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livetrax/libs/panners/2in2out/panner_2in2out.cc
Paul Davis 2a8629d11c tentative commit of new panners subtree 
git-svn-id: svn://localhost/ardour2/branches/3.0@8521 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-01-17 17:51:44 +00:00

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/*
Copyright (C) 2004-2011 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <inttypes.h>
#include <cmath>
#include <cerrno>
#include <fstream>
#include <cstdlib>
#include <string>
#include <cstdio>
#include <locale.h>
#include <unistd.h>
#include <float.h>
#include <iomanip>
#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.hpp"
#include "ardour/audio_buffer.h"
#include "ardour/audio_buffer.h"
#include "ardour/buffer_set.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_2in2out.h"
#include "i18n.h"
#include "pbd/mathfix.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
static PanPluginDescriptor _descriptor = {
"Equal Power Stereo",
2, 2,
Panner2in2out::factory
};
extern "C" { PanPluginDescriptor* panner_descriptor () { return &_descriptor; } }
Panner2in2out::Panner2in2out (boost::shared_ptr<Pannable> p)
: Panner (p)
{
_pannable->pan_azimuth_control->set_value (0.5);
_pannable->pan_width_control->set_value (1.0);
/* LEFT SIGNAL, panned hard left */
left[0] = 1.0;
right[0] = 0.0;
desired_left[0] = left_interp[0] = left[0];
desired_right[0] = right_interp[0] = right[0];
/* RIGHT SIGNAL, panned hard right */
left[1] = 0;
right[1] = 1.0;
desired_left[1] = left_interp[1] = left[1];
desired_right[1] = right_interp[1] = right[1];
_pannable->pan_azimuth_control->Changed.connect_same_thread (*this, boost::bind (&Panner2in2out::update, this));
_pannable->pan_width_control->Changed.connect_same_thread (*this, boost::bind (&Panner2in2out::update, this));
}
Panner2in2out::~Panner2in2out ()
{
}
double
Panner2in2out::position () const
{
return _pannable->pan_azimuth_control->get_value();
}
double
Panner2in2out::width () const
{
return _pannable->pan_width_control->get_value();
}
void
Panner2in2out::set_position (double p)
{
if (clamp_position (p)) {
_pannable->pan_azimuth_control->set_value (p);
}
}
void
Panner2in2out::set_width (double p)
{
if (clamp_width (p)) {
_pannable->pan_width_control->set_value (p);
}
}
void
Panner2in2out::update ()
{
/* it would be very nice to split this out into a virtual function
that can be accessed from BaseStereoPanner and used in do_distribute_automated().
but the place where its used in do_distribute_automated() is a tight inner loop,
and making "nframes" virtual function calls to compute values is an absurd
overhead.
*/
/* x == 0 => hard left = 180.0 degrees
x == 1 => hard right = 0.0 degrees
*/
float pos[2];
const double width = _pannable->pan_width_control->get_value();
const double direction_as_lr_fract = _pannable->pan_azimuth_control->get_value();
cerr << "new pan values width=" << width << " LR = " << direction_as_lr_fract << endl;
if (width < 0.0) {
pos[0] = direction_as_lr_fract + (width/2.0); // left signal lr_fract
pos[1] = direction_as_lr_fract - (width/2.0); // right signal lr_fract
} else {
pos[1] = direction_as_lr_fract + (width/2.0); // right signal lr_fract
pos[0] = direction_as_lr_fract - (width/2.0); // left signal lr_fract
}
/* compute target gain coefficients for both input signals */
float const pan_law_attenuation = -3.0f;
float const scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
float panR;
float panL;
/* left signal */
panR = pos[0];
panL = 1 - panR;
desired_left[0] = panL * (scale * panL + 1.0f - scale);
desired_right[0] = panR * (scale * panR + 1.0f - scale);
/* right signal */
panR = pos[1];
panL = 1 - panR;
desired_left[1] = panL * (scale * panL + 1.0f - scale);
desired_right[1] = panR * (scale * panR + 1.0f - scale);
}
bool
Panner2in2out::clamp_position (double& p)
{
double w = _pannable->pan_width_control->get_value();
return clamp_stereo_pan (p, w);
}
bool
Panner2in2out::clamp_width (double& w)
{
double p = _pannable->pan_azimuth_control->get_value();
return clamp_stereo_pan (p, w);
}
bool
Panner2in2out::clamp_stereo_pan (double& direction_as_lr_fract, double& width)
{
double r_pos = direction_as_lr_fract + (width/2.0);
double l_pos = direction_as_lr_fract - (width/2.0);
bool can_move_left = true;
bool can_move_right = true;
cerr << "Clamp pos = " << direction_as_lr_fract << " w = " << width << endl;
if (width > 1.0 || width < 1.0) {
return false;
}
if (direction_as_lr_fract > 1.0 || direction_as_lr_fract < 0.0) {
return false;
}
if (width < 0.0) {
swap (r_pos, l_pos);
}
/* if the new left position is less than or equal to zero (hard left) and the left panner
is already there, we're not moving the left signal.
