alsa_stubs.c revision 1ad89e26844e888a8b3d8636371c3855e382f5a8
#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"
static enum { NO = 0, YES, FAIL } isLibLoaded = NO;
static RTLDRMOD hLibAsound = NULL;
/**
* 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;
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, &hLibAsound);
if (RT_FAILURE(rc))
{
LogRelFunc(("Failed to load library %s\n", VBOX_ALSA_LIB));
}
if (RT_SUCCESS(rc))
{
isLibLoaded = YES;
}
LogFlowFunc(("returning %Rrc\n", rc));
return rc;
}
#define PROXY_STUB(function, rettype, signature, shortsig, retval) \
extern rettype function signature; \
rettype function signature \
{ \
static rettype (*pfnFunc) signature = NULL; \
rettype (*pfnResolvedFunc) signature; \
int rc; \
rettype rcFunc = retval; \
\
if (RT_LIKELY(NULL != pfnFunc)) \
{ \
return pfnFunc shortsig; \
} \
AssertReturn(YES == isLibLoaded, retval); \
rc = RTLdrGetSymbol(hLibAsound, #function, (void**)&pfnResolvedFunc); \
if (RT_SUCCESS(rc)) \
{ \
Log2(("%s: resolving symbol on first call.\n", __PRETTY_FUNCTION__)); \
pfnFunc = pfnResolvedFunc; \
rcFunc = pfnFunc shortsig; \
} \
else \
{ \
LogRelFunc(("failed to resolve symbol on first call, rc=%Rrc\n", rc)); \
} \
return rcFunc; \
} \
PROXY_STUB(snd_pcm_hw_params_any, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
(pcm, params), -1)
PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm), -1)
PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm),
(pcm), -1)
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), -1)
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), -1)
PROXY_STUB(snd_pcm_prepare, int, (snd_pcm_t *pcm), (pcm), -1)
PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), (), ~0)
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), -1)
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), -1)
PROXY_STUB(snd_pcm_hw_params, int,
(snd_pcm_t *pcm, snd_pcm_hw_params_t *params),
(pcm, params), -1)
PROXY_STUB(snd_pcm_hw_params_sizeof, size_t, (void), (), ~0)
PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm), ~0)
PROXY_STUB(snd_pcm_open, int,
(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode),
(pcm, name, stream, mode), -1)
PROXY_STUB(snd_lib_error_set_handler, int, (snd_lib_error_handler_t handler),
(handler), -1)
PROXY_STUB(snd_pcm_sw_params, int,
(snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
(pcm, params), -1)
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), -1)
PROXY_STUB(snd_pcm_writei, snd_pcm_sframes_t,
(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size),
(pcm, buffer, size), -1)
PROXY_STUB(snd_pcm_readi, snd_pcm_sframes_t,
(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size),
(pcm, buffer, size), -1)
PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum), NULL)
PROXY_STUB(snd_pcm_drop, int, (snd_pcm_t *pcm), (pcm), -1)
PROXY_STUB(snd_pcm_hw_params_get_buffer_size, int,
(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val),
(params, val), -1)
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), -1)
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), -1)
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), -1)
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), -1)
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), -1)
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), -1)
PROXY_STUB(snd_pcm_sw_params_current, int,
(snd_pcm_t *pcm, snd_pcm_sw_params_t *params),
(pcm, params), -1)
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), -1)