silk/structs.h

/***********************************************************************
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#ifndef SILK_STRUCTS_H
#define SILK_STRUCTS_H

#include "typedef.h"
#include "SigProc_FIX.h"
#include "define.h"
#include "entenc.h"
#include "entdec.h"

#ifdef __cplusplus
extern "C"
{
#endif

/************************************/
/* Noise shaping quantization state */
/************************************/
typedef struct {
    opus_int16                  xq[           2 * MAX_FRAME_LENGTH ]; /* Buffer for quantized output signal                             */
    opus_int32                  sLTP_shp_Q14[ 2 * MAX_FRAME_LENGTH ];
    opus_int32                  sLPC_Q14[ MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH ];
    opus_int32                  sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
    opus_int32                  sLF_AR_shp_Q14;
    opus_int32                  sDiff_shp_Q14;
    opus_int                    lagPrev;
    opus_int                    sLTP_buf_idx;
    opus_int                    sLTP_shp_buf_idx;
    opus_int32                  rand_seed;
    opus_int32                  prev_gain_Q16;
    opus_int                    rewhite_flag;
} silk_nsq_state;

/********************************/
/* VAD state                    */
/********************************/
typedef struct {
    opus_int32                  AnaState[ 2 ];                  /* Analysis filterbank state: 0-8 kHz                                   */
    opus_int32                  AnaState1[ 2 ];                 /* Analysis filterbank state: 0-4 kHz                                   */
    opus_int32                  AnaState2[ 2 ];                 /* Analysis filterbank state: 0-2 kHz                                   */
    opus_int32                  XnrgSubfr[ VAD_N_BANDS ];       /* Subframe energies                                                    */
    opus_int32                  NrgRatioSmth_Q8[ VAD_N_BANDS ]; /* Smoothed energy level in each band                                   */
    opus_int16                  HPstate;                        /* State of differentiator in the lowest band                           */
    opus_int32                  NL[ VAD_N_BANDS ];              /* Noise energy level in each band                                      */
    opus_int32                  inv_NL[ VAD_N_BANDS ];          /* Inverse noise energy level in each band                              */
    opus_int32                  NoiseLevelBias[ VAD_N_BANDS ];  /* Noise level estimator bias/offset                                    */
    opus_int32                  counter;                        /* Frame counter used in the initial phase                              */
} silk_VAD_state;

/* Variable cut-off low-pass filter state */
typedef struct {
    opus_int32                   In_LP_State[ 2 ];           /* Low pass filter state */
    opus_int32                   transition_frame_no;        /* Counter which is mapped to a cut-off frequency */
    opus_int                     mode;                       /* Operating mode, <0: switch down, >0: switch up; 0: do nothing           */
} silk_LP_state;

/* Structure containing NLSF codebook */
typedef struct {
    const opus_int16             nVectors;
    const opus_int16             order;
    const opus_int16             quantStepSize_Q16;
    const opus_int16             invQuantStepSize_Q6;
    const opus_uint8             *CB1_NLSF_Q8;
    const opus_int16             *CB1_Wght_Q9;
    const opus_uint8             *CB1_iCDF;
    const opus_uint8             *pred_Q8;
    const opus_uint8             *ec_sel;
    const opus_uint8             *ec_iCDF;
    const opus_uint8             *ec_Rates_Q5;
    const opus_int16             *deltaMin_Q15;
} silk_NLSF_CB_struct;

typedef struct {
    opus_int16                   pred_prev_Q13[ 2 ];
    opus_int16                   sMid[ 2 ];
    opus_int16                   sSide[ 2 ];
    opus_int32                   mid_side_amp_Q0[ 4 ];
    opus_int16                   smth_width_Q14;
    opus_int16                   width_prev_Q14;
    opus_int16                   silent_side_len;
    opus_int8                    predIx[ MAX_FRAMES_PER_PACKET ][ 2 ][ 3 ];
    opus_int8                    mid_only_flags[ MAX_FRAMES_PER_PACKET ];
} stereo_enc_state;

