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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/StreamBuffer.h"
#include "util/BufferReader.h"
#include "util/Buffer.h"
#include <algorithm>
// 5 sec * 48000 samples/sec * 4 bytes/sample * 6 channels
#define BUFFER_RESIZE_BYTES 5760000
// 90 min * 60 sec/min * 48000 samples/sec * 4 bytes/sample * 2 channels
#define MAXIMUM_INITIAL_BUFFER_SIZE_BYTES 2073600000
AUD_NAMESPACE_BEGIN
StreamBuffer::StreamBuffer(std::shared_ptr<ISound> sound) :
m_buffer(new Buffer())
{
std::shared_ptr<IReader> reader = sound->createReader();
m_specs = reader->getSpecs();
int sample_size = AUD_SAMPLE_SIZE(m_specs);
int length;
long long index = 0;
bool eos = false;
// get an approximated size if possible
long long size = std::min(reader->getLength(), MAXIMUM_INITIAL_BUFFER_SIZE_BYTES / sample_size);
long long size_increase = BUFFER_RESIZE_BYTES / sample_size;
if(size <= 0)
size = size_increase;
else
size += m_specs.rate;
// as long as the end of the stream is not reached
while(!eos)
{
// increase
m_buffer->resize(static_cast<long long>(size) * sample_size, true);
// read more
length = size-index;
reader->read(length, eos, m_buffer->getBuffer() + index * m_specs.channels);
if(index == m_buffer->getSize() / sample_size)
{
size += size_increase;
size_increase <<= 1;
}
index += length;
}
m_buffer->resize(index * sample_size, true);
}
StreamBuffer::StreamBuffer(std::shared_ptr<Buffer> buffer, Specs specs) :
m_buffer(buffer), m_specs(specs)
{
}
std::shared_ptr<Buffer> StreamBuffer::getBuffer()
{
return m_buffer;
}
Specs StreamBuffer::getSpecs()
{
return m_specs;
}
std::shared_ptr<IReader> StreamBuffer::createReader()
{
return std::shared_ptr<IReader>(new BufferReader(m_buffer, m_specs));
}
AUD_NAMESPACE_END
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