diff options
Diffstat (limited to 'engines/scumm/player_mod.cpp')
| -rw-r--r-- | engines/scumm/player_mod.cpp | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/engines/scumm/player_mod.cpp b/engines/scumm/player_mod.cpp new file mode 100644 index 0000000000..773d34732d --- /dev/null +++ b/engines/scumm/player_mod.cpp @@ -0,0 +1,181 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2001 Ludvig Strigeus + * Copyright (C) 2001-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + * + */ + +#include "common/stdafx.h" +#include "scumm/player_mod.h" +#include "sound/mixer.h" +#include "sound/rate.h" + +namespace Scumm { + +Player_MOD::Player_MOD(ScummEngine *scumm) { + int i; + _mixer = scumm->_mixer; + _samplerate = _mixer->getOutputRate(); + _mixamt = 0; + _mixpos = 0; + + for (i = 0; i < MOD_MAXCHANS; i++) { + _channels[i].id = 0; + _channels[i].vol = 0; + _channels[i].freq = 0; + _channels[i].converter = NULL; + _channels[i].input = NULL; + } + + _playproc = NULL; + _playparam = NULL; + + _mixer->setupPremix(this); +} + +Player_MOD::~Player_MOD() { + // Detach the premix callback handler + _mixer->setupPremix(0); + for (int i = 0; i < MOD_MAXCHANS; i++) { + if (!_channels[i].id) + continue; + delete _channels[i].converter; + delete _channels[i].input; + } +} + +void Player_MOD::setMusicVolume(int vol) { + _maxvol = vol; +} + +void Player_MOD::setUpdateProc(ModUpdateProc *proc, void *param, int freq) { + _playproc = proc; + _playparam = param; + _mixamt = _samplerate / freq; +} +void Player_MOD::clearUpdateProc() { + _playproc = NULL; + _playparam = NULL; + _mixamt = 0; +} + +void Player_MOD::startChannel(int id, void *data, int size, int rate, uint8 vol, int loopStart, int loopEnd, int8 pan) { + int i; + if (id == 0) + error("player_mod - attempted to start channel id 0"); + + for (i = 0; i < MOD_MAXCHANS; i++) { + if (!_channels[i].id) + break; + } + if (i == MOD_MAXCHANS) { + warning("player_mod - too many music channels playing (%i max)",MOD_MAXCHANS); + return; + } + _channels[i].id = id; + _channels[i].vol = vol; + _channels[i].pan = pan; + _channels[i].freq = rate; + _channels[i].input = makeLinearInputStream(rate, Audio::Mixer::FLAG_AUTOFREE | (loopStart != loopEnd ? Audio::Mixer::FLAG_LOOP : 0), (const byte*)data, size, loopStart, loopEnd - loopStart); + _channels[i].converter = Audio::makeRateConverter(rate, _mixer->getOutputRate(), false, false); +} + +void Player_MOD::stopChannel(int id) { + if (id == 0) + error("player_mod - attempted to stop channel id 0"); + for (int i = 0; i < MOD_MAXCHANS; i++) { + if (_channels[i].id == id) { + delete _channels[i].converter; + _channels[i].converter = NULL; + delete _channels[i].input; + _channels[i].input = NULL; + _channels[i].id = 0; + _channels[i].vol = 0; + _channels[i].freq = 0; + } + } +} +void Player_MOD::setChannelVol(int id, uint8 vol) { + if (id == 0) + error("player_mod - attempted to set volume for channel id 0"); + for (int i = 0; i < MOD_MAXCHANS; i++) { + if (_channels[i].id == id) { + _channels[i].vol = vol; + break; + } + } +} + +void Player_MOD::setChannelPan(int id, int8 pan) { + if (id == 0) + error("player_mod - attempted to set pan for channel id 0"); + for (int i = 0; i < MOD_MAXCHANS; i++) { + if (_channels[i].id == id) { + _channels[i].pan = pan; + break; + } + } +} + +void Player_MOD::setChannelFreq(int id, int freq) { + if (id == 0) + error("player_mod - attempted to set frequency for channel id 0"); + for (int i = 0; i < MOD_MAXCHANS; i++) { + if (_channels[i].id == id) { + _channels[i].freq = freq; + delete _channels[i].converter; + _channels[i].converter = Audio::makeRateConverter(freq, _mixer->getOutputRate(), false, false); + break; + } + } +} + +void Player_MOD::do_mix(int16 *data, uint len) { + int i; + int dpos = 0; + uint dlen = 0; + memset(data, 0, 2 * len * sizeof(int16)); + while (len) { + if (_playproc) { + dlen = _mixamt - _mixpos; + if (!_mixpos) + _playproc(_playparam); + if (dlen <= len) { + _mixpos = 0; + len -= dlen; + } else { + _mixpos = _mixamt - len; + dlen = len; + len = 0; + } + } else { + dlen = len; + len = 0; + } + for (i = 0; i < MOD_MAXCHANS; i++) + if (_channels[i].id) { + Audio::st_volume_t vol_l = (127 - _channels[i].pan) * _channels[i].vol / 127; + Audio::st_volume_t vol_r = (127 + _channels[i].pan) * _channels[i].vol / 127; + _channels[i].converter->flow(*_channels[i].input, &data[dpos*2], dlen, vol_l, vol_r); + } + dpos += dlen; + } +} + +} // End of namespace Scumm |