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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef SOUND_MIXER_H
#define SOUND_MIXER_H
#include "stdafx.h"
#include "common/scummsys.h"
#include "common/system.h"
class AudioStream;
class Channel;
class File;
class PlayingSoundHandle {
friend class Channel;
friend class SoundMixer;
int val;
int getIndex() const { return val - 1; }
void setIndex(int i) { val = i + 1; }
void resetIndex() { val = 0; }
public:
PlayingSoundHandle() { resetIndex(); }
bool isActive() const { return val > 0; }
};
class SoundMixer {
public:
typedef void PremixProc (void *param, int16 *data, uint len);
enum {
NUM_CHANNELS = 16
};
enum {
FLAG_UNSIGNED = 1 << 0, /** unsigned samples (default: signed) */
FLAG_16BITS = 1 << 1, /** sound is 16 bits wide (default: 8bit) */
FLAG_LITTLE_ENDIAN = 1 << 2, /** sample is little endian (default: big endian) */
FLAG_STEREO = 1 << 3, /** sound is in stereo (default: mono) */
FLAG_REVERSE_STEREO = 1 << 4, /** reverse the left and right stereo channel */
FLAG_AUTOFREE = 1 << 5, /** sound buffer is freed automagically at the end of playing */
FLAG_LOOP = 1 << 6 /** loop the audio */
};
private:
OSystem *_syst;
OSystem::MutexRef _mutex;
void *_premixParam;
PremixProc *_premixProc;
uint _outputRate;
int _globalVolume;
int _musicVolume;
bool _paused;
Channel *_channels[NUM_CHANNELS];
bool _mixerReady;
public:
SoundMixer();
~SoundMixer();
/**
* Is the mixer ready and setup? This may not be the case on systems which
* don't support digital sound output. In that case, the mixer proc may
* never be called. That in turn can cause breakage in games which use the
* premix callback for syncing. In particular, the Adlib MIDI emulation...
*/
bool isReady() const { return _mixerReady; };
/**
* Set the premix procedure. This is mainly used for the adlib music, but
* is not limited to it. The premix proc is invoked by the mixer whenever
* it needs to generate any data, before any other mixing takes place. The
* premixer than has a chanve to fill the mix buffer with data (usually
* music samples). It should generate the specified number of 16bit stereo
* samples (i.e. len * 4 bytes). The endianess of these samples shall be
* the native endianess.
*/
void setupPremix(PremixProc *proc, void *param);
// start playing a raw sound
void playRaw(PlayingSoundHandle *handle, void *sound, uint32 size, uint rate, byte flags,
int id = -1, byte volume = 255, int8 balance = 0, uint32 loopStart = 0, uint32 loopEnd = 0);
#ifdef USE_MAD
void playMP3(PlayingSoundHandle *handle, File *file, uint32 size, byte volume = 255, int8 balance = 0, int id = -1);
#endif
#ifdef USE_VORBIS
void playVorbis(PlayingSoundHandle *handle, File *file, uint32 size, byte volume = 255, int8 balance = 0, int id = -1);
#endif
void playInputStream(PlayingSoundHandle *handle, AudioStream *input, bool isMusic, byte volume = 255, int8 balance = 0, int id = -1, bool autofreeStream = true);
/** Start a new stream. */
void newStream(PlayingSoundHandle *handle, uint rate, byte flags, uint32 buffer_size, byte volume = 255, int8 balance = 0);
/** Append to an existing stream. */
void appendStream(PlayingSoundHandle handle, void *sound, uint32 size);
/**
* Mark a stream as finished.
* Where stopHandle() would stop the sound immediately, when using this
* method, the stream will first finish playing all its data before it
* finally stops.
*/
void endStream(PlayingSoundHandle handle);
/** stop all currently playing sounds */
void stopAll();
/** stop playing the sound with given ID */
void stopID(int id);
/** stop playing the channel for the given handle */
void stopHandle(PlayingSoundHandle handle);
/** pause/unpause all channels */
void pauseAll(bool paused);
/** pause/unpause the sound with the given ID */
void pauseID(int id, bool paused);
/** pause/unpause the channel for the given handle */
void pauseHandle(PlayingSoundHandle handle, bool paused);
/** set the channel volume for the given handle (0 - 255) */
void setChannelVolume(PlayingSoundHandle handle, byte volume);
/** set the channel balance for the given handle (-127 ... 0 ... 127) (left ... center ... right)*/
void setChannelBalance(PlayingSoundHandle handle, int8 balance);
/** get approximation of for how long the channel has been playing */
uint32 getChannelElapsedTime(PlayingSoundHandle handle);
/** Check whether any SFX channel is active.*/
bool hasActiveSFXChannel();
/** set the global volume, 0-256 */
void setVolume(int volume);
/** query the global volume, 0-256 */
int getVolume() const { return _globalVolume; }
/** set the music volume, 0-256 */
void setMusicVolume(int volume);
/** query the music volume, 0-256 */
int getMusicVolume() const { return _musicVolume; }
/** query the output rate in kHz */
uint getOutputRate() const { return _outputRate; }
private:
void insertChannel(PlayingSoundHandle *handle, Channel *chan);
/** main mixer method */
void mix(int16 * buf, uint len);
static void mixCallback(void *s, byte *samples, int len);
};
#endif
|
