| /* |
| * 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_SC32.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/arm/armOMX.h" |
| #include "dl/api/omxtypes.h" |
| #include "dl/sp/api/armSP.h" |
| #include "dl/sp/api/omxSP.h" |
| |
| |
| /** |
| * Function: omxSP_FFTGetBufSize_C_SC32 (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_SC32> is used in conjunction with the 32-bit functions |
| * <FFTFwd_CToC_SC32_Sfs> and <FFTInv_CToC_SC32_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_SC32( |
| OMX_INT order, |
| OMX_INT *pSize) |
| { |
| |
| OMX_INT N,twiddleSize; |
| |
| /* Check for order zero */ |
| if (order == 0) |
| { |
| *pSize = sizeof(ARMsFFTSpec_SC32); |
| 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; |
| |
| *pSize = sizeof(ARMsFFTSpec_SC32) |
| /* N Twiddle factors */ |
| + sizeof(OMX_SC32) * twiddleSize |
| /* Ping Pong buffer */ |
| + sizeof(OMX_SC32) * N |
| + 62 ; /* Extra bytes to get 32 byte alignment of ptwiddle and pBuf */ |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| /***************************************************************************** |
| * END OF FILE |
| *****************************************************************************/ |
| |