typedef struct {
    opus_int16                   pred_prev_Q13[ 2 ];
    opus_int16                   sMid[ 2 ];
    opus_int16                   sSide[ 2 ];
} stereo_dec_state;

typedef struct {
    opus_int8                    GainsIndices[ MAX_NB_SUBFR ];
    opus_int8                    LTPIndex[ MAX_NB_SUBFR ];
    opus_int8                    NLSFIndices[ MAX_LPC_ORDER + 1 ];
    opus_int16                   lagIndex;
    opus_int8                    contourIndex;
    opus_int8                    signalType;
    opus_int8                    quantOffsetType;
    opus_int8                    NLSFInterpCoef_Q2;
    opus_int8                    PERIndex;
    opus_int8                    LTP_scaleIndex;
    opus_int8                    Seed;
} SideInfoIndices;

/********************************/
/* Encoder state                */
/********************************/
typedef struct {
    opus_int32                   In_HP_State[ 2 ];                  /* High pass filter state                                           */
    opus_int32                   variable_HP_smth1_Q15;             /* State of first smoother                                          */
    opus_int32                   variable_HP_smth2_Q15;             /* State of second smoother                                         */
    silk_LP_state                sLP;                               /* Low pass filter state                                            */
    silk_VAD_state               sVAD;                              /* Voice activity detector state                                    */
    silk_nsq_state               sNSQ;                              /* Noise Shape Quantizer State                                      */
    opus_int16                   prev_NLSFq_Q15[ MAX_LPC_ORDER ];   /* Previously quantized NLSF vector                                 */
    opus_int                     speech_activity_Q8;                /* Speech activity                                                  */
    opus_int                     allow_bandwidth_switch;            /* Flag indicating that switching of internal bandwidth is allowed  */
    opus_int8                    LBRRprevLastGainIndex;
    opus_int8                    prevSignalType;
    opus_int                     prevLag;
    opus_int                     pitch_LPC_win_length;
    opus_int                     max_pitch_lag;                     /* Highest possible pitch lag (samples)                             */
    opus_int32                   API_fs_Hz;                         /* API sampling frequency (Hz)                                      */
    opus_int32                   prev_API_fs_Hz;                    /* Previous API sampling frequency (Hz)                             */
    opus_int                     maxInternal_fs_Hz;                 /* Maximum internal sampling frequency (Hz)                         */
    opus_int                     minInternal_fs_Hz;                 /* Minimum internal sampling frequency (Hz)                         */
    opus_int                     desiredInternal_fs_Hz;             /* Soft request for internal sampling frequency (Hz)                */
    opus_int                     fs_kHz;                            /* Internal sampling frequency (kHz)                                */
    opus_int                     nb_subfr;                          /* Number of 5 ms subframes in a frame                              */
    opus_int                     frame_length;                      /* Frame length (samples)                                           */
    opus_int                     subfr_length;                      /* Subframe length (samples)                                        */
    opus_int                     ltp_mem_length;                    /* Length of LTP memory                                             */
    opus_int                     la_pitch;                          /* Look-ahead for pitch analysis (samples)                          */
    opus_int                     la_shape;                          /* Look-ahead for noise shape analysis (samples)                    */
    opus_int                     shapeWinLength;                    /* Window length for noise shape analysis (samples)                 */
    opus_int32                   TargetRate_bps;                    /* Target bitrate (bps)                                             */
    opus_int                     PacketSize_ms;                     /* Number of milliseconds to put in each packet                     */
    opus_int                     PacketLoss_perc;                   /* Packet loss rate measured by farend                              */
    opus_int32                   frameCounter;
    opus_int                     Complexity;                        /* Complexity setting                                               */
    opus_int                     nStatesDelayedDecision;            /* Number of states in delayed decision quantization                */
    opus_int                     useInterpolatedNLSFs;              /* Flag for using NLSF interpolation                                */
    opus_int                     shapingLPCOrder;                   /* Filter order for noise shaping filters                           */
    opus_int                     predictLPCOrder;                   /* Filter order for prediction filters                              */
    opus_int                     pitchEstimationComplexity;         /* Complexity level for pitch estimator                             */
    opus_int                     pitchEstimationLPCOrder;           /* Whitening filter order for pitch estimator                       */
    opus_int32                   pitchEstimationThreshold_Q16;      /* Threshold for pitch estimator                                    */
    opus_int32                   sum_log_gain_Q7;                   /* Cumulative max prediction gain                                   */
    opus_int                     NLSF_MSVQ_Survivors;               /* Number of survivors in NLSF MSVQ                                 */
    opus_int                     first_frame_after_reset;           /* Flag for deactivating NLSF interpolation, pitch prediction       */
    opus_int                     controlled_since_last_payload;     /* Flag for ensuring codec_control only runs once per packet        */
    opus_int                     warping_Q16;                       /* Warping parameter for warped noise shaping                       */
    opus_int                     useCBR;                            /* Flag to enable constant bitrate                                  */
    opus_int                     prefillFlag;                       /* Flag to indicate that only buffers are prefilled, no coding      */
    const opus_uint8             *pitch_lag_low_bits_iCDF;          /* Pointer to iCDF table for low bits of pitch lag index            */
    const opus_uint8             *pitch_contour_iCDF;               /* Pointer to iCDF table for pitch contour index                    */
    const silk_NLSF_CB_struct    *psNLSF_CB;                        /* Pointer to NLSF codebook                                         */
    opus_int                     input_quality_bands_Q15[ VAD_N_BANDS ];
    opus_int                     input_tilt_Q15;
    opus_int                     SNR_dB_Q7;                         /* Quality setting                                                  */

    opus_int8                    VAD_flags[ MAX_FRAMES_PER_PACKET ];
    opus_int8                    LBRR_flag;
    opus_int                     LBRR_flags[ MAX_FRAMES_PER_PACKET ];

    SideInfoIndices              indices;
    opus_int8                    pulses[ MAX_FRAME_LENGTH ];

    int                          arch;

    /* Input/output buffering */
    opus_int16                   inputBuf[ MAX_FRAME_LENGTH + 2 ];  /* Buffer containing input signal                                   */
    opus_int                     inputBufIx;
    opus_int                     nFramesPerPacket;
    opus_int                     nFramesEncoded;                    /* Number of frames analyzed in current packet                      */

    opus_int                     nChannelsAPI;
    opus_int                     nChannelsInternal;
    opus_int                     channelNb;

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

    /* Specifically for entropy coding */
    opus_int                     ec_prevSignalType;
    opus_int16                   ec_prevLagIndex;

    silk_resampler_state_struct resampler_state;

    /* DTX */
    opus_int                     useDTX;                            /* Flag to enable DTX                                               */
    opus_int                     inDTX;                             /* Flag to signal DTX period                                        */
    opus_int                     noSpeechCounter;                   /* Counts concecutive nonactive frames, used by DTX                 */

    /* Inband Low Bitrate Redundancy (LBRR) data */
    opus_int                     useInBandFEC;                      /* Saves the API setting for query                                  */
    opus_int                     LBRR_enabled;                      /* Depends on useInBandFRC, bitrate and packet loss rate            */
    opus_int                     LBRR_GainIncreases;                /* Gains increment for coding LBRR frames                           */
    SideInfoIndices              indices_LBRR[ MAX_FRAMES_PER_PACKET ];
    opus_int8                    pulses_LBRR[ MAX_FRAMES_PER_PACKET ][ MAX_FRAME_LENGTH ];
} silk_encoder_state;


/* Struct for Packet Loss Concealment */
typedef struct {
    opus_int32                  pitchL_Q8;                          /* Pitch lag to use for voiced concealment                          */
    opus_int16                  LTPCoef_Q14[ LTP_ORDER ];           /* LTP coeficients to use for voiced concealment                    */
    opus_int16                  prevLPC_Q12[ MAX_LPC_ORDER ];
    opus_int                    last_frame_lost;                    /* Was previous frame lost                                          */
    opus_int32                  rand_seed;                          /* Seed for unvoiced signal generation                              */
    opus_int16                  randScale_Q14;                      /* Scaling of unvoiced random signal                                */
    opus_int32                  conc_energy;
    opus_int                    conc_energy_shift;
    opus_int16                  prevLTP_scale_Q14;
    opus_int32                  prevGain_Q16[ 2 ];
    opus_int                    fs_kHz;
    opus_int                    nb_subfr;
    opus_int                    subfr_length;
} silk_PLC_struct;

