/*
- 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 ();
}
}
free(_data);
}
+void
+AudioBuffer::resize (size_t size)
+{
+ if (!_owns_data) {
+ /* XXX how the hell is this enforced? */
+ _capacity = size;
+ return;
+ }
+
+ if (_data && size < _capacity) {
+ /* buffer is already large enough */
+
+ if (size < _size) {
+ /* truncate */
+ _size = size;
+ }
+
+ return;
+ }
+
+ free (_data);
-} // namespace ARDOUR
+ cache_aligned_malloc ((void**) &_data, sizeof (Sample) * size);
+ _capacity = size;
+ _size = 0;
+ _silent = false;
+}
+
+bool
+AudioBuffer::check_silence (pframes_t nframes, bool wholebuffer, pframes_t& n) const
+{
+ for (n = 0; (wholebuffer || n < _size) && n < nframes; ++n) {
+ if (_data[n] != Sample (0)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+void
+AudioBuffer::silence (framecnt_t len, framecnt_t offset) {
+ pframes_t n = 0;
+ if (!_silent) {
+ assert(_capacity > 0);
+ assert(offset + len <= _capacity);
+ memset(_data + offset, 0, sizeof (Sample) * len);
+ if (len == _capacity) {
+ _silent = true;
+ }
+ }
+ _written = true;
+}