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/*
* This file is part of AtracDEnc.
*
* AtracDEnc is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* AtracDEnc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with AtracDEnc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "at3p_mdct.h"
#include "util.h"
#include <array>
#include <iostream>
#include <vector>
using std::vector;
namespace NAtracDEnc {
static std::array<float, 128> SineWin;
static void InitSineWin() {
if (SineWin[SineWin.size() - 1] == 0.0) {
for (size_t i = 0; i < SineWin.size(); i++) {
SineWin[i] = 2.0 * sinf((i + 0.5) * (M_PI / (2.0 * SineWin.size())));
}
}
}
TAt3pMDCT::TAt3pMDCT()
{
InitSineWin();
}
void TAt3pMDCT::Do(float specs[2048], const TPcmBandsData& bands, THistBuf& work)
{
for (size_t b = 0; b < 16; b++) {
const float* srcBuff = bands[b];
float* const curSpec = &specs[b*128];
std::array<float, 256>& tmp = work[b];
for (size_t i = 0; i < 128; i++) {
tmp[128 + i] = SineWin[127 - i] * srcBuff[i];
}
const vector<float>& sp = Mdct(tmp.data());
memcpy(curSpec, sp.data(), 128 * sizeof(float));
if (b & 1) {
SwapArray(curSpec, 128);
}
for (size_t i = 0; i < 128; i++) {
tmp[i] = SineWin[i] * srcBuff[i];
}
}
}
TAt3pMIDCT::TAt3pMIDCT()
{
InitSineWin();
}
void TAt3pMIDCT::Do(float specs[2048], TPcmBandsData& bands, THistBuf& work)
{
for (size_t b = 0; b < 16; b++) {
float* dstBuff = bands[b];
float* const curSpec = &specs[b*128];
std::array<float, 128>& tmp = work[b];
if (b & 1) {
SwapArray(curSpec, 128);
}
vector<float> inv = Midct(curSpec);
for (int j = 0; j < 128; ++j) {
inv[j] *= SineWin[j];
inv[255 - j] *= SineWin[j];
}
for (uint32_t j = 0; j < 128; ++j) {
dstBuff[j] = inv[j] + tmp[j];
}
memcpy(tmp.data(), &inv[128], sizeof(float)*128);
}
}
};
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