| 1 | /** @file
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| 2 | *
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| 3 | * Stubs for libasound.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 18 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 19 | * additional information or have any questions.
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| 20 | */
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| 21 |
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| 22 | #include <iprt/assert.h>
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| 23 | #include <iprt/ldr.h>
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| 24 | #define LOG_GROUP LOG_GROUP_DEV_AUDIO
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| 25 | #include <VBox/log.h>
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| 26 | #include <VBox/err.h>
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| 27 |
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| 28 | #include <alsa/asoundlib.h>
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| 29 |
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| 30 | #include "alsa_stubs.h"
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| 31 |
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| 32 | #define VBOX_ALSA_LIB "libasound.so.2"
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| 33 |
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| 34 | #define PROXY_STUB(function, rettype, signature, shortsig) \
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| 35 | void (*function ## _fn)(void); \
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| 36 | rettype function signature \
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| 37 | { return ( (rettype (*) signature) function ## _fn ) shortsig; }
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| 38 |
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| 39 | PROXY_STUB(snd_pcm_hw_params_any, int,
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| 40 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
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| 41 | (pcm, params))
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| 42 | PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm))
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| 43 | PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm),
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| 44 | (pcm))
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| 45 | PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
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| 46 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
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| 47 | (pcm, params, val))
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| 48 | PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
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| 49 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
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| 50 | (pcm, params, val, dir))
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| 51 | PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm))
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| 52 | PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
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| 53 | PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
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| 54 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
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| 55 | (pcm, params, val, dir))
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| 56 | PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
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| 57 | (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
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| 58 | (params, frames, dir))
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| 59 | PROXY_STUB(snd_pcm_hw_params, int,
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| 60 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
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| 61 | (pcm, params))
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| 62 | PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
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| 63 | PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
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| 64 | PROXY_STUB(snd_pcm_open, int,
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| 65 | (snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
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| 66 | (pcm, name, stream, mode))
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| 67 | PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
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| 68 | (handler))
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| 69 | PROXY_STUB(snd_pcm_sw_params, int,
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| 70 | (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
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| 71 | (pcm, params))
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| 72 | PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
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| 73 | (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
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| 74 | (params, frames, dir))
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| 75 | PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
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| 76 | (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
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| 77 | (pcm, buffer, size))
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| 78 | PROXY_STUB(snd_pcm_readi, snd_pcm_sframes_t,
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| 79 | (snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size),
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| 80 | (pcm, buffer, size))
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| 81 | PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum))
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| 82 | PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm))
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| 83 | PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
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| 84 | (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
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| 85 | (params, val))
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| 86 | PROXY_STUB(snd_pcm_hw_params_set_rate_near, int,
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| 87 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
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| 88 | (pcm, params, val, dir))
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| 89 | PROXY_STUB(snd_pcm_hw_params_set_access, int,
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| 90 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access),
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| 91 | (pcm, params, _access))
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| 92 | PROXY_STUB(snd_pcm_hw_params_set_buffer_time_near, int,
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| 93 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
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| 94 | (pcm, params, val, dir))
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| 95 | PROXY_STUB(snd_pcm_hw_params_set_buffer_size_near, int,
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| 96 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
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| 97 | (pcm, params, val))
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| 98 | PROXY_STUB(snd_pcm_hw_params_get_buffer_size_min, int,
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| 99 | (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
