FFmpeg: libavcodec/ra144.h File Reference

#include <stdint.h>
#include "lpc.h"
#include "audio_frame_queue.h"
#include "audiodsp.h"

Go to the source code of this file.

Data Structures
struct	RA144Context

Macros
#define	NBLOCKS 4
	number of subblocks within a block More...

#define	BLOCKSIZE 40
	subblock size in 16-bit words More...

#define	BUFFERSIZE 146
	the size of the adaptive codebook More...

#define	FIXED_CB_SIZE 128
	size of fixed codebooks More...

#define	FRAME_SIZE 20
	size of encoded frame More...

#define	LPC_ORDER 10
	order of LPC filter More...

Functions
void	ff_copy_and_dup (int16_t target, const int16_t source, int offset)
	Copy the last offset values of source to target. More...

int	ff_eval_refl (int refl, const int16_t coefs, AVCodecContext *avctx)
	Evaluate the reflection coefficients from the filter coefficients. More...

void	ff_eval_coefs (int coefs, const int refl)
	Evaluate the LPC filter coefficients from the reflection coefficients. More...

void	ff_int_to_int16 (int16_t out, const int inp)

int	ff_t_sqrt (unsigned int x)
	Evaluate sqrt(x << 24). More...

unsigned int	ff_rms (const int *data)

int	ff_interp (RA144Context ractx, int16_t out, int a, int copyold, int energy)

unsigned int	ff_rescale_rms (unsigned int rms, unsigned int energy)

int	ff_irms (AudioDSPContext adsp, const int16_t data)
	inverse root mean square More...

void	ff_subblock_synthesis (RA144Context ractx, const int16_t lpc_coefs, int cba_idx, int cb1_idx, int cb2_idx, int gval, int gain)

Variables
const int16_t	ff_gain_val_tab [256][3]

const uint8_t	ff_gain_exp_tab [256]

const int8_t	ff_cb1_vects [128][40]

const int8_t	ff_cb2_vects [128][40]

const uint16_t	ff_cb1_base [128]

const uint16_t	ff_cb2_base [128]

const int16_t	ff_energy_tab [32]

const int16_t *const	ff_lpc_refl_cb [10]

Macro Definition Documentation

#define NBLOCKS 4

number of subblocks within a block

Definition at line 30 of file ra144.h.

Referenced by ff_interp(), ra144_decode_frame(), ra144_encode_frame(), and ra144_encode_init().

#define BLOCKSIZE 40

subblock size in 16-bit words

Definition at line 31 of file ra144.h.

Referenced by adaptive_cb_search(), add_wav(), create_adapt_vect(), ff_copy_and_dup(), ff_irms(), ff_subblock_synthesis(), find_best_vect(), fixed_cb_search(), get_match_score(), orthogonalize(), ra144_decode_frame(), ra144_encode_frame(), ra144_encode_init(), and ra144_encode_subblock().

#define BUFFERSIZE 146

the size of the adaptive codebook

Definition at line 32 of file ra144.h.

Referenced by adaptive_cb_search(), create_adapt_vect(), ff_copy_and_dup(), and ff_subblock_synthesis().

#define FIXED_CB_SIZE 128

size of fixed codebooks

Definition at line 33 of file ra144.h.

Referenced by find_best_vect().

#define FRAME_SIZE 20

size of encoded frame

Definition at line 34 of file ra144.h.

#define LPC_ORDER 10

order of LPC filter

Definition at line 35 of file ra144.h.

Function Documentation

void ff_copy_and_dup	(	int16_t *	target,
		const int16_t *	source,
		int	offset
	)

Copy the last offset values of *source to *target.

If those values are not enough to fill the target buffer, fill it with another copy of those values.

Definition at line 1530 of file ra144.c.

Referenced by ff_subblock_synthesis(), and ra144_encode_subblock().

int ff_eval_refl	(	int *	refl,
		const int16_t *	coefs,
		AVCodecContext *	avctx
	)

Evaluate the reflection coefficients from the filter coefficients.

Returns: 1 if one of the reflection coefficients is greater than 4095, 0 if not.

Definition at line 1545 of file ra144.c.

Referenced by ff_interp(), and ra144_encode_frame().

void ff_eval_coefs	(	int *	coefs,
		const int *	refl
	)

Evaluate the LPC filter coefficients from the reflection coefficients.

Does the inverse of the ff_eval_refl() function.

Definition at line 1593 of file ra144.c.

Referenced by ra144_decode_frame(), and ra144_encode_frame().

void ff_int_to_int16	(	int16_t *	out,
		const int *	inp
	)

Definition at line 1613 of file ra144.c.

Referenced by ff_interp(), ra144_decode_frame(), and ra144_encode_frame().

int ff_t_sqrt ( unsigned int x )

Evaluate sqrt(x << 24).

x must fit in 20 bits. This value is evaluated in an odd way to make the output identical to the binary decoder.

Definition at line 1625 of file ra144.c.

Referenced by ff_irms(), ff_rms(), ra144_decode_frame(), and ra144_encode_frame().

unsigned int ff_rms ( const int * data )

Definition at line 1636 of file ra144.c.

Referenced by ff_interp(), ra144_decode_frame(), and ra144_encode_frame().

int ff_interp	(	RA144Context *	ractx,
		int16_t *	out,
		int	a,
		int	copyold,
		int	energy
	)

Definition at line 1657 of file ra144.c.

Referenced by ra144_decode_frame(), and ra144_encode_frame().

unsigned int ff_rescale_rms	(	unsigned int	rms,
		unsigned int	energy
	)

Definition at line 1678 of file ra144.c.

Referenced by ff_interp(), ra144_decode_frame(), and ra144_encode_frame().

int ff_irms	(	AudioDSPContext *	adsp,
		const int16_t *	data
	)

inverse root mean square

Definition at line 1684 of file ra144.c.

Referenced by ff_subblock_synthesis(), and ra144_encode_subblock().

void ff_subblock_synthesis	(	RA144Context *	ractx,
		const int16_t *	lpc_coefs,
		int	cba_idx,
		int	cb1_idx,
		int	cb2_idx,
		int	gval,
		int	gain
	)

Definition at line 1694 of file ra144.c.

Referenced by do_output_subblock(), and ra144_encode_subblock().

Variable Documentation

const int16_t ff_gain_val_tab[256][3]

Definition at line 28 of file ra144.c.

Referenced by add_wav(), and ra144_encode_subblock().

const uint8_t ff_gain_exp_tab[256]

Definition at line 95 of file ra144.c.

Referenced by add_wav(), and ra144_encode_subblock().

const int8_t ff_cb1_vects[128][40]

Definition at line 114 of file ra144.c.

Referenced by ff_subblock_synthesis(), fixed_cb_search(), and ra144_encode_subblock().

const int8_t ff_cb2_vects[128][40]

Definition at line 758 of file ra144.c.

Referenced by ff_subblock_synthesis(), fixed_cb_search(), and ra144_encode_subblock().

const uint16_t ff_cb1_base[128]

Definition at line 1402 of file ra144.c.

Referenced by ff_subblock_synthesis(), and ra144_encode_subblock().

const uint16_t ff_cb2_base[128]

Definition at line 1421 of file ra144.c.

Referenced by ff_subblock_synthesis(), and ra144_encode_subblock().

const int16_t ff_energy_tab[32]

Definition at line 1440 of file ra144.c.

Referenced by ra144_decode_frame(), and ra144_encode_frame().

const int16_t* const ff_lpc_refl_cb[10]

Definition at line 1502 of file ra144.c.

Referenced by ra144_decode_frame(), and ra144_encode_frame().