a, int b)
int mpeg3audio_ac3_calc_lowcomp (int a, int b0, int b1, int bin)
void mpeg3audio_ac3_ba_compute_psd (int start, int end, short exps[], short psd[], short bndpsd[])
void mpeg3audio_ac3_ba_compute_excitation (mpeg3audio_t *audio, int start, int end, int fgain, int fastleak, int slowleak, int is_lfe, short bndpsd[], short excite[])
void mpeg3audio_ac3_ba_compute_mask (mpeg3audio_t *audio, int start, int end, int fscod, int deltbae, int deltnseg, short deltoffst[], short deltba[], short deltlen[], short excite[], short mask[])
void mpeg3audio_ac3_ba_compute_bap (mpeg3audio_t *audio, int start, int end, int snroffset, short psd[], short mask[], short bap[])
int mpeg3audio_ac3_bit_allocate (mpeg3audio_t *audio, unsigned int fscod, mpeg3_ac3bsi_t *bsi, mpeg3_ac3audblk_t *audblk)

Variables

static short mpeg3_slowdec [] = { 0x0f, 0x11, 0x13, 0x15 }
static short mpeg3_fastdec [] = { 0x3f, 0x53, 0x67, 0x7b }
static short mpeg3_slowgain [] = { 0x540, 0x4d8, 0x478, 0x410 }
static short mpeg3_dbpbtab [] = { 0x000, 0x700, 0x900, 0xb00 }
static unsigned short mpeg3_floortab [] = { 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800 }
static short mpeg3_fastgain [] = { 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400 }
static short mpeg3_bndtab []
static short mpeg3_bndsz []
static short mpeg3_masktab []
static short mpeg3_latab []
static short mpeg3_hth [][50]
static short mpeg3_baptab []

Function Documentation

static int logadd ( int  a,
int  b 
) [static]

Definition at line 157 of file bit_allocation.c.

References c, and mpeg3_latab.

Referenced by mpeg3audio_ac3_ba_compute_psd().

void mpeg3audio_ac3_ba_compute_bap ( mpeg3audio_t *  audio,
int  start,
int  end,
int  snroffset,
short  psd[],
short  mask[],
short  bap[] 
)

Definition at line 362 of file bit_allocation.c.

References mpeg3_baptab, mpeg3_bndsz, mpeg3_bndtab, and mpeg3_masktab.

Referenced by mpeg3audio_ac3_bit_allocate().

void mpeg3audio_ac3_ba_compute_excitation ( mpeg3audio_t *  audio,
int  start,
int  end,
int  fgain,
int  fastleak,
int  slowleak,
int  is_lfe,
short  bndpsd[],
short  excite[] 
)

Definition at line 230 of file bit_allocation.c.

References mpeg3_masktab, and mpeg3audio_ac3_calc_lowcomp().

Referenced by mpeg3audio_ac3_bit_allocate().

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void mpeg3audio_ac3_ba_compute_mask ( mpeg3audio_t *  audio,
int  start,
int  end,
int  fscod,
int  deltbae,
int  deltnseg,
short  deltoffst[],
short  deltba[],
short  deltlen[],
short  excite[],
short  mask[] 
)

Definition at line 304 of file bit_allocation.c.

References DELTA_BIT_NEW, DELTA_BIT_REUSE, mpeg3_hth, and mpeg3_masktab.

Referenced by mpeg3audio_ac3_bit_allocate().

void mpeg3audio_ac3_ba_compute_psd ( int  start,
int  end,
short  exps[],
short  psd[],
short  bndpsd[] 
)

Definition at line 195 of file bit_allocation.c.

References logadd(), mpeg3_bndsz, mpeg3_bndtab, and mpeg3_masktab.

Referenced by mpeg3audio_ac3_bit_allocate().

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int mpeg3audio_ac3_bit_allocate ( mpeg3audio_t *  audio,
unsigned int  fscod,
mpeg3_ac3bsi_t *  bsi,
mpeg3_ac3audblk_t *  audblk 
)

Definition at line 400 of file bit_allocation.c.

