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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "gob/sound/soundmixer.h"
#include "gob/sound/sounddesc.h"
#include "audio/decoders/raw.h"
namespace Gob {
SoundMixer::SoundMixer(Audio::Mixer &mixer, Audio::Mixer::SoundType type) : _mixer(&mixer) {
_playingSound = 0;
_rate = _mixer->getOutputRate();
_end = true;
_data = 0;
_length = 0;
_freq = 0;
_repCount = 0;
_offset = 0;
_offsetFrac = 0;
_offsetInc = 0;
_cur = 0;
_last = 0;
_fade = false;
_fadeVol = 65536;
_fadeVolStep = 0;
_fadeSamples = 0;
_curFadeSamples = 0;
_mixer->playStream(type, &_handle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
}
SoundMixer::~SoundMixer() {
_mixer->stopHandle(_handle);
}
inline int16 SoundMixer::getData(int offset) {
if (!_16bit)
return (int16) ((int8) _data[offset]);
else
return (int16) READ_LE_UINT16(_data + (offset * 2));
}
bool SoundMixer::isPlaying() const {
return !_end;
}
char SoundMixer::getPlayingSound() const {
return _playingSound;
}
void SoundMixer::stop(int16 fadeLength) {
Common::StackLock slock(_mutex);
if (fadeLength <= 0) {
_data = 0;
_end = true;
_playingSound = 0;
return;
}
_fade = true;
_fadeVol = 65536;
_fadeSamples = (int) (fadeLength * (((double) _rate) / 10.0));
_fadeVolStep = MAX((int32) 1, (int32) (65536 / _fadeSamples));
_curFadeSamples = 0;
}
void SoundMixer::setRepeating(int32 repCount) {
Common::StackLock slock(_mutex);
_repCount = repCount;
}
void SoundMixer::setSample(SoundDesc &sndDesc, int16 repCount, int16 frequency,
int16 fadeLength) {
if (frequency <= 0)
frequency = sndDesc._frequency;
sndDesc._repCount = repCount - 1;
sndDesc._frequency = frequency;
_16bit = (sndDesc._mixerFlags & Audio::FLAG_16BITS) != 0;
_data = sndDesc.getData();
_length = sndDesc.size();
_freq = frequency;
_repCount = repCount;
_end = false;
_playingSound = 1;
_offset = 0;
_offsetFrac = 0;
_offsetInc = (_freq << FRAC_BITS) / _rate;
_last = _cur;
_cur = getData(0);
_curFadeSamples = 0;
if (fadeLength == 0) {
_fade = false;
_fadeVol = 65536;
_fadeSamples = 0;
_fadeVolStep = 0;
} else {
_fade = true;
_fadeVol = 0;
_fadeSamples = (int) (fadeLength * (((double) _rate) / 10.0));
_fadeVolStep = - MAX((int32) 1, (int32) (65536 / _fadeSamples));
}
}
void SoundMixer::play(SoundDesc &sndDesc, int16 repCount, int16 frequency,
int16 fadeLength) {
Common::StackLock slock(_mutex);
if (!_end)
return;
setSample(sndDesc, repCount, frequency, fadeLength);
}
void SoundMixer::checkEndSample() {
if ((_repCount == -1) || (--_repCount > 0)) {
_offset = 0;
_offsetFrac = 0;
_end = false;
_playingSound = 1;
} else {
_end = true;
_playingSound = 0;
}
}
int SoundMixer::readBuffer(int16 *buffer, const int numSamples) {
Common::StackLock slock(_mutex);
for (int i = 0; i < numSamples; i++) {
if (!_data)
return i;
if (_end || (_offset >= _length))
checkEndSample();
if (_end)
return i;
// Linear interpolation. See sound/rate.cpp
int16 val = (_last + (((_cur - _last) * _offsetFrac +
FRAC_HALF) >> FRAC_BITS)) << (_16bit ? 0 : 8);
*buffer++ = (val * _fadeVol) >> 16;
_offsetFrac += _offsetInc;
// Was there an integral change?
if (fracToInt(_offsetFrac) > 0) {
_last = _cur;
_cur = getData(_offset);
_offset += fracToInt(_offsetFrac);
_offsetFrac &= FRAC_LO_MASK;
}
if (_fade) {
if (++_curFadeSamples >= _fadeSamples)
endFade();
else
_fadeVol -= _fadeVolStep;
if (_fadeVol < 0)
_fadeVol = 0;
}
}
return numSamples;
}
void SoundMixer::endFade() {
if (_fadeVolStep > 0) {
_data = 0;
_end = true;
_playingSound = 0;
} else {
_fadeVol = 65536;
_fade = false;
}
}
} // End of namespace Gob
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