1 /*

     2  * LIBOIL - Library of Optimized Inner Loops

     3  * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>

     4  * All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions

     8  * are met:

     9  * 1. Redistributions of source code must retain the above copyright

    10  *    notice, this list of conditions and the following disclaimer.

    11  * 2. Redistributions in binary form must reproduce the above copyright

    12  *    notice, this list of conditions and the following disclaimer in the

    13  *    documentation and/or other materials provided with the distribution.

    14  * 

    15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

    16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,

    19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

    21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

    23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

    24  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    25  * POSSIBILITY OF SUCH DAMAGE.

    26  */

    27 //Portions Copyright (c)  2008-2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 

    28 

    29 #ifdef HAVE_CONFIG_H

    30 #include "config.h"

    31 #endif

    32 

    33 #include <liboil/liboilfunction.h>

    34 #include "liboil/dct/dct.h"

    35 #include <math.h>

    36 

    37 

    38 /**

    39  * oil_imdct32_f32:

    40  * @d_32:

    41  * @s_32:

    42  *

    43  * Performs a Inverse Modified Discrete Cosine Transform (IMDCT)

    44  * on the source array @s_32 and places the result in @d_32.

    45  */

    46 OIL_DEFINE_CLASS (imdct32_f32, "float *d_32, float *s_32");

    47 

    48 static void imdct32_f32_ref (float *dest, const float *src)

    49 {

    50 	double x;

    51 	int i,j;

    52 	double coeff;

    53 

    54 	for(i=0;i<32;i++){

    55 		x = 0;

    56 		for(j=0;j<32;j++){

    57 			coeff = cos((M_PI/32)*i*(j+0.5));

    58 			x += coeff * src[j];

    59 		}

    60 		dest[i] = x;

    61 	}

    62 }

    63 

    64 OIL_DEFINE_IMPL_REF (imdct32_f32_ref, imdct32_f32);

    65 

    66 

    67 

    68 #ifdef	__SYMBIAN32__

    69  

    70 OilFunctionClass* __oil_function_class_imdct32_f32() {

    71 		return &_oil_function_class_imdct32_f32;

    72 }

    73 #endif

    74 

    75 

    76 

    77 #ifdef	__SYMBIAN32__

    78  

    79 OilFunctionImpl* __oil_function_impl_imdct32_f32_ref() {

    80 		return &_oil_function_impl_imdct32_f32_ref;

    81 }

    82 #endif

    83 

    84 

    85 

    86 #ifdef	__SYMBIAN32__

    87  

    88 EXPORT_C void** _oil_function_class_ptr_imdct32_f32 ()	{

    89 	oil_function_class_ptr_imdct32_f32 = __oil_function_class_imdct32_f32();

    90 	return &oil_function_class_ptr_imdct32_f32->func;

    91 	}

    92 #endif

    93