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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__
#include <stddef.h>
#include <boost/utility.hpp>
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
#include "ardour/data_type.h"
namespace ARDOUR {
/** 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 LIBARDOUR_API Buffer : public boost::noncopyable
{
public:
virtual ~Buffer() {}
/** Factory function */
static Buffer* create(DataType type, size_t capacity);
/** Maximum capacity of buffer. */
size_t capacity() const { return _capacity; }
/** Type of this buffer.
* Based on this you can static cast a Buffer* to the desired type. */
DataType type() const { return _type; }
bool silent() const { return _silent; }
/** Reallocate the buffer used internally to handle at least @a size_t units of data.
*
* The buffer is not silent after this operation. the @a capacity argument
* passed to the constructor must have been non-zero.
*/
virtual void resize (size_t) = 0;
/** Clear (eg zero, or empty) buffer */
virtual void silence (framecnt_t len, framecnt_t offset = 0) = 0;
/** Clear the entire buffer */
virtual void clear() { silence(_capacity, 0); }
virtual void read_from (const Buffer& src, framecnt_t len, frameoffset_t dst_offset = 0, frameoffset_t src_offset = 0) = 0;
virtual void merge_from (const Buffer& src, framecnt_t len, frameoffset_t dst_offset = 0, frameoffset_t src_offset = 0) = 0;
protected:
Buffer(DataType type)
: _type(type), _capacity(0), _silent (true)
{}
DataType _type;
pframes_t _capacity;
bool _silent;
};
} // namespace ARDOUR
#endif // __ardour_buffer_h__
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