/* Struct for CNG */
typedef struct {
    opus_int32                  CNG_exc_buf_Q14[ MAX_FRAME_LENGTH ];
    opus_int16                  CNG_smth_NLSF_Q15[ MAX_LPC_ORDER ];
    opus_int32                  CNG_synth_state[ MAX_LPC_ORDER ];
    opus_int32                  CNG_smth_Gain_Q16;
    opus_int32                  rand_seed;
    opus_int                    fs_kHz;
} silk_CNG_struct;

/********************************/
/* Decoder state                */
/********************************/
typedef struct {
    opus_int32                  prev_gain_Q16;
    opus_int32                  exc_Q14[ MAX_FRAME_LENGTH ];
    opus_int32                  sLPC_Q14_buf[ MAX_LPC_ORDER ];
    opus_int16                  outBuf[ MAX_FRAME_LENGTH + 2 * MAX_SUB_FRAME_LENGTH ];  /* Buffer for output signal                     */
    opus_int                    lagPrev;                            /* Previous Lag                                                     */
    opus_int8                   LastGainIndex;                      /* Previous gain index                                              */
    opus_int                    fs_kHz;                             /* Sampling frequency in kHz                                        */
    opus_int32                  fs_API_hz;                          /* API sample frequency (Hz)                                        */
    opus_int                    nb_subfr;                           /* Number of 5 ms subframes in a frame                              */
    opus_int                    frame_length;                       /* Frame length (samples)                                           */
    opus_int                    subfr_length;                       /* Subframe length (samples)                                        */
    opus_int                    ltp_mem_length;                     /* Length of LTP memory                                             */
    opus_int                    LPC_order;                          /* LPC order                                                        */
    opus_int16                  prevNLSF_Q15[ MAX_LPC_ORDER ];      /* Used to interpolate LSFs                                         */
    opus_int                    first_frame_after_reset;            /* Flag for deactivating NLSF interpolation                         */
    const opus_uint8            *pitch_lag_low_bits_iCDF;           /* Pointer to iCDF table for low bits of pitch lag index            */
    const opus_uint8            *pitch_contour_iCDF;                /* Pointer to iCDF table for pitch contour index                    */

    /* For buffering payload in case of more frames per packet */
    opus_int                    nFramesDecoded;
    opus_int                    nFramesPerPacket;

    /* Specifically for entropy coding */
    opus_int                    ec_prevSignalType;
    opus_int16                  ec_prevLagIndex;

    opus_int                    VAD_flags[ MAX_FRAMES_PER_PACKET ];
    opus_int                    LBRR_flag;
    opus_int                    LBRR_flags[ MAX_FRAMES_PER_PACKET ];

    silk_resampler_state_struct resampler_state;

    const silk_NLSF_CB_struct   *psNLSF_CB;                         /* Pointer to NLSF codebook                                         */

    /* Quantization indices */
    SideInfoIndices             indices;

    /* CNG state */
    silk_CNG_struct             sCNG;

    /* Stuff used for PLC */
    opus_int                    lossCnt;
    opus_int                    prevSignalType;
    int                         arch;

    silk_PLC_struct sPLC;

} silk_decoder_state;

/************************/
/* Decoder control      */
/************************/
typedef struct {
    /* Prediction and coding parameters */
    opus_int                    pitchL[ MAX_NB_SUBFR ];
    opus_int32                  Gains_Q16[ MAX_NB_SUBFR ];
    /* Holds interpolated and final coefficients, 4-byte aligned */
    silk_DWORD_ALIGN opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
    opus_int16                  LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ];
    opus_int                    LTP_scale_Q14;
} silk_decoder_control;


#ifdef __cplusplus
}
#endif

#endif