1/*
2 * QEMU Timer based audio emulation
3 *
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25#include "qemu/osdep.h"
26#include "qemu/host-utils.h"
27#include "qemu/module.h"
28#include "audio.h"
29#include "qemu/timer.h"
30
31#define AUDIO_CAP "noaudio"
32#include "audio_int.h"
33
34typedef struct NoVoiceOut {
35 HWVoiceOut hw;
36 int64_t old_ticks;
37} NoVoiceOut;
38
39typedef struct NoVoiceIn {
40 HWVoiceIn hw;
41 int64_t old_ticks;
42} NoVoiceIn;
43
44static size_t no_run_out(HWVoiceOut *hw, size_t live)
45{
46 NoVoiceOut *no = (NoVoiceOut *) hw;
47 size_t decr, samples;
48 int64_t now;
49 int64_t ticks;
50 int64_t bytes;
51
52 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
53 ticks = now - no->old_ticks;
54 bytes = muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
55 bytes = MIN(bytes, SIZE_MAX);
56 samples = bytes >> hw->info.shift;
57
58 no->old_ticks = now;
59 decr = MIN (live, samples);
60 hw->rpos = (hw->rpos + decr) % hw->samples;
61 return decr;
62}
63
64static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
65{
66 audio_pcm_init_info (&hw->info, as);
67 hw->samples = 1024;
68 return 0;
69}
70
71static void no_fini_out (HWVoiceOut *hw)
72{
73 (void) hw;
74}
75
76static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
77{
78 (void) hw;
79 (void) cmd;
80 return 0;
81}
82
83static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
84{
85 audio_pcm_init_info (&hw->info, as);
86 hw->samples = 1024;
87 return 0;
88}
89
90static void no_fini_in (HWVoiceIn *hw)
91{
92 (void) hw;
93}
94
95static size_t no_run_in(HWVoiceIn *hw)
96{
97 NoVoiceIn *no = (NoVoiceIn *) hw;
98 size_t live = audio_pcm_hw_get_live_in(hw);
99 size_t dead = hw->samples - live;
100 size_t samples = 0;
101
102 if (dead) {
103 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
104 int64_t ticks = now - no->old_ticks;
105 int64_t bytes =
106 muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
107
108 no->old_ticks = now;
109 bytes = MIN (bytes, SIZE_MAX);
110 samples = bytes >> hw->info.shift;
111 samples = MIN (samples, dead);
112 }
113 return samples;
114}
115
116static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
117{
118 (void) hw;
119 (void) cmd;
120 return 0;
121}
122
123static void *no_audio_init(Audiodev *dev)
124{
125 return &no_audio_init;
126}
127
128static void no_audio_fini (void *opaque)
129{
130 (void) opaque;
131}
132
133static struct audio_pcm_ops no_pcm_ops = {
134 .init_out = no_init_out,
135 .fini_out = no_fini_out,
136 .run_out = no_run_out,
137 .ctl_out = no_ctl_out,
138
139 .init_in = no_init_in,
140 .fini_in = no_fini_in,
141 .run_in = no_run_in,
142 .ctl_in = no_ctl_in
143};
144
145static struct audio_driver no_audio_driver = {
146 .name = "none",
147 .descr = "Timer based audio emulation",
148 .init = no_audio_init,
149 .fini = no_audio_fini,
150 .pcm_ops = &no_pcm_ops,
151 .can_be_default = 1,
152 .max_voices_out = INT_MAX,
153 .max_voices_in = INT_MAX,
154 .voice_size_out = sizeof (NoVoiceOut),
155 .voice_size_in = sizeof (NoVoiceIn)
156};
157
158static void register_audio_none(void)
159{
160 audio_driver_register(&no_audio_driver);
161}
162type_init(register_audio_none);
163