mirror of
https://github.com/libretro/scummvm.git
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351 lines
8.4 KiB
C++
351 lines
8.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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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*
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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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*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/random.h"
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#include "audio/mixer.h"
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#include "agi/agi.h"
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#include "agi/sound_sarien.h"
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namespace Agi {
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#define USE_INTERPOLATION
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static const int16 waveformRamp[WAVEFORM_SIZE] = {
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0, 8, 16, 24, 32, 40, 48, 56,
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64, 72, 80, 88, 96, 104, 112, 120,
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128, 136, 144, 152, 160, 168, 176, 184,
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192, 200, 208, 216, 224, 232, 240, 255,
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0, -248, -240, -232, -224, -216, -208, -200,
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-192, -184, -176, -168, -160, -152, -144, -136,
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-128, -120, -112, -104, -96, -88, -80, -72,
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-64, -56, -48, -40, -32, -24, -16, -8 // Ramp up
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};
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static const int16 waveformSquare[WAVEFORM_SIZE] = {
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255, 230, 220, 220, 220, 220, 220, 220,
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220, 220, 220, 220, 220, 220, 220, 220,
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220, 220, 220, 220, 220, 220, 220, 220,
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220, 220, 220, 220, 220, 220, 220, 110,
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-255, -230, -220, -220, -220, -220, -220, -220,
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-220, -220, -220, -220, -220, -220, -220, -220,
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-220, -220, -220, -220, -220, -220, -220, -220,
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-220, -220, -220, -110, 0, 0, 0, 0 // Square
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};
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static const int16 waveformMac[WAVEFORM_SIZE] = {
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45, 110, 135, 161, 167, 173, 175, 176,
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156, 137, 123, 110, 91, 72, 35, -2,
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-60, -118, -142, -165, -170, -176, -177, -179,
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-177, -176, -164, -152, -117, -82, -17, 47,
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92, 137, 151, 166, 170, 173, 171, 169,
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151, 133, 116, 100, 72, 43, -7, -57,
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-99, -141, -156, -170, -174, -177, -178, -179,
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-175, -172, -165, -159, -137, -114, -67, -19
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};
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SoundGenSarien::SoundGenSarien(AgiBase *vm, Audio::Mixer *pMixer) : SoundGen(vm, pMixer), _chn() {
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_sndBuffer = (int16 *)calloc(2, BUFFER_SIZE);
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memset(_sndBuffer, 0, BUFFER_SIZE << 1);
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_env = false;
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_playingSound = -1;
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_playing = false;
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_useChorus = true; // FIXME: Currently always true?
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switch (_vm->_soundemu) {
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default:
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case SOUND_EMU_NONE:
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_waveform = waveformRamp;
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_env = true;
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break;
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case SOUND_EMU_AMIGA:
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case SOUND_EMU_PC:
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_waveform = waveformSquare;
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break;
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case SOUND_EMU_MAC:
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_waveform = waveformMac;
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break;
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}
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if (_env) {
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debug(0, "Initializing sound: envelopes enabled (decay=%d, sustain=%d)", ENV_DECAY, ENV_SUSTAIN);
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} else {
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debug(0, "Initializing sound: envelopes disabled");
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}
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_mixer->playStream(Audio::Mixer::kMusicSoundType, _soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
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}
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SoundGenSarien::~SoundGenSarien() {
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_mixer->stopHandle(*_soundHandle);
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free(_sndBuffer);
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}
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int SoundGenSarien::readBuffer(int16 *buffer, const int numSamples) {
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fillAudio(buffer, numSamples / 2);
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return numSamples;
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}
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void SoundGenSarien::play(int resnum) {
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AgiSoundEmuType type;
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type = (AgiSoundEmuType)_vm->_game.sounds[resnum]->type();
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assert(type == AGI_SOUND_4CHN);
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_playingSound = resnum;
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PCjrSound *pcjrSound = (PCjrSound *) _vm->_game.sounds[resnum];
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// Initialize channel info
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for (int i = 0; i < NUM_CHANNELS; i++) {
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_chn[i].type = type;
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_chn[i].flags = AGI_SOUND_LOOP;
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if (_env) {
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_chn[i].flags |= AGI_SOUND_ENVELOPE;
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_chn[i].adsr = AGI_SOUND_ENV_ATTACK;
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}
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_chn[i].ins = _waveform;
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_chn[i].size = WAVEFORM_SIZE;
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_chn[i].ptr = pcjrSound->getVoicePointer(i % 4);
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_chn[i].timer = 0;
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_chn[i].vol = 0;
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_chn[i].end = 0;
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}
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memset(_sndBuffer, 0, BUFFER_SIZE << 1);
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}
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void SoundGenSarien::stop() {
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_playingSound = -1;
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for (int i = 0; i < NUM_CHANNELS; i++)
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stopNote(i);
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}
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void SoundGenSarien::stopNote(int i) {
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_chn[i].adsr = AGI_SOUND_ENV_RELEASE;
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if (_useChorus) {
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// Stop chorus ;)
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if (_chn[i].type == AGI_SOUND_4CHN &&
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_vm->_soundemu == SOUND_EMU_NONE && i < 3) {
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stopNote(i + 4);
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}
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}
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}
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void SoundGenSarien::playNote(int i, int freq, int vol) {
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if (!_vm->getFlag(VM_FLAG_SOUND_ON))
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vol = 0;
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else if (vol && _vm->_soundemu == SOUND_EMU_PC)
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vol = 160;
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_chn[i].phase = 0;
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_chn[i].freq = freq;
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_chn[i].vol = vol;
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_chn[i].env = 0x10000;
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_chn[i].adsr = AGI_SOUND_ENV_ATTACK;
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if (_useChorus) {
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// Add chorus ;)
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if (_chn[i].type == AGI_SOUND_4CHN &&
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_vm->_soundemu == SOUND_EMU_NONE && i < 3) {
