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/operators.hpp>
30 #include "pbd/signals.h"
32 #include "ardour/buffer_set.h"
41 /// Export channel base class interface for different source types
42 class ExportChannel : public boost::less_than_comparable<ExportChannel>
46 virtual ~ExportChannel () {}
48 virtual void read (Sample * data, framecnt_t frames) const = 0;
49 virtual bool empty () const = 0;
51 /// Adds state to node passed
52 virtual void get_state (XMLNode * node) const = 0;
54 /// Sets state from node passed
55 virtual void set_state (XMLNode * node, Session & session) = 0;
57 // Operator< must be defined for usage in e.g. std::map or std::set to disallow duplicates when necessary
58 virtual bool operator< (ExportChannel const & other) const = 0;
61 /// Safe pointer for storing ExportChannels in ordered STL containers
62 class ExportChannelPtr : public boost::shared_ptr<ExportChannel>
63 , public boost::less_than_comparable<ExportChannel>
66 ExportChannelPtr () {}
67 template<typename Y> explicit ExportChannelPtr (Y * ptr) : boost::shared_ptr<ExportChannel> (ptr) {}
69 bool operator< (ExportChannelPtr const & other) const { return **this < *other; }
72 /// Basic export channel that reads from AudioPorts
73 class PortExportChannel : public ExportChannel
76 typedef std::set<AudioPort *> PortSet;
78 PortExportChannel () {}
80 void read (Sample * data, framecnt_t frames) const;
81 bool empty () const { return ports.empty(); }
83 void get_state (XMLNode * node) const;
84 void set_state (XMLNode * node, Session & session);
86 bool operator< (ExportChannel const & other) const;
88 void add_port (AudioPort * port) { ports.insert (port); }
89 PortSet const & get_ports () { return ports; }
95 /// Handles RegionExportChannels and does actual reading from region
96 class RegionExportChannelFactory
105 RegionExportChannelFactory (Session * session, AudioRegion const & region, AudioTrack & track, Type type);
106 ~RegionExportChannelFactory ();
108 ExportChannelPtr create (uint32_t channel);
109 void read (uint32_t channel, Sample * data, framecnt_t frames_to_read);
113 int new_cycle_started (framecnt_t) { buffers_up_to_date = false; return 0; }
114 void update_buffers (framecnt_t frames);
116 AudioRegion const & region;
120 framecnt_t frames_per_cycle;
123 bool buffers_up_to_date;
124 framecnt_t region_start;
127 Sample * mixdown_buffer;
128 Sample * gain_buffer;
130 PBD::ScopedConnection export_connection;
133 /// Export channel that reads from region channel
134 class RegionExportChannel : public ExportChannel
136 friend class RegionExportChannelFactory;
139 void read (Sample * data, framecnt_t frames_to_read) const { factory.read (channel, data, frames_to_read); }
140 void get_state (XMLNode * /*node*/) const {};
141 void set_state (XMLNode * /*node*/, Session & /*session*/) {};
142 bool empty () const { return false; }
143 // Region export should never have duplicate channels, so there need not be any semantics here
144 bool operator< (ExportChannel const & other) const { return this < &other; }
148 RegionExportChannel (RegionExportChannelFactory & factory, uint32_t channel)
153 RegionExportChannelFactory & factory;
157 } // namespace ARDOUR