VirtualBox

source: vbox/trunk/src/VBox/Devices/Audio/noaudio.c@ 23238

最後變更 在這個檔案從23238是 1,由 vboxsync 提交於 55 年 前

import

  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Author Date Id Revision
檔案大小: 4.5 KB
 
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 "Builtins.h"
25#include "../../vl_vbox.h"
26#include "audio.h"
27#include <iprt/alloc.h>
28
29#define AUDIO_CAP "noaudio"
30#include "audio_int.h"
31
32typedef struct NoVoiceOut {
33 HWVoiceOut hw;
34 int64_t old_ticks;
35} NoVoiceOut;
36
37typedef struct NoVoiceIn {
38 HWVoiceIn hw;
39 int64_t old_ticks;
40} NoVoiceIn;
41
42static int no_run_out (HWVoiceOut *hw)
43{
44 NoVoiceOut *no = (NoVoiceOut *) hw;
45 int live, decr, samples;
46 int64_t now;
47 int64_t ticks;
48 int64_t bytes;
49
50 live = audio_pcm_hw_get_live_out (&no->hw);
51 if (!live) {
52 return 0;
53 }
54
55 now = audio_get_clock ();
56 ticks = now - no->old_ticks;
57 bytes = (ticks * hw->info.bytes_per_second) / audio_get_ticks_per_sec ();
58 bytes = audio_MIN (bytes, INT_MAX);
59 samples = bytes >> hw->info.shift;
60
61 no->old_ticks = now;
62 decr = audio_MIN (live, samples);
63 hw->rpos = (hw->rpos + decr) % hw->samples;
64 return decr;
65}
66
67static int no_write (SWVoiceOut *sw, void *buf, int len)
68{
69 return audio_pcm_sw_write (sw, buf, len);
70}
71
72static int no_init_out (HWVoiceOut *hw, audsettings_t *as)
73{
74 audio_pcm_init_info (&hw->info, as);
75 hw->samples = 1024;
76 return 0;
77}
78
79static void no_fini_out (HWVoiceOut *hw)
80{
81 (void) hw;
82}
83
84static int no_ctl_out (HWVoiceOut *hw, int cmd, ...)
85{
86 (void) hw;
87 (void) cmd;
88 return 0;
89}
90
91static int no_init_in (HWVoiceIn *hw, audsettings_t *as)
92{
93 audio_pcm_init_info (&hw->info, as);
94 hw->samples = 1024;
95 return 0;
96}
97
98static void no_fini_in (HWVoiceIn *hw)
99{
100 (void) hw;
101}
102
103static int no_run_in (HWVoiceIn *hw)
104{
105 NoVoiceIn *no = (NoVoiceIn *) hw;
106 int live = audio_pcm_hw_get_live_in (hw);
107 int dead = hw->samples - live;
108 int samples = 0;
109
110 if (dead) {
111 int64_t now = audio_get_clock ();
112 int64_t ticks = now - no->old_ticks;
113 int64_t bytes = (ticks * hw->info.bytes_per_second)
114 / audio_get_ticks_per_sec ();
115
116 no->old_ticks = now;
117 bytes = audio_MIN (bytes, INT_MAX);
118 samples = bytes >> hw->info.shift;
119 samples = audio_MIN (samples, dead);
120 }
121 return samples;
122}
123
124static int no_read (SWVoiceIn *sw, void *buf, int size)
125{
126 int samples = size >> sw->info.shift;
127 int total = sw->hw->total_samples_captured - sw->total_hw_samples_acquired;
128 int to_clear = audio_MIN (samples, total);
129 audio_pcm_info_clear_buf (&sw->info, buf, to_clear);
130 return to_clear;
131}
132
133static int no_ctl_in (HWVoiceIn *hw, int cmd, ...)
134{
135 (void) hw;
136 (void) cmd;
137 return 0;
138}
139
140static void *no_audio_init (void)
141{
142 return &no_audio_driver;
143}
144
145static void no_audio_fini (void *opaque)
146{
147 (void) opaque;
148}
149
150static struct audio_pcm_ops no_pcm_ops = {
151 no_init_out,
152 no_fini_out,
153 no_run_out,
154 no_write,
155 no_ctl_out,
156
157 no_init_in,
158 no_fini_in,
159 no_run_in,
160 no_read,
161 no_ctl_in
162};
163
164struct audio_driver no_audio_driver = {
165 INIT_FIELD (name = ) "null",
166 INIT_FIELD (descr = ) "Timer based audio emulation",
167 INIT_FIELD (options = ) NULL,
168 INIT_FIELD (init = ) no_audio_init,
169 INIT_FIELD (fini = ) no_audio_fini,
170 INIT_FIELD (pcm_ops = ) &no_pcm_ops,
171 INIT_FIELD (can_be_default = ) 1,
172 INIT_FIELD (max_voices_out = ) INT_MAX,
173 INIT_FIELD (max_voices_in = ) INT_MAX,
174 INIT_FIELD (voice_size_out = ) sizeof (NoVoiceOut),
175 INIT_FIELD (voice_size_in = ) sizeof (NoVoiceIn)
176};
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette