freeswitch/libs/silk/src/SKP_Silk_setup_complexity.h

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#include "SKP_Silk_main.h"
#include "SKP_Silk_tuning_parameters.h"

SKP_INLINE SKP_int SKP_Silk_setup_complexity(
    SKP_Silk_encoder_state          *psEncC,            /* I/O  Pointer to Silk encoder state           */
    SKP_int                         Complexity          /* I    Complexity (0->low; 1->medium; 2->high) */
)
{
    SKP_int ret = SKP_SILK_NO_ERROR;

    /* Check that settings are valid */
    if( LOW_COMPLEXITY_ONLY && Complexity != 0 ) {
        ret = SKP_SILK_ENC_INVALID_COMPLEXITY_SETTING;
    }

    /* Set encoding complexity */
    if( Complexity == 0 || LOW_COMPLEXITY_ONLY ) {
        /* Low complexity */
        psEncC->Complexity                      = 0;
        psEncC->pitchEstimationComplexity       = PITCH_EST_COMPLEXITY_LC_MODE;
        psEncC->pitchEstimationThreshold_Q16    = SKP_FIX_CONST( FIND_PITCH_CORRELATION_THRESHOLD_LC_MODE, 16 );
        psEncC->pitchEstimationLPCOrder         = 6;
        psEncC->shapingLPCOrder                 = 8;
        psEncC->la_shape                        = 3 * psEncC->fs_kHz;
        psEncC->nStatesDelayedDecision          = 1;
        psEncC->useInterpolatedNLSFs            = 0;
        psEncC->LTPQuantLowComplexity           = 1;
        psEncC->NLSF_MSVQ_Survivors             = MAX_NLSF_MSVQ_SURVIVORS_LC_MODE;
        psEncC->warping_Q16                     = 0;
    } else if( Complexity == 1 ) {
        /* Medium complexity */
        psEncC->Complexity                      = 1;
        psEncC->pitchEstimationComplexity       = PITCH_EST_COMPLEXITY_MC_MODE;
        psEncC->pitchEstimationThreshold_Q16    = SKP_FIX_CONST( FIND_PITCH_CORRELATION_THRESHOLD_MC_MODE, 16 );
        psEncC->pitchEstimationLPCOrder         = 12;
        psEncC->shapingLPCOrder                 = 12;
        psEncC->la_shape                        = 5 * psEncC->fs_kHz;
        psEncC->nStatesDelayedDecision          = 2;
        psEncC->useInterpolatedNLSFs            = 0;
        psEncC->LTPQuantLowComplexity           = 0;
        psEncC->NLSF_MSVQ_Survivors             = MAX_NLSF_MSVQ_SURVIVORS_MC_MODE;
        psEncC->warping_Q16                     = psEncC->fs_kHz * SKP_FIX_CONST( WARPING_MULTIPLIER, 16 );
    } else if( Complexity == 2 ) {
        /* High complexity */
        psEncC->Complexity                      = 2;
        psEncC->pitchEstimationComplexity       = PITCH_EST_COMPLEXITY_HC_MODE;
        psEncC->pitchEstimationThreshold_Q16    = SKP_FIX_CONST( FIND_PITCH_CORRELATION_THRESHOLD_HC_MODE, 16 );
        psEncC->pitchEstimationLPCOrder         = 16;
        psEncC->shapingLPCOrder                 = 16;
        psEncC->la_shape                        = 5 * psEncC->fs_kHz;
        psEncC->nStatesDelayedDecision          = MAX_DEL_DEC_STATES;
        psEncC->useInterpolatedNLSFs            = 1;
        psEncC->LTPQuantLowComplexity           = 0;
        psEncC->NLSF_MSVQ_Survivors             = MAX_NLSF_MSVQ_SURVIVORS;
        psEncC->warping_Q16                     = psEncC->fs_kHz * SKP_FIX_CONST( WARPING_MULTIPLIER, 16 );
    } else {
        ret = SKP_SILK_ENC_INVALID_COMPLEXITY_SETTING;
    }

    /* Do not allow higher pitch estimation LPC order than predict LPC order */
    psEncC->pitchEstimationLPCOrder             = SKP_min_int( psEncC->pitchEstimationLPCOrder, psEncC->predictLPCOrder );
    psEncC->shapeWinLength                      = 5 * psEncC->fs_kHz + 2 * psEncC->la_shape;

    SKP_assert( psEncC->pitchEstimationLPCOrder <= MAX_FIND_PITCH_LPC_ORDER );
    SKP_assert( psEncC->shapingLPCOrder         <= MAX_SHAPE_LPC_ORDER      );
    SKP_assert( psEncC->nStatesDelayedDecision  <= MAX_DEL_DEC_STATES       );
    SKP_assert( psEncC->warping_Q16             <= 32767                    );
    SKP_assert( psEncC->la_shape                <= LA_SHAPE_MAX             );
    SKP_assert( psEncC->shapeWinLength          <= SHAPE_LPC_WIN_MAX        );

    return( ret );
}