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flightgear/src/Sound/fg_sound.cxx

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// fg_sound.hxx -- Sound class implementation
//
// Started by Erik Hofman, February 2002
// (Reuses some code from fg_fx.cxx created by David Megginson)
//
// Copyright (C) 2002 Curtis L. Olson - curt@flightgear.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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
#include <simgear/compiler.h>
#ifdef SG_HAVE_STD_INCLUDES
# include <cmath>
#else
# include <math.h>
#endif
#include STL_STRING
#include <simgear/debug/logstream.hxx>
#include <Main/fg_props.hxx>
#include "fg_sound.hxx"
SG_USING_STD(string);
// static double _fg_lin(double v) { return v; };
static double _fg_inv(double v) { return (v == 0) ? 1e99 : 1/v; };
static double _fg_abs(double v) { return (v >= 0) ? v : -v; };
static double _fg_sqrt(double v) { return (v < 0) ? sqrt(-v) : sqrt(v); };
static double _fg_log10(double v) { return (v < 1) ? 0 : log10(v+1); };
static double _fg_log(double v) { return (v < 1) ? 0 : log(v+1); };
// static double _fg_sqr(double v) { return pow(v, 2); };
// static double _fg_pow3(double v) { return pow(v, 3); };
static const struct {
string name;
double (*fn)(double);
} __fg_snd_fn[] = {
// {"lin", _fg_lin},
{"inv", _fg_inv},
{"abs", _fg_abs},
{"sqrt", _fg_sqrt},
{"log", _fg_log10},
{"ln", _fg_log},
// {"sqr", _fg_sqr},
// {"pow3", _fg_pow3},
{"", NULL}
};
FGSound::FGSound(const SGPropertyNode * node)
: _node(node),
_sample(NULL),
_active(false),
_mode(FGSound::ONCE),
_type(FGSound::LEVEL),
_name(""),
_factor(1.0)
{
}
FGSound::~FGSound()
{
delete _sample;
}
void
FGSound::init()
{
_property = fgGetNode(_node->getStringValue("property"), true);
//
// seet sound global properties
//
_name = _node->getStringValue("name");
if ((_factor = _node->getFloatValue("factor")) == 0.0)
_factor = 1.0;
if ((_offset = _node->getFloatValue("offset")) == 0.0)
_offset = 0.0;
SG_LOG(SG_GENERAL, SG_INFO,
"Loading sound information for: " << _name );
if (_node->getStringValue("mode") == "looped") {
_mode = FGSound::LOOPED;
} else {
_mode = FGSound::ONCE;
if (_node->getStringValue("mode") != (string)"once")
SG_LOG( SG_GENERAL, SG_INFO, "Unknown sound mode, default to 'once'");
}
if (_node->getStringValue("type") == "flipflop") {
_type = FGSound::FLIPFLOP;
} else if (_node->getStringValue("type") == "inverted") {
_type = FGSound::INVERTED;
} else if (_node->getStringValue("type") == "raise") {
_type = FGSound::RAISE;
} else if (_node->getStringValue("type") == "fall") {
_type = FGSound::FALL;
} else {
_type = FGSound::LEVEL;
if (_node->getStringValue("type") != (string)"level")
SG_LOG( SG_GENERAL, SG_INFO, "Unknown sound type, default to 'level'");
}
#if 0
//
// set position properties
//
_pos.dist = _node->getFloatValue("dist");
_pos.hor = _node->getFloatValue("pos_hor");
_pos.vert = _node->getFloatValue("pos_vert");
#endif
//
// set volume properties
//
unsigned int i;
float v = 0.0;
vector<const SGPropertyNode *> kids = _node->getChildren("volume");
for (i = 0; (i < kids.size()) && (i < FGSound::MAXPROP); i++) {
_snd_prop volume;
if ((volume.prop=fgGetNode(kids[i]->getStringValue("property"), true))
== 0)
volume.prop = fgGetNode("/null", true);
if ((volume.factor = kids[i]->getFloatValue("factor")) == 0.0)
volume.factor = 1.0;
else
if (volume.factor < 0.0) {
volume.factor = -volume.factor;
volume.subtract = true;
} else
volume.subtract = false;
volume.fn = NULL;
for (int j=0; __fg_snd_fn[j].fn; j++)
if (__fg_snd_fn[j].name == kids[i]->getStringValue("type")) {
volume.fn = __fg_snd_fn[j].fn;
break;
}
if (!volume.fn)
SG_LOG( SG_GENERAL, SG_INFO, "Unknown volume type, default to 'lin'");
if ((volume.offset = kids[i]->getFloatValue("offset")) == 0.0)
volume.offset = 0.0;
if ((volume.min = kids[i]->getFloatValue("min")) < 0.0) {
SG_LOG( SG_GENERAL, SG_WARN,
"Volume minimum value below 0. Forced to 0.");
volume.min = 0.0;
}
if ((volume.max = kids[i]->getFloatValue("max")) <= volume.min) {
SG_LOG( SG_GENERAL, SG_ALERT,
"Volume maximum value below minimum value. Forced above minimum.");
volume.max = volume.min + 5.0;
}
_volume.push_back(volume);
v += volume.offset;
}
//
// set pitch properties
//
