VirtualBox

source: vbox/trunk/src/VBox/Devices/Audio/alsa_stubs.c@ 34906

Last change on this file since 34906 was 34451, checked in by vboxsync, 14 years ago

Devices/Audio/Alsa: incorporated upstream fix to properly resume a stream suspend which can be necessary after the host was suspended
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 7.1 KB
Line 
1/* $Id: alsa_stubs.c 34451 2010-11-29 11:00:53Z vboxsync $ */
2/** @file
3 * Stubs for libasound.
4 */
5
6/*
7 * Copyright (C) 2006-2010 Oracle Corporation
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
18#include <iprt/assert.h>
19#include <iprt/ldr.h>
20#define LOG_GROUP LOG_GROUP_DEV_AUDIO
21#include <VBox/log.h>
22#include <VBox/err.h>
23
24#include <alsa/asoundlib.h>
25
26#include "alsa_stubs.h"
27
28#define VBOX_ALSA_LIB "libasound.so.2"
29
30#define PROXY_STUB(function, rettype, signature, shortsig) \
31 static rettype (*pfn_ ## function) signature; \
32 \
33 rettype function signature \
34 { \
35 return pfn_ ## function shortsig; \
36 }
37
38PROXY_STUB(snd_pcm_hw_params_any, int,
39 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
40 (pcm, params))
41PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm))
42PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm),
43 (pcm))
44PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
45 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
46 (pcm, params, val))
47PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
48 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
49 (pcm, params, val, dir))
50PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm))
51PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
52PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
53 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
54 (pcm, params, val, dir))
55PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
56 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
57 (params, frames, dir))
58PROXY_STUB(snd_pcm_hw_params, int,
59 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
60 (pcm, params))
61PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
62PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
63PROXY_STUB(snd_pcm_open, int,
64 (snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
65 (pcm, name, stream, mode))
66PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
67 (handler))
68PROXY_STUB(snd_pcm_sw_params, int,
69 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
70 (pcm, params))
71PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
72 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
73 (params, frames, dir))
74PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
75 (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
76 (pcm, buffer, size))
77PROXY_STUB(snd_pcm_readi, snd_pcm_sframes_t,
78 (snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size),
79 (pcm, buffer, size))
80PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum))
81PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm))
82PROXY_STUB(snd_pcm_resume, 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(function) { #function , (void (**)(void)) & pfn_ ## function }
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_resume),
141 ELEMENT(snd_pcm_hw_params_get_buffer_size),
142 ELEMENT(snd_pcm_hw_params_set_rate_near),
143 ELEMENT(snd_pcm_hw_params_set_access),
144 ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
145 ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
146 ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
147 ELEMENT(snd_pcm_hw_params_set_format),
148 ELEMENT(snd_pcm_sw_params_current),
149 ELEMENT(snd_pcm_sw_params_set_start_threshold),
150};
151#undef ELEMENT
152
153/**
154 * Try to dynamically load the ALSA libraries. This function is not
155 * thread-safe, and should be called before attempting to use any of the
156 * ALSA functions.
157 *
158 * @returns iprt status code
159 */
160int audioLoadAlsaLib(void)
161{
162 int rc = VINF_SUCCESS;
163 unsigned i;
164 static enum { NO = 0, YES, FAIL } isLibLoaded = NO;
165 RTLDRMOD hLib;
166
167 LogFlowFunc(("\n"));
168 /* If this is not NO then the function has obviously been called twice,
169 which is likely to be a bug. */
170 if (NO != isLibLoaded)
171 {
172 AssertMsgFailed(("isLibLoaded == %s\n", YES == isLibLoaded ? "YES" : "NO"));
173 return YES == isLibLoaded ? VINF_SUCCESS : VERR_NOT_SUPPORTED;
174 }
175 isLibLoaded = FAIL;
176 rc = RTLdrLoad(VBOX_ALSA_LIB, &hLib);
177 if (RT_FAILURE(rc))
178 {
179 LogRelFunc(("Failed to load library %s\n", VBOX_ALSA_LIB));
180 return rc;
181 }
182 for (i=0; i<RT_ELEMENTS(SharedFuncs); i++)
183 {
184 rc = RTLdrGetSymbol(hLib, SharedFuncs[i].name, (void**)SharedFuncs[i].fn);
185 if (RT_FAILURE(rc))
186 return rc;
187 }
188 isLibLoaded = YES;
189 return rc;
190}
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