| /* |
| * 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" |
| |
| void x86SP_FFT_CToC_FC32_Inv_Radix2_fs( |
| const OMX_F32 *in, |
| OMX_F32 *out, |
| OMX_INT n) { |
| OMX_INT i; |
| OMX_INT n_by_2 = n >> 1; |
| OMX_F32 *out0 = out; |
| |
| for (i = 0; i < n_by_2; i++) { |
| const OMX_F32 *in0 = in + i; |
| const OMX_F32 *in1 = in0 + n_by_2; |
| OMX_F32 *out1 = out0 + n_by_2; |
| |
| // CADD out0, in0, in1 |
| out0[0] = in0[0] + in1[0]; |
| out0[n] = in0[n] + in1[n]; |
| |
| // CSUB out1, in0, in1 |
| out1[0] = in0[0] - in1[0]; |
| out1[n] = in0[n] - in1[n]; |
| |
| out0 += 1; |
| } |
| } |