float p = 0.0;
kids = _node->getChildren("pitch");
for (i = 0; (i < kids.size()) && (i < FGSound::MAXPROP); i++) {
_snd_prop pitch;
if ((pitch.prop = fgGetNode(kids[i]->getStringValue("property"), true))
== 0)
pitch.prop = fgGetNode("/null", true);
if ((pitch.factor = kids[i]->getFloatValue("factor")) == 0.0)
pitch.factor = 1.0;
pitch.fn = NULL;
for (int j=0; __fg_snd_fn[j].fn; j++)
if(__fg_snd_fn[j].name == kids[i]->getStringValue("type")) {
pitch.fn = __fg_snd_fn[j].fn;
break;
}
if (!pitch.fn)
SG_LOG( SG_GENERAL, SG_INFO, "Unknown pitch type, default to 'lin'");
if ((pitch.offset = kids[i]->getFloatValue("offset")) == 0.0)
pitch.offset = 1.0;
if ((pitch.min = kids[i]->getFloatValue("min")) < 0.0) {
SG_LOG( SG_GENERAL, SG_WARN,
"Pitch minimum value below 0. Forced to 0.");
pitch.min = 0.0;
}
if ((pitch.max = kids[i]->getFloatValue("max")) <= pitch.min) {
SG_LOG( SG_GENERAL, SG_ALERT,
"Pitch maximum value below minimum value. Forced above minimum.");
pitch.max = pitch.min + 5.0;
}
_pitch.push_back(pitch);
p += pitch.offset;
}
//
// Initialize the sample
//
FGSoundMgr * mgr = globals->get_soundmgr();
if (mgr->find(_name) == NULL) {
_sample = mgr->add(_name, _node->getStringValue("path"));
_sample->set_volume(v);
_sample->set_pitch(p);
} else {
_sample = mgr->find(_name);
_sample->set_volume(_sample->get_volume() + v);
_sample->set_pitch(_sample->get_pitch() + p);
}
}
void
FGSound::bind ()
{
}
void
FGSound::unbind ()
{
}
void
FGSound::update (int dt)
{
FGSoundMgr * mgr = globals->get_soundmgr();
//
// Do we have something to do?
//
// if (!_property)
// return;
if ((_type == FGSound::LEVEL) || (_type == FGSound::INVERTED)) {
int check = (_offset + _property->getFloatValue() * _factor);
if (_type == FGSound::INVERTED)
check = !check;
//
// If the state changes to false, stop playing.
//
if (check == 0) {
_active = false;
if (mgr->is_playing(_name)) {
SG_LOG(SG_GENERAL, SG_INFO, "Stopping sound: " << _name);
mgr->stop(_name);
}
return;
}
//
// If the sound is already playing we have nothing to do.
//
if (_active && (_mode == FGSound::ONCE))
return;
} else { // FLIPFLOP, RAISE, FALL
int check = (_offset + _property->getFloatValue() * _factor);
if ((bool)check == _active)
return;
//
// Check for state changes.
// If the state changed, and the sound is still playing: stop playing.
//
if (mgr->is_playing(_name)) {
SG_LOG(SG_GENERAL, SG_INFO, "Stopping sound: " << _name);
mgr->stop(_name);
}
if ( ((_type == FGSound::RAISE) && !check) ||
((_type == FGSound::FALL) && check) )
return;
}
//
// Update the volume
//
int max = _volume.size();
int i;
double volume = 1.0, volume_offset = 0.0;
for(i = 0; i < max; i++) {
double v = _volume[i].prop->getDoubleValue();
if (_volume[i].fn)
v = _volume[i].fn(v);
v *= _volume[i].factor;
if (v > _volume[i].max)
v = _volume[i].max;
else
if (v < _volume[i].min)
v = 0; // v = _volume[i].min;
if (_volume[i].subtract) // Hack!
volume = _volume[i].offset - v;
else {
volume_offset += _volume[i].offset;
volume *= v;
}
}
//
// Update the pitch
//
max = _pitch.size();
double pitch = 1.0, pitch_offset = 0.0;
for(i = 0; i < max; i++) {
double p = _pitch[i].prop->getDoubleValue();
if (_pitch[i].fn)
p = _pitch[i].fn(p);
p *= _pitch[i].factor;
if (p > _pitch[i].max)
p = _pitch[i].max;
else
if (p < _pitch[i].min)
p = _pitch[i].min;
if (_pitch[i].subtract) // Hack!
pitch = _pitch[i].offset - p;
else {
pitch_offset += _pitch[i].offset;
pitch *= p;
}
}
//
// Change sample state
//
_sample->set_pitch( pitch_offset + pitch );
_sample->set_volume( volume_offset + volume );
//
// Do we need to start playing the sample?
//
if (_active && ((_type == FGSound::LEVEL) || (_type == FGSound::INVERTED)))
return;
//
// This is needed for FGSound::FLIPFLOP and it works for
// FGSound::LEVEl. Doing it this way saves an extra 'if'.
//
_active = !_active;
if (_mode == FGSound::ONCE)
mgr->play_once(_name);
else
mgr->play_looped(_name);
SG_LOG(SG_GENERAL, SG_INFO, "Starting audio playback for: " << _name);
SG_LOG(SG_GENERAL, SG_BULK,
"Playing " << ((_mode == ONCE) ? "once" : "looped"));
SG_LOG(SG_GENERAL, SG_BULK, "Initial volume: " << volume_offset);
SG_LOG(SG_GENERAL, SG_BULK, "Initial pitch: " << pitch_offset);
}
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