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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003-2004 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "stdafx.h"
#include "music.h"
#include "sound/mixer.h"
#include "common/util.h"
#include "common/file.h"
namespace Sword1 {
// This means fading takes 3 seconds.
#define FADE_LENGTH 3
// These functions are only called from Music, so I'm just going to
// assume that if locking is needed it has already been taken care of.
void MusicHandle::fadeDown() {
if (streaming()) {
if (_fading < 0)
_fading = -_fading;
else if (_fading == 0)
_fading = FADE_LENGTH * getRate();
_fadeSamples = FADE_LENGTH * getRate();
}
}
void MusicHandle::fadeUp() {
if (streaming()) {
if (_fading > 0)
_fading = -_fading;
else if (_fading == 0)
_fading = -1;
_fadeSamples = FADE_LENGTH * getRate();
}
}
bool MusicHandle::endOfData() const {
return !streaming();
}
int MusicHandle::readBuffer(int16 *buffer, const int numSamples) {
int samples;
for (samples = 0; samples < numSamples && !endOfData(); samples++) {
int16 sample = _file.readUint16LE();
if (_file.ioFailed()) {
if (!_looping) {
stop();
sample = 0;
} else {
_file.clearIOFailed();
_file.seek(WAVEHEADERSIZE);
sample = _file.readUint16LE();
}
}
if (_fading > 0) {
if (--_fading == 0) {
_looping = false;
_file.close();
}
sample = (sample * _fading) / _fadeSamples;
} else if (_fading < 0) {
_fading--;
sample = -(sample * _fading) / _fadeSamples;
if (_fading <= -_fadeSamples)
_fading = 0;
}
*buffer++ = sample;
}
return samples;
}
bool MusicHandle::play(const char *filename, bool loop) {
uint8 wavHeader[WAVEHEADERSIZE];
stop();
if (!_file.open(filename)) {
warning("Music file %s could not be opened", filename);
return false;
}
_file.read(wavHeader, WAVEHEADERSIZE);
_stereo = (READ_LE_UINT16(wavHeader + 0x16) == 2);
_rate = READ_LE_UINT16(wavHeader + 0x18);
_looping = loop;
fadeUp();
return true;
}
void MusicHandle::stop() {
if (_file.isOpen())
_file.close();
_fading = 0;
_looping = false;
}
Music::Music(OSystem *system, SoundMixer *pMixer) {
_system = system;
_mixer = pMixer;
_mixer->setupPremix(passMixerFunc, this);
_mutex = _system->createMutex();
_converter[0] = NULL;
_converter[1] = NULL;
_volumeL = _volumeR = 192;
}
Music::~Music() {
_mixer->setupPremix(0, 0);
delete _converter[0];
delete _converter[1];
if (_mutex)
_system->deleteMutex(_mutex);
}
void Music::passMixerFunc(void *param, int16 *buf, uint len) {
((Music*)param)->mixer(buf, len);
}
void Music::mixer(int16 *buf, uint32 len) {
Common::StackLock lock(_mutex);
for (int i = 0; i < ARRAYSIZE(_handles); i++)
if (_handles[i].streaming() && _converter[i])
_converter[i]->flow(_handles[i], buf, len, _volumeL, _volumeR);
}
void Music::setVolume(uint8 volL, uint8 volR) {
_volumeL = (st_volume_t)volL;
_volumeR = (st_volume_t)volR;
}
void Music::giveVolume(uint8 *volL, uint8 *volR) {
*volL = (uint8)_volumeL;
*volR = (uint8)_volumeR;
}
void Music::startMusic(int32 tuneId, int32 loopFlag) {
Common::StackLock lock(_mutex);
if (strlen(_tuneList[tuneId]) > 0) {
int newStream = 0;
if (_handles[0].streaming() && _handles[1].streaming()) {
int streamToStop;
// Both streams playing - one must be forced to stop.
if (!_handles[0].fading() && !_handles[1].fading()) {
// None of them are fading. Shouldn't happen,
// so it doesn't matter which one we pick.
streamToStop = 0;
} else if (_handles[0].fading() && !_handles[1].fading()) {
// Stream 0 is fading, so pick that one.
streamToStop = 0;
} else if (!_handles[0].fading() && _handles[1].fading()) {
// Stream 1 is fading, so pick that one.
streamToStop = 1;
} else {
// Both streams are fading. Pick the one that
// is closest to silent.
if (ABS(_handles[0].fading()) < ABS(_handles[1].fading()))
streamToStop = 0;
else
streamToStop = 1;
}
_handles[streamToStop].stop();
}
if (_handles[0].streaming()) {
_handles[0].fadeDown();
newStream = 1;
} else if (_handles[1].streaming()) {
_handles[1].fadeDown();
newStream = 0;
}
char fName[20];
sprintf(fName, "%s.wav", _tuneList[tuneId]);
if (_handles[newStream].play(fName, loopFlag != 0)) {
delete _converter[newStream];
_converter[newStream] = makeRateConverter(_handles[newStream].getRate(), _mixer->getOutputRate(), _handles[newStream].isStereo(), false);
}
} else {
if (_handles[0].streaming())
_handles[0].fadeDown();
if (_handles[1].streaming())
_handles[1].fadeDown();
}
}
void Music::fadeDown() {
Common::StackLock lock(_mutex);
for (int i = 0; i < ARRAYSIZE(_handles); i++)
if (_handles[i].streaming())
_handles[i].fadeDown();
}
} // End of namespace Sword1
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