| /* |
| * 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. |
| * |
| * Some code in this file was originally from file omxSP_FFTGetBufSize_R_S32.c |
| * which was licensed as follows. |
| * It has been relicensed with permission from the copyright holders. |
| */ |
| |
| /* |
| * OpenMAX DL: v1.0.2 |
| * Last Modified Revision: |
| * Last Modified Date: |
| */ |
| |
| #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_R_S16 |
| * |
| * 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 16-bit functions |
| * <FFTFwd_RToCCS_S16_Sfs> and <FFTInv_CCSToR_S16_Sfs>. |
| * |
| * Parameters: |
| * [in] order base-2 logarithm of the length; valid in the range |
| * [1,12]. |
| * [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_S16(OMX_INT order, OMX_INT *pSize) { |
| OMX_INT NBy2,N,twiddleSize; |
| |
| /* Order zero not allowed */ |
| if (order == 0) { |
| return OMX_Sts_BadArgErr; |
| } |
| |
| 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_SC16) |
| /* Twiddle factors */ |
| + sizeof(OMX_SC16) * twiddleSize |
| /* Ping Pong buffer for doing the N/2 point complex FFT; */ |
| /* extra size 'N' as a temporary buf for FFTInv_CCSToR_S16_Sfs */ |
| + sizeof(OMX_S16) * (N << 1) |
| /* Extra bytes to get 32 byte alignment of ptwiddle and pBuf */ |
| + 62 ; |
| |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| /***************************************************************************** |
| * END OF FILE |
| *****************************************************************************/ |
| |