1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/* 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.
*
*/
#ifndef SCUMM_PLAYER_V2_H
#define SCUMM_PLAYER_V2_H
#include "scumm/player_v2base.h"
namespace Scumm {
/**
* Scumm V2 PC-Speaker MIDI driver.
* This simulates the pc speaker sound, which is driven by the 8253 (square
* wave generator) and a low-band filter.
*/
class Player_V2 : public Player_V2Base {
public:
Player_V2(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr);
virtual ~Player_V2();
// MusicEngine API
virtual void setMusicVolume(int vol);
virtual void startSound(int sound);
virtual void stopSound(int sound);
virtual void stopAllSounds();
// virtual int getMusicTimer();
virtual int getSoundStatus(int sound) const;
// AudioStream API
virtual int readBuffer(int16 *buffer, const int numSamples);
protected:
unsigned int _update_step;
unsigned int _decay;
int _level;
unsigned int _RNG;
unsigned int _volumetable[16];
int _timer_count[4];
int _timer_output;
protected:
virtual void generateSpkSamples(int16 *data, uint len);
virtual void generatePCjrSamples(int16 *data, uint len);
void lowPassFilter(int16 *data, uint len);
void squareGenerator(int channel, int freq, int vol,
int noiseFeedback, int16 *sample, uint len);
};
} // End of namespace Scumm
#endif
|
