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are permitted provided that the following conditions are met:
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***********************************************************************/


#include "SKP_Silk_define.h"
#include "SKP_Silk_main_FIX.h"
#include "SKP_Silk_SDK_API.h"
#include "SKP_Silk_control.h"
#include "SKP_Silk_typedef.h"
#include "SKP_Silk_structs.h"
#define SKP_Silk_EncodeControlStruct SKP_SILK_SDK_EncControlStruct

/****************************************/
/* Encoder functions                    */
/****************************************/

SKP_int SKP_Silk_SDK_Get_Encoder_Size( SKP_int32 *encSizeBytes )
{
    SKP_int ret = 0;
    
    *encSizeBytes = sizeof( SKP_Silk_encoder_state_FIX );
    
    return ret;
}


/***************************************/
/* Read control structure from encoder */
/***************************************/
SKP_int SKP_Silk_SDK_QueryEncoder(
    const void *encState,                       /* I:   State Vector                                    */
    SKP_Silk_EncodeControlStruct *encStatus     /* O:   Control Structure                               */
)
{
    SKP_Silk_encoder_state_FIX *psEnc;
    SKP_int ret = 0;    

    psEnc = ( SKP_Silk_encoder_state_FIX* )encState;

    encStatus->API_sampleRate        = psEnc->sCmn.API_fs_Hz;
    encStatus->maxInternalSampleRate = SKP_SMULBB( psEnc->sCmn.maxInternal_fs_kHz, 1000 );
    encStatus->packetSize            = ( SKP_int )SKP_DIV32_16( psEnc->sCmn.API_fs_Hz * psEnc->sCmn.PacketSize_ms, 1000 );  /* convert samples -> ms */
    encStatus->bitRate               = psEnc->sCmn.TargetRate_bps;
    encStatus->packetLossPercentage  = psEnc->sCmn.PacketLoss_perc;
    encStatus->complexity            = psEnc->sCmn.Complexity;
    encStatus->useInBandFEC          = psEnc->sCmn.useInBandFEC;
    encStatus->useDTX                = psEnc->sCmn.useDTX;
    return ret;
}

/*************************/
/* Init or Reset encoder */
/*************************/
SKP_int SKP_Silk_SDK_InitEncoder(
    void                            *encState,          /* I/O: State                                           */
    SKP_Silk_EncodeControlStruct    *encStatus          /* O:   Control structure                               */
)
{
    SKP_Silk_encoder_state_FIX *psEnc;
    SKP_int ret = 0;

        
    psEnc = ( SKP_Silk_encoder_state_FIX* )encState;

    /* Reset Encoder */
    if( ret += SKP_Silk_init_encoder_FIX( psEnc ) ) {
        SKP_assert( 0 );
    }

    /* Read control structure */
    if( ret += SKP_Silk_SDK_QueryEncoder( encState, encStatus ) ) {
        SKP_assert( 0 );
    }


    return ret;
}

/**************************/
/* Encode frame with Silk */
/**************************/
SKP_int SKP_Silk_SDK_Encode( 
    void                                *encState,      /* I/O: State                                           */
    const SKP_Silk_EncodeControlStruct  *encControl,    /* I:   Control structure                               */
    const SKP_int16                     *samplesIn,     /* I:   Speech sample input vector                      */
    SKP_int                             nSamplesIn,     /* I:   Number of samples in input vector               */
    SKP_uint8                           *outData,       /* O:   Encoded output vector                           */
    SKP_int16                           *nBytesOut      /* I/O: Number of bytes in outData (input: Max bytes)   */
)
{
    SKP_int   max_internal_fs_kHz, PacketSize_ms, PacketLoss_perc, UseInBandFEC, UseDTX, ret = 0;
    SKP_int   nSamplesToBuffer, Complexity, input_ms, nSamplesFromInput = 0;
    SKP_int32 TargetRate_bps, API_fs_Hz;
    SKP_int16 MaxBytesOut;
    SKP_Silk_encoder_state_FIX *psEnc = ( SKP_Silk_encoder_state_FIX* )encState;

    SKP_assert( encControl != NULL );

    /* Check sampling frequency first, to avoid divide by zero later */
    if( ( ( encControl->API_sampleRate        !=  8000 ) &&
          ( encControl->API_sampleRate        != 12000 ) &&
          ( encControl->API_sampleRate        != 16000 ) &&
          ( encControl->API_sampleRate        != 24000 ) && 
          ( encControl->API_sampleRate        != 32000 ) &&
          ( encControl->API_sampleRate        != 44100 ) &&
          ( encControl->API_sampleRate        != 48000 ) ) ||
        ( ( encControl->maxInternalSampleRate !=  8000 ) &&
          ( encControl->maxInternalSampleRate != 12000 ) &&
          ( encControl->maxInternalSampleRate != 16000 ) &&
          ( encControl->maxInternalSampleRate != 24000 ) ) ) {
        ret = SKP_SILK_ENC_FS_NOT_SUPPORTED;
        SKP_assert( 0 );
        return( ret );
    }

