mirror of
https://github.com/libretro/scummvm.git
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132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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// todo: add fadeout, crossfading.
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// this code always loops. make it depend on _loopFlag
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#include "stdafx.h"
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#include "music.h"
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#include "sound/mixer.h"
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#include "common/util.h"
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#include "common/file.h"
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SwordMusic::SwordMusic(OSystem *system, SoundMixer *pMixer) {
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_system = system;
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_mixer = pMixer;
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_mixer->setupPremix(passMixerFunc, this);
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_fading = 0;
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_playing = false;
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_loop = false;
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_mutex = _system->create_mutex();
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_waveSize = _wavePos = _bufPos = _smpInBuf = 0;
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assert(_mixer->getOutputRate() == 22050);
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}
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SwordMusic::~SwordMusic() {
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_mixer->setupPremix(0, 0);
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}
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void SwordMusic::passMixerFunc(void *param, int16 *buf, uint len) {
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((SwordMusic*)param)->mixer(buf, len);
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}
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void SwordMusic::mixer(int16 *buf, uint len) {
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if (!_playing)
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memset(buf, 0, 2 * len * sizeof(int16));
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else {
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_system->lock_mutex(_mutex);
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len >>= 1;
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if (len <= _smpInBuf) {
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uint32 maxLen = BUFSIZE - _bufPos;
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if (len >= maxLen) {
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for (uint32 cnt = 0; cnt < maxLen; cnt++)
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buf[(cnt << 2) | 0] = buf[(cnt << 2) | 1] =
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buf[(cnt << 2) | 2] = buf[(cnt << 2) | 3] = (int16)READ_LE_UINT16(_musicBuf + _bufPos + cnt);
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_smpInBuf -= maxLen;
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_bufPos = 0;
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len -= maxLen;
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buf += maxLen * 4;
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}
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if (len) {
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for (uint32 cnt = 0; cnt < len; cnt++)
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buf[(cnt << 2) | 0] = buf[(cnt << 2) | 1] =
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buf[(cnt << 2) | 2] = buf[(cnt << 2) | 3] = (int16)READ_LE_UINT16(_musicBuf + _bufPos + cnt);
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_smpInBuf -= len;
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_bufPos += len;
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}
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}
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_system->unlock_mutex(_mutex);
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}
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}
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void SwordMusic::stream(void) {
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// make sure we've got enough samples in buffer.
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if ((_smpInBuf < SAMPLERATE) && _playing) {
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_system->lock_mutex(_mutex);
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uint32 loadTotal = BUFSIZE - _smpInBuf;
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while (uint32 doLoad = loadTotal) {
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if (BUFSIZE - ((_bufPos + _smpInBuf) % BUFSIZE) < loadTotal)
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doLoad = BUFSIZE - (_bufPos + _smpInBuf) % BUFSIZE;
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if (_waveSize - _wavePos < doLoad)
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doLoad = _waveSize - _wavePos;
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int16 *dest = _musicBuf + ((_bufPos + _smpInBuf) % BUFSIZE);
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_musicFile.read(dest, doLoad * 2);
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_wavePos += doLoad;
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if (_wavePos == _waveSize) {
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_wavePos = 0;
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_musicFile.seek(WAVEHEADERSIZE);
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}
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loadTotal -= doLoad;
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_smpInBuf += doLoad;
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}
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_system->unlock_mutex(_mutex);
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}
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}
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void SwordMusic::startMusic(int32 tuneId, int32 loopFlag) {
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_system->lock_mutex(_mutex);
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_loop = (loopFlag > 0);
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if (tuneId) {
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if (_musicFile.isOpen())
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_musicFile.close();
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char fName[20];
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sprintf(fName, "music/%s.wav", _tuneList[tuneId]);
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_musicFile.open(fName);
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if (_musicFile.isOpen()) {
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_musicFile.seek(0x28);
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_waveSize = _musicFile.readUint32LE() / 2;
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_wavePos = 0;
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_smpInBuf = 0;
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_bufPos = 0;
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_playing = true;
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} else
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_playing = false;
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} else
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_playing = false;
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_system->unlock_mutex(_mutex);
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stream();
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}
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void SwordMusic::fadeDown(void) {
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warning("stub: SwordMusic::fadeDown");
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}
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