godot/drivers/opus/silk/init_encoder.c

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#include "opus/opus_config.h"
#ifdef OPUS_FIXED_POINT
#include "opus/silk/fixed/main_FIX.h"
#else
#include "opus/silk/float/main_FLP.h"
#endif
#include "opus/silk/tuning_parameters.h"
#include "opus/celt/cpu_support.h"

/*********************************/
/* Initialize Silk Encoder state */
/*********************************/
opus_int silk_init_encoder(
    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
    int                              arch                                   /* I    Run-time architecture                                                       */
)
{
    opus_int ret = 0;

    /* Clear the entire encoder state */
    silk_memset( psEnc, 0, sizeof( silk_encoder_state_Fxx ) );

    psEnc->sCmn.arch = arch;

    psEnc->sCmn.variable_HP_smth1_Q15 = silk_LSHIFT( silk_lin2log( SILK_FIX_CONST( VARIABLE_HP_MIN_CUTOFF_HZ, 16 ) ) - ( 16 << 7 ), 8 );
    psEnc->sCmn.variable_HP_smth2_Q15 = psEnc->sCmn.variable_HP_smth1_Q15;

    /* Used to deactivate LSF interpolation, pitch prediction */
    psEnc->sCmn.first_frame_after_reset = 1;

    /* Initialize Silk VAD */
    ret += silk_VAD_Init( &psEnc->sCmn.sVAD );

    return  ret;
}