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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"
#include "sound/mp3.h"
#include "sound/vorbis.h"
namespace Sword1 {
WaveAudioStream *makeWaveStream(File *source, uint32 size) {
return new WaveAudioStream(source, size);
}
WaveAudioStream::WaveAudioStream(File *source, uint32 pSize) {
uint32 size;
uint8 wavHeader[WAVEHEADERSIZE];
_sourceFile = source;
_sourceFile->incRef();
if (_sourceFile->isOpen()) {
_sourceFile->read(wavHeader, WAVEHEADERSIZE);
_isStereo = (READ_LE_UINT16(wavHeader + 0x16) == 2);
_rate = READ_LE_UINT16(wavHeader + 0x18);
size = ((pSize) ? pSize : READ_LE_UINT32(wavHeader + 0x28));
assert(size <= (source->size() - source->pos()));
_bitsPerSample = READ_LE_UINT16(wavHeader + 0x22);
_samplesLeft = (size * 8) / _bitsPerSample;
if ((_bitsPerSample != 16) && (_bitsPerSample != 8))
error("WaveAudioStream: unknown wave type");
} else {
_samplesLeft = 0;
_isStereo = false;
_bitsPerSample = 16;
_rate = 22050;
}
}
WaveAudioStream::~WaveAudioStream(void) {
_sourceFile->decRef();
}
int WaveAudioStream::readBuffer(int16 *buffer, const int numSamples) {
int samples = ((int)_samplesLeft < numSamples) ? (int)_samplesLeft : numSamples;
if (_bitsPerSample == 16)
for (int cnt = 0; cnt < samples; cnt++)
*buffer++ = (int16)_sourceFile->readUint16LE();
else
for (int cnt = 0; cnt < samples; cnt++)
*buffer++ = (int16)_sourceFile->readByte() << 8;
_samplesLeft -= samples;
return samples;
}
bool WaveAudioStream::endOfData(void) const {
if (_samplesLeft == 0)
return true;
else
return false;
}
// 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.
AudioStream *MusicHandle::createAudioSource(void) {
_file.seek(0);
switch (_musicMode) {
#ifdef USE_MAD
case MusicMp3:
printf("creating mp3 stream\n");
return makeMP3Stream(&_file, _file.size());
#endif
#ifdef USE_VORBIS
case MusicVorbis:
return makeVorbisStream(&_file, _file.size());
#endif
case MusicWave:
return makeWaveStream(&_file, 0);
case MusicNone: // shouldn't happen
warning("createAudioSource ran into null create\n");
return NULL;
default:
error("MusicHandle::createAudioSource: called with illegal MusicMode");
}
return NULL; // never reached
}
bool MusicHandle::play(const char *fileBase, bool loop) {
char fileName[30];
stop();
_musicMode = MusicNone;
#ifdef USE_MAD
sprintf(fileName, "%s.mp3", fileBase);
if (_file.open(fileName))
_musicMode = MusicMp3;
#endif
#ifdef USE_VORBIS
if (!_file.isOpen()) { // mp3 doesn't exist (or not compiled with MAD support)
sprintf(fileName, "%s.ogg", fileBase);
if (_file.open(fileName))
_musicMode = MusicVorbis;
}
#endif
if (!_file.isOpen()) {
sprintf(fileName, "%s.wav", fileBase);
if (_file.open(fileName))
_musicMode = MusicWave;
else {
warning("Music file %s could not be opened", fileName);
return false;
}
}
_audioSource = createAudioSource();
_looping = loop;
fadeUp();
return true;
}
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();
}
// is we don't have an audiosource, return some dummy values.
// shouldn't happen anyways.
bool MusicHandle::streaming(void) const {
return (_audioSource) ? (!_audioSource->endOfStream()) : false;
}
bool MusicHandle::isStereo(void) const {
return (_audioSource) ? _audioSource->isStereo() : false;
}
int MusicHandle::getRate(void) const {
return (_audioSource) ? _audioSource->getRate() : 11025;
}
int MusicHandle::readBuffer(int16 *buffer, const int numSamples) {
int totalSamples = 0;
int16 *bufStart = buffer;
if (!_audioSource)
return 0;
int expectedSamples = numSamples;
while ((expectedSamples > 0) && _audioSource) { // _audioSource becomes NULL if we reach EOF and aren't looping
int samplesReturned = _audioSource->readBuffer(buffer, expectedSamples);
buffer += samplesReturned;
totalSamples += samplesReturned;
expectedSamples -= samplesReturned;
if ((expectedSamples > 0) && _audioSource->endOfData()) {
debug(2, "Music reached EOF");
_audioSource->endOfData();
if (_looping) {
delete _audioSource; // recreate same source.
_audioSource = createAudioSource();
}
if ((!_looping) || (!_audioSource))
stop();
}
}
// buffer was filled, now do the fading (if necessary)
int samplePos = 0;
while ((_fading > 0) && (samplePos < totalSamples)) { // fade down
bufStart[samplePos] = (bufStart[samplePos] * --_fading) / _fadeSamples;
samplePos++;
if (_fading == 0) {
stop();
// clear the rest of the buffer
memset(bufStart + samplePos, 0, (totalSamples - samplePos) * 2);
return samplePos;
}
}
while ((_fading < 0) && (samplePos < totalSamples)) { // fade up
bufStart[samplePos] = -(bufStart[samplePos] * --_fading) / _fadeSamples;
if (_fading <= -_fadeSamples)
_fading = 0;
}
return totalSamples;
}
void MusicHandle::stop() {
if (_audioSource) {
delete _audioSource;
_audioSource = NULL;
}
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;
}
if (_handles[newStream].play(_tuneList[tuneId], 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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