scsi: convert to QEMU Object Model
[qemu.git] / audio / noaudio.c
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 #include "qemu-common.h"
25 #include "audio.h"
26 #include "qemu-timer.h"
27
28 #define AUDIO_CAP "noaudio"
29 #include "audio_int.h"
30
31 typedef struct NoVoiceOut {
32 HWVoiceOut hw;
33 int64_t old_ticks;
34 } NoVoiceOut;
35
36 typedef struct NoVoiceIn {
37 HWVoiceIn hw;
38 int64_t old_ticks;
39 } NoVoiceIn;
40
41 static int no_run_out (HWVoiceOut *hw, int live)
42 {
43 NoVoiceOut *no = (NoVoiceOut *) hw;
44 int decr, samples;
45 int64_t now;
46 int64_t ticks;
47 int64_t bytes;
48
49 now = qemu_get_clock_ns (vm_clock);
50 ticks = now - no->old_ticks;
51 bytes = muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
52 bytes = audio_MIN (bytes, INT_MAX);
53 samples = bytes >> hw->info.shift;
54
55 no->old_ticks = now;
56 decr = audio_MIN (live, samples);
57 hw->rpos = (hw->rpos + decr) % hw->samples;
58 return decr;
59 }
60
61 static int no_write (SWVoiceOut *sw, void *buf, int len)
62 {
63 return audio_pcm_sw_write (sw, buf, len);
64 }
65
66 static int no_init_out (HWVoiceOut *hw, struct audsettings *as)
67 {
68 audio_pcm_init_info (&hw->info, as);
69 hw->samples = 1024;
70 return 0;
71 }
72
73 static void no_fini_out (HWVoiceOut *hw)
74 {
75 (void) hw;
76 }
77
78 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
79 {
80 (void) hw;
81 (void) cmd;
82 return 0;
83 }
84
85 static int no_init_in (HWVoiceIn *hw, struct audsettings *as)
86 {
87 audio_pcm_init_info (&hw->info, as);
88 hw->samples = 1024;
89 return 0;
90 }
91
92 static void no_fini_in (HWVoiceIn *hw)
93 {
94 (void) hw;
95 }
96
97 static int no_run_in (HWVoiceIn *hw)
98 {
99 NoVoiceIn *no = (NoVoiceIn *) hw;
100 int live = audio_pcm_hw_get_live_in (hw);
101 int dead = hw->samples - live;
102 int samples = 0;
103
104 if (dead) {
105 int64_t now = qemu_get_clock_ns (vm_clock);
106 int64_t ticks = now - no->old_ticks;
107 int64_t bytes =
108 muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
109
110 no->old_ticks = now;
111 bytes = audio_MIN (bytes, INT_MAX);
112 samples = bytes >> hw->info.shift;
113 samples = audio_MIN (samples, dead);
114 }
115 return samples;
116 }
117
118 static int no_read (SWVoiceIn *sw, void *buf, int size)
119 {
120 /* use custom code here instead of audio_pcm_sw_read() to avoid
121 * useless resampling/mixing */
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 sw->total_hw_samples_acquired += total;
126 audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
127 return to_clear << sw->info.shift;
128 }
129
130 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
131 {
132 (void) hw;
133 (void) cmd;
134 return 0;
135 }
136
137 static void *no_audio_init (void)
138 {
139 return &no_audio_init;
140 }
141
142 static void no_audio_fini (void *opaque)
143 {
144 (void) opaque;
145 }
146
147 static struct audio_pcm_ops no_pcm_ops = {
148 .init_out = no_init_out,
149 .fini_out = no_fini_out,
150 .run_out = no_run_out,
151 .write = no_write,
152 .ctl_out = no_ctl_out,
153
154 .init_in = no_init_in,
155 .fini_in = no_fini_in,
156 .run_in = no_run_in,
157 .read = no_read,
158 .ctl_in = no_ctl_in
159 };
160
161 struct audio_driver no_audio_driver = {
162 .name = "none",
163 .descr = "Timer based audio emulation",
164 .options = NULL,
165 .init = no_audio_init,
166 .fini = no_audio_fini,
167 .pcm_ops = &no_pcm_ops,
168 .can_be_default = 1,
169 .max_voices_out = INT_MAX,
170 .max_voices_in = INT_MAX,
171 .voice_size_out = sizeof (NoVoiceOut),
172 .voice_size_in = sizeof (NoVoiceIn)
173 };