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
|
/*
* QEMU Timer based audio emulation
*
* Copyright (c) 2004-2005 Vassili Karpov (malc)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include "qemu/module.h"
#include "audio.h"
#include "qemu/timer.h"
#define AUDIO_CAP "noaudio"
#include "audio_int.h"
typedef struct NoVoiceOut {
HWVoiceOut hw;
int64_t old_ticks;
} NoVoiceOut;
typedef struct NoVoiceIn {
HWVoiceIn hw;
int64_t old_ticks;
} NoVoiceIn;
static size_t no_run_out(HWVoiceOut *hw, size_t live)
{
NoVoiceOut *no = (NoVoiceOut *) hw;
size_t decr, samples;
int64_t now;
int64_t ticks;
int64_t bytes;
now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
ticks = now - no->old_ticks;
bytes = muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
bytes = MIN(bytes, SIZE_MAX);
samples = bytes >> hw->info.shift;
no->old_ticks = now;
decr = MIN (live, samples);
hw->rpos = (hw->rpos + decr) % hw->samples;
return decr;
}
static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
{
audio_pcm_init_info (&hw->info, as);
hw->samples = 1024;
return 0;
}
static void no_fini_out (HWVoiceOut *hw)
{
(void) hw;
}
static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
{
(void) hw;
(void) cmd;
return 0;
}
static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
{
audio_pcm_init_info (&hw->info, as);
hw->samples = 1024;
return 0;
}
static void no_fini_in (HWVoiceIn *hw)
{
(void) hw;
}
static size_t no_run_in(HWVoiceIn *hw)
{
NoVoiceIn *no = (NoVoiceIn *) hw;
size_t live = audio_pcm_hw_get_live_in(hw);
size_t dead = hw->samples - live;
size_t samples = 0;
if (dead) {
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
int64_t ticks = now - no->old_ticks;
int64_t bytes =
muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
no->old_ticks = now;
bytes = MIN (bytes, SIZE_MAX);
samples = bytes >> hw->info.shift;
samples = MIN (samples, dead);
}
return samples;
}
static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
{
(void) hw;
(void) cmd;
return 0;
}
static void *no_audio_init(Audiodev *dev)
{
return &no_audio_init;
}
static void no_audio_fini (void *opaque)
{
(void) opaque;
}
static struct audio_pcm_ops no_pcm_ops = {
.init_out = no_init_out,
.fini_out = no_fini_out,
.run_out = no_run_out,
.ctl_out = no_ctl_out,
.init_in = no_init_in,
.fini_in = no_fini_in,
.run_in = no_run_in,
.ctl_in = no_ctl_in
};
static struct audio_driver no_audio_driver = {
.name = "none",
.descr = "Timer based audio emulation",
.init = no_audio_init,
.fini = no_audio_fini,
.pcm_ops = &no_pcm_ops,
.can_be_default = 1,
.max_voices_out = INT_MAX,
.max_voices_in = INT_MAX,
.voice_size_out = sizeof (NoVoiceOut),
.voice_size_in = sizeof (NoVoiceIn)
};
static void register_audio_none(void)
{
audio_driver_register(&no_audio_driver);
}
type_init(register_audio_none);
|
