/*
- Copyright (C) 2006 Paul Davis
-
+ 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 <cstdlib>
#include <cassert>
-#include <ardour/types.h>
-#include <ardour/data_type.h>
-
-namespace ARDOUR {
+#include <cstring>
+#include <iostream>
+#include <boost/utility.hpp>
+#include "ardour/types.h"
+#include "ardour/data_type.h"
+#include "ardour/runtime_functions.h"
-/* Yes, this is a bit of a mess right now. I'll clean it up when everything
- * using it works out.. */
+namespace ARDOUR {
/** A buffer of recordable/playable data.
* 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
+class Buffer : public boost::noncopyable
{
public:
- Buffer(DataType type, size_t capacity)
- : _type(type), _capacity(capacity), _size(0)
- {}
-
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; }
* Based on this you can static cast a Buffer* to the desired type. */
DataType type() const { return _type; }
-protected:
- DataType _type;
- size_t _capacity;
- size_t _size;
-};
+ bool silent() const { return _silent; }
+ void is_silent(bool yn) { _silent = yn; }
+ /** Reallocate the buffer used internally to handle at least @a size_t units of data.
+ *
+ * The buffer is not silent after this operation. the @a capacity argument
+ * passed to the constructor must have been non-zero.
+ */
+ virtual void resize (size_t) = 0;
-/* Inside every class with a type in it's name is a template waiting to get out... */
+ /** Clear (eg zero, or empty) buffer */
+ virtual void silence (nframes_t len, nframes_t offset = 0) = 0;
+ /** Clear the entire buffer */
+ virtual void clear() { silence(_capacity, 0); }
-/** Buffer containing 32-bit floating point (audio) data. */
-class AudioBuffer : public Buffer
-{
-public:
- AudioBuffer(size_t capacity)
- : Buffer(DataType::AUDIO, capacity)
- , _data(NULL)
- {
- _size = capacity; // For audio buffers, size = capacity (always)
-#ifdef NO_POSIX_MEMALIGN
- _data = (Sample *) malloc(sizeof(Sample) * capacity);
-#else
- posix_memalign((void**)_data, 16, sizeof(Sample) * capacity);
-#endif
- 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* _data; ///< Actual buffer contents
+ virtual void read_from (const Buffer& src, nframes_t len, nframes_t dst_offset = 0, nframes_t src_offset = 0) = 0;
+ virtual void merge_from (const Buffer& src, nframes_t len, nframes_t dst_offset = 0, nframes_t src_offset = 0) = 0;
+
+ protected:
+ Buffer(DataType type, size_t capacity)
+ : _type(type), _capacity(capacity), _size(0), _silent(true)
+ {}
+
+ DataType _type;
+ size_t _capacity;
+ size_t _size;
+ bool _silent;
};