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/*
Copyright (C) 2006 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 <cassert>
#include <ardour/audio_port.h>
#include <ardour/audioengine.h>
#include <ardour/data_type.h>
#include <ardour/audio_buffer.h>
using namespace ARDOUR;
using namespace std;
AudioPort::AudioPort (const std::string& name, Flags flags, bool ext, nframes_t capacity)
: Port (name, DataType::AUDIO, flags, ext)
, _has_been_mixed_down (false)
, _buffer (0)
{
assert (name.find_first_of (':') == string::npos);
if (external ()) {
/* external ports use the external port buffer */
_buffer = new AudioBuffer (0);
} else {
/* internal ports need their own buffers */
_buffer = new AudioBuffer (capacity);
}
}
AudioPort::~AudioPort()
{
delete _buffer;
}
void
AudioPort::cycle_start (nframes_t nframes, nframes_t offset)
{
/* caller must hold process lock */
_has_been_mixed_down = false;
if (external ()) {
/* external ports use JACK's memory */
_buffer->set_data ((Sample *) jack_port_get_buffer (_jack_port, nframes), nframes + offset);
}
}
AudioBuffer &
AudioPort::get_audio_buffer (nframes_t nframes, nframes_t offset)
{
/* caller must hold process lock */
if (_has_been_mixed_down) {
return *_buffer;
}
if (receives_input ()) {
/* INPUT */
/* If we're external (), we have some data in our buffer set up by JACK;
otherwise, we have an undefined buffer. In either case we mix down
our non-JACK inputs; either accumulating into the JACK data or
overwriting the undefined data */
mixdown (nframes, offset, !external ());
} else {
/* OUTPUT */
if (!external ()) {
/* start internal output buffers with silence */
_buffer->silence (nframes, offset);
}
}
if (nframes) {
_has_been_mixed_down = true;
}
return *_buffer;
}
void
AudioPort::cycle_end (nframes_t nframes, nframes_t offset)
{
_has_been_mixed_down = false;
}
void
AudioPort::mixdown (nframes_t cnt, nframes_t offset, bool first_overwrite)
{
if (_connections.empty()) {
if (first_overwrite) {
_buffer->silence (cnt, offset);
}
return;
}
set<Port*>::const_iterator p = _connections.begin();
if (first_overwrite) {
_buffer->read_from (dynamic_cast<AudioPort*>(*p)->get_audio_buffer (cnt, offset), cnt, offset);
++p;
}
for (; p != _connections.end (); ++p) {
_buffer->accumulate_from (dynamic_cast<AudioPort*>(*p)->get_audio_buffer (cnt, offset), cnt, offset);
}
}
void
AudioPort::reset ()
{
Port::reset ();
if (_buffer->capacity () != 0) {
_buffer->resize (_engine->frames_per_cycle ());
_buffer->clear ();
}
}
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