Initialize uninitialized variable

[ardour.git] / libs / ardour / audio_buffer.cc

diff --git a/libs/ardour/audio_buffer.cc b/libs/ardour/audio_buffer.cc
index 059b61ed2f1ea4a41c4446b130209c487274e8be..afc1e14ccad7d95c1b329286da352f9bcb88004d 100644 (file)
--- a/libs/ardour/audio_buffer.cc
+++ b/libs/ardour/audio_buffer.cc
@@ -1,56 +1,96 @@
 /*
-    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>
-
-#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
-
-namespace ARDOUR {
+ * Copyright (C) 2007-2010 David Robillard <d@drobilla.net>
+ * Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
+ * Copyright (C) 2013-2014 Robin Gareus <robin@gareus.org>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
 
+#include <errno.h>
+
+#include "ardour/audio_buffer.h"
+#include "pbd/error.h"
+#include "pbd/malign.h"
+
+#include "pbd/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 (samplecnt_t len, samplecnt_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;
+}