109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
/* REminiscence - Flashback interpreter
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* Copyright (C) 2005-2015 Gregory Montoir
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MIXER_H__
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#define MIXER_H__
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#include "intern.h"
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#include "mod_player.h"
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#include "ogg_player.h"
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#include "sfx_player.h"
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struct MixerChunk {
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uint8_t *data;
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uint32_t len;
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MixerChunk()
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: data(0), len(0) {
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}
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int8_t getPCM(int offset) const {
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if (offset < 0) {
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offset = 0;
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} else if (offset >= (int)len) {
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offset = len - 1;
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}
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return (int8_t)data[offset];
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}
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};
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struct MixerChannel {
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uint8_t active;
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uint8_t volume;
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MixerChunk chunk;
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uint32_t chunkPos;
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uint32_t chunkInc;
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};
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struct FileSystem;
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struct SystemStub;
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struct Mixer {
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typedef bool (*PremixHook)(void *userData, int8_t *buf, int len);
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enum MusicType {
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MT_NONE,
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MT_MOD,
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MT_OGG,
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MT_SFX,
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};
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enum {
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MUSIC_TRACK = 1000,
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NUM_CHANNELS = 4,
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FRAC_BITS = 12,
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MAX_VOLUME = 64
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};
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FileSystem *_fs;
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SystemStub *_stub;
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MixerChannel _channels[NUM_CHANNELS];
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PremixHook _premixHook;
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void *_premixHookData;
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MusicType _musicType;
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ModPlayer _mod;
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OggPlayer _ogg;
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SfxPlayer _sfx;
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int _musicTrack;
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Mixer(FileSystem *fs, SystemStub *stub);
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void init();
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void free();
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void setPremixHook(PremixHook premixHook, void *userData);
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void play(const MixerChunk *mc, uint16_t freq, uint8_t volume);
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bool isPlaying(const MixerChunk *mc) const;
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uint32_t getSampleRate() const;
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void stopAll();
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void playMusic(int num);
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void stopMusic();
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void mix(int8_t *buf, int len);
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static void addclamp(int8_t &a, int b);
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static void mixCallback(void *param, int8_t *buf, int len);
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};
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template <class T>
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int resampleLinear(T *sample, int pos, int step, int fracBits) {
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const int inputPos = pos >> fracBits;
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const int inputFrac = pos & ((1 << fracBits) - 1);
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int out = sample->getPCM(inputPos);
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out += (sample->getPCM(inputPos + 1) - out) * inputFrac >> fracBits;
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return out;
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}
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#endif // MIXER_H__
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