sl@0: /*
sl@0:  * LIBOIL - Library of Optimized Inner Loops
sl@0:  * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
sl@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
sl@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
sl@0:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
sl@0:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
sl@0:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sl@0:  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
sl@0:  * POSSIBILITY OF SUCH DAMAGE.
sl@0:  */
sl@0: //Portions Copyright (c)  2008-2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 
sl@0: 
sl@0: #ifdef HAVE_CONFIG_H
sl@0: #include "config.h"
sl@0: #endif
sl@0: 
sl@0: #include <liboil/liboilfunction.h>
sl@0: #include <liboil/liboilfuncs.h>
sl@0: #include "liboil/dct/dct.h"
sl@0: 
sl@0: 
sl@0: 
sl@0: #define C0_9808 0.980785280
sl@0: #define C0_9239 0.923879532
sl@0: #define C0_8315 0.831469612
sl@0: #define C0_7071 0.707106781
sl@0: #define C0_5556 0.555570233
sl@0: #define C0_3827 0.382683432
sl@0: #define C0_1951 0.195090322
sl@0: 
sl@0: /**
sl@0:  * oil_fdct8x8s_s16:
sl@0:  * @d_8x8:
sl@0:  * @ds:
sl@0:  * @s_8x8:
sl@0:  * @ss:
sl@0:  *
sl@0:  * Performs a 2-D Forward Discrete Cosine Transform on @s_8x8 and places
sl@0:  * the result in @d_8x8.
sl@0:  *
sl@0:  * This function uses an alternate scaling used by RTjpeg.
sl@0:  */
sl@0: OIL_DEFINE_CLASS(fdct8x8s_s16,
sl@0:     "int16_t *d_8x8, int ds, int16_t *s_8x8, int ss");
sl@0: 
sl@0: #if defined(oil_fdct8x8_f64) && defined(oil_conv8x8_s16_f64)
sl@0: static void
sl@0: fdct8x8s_s16_ref (int16_t *dest, int dstr, const int16_t *src, int sstr)
sl@0: {
sl@0: 	double s[64], d[64];
sl@0: 	double scale[8] = {
sl@0: 		4*C0_7071,
sl@0: 		4*C0_9808,
sl@0: 		4*C0_9239,
sl@0: 		4*C0_8315,
sl@0: 		4*C0_7071,
sl@0: 		4*C0_5556,
sl@0: 		4*C0_3827,
sl@0: 		4*C0_1951,
sl@0: 	};
sl@0: 	int i,j;
sl@0: 
sl@0: 	for(i=0;i<8;i++){
sl@0: 		for(j=0;j<8;j++){
sl@0: 			s[8*i+j] = OIL_GET (src,sstr*i+j*sizeof(int16_t), int16_t);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 	oil_fdct8x8_f64(d,8*sizeof(double),s,8*sizeof(double));
sl@0: 
sl@0: 	for(i=0;i<8;i++){
sl@0: 		for(j=0;j<8;j++){
sl@0: 			d[8*i+j] *= scale[i] * scale[j];
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 	oil_conv8x8_s16_f64(dest,dstr,d,8*sizeof(double));
sl@0: }
sl@0: 
sl@0: OIL_DEFINE_IMPL_REF (fdct8x8s_s16_ref, fdct8x8s_s16);
sl@0: #endif
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: OilFunctionClass* __oil_function_class_fdct8x8s_s16() {
sl@0: 		return &_oil_function_class_fdct8x8s_s16;
sl@0: }
sl@0: #endif
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: OilFunctionImpl* __oil_function_impl_fdct8x8s_s16_ref() {
sl@0: 		return &_oil_function_impl_fdct8x8s_s16_ref;
sl@0: }
sl@0: #endif
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: EXPORT_C void** _oil_function_class_ptr_fdct8x8s_s16 ()	{
sl@0: 	oil_function_class_ptr_fdct8x8s_s16 = __oil_function_class_fdct8x8s_s16();
sl@0: 	return &oil_function_class_ptr_fdct8x8s_s16->func;
sl@0: 	}
sl@0: #endif
sl@0: