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#ifndef SKP_SILK_STRUCTS_H
#define SKP_SILK_STRUCTS_H

#include "SKP_Silk_typedef.h"
#include "SKP_Silk_SigProc_FIX.h"
#include "SKP_Silk_define.h"

#ifdef __cplusplus
extern "C"
{
#endif


/************************************/
/* Noise shaping quantization state */
/************************************/
typedef struct {
    SKP_int16   xq[           2 * MAX_FRAME_LENGTH ]; /* Buffer for quantized output signal */
    SKP_int32   sLTP_shp_Q10[ 2 * MAX_FRAME_LENGTH ];
    SKP_int32   sLPC_Q14[ MAX_FRAME_LENGTH / NB_SUBFR + NSQ_LPC_BUF_LENGTH ];
    SKP_int32   sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
    SKP_int32   sLF_AR_shp_Q12;
    SKP_int     lagPrev;
    SKP_int     sLTP_buf_idx;
    SKP_int     sLTP_shp_buf_idx;
    SKP_int32   rand_seed;
    SKP_int32   prev_inv_gain_Q16;
    SKP_int     rewhite_flag;
} SKP_Silk_nsq_state; /* FIX*/

/* Struct for Low BitRate Redundant (LBRR) information */
typedef struct {
    SKP_uint8   payload[ MAX_ARITHM_BYTES ];    
    SKP_int     nBytes;                         /* Number of bytes in payload                               */
    SKP_int     usage;                          /* Tells how the payload should be used as FEC              */
} SKP_SILK_LBRR_struct;

/********************************/
/* VAD state                    */
/********************************/
typedef struct {
    SKP_int32   AnaState[ 2 ];                  /* Analysis filterbank state: 0-8 kHz                       */
    SKP_int32   AnaState1[ 2 ];                 /* Analysis filterbank state: 0-4 kHz                       */
    SKP_int32   AnaState2[ 2 ];                 /* Analysis filterbank state: 0-2 kHz                       */
    SKP_int32   XnrgSubfr[ VAD_N_BANDS ];       /* Subframe energies                                        */
    SKP_int32   NrgRatioSmth_Q8[ VAD_N_BANDS ]; /* Smoothed energy level in each band                       */
    SKP_int16   HPstate;                        /* State of differentiator in the lowest band               */
    SKP_int32   NL[ VAD_N_BANDS ];              /* Noise energy level in each band                          */
    SKP_int32   inv_NL[ VAD_N_BANDS ];          /* Inverse noise energy level in each band                  */
    SKP_int32   NoiseLevelBias[ VAD_N_BANDS ];  /* Noise level estimator bias/offset                        */
    SKP_int32   counter;                        /* Frame counter used in the initial phase                  */
} SKP_Silk_VAD_state;

/*******************************/
/* Range encoder/decoder state */
/*******************************/
typedef struct {
    SKP_int32   bufferLength;
    SKP_int32   bufferIx;
    SKP_uint32  base_Q32;
    SKP_uint32  range_Q16;
    SKP_int32   error;
    SKP_uint8   buffer[ MAX_ARITHM_BYTES ];     /* Buffer containing payload                                */
} SKP_Silk_range_coder_state;

/* Input frequency range detection struct */
typedef struct {
    SKP_int32                   S_HP_8_kHz[ NB_SOS ][ 2 ];  /* HP filter State */
    SKP_int32                   ConsecSmplsAboveThres;
    SKP_int32                   ActiveSpeech_ms;            /* Accumulated time with active speech */
    SKP_int                     SWB_detected;               /* Flag to indicate SWB input */
    SKP_int                     WB_detected;                /* Flag to indicate WB input */
} SKP_Silk_detect_SWB_state;

#if SWITCH_TRANSITION_FILTERING
/* Variable cut-off low-pass filter state */
typedef struct {
    SKP_int32                   In_LP_State[ 2 ];           /* Low pass filter state */
    SKP_int32                   transition_frame_no;        /* Counter which is mapped to a cut-off frequency */
    SKP_int                     mode;                       /* Operating mode, 0: switch down, 1: switch up */
} SKP_Silk_LP_state;
#endif

/* Structure for one stage of MSVQ */
typedef struct {
    const SKP_int32             nVectors;
    const SKP_int16             *CB_NLSF_Q15;
    const SKP_int16             *Rates_Q5;
} SKP_Silk_NLSF_CBS;

