2 Copyright (C) 2006 Paul Davis
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2 of the License, or (at your option)
9 This program is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation, Inc.,
16 675 Mass Ave, Cambridge, MA 02139, USA.
19 #ifndef __ardour_buffer_h__
20 #define __ardour_buffer_h__
25 #include <boost/utility.hpp>
26 #include <ardour/types.h>
27 #include <ardour/data_type.h>
28 #include <ardour/runtime_functions.h>
33 /** A buffer of recordable/playable data.
35 * This is a datatype-agnostic base class for all buffers (there are no
36 * methods to actually access the data). This provides a way for code that
37 * doesn't care about the data type to still deal with buffers (which is
38 * why the base class can't be a template).
40 * To actually read/write buffer contents, use the appropriate derived class.
42 class Buffer : public boost::noncopyable
47 /** Factory function */
48 static Buffer* create(DataType type, size_t capacity);
50 /** Maximum capacity of buffer.
51 * Note in some cases the entire buffer may not contain valid data, use size. */
52 size_t capacity() const { return _capacity; }
54 /** Amount of valid data in buffer. Use this over capacity almost always. */
55 size_t size() const { return _size; }
57 /** Type of this buffer.
58 * Based on this you can static cast a Buffer* to the desired type. */
59 DataType type() const { return _type; }
61 bool silent() const { return _silent; }
63 /** Clear (eg zero, or empty) buffer starting at TIME @a offset */
64 virtual void silence(nframes_t len, nframes_t offset=0) = 0;
66 /** Clear the entire buffer */
67 virtual void clear() { silence(_capacity, 0); }
69 virtual void read_from(const Buffer& src, nframes_t offset, nframes_t len) = 0;
72 Buffer(DataType type, size_t capacity)
73 : _type(type), _capacity(capacity), _size(0), _silent(true)
83 /* Inside every class with a type in it's name is a template waiting to get out... */
86 /** Buffer containing 32-bit floating point (audio) data. */
87 class AudioBuffer : public Buffer
90 AudioBuffer(size_t capacity);
94 void silence(nframes_t len, nframes_t offset=0)
97 assert(_capacity > 0);
98 assert(offset + len <= _capacity);
99 memset(_data + offset, 0, sizeof (Sample) * len);
100 if (offset == 0 && len == _capacity) {
106 /** Read @a len frames FROM THE START OF @a src into self at @a offset */
107 void read_from(const Buffer& src, nframes_t len, nframes_t offset)
109 assert(_capacity > 0);
110 assert(src.type() == _type == DataType::AUDIO);
111 assert(offset + len <= _capacity);
112 memcpy(_data + offset, ((AudioBuffer&)src).data(), sizeof(Sample) * len);
113 _silent = src.silent();
116 /** Accumulate (add)@a len frames FROM THE START OF @a src into self at @a offset */
117 void accumulate_from(const AudioBuffer& src, nframes_t len, nframes_t offset)
119 assert(_capacity > 0);
120 assert(offset + len <= _capacity);
122 Sample* const dst_raw = _data + offset;
123 const Sample* const src_raw = src.data();
125 for (nframes_t n = 0; n < len; ++n) {
126 dst_raw[n] += src_raw[n];
129 _silent = (src.silent() && _silent);
132 /** Accumulate (add) @a len frames FROM THE START OF @a src into self at @a offset
133 * scaling by @a gain_coeff */
134 void accumulate_with_gain_from(const AudioBuffer& src, nframes_t len, nframes_t offset, gain_t gain_coeff)
136 assert(_capacity > 0);
137 assert(offset + len <= _capacity);
139 Sample* const dst_raw = _data + offset;
140 const Sample* const src_raw = src.data();
142 mix_buffers_with_gain (dst_raw, src_raw, len, gain_coeff);
144 _silent = ( (src.silent() && _silent) || (_silent && gain_coeff == 0) );
147 void apply_gain(gain_t gain, nframes_t len, nframes_t offset=0) {
148 apply_gain_to_buffer (_data + offset, len, gain);
151 /** Set the data contained by this buffer manually (for setting directly to jack buffer).
153 * Constructor MUST have been passed capacity=0 or this will die (to prevent mem leaks).
155 void set_data(Sample* data, size_t size)
157 assert(!_owns_data); // prevent leaks
164 const Sample* data () const { return _data; }
165 Sample* data () { return _data; }
167 const Sample* data(nframes_t nframes, nframes_t offset) const
168 { assert(offset + nframes <= _capacity); return _data + offset; }
170 Sample* data (nframes_t nframes, nframes_t offset)
171 { assert(offset + nframes <= _capacity); return _data + offset; }
175 Sample* _data; ///< Actual buffer contents
180 /** Buffer containing 8-bit unsigned char (MIDI) data. */
181 class MidiBuffer : public Buffer
184 MidiBuffer(size_t capacity);
188 void silence(nframes_t dur, nframes_t offset=0);
190 void read_from(const Buffer& src, nframes_t nframes, nframes_t offset);
192 bool push_back(const ARDOUR::MidiEvent& event);
193 Byte* reserve(nframes_t time, size_t size);
195 const MidiEvent& operator[](size_t i) const { assert(i < _size); return _events[i]; }
196 MidiEvent& operator[](size_t i) { assert(i < _size); return _events[i]; }
198 static size_t max_event_size() { return MAX_EVENT_SIZE; }
201 // FIXME: Jack needs to tell us this
202 static const size_t MAX_EVENT_SIZE = 4; // bytes
204 /* We use _size as "number of events", so the size of _data is
205 * (_size * MAX_EVENT_SIZE)
208 MidiEvent* _events; ///< Event structs that point to offsets in _data
209 Byte* _data; ///< MIDI, straight up. No time stamps.
212 } // namespace ARDOUR
214 #endif // __ardour_buffer_h__