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/* 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.
*
* $Header$
*
*/
#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
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