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/* * | |
* File Name: SKP_Silk_resampler_structs.h * | |
* * | |
* Description: Structs for IIR/FIR resamplers * | |
* * | |
* Copyright 2010 (c), Skype Limited * | |
* All rights reserved. * | |
* * | |
* */ | |
#ifndef SKP_Silk_RESAMPLER_H | |
#define SKP_Silk_RESAMPLER_H | |
#ifdef __cplusplus | |
extern "C" { | |
#endif | |
#include "SKP_Silk_SigProc_FIX.h" | |
#include "SKP_Silk_resampler_structs.h" | |
#include "SKP_Silk_resampler_rom.h" | |
/* Number of input samples to process in the inner loop */ | |
#define RESAMPLER_MAX_BATCH_SIZE_IN 480 | |
/* Description: Hybrid IIR/FIR polyphase implementation of resampling */ | |
void SKP_Silk_resampler_private_IIR_FIR( | |
void *SS, /* I/O: Resampler state */ | |
SKP_int16 out[], /* O: Output signal */ | |
const SKP_int16 in[], /* I: Input signal */ | |
SKP_int32 inLen /* I: Number of input samples */ | |
); | |
/* Description: Hybrid IIR/FIR polyphase implementation of resampling */ | |
void SKP_Silk_resampler_private_down_FIR( | |
void *SS, /* I/O: Resampler state */ | |
SKP_int16 out[], /* O: Output signal */ | |
const SKP_int16 in[], /* I: Input signal */ | |
SKP_int32 inLen /* I: Number of input samples */ | |
); | |
/* Copy */ | |
void SKP_Silk_resampler_private_copy( | |
void *SS, /* I/O: Resampler state (unused) */ | |
SKP_int16 out[], /* O: Output signal */ | |
const SKP_int16 in[], /* I: Input signal */ | |
SKP_int32 inLen /* I: Number of input samples */ | |
); | |
/* Upsample by a factor 2, high quality */ | |
void SKP_Silk_resampler_private_up2_HQ_wrapper( | |
void *SS, /* I/O: Resampler state (unused) */ | |
SKP_int16 *out, /* O: Output signal [ 2 * len ] */ | |
const SKP_int16 *in, /* I: Input signal [ len ] */ | |
SKP_int32 len /* I: Number of input samples */ | |
); | |
/* Upsample by a factor 2, high quality */ | |
void SKP_Silk_resampler_private_up2_HQ( | |
SKP_int32 *S, /* I/O: Resampler state [ 6 ] */ | |
SKP_int16 *out, /* O: Output signal [ 2 * len ] */ | |
const SKP_int16 *in, /* I: Input signal [ len ] */ | |
SKP_int32 len /* I: Number of input samples */ | |
); | |
/* Upsample 4x, low quality */ | |
void SKP_Silk_resampler_private_up4( | |
SKP_int32 *S, /* I/O: State vector [ 2 ] */ | |
SKP_int16 *out, /* O: Output signal [ 4 * len ] */ | |
const SKP_int16 *in, /* I: Input signal [ len ] */ | |
SKP_int32 len /* I: Number of input samples */ | |
); | |
/* Downsample 4x, low quality */ | |
void SKP_Silk_resampler_private_down4( | |
SKP_int32 *S, /* I/O: State vector [ 2 ] */ | |
SKP_int16 *out, /* O: Output signal [ floor(len/2) ] */ | |
const SKP_int16 *in, /* I: Input signal [ len ] */ | |
SKP_int32 inLen /* I: Number of input samples */ | |
); | |
/* Second order AR filter */ | |
void SKP_Silk_resampler_private_AR2( | |
SKP_int32 S[], /* I/O: State vector [ 2 ] */ | |
SKP_int32 out_Q8[], /* O: Output signal */ | |
const SKP_int16 in[], /* I: Input signal */ | |
const SKP_int16 A_Q14[], /* I: AR coefficients, Q14 */ | |
SKP_int32 len /* I: Signal length */ | |
); | |
/* Fourth order ARMA filter */ | |
void SKP_Silk_resampler_private_ARMA4( | |
SKP_int32 S[], /* I/O: State vector [ 4 ] */ | |
SKP_int16 out[], /* O: Output signal */ | |
const SKP_int16 in[], /* I: Input signal */ | |
const SKP_int16 Coef[], /* I: ARMA coefficients [ 7 ] */ | |
SKP_int32 len /* I: Signal length */ | |
); | |
#ifdef __cplusplus | |
} | |
#endif | |
#endif // SKP_Silk_RESAMPLER_H | |