rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 82 insertions, 0 deletions

diff --git a/libs/ardour/audio_buffer.cc b/libs/ardour/audio_buffer.cc
new file mode 100644
index 0000000000..915fdeb948
--- /dev/null
+++ b/libs/ardour/audio_buffer.cc
@@ -0,0 +1,82 @@
+/*
+    Copyright (C) 2006-2007 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.
+*/
+
+#include <ardour/audio_buffer.h>
+#include <pbd/error.h>
+#include <errno.h>
+
+#include "i18n.h"
+
+#ifdef __x86_64__
+static const int CPU_CACHE_ALIGN = 64;
+#else
+static const int CPU_CACHE_ALIGN = 16; /* arguably 32 on most arches, but it matters less */
+#endif
+
+using namespace PBD;
+
+namespace ARDOUR {
+
+
+AudioBuffer::AudioBuffer(size_t capacity)
+	: Buffer(DataType::AUDIO, capacity)
+	, _owns_data (false)
+	, _data (0)
+{
+	if (_capacity > 0) {
+		_owns_data = true; // prevent resize() from gagging
+		resize (_capacity);
+		silence (_capacity);
+	}
+}
+
+AudioBuffer::~AudioBuffer()
+{
+	if (_owns_data)
+		free(_data);
+}
+
+void
+AudioBuffer::resize (size_t size)
+{
+	if (!_owns_data || (size < _capacity)) {
+		return;
+	}
+
+	if (_data) {
+		free (_data);
+	}
+
+	_capacity = size;
+	_size = size;
+	_silent = false;
+
+#ifdef NO_POSIX_MEMALIGN
+	_data =  (Sample *) malloc(sizeof(Sample) * _capacity);
+#else
+	if (posix_memalign((void**)&_data, CPU_CACHE_ALIGN, sizeof(Sample) * _capacity)) {
+		fatal << string_compose (_("Memory allocation error: posix_memalign (%1 * %2) failed (%3)"),
+				CPU_CACHE_ALIGN, sizeof (Sample) * _capacity, strerror (errno)) << endmsg;
+	}
+#endif	
+	
+	_owns_data = true;
+}
+
+} // namespace ARDOUR
+