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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"


/* Encodes signs of excitation */
void SKP_Silk_encode_signs(
    SKP_Silk_range_coder_state  *psRC,              /* I/O  Range coder state                           */
    const SKP_int8              q[],                /* I    pulse signal                                */
    const SKP_int               length,             /* I    length of input                             */
    const SKP_int               sigtype,            /* I    Signal type                                 */
    const SKP_int               QuantOffsetType,    /* I    Quantization offset type                    */
    const SKP_int               RateLevelIndex      /* I    Rate Level Index                            */
);

/* Decodes signs of excitation */
void SKP_Silk_decode_signs(
    SKP_Silk_range_coder_state  *psRC,              /* I/O  Range coder state                           */
    SKP_int                     q[],                /* I/O  pulse signal                                */
    const SKP_int               length,             /* I    length of output                            */
    const SKP_int               sigtype,            /* I    Signal type                                 */
    const SKP_int               QuantOffsetType,    /* I    Quantization offset type                    */
    const SKP_int               RateLevelIndex      /* I    Rate Level Index                            */
);

/* Control internal sampling rate */
SKP_int SKP_Silk_control_audio_bandwidth(
    SKP_Silk_encoder_state      *psEncC,            /* I/O  Pointer to Silk encoder state               */
    const SKP_int32             TargetRate_bps      /* I    Target max bitrate (bps)                    */
);

/***************/
/* Shell coder */
/***************/

/* Encode quantization indices of excitation */
void SKP_Silk_encode_pulses(
    SKP_Silk_range_coder_state  *psRC,              /* I/O  Range coder state                           */
    const SKP_int               sigtype,            /* I    Sigtype                                     */
    const SKP_int               QuantOffsetType,    /* I    QuantOffsetType                             */
    const SKP_int8              q[],                /* 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(
    SKP_Silk_range_coder_state  *psRC,              /* 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          */
    SKP_Silk_range_coder_state  *psRC,              /* I/O  compressor data structure                   */
    const SKP_int               pulses4             /* I    number of pulses per pulse-subframe         */
);

/***************/
/* Range coder */
/***************/
/* Range encoder for one symbol */
void SKP_Silk_range_encoder(
    SKP_Silk_range_coder_state  *psRC,              /* I/O  compressor data structure                   */
    const SKP_int               data,               /* I    uncompressed data                           */
    const SKP_uint16            prob[]              /* I    cumulative density functions                */
);
    
/* Range encoder for multiple symbols */
void SKP_Silk_range_encoder_multi(
    SKP_Silk_range_coder_state  *psRC,              /* I/O  compressor data structure                   */
    const SKP_int               data[],             /* I    uncompressed data    [nSymbols]             */
    const SKP_uint16 * const    prob[],             /* I    cumulative density functions                */
    const SKP_int               nSymbols            /* I    number of data symbols                      */
);

/* Range decoder for one symbol */
void SKP_Silk_range_decoder(
    SKP_int                     data[],             /* O    uncompressed data                           */
    SKP_Silk_range_coder_state  *psRC,              /* I/O  compressor data structure                   */
    const SKP_uint16            prob[],             /* I    cumulative density function                 */
    SKP_int                     probIx              /* I    initial (middle) entry of cdf               */
);

/* Range decoder for multiple symbols */
void SKP_Silk_range_decoder_multi(
    SKP_int                     data[],             /* O    uncompressed data                [nSymbols] */
    SKP_Silk_range_coder_state  *psRC,              /* I/O  compressor data structure                   */
    const SKP_uint16 * const    prob[],             /* I    cumulative density functions                */
    const SKP_int               probStartIx[],      /* I    initial (middle) entries of cdfs [nSymbols] */
    const SKP_int               nSymbols            /* I    number of data symbols                      */
);

/* Initialize range coder structure for encoder */
void SKP_Silk_range_enc_init(
    SKP_Silk_range_coder_state  *psRC               /* O    compressor data structure                   */
);

/* Initialize range coder structure for decoder */
void SKP_Silk_range_dec_init(
    SKP_Silk_range_coder_state  *psRC,              /* O    compressor data structure                   */
    const SKP_uint8             buffer[],           /* I    buffer for compressed data [bufferLength]   */
    const SKP_int32             bufferLength        /* I    buffer length (in bytes)                    */
);

