VirtualBox

source: vbox/trunk/src/VBox/Devices/Audio/alsa_stubs.c@ 73160

最後變更 在這個檔案從73160是 73160,由 vboxsync 提交於 7 年 前

Audio/ALSA: Added stubs for snd_pcm_delay(), snd_pcm_drain() and snd_pcm_nonblock().
  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Author Date Id Revision
檔案大小: 8.2 KB
行 
1/* $Id: alsa_stubs.c 73160 2018-07-16 16:08:09Z vboxsync $ */
2/** @file
3 * Stubs for libasound.
4 */
5
6/*
7 * Copyright (C) 2006-2018 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.alldomusa.eu.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17#define LOG_GROUP LOG_GROUP_DRV_HOST_AUDIO
18#include <iprt/assert.h>
19#include <iprt/ldr.h>
20#include <VBox/log.h>
21#include <VBox/err.h>
22
23#include <alsa/asoundlib.h>
24
25#include "alsa_stubs.h"
26
27#define VBOX_ALSA_LIB "libasound.so.2"
28
29#define PROXY_STUB(function, rettype, signature, shortsig) \
30 static rettype (*pfn_ ## function) signature; \
31 \
32 rettype VBox_##function signature; \
33 rettype VBox_##function signature \
34 { \
35 return pfn_ ## function shortsig; \
36 }
37
38PROXY_STUB(snd_device_name_hint, int,
39 (int card, const char *iface, void ***hints),
40 (card, iface, hints))
41PROXY_STUB(snd_device_name_free_hint, int,
42 (void **hints),
43 (hints))
44PROXY_STUB(snd_device_name_get_hint, char *,
45 (const void *hint, const char *id),
46 (hint, id))
47
48PROXY_STUB(snd_pcm_hw_params_any, int,
49 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
50 (pcm, params))
51PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm))
52PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm),
53 (pcm))
54PROXY_STUB(snd_pcm_nonblock, int, (snd_pcm_t *pcm, int *onoff),
55 (pcm, onoff))
56PROXY_STUB(snd_pcm_delay, int, (snd_pcm_t *pcm, snd_pcm_sframes_t *frames),
57 (pcm, frames))
58PROXY_STUB(snd_pcm_drain, int, (snd_pcm_t *pcm),
59 (pcm))
60PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
61 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
62 (pcm, params, val))
63PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
64 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
65 (pcm, params, val, dir))
66PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm))
67PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
68PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
69 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
70 (pcm, params, val, dir))
71PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
72 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
73 (params, frames, dir))
74PROXY_STUB(snd_pcm_hw_params, int,
75 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
76 (pcm, params))
77PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
78PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
79PROXY_STUB(snd_pcm_open, int,
80 (snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
81 (pcm, name, stream, mode))
82PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
83 (handler))
84PROXY_STUB(snd_pcm_sw_params, int,
85 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
86 (pcm, params))
87PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
88 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
89 (params, frames, dir))
90PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
91 (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
92 (pcm, buffer, size))
93PROXY_STUB(snd_pcm_readi, snd_pcm_sframes_t,
94 (snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size),
95 (pcm, buffer, size))
96PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum))
97PROXY_STUB(snd_pcm_start, int, (snd_pcm_t *pcm), (pcm))
98PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm))
99PROXY_STUB(snd_pcm_resume, int, (snd_pcm_t *pcm), (pcm))
100PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
101 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
102 (params, val))
103PROXY_STUB(snd_pcm_hw_params_set_rate_near, int,
104 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
105 (pcm, params, val, dir))
