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/* $Id: alsa_stubs.c $ */
/** @file
* Stubs for libasound.
*/
/*
* Copyright (C) 2006-2010 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include <iprt/assert.h>
#include <iprt/ldr.h>
#define LOG_GROUP LOG_GROUP_DEV_AUDIO
#include <VBox/log.h>
#include <VBox/err.h>
#include <alsa/asoundlib.h>
#include "alsa_stubs.h"
#define VBOX_ALSA_LIB "libasound.so.2"
#define PROXY_STUB(function, rettype, signature, shortsig) \
static rettype (*pfn_ ## function) signature; \
\
rettype VBox_##function signature; \
rettype VBox_##function signature \
{ \
return pfn_ ## function shortsig; \
}
PROXY_STUB(snd_pcm_hw_params_any, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
(pcm, params))
PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm))
PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm),
(pcm))
PROXY_STUB(snd_pcm_hw_params_set_channels_near, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val),
(pcm, params, val))
PROXY_STUB(snd_pcm_hw_params_set_period_time_near, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
(pcm, params, val, dir))
PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm))
PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ())
PROXY_STUB(snd_pcm_hw_params_set_period_size_near, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir),
(pcm, params, val, dir))
PROXY_STUB(snd_pcm_hw_params_get_period_size, int,
(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
(params, frames, dir))
PROXY_STUB(snd_pcm_hw_params, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
(pcm, params))
PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), ())
PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm))
PROXY_STUB(snd_pcm_open, int,
(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
(pcm, name, stream, mode))
PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
(handler))
PROXY_STUB(snd_pcm_sw_params, int,
(snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
(pcm, params))
PROXY_STUB(snd_pcm_hw_params_get_period_size_min, int,
(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir),
(params, frames, dir))
PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
(pcm, buffer, size))
PROXY_STUB(snd_pcm_readi, snd_pcm_sframes_t,
(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size),
(pcm, buffer, size))
PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum))
PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm))
PROXY_STUB(snd_pcm_resume, int, (snd_pcm_t *pcm), (pcm))
PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
(params, val))
PROXY_STUB(snd_pcm_hw_params_set_rate_near, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
(pcm, params, val, dir))
PROXY_STUB(snd_pcm_hw_params_set_access, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access),
(pcm, params, _access))
PROXY_STUB(snd_pcm_hw_params_set_buffer_time_near, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir),
(pcm, params, val, dir))
PROXY_STUB(snd_pcm_hw_params_set_buffer_size_near, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
(pcm, params, val))
PROXY_STUB(snd_pcm_hw_params_get_buffer_size_min, int,
(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
(params, val))
PROXY_STUB(snd_pcm_hw_params_set_format, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val),
(pcm, params, val))
PROXY_STUB(snd_pcm_sw_params_current, int,
(snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
(pcm, params))
PROXY_STUB(snd_pcm_sw_params_set_start_threshold, int,
(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val),
(pcm, params, val))
typedef struct
{
const char *name;
void (**fn)(void);
} SHARED_FUNC;
#define ELEMENT(function) { #function , (void (**)(void)) & pfn_ ## function }
static SHARED_FUNC SharedFuncs[] =
{
ELEMENT(snd_pcm_hw_params_any),
ELEMENT(snd_pcm_close),
ELEMENT(snd_pcm_avail_update),
ELEMENT(snd_pcm_hw_params_set_channels_near),
ELEMENT(snd_pcm_hw_params_set_period_time_near),
ELEMENT(snd_pcm_prepare),
ELEMENT(snd_pcm_sw_params_sizeof),
ELEMENT(snd_pcm_hw_params_set_period_size_near),
ELEMENT(snd_pcm_hw_params_get_period_size),
ELEMENT(snd_pcm_hw_params),
ELEMENT(snd_pcm_hw_params_sizeof),
ELEMENT(snd_pcm_state),
ELEMENT(snd_pcm_open),
ELEMENT(snd_lib_error_set_handler),
ELEMENT(snd_pcm_sw_params),
ELEMENT(snd_pcm_hw_params_get_period_size_min),
ELEMENT(snd_pcm_writei),
ELEMENT(snd_pcm_readi),
ELEMENT(snd_strerror),
ELEMENT(snd_pcm_drop),
ELEMENT(snd_pcm_resume),
ELEMENT(snd_pcm_hw_params_get_buffer_size),
ELEMENT(snd_pcm_hw_params_set_rate_near),
ELEMENT(snd_pcm_hw_params_set_access),
ELEMENT(snd_pcm_hw_params_set_buffer_time_near),
ELEMENT(snd_pcm_hw_params_set_buffer_size_near),
ELEMENT(snd_pcm_hw_params_get_buffer_size_min),
ELEMENT(snd_pcm_hw_params_set_format),
ELEMENT(snd_pcm_sw_params_current),
ELEMENT(snd_pcm_sw_params_set_start_threshold),
};
#undef ELEMENT
/**
* Try to dynamically load the ALSA libraries. This function is not
* thread-safe, and should be called before attempting to use any of the
* ALSA functions.
*
* @returns iprt status code
*/
int audioLoadAlsaLib(void)
{
int rc = VINF_SUCCESS;
unsigned i;
static enum { NO = 0, YES, FAIL } isLibLoaded = NO;
RTLDRMOD hLib;
LogFlowFunc(("\n"));
/* If this is not NO then the function has obviously been called twice,
which is likely to be a bug. */
if (NO != isLibLoaded)
{
AssertMsgFailed(("isLibLoaded == %s\n", YES == isLibLoaded ? "YES" : "NO"));
return YES == isLibLoaded ? VINF_SUCCESS : VERR_NOT_SUPPORTED;
}
isLibLoaded = FAIL;
rc = RTLdrLoad(VBOX_ALSA_LIB, &hLib);
if (RT_FAILURE(rc))
{
LogRelFunc(("Failed to load library %s\n", VBOX_ALSA_LIB));
return rc;
}
for (i=0; i<RT_ELEMENTS(SharedFuncs); i++)
{
rc = RTLdrGetSymbol(hLib, SharedFuncs[i].name, (void**)SharedFuncs[i].fn);
if (RT_FAILURE(rc))
return rc;
}
isLibLoaded = YES;
return rc;
}
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