294 lines
8.2 KiB
C++
294 lines
8.2 KiB
C++
/*
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* Copyright (C) 2008-2012 Sakari Bergen <sakari.bergen@beatwaves.net>
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* Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2017-2022 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __ardour_export_channel_h__
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#define __ardour_export_channel_h__
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#include <list>
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#include <memory>
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#include <set>
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#include <boost/scoped_array.hpp>
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#include "pbd/ringbuffer.h"
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#include "pbd/signals.h"
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#include "ardour/audio_buffer.h"
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#include "ardour/buffer_set.h"
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#include "ardour/export_pointers.h"
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#include "ardour/fixed_delay.h"
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#include "ardour/midi_buffer.h"
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namespace ARDOUR {
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class Session;
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class AudioTrack;
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class AudioPort;
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class AudioRegion;
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class CapturingProcessor;
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class MidiPort;
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/// Export channel base class interface for different source types
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class LIBARDOUR_API ExportChannel : public boost::less_than_comparable<ExportChannel>
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{
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public:
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virtual ~ExportChannel () {}
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virtual samplecnt_t common_port_playback_latency () const { return 0; }
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virtual void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency) {}
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virtual void read (Buffer const*&, samplecnt_t samples) const = 0;
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virtual bool empty () const = 0;
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virtual bool audio () const { return true; }
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virtual bool midi () const { return false; }
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virtual std::string state_node_name () const = 0;
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/// Adds state to node passed
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virtual void get_state (XMLNode* node) const = 0;
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/// Sets state from node passed
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virtual void set_state (XMLNode* node, Session& session) = 0;
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// Operator< must be defined for usage in e.g. std::map or std::set to disallow duplicates when necessary
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virtual bool operator< (ExportChannel const& other) const = 0;
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};
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/// Basic export channel that reads from AudioPorts
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class LIBARDOUR_API PortExportChannel : public ExportChannel
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{
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public:
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typedef std::set<std::weak_ptr<AudioPort>, std::owner_less<std::weak_ptr<AudioPort>>> PortSet;
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PortExportChannel ();
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~PortExportChannel ();
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samplecnt_t common_port_playback_latency () const;
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void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency);
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void read (Buffer const*&, samplecnt_t samples) const;
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bool empty () const { return ports.empty (); }
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std::string state_node_name () const { return "PortExportChannel"; }
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void get_state (XMLNode* node) const;
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void set_state (XMLNode* node, Session& session);
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bool operator< (ExportChannel const& other) const;
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void add_port (std::weak_ptr<AudioPort> port) { ports.insert (port); }
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PortSet const& get_ports () const { return ports; }
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private:
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PortSet ports;
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samplecnt_t _buffer_size;
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boost::scoped_array<Sample> _buffer;
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mutable AudioBuffer _buf;
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std::list<std::shared_ptr<PBD::RingBuffer<Sample>>> _delaylines;
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};
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/// Basic export channel that reads from MIDIPorts
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class LIBARDOUR_API PortExportMIDI : public ExportChannel
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{
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public:
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PortExportMIDI ();
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~PortExportMIDI ();
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/* ExportChannel interface */
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samplecnt_t common_port_playback_latency () const;
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void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency);
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void read (Buffer const*&, samplecnt_t samples) const;
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bool empty () const { return _port.expired (); }
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bool audio () const { return false; }
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bool midi () const { return true; }
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std::string state_node_name () const { return "PortExportMIDI"; }
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void get_state (XMLNode* node) const;
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void set_state (XMLNode* node, Session& session);
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bool operator< (ExportChannel const& other) const;
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std::shared_ptr<MidiPort> port () const { return _port.lock (); }
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void set_port (std::weak_ptr<MidiPort> port)
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{
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_port = port;
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}
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private:
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std::weak_ptr<MidiPort> _port;
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mutable FixedDelay _delayline;
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mutable MidiBuffer _buf;
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};
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/// Handles RegionExportChannels and does actual reading from region
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class LIBARDOUR_API RegionExportChannelFactory
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{
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public:
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enum Type {
