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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_C_SC16.c
* OpenMAX DL: v1.0.2
* Last Modified Revision: 9468
* Last Modified Date: Thu, 03 Jan 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
* Description:
* Compute 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_C_SC16 (2.2.4.1.6)
*
* Description:
* These functions compute the size of the specification structure
* required for the length 2^order complex FFT and IFFT functions. The function
* <FFTGetBufSize_C_SC16> is used in conjunction with the 16-bit functions
* <FFTFwd_CToC_SC16_Sfs> and <FFTInv_CToC_SC16_Sfs>.
*
* Input Arguments:
*
* order - base-2 logarithm of the desired block length; valid in the range
* [0,12]
*
* Output Arguments:
*
* pSize - pointer to the number of bytes required for the specification
* structure
*
* Return Value:
*
* OMX_Sts_NoErr - no error
*
*
*/
OMXResult omxSP_FFTGetBufSize_C_SC16(
OMX_INT order,
OMX_INT *pSize)
{
OMX_INT N,twiddleSize;
/* Check for order zero */
if (order == 0)
{
*pSize = sizeof(ARMsFFTSpec_SC16);
return OMX_Sts_NoErr;
}
N = 1 << order;
/*The max size of the twiddle table needed is 3N/4 for a radix-4 stage*/
twiddleSize = 3*N/4;
/* 2 pointers to store bitreversed array and twiddle factor array */
*pSize = sizeof(ARMsFFTSpec_SC16)
/* Twiddle factors */
+ sizeof(OMX_SC16) * twiddleSize
/* Ping Pong buffer */
+ sizeof(OMX_SC16) * N
+ 62 ; /* Extra bytes to get 32 byte alignment of ptwiddle and pBuf */
return OMX_Sts_NoErr;
}
/*****************************************************************************
* END OF FILE
*****************************************************************************/
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