khanat-opennel-code/code/nel/src/sound/music_channel_fader.cpp
2010-07-27 13:21:11 +02:00

216 lines
6 KiB
C++

// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "stdsound.h"
#include "nel/sound/music_channel_fader.h"
// Project includes
#include "nel/sound/driver/sound_driver.h"
#include "nel/sound/driver/music_channel.h"
using namespace std;
using namespace NLMISC;
namespace NLSOUND {
CMusicChannelFader::CMusicChannelFader() : _SoundDriver(NULL), _ActiveMusicFader(0), _Gain(1.0f), _LastTime(0)
{
}
CMusicChannelFader::~CMusicChannelFader()
{
}
void CMusicChannelFader::init(ISoundDriver *soundDriver)
{
nlassert(!_SoundDriver);
_SoundDriver = soundDriver;
_ActiveMusicFader = 0;
_Gain = 1.0f;
_LastTime = CTime::getLocalTime();
for (uint i = 0; i < _MaxMusicFader; ++i)
{
nlassert(!_MusicFader[i].MusicChannel);
_MusicFader[i].MusicChannel = _SoundDriver->createMusicChannel();
if (!_MusicFader[i].MusicChannel)
{
release();
nlwarning("No music channel available!");
return;
}
}
}
void CMusicChannelFader::release()
{
if (_SoundDriver)
{
for (uint i = 0; i < _MaxMusicFader; ++i) if (_MusicFader[i].MusicChannel)
{
delete _MusicFader[i].MusicChannel;
_MusicFader[i].MusicChannel = NULL;
}
_SoundDriver = NULL;
}
}
void CMusicChannelFader::update()
{
TTime current_time = CTime::getLocalTime();
float delta_time = (float)(current_time - _LastTime) / 1000.0f;
_LastTime = current_time;
for (uint i = 0; i < _MaxMusicFader; ++i)
{
_CMusicFader &fader = _MusicFader[i];
if (fader.Playing)
{
if (fader.MusicChannel->isEnded())
{
fader.MusicChannel->stop();
fader.Playing = false;
fader.Fade = false;
}
else if (fader.Fade)
{
// wait with fading in until the song has started playing (at 0 volume)
if (!fader.MusicChannel->isLoadingAsync())
{
fader.XFadeVolume += fader.XFadeDVolume * delta_time;
if (fader.XFadeVolume <= 0.f)
{
// fadeout complete
fader.MusicChannel->stop();
fader.Fade = false;
fader.Playing = false;
}
else if (fader.XFadeVolume >= 1.f)
{
// fadein complete
fader.Fade = false;
fader.XFadeVolume = 1.f;
}
}
}
}
}
updateVolume();
}
void CMusicChannelFader::updateVolume()
{
for (uint i = 0; i < _MaxMusicFader; ++i)
if (_MusicFader[i].Playing)
_MusicFader[i].MusicChannel->setVolume(_MusicFader[i].XFadeVolume * _Gain);
}
/** Play some music (.ogg etc...)
* NB: if an old music was played, it is first stop with stopMusic()
* \param filepath file path, CPath::lookup is done here
* \param async stream music from hard disk, preload in memory if false
* \param loop must be true to play the music in loop.
*/
bool CMusicChannelFader::play(const std::string &filepath, uint xFadeTime, bool async, bool loop)
{
stop(xFadeTime);
// Find the next best free music channel
uint nextFader = _MaxMusicFader;
for (uint i = 0; i < _MaxMusicFader; ++i) if (!_MusicFader[i].Playing)
{ nextFader = i; break; }
if (nextFader == _MaxMusicFader)
{
nextFader = (_ActiveMusicFader + 1) % _MaxMusicFader;
_MusicFader[nextFader].MusicChannel->stop();
_MusicFader[nextFader].Fade = false;
_MusicFader[nextFader].Playing = false;
}
_ActiveMusicFader = nextFader;
// Play a song in it :)
_CMusicFader &fader = _MusicFader[_ActiveMusicFader];
if (xFadeTime) fader.fadeIn(xFadeTime);
else fader.XFadeVolume = 1.0f;
fader.Playing = true;
updateVolume(); // make sure at ok volume to start :)
fader.Playing = fader.MusicChannel->play(filepath, async, loop);
return fader.Playing;
}
/// Stop the music previously loaded and played (the Memory is also freed)
void CMusicChannelFader::stop(uint xFadeTime)
{
if (xFadeTime)
{
for (uint i = 0; i < _MaxMusicFader; ++i) if (_MusicFader[i].Playing)
_MusicFader[i].fadeOut(xFadeTime);
}
else
{
for (uint i = 0; i < _MaxMusicFader; ++i) if (_MusicFader[i].Playing)
{
_MusicFader[i].MusicChannel->stop();
_MusicFader[i].Fade = false;
_MusicFader[i].Playing = false;
}
}
}
/// Pause the music previously loaded and played (the Memory is not freed)
void CMusicChannelFader::pause()
{
for (uint i = 0; i < _MaxMusicFader; ++i)
if (_MusicFader[i].Playing)
_MusicFader[i].MusicChannel->pause();
}
/// Resume the music previously paused
void CMusicChannelFader::resume()
{
for (uint i = 0; i < _MaxMusicFader; ++i)
if (_MusicFader[i].Playing)
_MusicFader[i].MusicChannel->resume();
}
/// Return true if all songs are finished.
bool CMusicChannelFader::isEnded()
{
for (uint i = 0; i < _MaxMusicFader; ++i)
{
if (_MusicFader[i].Playing) if (!_MusicFader[i].MusicChannel->isEnded())
return false; // at least one song still playing
}
return true; // no song found that is still playing
}
/// Return the total length (in second) of the music currently played
float CMusicChannelFader::getLength()
{
return _MusicFader[_ActiveMusicFader].MusicChannel->getLength();
}
/// Set the music volume (if any music played). (volume value inside [0 , 1]) (default: 1)
/// NB: the volume of music is NOT affected by IListener::setGain()
void CMusicChannelFader::setVolume(float gain)
{
_Gain = gain;
updateVolume();
}
} /* namespace NLSOUND */
/* end of file */