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