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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*
* This file was originally licensed as follows. It has been
* relicensed with permission from the copyright holders.
*/
/**
*
* File Name: omxSP_FFTGetBufSize_R_S32.c
* OpenMAX DL: v1.0.2
* Last Modified Revision: 7777
* Last Modified Date: Thu, 27 Sep 2007
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
* Description:
* Computes the size of the specification structure required.
*/
#include "dl/api/armOMX.h"
#include "dl/api/omxtypes.h"
#include "dl/sp/api/armSP.h"
#include "dl/sp/api/omxSP.h"
/**
* Function: omxSP_FFTGetBufSize_R_S32
*
* Description:
* Computes the size of the specification structure required for the length
* 2^order real FFT and IFFT functions.
*
* Remarks:
* This function is used in conjunction with the 32-bit functions
* <FFTFwd_RToCCS_S32_Sfs> and <FFTInv_CCSToR_S32_Sfs>.
*
* Parameters:
* [in] order base-2 logarithm of the length; valid in the range
* [0,12].
* [out] pSize pointer to the number of bytes required for the
* specification structure.
*
* Return Value:
* Standard omxError result. See enumeration for possible result codes.
*
*/
OMXResult omxSP_FFTGetBufSize_R_S32(
OMX_INT order,
OMX_INT *pSize
)
{
OMX_INT NBy2,N,twiddleSize;
/* Check for order zero */
if (order == 0)
{
*pSize = sizeof(ARMsFFTSpec_R_SC32)
+ sizeof(OMX_S32) * (2); /* Extra size 'N' is used in FFTInv_CCSToR_S32S16_Sfs as a temporary buf */
return OMX_Sts_NoErr;
}
NBy2 = 1 << (order - 1);
N = NBy2<<1;
twiddleSize = 5*N/8; /* 3/4(N/2) + N/4 */
/* 2 pointers to store bitreversed array and twiddle factor array */
*pSize = sizeof(ARMsFFTSpec_R_SC32)
/* Twiddle factors */
+ sizeof(OMX_SC32) * twiddleSize
/* Ping Pong buffer for doing the N/2 point complex FFT */
+ sizeof(OMX_S32) * (N<<1) /* Extra size 'N' is used in FFTInv_CCSToR_S32_Sfs as a temporary buf */
+ 62 ; /* Extra bytes to get 32 byte alignment of ptwiddle and pBuf */
return OMX_Sts_NoErr;
}
/*****************************************************************************
* END OF FILE
*****************************************************************************/
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