/***********************************************************************
Copyright (c) 2006-2010, Skype Limited. All rights reserved. 
Redistribution and use in source and binary forms, with or without 
modification, (subject to the limitations in the disclaimer below) 
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright 
notice, this list of conditions and the following disclaimer in the 
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific 
contributors, may be used to endorse or promote products derived from 
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED 
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/

/*																		*
 * 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

