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 #if !defined(ARDOURPANNER_IS_IN_WINDLL)
38 #if defined(COMPILER_MSVC) || defined(COMPILER_MINGW)
39 // If you need '__declspec' compatibility, add extra compilers to the above as necessary
40 #define ARDOURPANNER_IS_IN_WINDLL 1
42 #define ARDOURPANNER_IS_IN_WINDLL 0
46 #if ARDOURPANNER_IS_IN_WINDLL && !defined(ARDOURPANNER_API)
47 #if defined(BUILDING_ARDOURPANNERS)
48 #define ARDOURPANNER_API __declspec(dllexport)
49 #define ARDOURPANNER_APICALLTYPE __thiscall
50 #define ARDOURPANNER_CAPICALLTYPE __cdecl
51 #elif defined(COMPILER_MSVC) || defined(COMPILER_MINGW) // Probably needs Cygwin too, at some point
52 #define ARDOURPANNER_API __declspec(dllimport)
53 #define ARDOURPANNER_APICALLTYPE __thiscall
54 #define ARDOURPANNER_CAPICALLTYPE __cdecl
56 #error "Attempting to define __declspec with an incompatible compiler !"
58 #elif !defined(ARDOURPANNER_API)
59 // Other compilers / platforms could be accommodated here
60 #define ARDOURPANNER_API
61 #define ARDOURPANNER_APICALLTYPE
62 #define ARDOURPANNER_CAPICALLTYPE
73 class Panner : public PBD::Stateful, public PBD::ScopedConnectionList
76 Panner (boost::shared_ptr<Pannable>);
79 virtual boost::shared_ptr<Speakers> get_speakers() const { return boost::shared_ptr<Speakers>(); }
81 virtual ChanCount in() const = 0;
82 virtual ChanCount out() const = 0;
84 virtual void configure_io (ARDOUR::ChanCount /*in*/, ARDOUR::ChanCount /*out*/) {}
86 /* derived implementations of these methods must indicate
87 whether it is legal for a Controllable to use the
88 value of the argument (post-call) in a call to
89 Controllable::set_value().
91 they have a choice of:
93 * return true, leave argument unchanged
94 * return true, modify argument
98 virtual bool ARDOURPANNER_APICALLTYPE clamp_position (double&) { return true; }
99 virtual bool clamp_width (double&) { return true; }
100 virtual bool clamp_elevation (double&) { return true; }
102 virtual std::pair<double, double> position_range () const { return std::make_pair (-DBL_MAX, DBL_MAX); }
103 virtual std::pair<double, double> width_range () const { return std::make_pair (-DBL_MAX, DBL_MAX); }
104 virtual std::pair<double, double> elevation_range () const { return std::make_pair (-DBL_MAX, DBL_MAX); }
106 virtual void ARDOURPANNER_APICALLTYPE set_position (double) { }
107 virtual void set_width (double) { }
108 virtual void set_elevation (double) { }
110 virtual double position () const { return 0.0; }
111 virtual double width () const { return 0.0; }
112 virtual double elevation () const { return 0.0; }
114 virtual PBD::AngularVector signal_position (uint32_t) const { return PBD::AngularVector(); }
116 virtual void reset () = 0;
118 void set_automation_state (AutoState);
119 AutoState automation_state() const;
120 void set_automation_style (AutoStyle);
121 AutoStyle automation_style() const;
123 virtual std::set<Evoral::Parameter> what_can_be_automated() const;
124 virtual std::string describe_parameter (Evoral::Parameter);
125 virtual std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
127 bool touching() const;
129 static double azimuth_to_lr_fract (double azi) {
130 /* 180.0 degrees=> left => 0.0 */
131 /* 0.0 degrees => right => 1.0 */
133 /* humans can only distinguish 1 degree of arc between two positions,
134 so force azi back to an integral value before computing
137 return 1.0 - (rint(azi)/180.0);
140 static double lr_fract_to_azimuth (double fract) {
141 /* fract = 0.0 => degrees = 180.0 => left */
142 /* fract = 1.0 => degrees = 0.0 => right */
144 /* humans can only distinguish 1 degree of arc between two positions,
145 so force azi back to an integral value after computing
148 return rint (180.0 - (fract * 180.0));
152 * Pan some input buffers to a number of output buffers.
154 * @param ibufs Input buffers (one per panner input)
155 * @param obufs Output buffers (one per panner output).
156 * @param gain_coeff fixed, additional gain coefficient to apply to output samples.
157 * @param nframes Number of frames in the input.
159 * Derived panners can choose to implement these if they need to gain more
160 * control over the panning algorithm. The default is to call
161 * distribute_one() or distribute_one_automated() on each input buffer to
162 * deliver it to each output buffer.
164 * If a panner does not need to override this default behaviour, it can
165 * just implement distribute_one() and distribute_one_automated() (below).
167 virtual void distribute (BufferSet& ibufs, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes);
168 virtual void distribute_automated (BufferSet& ibufs, BufferSet& obufs,
169 framepos_t start, framepos_t end, pframes_t nframes,
172 int set_state (const XMLNode&, int version);
173 XMLNode& get_state ();
175 boost::shared_ptr<Pannable> pannable() const { return _pannable; }
177 static bool equivalent (pan_t a, pan_t b) {
178 return fabsf (a - b) < 0.002; // about 1 degree of arc for a stereo panner
181 static bool equivalent (const PBD::AngularVector& a, const PBD::AngularVector& b) {
182 /* XXX azimuth only, at present */
183 return fabs (a.azi - b.azi) < 1.0;
186 virtual void freeze ();
187 virtual void thaw ();
190 boost::shared_ptr<Pannable> _pannable;
192 virtual void distribute_one (AudioBuffer&, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which) = 0;
193 virtual void distribute_one_automated (AudioBuffer&, BufferSet& obufs,
194 framepos_t start, framepos_t end, pframes_t nframes,
195 pan_t** buffers, uint32_t which) = 0;
203 struct PanPluginDescriptor {
207 ARDOUR::Panner* (*factory)(boost::shared_ptr<ARDOUR::Pannable>, boost::shared_ptr<ARDOUR::Speakers>);
211 #endif /* __ardour_panner_h__ */