xref: /external/chromium_org/third_party/opus/src/silk/main.h

/***********************************************************************
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#ifndef SILK_MAIN_H
#define SILK_MAIN_H

#include "SigProc_FIX.h"
#include "define.h"
#include "structs.h"
#include "tables.h"
#include "PLC.h"
#include "control.h"
#include "debug.h"
#include "entenc.h"
#include "entdec.h"

/* Convert Left/Right stereo signal to adaptive Mid/Side representation */
void silk_stereo_LR_to_MS(
    stereo_enc_state            *state,                         /* I/O  State                                       */
    opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
    opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
    opus_int8                   ix[ 2 ][ 3 ],                   /* O    Quantization indices                        */
    opus_int8                   *mid_only_flag,                 /* O    Flag: only mid signal coded                 */
    opus_int32                  mid_side_rates_bps[],           /* O    Bitrates for mid and side signals           */
    opus_int32                  total_rate_bps,                 /* I    Total bitrate                               */
    opus_int                    prev_speech_act_Q8,             /* I    Speech activity level in previous frame     */
    opus_int                    toMono,                         /* I    Last frame before a stereo->mono transition */
    opus_int                    fs_kHz,                         /* I    Sample rate (kHz)                           */
    opus_int                    frame_length                    /* I    Number of samples                           */
);

/* Convert adaptive Mid/Side representation to Left/Right stereo signal */
void silk_stereo_MS_to_LR(
    stereo_dec_state            *state,                         /* I/O  State                                       */
    opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
    opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
    const opus_int32            pred_Q13[],                     /* I    Predictors                                  */
    opus_int                    fs_kHz,                         /* I    Samples rate (kHz)                          */
    opus_int                    frame_length                    /* I    Number of samples                           */
);

/* Find least-squares prediction gain for one signal based on another and quantize it */
opus_int32 silk_stereo_find_predictor(                          /* O    Returns predictor in Q13                    */
    opus_int32                  *ratio_Q14,                     /* O    Ratio of residual and mid energies          */
    const opus_int16            x[],                            /* I    Basis signal                                */
    const opus_int16            y[],                            /* I    Target signal                               */
    opus_int32                  mid_res_amp_Q0[],               /* I/O  Smoothed mid, residual norms                */
    opus_int                    length,                         /* I    Number of samples                           */
    opus_int                    smooth_coef_Q16                 /* I    Smoothing coefficient                       */
);

/* Quantize mid/side predictors */
void silk_stereo_quant_pred(
    opus_int32                  pred_Q13[],                     /* I/O  Predictors (out: quantized)                 */
    opus_int8                   ix[ 2 ][ 3 ]                    /* O    Quantization indices                        */
);

/* Entropy code the mid/side quantization indices */
void silk_stereo_encode_pred(
    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
    opus_int8                   ix[ 2 ][ 3 ]                    /* I    Quantization indices                        */
);

/* Entropy code the mid-only flag */
void silk_stereo_encode_mid_only(
    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
    opus_int8                   mid_only_flag
);

/* Decode mid/side predictors */
void silk_stereo_decode_pred(
    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
    opus_int32                  pred_Q13[]                      /* O    Predictors                                  */
);

/* Decode mid-only flag */
void silk_stereo_decode_mid_only(
    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
    opus_int                    *decode_only_mid                /* O    Flag that only mid channel has been coded   */
);

/* Encodes signs of excitation */
void silk_encode_signs(
    ec_enc                      *psRangeEnc,                        /* I/O  Compressor data structure                   */
    const opus_int8             pulses[],                           /* I    pulse signal                                */
    opus_int                    length,                             /* I    length of input                             */
    const opus_int              signalType,                         /* I    Signal type                                 */
    const opus_int              quantOffsetType,                    /* I    Quantization offset type                    */
    const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
);

/* Decodes signs of excitation */
void silk_decode_signs(
    ec_dec                      *psRangeDec,                        /* I/O  Compressor data structure                   */
    opus_int                    pulses[],                           /* I/O  pulse signal                                */
    opus_int                    length,                             /* I    length of input                             */
    const opus_int              signalType,                         /* I    Signal type                                 */
    const opus_int              quantOffsetType,                    /* I    Quantization offset type                    */
    const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
);

/* Check encoder control struct */
opus_int check_control_input(
    silk_EncControlStruct        *encControl                    /* I    Control structure                           */
);

/* Control internal sampling rate */
opus_int silk_control_audio_bandwidth(
    silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
    silk_EncControlStruct       *encControl                     /* I    Control structure                           */
);

/* Control SNR of redidual quantizer */
opus_int silk_control_SNR(
    silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
    opus_int32                  TargetRate_bps                  /* I    Target max bitrate (bps)                    */
);

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

/* Encode quantization indices of excitation */
void silk_encode_pulses(
    ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
    const opus_int              signalType,                     /* I    Signal type                                 */
    const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
    opus_int8                   pulses[],                       /* I    quantization indices                        */
    const opus_int              frame_length                    /* I    Frame length                                */
);

