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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 <atrac3p.h>
#include <atrac/atrac3plus_pqf/atrac3plus_pqf.h>
#include "at3p_bitstream.h"
#include "at3p_gha.h"
#include <cassert>
#include <vector>
using std::vector;
namespace NAtracDEnc {
class TAt3PEnc::TImpl {
public:
TImpl(ICompressedOutput* out, int channels)
: BitStream(out, 2048)
, ChannelCtx(channels)
, GhaProcessor(MakeGhaProcessor0(channels == 2))
{}
TPCMEngine::EProcessResult EncodeFrame(const float* data, int channels);
private:
struct TChannelCtx {
TChannelCtx()
: PqfCtx(at3plus_pqf_create_a_ctx())
{}
~TChannelCtx() {
at3plus_pqf_free_a_ctx(PqfCtx);
}
at3plus_pqf_a_ctx_t PqfCtx;
float* NextBuf = Buf1;
float* CurBuf = nullptr;
float Buf1[TAt3PEnc::NumSamples];
float Buf2[TAt3PEnc::NumSamples];
};
TAt3PBitStream BitStream;
vector<TChannelCtx> ChannelCtx;
std::unique_ptr<IGhaProcessor> GhaProcessor;
};
TPCMEngine::EProcessResult TAt3PEnc::TImpl::
EncodeFrame(const float* data, int channels)
{
int needMore = 0;
for (int ch = 0; ch < channels; ch++) {
float src[TAt3PEnc::NumSamples];
for (size_t i = 0; i < NumSamples; ++i) {
src[i] = data[i * channels + ch];
}
at3plus_pqf_do_analyse(ChannelCtx[ch].PqfCtx, src, ChannelCtx[ch].NextBuf);
if (ChannelCtx[ch].CurBuf == nullptr) {
assert(ChannelCtx[ch].NextBuf == ChannelCtx[ch].Buf1);
ChannelCtx[ch].CurBuf = ChannelCtx[ch].Buf2;
std::swap(ChannelCtx[ch].NextBuf, ChannelCtx[ch].CurBuf);
needMore++;
}
}
if (needMore == channels) {
return TPCMEngine::EProcessResult::LOOK_AHEAD;
}
assert(needMore == 0);
const float* b1Cur = ChannelCtx[0].CurBuf;
const float* b1Next = ChannelCtx[0].NextBuf;
const float* b2Cur = (channels == 2) ? ChannelCtx[1].CurBuf : nullptr;
const float* b2Next = (channels == 2) ? ChannelCtx[1].NextBuf : nullptr;
auto tonalBlock = GhaProcessor->DoAnalize({b1Cur, b1Next}, {b2Cur, b2Next});
BitStream.WriteFrame(channels, tonalBlock);
for (int ch = 0; ch < channels; ch++) {
std::swap(ChannelCtx[ch].NextBuf, ChannelCtx[ch].CurBuf);
}
return TPCMEngine::EProcessResult::PROCESSED;
}
TAt3PEnc::TAt3PEnc(TCompressedOutputPtr&& out, int channels)
: Out(std::move(out))
, Channels(channels)
{
}
TPCMEngine::TProcessLambda TAt3PEnc::GetLambda() {
Impl.reset(new TImpl(Out.get(), Channels));
return [this](float* data, const TPCMEngine::ProcessMeta&) {
return Impl->EncodeFrame(data, Channels);
};
}
}
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