ref: 310af750eb5726b4143a43208f2bc03677c6f5db
dir: /silk/SKP_Silk_main.h/
/***********************************************************************
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***********************************************************************/
#ifndef SKP_SILK_MAIN_H
#define SKP_SILK_MAIN_H
#ifdef __cplusplus
extern "C"
{
#endif
#include "SKP_Silk_SigProc_FIX.h"
#include "SKP_Silk_define.h"
#include "SKP_Silk_structs.h"
#include "SKP_Silk_tables.h"
#include "SKP_Silk_PLC.h"
#include "SKP_Silk_control.h"
#include "SKP_debug.h"
#include "entenc.h"
#include "entdec.h"
/* Uncomment the next line to store intermadiate data to files */
//#define SAVE_ALL_INTERNAL_DATA 1
/* Uncomment the next line to force a fixed internal sampling rate (independent of what bitrate is used */
//#define FORCE_INTERNAL_FS_KHZ 16
/* Convert Left/Right stereo signal to adaptive Mid/Side representation */
void SKP_Silk_stereo_LR_to_MS(
stereo_state *state, /* I/O State */
SKP_int16 x1[], /* I/O Left input signal, becomes mid signal */
SKP_int16 x2[], /* I/O Right input signal, becomes side signal */
SKP_int *predictorIx, /* O Index for predictor filter */
SKP_int fs_kHz, /* I Samples rate (kHz) */
SKP_int frame_length /* I Number of samples */
);
/* Convert adaptive Mid/Side representation to Left/Right stereo signal */
void SKP_Silk_stereo_MS_to_LR(
stereo_state *state, /* I/O State */
SKP_int16 x1[], /* I/O Left input signal, becomes mid signal */
SKP_int16 x2[], /* I/O Right input signal, becomes side signal */
SKP_int predictorIx, /* I Index for predictor filter */
SKP_int fs_kHz, /* I Samples rate (kHz) */
SKP_int frame_length /* I Number of samples */
);
/* Encodes signs of excitation */
void SKP_Silk_encode_signs(
ec_enc *psRangeEnc, /* I/O Compressor data structure */
const SKP_int8 pulses[], /* I pulse signal */
SKP_int length, /* I length of input */
const SKP_int signalType, /* I Signal type */
const SKP_int quantOffsetType, /* I Quantization offset type */
const SKP_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
);
/* Decodes signs of excitation */
void SKP_Silk_decode_signs(
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int pulses[], /* I/O pulse signal */
SKP_int length, /* I length of input */
const SKP_int signalType, /* I Signal type */
const SKP_int quantOffsetType, /* I Quantization offset type */
const SKP_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
);
/* Check encoder control struct */
SKP_int check_control_input(
SKP_SILK_SDK_EncControlStruct *encControl /* I: Control structure */
);
/* Control internal sampling rate */
SKP_int SKP_Silk_control_audio_bandwidth(
SKP_Silk_encoder_state *psEncC /* I/O Pointer to Silk encoder state */
);
/* Control SNR of redidual quantizer */
SKP_int SKP_Silk_control_SNR(
SKP_Silk_encoder_state *psEncC, /* I/O Pointer to Silk encoder state */
SKP_int32 TargetRate_bps /* I Target max bitrate (bps) */
);
/***************/
/* Shell coder */
/***************/
/* Encode quantization indices of excitation */
void SKP_Silk_encode_pulses(
ec_enc *psRangeEnc, /* I/O compressor data structure */
const SKP_int signalType, /* I Signal type */
const SKP_int quantOffsetType, /* I quantOffsetType */
SKP_int8 pulses[], /* I quantization indices */
const SKP_int frame_length /* I Frame length */
);
/* Shell encoder, operates on one shell code frame of 16 pulses */
void SKP_Silk_shell_encoder(
ec_enc *psRangeEnc, /* I/O compressor data structure */
const SKP_int *pulses0 /* I data: nonnegative pulse amplitudes */
);
/* Shell decoder, operates on one shell code frame of 16 pulses */
void SKP_Silk_shell_decoder(
SKP_int *pulses0, /* O data: nonnegative pulse amplitudes */
ec_dec *psRangeDec, /* I/O Compressor data structure */
const SKP_int pulses4 /* I number of pulses per pulse-subframe */
);
