VirtualBox

source: vbox/trunk/src/VBox/Devices/Audio/DrvHostAudioAlsaStubs.cpp@ 90778

Last change on this file since 90778 was 89471, checked in by vboxsync, 3 years ago

DrvHostAudioAlsa: Use snd_pcm_set_chmap to identify the channels we're outputting. bugref:9890
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  • Property svn:keywords set to Author Date Id Revision
File size: 10.1 KB
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1/* $Id: DrvHostAudioAlsaStubs.cpp 89471 2021-06-02 20:53:43Z 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_set_chmap, int, (snd_pcm_t *pcm, snd_pcm_chmap_t const *map), (pcm, map))
98PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
99PROXY_STUB(snd_pcm_state_name, const char *, (snd_pcm_state_t state), (state))
100PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
101 (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
102 (pcm, buffer, size))
103PROXY_STUB(snd_pcm_start, int, (snd_pcm_t *pcm), (pcm))
104
105static int fallback_snd_pcm_avail_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *availp, snd_pcm_sframes_t *delayp)
106{
107 *availp = pfn_snd_pcm_avail_update(pcm);
108 int ret = pfn_snd_pcm_delay(pcm, delayp);
109 if (ret >= 0 && *availp < 0)
110 ret = (int)*availp;
111 return ret;
112}
113
114static int fallback_snd_pcm_set_chmap(snd_pcm_t *pcm, snd_pcm_chmap_t const *map)
115{
116 RT_NOREF(pcm, map);
117 return 0;
118}
119
120/*
121 * HW
122 */
123
124PROXY_STUB(snd_pcm_hw_params, int,
125 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
126 (pcm, params))
127PROXY_STUB(snd_pcm_hw_params_any, int,
128 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
129 (pcm, params))
130PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
131 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
132 (params, val))
133PROXY_STUB(snd_pcm_hw_params_get_buffer_size_min, int,
134 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
135 (params, val))
136PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
137 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
138 (params, frames, dir))
139PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
140 (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
141 (params, frames, dir))
142PROXY_STUB(snd_pcm_hw_params_set_rate_near, int,
143 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
144 (pcm, params, val, dir))
145PROXY_STUB(snd_pcm_hw_params_set_access, int,
146 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access),
147 (pcm, params, _access))
148PROXY_STUB(snd_pcm_hw_params_set_buffer_time_near, int,
149 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
150 (pcm, params, val, dir))
151PROXY_STUB(snd_pcm_hw_params_set_buffer_size_near, int,
152 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
153 (pcm, params, val))
154PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
155 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
156 (pcm, params, val))
157PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
158 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
159 (pcm, params, val, dir))
160PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
161 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
162 (pcm, params, val, dir))
163PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
164PROXY_STUB(snd_pcm_hw_params_set_format, int,
165 (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val),
166 (pcm, params, val))
167
168/*
169 * SW
170 */
171
172PROXY_STUB(snd_pcm_sw_params, int,
173 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
174 (pcm, params))
175PROXY_STUB(snd_pcm_sw_params_current, int,
176 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
177 (pcm, params))
178PROXY_STUB(snd_pcm_sw_params_get_start_threshold, int,
179 (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val),
