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
26 #define AUDIO_CAP "noaudio"
27 #include "audio_int.h"
29 typedef struct NoVoiceOut
{
34 typedef struct NoVoiceIn
{
39 static int no_run_out (HWVoiceOut
*hw
)
41 NoVoiceOut
*no
= (NoVoiceOut
*) hw
;
42 int live
, decr
, samples
;
47 live
= audio_pcm_hw_get_live_out (&no
->hw
);
52 now
= qemu_get_clock (vm_clock
);
53 ticks
= now
- no
->old_ticks
;
54 bytes
= (ticks
* hw
->info
.bytes_per_second
) / ticks_per_sec
;
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
, audsettings_t
*as
)
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
, audsettings_t
*as
)
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_get_clock (vm_clock
);
109 int64_t ticks
= now
- no
->old_ticks
;
110 int64_t bytes
= (ticks
* hw
->info
.bytes_per_second
) / ticks_per_sec
;
113 bytes
= audio_MIN (bytes
, INT_MAX
);
114 samples
= bytes
>> hw
->info
.shift
;
115 samples
= audio_MIN (samples
, dead
);
120 static int no_read (SWVoiceIn
*sw
, void *buf
, int size
)
122 int samples
= size
>> sw
->info
.shift
;
123 int total
= sw
->hw
->total_samples_captured
- sw
->total_hw_samples_acquired
;
124 int to_clear
= audio_MIN (samples
, total
);
125 audio_pcm_info_clear_buf (&sw
->info
, buf
, to_clear
);
129 static int no_ctl_in (HWVoiceIn
*hw
, int cmd
, ...)
136 static void *no_audio_init (void)
138 return &no_audio_init
;
141 static void no_audio_fini (void *opaque
)
146 static struct audio_pcm_ops no_pcm_ops
= {
160 struct audio_driver no_audio_driver
= {
161 INIT_FIELD (name
= ) "none",
162 INIT_FIELD (descr
= ) "Timer based audio emulation",
163 INIT_FIELD (options
= ) NULL
,
164 INIT_FIELD (init
= ) no_audio_init
,
165 INIT_FIELD (fini
= ) no_audio_fini
,
166 INIT_FIELD (pcm_ops
= ) &no_pcm_ops
,
167 INIT_FIELD (can_be_default
= ) 1,
168 INIT_FIELD (max_voices_out
= ) INT_MAX
,
169 INIT_FIELD (max_voices_in
= ) INT_MAX
,
170 INIT_FIELD (voice_size_out
= ) sizeof (NoVoiceOut
),
171 INIT_FIELD (voice_size_in
= ) sizeof (NoVoiceIn
)