/* Gain scalar quantization with hysteresis, uniform on log scale */
void SKP_Silk_gains_quant(
SKP_int8 ind[ MAX_NB_SUBFR ], /* O gain indices */
SKP_int32 gain_Q16[ MAX_NB_SUBFR ], /* I/O gains (quantized out) */
SKP_int8 *prev_ind, /* I/O last index in previous frame */
const SKP_int conditional, /* I first gain is delta coded if 1 */
const SKP_int nb_subfr /* I number of subframes */
);
/* Gains scalar dequantization, uniform on log scale */
void SKP_Silk_gains_dequant(
SKP_int32 gain_Q16[ MAX_NB_SUBFR ], /* O quantized gains */
const SKP_int8 ind[ MAX_NB_SUBFR ], /* I gain indices */
SKP_int8 *prev_ind, /* I/O last index in previous frame */
const SKP_int conditional, /* I first gain is delta coded if 1 */
const SKP_int nb_subfr /* I number of subframes */
);
/* Convert NLSF parameters to stable AR prediction filter coefficients */
void SKP_Silk_NLSF2A_stable(
SKP_int16 pAR_Q12[ MAX_LPC_ORDER ], /* O Stabilized AR coefs [LPC_order] */
const SKP_int16 pNLSF[ MAX_LPC_ORDER ], /* I NLSF vector [LPC_order] */
const SKP_int LPC_order /* I LPC/LSF order */
);
/* Interpolate two vectors */
void SKP_Silk_interpolate(
SKP_int16 xi[ MAX_LPC_ORDER ], /* O interpolated vector */
const SKP_int16 x0[ MAX_LPC_ORDER ], /* I first vector */
const SKP_int16 x1[ MAX_LPC_ORDER ], /* I second vector */
const SKP_int ifact_Q2, /* I interp. factor, weight on 2nd vector */
const SKP_int d /* I number of parameters */
);
/* LTP tap quantizer */
void SKP_Silk_quant_LTP_gains(
SKP_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* I/O (un)quantized LTP gains */
SKP_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook Index */
SKP_int8 *periodicity_index, /* O Periodicity Index */
const SKP_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Error Weights in Q18 */
SKP_int mu_Q9, /* I Mu value (R/D tradeoff) */
SKP_int lowComplexity, /* I Flag for low complexity */
const SKP_int nb_subfr /* I number of subframes */
);
/* Entropy constrained matrix-weighted VQ, for a single input data vector */
void SKP_Silk_VQ_WMat_EC(
SKP_int8 *ind, /* O index of best codebook vector */
SKP_int32 *rate_dist_Q14, /* O best weighted quantization error + mu * rate*/
const SKP_int16 *in_Q14, /* I input vector to be quantized */
const SKP_int32 *W_Q18, /* I weighting matrix */
const SKP_int8 *cb_Q7, /* I codebook */
const SKP_uint8 *cl_Q5, /* I code length for each codebook vector */
const SKP_int mu_Q9, /* I tradeoff between weighted error and rate */
SKP_int L /* I number of vectors in codebook */
);
/***********************************/
/* Noise shaping quantization (NSQ)*/
/***********************************/
void SKP_Silk_NSQ(
const SKP_Silk_encoder_state *psEncC, /* I/O Encoder State */
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
SideInfoIndices *psIndices, /* I/O Quantization Indices */
const SKP_int16 x[], /* I prefiltered input signal */
SKP_int8 pulses[], /* O quantized qulse signal */
const SKP_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I Short term prediction coefficients */
const SKP_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ], /* I Long term prediction coefficients */
const SKP_int16 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I */
const SKP_int HarmShapeGain_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int Tilt_Q14[ MAX_NB_SUBFR ], /* I Spectral tilt */
const SKP_int32 LF_shp_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I */
const SKP_int pitchL[ MAX_NB_SUBFR ], /* I */
const SKP_int Lambda_Q10, /* I */
const SKP_int LTP_scale_Q14 /* I LTP state scaling */
);
/* Noise shaping using delayed decision */
void SKP_Silk_NSQ_del_dec(
const SKP_Silk_encoder_state *psEncC, /* I/O Encoder State */
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
SideInfoIndices *psIndices, /* I/O Quantization Indices */
