1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* 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 <vector>
#include "atrac1denc.h"
#include "bitstream/bitstream.h"
#include "atrac/atrac1.h"
#include "atrac/atrac1_dequantiser.h"
#include "atrac/atrac1_qmf.h"
#include "atrac/atrac1_bitalloc.h"
#include "util.h"
namespace NAtracDEnc {
using namespace NBitStream;
using namespace NAtrac1;
using namespace NMDCT;
using std::vector;
TAtrac1Encoder::TAtrac1Encoder(TCompressedOutputPtr&& aea, TAtrac1EncodeSettings&& settings)
: Aea(std::move(aea))
, Settings(std::move(settings))
{
}
TAtrac1Decoder::TAtrac1Decoder(TCompressedInputPtr&& aea)
: Aea(std::move(aea))
{
}
static void vector_fmul_window(TFloat *dst, const TFloat *src0,
const TFloat *src1, const TFloat *win, int len)
{
int i, j;
dst += len;
win += len;
src0 += len;
for (i = -len, j = len - 1; i < 0; i++, j--) {
TFloat s0 = src0[i];
TFloat s1 = src1[j];
TFloat wi = win[i];
TFloat wj = win[j];
dst[i] = s0 * wj - s1 * wi;
dst[j] = s0 * wi + s1 * wj;
}
}
void TAtrac1MDCT::Mdct(TFloat Specs[512], TFloat* low, TFloat* mid, TFloat* hi, const TBlockSize& blockSize) {
uint32_t pos = 0;
for (uint32_t band = 0; band < NumQMF; band++) {
const uint32_t numMdctBlocks = 1 << blockSize.LogCount[band];
TFloat* srcBuf = (band == 0) ? low : (band == 1) ? mid : hi;
uint32_t bufSz = (band == 2) ? 256 : 128;
const uint32_t blockSz = (numMdctBlocks == 1) ? bufSz : 32;
uint32_t winStart = (numMdctBlocks == 1) ? ((band == 2) ? 112 : 48) : 0;
//compensate level for 3rd band in case of short window
const TFloat multiple = (numMdctBlocks != 1 && band == 2) ? 2.0 : 1.0;
vector<TFloat> tmp(512);
uint32_t blockPos = 0;
for (size_t k = 0; k < numMdctBlocks; ++k) {
memcpy(&tmp[winStart], &srcBuf[bufSz], 32 * sizeof(TFloat));
for (size_t i = 0; i < 32; i++) {
srcBuf[bufSz + i] = TAtrac1Data::SineWindow[i] * srcBuf[blockPos + blockSz - 32 + i];
srcBuf[blockPos + blockSz - 32 + i] = TAtrac1Data::SineWindow[31 - i] * srcBuf[blockPos + blockSz - 32 + i];
}
memcpy(&tmp[winStart+32], &srcBuf[blockPos], blockSz * sizeof(TFloat));
const vector<TFloat>& sp = (numMdctBlocks == 1) ? ((band == 2) ? Mdct512(&tmp[0]) : Mdct256(&tmp[0])) : Mdct64(&tmp[0]);
for (size_t i = 0; i < sp.size(); i++) {
Specs[blockPos + pos + i] = sp[i] * multiple;
}
if (band) {
SwapArray(&Specs[blockPos + pos], sp.size());
}
blockPos += 32;
}
pos += bufSz;
}
}
void TAtrac1MDCT::IMdct(TFloat Specs[512], const TBlockSize& mode, TFloat* low, TFloat* mid, TFloat* hi) {
uint32_t pos = 0;
for (size_t band = 0; band < NumQMF; band++) {
const uint32_t numMdctBlocks = 1 << mode.LogCount[band];
const uint32_t bufSz = (band == 2) ? 256 : 128;
const uint32_t blockSz = (numMdctBlocks == 1) ? bufSz : 32;
uint32_t start = 0;
TFloat* dstBuf = (band == 0) ? low : (band == 1) ? mid : hi;
vector<TFloat> invBuf(512);
TFloat* prevBuf = &dstBuf[bufSz * 2 - 16];
for (uint32_t block = 0; block < numMdctBlocks; block++) {
if (band) {
SwapArray(&Specs[pos], blockSz);
}
vector<TFloat> inv = (numMdctBlocks != 1) ? Midct64(&Specs[pos]) : (bufSz == 128) ? Midct256(&Specs[pos]) : Midct512(&Specs[pos]);
