FFmpeg: libavcodec/lpc.h File Reference

Enumerator
FF_LPC_TYPE_DEFAULT	use the codec default LPC type
FF_LPC_TYPE_NONE	do not use LPC prediction or use all zero coefficients
FF_LPC_TYPE_FIXED	fixed LPC coefficients
FF_LPC_TYPE_LEVINSON	Levinson-Durbin recursion.
FF_LPC_TYPE_CHOLESKY	Cholesky factorization.
FF_LPC_TYPE_NB	Not part of ABI.

Definition at line 44 of file lpc.h.

Function Documentation

◆ ff_lpc_calc_coefs()

int ff_lpc_calc_coefs ( LPCContext * s,

const int32_t * samples,

int blocksize,

int min_order,

int max_order,

int precision,

int32_t coefs[][MAX_LPC_ORDER],

int * shift,

enum FFLPCType lpc_type,

int lpc_passes,

int omethod,

int min_shift,

int max_shift,

int zero_shift

)

Calculate LPC coefficients for multiple orders.

Parameters: lpc_type LPC method for determining coefficients, see FFLPCType for details

Definition at line 207 of file lpc.c.

Referenced by calc_predictor_params(), encode_residual_ch(), ra144_encode_frame(), and set_filter_params().

◆ ff_lpc_calc_ref_coefs()

int ff_lpc_calc_ref_coefs ( LPCContext * s,

const int32_t * samples,

int order,

double * ref

)

Definition at line 166 of file lpc.c.

Referenced by cng_encode_frame().

◆ ff_lpc_calc_ref_coefs_f()

double ff_lpc_calc_ref_coefs_f ( LPCContext * s,

const float * samples,

int len,

int order,

double * ref

)

Definition at line 178 of file lpc.c.

Referenced by ff_aac_search_for_tns().

◆ ff_lpc_init()

int ff_lpc_init ( LPCContext * s,

int blocksize,

int max_order,

enum FFLPCType lpc_type

)

Initialize LPCContext.

Definition at line 307 of file lpc.c.

Referenced by aac_encode_init(), alac_encode_init(), checkasm_check_lpc(), cng_encode_init(), ff_lpc_calc_coefs(), flac_encode_init(), mlp_encode_init(), and ra144_encode_init().

◆ ff_lpc_init_x86()

void ff_lpc_init_x86 ( LPCContext * s )

Definition at line 106 of file lpc_init.c.

Referenced by ff_lpc_init().

◆ ff_lpc_end()

void ff_lpc_end ( LPCContext * s )

Uninitialize LPCContext.

Definition at line 330 of file lpc.c.

Referenced by aac_encode_end(), alac_encode_close(), checkasm_check_lpc(), cng_encode_close(), ff_lpc_calc_coefs(), flac_encode_close(), mlp_encode_close(), and ra144_encode_close().

◆ compute_ref_coefs()

static void compute_ref_coefs ( const LPC_TYPE * autoc,

int max_order,

LPC_TYPE * ref,

LPC_TYPE * error

)

inlinestatic

Schur recursion.

Produces reflection coefficients from autocorrelation data.

Definition at line 136 of file lpc.h.

Referenced by ff_lpc_calc_ref_coefs(), and ff_lpc_calc_ref_coefs_f().

◆ compute_lpc_coefs()

static int AAC_RENAME() compute_lpc_coefs ( const LPC_TYPE * autoc,

int max_order,

LPC_TYPE * lpc,

int lpc_stride,

int fail,

int normalize

)

inlinestatic

Levinson-Durbin recursion.

Produce LPC coefficients from autocorrelation data.

Definition at line 167 of file lpc.h.

Referenced by apply_tns(), backward_filter(), ff_aac_apply_tns(), and ff_lpc_calc_coefs().

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