1 /* 2 * Copyright (c) 2015 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 11 #include "webrtc/common_audio/real_fourier_openmax.h" 12 13 #include <cstdlib> 14 15 #include "dl/sp/api/omxSP.h" 16 #include "webrtc/base/checks.h" 17 18 namespace webrtc { 19 20 using std::complex; 21 22 namespace { 23 24 // Creates and initializes the Openmax state. Transfers ownership to caller. 25 OMXFFTSpec_R_F32* CreateOpenmaxState(int order) { 26 RTC_CHECK_GE(order, 1); 27 // The omx implementation uses this macro to check order validity. 28 RTC_CHECK_LE(order, TWIDDLE_TABLE_ORDER); 29 30 OMX_INT buffer_size; 31 OMXResult r = omxSP_FFTGetBufSize_R_F32(order, &buffer_size); 32 RTC_CHECK_EQ(r, OMX_Sts_NoErr); 33 34 OMXFFTSpec_R_F32* omx_spec = malloc(buffer_size); 35 RTC_DCHECK(omx_spec); 36 37 r = omxSP_FFTInit_R_F32(omx_spec, order); 38 RTC_CHECK_EQ(r, OMX_Sts_NoErr); 39 return omx_spec; 40 } 41 42 } // namespace 43 44 RealFourierOpenmax::RealFourierOpenmax(int fft_order) 45 : order_(fft_order), 46 omx_spec_(CreateOpenmaxState(order_)) { 47 } 48 49 RealFourierOpenmax::~RealFourierOpenmax() { 50 free(omx_spec_); 51 } 52 53 void RealFourierOpenmax::Forward(const float* src, complex<float>* dest) const { 54 // This cast is well-defined since C++11. See "Non-static data members" at: 55 // http://en.cppreference.com/w/cpp/numeric/complex 56 OMXResult r = 57 omxSP_FFTFwd_RToCCS_F32(src, reinterpret_cast<OMX_F32*>(dest), omx_spec_); 58 RTC_CHECK_EQ(r, OMX_Sts_NoErr); 59 } 60 61 void RealFourierOpenmax::Inverse(const complex<float>* src, float* dest) const { 62 OMXResult r = 63 omxSP_FFTInv_CCSToR_F32(reinterpret_cast<const OMX_F32*>(src), dest, 64 omx_spec_); 65 RTC_CHECK_EQ(r, OMX_Sts_NoErr); 66 } 67 68 } // namespace webrtc 69 70
