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/*
Copyright (C) 2006 Paul Davis
Written by Dave Robillard, 2006
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 <ardour/types.h>
#include <jack/jack.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:
/** Unfortunately using RTTI and dynamic_cast to find the type of the
* buffer is just too slow, this is done in very performance critical
* bits of the code. */
enum Type { NIL = 0, AUDIO, MIDI };
Buffer(Type 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. */
virtual Type type() const { return _type; }
/** Jack type (eg JACK_DEFAULT_AUDIO_TYPE) */
const char* jack_type() const { return type_to_jack_type(type()); }
/** String type as saved in session XML files (eg "audio" or "midi") */
const char* type_string() const { return type_to_string(type()); }
/* The below static methods need to be separate from the above methods
* because the conversion is needed in places where there's no Buffer */
static const char* type_to_jack_type(Type t) {
switch (t) {
case AUDIO: return JACK_DEFAULT_AUDIO_TYPE;
case MIDI: return JACK_DEFAULT_MIDI_TYPE;
default: return "";
}
}
static const char* type_to_string(Type t) {
switch (t) {
case AUDIO: return "audio";
case MIDI: return "midi";
default: return "unknown"; // reeeally shouldn't ever happen
}
}
/** Used for loading from XML (route default types etc) */
static Type type_from_string(const string& str) {
if (str == "audio")
return AUDIO;
else if (str == "midi")
return MIDI;
else
return NIL;
}
protected:
Type _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(AUDIO, capacity)
, _data(NULL)
{
_size = capacity; // For audio buffers, size = capacity always
posix_memalign((void**)_data, 16, sizeof(Sample) * capacity);
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* const _data; ///< Actual buffer contents
};
/** Buffer containing 8-bit unsigned char (MIDI) data. */
class MidiBuffer : public Buffer
{
public:
MidiBuffer(size_t capacity)
: Buffer(MIDI, capacity)
, _data(NULL)
{
posix_memalign((void**)_data, 16, sizeof(RawMidi) * capacity);
assert(_data);
assert(_size == 0);
memset(_data, 0, sizeof(Sample) * capacity);
}
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);
RawMidi* const _data; ///< Actual buffer contents
};
} // namespace ARDOUR
#endif // __ardour_buffer_h__
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