2 Copyright (C) 2008 Paul Davis
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #ifndef __ardour_export_channel_h__
22 #define __ardour_export_channel_h__
26 #include <boost/signals2.hpp>
27 #include <boost/shared_ptr.hpp>
28 #include <boost/scoped_array.hpp>
29 #include <boost/operators.hpp>
31 #include "pbd/signals.h"
33 #include "ardour/buffer_set.h"
41 class CapturingProcessor;
43 /// Export channel base class interface for different source types
44 class ExportChannel : public boost::less_than_comparable<ExportChannel>
48 virtual ~ExportChannel () {}
50 virtual void set_max_buffer_size(framecnt_t frames) { }
52 virtual void read (Sample const *& data, framecnt_t frames) const = 0;
53 virtual bool empty () const = 0;
55 /// Adds state to node passed
56 virtual void get_state (XMLNode * node) const = 0;
58 /// Sets state from node passed
59 virtual void set_state (XMLNode * node, Session & session) = 0;
61 // Operator< must be defined for usage in e.g. std::map or std::set to disallow duplicates when necessary
62 virtual bool operator< (ExportChannel const & other) const = 0;
65 /// Safe pointer for storing ExportChannels in ordered STL containers
66 class ExportChannelPtr : public boost::shared_ptr<ExportChannel>
67 , public boost::less_than_comparable<ExportChannel>
70 ExportChannelPtr () {}
71 template<typename Y> explicit ExportChannelPtr (Y * ptr) : boost::shared_ptr<ExportChannel> (ptr) {}
73 bool operator< (ExportChannelPtr const & other) const { return **this < *other; }
76 /// Basic export channel that reads from AudioPorts
77 class PortExportChannel : public ExportChannel
80 typedef std::set<AudioPort *> PortSet;
83 void set_max_buffer_size(framecnt_t frames);
85 void read (Sample const *& data, framecnt_t frames) const;
86 bool empty () const { return ports.empty(); }
88 void get_state (XMLNode * node) const;
89 void set_state (XMLNode * node, Session & session);
91 bool operator< (ExportChannel const & other) const;
93 void add_port (AudioPort * port) { ports.insert (port); }
94 PortSet const & get_ports () { return ports; }
98 boost::scoped_array<Sample> buffer;
99 framecnt_t buffer_size;
102 /// Handles RegionExportChannels and does actual reading from region
103 class RegionExportChannelFactory
112 RegionExportChannelFactory (Session * session, AudioRegion const & region, AudioTrack & track, Type type);
113 ~RegionExportChannelFactory ();
115 ExportChannelPtr create (uint32_t channel);
116 void read (uint32_t channel, Sample const *& data, framecnt_t frames_to_read);
120 int new_cycle_started (framecnt_t) { buffers_up_to_date = false; return 0; }
121 void update_buffers (framecnt_t frames);
123 AudioRegion const & region;
127 framecnt_t frames_per_cycle;
130 bool buffers_up_to_date;
131 framecnt_t region_start;
134 boost::scoped_array<Sample> mixdown_buffer;
135 boost::scoped_array<Sample> gain_buffer;
137 PBD::ScopedConnection export_connection;
140 /// Export channel that reads from region channel
141 class RegionExportChannel : public ExportChannel
143 friend class RegionExportChannelFactory;
146 void read (Sample const *& data, framecnt_t frames_to_read) const { factory.read (channel, data, frames_to_read); }
147 void get_state (XMLNode * /*node*/) const {};
148 void set_state (XMLNode * /*node*/, Session & /*session*/) {};
149 bool empty () const { return false; }
150 // Region export should never have duplicate channels, so there need not be any semantics here
151 bool operator< (ExportChannel const & other) const { return this < &other; }
155 RegionExportChannel (RegionExportChannelFactory & factory, uint32_t channel)
160 RegionExportChannelFactory & factory;
164 /// Export channel for exporting from different positions in a route
165 class RouteExportChannel : public ExportChannel
167 class ProcessorRemover; // fwd declaration
170 RouteExportChannel(boost::shared_ptr<CapturingProcessor> processor, size_t channel,
171 boost::shared_ptr<ProcessorRemover> remover);
172 ~RouteExportChannel();
174 static void create_from_route(std::list<ExportChannelPtr> & result, Route & route);
176 public: // ExportChannel interface
177 void set_max_buffer_size(framecnt_t frames);
179 void read (Sample const *& data, framecnt_t frames) const;
180 bool empty () const { return false; }
182 void get_state (XMLNode * node) const;
183 void set_state (XMLNode * node, Session & session);
185 bool operator< (ExportChannel const & other) const;
189 // Removes the processor from the track when deleted
190 class ProcessorRemover {
192 ProcessorRemover (Route & route, boost::shared_ptr<CapturingProcessor> processor)
193 : route (route), processor (processor) {}
197 boost::shared_ptr<CapturingProcessor> processor;
200 boost::shared_ptr<CapturingProcessor> processor;
202 // Each channel keeps a ref to the remover. Last one alive
203 // will cause the processor to be removed on deletion.
204 boost::shared_ptr<ProcessorRemover> remover;
207 } // namespace ARDOUR