/* Shell encoder, operates on one shell code frame of 16 pulses */
void silk_shell_encoder(
    ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
    const opus_int              *pulses0                        /* I    data: nonnegative pulse amplitudes          */
);

/* Shell decoder, operates on one shell code frame of 16 pulses */
void silk_shell_decoder(
    opus_int                    *pulses0,                       /* O    data: nonnegative pulse amplitudes          */
    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
    const opus_int              pulses4                         /* I    number of pulses per pulse-subframe         */
);

/* Gain scalar quantization with hysteresis, uniform on log scale */
void silk_gains_quant(
    opus_int8                   ind[ MAX_NB_SUBFR ],            /* O    gain indices                                */
    opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* I/O  gains (quantized out)                       */
    opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
    const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
    const opus_int              nb_subfr                        /* I    number of subframes                         */
);

/* Gains scalar dequantization, uniform on log scale */
void silk_gains_dequant(
    opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* O    quantized gains                             */
    const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
    opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
    const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
    const opus_int              nb_subfr                        /* I    number of subframes                          */
);

/* Compute unique identifier of gain indices vector */
opus_int32 silk_gains_ID(                                       /* O    returns unique identifier of gains          */
    const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
    const opus_int              nb_subfr                        /* I    number of subframes                         */
);

/* Interpolate two vectors */
void silk_interpolate(
    opus_int16                  xi[ MAX_LPC_ORDER ],            /* O    interpolated vector                         */
    const opus_int16            x0[ MAX_LPC_ORDER ],            /* I    first vector                                */
    const opus_int16            x1[ MAX_LPC_ORDER ],            /* I    second vector                               */
    const opus_int              ifact_Q2,                       /* I    interp. factor, weight on 2nd vector        */
    const opus_int              d                               /* I    number of parameters                        */
);

/* LTP tap quantizer */
void silk_quant_LTP_gains(
    opus_int16                  B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],          /* I/O  (un)quantized LTP gains         */
    opus_int8                   cbk_index[ MAX_NB_SUBFR ],                  /* O    Codebook Index                  */
    opus_int8                   *periodicity_index,                         /* O    Periodicity Index               */
	opus_int32					*sum_gain_dB_Q7,							/* I/O  Cumulative max prediction gain  */
    const opus_int32            W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ],  /* I    Error Weights in Q18            */
    opus_int                    mu_Q9,                                      /* I    Mu value (R/D tradeoff)         */
    opus_int                    lowComplexity,                              /* I    Flag for low complexity         */
    const opus_int              nb_subfr                                    /* I    number of subframes             */
);

/* Entropy constrained matrix-weighted VQ, for a single input data vector */
void silk_VQ_WMat_EC(
    opus_int8                   *ind,                           /* O    index of best codebook vector               */
    opus_int32                  *rate_dist_Q14,                 /* O    best weighted quant error + mu * rate       */
    opus_int                    *gain_Q7,                       /* O    sum of absolute LTP coefficients            */
    const opus_int16            *in_Q14,                        /* I    input vector to be quantized                */
    const opus_int32            *W_Q18,                         /* I    weighting matrix                            */
    const opus_int8             *cb_Q7,                         /* I    codebook                                    */
    const opus_uint8            *cb_gain_Q7,                    /* I    codebook effective gain                     */
    const opus_uint8            *cl_Q5,                         /* I    code length for each codebook vector        */
    const opus_int              mu_Q9,                          /* I    tradeoff betw. weighted error and rate      */
    const opus_int32            max_gain_Q7,                    /* I    maximum sum of absolute LTP coefficients    */
    opus_int                    L                               /* I    number of vectors in codebook               */
);

/************************************/
/* Noise shaping quantization (NSQ) */
/************************************/
void silk_NSQ(
    const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
    silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
    SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
    const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
    opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
    const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
    const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
    const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
    const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
    const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
    const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
    const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
    const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
    const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
    const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
);

/* Noise shaping using delayed decision */
void silk_NSQ_del_dec(
    const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
    silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
    SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
    const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
    opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
    const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
    const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
    const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
    const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
    const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
    const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
    const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
    const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
    const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
    const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
);

/************/
/* Silk VAD */
/************/
/* Initialize the Silk VAD */
opus_int silk_VAD_Init(                                         /* O    Return value, 0 if success                  */
    silk_VAD_state              *psSilk_VAD                     /* I/O  Pointer to Silk VAD state                   */
);

/* Get speech activity level in Q8 */
opus_int silk_VAD_GetSA_Q8(                                     /* O    Return value, 0 if success                  */
    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
    const opus_int16            pIn[]                           /* I    PCM 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 silk_LP_variable_cutoff(
    silk_LP_state               *psLP,                          /* I/O  LP filter state                             */
    opus_int16                  *frame,                         /* I/O  Low-pass filtered output signal             */
    const opus_int              frame_length                    /* I    Frame length                                */
);

