audio_port.cc

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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 "pbd/stacktrace.h"

#include "ardour/audio_buffer.h"
#include "ardour/audioengine.h"
#include "ardour/audio_port.h"
#include "ardour/data_type.h"
#include "ardour/port_engine.h"

using namespace ARDOUR;
using namespace std;

#define port_engine AudioEngine::instance()->port_engine()

AudioPort::AudioPort (const std::string& name, PortFlags flags)
        : Port (name, DataType::AUDIO, flags)
        , _buffer (new AudioBuffer (0))
{
        assert (name.find_first_of (':') == string::npos);
}

AudioPort::~AudioPort ()
{
        delete _buffer;
}

void
AudioPort::cycle_start (pframes_t nframes)
{
        /* caller must hold process lock */

        Port::cycle_start (nframes);

        if (sends_output()) {
                _buffer->prepare ();
        }
}

void
AudioPort::cycle_end (pframes_t nframes)
{
        if (sends_output() && !_buffer->written()) {
                if (_buffer->capacity() >= nframes) {
                        _buffer->silence (nframes);
                }
        }
}

void
AudioPort::cycle_split ()
{
}

AudioBuffer&
AudioPort::get_audio_buffer (pframes_t nframes)
{
        /* caller must hold process lock */
        _buffer->set_data ((Sample *) port_engine.get_buffer (_port_handle, _cycle_nframes) +
                           _global_port_buffer_offset + _port_buffer_offset, nframes);
        return *_buffer;
}

Sample* 
AudioPort::engine_get_whole_audio_buffer ()
{
        /* caller must hold process lock */
        return (Sample *) port_engine.get_buffer (_port_handle, _cycle_nframes);
}