const SKP_int16 x[], /* I Prefiltered input signal */
SKP_int8 pulses[], /* O Quantized pulse signal */
const SKP_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I Prediction coefs */
const SKP_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ], /* I LT prediction coefs */
const SKP_int16 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I */
const SKP_int HarmShapeGain_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int Tilt_Q14[ MAX_NB_SUBFR ], /* I Spectral tilt */
const SKP_int32 LF_shp_Q14[ MAX_NB_SUBFR ], /* I */
const SKP_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I */
const SKP_int pitchL[ MAX_NB_SUBFR ], /* I */
const SKP_int Lambda_Q10, /* I */
const SKP_int LTP_scale_Q14 /* I LTP state scaling */
);
/************/
/* Silk VAD */
/************/
/* Initialize the Silk VAD */
SKP_int SKP_Silk_VAD_Init( /* O Return value, 0 if success */
SKP_Silk_VAD_state *psSilk_VAD /* I/O Pointer to Silk VAD state */
);
/* Silk VAD noise level estimation */
void SKP_Silk_VAD_GetNoiseLevels(
const SKP_int32 pX[ VAD_N_BANDS ], /* I subband energies */
SKP_Silk_VAD_state *psSilk_VAD /* I/O Pointer to Silk VAD state */
);
/* Get speech activity level in Q8 */
SKP_int SKP_Silk_VAD_GetSA_Q8( /* O Return value, 0 if success */
SKP_Silk_encoder_state *psEncC, /* I/O Encoder state */
const SKP_int16 pIn[] /* I PCM input */
);
/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */
void SKP_Silk_HP_variable_cutoff(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder state */
SKP_int16 *out, /* O high-pass filtered output signal */
const SKP_int16 *in, /* I input signal */
const SKP_int frame_length /* I length of input */
);
/* Low-pass filter with variable cutoff frequency based on */
/* piece-wise linear interpolation between elliptic filters */
/* Start by setting transition_frame_no = 1; */
void SKP_Silk_LP_variable_cutoff(
SKP_Silk_LP_state *psLP, /* I/O LP filter state */
SKP_int16 *signal, /* I/O Low-pass filtered output signal */
const SKP_int frame_length /* I Frame length */
);
/******************/
/* NLSF Quantizer */
/******************/
/* Limit, stabilize, convert and quantize NLSFs */
void SKP_Silk_process_NLSFs(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder state */
SKP_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */
SKP_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */
const SKP_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */
);
SKP_int32 SKP_Silk_NLSF_encode( /* O Returns RD value in Q25 */
SKP_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
SKP_int16 *pNLSF_Q15, /* I/O Quantized NLSF vector [ LPC_ORDER ] */
const SKP_Silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */
const SKP_int16 *pW_Q5, /* I NLSF weight vector [ LPC_ORDER ] */
const SKP_int NLSF_mu_Q20, /* I Rate weight for the RD optimization */
const SKP_int nSurvivors, /* I Max survivors after first stage */
const SKP_int signalType /* I Signal type: 0/1/2 */
);
/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
void SKP_Silk_NLSF_VQ(
SKP_int32 err_Q26[], /* O Quantization errors [K] */
const SKP_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */
const SKP_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */
const SKP_int K, /* I Number of codebook vectors */
const SKP_int LPC_order /* I Number of LPCs */
);
/* Delayed-decision quantizer for NLSF residuals */
SKP_int32 SKP_Silk_NLSF_del_dec_quant( /* O Returns RD value in Q25 */
SKP_int8 indices[], /* O Quantization indices [ order ] */
const SKP_int16 x_Q10[], /* I Input [ order ] */
const SKP_int16 w_Q5[], /* I Weights [ order ] */
const SKP_uint8 pred_coef_Q8[], /* I Backward predictor coefs [ order ] */
const SKP_int16 ec_ix[], /* I Indices to entropy coding tables [ order ] */
const SKP_uint8 ec_rates_Q5[], /* I Rates [] */
const SKP_int quant_step_size_Q16, /* I Quantization step size */