*/
if (l_pos <= 0.0 && desired_left[0] <= 0.0) {
can_move_left = false;
}
/* if the new right position is less than or equal to 1.0 (hard right) and the right panner
is already there, we're not moving the right signal.
*/
if (r_pos >= 1.0 && desired_right[1] >= 1.0) {
can_move_right = false;
}
return can_move_left && can_move_right;
}
void
Panner2in2out::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();
/* LEFT OUTPUT */
dst = obufs.get_audio(0).data();
if (fabsf ((delta = (left[which] - desired_left[which]))) > 0.002) { // about 1 degree of arc
/* we've moving the pan by an appreciable amount, so we must
interpolate over 64 frames 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[which] = left_interp[which] + delta;
left[which] = left_interp[which] + 0.9 * (left[which] - left_interp[which]);
dst[n] += src[n] * left[which] * gain_coeff;
}
/* then pan the rest of the buffer; no need for interpolation for this bit */
pan = left[which] * gain_coeff;
mix_buffers_with_gain (dst+n,src+n,nframes-n,pan);
} else {
left[which] = desired_left[which];
left_interp[which] = left[which];
if ((pan = (left[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);
/* 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[which] - desired_right[which]))) > 0.002) { // about 1 degree of arc
/* we're moving the pan by an appreciable amount, so we must
interpolate over 64 frames 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[which] = right_interp[which] + delta;
right[which] = right_interp[which] + 0.9 * (right[which] - right_interp[which]);
dst[n] += src[n] * right[which] * gain_coeff;
}
/* then pan the rest of the buffer, no need for interpolation for this bit */
pan = right[which] * 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[which] = desired_right[which];
right_interp[which] = right[which];
if ((pan = (right[which] * 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
Panner2in2out::distribute_one_automated (AudioBuffer& srcbuf, BufferSet& obufs,
framepos_t start, framepos_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];
pan_t* const width = buffers[1];
/* 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;
}
if (!_pannable->pan_width_control->list()->curve().rt_safe_get_vector (start, end, width, 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;
if (which == 0) {
// panning left signal
panR = position[n] - (width[n]/2.0f); // center - width/2
} else {
// panning right signal
panR = position[n] + (width[n]/2.0f); // center - width/2
}
const float panL = 1 - panR;
/* note that are overwriting buffers, but its OK
because we're finished with their old contents
(position/width 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*
Panner2in2out::factory (boost::shared_ptr<Pannable> p, Speakers& /* ignored */)
{
return new Panner2in2out (p);
}
XMLNode&
Panner2in2out::get_state (void)
{
return state (true);
}
XMLNode&
Panner2in2out::state (bool /*full_state*/)
{
XMLNode& root (Panner::get_state ());
root.add_property (X_("type"), _descriptor.name);
return root;
}
int
Panner2in2out::set_state (const XMLNode& node, int version)
{
LocaleGuard lg (X_("POSIX"));
Panner::set_state (node, version);
return 0;
}
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