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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.
00045 class Buffer
      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. */
00056       size_t capacity() const { return _capacity; }

      /** Amount of valid data in buffer.  Use this over capacity almost always. */
00059       size_t size() const { return _size; }

      /** Type of this buffer.
       * Based on this you can static cast a Buffer* to the desired type. */
00063       DataType type() const { return _type; }

      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. */
00076 class AudioBuffer : public Buffer
      AudioBuffer(size_t capacity)
            : Buffer(DataType::AUDIO, capacity)
            , _data(NULL)
            _size = capacity; // For audio buffers, size = capacity (always)
            _data =  (Sample *) malloc(sizeof(Sample) * capacity);
            posix_memalign((void**)_data, 16, sizeof(Sample) * capacity);
            memset(_data, 0, sizeof(Sample) * capacity);

      const Sample* data() const { return _data; }
      Sample*       data()       { return _data; }

      // These are undefined (prevent copies)
      AudioBuffer(const AudioBuffer& copy);            
      AudioBuffer& operator=(const AudioBuffer& copy);

00101       Sample* _data; ///< Actual buffer contents

} // namespace ARDOUR

#endif // __ardour_buffer_h__

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