/* Determine length of bitstream */
SKP_int SKP_Silk_range_coder_get_length(            /* O    returns number of BITS in stream            */
    const SKP_Silk_range_coder_state    *psRC,      /* I    compressed data structure                   */
    SKP_int                             *nBytes     /* O    number of BYTES in stream                   */
);

/* Write decodable stream to buffer, and determine its length */
void SKP_Silk_range_enc_wrap_up(
    SKP_Silk_range_coder_state  *psRC               /* I/O  compressed data structure                   */
);

/* Check that any remaining bits in the last byte are set to 1 */
void SKP_Silk_range_coder_check_after_decoding(
    SKP_Silk_range_coder_state  *psRC               /* I/O  compressed data structure                   */
);

/* Gain scalar quantization with hysteresis, uniform on log scale */
void SKP_Silk_gains_quant(
    SKP_int                     ind[ NB_SUBFR ],        /* O    gain indices                            */
    SKP_int32                   gain_Q16[ NB_SUBFR ],   /* I/O  gains (quantized out)                   */
    SKP_int                     *prev_ind,              /* I/O  last index in previous frame            */
    const SKP_int               conditional             /* I    first gain is delta coded if 1          */
);

/* Gains scalar dequantization, uniform on log scale */
void SKP_Silk_gains_dequant(
    SKP_int32                   gain_Q16[ NB_SUBFR ],   /* O    quantized gains                         */
    const SKP_int               ind[ NB_SUBFR ],        /* I    gain indices                            */
    SKP_int                     *prev_ind,              /* I/O  last index in previous frame            */
    const SKP_int               conditional             /* I    first gain is delta coded if 1          */
);

/* 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_int               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_int                     xi[ MAX_LPC_ORDER ],    /* O    interpolated vector                     */
    const SKP_int               x0[ MAX_LPC_ORDER ],    /* I    first vector                            */
    const SKP_int               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                    */
);

/***********************************/
/* Noise shaping quantization (NSQ)*/
/***********************************/
void SKP_Silk_NSQ(
    SKP_Silk_encoder_state          *psEncC,                                    /* I/O  Encoder State                       */
    SKP_Silk_encoder_control        *psEncCtrlC,                                /* I    Encoder Control                     */
    SKP_Silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                           */
    const SKP_int16                 x[],                                        /* I    prefiltered input signal            */
    SKP_int8                        q[],                                        /* O    quantized qulse signal              */
    const SKP_int                   LSFInterpFactor_Q2,                         /* I    LSF interpolation factor in Q2      */
    const SKP_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefficients  */
    const SKP_int16                 LTPCoef_Q14[ LTP_ORDER * NB_SUBFR ],        /* I    Long term prediction coefficients   */
    const SKP_int16                 AR2_Q13[ NB_SUBFR * MAX_SHAPE_LPC_ORDER ],  /* I                                        */
    const SKP_int                   HarmShapeGain_Q14[ NB_SUBFR ],              /* I                                        */
    const SKP_int                   Tilt_Q14[ NB_SUBFR ],                       /* I    Spectral tilt                       */
    const SKP_int32                 LF_shp_Q14[ NB_SUBFR ],                     /* I                                        */
    const SKP_int32                 Gains_Q16[ 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(
    SKP_Silk_encoder_state          *psEncC,                                    /* I/O  Encoder State                       */
    SKP_Silk_encoder_control        *psEncCtrlC,                                /* I    Encoder Control                     */
    SKP_Silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                           */
    const SKP_int16                 x[],                                        /* I    Prefiltered input signal            */
    SKP_int8                        q[],                                        /* O    Quantized pulse signal              */
    const SKP_int                   LSFInterpFactor_Q2,                         /* I    LSF interpolation factor in Q2      */
    const SKP_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Prediction coefs                    */
    const SKP_int16                 LTPCoef_Q14[ LTP_ORDER * NB_SUBFR ],        /* I    LT prediction coefs                 */
    const SKP_int16                 AR2_Q13[ NB_SUBFR * MAX_SHAPE_LPC_ORDER ],  /* I                                        */
    const SKP_int                   HarmShapeGain_Q14[ NB_SUBFR ],              /* I                                        */
    const SKP_int                   Tilt_Q14[ NB_SUBFR ],                       /* I    Spectral tilt                       */
    const SKP_int32                 LF_shp_Q14[ NB_SUBFR ],                     /* I                                        */
    const SKP_int32                 Gains_Q16[ 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_VAD_state          *psSilk_VAD,                    /* I/O  Silk VAD state                  */
    SKP_int                     *pSA_Q8,                        /* O    Speech activity level in Q8     */
    SKP_int                     *pSNR_dB_Q7,                    /* O    SNR for current frame in Q7     */
    SKP_int                     pQuality_Q15[ VAD_N_BANDS ],    /* O    Smoothed SNR for each band      */
    SKP_int                     *pTilt_Q15,                     /* O    current frame's frequency tilt  */
    const SKP_int16             pIn[],                          /* I    PCM input       [framelength]   */
    const SKP_int               framelength                     /* I    Input frame length              */
);

