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Diffstat (limited to 'media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_C_SC16.c')
-rw-r--r-- | media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_C_SC16.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_C_SC16.c b/media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_C_SC16.c new file mode 100644 index 000000000..288c76ca6 --- /dev/null +++ b/media/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_C_SC16.c @@ -0,0 +1,96 @@ +/* + * 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 + *****************************************************************************/ + |