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/*
* Copyright (C) 2008-2012 Sakari Bergen <sakari.bergen@beatwaves.net>
* Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
* Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2017-2019 Robin Gareus <robin@gareus.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __ardour_export_channel_h__
#define __ardour_export_channel_h__
#include <set>
#include <list>
#include <boost/scoped_array.hpp>
#include <boost/shared_ptr.hpp>
#include "pbd/signals.h"
#include "pbd/ringbuffer.h"
#include "ardour/buffer_set.h"
#include "ardour/export_pointers.h"
namespace ARDOUR {
class Session;
class AudioTrack;
class AudioPort;
class AudioRegion;
class CapturingProcessor;
/// Export channel base class interface for different source types
class LIBARDOUR_API ExportChannel : public boost::less_than_comparable<ExportChannel>
{
public:
virtual ~ExportChannel () {}
virtual samplecnt_t common_port_playback_latency () const { return 0; }
virtual void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency) { }
virtual void read (Sample const *& data, samplecnt_t samples) const = 0;
virtual bool empty () const = 0;
/// Adds state to node passed
virtual void get_state (XMLNode * node) const = 0;
/// Sets state from node passed
virtual void set_state (XMLNode * node, Session & session) = 0;
// Operator< must be defined for usage in e.g. std::map or std::set to disallow duplicates when necessary
virtual bool operator< (ExportChannel const & other) const = 0;
};
/// Basic export channel that reads from AudioPorts
class LIBARDOUR_API PortExportChannel : public ExportChannel
{
public:
typedef std::set<boost::weak_ptr<AudioPort> > PortSet;
PortExportChannel ();
~PortExportChannel ();
samplecnt_t common_port_playback_latency () const;
void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency);
void read (Sample const *& data, samplecnt_t samples) const;
bool empty () const { return ports.empty(); }
void get_state (XMLNode * node) const;
void set_state (XMLNode * node, Session & session);
bool operator< (ExportChannel const & other) const;
void add_port (boost::weak_ptr<AudioPort> port) { ports.insert (port); }
PortSet const & get_ports () { return ports; }
private:
PortSet ports;
samplecnt_t _buffer_size;
boost::scoped_array<Sample> _buffer;
std::list <boost::shared_ptr<PBD::RingBuffer<Sample> > > _delaylines;
};
/// Handles RegionExportChannels and does actual reading from region
class LIBARDOUR_API RegionExportChannelFactory
{
public:
enum Type {
None,
Raw,
Fades,
};
RegionExportChannelFactory (Session * session, AudioRegion const & region, AudioTrack & track, Type type);
~RegionExportChannelFactory ();
ExportChannelPtr create (uint32_t channel);
void read (uint32_t channel, Sample const *& data, samplecnt_t samples_to_read);
private:
int new_cycle_started (samplecnt_t) { buffers_up_to_date = false; return 0; }
void update_buffers (samplecnt_t samples);
AudioRegion const & region;
AudioTrack & track;
Type type;
samplecnt_t samples_per_cycle;
size_t n_channels;
BufferSet buffers;
bool buffers_up_to_date;
samplecnt_t region_start;
samplecnt_t position;
boost::scoped_array<Sample> mixdown_buffer;
boost::scoped_array<Sample> gain_buffer;
PBD::ScopedConnection export_connection;
};
/// Export channel that reads from region channel
class LIBARDOUR_API RegionExportChannel : public ExportChannel
{
friend class RegionExportChannelFactory;
public:
void read (Sample const *& data, samplecnt_t samples_to_read) const { factory.read (channel, data, samples_to_read); }
void get_state (XMLNode * /*node*/) const {};
void set_state (XMLNode * /*node*/, Session & /*session*/) {};
bool empty () const { return false; }
// Region export should never have duplicate channels, so there need not be any semantics here
bool operator< (ExportChannel const & other) const { return this < &other; }
private:
RegionExportChannel (RegionExportChannelFactory & factory, uint32_t channel)
: factory (factory)
, channel (channel)
{}
RegionExportChannelFactory & factory;
uint32_t channel;
};
/// Export channel for exporting from different positions in a route
class LIBARDOUR_API RouteExportChannel : public ExportChannel
{
class ProcessorRemover; // fwd declaration
public:
RouteExportChannel(boost::shared_ptr<CapturingProcessor> processor, size_t channel,
boost::shared_ptr<ProcessorRemover> remover);
~RouteExportChannel();
static void create_from_route(std::list<ExportChannelPtr> & result, boost::shared_ptr<Route> route);
public: // ExportChannel interface
void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency);
void read (Sample const *& data, samplecnt_t samples) const;
bool empty () const { return false; }
void get_state (XMLNode * node) const;
void set_state (XMLNode * node, Session & session);
bool operator< (ExportChannel const & other) const;
private:
// Removes the processor from the track when deleted
class ProcessorRemover {
public:
ProcessorRemover (boost::shared_ptr<Route> route, boost::shared_ptr<CapturingProcessor> processor)
: route (route), processor (processor) {}
~ProcessorRemover();
private:
boost::shared_ptr<Route> route;
boost::shared_ptr<CapturingProcessor> processor;
};
boost::shared_ptr<CapturingProcessor> processor;
size_t channel;
// Each channel keeps a ref to the remover. Last one alive
// will cause the processor to be removed on deletion.
boost::shared_ptr<ProcessorRemover> remover;
};
} // namespace ARDOUR
#endif
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