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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.
*
*/
#include "common/random.h"
#include "audio/mixer.h"
#include "agi/agi.h"
#include "agi/sound_sarien.h"
namespace Agi {
#define USE_INTERPOLATION
static const int16 waveformRamp[WAVEFORM_SIZE] = {
0, 8, 16, 24, 32, 40, 48, 56,
64, 72, 80, 88, 96, 104, 112, 120,
128, 136, 144, 152, 160, 168, 176, 184,
192, 200, 208, 216, 224, 232, 240, 255,
0, -248, -240, -232, -224, -216, -208, -200,
-192, -184, -176, -168, -160, -152, -144, -136,
-128, -120, -112, -104, -96, -88, -80, -72,
-64, -56, -48, -40, -32, -24, -16, -8 // Ramp up
};
static const int16 waveformSquare[WAVEFORM_SIZE] = {
255, 230, 220, 220, 220, 220, 220, 220,
220, 220, 220, 220, 220, 220, 220, 220,
220, 220, 220, 220, 220, 220, 220, 220,
220, 220, 220, 220, 220, 220, 220, 110,
-255, -230, -220, -220, -220, -220, -220, -220,
-220, -220, -220, -220, -220, -220, -220, -220,
-220, -220, -220, -220, -220, -220, -220, -220,
-220, -220, -220, -110, 0, 0, 0, 0 // Square
};
static const int16 waveformMac[WAVEFORM_SIZE] = {
45, 110, 135, 161, 167, 173, 175, 176,
156, 137, 123, 110, 91, 72, 35, -2,
-60, -118, -142, -165, -170, -176, -177, -179,
-177, -176, -164, -152, -117, -82, -17, 47,
92, 137, 151, 166, 170, 173, 171, 169,
151, 133, 116, 100, 72, 43, -7, -57,
-99, -141, -156, -170, -174, -177, -178, -179,
-175, -172, -165, -159, -137, -114, -67, -19
};
SoundGenSarien::SoundGenSarien(AgiBase *vm, Audio::Mixer *pMixer) : SoundGen(vm, pMixer), _chn() {
_sndBuffer = (int16 *)calloc(2, BUFFER_SIZE);
memset(_sndBuffer, 0, BUFFER_SIZE << 1);
_env = false;
_playingSound = -1;
_playing = false;
_useChorus = true; // FIXME: Currently always true?
switch (_vm->_soundemu) {
case SOUND_EMU_NONE:
_waveform = waveformRamp;
_env = true;
break;
case SOUND_EMU_AMIGA:
case SOUND_EMU_PC:
_waveform = waveformSquare;
break;
case SOUND_EMU_MAC:
_waveform = waveformMac;
break;
}
if (_env) {
debug(0, "Initializing sound: envelopes enabled (decay=%d, sustain=%d)", ENV_DECAY, ENV_SUSTAIN);
} else {
debug(0, "Initializing sound: envelopes disabled");
}
_mixer->playStream(Audio::Mixer::kMusicSoundType, _soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
}
SoundGenSarien::~SoundGenSarien() {
_mixer->stopHandle(*_soundHandle);
free(_sndBuffer);
}
int SoundGenSarien::readBuffer(int16 *buffer, const int numSamples) {
fillAudio(buffer, numSamples / 2);
return numSamples;
}
void SoundGenSarien::play(int resnum) {
AgiSoundEmuType type;
type = (AgiSoundEmuType)_vm->_game.sounds[resnum]->type();
assert(type == AGI_SOUND_4CHN);
_playingSound = resnum;
PCjrSound *pcjrSound = (PCjrSound *) _vm->_game.sounds[resnum];
// Initialize channel info
for (int i = 0; i < NUM_CHANNELS; i++) {
_chn[i].type = type;
_chn[i].flags = AGI_SOUND_LOOP;
if (_env) {
_chn[i].flags |= AGI_SOUND_ENVELOPE;
_chn[i].adsr = AGI_SOUND_ENV_ATTACK;
}
_chn[i].ins = _waveform;
_chn[i].size = WAVEFORM_SIZE;
_chn[i].ptr = pcjrSound->getVoicePointer(i % 4);
_chn[i].timer = 0;
_chn[i].vol = 0;
_chn[i].end = 0;
}
memset(_sndBuffer, 0, BUFFER_SIZE << 1);
}
void SoundGenSarien::stop() {
_playingSound = -1;
for (int i = 0; i < NUM_CHANNELS; i++)
stopNote(i);
}
void SoundGenSarien::stopNote(int i) {
_chn[i].adsr = AGI_SOUND_ENV_RELEASE;
if (_useChorus) {
// Stop chorus ;)
if (_chn[i].type == AGI_SOUND_4CHN &&
_vm->_soundemu == SOUND_EMU_NONE && i < 3) {
stopNote(i + 4);
}
}
}
void SoundGenSarien::playNote(int i, int freq, int vol) {
if (!_vm->getFlag(VM_FLAG_SOUND_ON))
vol = 0;
else if (vol && _vm->_soundemu == SOUND_EMU_PC)
vol = 160;
_chn[i].phase = 0;
