libs/ardour/audio_buffer.cc

   1 /*
   2     Copyright (C) 2006-2007 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify it
   5     under the terms of the GNU General Public License as published by the Free
   6     Software Foundation; either version 2 of the License, or (at your option)
   7     any later version.
   8
   9     This program is distributed in the hope that it will be useful, but WITHOUT
  10     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12     for more details.
  13
  14     You should have received a copy of the GNU General Public License along
  15     with this program; if not, write to the Free Software Foundation, Inc.,
  16     675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #include <errno.h>
  20
  21 #include "ardour/audio_buffer.h"
  22 #include "pbd/error.h"
  23 #include "pbd/malign.h"
  24
  25 #include "i18n.h"
  26
  27 using namespace PBD;
  28 using namespace ARDOUR;
  29
  30 AudioBuffer::AudioBuffer(size_t capacity)
  31         : Buffer(DataType::AUDIO, capacity)
  32         , _owns_data (false)
  33         , _data (0)
  34 {
  35         if (_capacity > 0) {
  36                 _owns_data = true; // prevent resize() from gagging
  37                 resize (_capacity);
  38                 _silent = false; // force silence on the intial buffer state
  39                 silence (_capacity);
  40         }
  41 }
  42
  43 AudioBuffer::~AudioBuffer()
  44 {
  45         if (_owns_data)
  46                 free(_data);
  47 }
  48
  49 void
  50 AudioBuffer::resize (size_t size)
  51 {
  52         if (!_owns_data) {
  53                 return;
  54         }
  55
  56         if (size < _capacity) {
  57                 _size = size;
  58                 return;
  59         }
  60
  61         free (_data);
  62
  63         _capacity = size;
  64         _size = size;
  65         _silent = false;
  66
  67         cache_aligned_malloc ((void**) &_data, sizeof (Sample) * _capacity);
  68 }
  69
  70