X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Faudio_buffer.cc;h=6d8b2aa55f6d6aa8b3b6eb52e69da7c8ad11eef6;hb=f169ff3db3943b9992042e71048cade2ca1fe39d;hp=059b61ed2f1ea4a41c4446b130209c487274e8be;hpb=19273e824d40534a4e31259fb8b83122b24aa4e9;p=ardour.git

diff --git a/libs/ardour/audio_buffer.cc b/libs/ardour/audio_buffer.cc
index 059b61ed2f..6d8b2aa55f 100644
--- a/libs/ardour/audio_buffer.cc
+++ b/libs/ardour/audio_buffer.cc
@@ -1,56 +1,94 @@
 /*
-    Copyright (C) 2006-2007 Paul Davis 
-    
+    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 <errno.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
+#include "ardour/audio_buffer.h"
+#include "pbd/error.h"
+#include "pbd/malign.h"
 
-namespace ARDOUR {
+#include "i18n.h"
 
+using namespace PBD;
+using namespace ARDOUR;
 
 AudioBuffer::AudioBuffer(size_t capacity)
-	: Buffer(DataType::AUDIO, capacity)
-	, _owns_data(false)
-	, _data(NULL)
+	: Buffer (DataType::AUDIO)
+	, _owns_data (false)
+	, _data (0)
 {
-	_size = capacity; // For audio buffers, size = capacity (always)
-	if (capacity > 0) {
-#ifdef NO_POSIX_MEMALIGN
-		_data =  (Sample *) malloc(sizeof(Sample) * capacity);
-#else
-		posix_memalign((void**)&_data, CPU_CACHE_ALIGN, sizeof(Sample) * capacity);
-#endif	
-		assert(_data);
-		_owns_data = true;
-		clear();
+	if (capacity) {
+		_owns_data = true; // prevent resize() from gagging
+		resize (capacity);
+		_silent = false; // force silence on the intial buffer state
+		clear ();
 	}
 }
 
 AudioBuffer::~AudioBuffer()
 {
 	if (_owns_data)
-		free(_data);
+		cache_aligned_free(_data);
 }
 
+void
+AudioBuffer::resize (size_t size)
+{
+	if (!_owns_data) {
+		/* XXX how the hell is this enforced? */
+		_capacity = size;
+		return;
+	}
 
-} // namespace ARDOUR
+	if (_data && size < _capacity) {
+		/* buffer is already large enough */
+		return;
+	}
+
+	cache_aligned_free (_data);
 
+	cache_aligned_malloc ((void**) &_data, sizeof (Sample) * size);
+
+	_capacity = size;
+	_silent = false;
+}
+
+bool
+AudioBuffer::check_silence (pframes_t nframes, pframes_t& n) const
+{
+	for (n = 0; n < nframes; ++n) {
+		if (_data[n] != Sample (0)) {
+			return false;
+		}
+	}
+	return true;
+}
+
+void
+AudioBuffer::silence (framecnt_t len, framecnt_t offset) {
+
+	if (!_silent) {
+		assert(_capacity > 0);
+		assert(offset + len <= _capacity);
+		memset(_data + offset, 0, sizeof (Sample) * len);
+		if (len == _capacity) {
+			_silent = true;
+		}
+	}
+	_written = true;
+}