References mpeg3_dbpbtab, mpeg3_fastdec, mpeg3_fastgain, mpeg3_floortab, mpeg3_slowdec, mpeg3_slowgain, mpeg3audio_ac3_ba_compute_bap(), mpeg3audio_ac3_ba_compute_excitation(), mpeg3audio_ac3_ba_compute_mask(), and mpeg3audio_ac3_ba_compute_psd().

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int mpeg3audio_ac3_calc_lowcomp ( int  a,
int  b0,
int  b1,
int  bin 
)

Definition at line 172 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_ba_compute_excitation().

Variable Documentation

short mpeg3_baptab[] [static]

Initial value:

 
{ 
        0,  1,  1,  1,  1,  1,  2,  2,  3,  3,  3,  4,  4,  5,  5,  6,
        6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  8,  9,  9,  9,  9, 10, 
        10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14,
        14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15 
}

Definition at line 148 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_ba_compute_bap().

short mpeg3_bndsz[] [static]

Initial value:

 
{ 
        1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
        1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
        1,  1,  1,  1,  1,  1,  1,  1,  3,  3,
        3,  3,  3,  3,  3,  6,  6,  6,  6,  6,
        6, 12, 12, 12, 12, 24, 24, 24, 24, 24 
}

Definition at line 47 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_ba_compute_bap(), and mpeg3audio_ac3_ba_compute_psd().

short mpeg3_bndtab[] [static]

Initial value:

 
{  
        0,  1,  2,   3,   4,   5,   6,   7,   8,   9, 
        10, 11, 12,  13,  14,  15,  16,  17,  18,  19,
        20, 21, 22,  23,  24,  25,  26,  27,  28,  31,
        34, 37, 40,  43,  46,  49,  55,  61,  67,  73,
        79, 85, 97, 109, 121, 133, 157, 181, 205, 229 
}

Definition at line 38 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_ba_compute_bap(), and mpeg3audio_ac3_ba_compute_psd().

short mpeg3_dbpbtab[] = { 0x000, 0x700, 0x900, 0xb00 } [static]

Definition at line 32 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_bit_allocate().

short mpeg3_fastdec[] = { 0x3f, 0x53, 0x67, 0x7b } [static]

Definition at line 30 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_bit_allocate().

short mpeg3_fastgain[] = { 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400 } [static]

Definition at line 35 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_bit_allocate().

unsigned short mpeg3_floortab[] = { 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800 } [static]

Definition at line 34 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_bit_allocate().

short mpeg3_hth[][50] [static]

Definition at line 114 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_ba_compute_mask().

short mpeg3_latab[] [static]

Definition at line 77 of file bit_allocation.c.

Referenced by logadd().

short mpeg3_masktab[] [static]

Initial value:

 
{ 
        0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
        16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 28, 28, 29,
        29, 29, 30, 30, 30, 31, 31, 31, 32, 32, 32, 33, 33, 33, 34, 34,
        34, 35, 35, 35, 35, 35, 35, 36, 36, 36, 36, 36, 36, 37, 37, 37,
        37, 37, 37, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 40,
        40, 40, 40, 40, 40, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
        41, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 43, 43, 43,
        43, 43, 43, 43, 43, 43, 43, 43, 43, 44, 44, 44, 44, 44, 44, 44,
        44, 44, 44, 44, 44, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45,
        45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 46, 46, 46,
        46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46,
        46, 46, 46, 46, 46, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47,
        47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 48, 48, 48,
        48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
        48, 48, 48, 48, 48, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49,
        49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49,  0,  0,  0 
}

Definition at line 56 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_ba_compute_bap(), mpeg3audio_ac3_ba_compute_excitation(), mpeg3audio_ac3_ba_compute_mask(), and mpeg3audio_ac3_ba_compute_psd().

short mpeg3_slowdec[] = { 0x0f, 0x11, 0x13, 0x15 } [static]

Definition at line 29 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_bit_allocate().

short mpeg3_slowgain[] = { 0x540, 0x4d8, 0x478, 0x410 } [static]

Definition at line 31 of file bit_allocation.c.

Referenced by mpeg3audio_ac3_bit_allocate().

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