2 Copyright (C) 2004-2011 Paul Davis
3 adopted from 2in2out panner by Robin Gareus <robin@gareus.org>
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.
36 #include "pbd/cartesian.h"
37 #include "pbd/convert.h"
38 #include "pbd/error.h"
39 #include "pbd/failed_constructor.h"
40 #include "pbd/xml++.h"
41 #include "pbd/enumwriter.h"
43 #include "evoral/Curve.hpp"
45 #include "ardour/audio_buffer.h"
46 #include "ardour/audio_buffer.h"
47 #include "ardour/buffer_set.h"
48 #include "ardour/pan_controllable.h"
49 #include "ardour/pannable.h"
50 #include "ardour/runtime_functions.h"
51 #include "ardour/session.h"
52 #include "ardour/utils.h"
53 #include "ardour/mix.h"
55 #include "panner_balance.h"
59 #include "pbd/mathfix.h"
62 using namespace ARDOUR;
65 static PanPluginDescriptor _descriptor = {
67 "http://ardour.org/plugin/panner_balance",
68 "http://ardour.org/plugin/panner_balance#ui",
70 Pannerbalance::factory
73 extern "C" { PanPluginDescriptor* panner_descriptor () { return &_descriptor; } }
75 Pannerbalance::Pannerbalance (boost::shared_ptr<Pannable> p)
78 if (!_pannable->has_state()) {
79 _pannable->pan_azimuth_control->set_value (0.5);
85 pos_interp[0] = pos[0] = desired_pos[0];
87 pos_interp[1] = pos[1] = desired_pos[1];
89 _pannable->pan_azimuth_control->Changed.connect_same_thread (*this, boost::bind (&Pannerbalance::update, this));
92 Pannerbalance::~Pannerbalance ()
97 Pannerbalance::position () const
99 return _pannable->pan_azimuth_control->get_value();
103 Pannerbalance::set_position (double p)
105 if (clamp_position (p)) {
106 _pannable->pan_azimuth_control->set_value (p);
111 Pannerbalance::thaw ()
120 Pannerbalance::update ()
126 float const pos = _pannable->pan_azimuth_control->get_value();
129 desired_pos[0] = 1.0;
130 desired_pos[1] = 1.0;
131 } else if (pos > .5) {
132 desired_pos[0] = 2 - 2. * pos;
133 desired_pos[1] = 1.0;
135 desired_pos[0] = 1.0;
136 desired_pos[1] = 2. * pos;
141 Pannerbalance::clamp_position (double& p)
143 p = max (min (p, 1.0), 0.0);
148 Pannerbalance::position_range () const
150 return make_pair (0, 1);
154 Pannerbalance::distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which)
156 assert (obufs.count().n_audio() == 2);
162 Sample* const src = srcbuf.data();
164 dst = obufs.get_audio(which).data();
166 if (fabsf ((delta = (pos[which] - desired_pos[which]))) > 0.002) { // about 1 degree of arc
168 /* we've moving the pan by an appreciable amount, so we must
169 interpolate over 64 frames or nframes, whichever is smaller */
171 pframes_t const limit = min ((pframes_t) 64, nframes);
174 delta = -(delta / (float) (limit));
176 for (n = 0; n < limit; n++) {
177 pos_interp[which] = pos_interp[which] + delta;
178 pos[which] = pos_interp[which] + 0.9 * (pos[which] - pos_interp[which]);
179 dst[n] += src[n] * pos[which] * gain_coeff;
182 /* then pan the rest of the buffer; no need for interpolation for this bit */
184 pan = pos[which] * gain_coeff;
186 mix_buffers_with_gain (dst+n,src+n,nframes-n,pan);
190 pos[which] = desired_pos[which];
191 pos_interp[which] = pos[which];
193 if ((pan = (pos[which] * gain_coeff)) != 1.0f) {
197 /* pan is 1 but also not 0, so we must do it "properly" */
199 //obufs.get_audio(1).read_from (srcbuf, nframes);
200 mix_buffers_with_gain(dst,src,nframes,pan);
202 /* mark that we wrote into the buffer */
209 /* pan is 1 so we can just copy the input samples straight in */
210 mix_buffers_no_gain(dst,src,nframes);
216 Pannerbalance::distribute_one_automated (AudioBuffer& srcbuf, BufferSet& obufs,
217 framepos_t start, framepos_t end, pframes_t nframes,
218 pan_t** buffers, uint32_t which)
220 assert (obufs.count().n_audio() == 2);
224 Sample* const src = srcbuf.data();
225 pan_t* const position = buffers[0];
227 /* fetch positional data */
229 if (!_pannable->pan_azimuth_control->list()->curve().rt_safe_get_vector (start, end, position, nframes)) {
231 distribute_one (srcbuf, obufs, 1.0, nframes, which);
235 for (pframes_t n = 0; n < nframes; ++n) {
237 float const pos = position[n];
239 if (which == 0) { // Left
241 buffers[which][n] = 2 - 2. * pos;
243 buffers[which][n] = 1.0;
247 buffers[which][n] = 2. * pos;
249 buffers[which][n] = 1.0;
254 dst = obufs.get_audio(which).data();
255 pbuf = buffers[which];
257 for (pframes_t n = 0; n < nframes; ++n) {
258 dst[n] += src[n] * pbuf[n];
261 /* XXX it would be nice to mark the buffer as written to */
265 Pannerbalance::factory (boost::shared_ptr<Pannable> p, boost::shared_ptr<Speakers> /* ignored */)
267 return new Pannerbalance (p);
271 Pannerbalance::get_state ()
273 XMLNode& root (Panner::get_state ());
274 root.add_property (X_("uri"), _descriptor.panner_uri);
275 /* this is needed to allow new sessions to load with old Ardour: */
276 root.add_property (X_("type"), _descriptor.name);
280 std::set<Evoral::Parameter>
281 Pannerbalance::what_can_be_automated() const
283 set<Evoral::Parameter> s;
284 s.insert (Evoral::Parameter (PanAzimuthAutomation));
289 Pannerbalance::describe_parameter (Evoral::Parameter p)
292 case PanAzimuthAutomation:
295 return _pannable->describe_parameter (p);
300 Pannerbalance::value_as_string (boost::shared_ptr<AutomationControl> ac) const
302 /* DO NOT USE LocaleGuard HERE */
303 double val = ac->get_value();
305 switch (ac->parameter().type()) {
306 case PanAzimuthAutomation:
307 /* We show the position of the center of the image relative to the left & right.
308 This is expressed as a pair of percentage values that ranges from (100,0)
309 (hard left) through (50,50) (hard center) to (0,100) (hard right).
311 This is pretty wierd, but its the way audio engineers expect it. Just remember that
312 the center of the USA isn't Kansas, its (50LA, 50NY) and it will all make sense.
314 This is designed to be as narrow as possible. Dedicated
315 panner GUIs can do their own version of this if they need
316 something less compact.
319 return string_compose (_("L%1R%2"), (int) rint (100.0 * (1.0 - val)),
320 (int) rint (100.0 * val));
323 return _pannable->value_as_string (ac);
328 Pannerbalance::reset ()