libs/ardour/thread_buffers.cc

   1 /*
   2     Copyright (C) 2010 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <iostream>
  21 #include <algorithm>
  22
  23 #include "ardour/audioengine.h"
  24 #include "ardour/buffer_set.h"
  25 #include "ardour/thread_buffers.h"
  26
  27 using namespace ARDOUR;
  28 using namespace std;
  29
  30 ThreadBuffers::ThreadBuffers ()
  31         : silent_buffers (new BufferSet)
  32         , scratch_buffers (new BufferSet)
  33         , mix_buffers (new BufferSet)
  34         , gain_automation_buffer (0)
  35         , pan_automation_buffer (0)
  36         , npan_buffers (0)
  37 {
  38 }
  39
  40 void
  41 ThreadBuffers::ensure_buffers (ChanCount howmany)
  42 {
  43         // std::cerr << "ThreadBuffers " << this << " resize buffers with count = " << howmany << std::endl;
  44
  45         /* this is all protected by the process lock in the Session
  46          */
  47
  48         if (howmany.n_total() == 0) {
  49                 return;
  50         }
  51
  52         AudioEngine* _engine = AudioEngine::instance ();
  53
  54         for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
  55                 size_t count = std::max (scratch_buffers->available().get(*t), howmany.get(*t));
  56                 size_t size = _engine->raw_buffer_size (*t);
  57
  58                 scratch_buffers->ensure_buffers (*t, count, size);
  59                 mix_buffers->ensure_buffers (*t, count, size);
  60                 silent_buffers->ensure_buffers (*t, count, size);
  61         }
  62
  63         delete [] gain_automation_buffer;
  64         gain_automation_buffer = new gain_t[_engine->raw_buffer_size (DataType::AUDIO)];
  65
  66         allocate_pan_automation_buffers (_engine->raw_buffer_size (DataType::AUDIO), howmany.n_audio(), false);
  67 }
  68
  69 void
  70 ThreadBuffers::allocate_pan_automation_buffers (framecnt_t nframes, uint32_t howmany, bool force)
  71 {
  72         /* we always need at least 2 pan buffers */
  73
  74         howmany = max (2U, howmany);
  75
  76         if (!force && howmany <= npan_buffers) {
  77                 return;
  78         }
  79
  80         if (pan_automation_buffer) {
  81
  82                 for (uint32_t i = 0; i < npan_buffers; ++i) {
  83                         delete [] pan_automation_buffer[i];
  84                 }
  85
  86                 delete [] pan_automation_buffer;
  87         }
  88
  89         pan_automation_buffer = new pan_t*[howmany];
  90
  91         for (uint32_t i = 0; i < howmany; ++i) {
  92                 pan_automation_buffer[i] = new pan_t[nframes];
  93         }
  94
  95         npan_buffers = howmany;
  96 }