Paul Davis
15b5fce904
git-svn-id: svn://localhost/ardour2/branches/3.0@8586 d708f5d6-7413-0410-9779-e7cbd77b26cf
476 lines
13 KiB
C++
476 lines
13 KiB
C++
/*
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Copyright (C) 2004-2011 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <inttypes.h>
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#include <cmath>
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#include <cerrno>
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#include <fstream>
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#include <cstdlib>
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#include <string>
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#include <cstdio>
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#include <locale.h>
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#include <unistd.h>
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#include <float.h>
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#include <iomanip>
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#include <glibmm.h>
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#include "pbd/cartesian.h"
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#include "pbd/convert.h"
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#include "pbd/error.h"
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#include "pbd/failed_constructor.h"
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#include "pbd/xml++.h"
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#include "pbd/enumwriter.h"
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#include "evoral/Curve.hpp"
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#include "ardour/audio_buffer.h"
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#include "ardour/audio_buffer.h"
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#include "ardour/buffer_set.h"
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#include "ardour/pan_controllable.h"
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#include "ardour/pannable.h"
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#include "ardour/runtime_functions.h"
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#include "ardour/session.h"
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#include "ardour/utils.h"
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#include "panner_2in2out.h"
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#include "i18n.h"
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#include "pbd/mathfix.h"
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using namespace std;
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using namespace ARDOUR;
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using namespace PBD;
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static PanPluginDescriptor _descriptor = {
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"Equal Power Stereo",
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2, 2,
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Panner2in2out::factory
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};
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extern "C" { PanPluginDescriptor* panner_descriptor () { return &_descriptor; } }
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Panner2in2out::Panner2in2out (boost::shared_ptr<Pannable> p)
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: Panner (p)
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{
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if (!_pannable->has_state()) {
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_pannable->pan_azimuth_control->set_value (0.5);
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_pannable->pan_width_control->set_value (1.0);
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}
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update ();
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/* LEFT SIGNAL */
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left_interp[0] = left[0] = desired_left[0];
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right_interp[0] = right[0] = desired_right[0];
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/* RIGHT SIGNAL */
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left_interp[1] = left[1] = desired_left[1];
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right_interp[1] = right[1] = desired_right[1];
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_pannable->pan_azimuth_control->Changed.connect_same_thread (*this, boost::bind (&Panner2in2out::update, this));
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_pannable->pan_width_control->Changed.connect_same_thread (*this, boost::bind (&Panner2in2out::update, this));
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}
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Panner2in2out::~Panner2in2out ()
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{
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}
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double
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Panner2in2out::position () const
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{
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return _pannable->pan_azimuth_control->get_value();
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}
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double
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Panner2in2out::width () const
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{
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return _pannable->pan_width_control->get_value();
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}
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void
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Panner2in2out::set_position (double p)
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{
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if (clamp_position (p)) {
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_pannable->pan_azimuth_control->set_value (p);
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}
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}
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void
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Panner2in2out::set_width (double p)
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{
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if (clamp_width (p)) {
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_pannable->pan_width_control->set_value (p);
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}
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}
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void
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Panner2in2out::update ()
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{
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/* it would be very nice to split this out into a virtual function
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that can be accessed from BaseStereoPanner and used in do_distribute_automated().
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but the place where its used in do_distribute_automated() is a tight inner loop,
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and making "nframes" virtual function calls to compute values is an absurd
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overhead.
