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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 <cstdlib>
#include <cassert>
#include <iostream>
#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 Buffer
{
public:
virtual ~Buffer() {}
/** Factory function */
static Buffer* create(DataType type, size_t capacity);
/** 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; }
/** Clear (eg zero, or empty) buffer starting at TIME @a offset */
virtual void clear(jack_nframes_t offset = 0) = 0;
virtual void write(const Buffer& src, jack_nframes_t offset, jack_nframes_t len) = 0;
protected:
Buffer(DataType type, size_t capacity)
: _type(type), _capacity(capacity), _size(0)
{}
DataType _type;
size_t _capacity;
size_t _size;
private:
// Prevent copies (undefined)
Buffer(const Buffer& copy);
void operator=(const Buffer& other);
};
/* 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);
~AudioBuffer();
void clear(jack_nframes_t offset=0) { memset(_data + offset, 0, sizeof (Sample) * _capacity); }
/** Copy @a len frames starting at @a offset, from the start of @a src */
void write(const Buffer& src, jack_nframes_t offset, jack_nframes_t len)
{
assert(src.type() == _type == DataType::AUDIO);
assert(offset + len <= _capacity);
memcpy(_data + offset, ((AudioBuffer&)src).data(len, offset), sizeof(Sample) * len);
}
/** Copy @a len frames starting at @a offset, from the start of @a src */
void write(const Sample* src, jack_nframes_t offset, jack_nframes_t len)
{
assert(offset + len <= _capacity);
memcpy(_data + offset, src, sizeof(Sample) * len);
}
/** Set the data contained by this buffer manually (for setting directly to jack buffer).
*
* Constructor MUST have been passed capacity=0 or this will die (to prevent mem leaks).
*/
void set_data(Sample* data, size_t size)
{
assert(!_owns_data); // prevent leaks
_capacity = size;
_size = size;
_data = data;
}
const Sample* data(jack_nframes_t nframes, jack_nframes_t offset=0) const
{ assert(offset + nframes <= _capacity); return _data + offset; }
Sample* data(jack_nframes_t nframes, jack_nframes_t offset=0)
{ assert(offset + nframes <= _capacity); return _data + offset; }
private:
// These are undefined (prevent copies)
AudioBuffer(const AudioBuffer& copy);
AudioBuffer& operator=(const AudioBuffer& copy);
bool _owns_data;
Sample* _data; ///< Actual buffer contents
};
/** Buffer containing 8-bit unsigned char (MIDI) data. */
class MidiBuffer : public Buffer
{
public:
MidiBuffer(size_t capacity);
~MidiBuffer();
// FIXME: clear events starting at offset
void clear(jack_nframes_t offset=0) { assert(offset == 0); _size = 0; }
void write(const Buffer& src, jack_nframes_t offset, jack_nframes_t nframes);
void set_size(size_t size) { _size = size; }
const RawMidi* data() const { return _data; }
RawMidi* data() { return _data; }
private:
// These are undefined (prevent copies)
MidiBuffer(const MidiBuffer& copy);
MidiBuffer& operator=(const MidiBuffer& copy);
bool _owns_data;
RawMidi* _data; ///< Actual buffer contents
};
} // namespace ARDOUR
#endif // __ardour_buffer_h__
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