@samitouri / QOSamiQemu
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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
25 #include "qemu/osdep.h"
26 #include "qemu/module.h"
27 #include "qemu/audio.h"
28 #include "qom/object.h"
29
30 #include "audio_int.h"
31
32 #define TYPE_AUDIO_NONE "audio-none"
33 OBJECT_DECLARE_SIMPLE_TYPE(AudioNone, AUDIO_NONE)
34
35 struct AudioNone {
36 AudioMixengBackend parent_obj;
37 };
38
39 typedef struct NoVoiceOut {
40 HWVoiceOut hw;
41 RateCtl rate;
42 } NoVoiceOut;
43
44 typedef struct NoVoiceIn {
45 HWVoiceIn hw;
46 RateCtl rate;
47 } NoVoiceIn;
48
49 static size_t no_write(HWVoiceOut *hw, void *buf, size_t len)
50 {
51 NoVoiceOut *no = (NoVoiceOut *) hw;
52 return audio_rate_get_bytes(&no->rate, &hw->info, len);
53 }
54
55 static int no_init_out(HWVoiceOut *hw, struct audsettings *as)
56 {
57 NoVoiceOut *no = (NoVoiceOut *) hw;
58
59 audio_pcm_init_info (&hw->info, as);
60 hw->samples = 1024;
61 audio_rate_start(&no->rate);
62 return 0;
63 }
64
65 static void no_fini_out (HWVoiceOut *hw)
66 {
67 (void) hw;
68 }
69
70 static void no_enable_out(HWVoiceOut *hw, bool enable)
71 {
72 NoVoiceOut *no = (NoVoiceOut *) hw;
73
74 if (enable) {
75 audio_rate_start(&no->rate);
76 }
77 }
78
79 static int no_init_in(HWVoiceIn *hw, struct audsettings *as)
80 {
81 NoVoiceIn *no = (NoVoiceIn *) hw;
82
83 audio_pcm_init_info (&hw->info, as);
84 hw->samples = 1024;
85 audio_rate_start(&no->rate);
86 return 0;
87 }
88
89 static void no_fini_in (HWVoiceIn *hw)
90 {
91 (void) hw;
92 }
93
94 static size_t no_read(HWVoiceIn *hw, void *buf, size_t size)
95 {
96 NoVoiceIn *no = (NoVoiceIn *) hw;
97 int64_t bytes = audio_rate_get_bytes(&no->rate, &hw->info, size);
98
99 audio_pcm_info_clear_buf(&hw->info, buf, bytes / hw->info.bytes_per_frame);
100 return bytes;
101 }
102
103 static void no_enable_in(HWVoiceIn *hw, bool enable)
104 {
105 NoVoiceIn *no = (NoVoiceIn *) hw;
106
107 if (enable) {
108 audio_rate_start(&no->rate);
109 }
110 }
111
112 static void audio_none_class_init(ObjectClass *klass, const void *data)
113 {
114 AudioMixengBackendClass *k = AUDIO_MIXENG_BACKEND_CLASS(klass);
115
116 k->max_voices_out = INT_MAX;
117 k->max_voices_in = INT_MAX;
118 k->voice_size_out = sizeof(NoVoiceOut);
119 k->voice_size_in = sizeof(NoVoiceIn);
120
121 k->init_out = no_init_out;
122 k->fini_out = no_fini_out;
123 k->write = no_write;
124 k->buffer_get_free = audio_generic_buffer_get_free;
125 k->run_buffer_out = audio_generic_run_buffer_out;
126 k->enable_out = no_enable_out;
127
128 k->init_in = no_init_in;
129 k->fini_in = no_fini_in;
130 k->read = no_read;
131 k->run_buffer_in = audio_generic_run_buffer_in;
132 k->enable_in = no_enable_in;
133 }
134
135 static const TypeInfo audio_types[] = {
136 {
137 .name = TYPE_AUDIO_NONE,
138 .parent = TYPE_AUDIO_MIXENG_BACKEND,
139 .instance_size = sizeof(AudioNone),
140 .class_init = audio_none_class_init,
141 },
142 };
143
144 DEFINE_TYPES(audio_types)
145 module_obj(TYPE_AUDIO_NONE);