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/*******************************************************************************
* Copyright 2009-2016 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/BufferReader.h"
#include "util/Buffer.h"
#include <cstring>
AUD_NAMESPACE_BEGIN
BufferReader::BufferReader(std::shared_ptr<Buffer> buffer,
Specs specs) :
m_position(0), m_buffer(buffer), m_specs(specs)
{
}
bool BufferReader::isSeekable() const
{
return true;
}
void BufferReader::seek(int position)
{
m_position = position;
}
int BufferReader::getLength() const
{
return m_buffer->getSize() / AUD_SAMPLE_SIZE(m_specs);
}
int BufferReader::getPosition() const
{
return m_position;
}
Specs BufferReader::getSpecs() const
{
return m_specs;
}
void BufferReader::read(int& length, bool& eos, sample_t* buffer)
{
eos = false;
int sample_size = AUD_SAMPLE_SIZE(m_specs);
sample_t* buf = m_buffer->getBuffer() + m_position * m_specs.channels;
// in case the end of the buffer is reached
if(m_buffer->getSize() < (m_position + length) * sample_size)
{
length = m_buffer->getSize() / sample_size - m_position;
eos = true;
}
if(length < 0)
{
length = 0;
return;
}
m_position += length;
std::memcpy(buffer, buf, length * sample_size);
}
AUD_NAMESPACE_END
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