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| 1 /* |
| 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 * |
| 10 * This file was originally licensed as follows. It has been |
| 11 * relicensed with permission from the copyright holders. |
| 12 */ |
| 13 |
| 14 /** |
| 15 * |
| 16 * File Name: omxSP_FFTGetBufSize_R_S16S32.c |
| 17 * OpenMAX DL: v1.0.2 |
| 18 * Last Modified Revision: 7777 |
| 19 * Last Modified Date: Thu, 27 Sep 2007 |
| 20 * |
| 21 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| 22 * |
| 23 * |
| 24 * Description: |
| 25 * Computes the size of the specification structure required. |
| 26 */ |
| 27 |
| 28 #include "dl/api/armOMX.h" |
| 29 #include "dl/api/omxtypes.h" |
| 30 #include "dl/sp/api/armSP.h" |
| 31 #include "dl/sp/api/omxSP.h" |
| 32 |
| 33 /** |
| 34 * Function: omxSP_FFTGetBufSize_R_S16S32 |
| 35 * |
| 36 * Description: |
| 37 * Computes the size of the specification structure required for the length |
| 38 * 2^order real FFT and IFFT functions. |
| 39 * |
| 40 * Remarks: |
| 41 * This function is used in conjunction with the 16-bit functions |
| 42 * <FFTFwd_RToCCS_S16_S32_Sfs> and <FFTInv_CCSToR_S32_S16_Sfs>. |
| 43 * |
| 44 * Parameters: |
| 45 * [in] order base-2 logarithm of the length; valid in the range |
| 46 * [0,12]. |
| 47 * [out] pSize pointer to the number of bytes required for the |
| 48 * specification structure. |
| 49 * |
| 50 * Return Value: |
| 51 * Standard omxError result. See enumeration for possible result codes. |
| 52 * |
| 53 */ |
| 54 |
| 55 OMXResult omxSP_FFTGetBufSize_R_S16S32( |
| 56 OMX_INT order, |
| 57 OMX_INT *pSize |
| 58 ) |
| 59 { |
| 60 OMX_INT NBy2,N,twiddleSize; |
| 61 |
| 62 |
| 63 /* Check for order zero */ |
| 64 if (order == 0) |
| 65 { |
| 66 *pSize = sizeof(ARMsFFTSpec_R_SC32) |
| 67 + sizeof(OMX_S32) * (2); /* Extra size 'N' is used in FFTInv_CC
SToR_S32S16_Sfs as a temporary buf */ |
| 68 |
| 69 return OMX_Sts_NoErr; |
| 70 } |
| 71 |
| 72 NBy2 = 1 << (order - 1); |
| 73 N = NBy2<<1; |
| 74 twiddleSize = 5*N/8; /* 3/4(N/2) + N/4 */ |
| 75 |
| 76 /* 2 pointers to store bitreversed array and twiddle factor array */ |
| 77 *pSize = sizeof(ARMsFFTSpec_R_SC32) |
| 78 /* Twiddle factors */ |
| 79 + sizeof(OMX_SC32) * twiddleSize |
| 80 /* Ping Pong buffer for doing the N/2 point complex FFT */ |
| 81 + sizeof(OMX_S32) * (N<<1) /* Extra size 'N' is used in FFTInv_CCSTo
R_S32S16_Sfs as a temporary buf */ |
| 82 + 62 ; /* Extra bytes to get 32 byte alignment of ptwiddle and pBuf
*/ |
| 83 |
| 84 |
| 85 return OMX_Sts_NoErr; |
| 86 } |
| 87 |
| 88 /***************************************************************************** |
| 89 * END OF FILE |
| 90 *****************************************************************************/ |
| 91 |
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