VirtualBox

source: vbox/trunk/src/VBox/Devices/Audio/DrvHostAudioAlsaStubs.cpp@ 89468

Last change on this file since 89468 was 89427, checked in by vboxsync, 4 years ago

Audio/Stubs: scm fix. [build fix] bugref:9890
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 9.9 KB
Line 
1/* $Id: DrvHostAudioAlsaStubs.cpp 89427 2021-06-01 10:25:50Z vboxsync $ */
2/** @file
3 * Stubs for libasound.
4 */
5
6/*
7 * Copyright (C) 2006-2020 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#define LOG_GROUP LOG_GROUP_DRV_HOST_AUDIO
19#include <iprt/assert.h>
20#include <iprt/err.h>
21#include <iprt/ldr.h>
22#include <VBox/log.h>
23#include <iprt/once.h>
24
25#include <alsa/asoundlib.h>
26#include <errno.h>
27
28#include "DrvHostAudioAlsaStubs.h"
29
30#define VBOX_ALSA_LIB "libasound.so.2"
31
32#define PROXY_STUB(function, rettype, signature, shortsig) \
33 static rettype (*pfn_ ## function) signature; \
34 \
35 extern "C" rettype VBox_##function signature; \
36 rettype VBox_##function signature \
37 { \
38 return pfn_ ## function shortsig; \
39 }
40
41PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
42 (handler))
43PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum))
44
45PROXY_STUB(snd_device_name_hint, int,
46 (int card, const char *iface, void ***hints),
47 (card, iface, hints))
48PROXY_STUB(snd_device_name_free_hint, int,
49 (void **hints),
50 (hints))
51PROXY_STUB(snd_device_name_get_hint, char *,
52 (const void *hint, const char *id),
53 (hint, id))
54
55static int fallback_snd_device_name_hint(int card, const char *iface, void ***hints)
56{
57 RT_NOREF(card, iface);
58 *hints = NULL;
59 return -ENOSYS;
60}
61
62static int fallback_snd_device_name_free_hint(void **hints)
63{
64 RT_NOREF(hints);
65 return 0;
66}
67
68static char *fallback_snd_device_name_get_hint(const void *hint, const char *id)
69{
70 RT_NOREF(hint, id);
71 return NULL;
72}
73
74/*
75 * PCM
76 */
77
78PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm), (pcm))
79PROXY_STUB(snd_pcm_avail_delay, int,
80 (snd_pcm_t *pcm, snd_pcm_sframes_t *availp, snd_pcm_sframes_t *delayp),
81 (pcm, availp, delayp))
82PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm))
83PROXY_STUB(snd_pcm_delay, int, (snd_pcm_t *pcm, snd_pcm_sframes_t *delayp), (pcm, delayp))
84PROXY_STUB(snd_pcm_nonblock, int, (snd_pcm_t *pcm, int *onoff),
85 (pcm, onoff))
86PROXY_STUB(snd_pcm_drain, int, (snd_pcm_t *pcm),
87 (pcm))
88PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm))
89PROXY_STUB(snd_pcm_open, int,
90 (snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
91 (pcm, name, stream, mode))
92PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm))
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_pcm_resume, int, (snd_pcm_t *pcm), (pcm))
97PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
98PROXY_STUB(snd_pcm_state_name, const char *, (snd_pcm_state_t state), (state))
99PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
100 (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
101 (pcm, buffer, size))
102PROXY_STUB(snd_pcm_start, int, (snd_pcm_t *pcm), (pcm))
103
104static int fallback_snd_pcm_avail_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *availp, snd_pcm_sframes_t *delayp)
105{
106 *availp = pfn_snd_pcm_avail_update(pcm);
107 int ret = pfn_snd_pcm_delay(pcm, delayp);
108 if (ret >= 0 && *availp < 0)
109 ret = (int)*availp;
110 return ret;
111}
112
113/*
114 * HW
115 */
116
117PROXY_STUB(snd_pcm_hw_params, int,
118 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
119 (pcm, params))
120PROXY_STUB(snd_pcm_hw_params_any, int,
121 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
122 (pcm, params))
123PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
124 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
125 (params, val))
126PROXY_STUB(snd_pcm_hw_params_get_buffer_size_min, int,
127 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
128 (params, val))
129PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
130 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
131 (params, frames, dir))
132PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
133 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
134 (params, frames, dir))
135PROXY_STUB(snd_pcm_hw_params_set_rate_near, int,
136 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
137 (pcm, params, val, dir))
138PROXY_STUB(snd_pcm_hw_params_set_access, int,
139 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access),
140 (pcm, params, _access))
141PROXY_STUB(snd_pcm_hw_params_set_buffer_time_near, int,
142 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
143 (pcm, params, val, dir))
144PROXY_STUB(snd_pcm_hw_params_set_buffer_size_near, int,
145 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
