libs/ardour/audio_port.cc

   1 /*
   2     Copyright (C) 2006 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 #include <cassert>
  20
  21 #include "pbd/stacktrace.h"
  22
  23 #include "ardour/audio_port.h"
  24 #include "ardour/audioengine.h"
  25 #include "ardour/data_type.h"
  26 #include "ardour/audio_buffer.h"
  27
  28 using namespace ARDOUR;
  29 using namespace std;
  30
  31 AudioPort::AudioPort (const std::string& name, Flags flags)
  32         : Port (name, DataType::AUDIO, flags)
  33         , _buffer (new AudioBuffer (0))
  34 {
  35         assert (name.find_first_of (':') == string::npos);
  36 }
  37
  38 AudioPort::~AudioPort ()
  39 {
  40         delete _buffer;
  41 }
  42
  43 void
  44 AudioPort::cycle_start (pframes_t nframes)
  45 {
  46         /* caller must hold process lock */
  47
  48         Port::cycle_start (nframes);
  49
  50         if (sends_output()) {
  51                 _buffer->prepare ();
  52         }
  53 }
  54
  55 void
  56 AudioPort::cycle_end (pframes_t nframes)
  57 {
  58         if (sends_output() && !_buffer->written()) {
  59                 /* we can't use nframes here because the current buffer capacity may
  60                    be shorter than the full buffer size if we split the cycle.
  61                 */
  62                 if (_buffer->capacity () > 0) {
  63                         _buffer->silence (_buffer->capacity());
  64                 }
  65         }
  66 }
  67
  68 void
  69 AudioPort::cycle_split ()
  70 {
  71 }
  72
  73 AudioBuffer&
  74 AudioPort::get_audio_buffer (pframes_t nframes)
  75 {
  76         /* caller must hold process lock */
  77        _buffer->set_data ((Sample *) jack_port_get_buffer (_jack_port, _cycle_nframes) +
  78                           _global_port_buffer_offset + _port_buffer_offset, nframes);
  79         return *_buffer;
  80 }
  81
  82
  83