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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 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.
*
* $Header$
*
*/
// todo: add fadeout, crossfading.
// this code always loops. make it depend on _loopFlag
#include "stdafx.h"
#include "music.h"
#include "sound/mixer.h"
#include "common/util.h"
#include "common/file.h"
SwordMusic::SwordMusic(OSystem *system, SoundMixer *pMixer) {
_system = system;
_mixer = pMixer;
_mixer->setupPremix(passMixerFunc, this);
_fading = false;
_playing = false;
_loop = false;
_mutex = _system->create_mutex();
_fadeSmpInBuf = _fadeBufPos = _waveSize = _wavePos = _bufPos = _smpInBuf = 0;
assert(_mixer->getOutputRate() == 22050);
_fadeBuf = NULL;
_musicBuf = NULL;
}
SwordMusic::~SwordMusic() {
_mixer->setupPremix(0, 0);
}
void SwordMusic::passMixerFunc(void *param, int16 *buf, uint len) {
((SwordMusic*)param)->mixer(buf, len);
}
void SwordMusic::mixTo(int16 *src, int16 *dst, uint32 len) {
if (!_playing)
memset(dst, 0, len * 8);
if (!_fading) { // no fading, simply copy it over
for (uint32 cnt = 0; cnt < len; cnt++)
dst[(cnt << 2) | 0] = dst[(cnt << 2) | 1] =
dst[(cnt << 2) | 2] = dst[(cnt << 2) | 3] = (int16)READ_LE_UINT16(src + cnt);
} else {
if (_fadeBuf) { // do a cross fade
for (uint32 cnt = 0; cnt < len; cnt++) {
int16 resVal = ((int16)READ_LE_UINT16(_fadeBuf + _fadeBufPos) * _fadeVal) >> 15;
resVal += ((int16)READ_LE_UINT16(src + cnt) * (32768 - _fadeVal)) >> 15;
dst[(cnt << 2) | 0] = dst[(cnt << 2) | 1] =
dst[(cnt << 2) | 2] = dst[(cnt << 2) | 3] = resVal;
_fadeVal--;
_fadeBufPos++;
_fadeSmpInBuf--;
}
if ((!_fadeVal) || (!_fadeSmpInBuf)) {
free(_fadeBuf);
_fadeBuf = NULL;
_fading = false;
}
if (_fadeBufPos == BUFSIZE)
_fadeBufPos = 0;
} else { // simple fadeout
for (uint32 cnt = 0; cnt < len; cnt++) {
dst[(cnt << 2) | 0] = dst[(cnt << 2) | 1] =
dst[(cnt << 2) | 2] = dst[(cnt << 2) | 3] =
((int16)READ_LE_UINT16(src + cnt) * _fadeVal) >> 15;
_fadeVal--;
}
if ((!_fadeVal) || (!_smpInBuf)) {
_fading = _playing = false;
free(_musicBuf);
_musicBuf = NULL;
}
}
}
}
void SwordMusic::mixer(int16 *buf, uint32 len) {
if (!_playing) {
memset(buf, 0, 2 * len * sizeof(int16));
return;
}
uint32 remain = 0;
if (_smpInBuf < (len >> 1)) {
if (_loop)
return;
remain = (len >> 1) - _smpInBuf;
len = _smpInBuf << 1;
}
_system->lock_mutex(_mutex);
len >>= 1;
while (len) {
uint32 length = len;
length = MIN(length, BUFSIZE - _bufPos);
if (_fading && _fadeBuf) {
length = MIN(length, (uint32)_fadeVal);
length = MIN(length, _fadeSmpInBuf);
length = MIN(length, BUFSIZE - _fadeBufPos);
}
mixTo(_musicBuf + _bufPos, buf, length);
len -= length;
buf += 4 * length;
_bufPos += length;
_smpInBuf -= length;
if (_bufPos == BUFSIZE)
_bufPos = 0;
}
if (remain) {
memset(buf, 0, remain * 8);
_playing = false;
}
_system->unlock_mutex(_mutex);
}
void SwordMusic::stream(void) {
// make sure we've got enough samples in buffer.
if ((_smpInBuf < 4 * SAMPLERATE) && _playing && _musicFile.isOpen()) {
_system->lock_mutex(_mutex);
uint32 loadTotal = BUFSIZE - _smpInBuf;
while (uint32 doLoad = loadTotal) {
if (BUFSIZE - ((_bufPos + _smpInBuf) % BUFSIZE) < loadTotal)
doLoad = BUFSIZE - (_bufPos + _smpInBuf) % BUFSIZE;
doLoad = MIN(doLoad, _waveSize - _wavePos);
int16 *dest = _musicBuf + ((_bufPos + _smpInBuf) % BUFSIZE);
_musicFile.read(dest, doLoad * 2);
_wavePos += doLoad;
if (_wavePos == _waveSize) {
if (_loop) {
_wavePos = 0;
_musicFile.seek(WAVEHEADERSIZE);
} else
loadTotal = doLoad;
}
loadTotal -= doLoad;
_smpInBuf += doLoad;
}
_system->unlock_mutex(_mutex);
}
}
void SwordMusic::startMusic(int32 tuneId, int32 loopFlag) {
_system->lock_mutex(_mutex);
_loop = (loopFlag > 0);
if (tuneId) {
if (_musicFile.isOpen())
_musicFile.close();
char fName[20];
sprintf(fName, "music/%s.wav", _tuneList[tuneId]);
_musicFile.open(fName);
if (_musicFile.isOpen()) {
if (_playing) { // do a cross fade
_fadeBuf = _musicBuf;
_fadeBufPos = _bufPos;
_fadeSmpInBuf = _smpInBuf;
_fading = true;
_fadeVal = 32768;
} else
_fading = false;
_musicBuf = (int16*)malloc(BUFSIZE * 2);
_musicFile.seek(0x28);
_waveSize = _musicFile.readUint32LE() / 2;
_wavePos = 0;
_smpInBuf = 0;
_bufPos = 0;
_playing = true;
} else {
_fading = true;
_fadeVal = 32768;
if (_fadeBuf) {
free(_fadeBuf);
_fadeBuf = NULL;
}
}
} else {
if (_playing)
fadeDown();
if (_musicFile.isOpen())
_musicFile.close();
}
_system->unlock_mutex(_mutex);
stream();
}
void SwordMusic::fadeDown(void) {
_fadeVal = 32768;
_fading = true;
if (_fadeBuf) {
free(_fadeBuf);
_fadeBuf = NULL;
}
}
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