/* Structure containing NLSF MSVQ codebook */
typedef struct {
    const SKP_int32             nStages;

    /* Fields for (de)quantizing */
    const SKP_Silk_NLSF_CBS     *CBStages;
    const SKP_int               *NDeltaMin_Q15;

    /* Fields for arithmetic (de)coding */
    const SKP_uint16            *CDF;
    const SKP_uint16 * const    *StartPtr;
    const SKP_int               *MiddleIx;
} SKP_Silk_NLSF_CB_struct;

/********************************/
/* Encoder state                */
/********************************/
typedef struct {
    SKP_Silk_range_coder_state      sRC;                            /* Range coder state                                                    */
    SKP_Silk_range_coder_state      sRC_LBRR;                       /* Range coder state (for low bitrate redundancy)                       */
#if HIGH_PASS_INPUT
    SKP_int32                       In_HP_State[ 2 ];               /* High pass filter state                                               */
#endif
#if SWITCH_TRANSITION_FILTERING
    SKP_Silk_LP_state               sLP;                            /* Low pass filter state */
#endif
    SKP_Silk_VAD_state              sVAD;                           /* Voice activity detector state                                        */

    SKP_int                         LBRRprevLastGainIndex;
    SKP_int                         prev_sigtype;
    SKP_int                         typeOffsetPrev;                 /* Previous signal type and quantization offset                         */
    SKP_int                         prevLag;
    SKP_int                         prev_lagIndex;
    SKP_int32                       API_fs_Hz;                      /* API sampling frequency (Hz)                                          */
    SKP_int32                       prev_API_fs_Hz;                 /* Previous API sampling frequency (Hz)                                 */
    SKP_int                         maxInternal_fs_kHz;             /* Maximum internal sampling frequency (kHz)                            */
    SKP_int                         fs_kHz;                         /* Internal sampling frequency (kHz)                                    */
    SKP_int                         fs_kHz_changed;                 /* Did we switch yet?                                                   */
    SKP_int                         frame_length;                   /* Frame length (samples)                                               */
    SKP_int                         subfr_length;                   /* Subframe length (samples)                                            */
    SKP_int                         la_pitch;                       /* Look-ahead for pitch analysis (samples)                              */
    SKP_int                         la_shape;                       /* Look-ahead for noise shape analysis (samples)                        */
    SKP_int                         shapeWinLength;                 /* Window length for noise shape analysis (samples)                     */
    SKP_int32                       TargetRate_bps;                 /* Target bitrate (bps)                                                 */
    SKP_int                         PacketSize_ms;                  /* Number of milliseconds to put in each packet                         */
    SKP_int                         PacketLoss_perc;                /* Packet loss rate measured by farend                                  */
    SKP_int32                       frameCounter;
    SKP_int                         Complexity;                     /* Complexity setting: 0-> low; 1-> medium; 2->high                     */
    SKP_int                         nStatesDelayedDecision;         /* Number of states in delayed decision quantization                    */
    SKP_int                         useInterpolatedNLSFs;           /* Flag for using NLSF interpolation                                    */
    SKP_int                         shapingLPCOrder;                /* Filter order for noise shaping filters                               */
    SKP_int                         predictLPCOrder;                /* Filter order for prediction filters                                  */
    SKP_int                         pitchEstimationComplexity;      /* Complexity level for pitch estimator                                 */
    SKP_int                         pitchEstimationLPCOrder;        /* Whitening filter order for pitch estimator                           */
    SKP_int32                       pitchEstimationThreshold_Q16;   /* Threshold for pitch estimator                                        */
    SKP_int                         LTPQuantLowComplexity;          /* Flag for low complexity LTP quantization                             */
    SKP_int                         NLSF_MSVQ_Survivors;            /* Number of survivors in NLSF MSVQ                                     */
    SKP_int                         first_frame_after_reset;        /* Flag for deactivating NLSF interp. and fluc. reduction after resets  */
    SKP_int                         controlled_since_last_payload;  /* Flag for ensuring codec_control only runs once per packet            */
	SKP_int                         warping_Q16;                    /* Warping parameter for warped noise shaping                           */

