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
|
/*
audio.oss (2007-12-26)
author: Nach
*/
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
//OSS4 soundcard.h includes below SNDCTL defines, but OSS3 does not
//However, OSS4 soundcard.h does not reside in <sys/>
//Therefore, attempt to manually define SNDCTL values if using OSS3 header
//Note that if the defines below fail to work on any specific platform, one can point soundcard.h
//above to the correct location for OSS4 (usually /usr/lib/oss/include/sys/soundcard.h)
//Failing that, one can disable OSS4 ioctl calls inside init() and remove the below defines
#ifndef SNDCTL_DSP_COOKEDMODE
#define SNDCTL_DSP_COOKEDMODE _IOW('P', 30, int)
#endif
#ifndef SNDCTL_DSP_POLICY
#define SNDCTL_DSP_POLICY _IOW('P', 45, int)
#endif
namespace ruby {
class pAudioOSS {
public:
struct {
int fd;
int format;
int channels;
const char* name;
} device;
struct {
unsigned frequency;
} settings;
bool cap(const string& name) {
if(name == Audio::Frequency) return true;
return false;
}
any get(const string& name) {
if(name == Audio::Frequency) return settings.frequency;
return false;
}
bool set(const string& name, const any& value) {
if(name == Audio::Frequency) {
settings.frequency = any_cast<unsigned>(value);
if(device.fd > 0) init();
return true;
}
return false;
}
void sample(uint16_t sl, uint16_t sr) {
uint32_t sample = sl + (sr << 16);
unsigned unused = write(device.fd, &sample, 4);
}
void clear() {
}
bool init() {
term();
device.fd = open(device.name, O_WRONLY, O_NONBLOCK);
if(device.fd < 0) return false;
#if 1 //SOUND_VERSION >= 0x040000
//attempt to enable OSS4-specific features regardless of version
//OSS3 ioctl calls will silently fail, but sound will still work
int cooked = 1, policy = 4; //policy should be 0 - 10, lower = less latency, more CPU usage
ioctl(device.fd, SNDCTL_DSP_COOKEDMODE, &cooked);
ioctl(device.fd, SNDCTL_DSP_POLICY, &policy);
#endif
int freq = settings.frequency;
ioctl(device.fd, SNDCTL_DSP_CHANNELS, &device.channels);
ioctl(device.fd, SNDCTL_DSP_SETFMT, &device.format);
ioctl(device.fd, SNDCTL_DSP_SPEED, &freq);
return true;
}
void term() {
if(device.fd > 0) {
close(device.fd);
device.fd = -1;
}
}
pAudioOSS() {
device.fd = -1;
device.format = AFMT_S16_LE;
device.channels = 2;
device.name = "/dev/dsp";
settings.frequency = 22050;
}
~pAudioOSS() {
term();
}
};
DeclareAudio(OSS)
};
|
