2 * QEMU Timer based audio emulation
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
25 #include "qemu/osdep.h"
26 #include "qemu/host-utils.h"
27 #include "qemu/module.h"
29 #include "qemu/timer.h"
31 #define AUDIO_CAP "noaudio"
32 #include "audio_int.h"
34 typedef struct NoVoiceOut
{
39 typedef struct NoVoiceIn
{
44 static size_t no_write(HWVoiceOut
*hw
, void *buf
, size_t len
)
46 NoVoiceOut
*no
= (NoVoiceOut
*) hw
;
47 return audio_rate_get_bytes(&hw
->info
, &no
->rate
, len
);
50 static int no_init_out(HWVoiceOut
*hw
, struct audsettings
*as
, void *drv_opaque
)
52 NoVoiceOut
*no
= (NoVoiceOut
*) hw
;
54 audio_pcm_init_info (&hw
->info
, as
);
56 audio_rate_start(&no
->rate
);
60 static void no_fini_out (HWVoiceOut
*hw
)
65 static int no_ctl_out (HWVoiceOut
*hw
, int cmd
, ...)
67 NoVoiceOut
*no
= (NoVoiceOut
*) hw
;
69 if (cmd
== VOICE_ENABLE
) {
70 audio_rate_start(&no
->rate
);
75 static int no_init_in(HWVoiceIn
*hw
, struct audsettings
*as
, void *drv_opaque
)
77 NoVoiceIn
*no
= (NoVoiceIn
*) hw
;
79 audio_pcm_init_info (&hw
->info
, as
);
81 audio_rate_start(&no
->rate
);
85 static void no_fini_in (HWVoiceIn
*hw
)
90 static size_t no_read(HWVoiceIn
*hw
, void *buf
, size_t size
)
92 NoVoiceIn
*no
= (NoVoiceIn
*) hw
;
93 int64_t bytes
= audio_rate_get_bytes(&hw
->info
, &no
->rate
, size
);
95 audio_pcm_info_clear_buf(&hw
->info
, buf
, bytes
>> hw
->info
.shift
);
99 static int no_ctl_in (HWVoiceIn
*hw
, int cmd
, ...)
101 NoVoiceIn
*no
= (NoVoiceIn
*) hw
;
103 if (cmd
== VOICE_ENABLE
) {
104 audio_rate_start(&no
->rate
);
109 static void *no_audio_init(Audiodev
*dev
)
111 return &no_audio_init
;
114 static void no_audio_fini (void *opaque
)
119 static struct audio_pcm_ops no_pcm_ops
= {
120 .init_out
= no_init_out
,
121 .fini_out
= no_fini_out
,
123 .ctl_out
= no_ctl_out
,
125 .init_in
= no_init_in
,
126 .fini_in
= no_fini_in
,
131 static struct audio_driver no_audio_driver
= {
133 .descr
= "Timer based audio emulation",
134 .init
= no_audio_init
,
135 .fini
= no_audio_fini
,
136 .pcm_ops
= &no_pcm_ops
,
138 .max_voices_out
= INT_MAX
,
139 .max_voices_in
= INT_MAX
,
140 .voice_size_out
= sizeof (NoVoiceOut
),
141 .voice_size_in
= sizeof (NoVoiceIn
)
144 static void register_audio_none(void)
146 audio_driver_register(&no_audio_driver
);
148 type_init(register_audio_none
);