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*/
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/* x == 0 => hard left = 180.0 degrees
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x == 1 => hard right = 0.0 degrees
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*/
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float pos[2];
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const double width = _pannable->pan_width_control->get_value();
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const double direction_as_lr_fract = _pannable->pan_azimuth_control->get_value();
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if (width < 0.0) {
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pos[0] = direction_as_lr_fract + (width/2.0); // left signal lr_fract
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pos[1] = direction_as_lr_fract - (width/2.0); // right signal lr_fract
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} else {
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pos[1] = direction_as_lr_fract + (width/2.0); // right signal lr_fract
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pos[0] = direction_as_lr_fract - (width/2.0); // left signal lr_fract
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}
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/* compute target gain coefficients for both input signals */
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float const pan_law_attenuation = -3.0f;
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float const scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
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float panR;
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float panL;
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/* left signal */
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panR = pos[0];
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panL = 1 - panR;
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desired_left[0] = panL * (scale * panL + 1.0f - scale);
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desired_right[0] = panR * (scale * panR + 1.0f - scale);
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/* right signal */
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panR = pos[1];
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panL = 1 - panR;
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desired_left[1] = panL * (scale * panL + 1.0f - scale);
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desired_right[1] = panR * (scale * panR + 1.0f - scale);
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}
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bool
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Panner2in2out::clamp_position (double& p)
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{
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double w = _pannable->pan_width_control->get_value();
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return clamp_stereo_pan (p, w);
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}
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bool
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Panner2in2out::clamp_width (double& w)
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{
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double p = _pannable->pan_azimuth_control->get_value();
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return clamp_stereo_pan (p, w);
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}
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bool
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Panner2in2out::clamp_stereo_pan (double& direction_as_lr_fract, double& width)
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{
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double r_pos;
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double l_pos;
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width = max (min (width, 1.0), -1.0);
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direction_as_lr_fract = max (min (direction_as_lr_fract, 1.0), 0.0);
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r_pos = direction_as_lr_fract + (width/2.0);
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l_pos = direction_as_lr_fract - (width/2.0);
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if (width < 0.0) {
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swap (r_pos, l_pos);
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}
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/* if the new left position is less than or equal to zero (hard left) and the left panner
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is already there, we're not moving the left signal.
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*/
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if (l_pos < 0.0) {
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return false;
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}
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/* if the new right position is less than or equal to 1.0 (hard right) and the right panner
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is already there, we're not moving the right signal.
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*/
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if (r_pos > 1.0) {
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return false;
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}
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return true;
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}
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void
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Panner2in2out::distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which)
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{
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assert (obufs.count().n_audio() == 2);
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pan_t delta;
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Sample* dst;
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pan_t pan;
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Sample* const src = srcbuf.data();
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/* LEFT OUTPUT */
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dst = obufs.get_audio(0).data();
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if (fabsf ((delta = (left[which] - desired_left[which]))) > 0.002) { // about 1 degree of arc
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/* we've moving the pan by an appreciable amount, so we must
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interpolate over 64 frames or nframes, whichever is smaller */
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pframes_t const limit = min ((pframes_t) 64, nframes);
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pframes_t n;
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delta = -(delta / (float) (limit));
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for (n = 0; n < limit; n++) {
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left_interp[which] = left_interp[which] + delta;
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left[which] = left_interp[which] + 0.9 * (left[which] - left_interp[which]);
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dst[n] += src[n] * left[which] * gain_coeff;
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}
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/* then pan the rest of the buffer; no need for interpolation for this bit */
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pan = left[which] * gain_coeff;
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mix_buffers_with_gain (dst+n,src+n,nframes-n,pan);
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} else {
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left[which] = desired_left[which];
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left_interp[which] = left[which];
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if ((pan = (left[which] * gain_coeff)) != 1.0f) {
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if (pan != 0.0f) {
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/* pan is 1 but also not 0, so we must do it "properly" */
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mix_buffers_with_gain(dst,src,nframes,pan);
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/* mark that we wrote into the buffer */
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// obufs[0] = 0;
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}
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} else {
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/* pan is 1 so we can just copy the input samples straight in */
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mix_buffers_no_gain(dst,src,nframes);
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/* XXX it would be nice to mark that we wrote into the buffer */
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}
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}
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/* RIGHT OUTPUT */
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dst = obufs.get_audio(1).data();
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if (fabsf ((delta = (right[which] - desired_right[which]))) > 0.002) { // about 1 degree of arc
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/* we're moving the pan by an appreciable amount, so we must
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interpolate over 64 frames or nframes, whichever is smaller */
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pframes_t const limit = min ((pframes_t) 64, nframes);
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pframes_t n;
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delta = -(delta / (float) (limit));
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for (n = 0; n < limit; n++) {
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right_interp[which] = right_interp[which] + delta;
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right[which] = right_interp[which] + 0.9 * (right[which] - right_interp[which]);