/* Detect signal in 8 - 12 khz range */
void SKP_Silk_detect_SWB_input(
    SKP_Silk_detect_SWB_state   *psSWBdetect,       /* I/O  Encoder state                               */
    const SKP_int16             samplesIn[],        /* I    Input to encoder                            */
    SKP_int                     nSamplesIn          /* I    Length of input                             */
);

#if SWITCH_TRANSITION_FILTERING
/* 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                   *out,               /* O    Low-pass filtered output signal             */
    const SKP_int16             *in,                /* I    Input signal                                */
    const SKP_int               frame_length        /* I    Frame length                                */
);
#endif

/****************************************************/
/* 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               */
    SKP_int16                   pOut[],             /* O    Pointer to output speech frame              */
    SKP_int16                   *pN,                /* O    Pointer to size of output frame             */
    const SKP_uint8             pCode[],            /* I    Pointer to payload                          */
    const SKP_int               nBytes,             /* I    Payload length                              */
    SKP_int                     action,             /* I    Action from Jitter Buffer                   */
    SKP_int                     *decBytes           /* O    Used bytes to decode this frame             */
);

/* 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                             */
    SKP_int                     q[],                /* O    Excitation signal                           */
    const SKP_int               fullDecoding        /* I    Flag to tell if only arithmetic decoding    */
);

/* 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               q[ MAX_FRAME_LENGTH ]               /* I    Pulse signal                */
);

/* NLSF vector decoder */
void SKP_Silk_NLSF_MSVQ_decode(
    SKP_int                         *pNLSF_Q15,     /* O    Pointer to decoded output [LPC_ORDER x 1]   */
    const SKP_Silk_NLSF_CB_struct   *psNLSF_CB,     /* I    Pointer to NLSF codebook struct             */
    const SKP_int                   *NLSFIndices,   /* I    Pointer to NLSF indices [nStages x 1]       */
    const SKP_int                   LPC_order       /* I    LPC order                                   */
);

/**********************/
/* Arithmetic coding */
/*********************/

/* Decode quantization indices of excitation (Shell coding) */
void SKP_Silk_decode_pulses(
    SKP_Silk_range_coder_state  *psRC,              /* I/O  Range coder state                           */
    SKP_Silk_decoder_control    *psDecCtrl,         /* I/O  Decoder control                             */
    SKP_int                     q[],                /* O    Excitation signal                           */
    const SKP_int               frame_length        /* I    Frame length (preliminary)                  */
);

/******************/
/* 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_parameters(
    SKP_Silk_encoder_state      *psEncC,            /* I/O  Encoder state                               */
    SKP_Silk_encoder_control    *psEncCtrlC,        /* I/O  Encoder control                             */
    SKP_Silk_range_coder_state  *psRC,              /* I/O  Range coder state                           */
    const SKP_int8               *q                 /* I    Quantization indices                        */
);

/* Extract lowest layer encoding */
void SKP_Silk_get_low_layer_internal(
    const SKP_uint8             *indata,            /* I:   Encoded input vector                        */
    const SKP_int16             nBytesIn,           /* I:   Number of input Bytes                       */
    SKP_uint8                   *Layer0data,        /* O:   Layer0 payload                              */
    SKP_int16                   *nLayer0Bytes       /* O:   Number of FEC Bytes                         */
);

/* Resets LBRR buffer, used if packet size changes */
void SKP_Silk_LBRR_reset( 
    SKP_Silk_encoder_state      *psEncC             /* I/O  Pointer to Silk encoder state               */
);


#ifdef __cplusplus
}
#endif

#endif
