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/*
* Copyright (C) 2011-2012 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2011-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
* Copyright (C) 2014-2015 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 <cmath>
#include <cerrno>
#include <cstdlib>
#include <string>
#include <cstdio>
#include <locale.h>
#include <unistd.h>
#include <float.h>
#include <glibmm.h>
#include "pbd/cartesian.h"
#include "pbd/convert.h"
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "pbd/xml++.h"
#include "pbd/enumwriter.h"
#include "evoral/Curve.h"
#include "ardour/session.h"
#include "ardour/panner.h"
#include "ardour/utils.h"
#include "ardour/audio_buffer.h"
#include "ardour/debug.h"
#include "ardour/runtime_functions.h"
#include "ardour/buffer_set.h"
#include "ardour/audio_buffer.h"
#include "ardour/pannable.h"
#include "ardour/profile.h"
#include "pbd/i18n.h"
#include "panner_1in2out.h"
#include "pbd/mathfix.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
static PanPluginDescriptor _descriptor = {
"Mono to Stereo Panner",
"http://ardour.org/plugin/panner_1in2out",
"http://ardour.org/plugin/panner_1in2out#ui",
1, 2,
10000,
Panner1in2out::factory
};
extern "C" ARDOURPANNER_API PanPluginDescriptor* panner_descriptor () { return &_descriptor; }
Panner1in2out::Panner1in2out (boost::shared_ptr<Pannable> p)
: Panner (p)
{
if (!_pannable->has_state ()) {
_pannable->pan_azimuth_control->set_value (0.5, Controllable::NoGroup);
}
update ();
left = desired_left;
right = desired_right;
left_interp = left;
right_interp = right;
_pannable->pan_azimuth_control->Changed.connect_same_thread (*this, boost::bind (&Panner1in2out::update, this));
}
Panner1in2out::~Panner1in2out ()
{
}
void
Panner1in2out::update ()
{
float panR, panL;
float const pan_law_attenuation = -3.0f;
float const scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
panR = _pannable->pan_azimuth_control->get_value();
panL = 1 - panR;
desired_left = panL * (scale * panL + 1.0f - scale);
desired_right = panR * (scale * panR + 1.0f - scale);
}
void
Panner1in2out::set_position (double p)
{
if (clamp_position (p)) {
_pannable->pan_azimuth_control->set_value (p, Controllable::NoGroup);
}
}
bool
Panner1in2out::clamp_position (double& p)
{
/* any position between 0.0 and 1.0 is legal */
DEBUG_TRACE (DEBUG::Panning, string_compose ("want to move panner to %1 - always allowed in 0.0-1.0 range\n", p));
p = max (min (p, 1.0), 0.0);
return true;
}
pair<double, double>
Panner1in2out::position_range () const
{
return make_pair (0, 1);
}
double
Panner1in2out::position () const
{
return _pannable->pan_azimuth_control->get_value ();
}
void
Panner1in2out::distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t /* not used */)
{
assert (obufs.count().n_audio() == 2);
pan_t delta;
Sample* dst;
pan_t pan;
Sample* const src = srcbuf.data();
/* LEFT OUTPUT */
dst = obufs.get_audio(0).data();
if (fabsf ((delta = (left - desired_left))) > 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++) {
left_interp = left_interp + delta;
left = left_interp + 0.9 * (left - left_interp);
dst[n] += src[n] * left * gain_coeff;
}
/* then pan the rest of the buffer; no need for interpolation for this bit */
pan = left * gain_coeff;
mix_buffers_with_gain (dst+n,src+n,nframes-n,pan);
} else {
left = desired_left;
left_interp = left;
if ((pan = (left * 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);
/* mark that we wrote into the buffer */
// obufs[0] = 0;
}
} else {
/* pan is 1 so we can just copy the input samples straight in */
mix_buffers_no_gain(dst,src,nframes);
/* XXX it would be nice to mark that we wrote into the buffer */
}
}
/* RIGHT OUTPUT */
dst = obufs.get_audio(1).data();
if (fabsf ((delta = (right - desired_right))) > 0.002) { // about 1 degree of arc
/* we're 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++) {
right_interp = right_interp + delta;
right = right_interp + 0.9 * (right - right_interp);
dst[n] += src[n] * right * gain_coeff;
}
/* then pan the rest of the buffer, no need for interpolation for this bit */
pan = right * gain_coeff;
mix_buffers_with_gain(dst+n,src+n,nframes-n,pan);
/* XXX it would be nice to mark the buffer as written to */
} else {
right = desired_right;
right_interp = right;
if ((pan = (right * gain_coeff)) != 1.0f) {
if (pan != 0.0f) {
/* pan is not 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);
/* XXX it would be nice to mark the buffer as written to */
}
}
}
void
Panner1in2out::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 (start, end, position, nframes)) {
/* fallback */
distribute_one (srcbuf, obufs, 1.0, nframes, which);
return;
}
/* apply pan law to convert positional data into pan coefficients for
each buffer (output)
*/
const float pan_law_attenuation = -3.0f;
const float scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
for (pframes_t n = 0; n < nframes; ++n) {
float panR = position[n];
const float panL = 1 - panR;
/* note that are overwriting buffers, but its OK
because we're finished with their old contents
(position automation data) and are
replacing it with panning/gain coefficients
that we need to actually process the data.
*/
buffers[0][n] = panL * (scale * panL + 1.0f - scale);
buffers[1][n] = panR * (scale * panR + 1.0f - scale);
}
/* LEFT OUTPUT */
dst = obufs.get_audio(0).data();
pbuf = buffers[0];
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 */
/* RIGHT OUTPUT */
dst = obufs.get_audio(1).data();
pbuf = buffers[1];
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*
Panner1in2out::factory (boost::shared_ptr<Pannable> p, boost::shared_ptr<Speakers> /* ignored */)
{
return new Panner1in2out (p);
}
XMLNode&
Panner1in2out::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;
}
std::set<Evoral::Parameter>
Panner1in2out::what_can_be_automated() const
{
set<Evoral::Parameter> s;
s.insert (Evoral::Parameter (PanAzimuthAutomation));
return s;
}
string
Panner1in2out::describe_parameter (Evoral::Parameter p)
{
switch (p.type()) {
case PanAzimuthAutomation:
return _("L/R");
default:
return _pannable->describe_parameter (p);
}
}
string
Panner1in2out::value_as_string (boost::shared_ptr<const AutomationControl> ac) const
{
/* DO NOT USE LocaleGuard HERE */
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
Panner1in2out::reset ()
{
set_position (0.5);
update ();
}
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