106PROXY_STUB(snd_pcm_hw_params_set_access, int,
107 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access),
108 (pcm, params, _access))
109PROXY_STUB(snd_pcm_hw_params_set_buffer_time_near, int,
110 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
111 (pcm, params, val, dir))
112PROXY_STUB(snd_pcm_hw_params_set_buffer_size_near, int,
113 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
114 (pcm, params, val))
115PROXY_STUB(snd_pcm_hw_params_get_buffer_size_min, int,
116 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
117 (params, val))
118PROXY_STUB(snd_pcm_hw_params_set_format, int,
119 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val),
120 (pcm, params, val))
121PROXY_STUB(snd_pcm_sw_params_current, int,
122 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
123 (pcm, params))
124PROXY_STUB(snd_pcm_sw_params_set_start_threshold, int,
125 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
126 (pcm, params, val))
127PROXY_STUB(snd_pcm_sw_params_set_avail_min, int,
128 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
129 (pcm, params, val))
130
131typedef struct
132{
133 const char *name;
134 void (**fn)(void);
135} SHARED_FUNC;
136
137#define ELEMENT(function) { #function , (void (**)(void)) & pfn_ ## function }
138static SHARED_FUNC SharedFuncs[] =
139{
140 ELEMENT(snd_device_name_hint),
141 ELEMENT(snd_device_name_get_hint),
142 ELEMENT(snd_device_name_free_hint),
143
144 ELEMENT(snd_pcm_hw_params_any),
145 ELEMENT(snd_pcm_close),
146 ELEMENT(snd_pcm_delay),
147 ELEMENT(snd_pcm_drain),
148 ELEMENT(snd_pcm_avail_update),
149 ELEMENT(snd_pcm_nonblock),
150 ELEMENT(snd_pcm_hw_params_set_channels_near),
151 ELEMENT(snd_pcm_hw_params_set_period_time_near),
152 ELEMENT(snd_pcm_prepare),
153 ELEMENT(snd_pcm_sw_params_sizeof),
154 ELEMENT(snd_pcm_hw_params_set_period_size_near),
155 ELEMENT(snd_pcm_hw_params_get_period_size),
156 ELEMENT(snd_pcm_hw_params),
157 ELEMENT(snd_pcm_hw_params_sizeof),
158 ELEMENT(snd_pcm_state),
159 ELEMENT(snd_pcm_open),
160 ELEMENT(snd_lib_error_set_handler),
161 ELEMENT(snd_pcm_sw_params),
162 ELEMENT(snd_pcm_hw_params_get_period_size_min),
163 ELEMENT(snd_pcm_writei),
164 ELEMENT(snd_pcm_readi),
165 ELEMENT(snd_strerror),
166 ELEMENT(snd_pcm_start),
167 ELEMENT(snd_pcm_drop),
168 ELEMENT(snd_pcm_resume),
169 ELEMENT(snd_pcm_hw_params_get_buffer_size),
170 ELEMENT(snd_pcm_hw_params_set_rate_near),
171 ELEMENT(snd_pcm_hw_params_set_access),
172 ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
173 ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
174 ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
175 ELEMENT(snd_pcm_hw_params_set_format),
176 ELEMENT(snd_pcm_sw_params_current),
177 ELEMENT(snd_pcm_sw_params_set_start_threshold),
178 ELEMENT(snd_pcm_sw_params_set_avail_min)
179};
180#undef ELEMENT
181
182/**
183 * Try to dynamically load the ALSA libraries. This function is not
184 * thread-safe, and should be called before attempting to use any of the
185 * ALSA functions.
186 *
187 * @returns iprt status code
188 */
189int audioLoadAlsaLib(void)
190{
191 int rc = VINF_SUCCESS;
192 unsigned i;
193 static enum { NO = 0, YES, FAIL } isLibLoaded = NO;
194 RTLDRMOD hLib;
195
196 LogFlowFunc(("\n"));
197 /* If this is not NO then the function has obviously been called twice,
198 which is likely to be a bug. */
199 if (NO != isLibLoaded)
200 {
201 AssertMsgFailed(("isLibLoaded == %s\n", YES == isLibLoaded ? "YES" : "NO"));
202 return YES == isLibLoaded ? VINF_SUCCESS : VERR_NOT_SUPPORTED;
203 }
204 isLibLoaded = FAIL;
205 rc = RTLdrLoad(VBOX_ALSA_LIB, &hLib);
206 if (RT_FAILURE(rc))
207 {
208 LogRelFunc(("Failed to load library %s\n", VBOX_ALSA_LIB));
209 return rc;
210 }
211 for (i=0; i<RT_ELEMENTS(SharedFuncs); i++)
212 {
213 rc = RTLdrGetSymbol(hLib, SharedFuncs[i].name, (void**)SharedFuncs[i].fn);
214 if (RT_FAILURE(rc))
215 return rc;
216 }
217 isLibLoaded = YES;
218 return rc;
219}
220
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