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/*
* Copyright (c) 2015 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 "webrtc/common_audio/real_fourier_openmax.h"
#include <cstdlib>
#include "dl/sp/api/omxSP.h"
#include "webrtc/base/checks.h"
namespace webrtc {
using std::complex;
namespace {
// Creates and initializes the Openmax state. Transfers ownership to caller.
OMXFFTSpec_R_F32* CreateOpenmaxState(int order) {
RTC_CHECK_GE(order, 1);
// The omx implementation uses this macro to check order validity.
RTC_CHECK_LE(order, TWIDDLE_TABLE_ORDER);
OMX_INT buffer_size;
OMXResult r = omxSP_FFTGetBufSize_R_F32(order, &buffer_size);
RTC_CHECK_EQ(r, OMX_Sts_NoErr);
OMXFFTSpec_R_F32* omx_spec = malloc(buffer_size);
RTC_DCHECK(omx_spec);
r = omxSP_FFTInit_R_F32(omx_spec, order);
RTC_CHECK_EQ(r, OMX_Sts_NoErr);
return omx_spec;
}
} // namespace
RealFourierOpenmax::RealFourierOpenmax(int fft_order)
: order_(fft_order),
omx_spec_(CreateOpenmaxState(order_)) {
}
RealFourierOpenmax::~RealFourierOpenmax() {
free(omx_spec_);
}
void RealFourierOpenmax::Forward(const float* src, complex<float>* dest) const {
// This cast is well-defined since C++11. See "Non-static data members" at:
// http://en.cppreference.com/w/cpp/numeric/complex
OMXResult r =
omxSP_FFTFwd_RToCCS_F32(src, reinterpret_cast<OMX_F32*>(dest), omx_spec_);
RTC_CHECK_EQ(r, OMX_Sts_NoErr);
}
void RealFourierOpenmax::Inverse(const complex<float>* src, float* dest) const {
OMXResult r =
omxSP_FFTInv_CCSToR_F32(reinterpret_cast<const OMX_F32*>(src), dest,
omx_spec_);
RTC_CHECK_EQ(r, OMX_Sts_NoErr);
}
} // namespace webrtc
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