146 (pcm, params, val))
147PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
148 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
149 (pcm, params, val))
150PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
151 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
152 (pcm, params, val, dir))
153PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
154 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
155 (pcm, params, val, dir))
156PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
157PROXY_STUB(snd_pcm_hw_params_set_format, int,
158 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val),
159 (pcm, params, val))
160
161/*
162 * SW
163 */
164
165PROXY_STUB(snd_pcm_sw_params, int,
166 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
167 (pcm, params))
168PROXY_STUB(snd_pcm_sw_params_current, int,
169 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
170 (pcm, params))
171PROXY_STUB(snd_pcm_sw_params_get_start_threshold, int,
172 (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val),
173 (params, val))
174PROXY_STUB(snd_pcm_sw_params_set_avail_min, int,
175 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
176 (pcm, params, val))
177PROXY_STUB(snd_pcm_sw_params_set_start_threshold, int,
178 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
179 (pcm, params, val))
180PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
181
182typedef struct
183{
184 const char *name;
185 void (**pfn)(void);
186 void (*pfnFallback)(void);
187} SHARED_FUNC;
188
189#define ELEMENT(function) { #function , (void (**)(void)) & pfn_ ## function, NULL }
190#define ELEMENT_FALLBACK(function) { #function , (void (**)(void)) & pfn_ ## function, (void (*)(void))fallback_ ## function }
191static SHARED_FUNC SharedFuncs[] =
192{
193 ELEMENT(snd_lib_error_set_handler),
194 ELEMENT(snd_strerror),
195
196 ELEMENT_FALLBACK(snd_device_name_hint),
197 ELEMENT_FALLBACK(snd_device_name_get_hint),
198 ELEMENT_FALLBACK(snd_device_name_free_hint),
199
200 ELEMENT(snd_pcm_avail_update),
201 ELEMENT_FALLBACK(snd_pcm_avail_delay),
202 ELEMENT(snd_pcm_close),
203 ELEMENT(snd_pcm_delay),
204 ELEMENT(snd_pcm_drain),
205 ELEMENT(snd_pcm_drop),
206 ELEMENT(snd_pcm_nonblock),
207 ELEMENT(snd_pcm_open),
208 ELEMENT(snd_pcm_prepare),
209 ELEMENT(snd_pcm_resume),
210 ELEMENT(snd_pcm_state),
211 ELEMENT(snd_pcm_state_name),
212
213 ELEMENT(snd_pcm_readi),
214 ELEMENT(snd_pcm_start),
215 ELEMENT(snd_pcm_writei),
216
217 ELEMENT(snd_pcm_hw_params),
218 ELEMENT(snd_pcm_hw_params_any),
219 ELEMENT(snd_pcm_hw_params_sizeof),
220 ELEMENT(snd_pcm_hw_params_get_buffer_size),
221 ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
222 ELEMENT(snd_pcm_hw_params_get_period_size_min),
223 ELEMENT(snd_pcm_hw_params_set_access),
224 ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
225 ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
226 ELEMENT(snd_pcm_hw_params_set_channels_near),
227 ELEMENT(snd_pcm_hw_params_set_format),
228 ELEMENT(snd_pcm_hw_params_get_period_size),
229 ELEMENT(snd_pcm_hw_params_set_period_size_near),
230 ELEMENT(snd_pcm_hw_params_set_period_time_near),
231 ELEMENT(snd_pcm_hw_params_set_rate_near),
232
233 ELEMENT(snd_pcm_sw_params),
234 ELEMENT(snd_pcm_sw_params_current),
235 ELEMENT(snd_pcm_sw_params_get_start_threshold),
236 ELEMENT(snd_pcm_sw_params_set_avail_min),
237 ELEMENT(snd_pcm_sw_params_set_start_threshold),
238 ELEMENT(snd_pcm_sw_params_sizeof),
239};
240#undef ELEMENT
241
242/** Init once. */
243static RTONCE g_AlsaLibInitOnce = RTONCE_INITIALIZER;
244
245
246/** @callback_method_impl{FNRTONCE} */
247static DECLCALLBACK(int32_t) drvHostAudioAlsaLibInitOnce(void *pvUser)
248{
249 RT_NOREF(pvUser);
250 LogFlowFunc(("\n"));
251
252 RTLDRMOD hMod = NIL_RTLDRMOD;
253 int rc = RTLdrLoadSystemEx(VBOX_ALSA_LIB, RTLDRLOAD_FLAGS_NO_UNLOAD, &hMod);
254 if (RT_SUCCESS(rc))
255 {
256 for (uintptr_t i = 0; i < RT_ELEMENTS(SharedFuncs); i++)
257 {
258 rc = RTLdrGetSymbol(hMod, SharedFuncs[i].name, (void **)SharedFuncs[i].pfn);
259 if (RT_SUCCESS(rc))
260 { /* likely */ }
261 else if (SharedFuncs[i].pfnFallback && rc == VERR_SYMBOL_NOT_FOUND)
262 *SharedFuncs[i].pfn = SharedFuncs[i].pfnFallback;
263 else
264 {
265 LogRelFunc(("Failed to load library %s: Getting symbol %s failed: %Rrc\n", VBOX_ALSA_LIB, SharedFuncs[i].name, rc));
266 return rc;
267 }
268 }
269 }
270 else
271 LogRelFunc(("Failed to load library %s (%Rrc)\n", VBOX_ALSA_LIB, rc));
272 return rc;
273}
274
275
276/**
277 * Try to dynamically load the ALSA libraries.
278 *
279 * @returns VBox status code.
280 */
281int audioLoadAlsaLib(void)
282{
283 LogFlowFunc(("\n"));
284 return RTOnce(&g_AlsaLibInitOnce, drvHostAudioAlsaLibInitOnce, NULL);
285}
286
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