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/*
Copyright (C) 2006 Paul Davis
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program 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 General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_buffer_h__
#define __ardour_buffer_h__
#define _XOPEN_SOURCE 600
#include <cstdlib> // for posix_memalign
#include <cassert>
#include <cstring>
#include <ardour/types.h>
#include <ardour/data_type.h>
namespace ARDOUR {
/* Yes, this is a bit of a mess right now. I'll clean it up when everything
* using it works out.. */
/** A buffer of recordable/playable data.
*
* This is a datatype-agnostic base class for all buffers (there are no
* methods to actually access the data). This provides a way for code that
* doesn't care about the data type to still deal with buffers (which is
* why the base class can't be a template).
*
* To actually read/write buffer contents, use the appropriate derived class.
*/
class Buffer
{
public:
Buffer(DataType type, size_t capacity)
: _type(type), _capacity(capacity), _size(0)
{}
virtual ~Buffer() {}
/** Maximum capacity of buffer.
* Note in some cases the entire buffer may not contain valid data, use size. */
size_t capacity() const { return _capacity; }
/** Amount of valid data in buffer. Use this over capacity almost always. */
size_t size() const { return _size; }
/** Type of this buffer.
* Based on this you can static cast a Buffer* to the desired type. */
DataType type() const { return _type; }
protected:
DataType _type;
size_t _capacity;
size_t _size;
};
/* Inside every class with a type in it's name is a template waiting to get out... */
/** Buffer containing 32-bit floating point (audio) data. */
class AudioBuffer : public Buffer
{
public:
AudioBuffer(size_t capacity)
: Buffer(DataType::AUDIO, capacity)
, _data(NULL)
{
_size = capacity; // For audio buffers, size = capacity (always)
#ifdef NO_POSIX_MEMALIGN
_data = (Sample *) malloc(sizeof(Sample) * capacity);
#else
posix_memalign((void**)_data, 16, sizeof(Sample) * capacity);
#endif
assert(_data);
memset(_data, 0, sizeof(Sample) * capacity);
}
const Sample* data() const { return _data; }
Sample* data() { return _data; }
private:
// These are undefined (prevent copies)
AudioBuffer(const AudioBuffer& copy);
AudioBuffer& operator=(const AudioBuffer& copy);
Sample* _data; ///< Actual buffer contents
};
} // namespace ARDOUR
#endif // __ardour_buffer_h__
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