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/*******************************************************************************
* Copyright 2015-2016 Juan Francisco Crespo Galán
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "fx/ConvolverReader.h"
#include "Exception.h"
#include <cstring>
#include <algorithm>
#include <cmath>
#include <cstdlib>
AUD_NAMESPACE_BEGIN
ConvolverReader::ConvolverReader(std::shared_ptr<IReader> reader, std::shared_ptr<ImpulseResponse> ir, std::shared_ptr<ThreadPool> threadPool, std::shared_ptr<FFTPlan> plan) :
m_reader(reader), m_ir(ir), m_N(plan->getSize()), m_eosReader(false), m_eosTail(false), m_inChannels(reader->getSpecs().channels), m_irChannels(ir->getSpecs().channels), m_threadPool(threadPool), m_position(0)
{
m_nChannelThreads = std::min((int)threadPool->getNumOfThreads(), m_inChannels);
m_futures.resize(m_nChannelThreads);
int irLength = m_ir->getLength();
if(m_irChannels != 1 && m_irChannels != m_inChannels)
AUD_THROW(StateException, "The impulse response and the sound must either have the same amount of channels or the impulse response must be mono");
if(m_reader->getSpecs().rate != m_ir->getSpecs().rate)
AUD_THROW(StateException, "The sound and the impulse response. must have the same rate");
m_M = m_L = m_N / 2;
if(m_irChannels > 1)
for(int i = 0; i < m_inChannels; i++)
m_convolvers.push_back(std::unique_ptr<Convolver>(new Convolver(ir->getChannel(i), irLength, m_threadPool, plan)));
else
for(int i = 0; i < m_inChannels; i++)
m_convolvers.push_back(std::unique_ptr<Convolver>(new Convolver(ir->getChannel(0), irLength, m_threadPool, plan)));
for(int i = 0; i < m_inChannels; i++)
m_vecInOut.push_back((sample_t*)std::malloc(m_L*sizeof(sample_t)));
m_outBuffer = (sample_t*)std::malloc(m_L*m_inChannels*sizeof(sample_t));
m_outBufLen = m_eOutBufLen = m_outBufferPos = m_L*m_inChannels;
}
ConvolverReader::~ConvolverReader()
{
std::free(m_outBuffer);
for(int i = 0; i < m_inChannels; i++)
std::free(m_vecInOut[i]);
}
bool ConvolverReader::isSeekable() const
{
return m_reader->isSeekable();
}
void ConvolverReader::seek(int position)
{
m_position = position;
m_reader->seek(position);
for(int i = 0; i < m_inChannels; i++)
m_convolvers[i]->reset();
m_eosTail = false;
m_eosReader = false;
m_outBufferPos = m_eOutBufLen = m_outBufLen;
}
int ConvolverReader::getLength() const
{
return m_reader->getLength();
}
int ConvolverReader::getPosition() const
{
return m_position;
}
Specs ConvolverReader::getSpecs() const
{
return m_reader->getSpecs();
}
void ConvolverReader::read(int& length, bool& eos, sample_t* buffer)
{
if(length <= 0)
{
length = 0;
eos = (m_eosTail && m_outBufferPos >= m_eOutBufLen);
return;
}
eos = false;
int writePos = 0;
do
{
int bufRest = m_eOutBufLen - m_outBufferPos;
int writeLength = std::min((length*m_inChannels) - writePos, m_eOutBufLen + bufRest);
if(bufRest < writeLength || (m_eOutBufLen == 0 && m_eosTail))
{
if(bufRest > 0)
std::memcpy(buffer + writePos, m_outBuffer + m_outBufferPos, bufRest*sizeof(sample_t));
if(!m_eosTail)
{
loadBuffer();
int len = std::min(std::abs(writeLength - bufRest), m_eOutBufLen);
std::memcpy(buffer + writePos + bufRest, m_outBuffer, len*sizeof(sample_t));
m_outBufferPos = len;
writeLength = std::min((length*m_inChannels) - writePos, m_eOutBufLen + bufRest);
}
else
{
m_outBufferPos += bufRest;
length = (writePos + bufRest) / m_inChannels;
eos = true;
return;
}
}
else
{
std::memcpy(buffer + writePos, m_outBuffer + m_outBufferPos, writeLength*sizeof(sample_t));
m_outBufferPos += writeLength;
}
writePos += writeLength;
} while(writePos < length*m_inChannels);
m_position += length;
}
void ConvolverReader::loadBuffer()
{
m_lastLengthIn = m_L;
m_reader->read(m_lastLengthIn, m_eosReader, m_outBuffer);
if(!m_eosReader || m_lastLengthIn>0)
{
divideByChannel(m_outBuffer, m_lastLengthIn*m_inChannels);
int len = m_lastLengthIn;
for(int i = 0; i < m_futures.size(); i++)
m_futures[i] = m_threadPool->enqueue(&ConvolverReader::threadFunction, this, i, true);
for(auto &fut : m_futures)
len = fut.get();
joinByChannel(0, len);
m_eOutBufLen = len*m_inChannels;
}
else if(!m_eosTail)
{
int len = m_lastLengthIn = m_L;
for(int i = 0; i < m_futures.size(); i++)
m_futures[i] = m_threadPool->enqueue(&ConvolverReader::threadFunction, this, i, false);
for(auto &fut : m_futures)
len = fut.get();
joinByChannel(0, len);
m_eOutBufLen = len*m_inChannels;
}
}
void ConvolverReader::divideByChannel(const sample_t* buffer, int len)
{
int k = 0;
for(int i = 0; i < len; i += m_inChannels)
{
for(int j = 0; j < m_inChannels; j++)
m_vecInOut[j][k] = buffer[i + j];
k++;
}
}
void ConvolverReader::joinByChannel(int start, int len)
{
int k = 0;
for(int i = 0; i < len*m_inChannels; i += m_inChannels)
{
for(int j = 0; j < m_vecInOut.size(); j++)
m_outBuffer[i + j + start] = m_vecInOut[j][k];
k++;
}
}
int ConvolverReader::threadFunction(int id, bool input)
{
int share = std::ceil((float)m_inChannels / (float)m_nChannelThreads);
int start = id*share;
int end = std::min(start + share, m_inChannels);
int l=m_lastLengthIn;
for(int i = start; i < end; i++)
if(input)
m_convolvers[i]->getNext(m_vecInOut[i], m_vecInOut[i], l, m_eosTail);
else
m_convolvers[i]->getNext(nullptr, m_vecInOut[i], l, m_eosTail);
return l;
}
AUD_NAMESPACE_END
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