    /* Input/output buffering */
    SKP_int16                       inputBuf[ MAX_FRAME_LENGTH ];   /* buffer containin input signal                                        */
    SKP_int                         inputBufIx;
    SKP_int                         nFramesInPayloadBuf;            /* number of frames sitting in outputBuf                                */
    SKP_int                         nBytesInPayloadBuf;             /* number of bytes sitting in outputBuf                                 */

    /* Parameters For LTP scaling Control */
    SKP_int                         frames_since_onset;

    const SKP_Silk_NLSF_CB_struct   *psNLSF_CB[ 2 ];                /* Pointers to voiced/unvoiced NLSF codebooks */

    /* Struct for Inband LBRR */ 
    SKP_SILK_LBRR_struct            LBRR_buffer[ MAX_LBRR_DELAY ];
    SKP_int                         oldest_LBRR_idx;
    SKP_int                         useInBandFEC;                   /* Saves the API setting for query                                      */
    SKP_int                         LBRR_enabled;
    SKP_int                         LBRR_GainIncreases;             /* Number of shifts to Gains to get LBRR rate Voiced frames             */

    /* Bitrate control */
    SKP_int32                       bitrateDiff;                    /* Accumulated diff. between the target bitrate and the switch bitrates */
    SKP_int32                       bitrate_threshold_up;           /* Threshold for switching to a higher internal sample frequency        */
    SKP_int32                       bitrate_threshold_down;         /* Threshold for switching to a lower internal sample frequency         */

    SKP_Silk_resampler_state_struct  resampler_state;

    /* DTX */
    SKP_int                         noSpeechCounter;                /* Counts concecutive nonactive frames, used by DTX                     */
    SKP_int                         useDTX;                         /* Flag to enable DTX                                                   */
    SKP_int                         inDTX;                          /* Flag to signal DTX period                                            */
    SKP_int                         vadFlag;                        /* Flag to indicate Voice Activity                                      */

    /* Struct for detecting SWB input */
    SKP_Silk_detect_SWB_state       sSWBdetect;


    /* Buffers */
    SKP_int8                        q[ MAX_FRAME_LENGTH ];      /* pulse signal buffer */
    SKP_int8                        q_LBRR[ MAX_FRAME_LENGTH ]; /* pulse signal buffer */

} SKP_Silk_encoder_state;


/************************/
/* Encoder control      */
/************************/
typedef struct {
    /* Quantization indices */
    SKP_int     lagIndex;
    SKP_int     contourIndex;
    SKP_int     PERIndex;
    SKP_int     LTPIndex[ NB_SUBFR ];
    SKP_int     NLSFIndices[ NLSF_MSVQ_MAX_CB_STAGES ];  /* NLSF path of quantized LSF vector   */
    SKP_int     NLSFInterpCoef_Q2;
    SKP_int     GainsIndices[ NB_SUBFR ];
    SKP_int32   Seed;
    SKP_int     LTP_scaleIndex;
    SKP_int     RateLevelIndex;
    SKP_int     QuantOffsetType;
    SKP_int     sigtype;

    /* Prediction and coding parameters */
    SKP_int     pitchL[ NB_SUBFR ];

    SKP_int     LBRR_usage;                     /* Low bitrate redundancy usage                             */
} SKP_Silk_encoder_control;

/* Struct for Packet Loss Concealment */
typedef struct {
    SKP_int32   pitchL_Q8;                      /* Pitch lag to use for voiced concealment                  */
    SKP_int16   LTPCoef_Q14[ LTP_ORDER ];       /* LTP coeficients to use for voiced concealment            */
    SKP_int16   prevLPC_Q12[ MAX_LPC_ORDER ];
    SKP_int     last_frame_lost;                /* Was previous frame lost                                  */
    SKP_int32   rand_seed;                      /* Seed for unvoiced signal generation                      */
    SKP_int16   randScale_Q14;                  /* Scaling of unvoiced random signal                        */
    SKP_int32   conc_energy;
    SKP_int     conc_energy_shift;
    SKP_int16   prevLTP_scale_Q14;
    SKP_int32   prevGain_Q16[ NB_SUBFR ];
    SKP_int     fs_kHz;
} SKP_Silk_PLC_struct;

