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#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "main.h"

/* 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)                 */

)

{

    opus_int frame_length, ret = 0;

    celt_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );

    celt_assert( psDec->nb_subfr == MAX_NB_SUBFR || psDec->nb_subfr == MAX_NB_SUBFR/2 );

    /* New (sub)frame length */

    psDec->subfr_length = silk_SMULBB( SUB_FRAME_LENGTH_MS, fs_kHz );

    frame_length = silk_SMULBB( psDec->nb_subfr, psDec->subfr_length );

    /* Initialize resampler when switching internal or external sampling frequency */

    if( psDec->fs_kHz != fs_kHz || psDec->fs_API_hz != fs_API_Hz ) {

        /* Initialize the resampler for dec_API.c preparing resampling from fs_kHz to API_fs_Hz */

        ret += silk_resampler_init( &psDec->resampler_state, silk_SMULBB( fs_kHz, 1000 ), fs_API_Hz, 0 );

        psDec->fs_API_hz = fs_API_Hz;

    }

    if( psDec->fs_kHz != fs_kHz || frame_length != psDec->frame_length ) {

        if( fs_kHz == 8 ) {

            if( psDec->nb_subfr == MAX_NB_SUBFR ) {

                psDec->pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;

            } else {

                psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;

            }

        } else {

            if( psDec->nb_subfr == MAX_NB_SUBFR ) {

                psDec->pitch_contour_iCDF = silk_pitch_contour_iCDF;

            } else {

                psDec->pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;

            }

        }

        if( psDec->fs_kHz != fs_kHz ) {

            psDec->ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );

            if( fs_kHz == 8 || fs_kHz == 12 ) {

                psDec->LPC_order = MIN_LPC_ORDER;

                psDec->psNLSF_CB = &silk_NLSF_CB_NB_MB;

            } else {

                psDec->LPC_order = MAX_LPC_ORDER;

                psDec->psNLSF_CB = &silk_NLSF_CB_WB;

            }

            if( fs_kHz == 16 ) {

                psDec->pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;

            } else if( fs_kHz == 12 ) {

                psDec->pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;

            } else if( fs_kHz == 8 ) {

                psDec->pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;

            } else {

                /* unsupported sampling rate */

                celt_assert( 0 );

            }

            psDec->first_frame_after_reset = 1;

            psDec->lagPrev                 = 100;

            psDec->LastGainIndex           = 10;

            psDec->prevSignalType          = TYPE_NO_VOICE_ACTIVITY;

            silk_memset( psDec->outBuf, 0, sizeof(psDec->outBuf));

            silk_memset( psDec->sLPC_Q14_buf, 0, sizeof(psDec->sLPC_Q14_buf) );

        }

        psDec->fs_kHz       = fs_kHz;

        psDec->frame_length = frame_length;

    }

    /* Check that settings are valid */

    celt_assert( psDec->frame_length > 0 && psDec->frame_length <= MAX_FRAME_LENGTH );

    return ret;

}