| /* |
| * Copyright (c) 2014 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 <stdint.h> |
| |
| #include "dl/api/omxtypes.h" |
| #include "dl/sp/api/omxSP.h" |
| #include "dl/sp/api/mipsSP.h" |
| |
| extern OMXResult mips_FFTInv_CCSToR_F32_complex( |
| const OMX_F32* pSrc, |
| OMX_F32* pDst, |
| const MIPSFFTSpec_R_FC32* pFFTSpec); |
| |
| extern OMXResult mips_FFTInv_CCSToR_F32_real( |
| const OMX_F32* pSrc, |
| OMX_F32* pDst, |
| const MIPSFFTSpec_R_FC32* pFFTSpec); |
| |
| OMXResult omxSP_FFTInv_CCSToR_F32_Sfs(const OMX_F32* pSrc, |
| OMX_F32* pDst, |
| const OMXFFTSpec_R_F32* pFFTSpec) { |
| const MIPSFFTSpec_R_FC32* pFFTStruct = (const MIPSFFTSpec_R_FC32*)pFFTSpec; |
| |
| /* Input buffers must be 32 bytes aligned. */ |
| if (!pSrc || !pDst || (uintptr_t)pSrc & 31 || (uintptr_t)pDst & 31 || |
| !pFFTSpec) |
| return OMX_Sts_BadArgErr; |
| |
| /* Check if the structure is initialized correctly. */ |
| if (!pFFTStruct->pBitRev || !pFFTStruct->pBitRevInv || !pFFTStruct->pOffset || |
| !pFFTStruct->pTwiddle || !pFFTStruct->pBuf || (pFFTStruct->order < 1) || |
| (pFFTStruct->order > TWIDDLE_TABLE_ORDER)) |
| return OMX_Sts_BadArgErr; |
| |
| /* |
| * For order larger than 4, compute Real IFFT as |
| * Complex IFFT of (order - 1). |
| */ |
| if (pFFTStruct->order > 4) |
| return mips_FFTInv_CCSToR_F32_complex(pSrc, pDst, pFFTStruct); |
| |
| /* Special case for order == 1. */ |
| if (pFFTStruct->order == 1) { |
| pDst[0] = (pSrc[0] + pSrc[2]) / 2; |
| pDst[1] = (pSrc[0] - pSrc[2]) / 2; |
| return OMX_Sts_NoErr; |
| } |
| |
| /* Other short IFFTs. */ |
| return mips_FFTInv_CCSToR_F32_real(pSrc, pDst, pFFTStruct); |
| } |