| /* |
| * 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. |
| * |
| */ |
| |
| #include "dl/api/omxtypes.h" |
| #include "dl/sp/api/x86SP.h" |
| #include "dl/sp/api/omxSP.h" |
| |
| /** |
| * Function: omxSP_FFTGetBufSize_R_F32 |
| * |
| * 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_F32_Sfs> and <FFTInv_CCSToR_F32_Sfs>. |
| * |
| * Parameters: |
| * [in] order base-2 logarithm of the length; valid in the range |
| * [1,12]. ([1,15] if BIG_FFT_TABLE is defined.) |
| * [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_F32(OMX_INT order, OMX_INT *pSize) { |
| OMX_INT n_by_2; |
| OMX_INT n; |
| |
| if (!pSize || (order < 1) || (order > TWIDDLE_TABLE_ORDER)) |
| return OMX_Sts_BadArgErr; |
| |
| n_by_2 = 1 << (order - 1); |
| n = n_by_2 << 1; |
| |
| *pSize = sizeof(X86FFTSpec_R_FC32) + |
| // Twiddle factors. |
| sizeof(OMX_F32) * (n << 1) + |
| // Ping Pong buffer for doing the n/2 point complex FFT. |
| // pBuf1 |
| sizeof(OMX_F32) * n + 4 + |
| // pBuf2 |
| sizeof(OMX_F32) * n + 4 + |
| // Extra bytes to get 32 byte alignment of ptwiddle, pBuf1 |
| 62; |
| |
| return OMX_Sts_NoErr; |
| } |