    /* Set encoder parameters from control structure */
    API_fs_Hz           =                              encControl->API_sampleRate;
    max_internal_fs_kHz = SKP_DIV32_16(     ( SKP_int )encControl->maxInternalSampleRate, 1000 );   /* convert Hz -> kHz */
    PacketSize_ms       = SKP_DIV32( 1000 * ( SKP_int )encControl->packetSize, API_fs_Hz );
    TargetRate_bps      =                 ( SKP_int32 )encControl->bitRate;
    PacketLoss_perc     =                   ( SKP_int )encControl->packetLossPercentage;
    UseInBandFEC        =                   ( SKP_int )encControl->useInBandFEC;
    Complexity          =                   ( SKP_int )encControl->complexity;
    UseDTX              =                   ( SKP_int )encControl->useDTX;
    /* Save values in state */
    psEnc->sCmn.API_fs_Hz          = API_fs_Hz;
    psEnc->sCmn.maxInternal_fs_kHz = max_internal_fs_kHz;
    psEnc->sCmn.useInBandFEC       = UseInBandFEC;

    /* Only accept input lengths that are a multiplum of 10 ms */
    input_ms = SKP_DIV32( 1000 * nSamplesIn, API_fs_Hz );
    if( ( input_ms % 10) != 0 || nSamplesIn < 0 ) {
        ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
        SKP_assert( 0 );
        return( ret );
    }

    /* Make sure no more than one packet can be produced */
    if( nSamplesIn > SKP_DIV32_16( psEnc->sCmn.PacketSize_ms * API_fs_Hz, 1000 ) ) {
        ret = SKP_SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES;
        SKP_assert( 0 );
        return( ret );
    }
    if( ( ret = SKP_Silk_control_encoder_FIX( psEnc, API_fs_Hz, max_internal_fs_kHz, PacketSize_ms, TargetRate_bps, 
                    PacketLoss_perc, UseInBandFEC, UseDTX, input_ms, Complexity) ) != 0 ) {
        SKP_assert( 0 );
        return( ret );
    }
    /* Detect energy above 8 kHz */
    if( SKP_min( API_fs_Hz, 1000 * max_internal_fs_kHz ) == 24000 && psEnc->sCmn.sSWBdetect.SWB_detected == 0 && psEnc->sCmn.sSWBdetect.WB_detected == 0 ) {
        SKP_Silk_detect_SWB_input( &psEnc->sCmn.sSWBdetect, samplesIn, ( SKP_int )nSamplesIn );
    }

    /* Input buffering/resampling and encoding */
    MaxBytesOut = 0;                    /* return 0 output bytes if no encoder called */
    while( 1 ) {
        nSamplesToBuffer = psEnc->sCmn.frame_length - psEnc->sCmn.inputBufIx;
        if( API_fs_Hz == SKP_SMULBB( 1000, psEnc->sCmn.fs_kHz ) ) { 
            nSamplesToBuffer  = SKP_min_int( nSamplesToBuffer, nSamplesIn );
            nSamplesFromInput = nSamplesToBuffer;
            /* Copy to buffer */
            SKP_memcpy( &psEnc->sCmn.inputBuf[ psEnc->sCmn.inputBufIx ], samplesIn, nSamplesFromInput * sizeof( SKP_int16 ) );
        } else {  
            nSamplesToBuffer  = SKP_min( nSamplesToBuffer, SKP_DIV32( ( SKP_int32 )nSamplesIn * psEnc->sCmn.fs_kHz * 1000, API_fs_Hz ) );
            nSamplesFromInput = SKP_DIV32_16( nSamplesToBuffer * API_fs_Hz, psEnc->sCmn.fs_kHz * 1000 );
            /* Resample and write to buffer */
            ret += SKP_Silk_resampler( &psEnc->sCmn.resampler_state, &psEnc->sCmn.inputBuf[ psEnc->sCmn.inputBufIx ], samplesIn, nSamplesFromInput );
        } 
        samplesIn              += nSamplesFromInput;
        nSamplesIn             -= nSamplesFromInput;
        psEnc->sCmn.inputBufIx += nSamplesToBuffer;

        /* Silk encoder */
        if( psEnc->sCmn.inputBufIx >= psEnc->sCmn.frame_length ) {
            /* Enough data in input buffer, so encode */
            if( MaxBytesOut == 0 ) {
                /* No payload obtained so far */
                MaxBytesOut = *nBytesOut;
                if( ( ret = SKP_Silk_encode_frame_FIX( psEnc, outData, &MaxBytesOut, psEnc->sCmn.inputBuf ) ) != 0 ) {
                    SKP_assert( 0 );
                }
            } else {
                /* outData already contains a payload */
                if( ( ret = SKP_Silk_encode_frame_FIX( psEnc, outData, nBytesOut, psEnc->sCmn.inputBuf ) ) != 0 ) {
                    SKP_assert( 0 );
                }
                /* Check that no second payload was created */
                SKP_assert( *nBytesOut == 0 );
            }
            psEnc->sCmn.inputBufIx = 0;
        } else {
            break;
        }
    }

    *nBytesOut = MaxBytesOut;
    if( psEnc->sCmn.useDTX && psEnc->sCmn.inDTX ) {
        /* DTX simulation */
        *nBytesOut = 0;
    }


    return ret;
}

