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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#ifndef SCUMM_PLAYER_V2_H
#define SCUMM_PLAYER_V2_H
#include "common/scummsys.h"
#include "common/mutex.h"
#include "scumm/music.h"
#include "sound/audiostream.h"
#include "sound/mixer.h"
namespace Scumm {
class ScummEngine;
#include "common/pack-start.h" // START STRUCT PACKING
struct channel_data {
uint16 time_left; // 00
uint16 next_cmd; // 02
uint16 base_freq; // 04
uint16 freq_delta; // 06
uint16 freq; // 08
uint16 volume; // 10
uint16 volume_delta; // 12
uint16 tempo; // 14
uint16 inter_note_pause; // 16
uint16 transpose; // 18
uint16 note_length; // 20
uint16 hull_curve; // 22
uint16 hull_offset; // 24
uint16 hull_counter; // 26
uint16 freqmod_table; // 28
uint16 freqmod_offset; // 30
uint16 freqmod_incr; // 32
uint16 freqmod_multiplier; // 34
uint16 freqmod_modulo; // 36
uint16 unknown[4]; // 38 - 44
uint16 music_timer; // 46
uint16 music_script_nr; // 48
};
#include "common/pack-end.h" // END STRUCT PACKING
/**
* 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 Audio::AudioStream, public MusicEngine {
public:
Player_V2(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr);
virtual ~Player_V2();
virtual void setMusicVolume(int vol);
virtual void startSound(int sound);
virtual void stopSound(int sound);
virtual void stopAllSounds();
virtual int getMusicTimer() const;
virtual int getSoundStatus(int sound) const;
// AudioStream API
int readBuffer(int16 *buffer, const int numSamples) {
do_mix(buffer, numSamples / 2);
return numSamples;
}
bool isStereo() const { return true; }
bool endOfData() const { return false; }
int getRate() const { return _sample_rate; }
protected:
bool _isV3Game;
Audio::Mixer *_mixer;
Audio::SoundHandle _soundHandle;
ScummEngine *_vm;
bool _pcjr;
int _header_len;
uint32 _sample_rate;
uint32 _next_tick;
uint32 _tick_len;
unsigned int _update_step;
unsigned int _decay;
int _level;
unsigned int _RNG;
unsigned int _volumetable[16];
int _timer_count[4];
int _timer_output;
int _current_nr;
byte *_current_data;
int _next_nr;
byte *_next_data;
byte *_retaddr;
private:
union ChannelInfo {
channel_data d;
uint16 array[sizeof(channel_data)/2];
};
int _music_timer;
int _music_timer_ctr;
int _ticks_per_music_timer;
const uint16 *_freqs_table;
Common::Mutex _mutex;
ChannelInfo _channels[5];
protected:
void mutex_up();
void mutex_down();
virtual void nextTick();
virtual void clear_channel(int i);
virtual void chainSound(int nr, byte *data);
virtual void chainNextSound();
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);
private:
void do_mix(int16 *buf, uint len);
void set_pcjr(bool pcjr);
void execute_cmd(ChannelInfo *channel);
void next_freqs(ChannelInfo *channel);
};
} // End of namespace Scumm
#endif
|
