VirtualBox

source: vbox/trunk/src/VBox/Devices/Audio/alsa_stubs.c@ 11444

Last change on this file since 11444 was 11268, checked in by vboxsync, 16 years ago

Devices: ELEMENTS -> RT_ELEMENTS.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 7.2 KB
Line 
1/** @file
2 *
3 * Stubs for libasound.
4 */
5
6/*
7 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18 * Clara, CA 95054 USA or visit http://www.sun.com if you need
19 * additional information or have any questions.
20 */
21
22#include <iprt/assert.h>
23#include <iprt/ldr.h>
24#define LOG_GROUP LOG_GROUP_DEV_AUDIO
25#include <VBox/log.h>
26#include <VBox/err.h>
27
28#include <alsa/asoundlib.h>
29
30#include "alsa_stubs.h"
31
32#define VBOX_ALSA_LIB "libasound.so.2"
33
34#define PROXY_STUB(function, rettype, signature, shortsig) \
35void (*function ## _fn)(void); \
36rettype function signature \
37{ return ( (rettype (*) signature) function ## _fn ) shortsig; }
38
39PROXY_STUB(snd_pcm_hw_params_any, int,
40 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
41 (pcm, params))
42PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm))
43PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm),
44 (pcm))
45PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
46 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
47 (pcm, params, val))
48PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
49 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
50 (pcm, params, val, dir))
51PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm))
52PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
53PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
54 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
55 (pcm, params, val, dir))
56PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
57 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
58 (params, frames, dir))
59PROXY_STUB(snd_pcm_hw_params, int,
60 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
61 (pcm, params))
62PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
63PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
64PROXY_STUB(snd_pcm_open, int,
65 (snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
66 (pcm, name, stream, mode))
67PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
68 (handler))
69PROXY_STUB(snd_pcm_sw_params, int,
70 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
71 (pcm, params))
72PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
73 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
74 (params, frames, dir))
75PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
76 (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
77 (pcm, buffer, size))
78PROXY_STUB(snd_pcm_readi, snd_pcm_sframes_t,
79 (snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size),
80 (pcm, buffer, size))
81PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum))
82PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm))
83PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
84 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
85 (params, val))
86PROXY_STUB(snd_pcm_hw_params_set_rate_near, int,
87 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
88 (pcm, params, val, dir))
89PROXY_STUB(snd_pcm_hw_params_set_access, int,
90 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access),
91 (pcm, params, _access))
92PROXY_STUB(snd_pcm_hw_params_set_buffer_time_near, int,
93 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
94 (pcm, params, val, dir))
95PROXY_STUB(snd_pcm_hw_params_set_buffer_size_near, int,
96 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
97 (pcm, params, val))
98PROXY_STUB(snd_pcm_hw_params_get_buffer_size_min, int,
99 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
100 (params, val))
101PROXY_STUB(snd_pcm_hw_params_set_format, int,
102 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val),
103 (pcm, params, val))
104PROXY_STUB(snd_pcm_sw_params_current, int,
105 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
106 (pcm, params))
107PROXY_STUB(snd_pcm_sw_params_set_start_threshold, int,
108 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
109 (pcm, params, val))
110
111typedef struct
112{
113 const char *name;
114 void (**fn)(void);
115} SHARED_FUNC;
116
117#define ELEMENT(s) { #s , & s ## _fn }
118static SHARED_FUNC SharedFuncs[] =
119{
120 ELEMENT(snd_pcm_hw_params_any),
121 ELEMENT(snd_pcm_close),
122 ELEMENT(snd_pcm_avail_update),
123 ELEMENT(snd_pcm_hw_params_set_channels_near),
124 ELEMENT(snd_pcm_hw_params_set_period_time_near),
125 ELEMENT(snd_pcm_prepare),
126 ELEMENT(snd_pcm_sw_params_sizeof),
127 ELEMENT(snd_pcm_hw_params_set_period_size_near),
128 ELEMENT(snd_pcm_hw_params_get_period_size),
129 ELEMENT(snd_pcm_hw_params),
130 ELEMENT(snd_pcm_hw_params_sizeof),
131 ELEMENT(snd_pcm_state),
132 ELEMENT(snd_pcm_open),
133 ELEMENT(snd_lib_error_set_handler),
134 ELEMENT(snd_pcm_sw_params),
135 ELEMENT(snd_pcm_hw_params_get_period_size_min),
136 ELEMENT(snd_pcm_writei),
137 ELEMENT(snd_pcm_readi),
138 ELEMENT(snd_strerror),
139 ELEMENT(snd_pcm_drop),
140 ELEMENT(snd_pcm_hw_params_get_buffer_size),
141 ELEMENT(snd_pcm_hw_params_set_rate_near),
142 ELEMENT(snd_pcm_hw_params_set_access),
143 ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
144 ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
145 ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
146 ELEMENT(snd_pcm_hw_params_set_format),
147 ELEMENT(snd_pcm_sw_params_current),
148 ELEMENT(snd_pcm_sw_params_set_start_threshold),
149};
150#undef ELEMENT
151
152/**
153 * Try to dynamically load the ALSA libraries. This function is not
154 * thread-safe, and should be called before attempting to use any of the
155 * ALSA functions.
156 *
157 * @returns iprt status code
158 */
159int audioLoadAlsaLib(void)
160{
161 int rc = VINF_SUCCESS;
162 int i;
163 static enum { NO = 0, YES, FAIL } isLibLoaded = NO;
164 RTLDRMOD hLib;
165
166 LogFlowFunc(("\n"));
167 /* If this is not NO then the function has obviously been called twice,
168 which is likely to be a bug. */
169 if (NO != isLibLoaded)
170 {
171 AssertMsgFailed(("isLibLoaded == %s\n", YES == isLibLoaded ? "YES" : "NO"));
172 return YES == isLibLoaded ? VINF_SUCCESS : VERR_NOT_SUPPORTED;
173 }
174 isLibLoaded = FAIL;
175 rc = RTLdrLoad(VBOX_ALSA_LIB, &hLib);
176 if (RT_FAILURE(rc))
177 {
178 LogRelFunc(("Failed to load library %s\n", VBOX_ALSA_LIB));
179 return rc;
180 }
181 for (i=0; i<RT_ELEMENTS(SharedFuncs); i++)
182 {
183 rc = RTLdrGetSymbol(hLib, SharedFuncs[i].name, (void**)SharedFuncs[i].fn);
184 if (RT_FAILURE(rc))
185 return rc;
186 }
187 isLibLoaded = YES;
188 return rc;
189}
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