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Diffstat (limited to 'media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_R_S32.c')
-rw-r--r-- | media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_R_S32.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_R_S32.c b/media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_R_S32.c new file mode 100644 index 0000000000..d57294700e --- /dev/null +++ b/media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_R_S32.c @@ -0,0 +1,91 @@ +/* + * 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 + *****************************************************************************/ + |