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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/jack_audio_port.h>
#include <ardour/audioengine.h>
#include <ardour/data_type.h>
using namespace ARDOUR;
using namespace std;
AudioPort::AudioPort (const std::string& name, Flags flags, bool external, nframes_t capacity)
: Port (name, flags)
, BaseAudioPort (name, flags)
, PortFacade (name, flags)
, _has_been_mixed_down( false )
{
if (!external || receives_input()) {
/* internal-only and input ports need their own buffers.
external output ports use the external port buffer.
*/
_buffer = new AudioBuffer (capacity);
_own_buffer = true;
}
if (!external) {
_ext_port = 0;
set_name (name);
} else {
/* make the JackAudioPort create its own buffer. For input,
we will copy from it during cycle_start(). For output,
we will set up our buffer to point to its buffer, which
will in turn be using the JACK port buffer for data.
*/
_ext_port = new JackAudioPort (name, flags, 0);
//if (sends_output()) {
// _buffer = &dynamic_cast<JackAudioPort*>(_ext_port)->get_audio_buffer( nframes, offset );
//}
Port::set_name (_ext_port->name());
}
reset ();
}
AudioPort::~AudioPort()
{
delete _ext_port;
_ext_port = 0;
}
void
AudioPort::reset()
{
BaseAudioPort::reset();
if (_ext_port) {
_ext_port->reset ();
}
}
void
AudioPort::cycle_start (nframes_t nframes, nframes_t offset)
{
/* caller must hold process lock */
if (_ext_port) {
_ext_port->cycle_start (nframes, offset);
}
_has_been_mixed_down = false;
}
AudioBuffer &
AudioPort::get_audio_buffer( nframes_t nframes, nframes_t offset ) {
if (_has_been_mixed_down)
return *_buffer;
if (_flags & IsInput) {
if (_ext_port) {
_buffer->read_from (dynamic_cast<BaseAudioPort*>(_ext_port)->get_audio_buffer (nframes, offset), nframes, offset);
if (!_connections.empty()) {
(*_mixdown) (_connections, _buffer, nframes, offset, false);
}
} else {
if (_connections.empty()) {
_buffer->silence (nframes, offset);
} else {
(*_mixdown) (_connections, _buffer, nframes, offset, true);
}
}
} else {
// XXX if we could get the output stage to not purely mix into, but also
// to initially overwrite the buffer, we could avoid this silence step.
if (_ext_port) {
_buffer = & (dynamic_cast<BaseAudioPort*>(_ext_port)->get_audio_buffer( nframes, offset ));
}
if (nframes)
_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;
}
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