for (size_t i = 0; i < (inv.size()/2); i++) {
invBuf[start+i] = inv[i + inv.size()/4];
}
vector_fmul_window(dstBuf + start, prevBuf, &invBuf[start], &TAtrac1Data::SineWindow[0], 16);
prevBuf = &invBuf[start+16];
start += blockSz;
pos += blockSz;
}
if (numMdctBlocks == 1)
memcpy(dstBuf + 32, &invBuf[16], ((band == 2) ? 240 : 112) * sizeof(TFloat));
for (size_t j = 0; j < 16; j++) {
dstBuf[bufSz*2 - 16 + j] = invBuf[bufSz - 16 + j];
}
}
}
TPCMEngine<TFloat>::TProcessLambda TAtrac1Decoder::GetLambda() {
return [this](TFloat* data, const TPCMEngine<TFloat>::ProcessMeta& /*meta*/) {
TFloat sum[512];
const uint32_t srcChannels = Aea->GetChannelNum();
for (uint32_t channel = 0; channel < srcChannels; channel++) {
std::unique_ptr<ICompressedIO::TFrame> frame(Aea->ReadFrame());
TBitStream bitstream(frame->Get(), frame->Size());
TBlockSize mode(&bitstream);
TAtrac1Dequantiser dequantiser;
vector<TFloat> specs;
specs.resize(512);;
dequantiser.Dequant(&bitstream, mode, &specs[0]);
IMdct(&specs[0], mode, &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0]);
SynthesisFilterBank[channel].Synthesis(&sum[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0]);
for (size_t i = 0; i < NumSamples; ++i) {
if (sum[i] > PcmValueMax)
sum[i] = PcmValueMax;
if (sum[i] < PcmValueMin)
sum[i] = PcmValueMin;
data[i * srcChannels + channel] = sum[i];
}
}
};
}
TPCMEngine<TFloat>::TProcessLambda TAtrac1Encoder::GetLambda() {
const uint32_t srcChannels = Aea->GetChannelNum();
vector<IAtrac1BitAlloc*> bitAlloc;
for (size_t i = 0; i < srcChannels; i++) {
bitAlloc.push_back(new TAtrac1SimpleBitAlloc(Aea.get(), Settings.GetBfuIdxConst(), Settings.GetFastBfuNumSearch()));
}
return [this, srcChannels, bitAlloc](TFloat* data, const TPCMEngine<TFloat>::ProcessMeta& /*meta*/) {
for (uint32_t channel = 0; channel < srcChannels; channel++) {
TFloat src[NumSamples];
vector<TFloat> specs(512);
for (size_t i = 0; i < NumSamples; ++i) {
src[i] = data[i * srcChannels + channel];
}
SplitFilterBank[channel].Split(&src[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0]);
uint32_t windowMask = 0;
if (Settings.GetWindowMode() == TAtrac1EncodeSettings::EWindowMode::EWM_AUTO) {
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 0).Detect(&PcmBufLow[channel][0]);
const vector<TFloat>& invMid = InvertSpectr<128>(&PcmBufMid[channel][0]);
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 1).Detect(&invMid[0]) << 1;
const vector<TFloat>& invHi = InvertSpectr<256>(&PcmBufHi[channel][0]);
windowMask |= (uint32_t)TransientDetectors.GetDetector(channel, 2).Detect(&invHi[0]) << 2;
//std::cout << "trans: " << windowMask << std::endl;
} else {
//no transient detection, use given mask
windowMask = Settings.GetWindowMask();
}
const TBlockSize blockSize(windowMask & 0x1, windowMask & 0x2, windowMask & 0x4); //low, mid, hi
Mdct(&specs[0], &PcmBufLow[channel][0], &PcmBufMid[channel][0], &PcmBufHi[channel][0], blockSize);
bitAlloc[channel]->Write(Scaler.ScaleFrame(specs, blockSize), blockSize);
}
};
}
} //namespace NAtracDEnc
|
