2 Copyright (C) 2006 Paul Davis
3 Written by Dave Robillard, 2006
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the Free
7 Software Foundation; either version 2 of the License, or (at your option)
10 This program is distributed in the hope that it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __ardour_buffer_h__
21 #define __ardour_buffer_h__
23 #define _XOPEN_SOURCE 600
24 #include <cstdlib> // for posix_memalign
26 #include <ardour/types.h>
27 #include <jack/jack.h>
32 /** A buffer of recordable/playable data.
34 * This is a datatype-agnostic base class for all buffers (there are no
35 * methods to actually access the data). This provides a way for code that
36 * doesn't care about the data type to still deal with buffers (which is
37 * why the base class can't be a template).
39 * To actually read/write buffer contents, use the appropriate derived class.
44 /** Unfortunately using RTTI and dynamic_cast to find the type of the
45 * buffer is just too slow, this is done in very performance critical
46 * bits of the code. */
47 enum Type { NIL = 0, AUDIO, MIDI };
49 Buffer(Type type, size_t capacity)
50 : _type(type), _capacity(capacity), _size(0)
55 /** Maximum capacity of buffer.
56 * Note in some cases the entire buffer may not contain valid data, use size. */
57 size_t capacity() const { return _capacity; }
59 /** Amount of valid data in buffer. Use this over capacity almost always. */
60 size_t size() const { return _size; }
62 /** Type of this buffer.
63 * Based on this you can cast a Buffer* to the desired type. */
64 virtual Type type() const { return _type; }
66 /** Jack type (eg JACK_DEFAULT_AUDIO_TYPE) */
67 const char* jack_type() const { return type_to_jack_type(type()); }
69 /** Separate for creating ports (before a buffer exists to call jack_type on) */
70 static const char* type_to_jack_type(Type t) {
72 case AUDIO: return JACK_DEFAULT_AUDIO_TYPE;
73 case MIDI: return JACK_DEFAULT_MIDI_TYPE;
85 /* Since we only have two types, templates aren't worth it, yet.. */
88 /** Buffer containing 32-bit floating point (audio) data. */
89 class AudioBuffer : public Buffer
92 AudioBuffer(size_t capacity)
93 : Buffer(AUDIO, capacity)
96 _size = capacity; // For audio buffers, size = capacity always
97 posix_memalign((void**)_data, 16, sizeof(Sample) * capacity);
99 memset(_data, 0, sizeof(Sample) * capacity);
102 const Sample* data() const { return _data; }
103 Sample* data() { return _data; }
106 // These are undefined (prevent copies)
107 AudioBuffer(const AudioBuffer& copy);
108 AudioBuffer& operator=(const AudioBuffer& copy);
110 Sample* const _data; ///< Actual buffer contents
115 /** Buffer containing 8-bit unsigned char (MIDI) data. */
116 class MidiBuffer : public Buffer
119 MidiBuffer(size_t capacity)
120 : Buffer(MIDI, capacity)
123 posix_memalign((void**)_data, 16, sizeof(RawMidi) * capacity);
126 memset(_data, 0, sizeof(Sample) * capacity);
129 const RawMidi* data() const { return _data; }
130 RawMidi* data() { return _data; }
133 // These are undefined (prevent copies)
134 MidiBuffer(const MidiBuffer& copy);
135 MidiBuffer& operator=(const MidiBuffer& copy);
137 RawMidi* const _data; ///< Actual buffer contents
141 } // namespace ARDOUR
143 #endif // __ardour_buffer_h__