ardour/livetrax
13
0
Fork 0
Code
1c3f709bf7
livetrax/libs/panners/2in2out/panner_2in2out.cc
Paul Davis 466cc57416 why use fabs? 
git-svn-id: svn://localhost/ardour2/branches/3.0@8747 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-02-07 17:34:19 +00:00

504 lines
14 KiB
C++
Raw Blame History

/*
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)
{
if (!_pannable->has_state()) {
_pannable->pan_azimuth_control->set_value (0.5);
_pannable->pan_width_control->set_value (1.0);
}
update ();
/* LEFT SIGNAL */
left_interp[0] = left[0] = desired_left[0];
right_interp[0] = right[0] = desired_right[0];
/* RIGHT SIGNAL */
left_interp[1] = left[1] = desired_left[1];
right_interp[1] = right[1] = desired_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];
double width = _pannable->pan_width_control->get_value();
const double direction_as_lr_fract = _pannable->pan_azimuth_control->get_value();
if (width < 0.0) {
width = -width;
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;
double l_pos;
width = max (min (width, 1.0), -1.0);
direction_as_lr_fract = max (min (direction_as_lr_fract, 1.0), 0.0);
r_pos = direction_as_lr_fract + (width/2.0);
l_pos = direction_as_lr_fract - (width/2.0);
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) {
return 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) {
return false;
}
return true;
}
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;
}
std::set<Evoral::Parameter>
Panner2in2out::what_can_be_automated() const
{
set<Evoral::Parameter> s;
s.insert (Evoral::Parameter (PanAzimuthAutomation));
s.insert (Evoral::Parameter (PanWidthAutomation));
return s;
}
string
Panner2in2out::describe_parameter (Evoral::Parameter p)
{
switch (p.type()) {
case PanAzimuthAutomation:
return _("L/R");
case PanWidthAutomation:
return _("Width");
default:
return _pannable->describe_parameter (p);
}
}
string
Panner2in2out::value_as_string (boost::shared_ptr<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.
*/
return string_compose (_("L:%1 R:%2"), (int) rint (100.0 * (1.0 - val)),
(int) rint (100.0 * val));
case PanWidthAutomation:
return string_compose (_("Width: %1%%"), (int) floor (100.0 * val));
default:
return _pannable->value_as_string (ac);
}
}
View Git Blame Copy Permalink