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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 "scumm/player_mod.h"
#include "sound/mixer.h"
#include "sound/rate.h"
namespace Scumm {
Player_MOD::Player_MOD(Audio::Mixer *mixer) {
int i;
_mixer = 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].input = NULL;
_channels[i].ctr = 0;
_channels[i].pos = 0;
}
_playproc = NULL;
_playparam = NULL;
_mixer->playInputStream(Audio::Mixer::kPlainSoundType, &_soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, false, true);
}
Player_MOD::~Player_MOD() {
_mixer->stopHandle(_soundHandle);
for (int i = 0; i < MOD_MAXCHANS; i++) {
if (!_channels[i].id)
continue;
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].ctr = 0;
_channels[i].input = Audio::makeLinearInputStream((const byte*)data, size, rate, Audio::Mixer::FLAG_AUTOFREE | (loopStart != loopEnd ? Audio::Mixer::FLAG_LOOP : 0), loopStart, loopEnd);
// read the first sample
_channels[i].input->readBuffer(&_channels[i].pos, 1);
}
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].input;
_channels[i].input = NULL;
_channels[i].id = 0;
_channels[i].vol = 0;
_channels[i].freq = 0;
_channels[i].ctr = 0;
_channels[i].pos = 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) {
if (freq > 31400) // this is about as high as WinUAE goes
freq = 31400; // can't easily verify on my own Amiga
_channels[i].freq = freq;
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;
for (uint j = 0; j < dlen; j++) {
// simple linear resample, unbuffered
int delta = (uint32)(_channels[i].freq * 0x10000) / _samplerate;
uint16 cfrac = ~_channels[i].ctr & 0xFFFF;
if (_channels[i].ctr + delta < 0x10000)
cfrac = delta;
_channels[i].ctr += delta;
int32 cpos = _channels[i].pos * cfrac / 0x10000;
while (_channels[i].ctr >= 0x10000) {
if (_channels[i].input->readBuffer(&_channels[i].pos, 1) != 1) { // out of data
stopChannel(_channels[i].id);
goto skipchan; // exit 2 loops at once
}
_channels[i].ctr -= 0x10000;
if (_channels[i].ctr > 0x10000)
cpos += _channels[i].pos;
else
cpos += (int32)(_channels[i].pos * (_channels[i].ctr & 0xFFFF)) / 0x10000;
}
int16 pos = 0;
// if too many samples play in a row, the calculation below will overflow and clip
// so try and split it up into pieces it can manage comfortably
while (cpos < -0x8000) {
pos -= 0x80000000 / delta;
cpos += 0x8000;
}
while (cpos > 0x7FFF) {
pos += 0x7FFF0000 / delta;
cpos -= 0x7FFF;
}
pos += cpos * 0x10000 / delta;
Audio::clampedAdd(data[(dpos + j) * 2 + 0], pos * vol_l / Audio::Mixer::kMaxMixerVolume);
Audio::clampedAdd(data[(dpos + j) * 2 + 1], pos * vol_r / Audio::Mixer::kMaxMixerVolume);
}
}
skipchan: ; // channel ran out of data
}
dpos += dlen;
}
}
} // End of namespace Scumm
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