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int newfreq = freq * 1007 / 1000;
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if (freq == newfreq)
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newfreq++;
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playNote(i + 4, newfreq, vol * 2 / 3);
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}
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}
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}
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void SoundGenSarien::playSound() {
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int i;
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AgiNote note;
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if (_playingSound == -1)
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return;
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_playing = false;
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for (i = 0; i < (_vm->_soundemu == SOUND_EMU_PC ? 1 : 4); i++) {
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_playing |= !_chn[i].end;
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note.read(_chn[i].ptr); // Read a single note (Doesn't advance the pointer)
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if (_chn[i].end)
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continue;
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if ((--_chn[i].timer) <= 0) {
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stopNote(i);
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if (note.freqDiv != 0) {
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int volume = (note.attenuation == 0x0F) ? 0 : (0xFF - note.attenuation * 2);
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playNote(i, note.freqDiv * 10, volume);
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}
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_chn[i].timer = note.duration;
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if (_chn[i].timer == 0xffff) {
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_chn[i].end = 1;
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_chn[i].vol = 0;
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_chn[i].env = 0;
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if (_useChorus) {
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// chorus
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if (_chn[i].type == AGI_SOUND_4CHN && _vm->_soundemu == SOUND_EMU_NONE && i < 3) {
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_chn[i + 4].vol = 0;
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_chn[i + 4].env = 0;
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}
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}
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}
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_chn[i].ptr += 5; // Advance the pointer to the next note data (5 bytes per note)
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}
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}
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if (!_playing) {
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_vm->_sound->soundIsFinished();
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_playingSound = -1;
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}
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}
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uint32 SoundGenSarien::mixSound() {
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int i, p;
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const int16 *src;
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int c, b, m;
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memset(_sndBuffer, 0, BUFFER_SIZE << 1);
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if (!_playing || _playingSound == -1)
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return BUFFER_SIZE;
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// Handle PCjr 4-channel sound mixing here
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for (c = 0; c < NUM_CHANNELS; c++) {
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if (!_chn[c].vol)
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continue;
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m = _chn[c].flags & AGI_SOUND_ENVELOPE ?
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_chn[c].vol * _chn[c].env >> 16 : _chn[c].vol;
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if (_chn[c].type != AGI_SOUND_4CHN || c != 3) {
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src = _chn[c].ins;
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p = _chn[c].phase;
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for (i = 0; i < BUFFER_SIZE; i++) {
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b = src[p >> 8];
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#ifdef USE_INTERPOLATION
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b += ((src[((p >> 8) + 1) % _chn[c].size] - src[p >> 8]) * (p & 0xff)) >> 8;
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#endif
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_sndBuffer[i] += (b * m) >> 4;
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p += (uint32) 118600 * 4 / _chn[c].freq;
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// FIXME: Fingolfin asks: why is there a FIXME here? Please either clarify what
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// needs fixing, or remove it!
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// FIXME
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if (_chn[c].flags & AGI_SOUND_LOOP) {
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p %= _chn[c].size << 8;
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} else {
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if (p >= _chn[c].size << 8) {
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p = _chn[c].vol = 0;
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_chn[c].end = 1;
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break;
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}
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}
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}
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_chn[c].phase = p;
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} else {
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// Add white noise
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for (i = 0; i < BUFFER_SIZE; i++) {
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b = _vm->_rnd->getRandomNumber(255) - 128;
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_sndBuffer[i] += (b * m) >> 4;
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}
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}
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switch (_chn[c].adsr) {
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case AGI_SOUND_ENV_ATTACK:
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// not implemented
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_chn[c].adsr = AGI_SOUND_ENV_DECAY;
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break;
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case AGI_SOUND_ENV_DECAY:
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if (_chn[c].env > _chn[c].vol * ENV_SUSTAIN + ENV_DECAY) {
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_chn[c].env -= ENV_DECAY;
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} else {
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_chn[c].env = _chn[c].vol * ENV_SUSTAIN;
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_chn[c].adsr = AGI_SOUND_ENV_SUSTAIN;
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}
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break;
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case AGI_SOUND_ENV_SUSTAIN:
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break;
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case AGI_SOUND_ENV_RELEASE:
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if (_chn[c].env >= ENV_RELEASE) {
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_chn[c].env -= ENV_RELEASE;
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} else {
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_chn[c].env = 0;
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}
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break;
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default:
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break;
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}
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}
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return BUFFER_SIZE;
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}
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void SoundGenSarien::fillAudio(int16 *stream, uint len) {
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uint32 p = 0;
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// current number of audio bytes in _sndBuffer
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static uint32 data_available = 0;
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// offset of start of audio bytes in _sndBuffer
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static uint32 data_offset = 0;
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len <<= 2;
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debugC(5, kDebugLevelSound, "(%p, %d)", (void *)stream, len);
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while (len > data_available) {
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memcpy((uint8 *)stream + p, (uint8 *)_sndBuffer + data_offset, data_available);
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p += data_available;
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len -= data_available;
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playSound();
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data_available = mixSound() << 1;
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data_offset = 0;
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}
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memcpy((uint8 *)stream + p, (uint8 *)_sndBuffer + data_offset, len);
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data_offset += len;
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data_available -= len;
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}
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} // End of namespace Agi
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