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| 100 | (params, val))
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| 101 | PROXY_STUB(snd_pcm_hw_params_set_format, int,
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| 102 | (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val),
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| 103 | (pcm, params, val))
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| 104 | PROXY_STUB(snd_pcm_sw_params_current, int,
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| 105 | (snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
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| 106 | (pcm, params))
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| 107 | PROXY_STUB(snd_pcm_sw_params_set_start_threshold, int,
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| 108 | (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
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| 109 | (pcm, params, val))
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| 110 |
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| 111 | typedef struct
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| 112 | {
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| 113 | const char *name;
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| 114 | void (**fn)(void);
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| 115 | } SHARED_FUNC;
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| 116 |
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| 117 | #define ELEMENT(s) { #s , & s ## _fn }
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| 118 | static SHARED_FUNC SharedFuncs[] =
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| 119 | {
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| 120 | ELEMENT(snd_pcm_hw_params_any),
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| 121 | ELEMENT(snd_pcm_close),
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| 122 | ELEMENT(snd_pcm_avail_update),
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| 123 | ELEMENT(snd_pcm_hw_params_set_channels_near),
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| 124 | ELEMENT(snd_pcm_hw_params_set_period_time_near),
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| 125 | ELEMENT(snd_pcm_prepare),
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| 126 | ELEMENT(snd_pcm_sw_params_sizeof),
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| 127 | ELEMENT(snd_pcm_hw_params_set_period_size_near),
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| 128 | ELEMENT(snd_pcm_hw_params_get_period_size),
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| 129 | ELEMENT(snd_pcm_hw_params),
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| 130 | ELEMENT(snd_pcm_hw_params_sizeof),
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| 131 | ELEMENT(snd_pcm_state),
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| 132 | ELEMENT(snd_pcm_open),
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| 133 | ELEMENT(snd_lib_error_set_handler),
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| 134 | ELEMENT(snd_pcm_sw_params),
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| 135 | ELEMENT(snd_pcm_hw_params_get_period_size_min),
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| 136 | ELEMENT(snd_pcm_writei),
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| 137 | ELEMENT(snd_pcm_readi),
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| 138 | ELEMENT(snd_strerror),
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| 139 | ELEMENT(snd_pcm_drop),
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| 140 | ELEMENT(snd_pcm_hw_params_get_buffer_size),
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| 141 | ELEMENT(snd_pcm_hw_params_set_rate_near),
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| 142 | ELEMENT(snd_pcm_hw_params_set_access),
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| 143 | ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
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| 144 | ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
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| 145 | ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
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| 146 | ELEMENT(snd_pcm_hw_params_set_format),
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| 147 | ELEMENT(snd_pcm_sw_params_current),
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| 148 | ELEMENT(snd_pcm_sw_params_set_start_threshold),
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| 149 | };
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| 150 | #undef ELEMENT
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| 151 |
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| 152 | /**
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| 153 | * Try to dynamically load the ALSA libraries. This function is not
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| 154 | * thread-safe, and should be called before attempting to use any of the
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| 155 | * ALSA functions.
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| 156 | *
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| 157 | * @returns iprt status code
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| 158 | */
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| 159 | int audioLoadAlsaLib(void)
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| 160 | {
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| 161 | int rc = VINF_SUCCESS;
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| 162 | int i;
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| 163 | static enum { NO = 0, YES, FAIL } isLibLoaded = NO;
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| 164 | RTLDRMOD hLib;
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| 165 |
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| 166 | LogFlowFunc(("\n"));
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| 167 | /* If this is not NO then the function has obviously been called twice,
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| 168 | which is likely to be a bug. */
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| 169 | if (NO != isLibLoaded)
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| 170 | {
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| 171 | AssertMsgFailed(("isLibLoaded == %s\n", YES == isLibLoaded ? "YES" : "NO"));
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| 172 | return YES == isLibLoaded ? VINF_SUCCESS : VERR_NOT_SUPPORTED;
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| 173 | }
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| 174 | isLibLoaded = FAIL;
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| 175 | rc = RTLdrLoad(VBOX_ALSA_LIB, &hLib);
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| 176 | if (RT_FAILURE(rc))
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| 177 | {
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| 178 | LogRelFunc(("Failed to load library %s\n", VBOX_ALSA_LIB));
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| 179 | return rc;
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| 180 | }
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| 181 | for (i=0; i<RT_ELEMENTS(SharedFuncs); i++)
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| 182 | {
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| 183 | rc = RTLdrGetSymbol(hLib, SharedFuncs[i].name, (void**)SharedFuncs[i].fn);
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| 184 | if (RT_FAILURE(rc))
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| 185 | return rc;
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| 186 | }
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| 187 | isLibLoaded = YES;
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| 188 | return rc;
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| 189 | }
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