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None,
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Raw,
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Fades,
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};
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RegionExportChannelFactory (Session* session, AudioRegion const& region, AudioTrack& track, Type type);
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~RegionExportChannelFactory ();
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ExportChannelPtr create (uint32_t channel);
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void read (uint32_t channel, Buffer const*&, samplecnt_t samples_to_read);
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private:
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int new_cycle_started (samplecnt_t)
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{
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buffers_up_to_date = false;
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return 0;
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}
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void update_buffers (samplecnt_t samples);
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AudioRegion const& region;
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Type type;
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samplecnt_t samples_per_cycle;
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size_t n_channels;
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BufferSet buffers;
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bool buffers_up_to_date;
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samplepos_t region_start;
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samplepos_t position;
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boost::scoped_array<Sample> mixdown_buffer;
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boost::scoped_array<Sample> gain_buffer;
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PBD::ScopedConnection export_connection;
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};
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/// Export channel that reads from region channel
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class LIBARDOUR_API RegionExportChannel : public ExportChannel
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{
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friend class RegionExportChannelFactory;
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public:
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void read (Buffer const*& buf, samplecnt_t samples_to_read) const
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{
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factory.read (channel, buf, samples_to_read);
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}
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std::string state_node_name () const { return "RegionExportChannel"; }
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void get_state (XMLNode* /*node*/) const {};
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void set_state (XMLNode* /*node*/, Session& /*session*/){};
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bool empty () const { return false; }
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// Region export should never have duplicate channels, so there need not be any semantics here
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bool operator< (ExportChannel const& other) const
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{
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return this < &other;
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}
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private:
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RegionExportChannel (RegionExportChannelFactory& factory, uint32_t channel)
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: factory (factory)
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, channel (channel)
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{
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}
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RegionExportChannelFactory& factory;
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uint32_t channel;
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};
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/// Export channel for exporting from different positions in a route
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class LIBARDOUR_API RouteExportChannel : public ExportChannel
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{
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class ProcessorRemover; // fwd declaration
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public:
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RouteExportChannel (std::shared_ptr<CapturingProcessor> processor,
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DataType type,
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size_t channel,
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std::shared_ptr<ProcessorRemover> remover);
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~RouteExportChannel ();
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static void create_from_route (std::list<ExportChannelPtr>& result, std::shared_ptr<Route> route);
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static void create_from_state (std::list<ExportChannelPtr>& result, Session&, XMLNode*);
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public: // ExportChannel interface
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void prepare_export (samplecnt_t max_samples, sampleoffset_t common_latency);
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void read (Buffer const*&, samplecnt_t samples) const;
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bool empty () const { return false; }
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bool audio () const;
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bool midi () const;
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std::shared_ptr<Route> route () const { return _remover->route (); }
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std::string state_node_name () const { return "RouteExportChannel"; }
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void get_state (XMLNode* node) const;
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void set_state (XMLNode* node, Session& session);
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bool operator< (ExportChannel const& other) const;
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private:
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// Removes the processor from the track when deleted
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class ProcessorRemover
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{
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public:
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ProcessorRemover (std::shared_ptr<Route> route, std::shared_ptr<CapturingProcessor> processor)
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: _route (route)
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, _processor (processor)
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{
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}
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~ProcessorRemover ();
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std::shared_ptr<Route> route () const { return _route; }
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private:
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std::shared_ptr<Route> _route;
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std::shared_ptr<CapturingProcessor> _processor;
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};
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std::shared_ptr<CapturingProcessor> _processor;
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DataType _type;
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size_t _channel;
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// Each channel keeps a ref to the remover. Last one alive
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// will cause the processor to be removed on deletion.
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std::shared_ptr<ProcessorRemover> _remover;
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};
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} // namespace ARDOUR
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#endif
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