/* Struct for CNG */
typedef struct {
    SKP_int32   CNG_exc_buf_Q10[ MAX_FRAME_LENGTH ];
    SKP_int     CNG_smth_NLSF_Q15[ MAX_LPC_ORDER ];
    SKP_int32   CNG_synth_state[ MAX_LPC_ORDER ];
    SKP_int32   CNG_smth_Gain_Q16;
    SKP_int32   rand_seed;
    SKP_int     fs_kHz;
} SKP_Silk_CNG_struct;

/********************************/
/* Decoder state                */
/********************************/
typedef struct {
    SKP_Silk_range_coder_state  sRC;                            /* Range coder state                                                    */
    SKP_int32       prev_inv_gain_Q16;
    SKP_int32       sLTP_Q16[ 2 * MAX_FRAME_LENGTH ];
    SKP_int32       sLPC_Q14[ MAX_FRAME_LENGTH / NB_SUBFR + MAX_LPC_ORDER ];
    SKP_int32       exc_Q10[ MAX_FRAME_LENGTH ];
    SKP_int32       res_Q10[ MAX_FRAME_LENGTH ];
    SKP_int16       outBuf[ 2 * MAX_FRAME_LENGTH ];             /* Buffer for output signal                                             */
    SKP_int         lagPrev;                                    /* Previous Lag                                                         */
    SKP_int         LastGainIndex;                              /* Previous gain index                                                  */
    SKP_int         LastGainIndex_EnhLayer;                     /* Previous gain index                                                  */
    SKP_int         typeOffsetPrev;                             /* Previous signal type and quantization offset                         */
    SKP_int32       HPState[ DEC_HP_ORDER ];                    /* HP filter state                                                      */
    const SKP_int16 *HP_A;                                      /* HP filter AR coefficients                                            */
    const SKP_int16 *HP_B;                                      /* HP filter MA coefficients                                            */
    SKP_int         fs_kHz;                                     /* Sampling frequency in kHz                                            */
    SKP_int32       prev_API_sampleRate;                        /* Previous API sample frequency (Hz)                                   */
    SKP_int         frame_length;                               /* Frame length (samples)                                               */
    SKP_int         subfr_length;                               /* Subframe length (samples)                                            */
    SKP_int         LPC_order;                                  /* LPC order                                                            */
    SKP_int         prevNLSF_Q15[ MAX_LPC_ORDER ];              /* Used to interpolate LSFs                                             */
    SKP_int         first_frame_after_reset;                    /* Flag for deactivating NLSF interp. and fluc. reduction after resets  */

    /* For buffering payload in case of more frames per packet */
    SKP_int         nBytesLeft;
    SKP_int         nFramesDecoded;
    SKP_int         nFramesInPacket;
    SKP_int         moreInternalDecoderFrames;
    SKP_int         FrameTermination;

    SKP_Silk_resampler_state_struct  resampler_state;

    const SKP_Silk_NLSF_CB_struct *psNLSF_CB[ 2 ];      /* Pointers to voiced/unvoiced NLSF codebooks */

    /* Parameters used to investigate if inband FEC is used */
    SKP_int         vadFlag;
    SKP_int         no_FEC_counter;                             /* Counts number of frames wo inband FEC                                */
    SKP_int         inband_FEC_offset;                          /* 0: no FEC, 1: FEC with 1 packet offset, 2: FEC w 2 packets offset    */ 

    /* CNG state */
    SKP_Silk_CNG_struct sCNG;

    /* Stuff used for PLC */
    SKP_int         lossCnt;
    SKP_int         prev_sigtype;                               /* Previous sigtype                                                     */

    SKP_Silk_PLC_struct sPLC;



} SKP_Silk_decoder_state;

/************************/
/* Decoder control      */
/************************/
typedef struct {
    /* prediction and coding parameters */
    SKP_int             pitchL[ NB_SUBFR ];
    SKP_int32           Gains_Q16[ NB_SUBFR ];
    SKP_int32           Seed;
    /* holds interpolated and final coefficients, 4-byte aligned */
    SKP_DWORD_ALIGN SKP_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
    SKP_int16           LTPCoef_Q14[ LTP_ORDER * NB_SUBFR ];
    SKP_int             LTP_scale_Q14;

    /* quantization indices */
    SKP_int             PERIndex;
    SKP_int             RateLevelIndex;
    SKP_int             QuantOffsetType;
    SKP_int             sigtype;
    SKP_int             NLSFInterpCoef_Q2;
} SKP_Silk_decoder_control;

#ifdef __cplusplus
}
#endif

#endif