180 (params, val))
181PROXY_STUB(snd_pcm_sw_params_set_avail_min, int,
182 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
183 (pcm, params, val))
184PROXY_STUB(snd_pcm_sw_params_set_start_threshold, int,
185 (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
186 (pcm, params, val))
187PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
188
189typedef struct
190{
191 const char *name;
192 void (**pfn)(void);
193 void (*pfnFallback)(void);
194} SHARED_FUNC;
195
196#define ELEMENT(function) { #function , (void (**)(void)) & pfn_ ## function, NULL }
197#define ELEMENT_FALLBACK(function) { #function , (void (**)(void)) & pfn_ ## function, (void (*)(void))fallback_ ## function }
198static SHARED_FUNC SharedFuncs[] =
199{
200 ELEMENT(snd_lib_error_set_handler),
201 ELEMENT(snd_strerror),
202
203 ELEMENT_FALLBACK(snd_device_name_hint),
204 ELEMENT_FALLBACK(snd_device_name_get_hint),
205 ELEMENT_FALLBACK(snd_device_name_free_hint),
206
207 ELEMENT(snd_pcm_avail_update),
208 ELEMENT_FALLBACK(snd_pcm_avail_delay),
209 ELEMENT(snd_pcm_close),
210 ELEMENT(snd_pcm_delay),
211 ELEMENT(snd_pcm_drain),
212 ELEMENT(snd_pcm_drop),
213 ELEMENT(snd_pcm_nonblock),
214 ELEMENT(snd_pcm_open),
215 ELEMENT(snd_pcm_prepare),
216 ELEMENT(snd_pcm_resume),
217 ELEMENT_FALLBACK(snd_pcm_set_chmap),
218 ELEMENT(snd_pcm_state),
219 ELEMENT(snd_pcm_state_name),
220
221 ELEMENT(snd_pcm_readi),
222 ELEMENT(snd_pcm_start),
223 ELEMENT(snd_pcm_writei),
224
225 ELEMENT(snd_pcm_hw_params),
226 ELEMENT(snd_pcm_hw_params_any),
227 ELEMENT(snd_pcm_hw_params_sizeof),
228 ELEMENT(snd_pcm_hw_params_get_buffer_size),
229 ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
230 ELEMENT(snd_pcm_hw_params_get_period_size_min),
231 ELEMENT(snd_pcm_hw_params_set_access),
232 ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
233 ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
234 ELEMENT(snd_pcm_hw_params_set_channels_near),
235 ELEMENT(snd_pcm_hw_params_set_format),
236 ELEMENT(snd_pcm_hw_params_get_period_size),
237 ELEMENT(snd_pcm_hw_params_set_period_size_near),
238 ELEMENT(snd_pcm_hw_params_set_period_time_near),
239 ELEMENT(snd_pcm_hw_params_set_rate_near),
240
241 ELEMENT(snd_pcm_sw_params),
242 ELEMENT(snd_pcm_sw_params_current),
243 ELEMENT(snd_pcm_sw_params_get_start_threshold),
244 ELEMENT(snd_pcm_sw_params_set_avail_min),
245 ELEMENT(snd_pcm_sw_params_set_start_threshold),
246 ELEMENT(snd_pcm_sw_params_sizeof),
247};
248#undef ELEMENT
249
250/** Init once. */
251static RTONCE g_AlsaLibInitOnce = RTONCE_INITIALIZER;
252
253
254/** @callback_method_impl{FNRTONCE} */
255static DECLCALLBACK(int32_t) drvHostAudioAlsaLibInitOnce(void *pvUser)
256{
257 RT_NOREF(pvUser);
258 LogFlowFunc(("\n"));
259
260 RTLDRMOD hMod = NIL_RTLDRMOD;
261 int rc = RTLdrLoadSystemEx(VBOX_ALSA_LIB, RTLDRLOAD_FLAGS_NO_UNLOAD, &hMod);
262 if (RT_SUCCESS(rc))
263 {
264 for (uintptr_t i = 0; i < RT_ELEMENTS(SharedFuncs); i++)
265 {
266 rc = RTLdrGetSymbol(hMod, SharedFuncs[i].name, (void **)SharedFuncs[i].pfn);
267 if (RT_SUCCESS(rc))
268 { /* likely */ }
269 else if (SharedFuncs[i].pfnFallback && rc == VERR_SYMBOL_NOT_FOUND)
270 *SharedFuncs[i].pfn = SharedFuncs[i].pfnFallback;
271 else
272 {
273 LogRelFunc(("Failed to load library %s: Getting symbol %s failed: %Rrc\n", VBOX_ALSA_LIB, SharedFuncs[i].name, rc));
274 return rc;
275 }
276 }
277 }
278 else
279 LogRelFunc(("Failed to load library %s (%Rrc)\n", VBOX_ALSA_LIB, rc));
280 return rc;
281}
282
283
284/**
285 * Try to dynamically load the ALSA libraries.
286 *
287 * @returns VBox status code.
288 */
289int audioLoadAlsaLib(void)
290{
291 LogFlowFunc(("\n"));
292 return RTOnce(&g_AlsaLibInitOnce, drvHostAudioAlsaLibInitOnce, NULL);
293}
294
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