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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 "encode.h"
#include <iostream>
namespace NAtracDEnc {
using NBitStream::TBitStream;
class TBitStreamEncoder::TImpl : public TBitAllocHandler {
public:
explicit TImpl(std::vector<IBitStreamPartEncoder::TPtr>&& encoders);
void DoStart(size_t targetBits, float minLambda, float maxLambda) noexcept;
float DoContinue() noexcept;
void DoSubmit(size_t gotBits) noexcept;
bool DoCheck(size_t gotBits) const noexcept;
void DoRun(void* frameData, TBitStream& bs);
uint32_t DoGetCurGlobalConsumption() const noexcept;
private:
std::vector<IBitStreamPartEncoder::TPtr> Encoders;
size_t CurEncPos;
size_t RepeatEncPos;
size_t TargetBits;
float MinLambda;
float MaxLambda;
float CurLambda;
float LastLambda;
bool NeedRepeat = false;
};
TBitStreamEncoder::TImpl::TImpl(std::vector<IBitStreamPartEncoder::TPtr>&& encoders)
: Encoders(std::move(encoders))
, CurEncPos(0)
, RepeatEncPos(0)
{
}
void TBitStreamEncoder::TImpl::DoStart(size_t targetBits, float minLambda, float maxLambda) noexcept
{
TargetBits = targetBits;
MinLambda = minLambda;
MaxLambda = maxLambda;
}
float TBitStreamEncoder::TImpl::DoContinue() noexcept
{
if (MaxLambda <= MinLambda) {
return LastLambda;
}
CurLambda = (MaxLambda + MinLambda) / 2.0;
RepeatEncPos = CurEncPos;
return CurLambda;
}
void TBitStreamEncoder::TImpl::DoSubmit(size_t gotBits) noexcept
{
if (MaxLambda <= MinLambda) {
NeedRepeat = false;
} else {
if (gotBits < TargetBits) {
LastLambda = CurLambda;
MaxLambda = CurLambda - 0.01f;
NeedRepeat = true;
} else if (gotBits > TargetBits) {
MinLambda = CurLambda + 0.01f;
NeedRepeat = true;
} else {
NeedRepeat = false;
}
}
}
bool TBitStreamEncoder::TImpl::DoCheck(size_t gotBits) const noexcept
{
return gotBits < TargetBits;
}
void TBitStreamEncoder::TImpl::DoRun(void* frameData, TBitStream& bs)
{
bool cont = false;
do {
for (CurEncPos = RepeatEncPos; CurEncPos < Encoders.size(); CurEncPos++) {
auto status = Encoders[CurEncPos]->Encode(frameData, *this);
if (NeedRepeat) {
NeedRepeat = false;
cont = true;
break;
} else {
cont = false;
}
if (status == IBitStreamPartEncoder::EStatus::Repeat) {
cont = true;
for (size_t i = 0; i < CurEncPos; i++) {
Encoders[i]->Reset();
}
RepeatEncPos = 0;
break;
}
}
} while (cont);
for (size_t i = 0; i < Encoders.size(); i++) {
Encoders[i]->Dump(bs);
}
}
uint32_t TBitStreamEncoder::TImpl::DoGetCurGlobalConsumption() const noexcept
{
uint32_t consumption = 0;
for (size_t i = 0; i < CurEncPos; i++) {
consumption += Encoders[i]->GetConsumption();
}
return consumption;
}
/////
TBitStreamEncoder::TBitStreamEncoder(std::vector<IBitStreamPartEncoder::TPtr>&& encoders)
: Impl(new TBitStreamEncoder::TImpl(std::move(encoders)))
{}
TBitStreamEncoder::~TBitStreamEncoder()
{
delete Impl;
}
void TBitStreamEncoder::Do(void* frameData, TBitStream& bs)
{
Impl->DoRun(frameData, bs);
}
/////
void TBitAllocHandler::Start(size_t targetBits, float minLambda, float maxLambda) noexcept
{
TBitStreamEncoder::TImpl* self = static_cast<TBitStreamEncoder::TImpl*>(this);
self->DoStart(targetBits, minLambda, maxLambda);
}
float TBitAllocHandler::Continue() noexcept
{
TBitStreamEncoder::TImpl* self = static_cast<TBitStreamEncoder::TImpl*>(this);
return self->DoContinue();
}
void TBitAllocHandler::Submit(size_t gotBits) noexcept
{
TBitStreamEncoder::TImpl* self = static_cast<TBitStreamEncoder::TImpl*>(this);
self->DoSubmit(gotBits);
}
bool TBitAllocHandler::Check(size_t gotBits) const noexcept
{
const TBitStreamEncoder::TImpl* self = static_cast<const TBitStreamEncoder::TImpl*>(this);
return self->DoCheck(gotBits);
}
uint32_t TBitAllocHandler::GetCurGlobalConsumption() const noexcept
{
const TBitStreamEncoder::TImpl* self = static_cast<const TBitStreamEncoder::TImpl*>(this);
return self->DoGetCurGlobalConsumption();
}
}
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