_chn[i].freq = freq;
_chn[i].vol = vol;
_chn[i].env = 0x10000;
_chn[i].adsr = AGI_SOUND_ENV_ATTACK;
if (_useChorus) {
// Add chorus ;)
if (_chn[i].type == AGI_SOUND_4CHN &&
_vm->_soundemu == SOUND_EMU_NONE && i < 3) {
int newfreq = freq * 1007 / 1000;
if (freq == newfreq)
newfreq++;
playNote(i + 4, newfreq, vol * 2 / 3);
}
}
}
void SoundGenSarien::playSound() {
int i;
AgiNote note;
if (_playingSound == -1)
return;
_playing = false;
for (i = 0; i < (_vm->_soundemu == SOUND_EMU_PC ? 1 : 4); i++) {
_playing |= !_chn[i].end;
note.read(_chn[i].ptr); // Read a single note (Doesn't advance the pointer)
if (_chn[i].end)
continue;
if ((--_chn[i].timer) <= 0) {
stopNote(i);
if (note.freqDiv != 0) {
int volume = (note.attenuation == 0x0F) ? 0 : (0xFF - note.attenuation * 2);
playNote(i, note.freqDiv * 10, volume);
}
_chn[i].timer = note.duration;
if (_chn[i].timer == 0xffff) {
_chn[i].end = 1;
_chn[i].vol = 0;
_chn[i].env = 0;
if (_useChorus) {
// chorus
if (_chn[i].type == AGI_SOUND_4CHN && _vm->_soundemu == SOUND_EMU_NONE && i < 3) {
_chn[i + 4].vol = 0;
_chn[i + 4].env = 0;
}
}
}
_chn[i].ptr += 5; // Advance the pointer to the next note data (5 bytes per note)
}
}
if (!_playing) {
_vm->_sound->soundIsFinished();
_playingSound = -1;
}
}
uint32 SoundGenSarien::mixSound() {
register int i, p;
const int16 *src;
int c, b, m;
memset(_sndBuffer, 0, BUFFER_SIZE << 1);
if (!_playing || _playingSound == -1)
return BUFFER_SIZE;
// Handle PCjr 4-channel sound mixing here
for (c = 0; c < NUM_CHANNELS; c++) {
if (!_chn[c].vol)
continue;
m = _chn[c].flags & AGI_SOUND_ENVELOPE ?
_chn[c].vol * _chn[c].env >> 16 : _chn[c].vol;
if (_chn[c].type != AGI_SOUND_4CHN || c != 3) {
src = _chn[c].ins;
p = _chn[c].phase;
for (i = 0; i < BUFFER_SIZE; i++) {
b = src[p >> 8];
#ifdef USE_INTERPOLATION
b += ((src[((p >> 8) + 1) % _chn[c].size] - src[p >> 8]) * (p & 0xff)) >> 8;
#endif
_sndBuffer[i] += (b * m) >> 4;
p += (uint32) 118600 * 4 / _chn[c].freq;
// FIXME: Fingolfin asks: why is there a FIXME here? Please either clarify what
// needs fixing, or remove it!
// FIXME
if (_chn[c].flags & AGI_SOUND_LOOP) {
p %= _chn[c].size << 8;
} else {
if (p >= _chn[c].size << 8) {
p = _chn[c].vol = 0;
_chn[c].end = 1;
break;
}
}
}
_chn[c].phase = p;
} else {
// Add white noise
for (i = 0; i < BUFFER_SIZE; i++) {
b = _vm->_rnd->getRandomNumber(255) - 128;
_sndBuffer[i] += (b * m) >> 4;
}
}
switch (_chn[c].adsr) {
case AGI_SOUND_ENV_ATTACK:
// not implemented
_chn[c].adsr = AGI_SOUND_ENV_DECAY;
break;
case AGI_SOUND_ENV_DECAY:
if (_chn[c].env > _chn[c].vol * ENV_SUSTAIN + ENV_DECAY) {
_chn[c].env -= ENV_DECAY;
} else {
_chn[c].env = _chn[c].vol * ENV_SUSTAIN;
_chn[c].adsr = AGI_SOUND_ENV_SUSTAIN;
}
break;
case AGI_SOUND_ENV_SUSTAIN:
break;
case AGI_SOUND_ENV_RELEASE:
if (_chn[c].env >= ENV_RELEASE) {
_chn[c].env -= ENV_RELEASE;
} else {
_chn[c].env = 0;
}
}
}
return BUFFER_SIZE;
}
void SoundGenSarien::fillAudio(int16 *stream, uint len) {
uint32 p = 0;
// current number of audio bytes in _sndBuffer
static uint32 data_available = 0;
// offset of start of audio bytes in _sndBuffer
static uint32 data_offset = 0;
len <<= 2;
debugC(5, kDebugLevelSound, "(%p, %d)", (void *)stream, len);
while (len > data_available) {
memcpy((uint8 *)stream + p, (uint8 *)_sndBuffer + data_offset, data_available);
p += data_available;
len -= data_available;
playSound();
data_available = mixSound() << 1;
data_offset = 0;
}
memcpy((uint8 *)stream + p, (uint8 *)_sndBuffer + data_offset, len);
data_offset += len;
data_available -= len;
}
} // End of namespace Agi
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