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 int no_run_out (HWVoiceOut
*hw
, int live
)
46 NoVoiceOut
*no
= (NoVoiceOut
*) hw
;
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
= audio_MIN(bytes
, INT_MAX
);
56 samples
= bytes
>> hw
->info
.shift
;
59 decr
= audio_MIN (live
, samples
);
60 hw
->rpos
= (hw
->rpos
+ decr
) % hw
->samples
;
64 static int no_write (SWVoiceOut
*sw
, void *buf
, int len
)
66 return audio_pcm_sw_write(sw
, buf
, len
);
69 static int no_init_out(HWVoiceOut
*hw
, struct audsettings
*as
, void *drv_opaque
)
71 audio_pcm_init_info (&hw
->info
, as
);
76 static void no_fini_out (HWVoiceOut
*hw
)
81 static int no_ctl_out (HWVoiceOut
*hw
, int cmd
, ...)
88 static int no_init_in(HWVoiceIn
*hw
, struct audsettings
*as
, void *drv_opaque
)
90 audio_pcm_init_info (&hw
->info
, as
);
95 static void no_fini_in (HWVoiceIn
*hw
)
100 static int no_run_in (HWVoiceIn
*hw
)
102 NoVoiceIn
*no
= (NoVoiceIn
*) hw
;
103 int live
= audio_pcm_hw_get_live_in (hw
);
104 int dead
= hw
->samples
- live
;
108 int64_t now
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
109 int64_t ticks
= now
- no
->old_ticks
;
111 muldiv64(ticks
, hw
->info
.bytes_per_second
, NANOSECONDS_PER_SECOND
);
114 bytes
= audio_MIN (bytes
, INT_MAX
);
115 samples
= bytes
>> hw
->info
.shift
;
116 samples
= audio_MIN (samples
, dead
);
121 static int no_read (SWVoiceIn
*sw
, void *buf
, int size
)
123 /* use custom code here instead of audio_pcm_sw_read() to avoid
124 * useless resampling/mixing */
125 int samples
= size
>> sw
->info
.shift
;
126 int total
= sw
->hw
->total_samples_captured
- sw
->total_hw_samples_acquired
;
127 int to_clear
= audio_MIN (samples
, total
);
128 sw
->total_hw_samples_acquired
+= total
;
129 audio_pcm_info_clear_buf (&sw
->info
, buf
, to_clear
);
130 return to_clear
<< sw
->info
.shift
;
133 static int no_ctl_in (HWVoiceIn
*hw
, int cmd
, ...)
140 static void *no_audio_init(Audiodev
*dev
)
142 return &no_audio_init
;
145 static void no_audio_fini (void *opaque
)
150 static struct audio_pcm_ops no_pcm_ops
= {
151 .init_out
= no_init_out
,
152 .fini_out
= no_fini_out
,
153 .run_out
= no_run_out
,
155 .ctl_out
= no_ctl_out
,
157 .init_in
= no_init_in
,
158 .fini_in
= no_fini_in
,
164 static struct audio_driver no_audio_driver
= {
166 .descr
= "Timer based audio emulation",
167 .init
= no_audio_init
,
168 .fini
= no_audio_fini
,
169 .pcm_ops
= &no_pcm_ops
,
171 .max_voices_out
= INT_MAX
,
172 .max_voices_in
= INT_MAX
,
173 .voice_size_out
= sizeof (NoVoiceOut
),
174 .voice_size_in
= sizeof (NoVoiceIn
)
177 static void register_audio_none(void)
179 audio_driver_register(&no_audio_driver
);
181 type_init(register_audio_none
);