/******************/
/* NLSF Quantizer */
/******************/
/* Limit, stabilize, convert and quantize NLSFs */
void silk_process_NLSFs(
    silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
    opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
    opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
    const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
);

opus_int32 silk_NLSF_encode(                                    /* O    Returns RD value in Q25                     */
          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
          opus_int16            *pNLSF_Q15,                     /* I/O  Quantized NLSF vector [ LPC_ORDER ]         */
    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
    const opus_int16            *pW_QW,                         /* I    NLSF weight vector [ LPC_ORDER ]            */
    const opus_int              NLSF_mu_Q20,                    /* I    Rate weight for the RD optimization         */
    const opus_int              nSurvivors,                     /* I    Max survivors after first stage             */
    const opus_int              signalType                      /* I    Signal type: 0/1/2                          */
);

/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
void silk_NLSF_VQ(
    opus_int32                  err_Q26[],                      /* O    Quantization errors [K]                     */
    const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
    const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
    const opus_int              K,                              /* I    Number of codebook vectors                  */
    const opus_int              LPC_order                       /* I    Number of LPCs                              */
);

/* Delayed-decision quantizer for NLSF residuals */
opus_int32 silk_NLSF_del_dec_quant(                             /* O    Returns RD value in Q25                     */
    opus_int8                   indices[],                      /* O    Quantization indices [ order ]              */
    const opus_int16            x_Q10[],                        /* I    Input [ order ]                             */
    const opus_int16            w_Q5[],                         /* I    Weights [ order ]                           */
    const opus_uint8            pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
    const opus_int16            ec_ix[],                        /* I    Indices to entropy coding tables [ order ]  */
    const opus_uint8            ec_rates_Q5[],                  /* I    Rates []                                    */
    const opus_int              quant_step_size_Q16,            /* I    Quantization step size                      */
    const opus_int16            inv_quant_step_size_Q6,         /* I    Inverse quantization step size              */
    const opus_int32            mu_Q20,                         /* I    R/D tradeoff                                */
    const opus_int16            order                           /* I    Number of input values                      */
);

/* Unpack predictor values and indices for entropy coding tables */
void silk_NLSF_unpack(
          opus_int16            ec_ix[],                        /* O    Indices to entropy tables [ LPC_ORDER ]     */
          opus_uint8            pred_Q8[],                      /* O    LSF predictor [ LPC_ORDER ]                 */
    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
    const opus_int              CB1_index                       /* I    Index of vector in first LSF codebook       */
);

/***********************/
/* NLSF vector decoder */
/***********************/
void silk_NLSF_decode(
          opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
    const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
);

/****************************************************/
/* Decoder Functions                                */
/****************************************************/
opus_int silk_init_decoder(
    silk_decoder_state          *psDec                          /* I/O  Decoder state pointer                       */
);

/* Set decoder sampling rate */
opus_int silk_decoder_set_fs(
    silk_decoder_state          *psDec,                         /* I/O  Decoder state pointer                       */
    opus_int                    fs_kHz,                         /* I    Sampling frequency (kHz)                    */
    opus_int32                  fs_API_Hz                       /* I    API Sampling frequency (Hz)                 */
);

/****************/
/* Decode frame */
/****************/
opus_int silk_decode_frame(
    silk_decoder_state          *psDec,                         /* I/O  Pointer to Silk decoder state               */
    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
    opus_int16                  pOut[],                         /* O    Pointer to output speech frame              */
    opus_int32                  *pN,                            /* O    Pointer to size of output frame             */
    opus_int                    lostFlag,                       /* I    0: no loss, 1 loss, 2 decode fec            */
    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
);

/* Decode indices from bitstream */
void silk_decode_indices(
    silk_decoder_state          *psDec,                         /* I/O  State                                       */
    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
    opus_int                    FrameIndex,                     /* I    Frame number                                */
    opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
);

/* Decode parameters from payload */
void silk_decode_parameters(
    silk_decoder_state          *psDec,                         /* I/O  State                                       */
    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
);

/* Core decoder. Performs inverse NSQ operation LTP + LPC */
void silk_decode_core(
    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
    silk_decoder_control        *psDecCtrl,                     /* I    Decoder control                             */
    opus_int16                  xq[],                           /* O    Decoded speech                              */
    const opus_int              pulses[ MAX_FRAME_LENGTH ]      /* I    Pulse signal                                */
);

/* Decode quantization indices of excitation (Shell coding) */
void silk_decode_pulses(
    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
    opus_int                    pulses[],                       /* O    Excitation signal                           */
    const opus_int              signalType,                     /* I    Sigtype                                     */
    const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
    const opus_int              frame_length                    /* I    Frame length                                */
);

/******************/
/* CNG */
/******************/

/* Reset CNG */
void silk_CNG_Reset(
    silk_decoder_state          *psDec                          /* I/O  Decoder state                               */
);

/* Updates CNG estimate, and applies the CNG when packet was lost */
void silk_CNG(
    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
    opus_int16                  frame[],                        /* I/O  Signal                                      */
    opus_int                    length                          /* I    Length of residual                          */
);

/* Encoding of various parameters */
void silk_encode_indices(
    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
    opus_int                    FrameIndex,                     /* I    Frame number                                */
    opus_int                    encode_LBRR,                    /* I    Flag indicating LBRR data is being encoded  */
    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
);

#endif