g726.c File Reference

#include <limits.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "put_bits.h"

Include dependency graph for g726.c:

Go to the source code of this file.

Data Structures
struct	Float11
	G.726 11bit float. More...
struct	G726Tables
struct	G726Context

Typedefs
typedef struct Float11	Float11
	G.726 11bit float. More...
typedef struct G726Tables	G726Tables
typedef struct G726Context	G726Context

Functions
static Float11 *	i2f (int i, Float11 *f)
static int16_t	mult (Float11 *f1, Float11 *f2)
static int	sgn (int value)
static uint8_t	quant (G726Context *c, int d)
	Para 4.2.2 page 18: Adaptive quantizer. More...
static int16_t	inverse_quant (G726Context *c, int i)
	Para 4.2.3 page 22: Inverse adaptive quantizer. More...
static int16_t	g726_decode (G726Context *c, int I)
static av_cold int	g726_reset (G726Context *c)

Variables
static const int	quant_tbl16 []
	16kbit/s 2bits per sample More...
static const int16_t	iquant_tbl16 []
static const int16_t	W_tbl16 []
static const uint8_t	F_tbl16 []
static const int	quant_tbl24 []
	24kbit/s 3bits per sample More...
static const int16_t	iquant_tbl24 []
static const int16_t	W_tbl24 []
static const uint8_t	F_tbl24 []
static const int	quant_tbl32 []
	32kbit/s 4bits per sample More...
static const int16_t	iquant_tbl32 []
static const int16_t	W_tbl32 []
static const uint8_t	F_tbl32 []
static const int	quant_tbl40 []
	40kbit/s 5bits per sample More...
static const int16_t	iquant_tbl40 []
static const int16_t	W_tbl40 []
static const uint8_t	F_tbl40 []
static const G726Tables	G726Tables_pool []

Typedef Documentation

typedef struct Float11 Float11

G.726 11bit float.

G.726 Standard uses rather odd 11bit floating point arithmentic for numerous occasions. It's a mystery to me why they did it this way instead of simply using 32bit integer arithmetic.

typedef struct G726Context G726Context

typedef struct G726Tables G726Tables

Function Documentation

static int16_t g726_decode ( G726Context *  c, int  I  )

static

Definition at line 193 of file g726.c.

Referenced by g726_reset().

static av_cold int g726_reset ( G726Context *  c )

static

Definition at line 275 of file g726.c.

static Float11* i2f ( int  i, Float11 *  f  )

inlinestatic

Definition at line 46 of file g726.c.

Referenced by g726_decode().

static int16_t inverse_quant ( G726Context *  c, int  i  )

inlinestatic

Para 4.2.3 page 22: Inverse adaptive quantizer.

Definition at line 183 of file g726.c.

Referenced by g726_decode().

static int16_t mult ( Float11 *  f1, Float11 *  f2  )

inlinestatic

Definition at line 56 of file g726.c.

Referenced by encode_block(), encode_frame(), g726_decode(), select_palette(), and wma_decode_block().

static uint8_t quant ( G726Context *  c, int  d  )

inlinestatic

Para 4.2.2 page 18: Adaptive quantizer.

Definition at line 157 of file g726.c.

Referenced by g726_reset().

static int sgn ( int  value )

inlinestatic

Definition at line 66 of file g726.c.

Referenced by g726_decode().

Variable Documentation

const uint8_t F_tbl16[]

static

Initial value:

=
           { 0, 7, 7, 0 }

Definition at line 107 of file g726.c.

const uint8_t F_tbl24[]

static

Initial value:

=
           { 0, 1, 2, 7, 7, 2, 1, 0 }

Definition at line 116 of file g726.c.

const uint8_t F_tbl32[]

static

Initial value:

=
           { 0, 0, 0, 1, 1, 1, 3, 7, 7, 3, 1, 1, 1, 0, 0, 0 }

Definition at line 127 of file g726.c.

const uint8_t F_tbl40[]

static

Initial value:

=
           { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 6,
             6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }

Definition at line 143 of file g726.c.

const G726Tables G726Tables_pool[]

static

Initial value:

=
           {{ quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 },
            { quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 },
            { quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 },
            { quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }}

Definition at line 147 of file g726.c.

const int16_t iquant_tbl16[]

static

Initial value:

=
           { 116, 365, 365, 116 }

Definition at line 103 of file g726.c.

const int16_t iquant_tbl24[]

static

Initial value:

=
           { INT16_MIN, 135, 273, 373, 373, 273, 135, INT16_MIN }

Definition at line 112 of file g726.c.

const int16_t iquant_tbl32[]

static

Initial value:

=
         { INT16_MIN,   4, 135, 213, 273, 323, 373, 425,
                 425, 373, 323, 273, 213, 135,   4, INT16_MIN }

Definition at line 121 of file g726.c.

const int16_t iquant_tbl40[]

static

Initial value:

=
         { INT16_MIN, -66,  28, 104, 169, 224, 274, 318,
                 358, 395, 429, 459, 488, 514, 539, 566,
                 566, 539, 514, 488, 459, 429, 395, 358,
                 318, 274, 224, 169, 104,  28, -66, INT16_MIN }

Definition at line 133 of file g726.c.

const int quant_tbl16[]

static

Initial value:

=
           { 260, INT_MAX }

16kbit/s 2bits per sample

Definition at line 101 of file g726.c.

const int quant_tbl24[]

static

Initial value:

=
           {  7, 217, 330, INT_MAX }

24kbit/s 3bits per sample

Definition at line 110 of file g726.c.

const int quant_tbl32[]

static

Initial value:

=
           { -125,  79, 177, 245, 299, 348, 399, INT_MAX }

32kbit/s 4bits per sample

Definition at line 119 of file g726.c.

const int quant_tbl40[]

static

Initial value:

=
           { -122, -16,  67, 138, 197, 249, 297, 338,
              377, 412, 444, 474, 501, 527, 552, INT_MAX }

40kbit/s 5bits per sample

Definition at line 130 of file g726.c.

const int16_t W_tbl16[]

static

Initial value:

=
           { -22, 439, 439, -22 }

Definition at line 105 of file g726.c.

const int16_t W_tbl24[]

static

Initial value:

=
           { -4,  30, 137, 582, 582, 137,  30, -4 }

Definition at line 114 of file g726.c.

const int16_t W_tbl32[]

static

Initial value:

=
           { -12,  18,  41,  64, 112, 198, 355, 1122,
            1122, 355, 198, 112,  64,  41,  18, -12}

Definition at line 124 of file g726.c.

const int16_t W_tbl40[]

static

Initial value:

=
           {   14,  14,  24,  39,  40,  41,   58,  100,
              141, 179, 219, 280, 358, 440,  529,  696,
              696, 529, 440, 358, 280, 219,  179,  141,
              100,  58,  41,  40,  39,  24,   14,   14 }

Definition at line 138 of file g726.c.