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livetrax/libs/panners/stereobalance/panner_balance.cc

308 lines
7.3 KiB
C++

/*
* Copyright (C) 2014-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2014-2017 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <inttypes.h>
#include <cerrno>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <float.h>
#include <locale.h>
#include <string>
#include <unistd.h>
#include <glibmm.h>
#include "pbd/cartesian.h"
#include "pbd/convert.h"
#include "pbd/enumwriter.h"
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "pbd/xml++.h"
#include "evoral/Curve.h"
#include "ardour/audio_buffer.h"
#include "ardour/buffer_set.h"
#include "ardour/mix.h"
#include "ardour/pan_controllable.h"
#include "ardour/pannable.h"
#include "ardour/runtime_functions.h"
#include "ardour/session.h"
#include "ardour/utils.h"
#include "panner_balance.h"
#include "pbd/i18n.h"
#include "pbd/mathfix.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
static PanPluginDescriptor _descriptor = {
"Stereo Balance",
"http://ardour.org/plugin/panner_balance",
"http://ardour.org/plugin/panner_balance#ui",
2, 2,
25,
Pannerbalance::factory
};
extern "C" ARDOURPANNER_API PanPluginDescriptor*
panner_descriptor ()
{
return &_descriptor;
}
Pannerbalance::Pannerbalance (boost::shared_ptr<Pannable> p)
: Panner (p)
{
if (!_pannable->has_state ()) {
_pannable->pan_azimuth_control->set_value (0.5, Controllable::NoGroup);
}
_can_automate_list.insert (Evoral::Parameter (PanAzimuthAutomation));
update ();
/* LEFT SIGNAL */
pos_interp[0] = pos[0] = desired_pos[0];
/* RIGHT SIGNAL */
pos_interp[1] = pos[1] = desired_pos[1];
_pannable->pan_azimuth_control->Changed.connect_same_thread (*this, boost::bind (&Pannerbalance::update, this));
}
Pannerbalance::~Pannerbalance ()
{
}
double
Pannerbalance::position () const
{
return _pannable->pan_azimuth_control->get_value ();
}
void
Pannerbalance::set_position (double p)
{
if (clamp_position (p)) {
_pannable->pan_azimuth_control->set_value (p, Controllable::NoGroup);
}
}
void
Pannerbalance::thaw ()
{
Panner::thaw ();
if (_frozen == 0) {
update ();
}
}
void
Pannerbalance::update ()
{
if (_frozen) {
return;
}
float const pos = _pannable->pan_azimuth_control->get_value ();
if (pos == .5) {
desired_pos[0] = 1.0;
desired_pos[1] = 1.0;
} else if (pos > .5) {
desired_pos[0] = 2 - 2. * pos;
desired_pos[1] = 1.0;
} else {
desired_pos[0] = 1.0;
desired_pos[1] = 2. * pos;
}
}
bool
Pannerbalance::clamp_position (double& p)
{
p = max (min (p, 1.0), 0.0);
return true;
}
pair<double, double>
Pannerbalance::position_range () const
{
return make_pair (0, 1);
}
void
Pannerbalance::distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which)
{
assert (obufs.count ().n_audio () == 2);
pan_t delta;
Sample* dst;
pan_t pan;
Sample* const src = srcbuf.data ();
dst = obufs.get_audio (which).data ();
if (fabsf ((delta = (pos[which] - desired_pos[which]))) > 0.002) { // about 1 degree of arc
/* we've moving the pan by an appreciable amount, so we must
* interpolate over 64 samples or nframes, whichever is smaller */
pframes_t const limit = min ((pframes_t)64, nframes);
pframes_t n;
delta = -(delta / (float)(limit));
for (n = 0; n < limit; n++) {
pos_interp[which] = pos_interp[which] + delta;
pos[which] = pos_interp[which] + 0.9 * (pos[which] - pos_interp[which]);
dst[n] += src[n] * pos[which] * gain_coeff;
}
/* then pan the rest of the buffer; no need for interpolation for this bit */
pan = pos[which] * gain_coeff;
mix_buffers_with_gain (dst + n, src + n, nframes - n, pan);
} else {
pos[which] = desired_pos[which];
pos_interp[which] = pos[which];
if ((pan = (pos[which] * gain_coeff)) != 1.0f) {
if (pan != 0.0f) {
/* pan is 1 but also not 0, so we must do it "properly" */
mix_buffers_with_gain (dst, src, nframes, pan);
/* XXX it would be nice to mark the buffer as written to */
}
} else {
/* pan is 1 so we can just copy the input samples straight in */
mix_buffers_no_gain (dst, src, nframes);
}
}
}
void
Pannerbalance::distribute_one_automated (AudioBuffer& srcbuf, BufferSet& obufs,
samplepos_t start, samplepos_t end, pframes_t nframes,
pan_t** buffers, uint32_t which)
{
assert (obufs.count ().n_audio () == 2);
Sample* dst;
pan_t* pbuf;
Sample* const src = srcbuf.data ();
pan_t* const position = buffers[0];
/* fetch positional data */
if (!_pannable->pan_azimuth_control->list ()->curve ().rt_safe_get_vector (timepos_t (start), timepos_t (end), position, nframes)) {
/* fallback */
distribute_one (srcbuf, obufs, 1.0, nframes, which);
return;
}
for (pframes_t n = 0; n < nframes; ++n) {
float const pos = position[n];
if (which == 0) { // Left
if (pos > .5) {
buffers[which][n] = 2 - 2. * pos;
} else {
buffers[which][n] = 1.0;
}
} else { // Right
if (pos < .5) {
buffers[which][n] = 2. * pos;
} else {
buffers[which][n] = 1.0;
}
}
}
dst = obufs.get_audio (which).data ();
pbuf = buffers[which];
for (pframes_t n = 0; n < nframes; ++n) {
dst[n] += src[n] * pbuf[n];
}
/* XXX it would be nice to mark the buffer as written to */
}
Panner*
Pannerbalance::factory (boost::shared_ptr<Pannable> p, boost::shared_ptr<Speakers> /* ignored */)
{
return new Pannerbalance (p);
}
XMLNode&
Pannerbalance::get_state ()
{
XMLNode& root (Panner::get_state ());
root.set_property (X_ ("uri"), _descriptor.panner_uri);
/* this is needed to allow new sessions to load with old Ardour: */
root.set_property (X_ ("type"), _descriptor.name);
return root;
}
string
Pannerbalance::value_as_string (boost::shared_ptr<const AutomationControl> ac) const
{
double val = ac->get_value ();
switch (ac->parameter ().type ()) {
case PanAzimuthAutomation:
/* We show the position of the center of the image relative to the left & right.
* This is expressed as a pair of percentage values that ranges from (100,0)
* (hard left) through (50,50) (hard center) to (0,100) (hard right).
*
* This is pretty wierd, but its the way audio engineers expect it. Just remember that
* the center of the USA isn't Kansas, its (50LA, 50NY) and it will all make sense.
*
* This is designed to be as narrow as possible. Dedicated
* panner GUIs can do their own version of this if they need
* something less compact.
*/
return string_compose (_ ("L%1R%2"), (int)rint (100.0 * (1.0 - val)),
(int)rint (100.0 * val));
default:
return _ ("unused");
}
}
void
Pannerbalance::reset ()
{
set_position (0.5);
update ();
}