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dst[n] += src[n] * right[which] * gain_coeff;
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}
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/* then pan the rest of the buffer, no need for interpolation for this bit */
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pan = right[which] * gain_coeff;
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mix_buffers_with_gain(dst+n,src+n,nframes-n,pan);
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/* XXX it would be nice to mark the buffer as written to */
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} else {
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right[which] = desired_right[which];
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right_interp[which] = right[which];
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if ((pan = (right[which] * gain_coeff)) != 1.0f) {
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if (pan != 0.0f) {
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/* pan is not 1 but also not 0, so we must do it "properly" */
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mix_buffers_with_gain(dst,src,nframes,pan);
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/* XXX it would be nice to mark the buffer as written to */
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}
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} else {
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/* pan is 1 so we can just copy the input samples straight in */
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mix_buffers_no_gain(dst,src,nframes);
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/* XXX it would be nice to mark the buffer as written to */
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}
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}
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}
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void
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Panner2in2out::distribute_one_automated (AudioBuffer& srcbuf, BufferSet& obufs,
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framepos_t start, framepos_t end, pframes_t nframes,
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pan_t** buffers, uint32_t which)
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{
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assert (obufs.count().n_audio() == 2);
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Sample* dst;
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pan_t* pbuf;
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Sample* const src = srcbuf.data();
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pan_t* const position = buffers[0];
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pan_t* const width = buffers[1];
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/* fetch positional data */
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if (!_pannable->pan_azimuth_control->list()->curve().rt_safe_get_vector (start, end, position, nframes)) {
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/* fallback */
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distribute_one (srcbuf, obufs, 1.0, nframes, which);
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return;
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}
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if (!_pannable->pan_width_control->list()->curve().rt_safe_get_vector (start, end, width, nframes)) {
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/* fallback */
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distribute_one (srcbuf, obufs, 1.0, nframes, which);
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return;
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}
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/* apply pan law to convert positional data into pan coefficients for
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each buffer (output)
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*/
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const float pan_law_attenuation = -3.0f;
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const float scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
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for (pframes_t n = 0; n < nframes; ++n) {
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float panR;
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if (which == 0) {
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// panning left signal
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panR = position[n] - (width[n]/2.0f); // center - width/2
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} else {
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// panning right signal
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panR = position[n] + (width[n]/2.0f); // center - width/2
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}
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const float panL = 1 - panR;
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/* note that are overwriting buffers, but its OK
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because we're finished with their old contents
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(position/width automation data) and are
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replacing it with panning/gain coefficients
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that we need to actually process the data.
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*/
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buffers[0][n] = panL * (scale * panL + 1.0f - scale);
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buffers[1][n] = panR * (scale * panR + 1.0f - scale);
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}
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/* LEFT OUTPUT */
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dst = obufs.get_audio(0).data();
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pbuf = buffers[0];
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for (pframes_t n = 0; n < nframes; ++n) {
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dst[n] += src[n] * pbuf[n];
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}
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/* XXX it would be nice to mark the buffer as written to */
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/* RIGHT OUTPUT */
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dst = obufs.get_audio(1).data();
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pbuf = buffers[1];
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for (pframes_t n = 0; n < nframes; ++n) {
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dst[n] += src[n] * pbuf[n];
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}
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/* XXX it would be nice to mark the buffer as written to */
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}
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Panner*
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Panner2in2out::factory (boost::shared_ptr<Pannable> p, Speakers& /* ignored */)
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{
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return new Panner2in2out (p);
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}
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XMLNode&
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Panner2in2out::get_state (void)
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{
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return state (true);
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}
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XMLNode&
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Panner2in2out::state (bool /*full_state*/)
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{
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XMLNode& root (Panner::get_state ());
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root.add_property (X_("type"), _descriptor.name);
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return root;
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}
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int
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Panner2in2out::set_state (const XMLNode& node, int version)
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{
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LocaleGuard lg (X_("POSIX"));
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Panner::set_state (node, version);
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return 0;
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}
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std::set<Evoral::Parameter>
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Panner2in2out::what_can_be_automated() const
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{
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set<Evoral::Parameter> s;
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s.insert (Evoral::Parameter (PanAzimuthAutomation));
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s.insert (Evoral::Parameter (PanWidthAutomation));
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return s;
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}
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string
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Panner2in2out::describe_parameter (Evoral::Parameter p)
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{
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switch (p.type()) {
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case PanAzimuthAutomation:
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return _("L/R");
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case PanWidthAutomation:
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return _("Width");
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default:
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return _pannable->describe_parameter (p);
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}
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}
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