2 Copyright (C) 2004-2011 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __ardour_panner_h__
21 #define __ardour_panner_h__
29 #include "pbd/cartesian.h"
30 #include "pbd/signals.h"
31 #include "pbd/stateful.h"
33 #include "ardour/types.h"
34 #include "ardour/automation_control.h"
35 #include "ardour/automatable.h"
37 #ifndef ARDOURPANNER_IS_IN_SHARED_LIB
38 #define ARDOURPANNER_IS_IN_SHARED_LIB 1
41 #if ARDOURPANNER_IS_IN_SHARED_LIB && !defined(ARDOURPANNER_API)
42 #define ARDOURPANNER_CAPICALLTYPE __cdecl
44 #if defined(COMPILER_MSVC) || defined(COMPILER_MINGW)
45 #if defined(BUILDING_ARDOURPANNERS)
46 #define ARDOURPANNER_LOCAL
47 #define ARDOURPANNER_API __declspec(dllexport)
49 #define ARDOURPANNER_LOCAL
50 #define ARDOURPANNER_API __declspec(dllimport)
53 #if !defined(COMPILER_GCC)
54 #warning "Attempting to export symbols with an unspecified compiler! GCC assumed!"
57 #define ARDOURPANNER_LOCAL __attribute__ ((visibility("hidden")))
58 #define ARDOURPANNER_API __attribute__ ((visibility("default")))
60 #elif !defined(ARDOURPANNER_API)
61 #define ARDOURPANNER_CAPICALLTYPE __cdecl
63 /* This library was built statically. */
64 /* Visibility is determined by the code. */
65 #define ARDOURPANNER_API
66 #define ARDOURPANNER_LOCAL
77 class Panner : public PBD::Stateful, public PBD::ScopedConnectionList
80 Panner (boost::shared_ptr<Pannable>);
83 virtual boost::shared_ptr<Speakers> get_speakers() const { return boost::shared_ptr<Speakers>(); }
85 virtual ChanCount in() const = 0;
86 virtual ChanCount out() const = 0;
88 virtual void configure_io (ARDOUR::ChanCount /*in*/, ARDOUR::ChanCount /*out*/) {}
90 /* derived implementations of these methods must indicate
91 whether it is legal for a Controllable to use the
92 value of the argument (post-call) in a call to
93 Controllable::set_value().
95 they have a choice of:
97 * return true, leave argument unchanged
98 * return true, modify argument
102 virtual bool clamp_position (double&) { return true; }
103 virtual bool clamp_width (double&) { return true; }
104 virtual bool clamp_elevation (double&) { return true; }
106 virtual std::pair<double, double> position_range () const { return std::make_pair (-DBL_MAX, DBL_MAX); }
107 virtual std::pair<double, double> width_range () const { return std::make_pair (-DBL_MAX, DBL_MAX); }
108 virtual std::pair<double, double> elevation_range () const { return std::make_pair (-DBL_MAX, DBL_MAX); }
110 virtual void set_position (double) { }
111 virtual void set_width (double) { }
112 virtual void set_elevation (double) { }
114 virtual double position () const { return 0.0; }
115 virtual double width () const { return 0.0; }
116 virtual double elevation () const { return 0.0; }
118 virtual PBD::AngularVector signal_position (uint32_t) const { return PBD::AngularVector(); }
120 virtual void reset () = 0;
122 void set_automation_state (AutoState);
123 AutoState automation_state() const;
124 void set_automation_style (AutoStyle);
125 AutoStyle automation_style() const;
127 virtual std::set<Evoral::Parameter> what_can_be_automated() const;
128 virtual std::string describe_parameter (Evoral::Parameter);
129 virtual std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
131 bool touching() const;
133 static double azimuth_to_lr_fract (double azi) {
134 /* 180.0 degrees=> left => 0.0 */
135 /* 0.0 degrees => right => 1.0 */
137 /* humans can only distinguish 1 degree of arc between two positions,
138 so force azi back to an integral value before computing
141 return 1.0 - (rint(azi)/180.0);
144 static double lr_fract_to_azimuth (double fract) {
145 /* fract = 0.0 => degrees = 180.0 => left */
146 /* fract = 1.0 => degrees = 0.0 => right */
148 /* humans can only distinguish 1 degree of arc between two positions,
149 so force azi back to an integral value after computing
152 return rint (180.0 - (fract * 180.0));
156 * Pan some input buffers to a number of output buffers.
158 * @param ibufs Input buffers (one per panner input)
159 * @param obufs Output buffers (one per panner output).
160 * @param gain_coeff fixed, additional gain coefficient to apply to output samples.
161 * @param nframes Number of frames in the input.
163 * Derived panners can choose to implement these if they need to gain more
164 * control over the panning algorithm. The default is to call
165 * distribute_one() or distribute_one_automated() on each input buffer to
166 * deliver it to each output buffer.
168 * If a panner does not need to override this default behaviour, it can
169 * just implement distribute_one() and distribute_one_automated() (below).
171 virtual void distribute (BufferSet& ibufs, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes);
172 virtual void distribute_automated (BufferSet& ibufs, BufferSet& obufs,
173 framepos_t start, framepos_t end, pframes_t nframes,
176 int set_state (const XMLNode&, int version);
177 XMLNode& get_state ();
179 boost::shared_ptr<Pannable> pannable() const { return _pannable; }
181 static bool equivalent (pan_t a, pan_t b) {
182 return fabsf (a - b) < 0.002; // about 1 degree of arc for a stereo panner
185 static bool equivalent (const PBD::AngularVector& a, const PBD::AngularVector& b) {
186 /* XXX azimuth only, at present */
187 return fabs (a.azi - b.azi) < 1.0;
190 virtual void freeze ();
191 virtual void thaw ();
194 boost::shared_ptr<Pannable> _pannable;
196 virtual void distribute_one (AudioBuffer&, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which) = 0;
197 virtual void distribute_one_automated (AudioBuffer&, BufferSet& obufs,
198 framepos_t start, framepos_t end, pframes_t nframes,
199 pan_t** buffers, uint32_t which) = 0;
207 struct PanPluginDescriptor {
211 ARDOUR::Panner* (*factory)(boost::shared_ptr<ARDOUR::Pannable>, boost::shared_ptr<ARDOUR::Speakers>);
215 #endif /* __ardour_panner_h__ */