silk/silk_resampler_structs.h

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#ifndef SILK_RESAMPLER_STRUCTS_H
#define SILK_RESAMPLER_STRUCTS_H

#ifdef __cplusplus
extern "C" {
#endif

/* Flag to enable support for input/output sampling rates above 48 kHz. Turn off for embedded devices */
#define RESAMPLER_SUPPORT_ABOVE_48KHZ                1

#define SILK_RESAMPLER_MAX_FIR_ORDER                 16
#define SILK_RESAMPLER_MAX_IIR_ORDER                 6


typedef struct _silk_resampler_state_struct{
    opus_int32       sIIR[ SILK_RESAMPLER_MAX_IIR_ORDER ];        /* this must be the first element of this struct */
    opus_int32       sFIR[ SILK_RESAMPLER_MAX_FIR_ORDER ];
    opus_int32       sDown2[ 2 ];
    void            (*resampler_function)( void *, opus_int16 *, const opus_int16 *, opus_int32 );
    void            (*up2_function)(  opus_int32 *, opus_int16 *, const opus_int16 *, opus_int32 );
    opus_int32       batchSize;
    opus_int32       invRatio_Q16;
    opus_int32       FIR_Fracs;
    opus_int32       input2x;
    const opus_int16    *Coefs;
#if RESAMPLER_SUPPORT_ABOVE_48KHZ
    opus_int32       sDownPre[ 2 ];
    opus_int32       sUpPost[ 2 ];
    void            (*down_pre_function)( opus_int32 *, opus_int16 *, const opus_int16 *, opus_int32 );
    void            (*up_post_function)(  opus_int32 *, opus_int16 *, const opus_int16 *, opus_int32 );
    opus_int32       batchSizePrePost;
    opus_int32       ratio_Q16;
    opus_int32       nPreDownsamplers;
    opus_int32       nPostUpsamplers;
#endif
    opus_int32 magic_number;
} silk_resampler_state_struct;

#ifdef __cplusplus
}
#endif
#endif // SILK_RESAMPLER_STRUCTS_H