block: User BdrvChild callback for device name
[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/osdep.h"
25 #include "qemu-common.h"
26 #include "audio.h"
27 #include "qemu/timer.h"
28
29 #define AUDIO_CAP "noaudio"
30 #include "audio_int.h"
31
32 typedef struct NoVoiceOut {
33 HWVoiceOut hw;
34 int64_t old_ticks;
35 } NoVoiceOut;
36
37 typedef struct NoVoiceIn {
38 HWVoiceIn hw;
39 int64_t old_ticks;
40 } NoVoiceIn;
41
42 static int no_run_out (HWVoiceOut *hw, int live)
43 {
44 NoVoiceOut *no = (NoVoiceOut *) hw;
45 int decr, samples;
46 int64_t now;
47 int64_t ticks;
48 int64_t bytes;
49
50 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
51 ticks = now - no->old_ticks;
52 bytes = muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
53 bytes = audio_MIN(bytes, INT_MAX);
54 samples = bytes >> hw->info.shift;
55
56 no->old_ticks = now;
57 decr = audio_MIN (live, samples);
58 hw->rpos = (hw->rpos + decr) % hw->samples;
59 return decr;
60 }
61
62 static int no_write (SWVoiceOut *sw, void *buf, int len)
63 {
64 return audio_pcm_sw_write(sw, buf, len);
65 }
66
67 static int no_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque)
68 {
69 audio_pcm_init_info (&hw->info, as);
70 hw->samples = 1024;
71 return 0;
72 }
73
74 static void no_fini_out (HWVoiceOut *hw)
75 {
76 (void) hw;
77 }
78
79 static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
80 {
81 (void) hw;
82 (void) cmd;
83 return 0;
84 }
85
86 static int no_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
87 {
88 audio_pcm_init_info (&hw->info, as);
89 hw->samples = 1024;
90 return 0;
91 }
92
93 static void no_fini_in (HWVoiceIn *hw)
94 {
95 (void) hw;
96 }
97
98 static int no_run_in (HWVoiceIn *hw)
99 {
100 NoVoiceIn *no = (NoVoiceIn *) hw;
101 int live = audio_pcm_hw_get_live_in (hw);
102 int dead = hw->samples - live;
103 int samples = 0;
104
105 if (dead) {
106 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
107 int64_t ticks = now - no->old_ticks;
108 int64_t bytes =
109 muldiv64(ticks, hw->info.bytes_per_second, NANOSECONDS_PER_SECOND);
110
111 no->old_ticks = now;
112 bytes = audio_MIN (bytes, INT_MAX);
113 samples = bytes >> hw->info.shift;
114 samples = audio_MIN (samples, dead);
115 }
116 return samples;
117 }
118
119 static int no_read (SWVoiceIn *sw, void *buf, int size)
120 {
121 /* use custom code here instead of audio_pcm_sw_read() to avoid
122 * useless resampling/mixing */
123 int samples = size >> sw->info.shift;
124 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
125 int to_clear = audio_MIN (samples, total);
126 sw->total_hw_samples_acquired += total;
127 audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
128 return to_clear << sw->info.shift;
129 }
130
131 static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
132 {
133 (void) hw;
134 (void) cmd;
135 return 0;
136 }
137
138 static void *no_audio_init (void)
139 {
140 return &no_audio_init;
141 }
142
143 static void no_audio_fini (void *opaque)
144 {
145 (void) opaque;
146 }
147
148 static struct audio_pcm_ops no_pcm_ops = {
149 .init_out = no_init_out,
150 .fini_out = no_fini_out,
151 .run_out = no_run_out,
152 .write = no_write,
153 .ctl_out = no_ctl_out,
154
155 .init_in = no_init_in,
156 .fini_in = no_fini_in,
157 .run_in = no_run_in,
158 .read = no_read,
159 .ctl_in = no_ctl_in
160 };
161
162 struct audio_driver no_audio_driver = {
163 .name = "none",
164 .descr = "Timer based audio emulation",
165 .options = NULL,
166 .init = no_audio_init,
167 .fini = no_audio_fini,
168 .pcm_ops = &no_pcm_ops,
169 .can_be_default = 1,
170 .max_voices_out = INT_MAX,
171 .max_voices_in = INT_MAX,
172 .voice_size_out = sizeof (NoVoiceOut),
173 .voice_size_in = sizeof (NoVoiceIn)
174 };