libavcodec/g726.c File Reference

#include <limits.h>
#include "avcodec.h"
#include "bitstream.h"

Go to the source code of this file.

Data Structures
struct	Float11
	G.726 11bit float. More...
struct	G726Tables
struct	G726Context
struct	AVG726Context
Functions
static Float11 *	i2f (int16_t 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.
static int16_t	inverse_quant (G726Context *c, int i)
	Para 4.2.3 page 22: Inverse adaptive quantizer.
static int16_t	g726_iterate (G726Context *c, int16_t I)
static int	g726_reset (G726Context *c, int bit_rate)
static int16_t	g726_decode (G726Context *c, int16_t i)
static int	g726_init (AVCodecContext *avctx)
static int	g726_close (AVCodecContext *avctx)
static int	g726_decode_frame (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
Variables
static const int	quant_tbl16 []
	16kbit/s 2bits per sample
static const int	iquant_tbl16 []
static const int	W_tbl16 []
static const int	F_tbl16 []
static const int	quant_tbl24 []
	24kbit/s 3bits per sample
static const int	iquant_tbl24 []
static const int	W_tbl24 []
static const int	F_tbl24 []
static const int	quant_tbl32 []
	32kbit/s 4bits per sample
static const int	iquant_tbl32 []
static const int	W_tbl32 []
static const int	F_tbl32 []
static const int	quant_tbl40 []
	40kbit/s 5bits per sample
static const int	iquant_tbl40 []
static const int	W_tbl40 []
static const int	F_tbl40 []
static const G726Tables	G726Tables_pool []
AVCodec	adpcm_g726_decoder

---

Function Documentation

static int g726_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 349 of file g726.c.

static int16_t g726_decode	(	G726Context *	c,
		int16_t	i
	)			[static]

Definition at line 297 of file g726.c.

Referenced by g726_decode_frame().

static int g726_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 374 of file g726.c.

static int g726_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 322 of file g726.c.

static int16_t g726_iterate	(	G726Context *	c,
		int16_t	I
	)			[inline, static]

Definition at line 186 of file g726.c.

Referenced by g726_decode().

static int g726_reset	(	G726Context *	c,
		int	bit_rate
	)			[static]

Definition at line 269 of file g726.c.

Referenced by g726_init().

static Float11* i2f	(	int16_t	i,
		Float11 *	f
	)			[inline, static]

Definition at line 40 of file g726.c.

Referenced by g726_iterate(), and g726_reset().

static int16_t inverse_quant	(	G726Context *	c,
		int	i
	)			[inline, static]

Para 4.2.3 page 22: Inverse adaptive quantizer.

Definition at line 176 of file g726.c.

Referenced by g726_iterate().

static int16_t mult	(	Float11 *	f1,
		Float11 *	f2
	)			[inline, static]

Definition at line 50 of file g726.c.

Referenced by encode_block(), encode_frame(), g726_iterate(), and wma_decode_block().

static uint8_t quant	(	G726Context *	c,
		int	d
	)			[inline, static]

Para 4.2.2 page 18: Adaptive quantizer.

Definition at line 150 of file g726.c.

static int sgn

(

int

value

)

[inline, static]

Definition at line 60 of file g726.c.

Referenced by g726_iterate().

---

Variable Documentation

AVCodec adpcm_g726_decoder

Initial value:

 {
    "g726",
    CODEC_TYPE_AUDIO,
    CODEC_ID_ADPCM_G726,
    sizeof(AVG726Context),
    g726_init,
    NULL,
    g726_close,
    g726_decode_frame,
}

Definition at line 419 of file g726.c.

const int F_tbl16[] [static]

Initial value:

           { 0, 7, 7, 0 }

Definition at line 100 of file g726.c.

const int F_tbl24[] [static]

Initial value:

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

Definition at line 109 of file g726.c.

const int F_tbl32[] [static]

Initial value:

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

Definition at line 120 of file g726.c.

const int 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 136 of file g726.c.

const G726Tables G726Tables_pool[] [static]

Initial value:

           {{ 2, quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 },
            { 3, quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 },
            { 4, quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 },
            { 5, quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }}

Definition at line 140 of file g726.c.

const int iquant_tbl16[] [static]

Initial value:

           { 116, 365, 365, 116 }

Definition at line 96 of file g726.c.

const int iquant_tbl24[] [static]

Initial value:

           { INT_MIN, 135, 273, 373, 373, 273, 135, INT_MIN }

Definition at line 105 of file g726.c.

const int iquant_tbl32[] [static]

Initial value:

           { INT_MIN,   4, 135, 213, 273, 323, 373, 425,
                 425, 373, 323, 273, 213, 135,   4, INT_MIN }

Definition at line 114 of file g726.c.

const int iquant_tbl40[] [static]

Initial value:

           { INT_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, INT_MIN }

Definition at line 126 of file g726.c.

const int quant_tbl16[] [static]

Initial value:

           { 260, INT_MAX }

16kbit/s 2bits per sample

Definition at line 94 of file g726.c.

const int quant_tbl24[] [static]

Initial value:

           {  7, 217, 330, INT_MAX }

24kbit/s 3bits per sample

Definition at line 103 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 112 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 123 of file g726.c.

const int W_tbl16[] [static]

Initial value:

           { -22, 439, 439, -22 }

Definition at line 98 of file g726.c.

const int W_tbl24[] [static]

Initial value:

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

Definition at line 107 of file g726.c.

const int W_tbl32[] [static]

Initial value:

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

Definition at line 117 of file g726.c.

const int 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 131 of file g726.c.