fix crash when copy'ing latent plugins

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

diff --git a/libs/ardour/audio_buffer.cc b/libs/ardour/audio_buffer.cc
index 915fdeb948adc75ec1d988ca2638cd59891dc962..89e210c7728a7c323e8bc3940264a71fcae6c2fd 100644 (file)
--- a/libs/ardour/audio_buffer.cc
+++ b/libs/ardour/audio_buffer.cc
@@ -1,82 +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 <pbd/error.h>
 #include <errno.h>
 
-#include "i18n.h"
+#include "ardour/audio_buffer.h"
+#include "pbd/error.h"
+#include "pbd/malign.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 "pbd/i18n.h"
 
 using namespace PBD;
-
-namespace ARDOUR {
-
+using namespace ARDOUR;
 
 AudioBuffer::AudioBuffer(size_t capacity)
-       : Buffer(DataType::AUDIO, capacity)
+       : Buffer (DataType::AUDIO)
        , _owns_data (false)
        , _data (0)
 {
-       if (_capacity > 0) {
+       if (capacity) {
                _owns_data = true; // prevent resize() from gagging
-               resize (_capacity);
-               silence (_capacity);
+               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 || (size < _capacity)) {
+       if (!_owns_data) {
+               /* XXX how the hell is this enforced? */
+               _capacity = size;
                return;
        }
 
-       if (_data) {
-               free (_data);
+       if (_data && size < _capacity) {
+               /* buffer is already large enough */
+               return;
        }
 
+       cache_aligned_free (_data);
+
+       cache_aligned_malloc ((void**) &_data, sizeof (Sample) * size);
+
        _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;
+bool
+AudioBuffer::check_silence (pframes_t nframes, pframes_t& n) const
+{
+       for (n = 0; n < nframes; ++n) {
+               if (_data[n] != Sample (0)) {
+                       return false;
+               }
        }
-#endif 
-       
-       _owns_data = true;
+       return true;
 }
 
-} // namespace ARDOUR
+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;
+}