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/*******************************************************************************
* Copyright 2009-2021 Jörg Müller
*
* 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 "util/RingBuffer.h"
#include <algorithm>
#include <cstring>
#include <cstdlib>
#define ALIGNMENT 32
#define ALIGN(a) (a + ALIGNMENT - ((long long)a & (ALIGNMENT-1)))
AUD_NAMESPACE_BEGIN
RingBuffer::RingBuffer(int size) :
m_buffer(size),
m_read(0),
m_write(0)
{
}
sample_t* RingBuffer::getBuffer() const
{
return m_buffer.getBuffer();
}
int RingBuffer::getSize() const
{
return m_buffer.getSize();
}
size_t RingBuffer::getReadSize() const
{
size_t read = m_read;
size_t write = m_write;
if(read > write)
return write + getSize() - read;
else
return write - read;
}
size_t RingBuffer::getWriteSize() const
{
size_t read = m_read;
size_t write = m_write;
if(read > write)
return read - write - 1;
else
return read + getSize() - write - 1;
}
size_t RingBuffer::read(data_t* target, size_t size)
{
size = std::min(size, getReadSize());
data_t* buffer = reinterpret_cast<data_t*>(m_buffer.getBuffer());
if(m_read + size > m_buffer.getSize())
{
size_t read_first = m_buffer.getSize() - m_read;
size_t read_second = size - read_first;
std::memcpy(target, buffer + m_read, read_first);
std::memcpy(target + read_first, buffer, read_second);
m_read = read_second;
}
else
{
std::memcpy(target, buffer + m_read, size);
m_read += size;
}
return size;
}
size_t RingBuffer::write(data_t* source, size_t size)
{
size = std::min(size, getWriteSize());
data_t* buffer = reinterpret_cast<data_t*>(m_buffer.getBuffer());
if(m_write + size > m_buffer.getSize())
{
size_t write_first = m_buffer.getSize() - m_write;
size_t write_second = size - write_first;
std::memcpy(buffer + m_write, source, write_first);
std::memcpy(buffer, source + write_first, write_second);
m_write = write_second;
}
else
{
std::memcpy(buffer + m_write, source, size);
m_write += size;
}
return size;
}
void RingBuffer::reset()
{
m_read = 0;
m_write = 0;
}
void RingBuffer::resize(int size)
{
m_buffer.resize(size);
reset();
}
void RingBuffer::assureSize(int size)
{
m_buffer.assureSize(size);
reset();
}
AUD_NAMESPACE_END
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