const SKP_int16 inv_quant_step_size_Q6, /* I Inverse quantization step size */
const SKP_int32 mu_Q20, /* I R/D tradeoff */
const SKP_int16 order /* I Number of input values */
);
/* Unpack predictor values and indices for entropy coding tables */
void SKP_Silk_NLSF_unpack(
SKP_int16 ec_ix[], /* O Indices to entropy tales [ LPC_ORDER ] */
SKP_uint8 pred_Q8[], /* O LSF predictor [ LPC_ORDER ] */
const SKP_Silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */
const SKP_int CB1_index /* I Index of vector in first LSF codebook */
);
/***********************/
/* NLSF vector decoder */
/***********************/
void SKP_Silk_NLSF_decode(
SKP_int16 *pNLSF_Q15, /* O Quantized NLSF vector [ LPC_ORDER ] */
SKP_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
const SKP_Silk_NLSF_CB_struct *psNLSF_CB /* I Codebook object */
);
/****************************************************/
/* Decoder Functions */
/****************************************************/
SKP_int SKP_Silk_create_decoder(
SKP_Silk_decoder_state **ppsDec /* I/O Decoder state pointer pointer */
);
SKP_int SKP_Silk_free_decoder(
SKP_Silk_decoder_state *psDec /* I/O Decoder state pointer */
);
SKP_int SKP_Silk_init_decoder(
SKP_Silk_decoder_state *psDec /* I/O Decoder state pointer */
);
/* Set decoder sampling rate */
void SKP_Silk_decoder_set_fs(
SKP_Silk_decoder_state *psDec, /* I/O Decoder state pointer */
SKP_int fs_kHz /* I Sampling frequency (kHz) */
);
/****************/
/* Decode frame */
/****************/
SKP_int SKP_Silk_decode_frame(
SKP_Silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int16 pOut[], /* O Pointer to output speech frame */
SKP_int32 *pN, /* O Pointer to size of output frame */
SKP_int lostFlag /* I 0: no loss, 1 loss, 2 decode fec */
);
/* Decode LBRR side info and excitation */
void SKP_Silk_LBRR_extract(
SKP_Silk_decoder_state *psDec, /* I/O State */
ec_dec *psRangeDec /* I/O Compressor data structure */
);
/* Decode indices from payload v4 Bitstream */
void SKP_Silk_decode_indices(
SKP_Silk_decoder_state *psDec, /* I/O State */
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int FrameIndex, /* I Frame number */
SKP_int decode_LBRR /* I Flag indicating LBRR data is being decoded */
);
/* Decode parameters from payload */
void SKP_Silk_decode_parameters(
SKP_Silk_decoder_state *psDec, /* I/O State */
SKP_Silk_decoder_control *psDecCtrl /* I/O Decoder control */
);
/* Core decoder. Performs inverse NSQ operation LTP + LPC */
void SKP_Silk_decode_core(
SKP_Silk_decoder_state *psDec, /* I/O Decoder state */
SKP_Silk_decoder_control *psDecCtrl, /* I Decoder control */
SKP_int16 xq[], /* O Decoded speech */
const SKP_int pulses[ MAX_FRAME_LENGTH ] /* I Pulse signal */
);
/* Decode quantization indices of excitation (Shell coding) */
void SKP_Silk_decode_pulses(
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int pulses[], /* O Excitation signal */
const SKP_int signalType, /* I Sigtype */
const SKP_int quantOffsetType, /* I quantOffsetType */
const SKP_int frame_length /* I Frame length */
);
/******************/
/* CNG */
/******************/
/* Reset CNG */
void SKP_Silk_CNG_Reset(
SKP_Silk_decoder_state *psDec /* I/O Decoder state */
);
/* Updates CNG estimate, and applies the CNG when packet was lost */
void SKP_Silk_CNG(
SKP_Silk_decoder_state *psDec, /* I/O Decoder state */
SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
SKP_int16 signal[], /* I/O Signal */
SKP_int length /* I Length of residual */
);
/* Encoding of various parameters */
void SKP_Silk_encode_indices(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder state */
ec_enc *psRangeEnc, /* I/O Compressor data structure */
SKP_int FrameIndex, /* I Frame number */
SKP_int encode_LBRR /* I Flag indicating LBRR data is being encoded */
);
#ifdef __cplusplus
}
#endif
#endif