diff options
Diffstat (limited to 'src/VBox/Devices/Audio/alsa_stubs.c')
| -rw-r--r-- | src/VBox/Devices/Audio/alsa_stubs.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/VBox/Devices/Audio/alsa_stubs.c b/src/VBox/Devices/Audio/alsa_stubs.c new file mode 100644 index 00000000..db40bc45 --- /dev/null +++ b/src/VBox/Devices/Audio/alsa_stubs.c @@ -0,0 +1,243 @@ +/* $Id: alsa_stubs.c $ */ +/** @file + * Stubs for libasound. + */ + +/* + * Copyright (C) 2006-2019 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. + */ +#define LOG_GROUP LOG_GROUP_DRV_HOST_AUDIO +#include <iprt/assert.h> +#include <iprt/ldr.h> +#include <VBox/log.h> +#include <iprt/errcore.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_lib_error_set_handler, int, (snd_lib_error_handler_t handler), + (handler)) +PROXY_STUB(snd_strerror, const char *, (int errnum), (errnum)) + +PROXY_STUB(snd_device_name_hint, int, + (int card, const char *iface, void ***hints), + (card, iface, hints)) +PROXY_STUB(snd_device_name_free_hint, int, + (void **hints), + (hints)) +PROXY_STUB(snd_device_name_get_hint, char *, + (const void *hint, const char *id), + (hint, id)) + +/* + * PCM + */ + +PROXY_STUB(snd_pcm_avail_update, snd_pcm_sframes_t, (snd_pcm_t *pcm), + (pcm)) +PROXY_STUB(snd_pcm_close, int, (snd_pcm_t *pcm), (pcm)) +PROXY_STUB(snd_pcm_delay, int, (snd_pcm_t *pcm, snd_pcm_sframes_t *frames), + (pcm, frames)) +PROXY_STUB(snd_pcm_nonblock, int, (snd_pcm_t *pcm, int *onoff), + (pcm, onoff)) +PROXY_STUB(snd_pcm_drain, int, (snd_pcm_t *pcm), + (pcm)) +PROXY_STUB(snd_pcm_drop, int, (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_pcm_prepare, int, (snd_pcm_t *pcm), (pcm)) +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_pcm_resume, int, (snd_pcm_t *pcm), (pcm)) +PROXY_STUB(snd_pcm_state, snd_pcm_state_t, (snd_pcm_t *pcm), (pcm)) +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_start, int, (snd_pcm_t *pcm), (pcm)) + +/* + * HW + */ + +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_any, int, + (snd_pcm_t *pcm, snd_pcm_hw_params_t *params), + (pcm, params)) +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_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_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_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_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_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_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_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_hw_params_sizeof, size_t, (void), ()) +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)) + +/* + * SW + */ + +PROXY_STUB(snd_pcm_sw_params, int, + (snd_pcm_t *pcm, snd_pcm_sw_params_t *params), + (pcm, params)) +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_get_start_threshold, int, + (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val), + (params, val)) +PROXY_STUB(snd_pcm_sw_params_set_avail_min, int, + (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val), + (pcm, params, val)) +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)) +PROXY_STUB(snd_pcm_sw_params_sizeof, size_t, (void), ()) + +typedef struct +{ + const char *name; + void (**fn)(void); +} SHARED_FUNC; + +#define ELEMENT(function) { #function , (void (**)(void)) & pfn_ ## function } +static SHARED_FUNC SharedFuncs[] = +{ + ELEMENT(snd_lib_error_set_handler), + ELEMENT(snd_strerror), + + ELEMENT(snd_device_name_hint), + ELEMENT(snd_device_name_get_hint), + ELEMENT(snd_device_name_free_hint), + + ELEMENT(snd_pcm_avail_update), + ELEMENT(snd_pcm_close), + ELEMENT(snd_pcm_delay), + ELEMENT(snd_pcm_drain), + ELEMENT(snd_pcm_drop), + ELEMENT(snd_pcm_nonblock), + ELEMENT(snd_pcm_open), + ELEMENT(snd_pcm_prepare), + ELEMENT(snd_pcm_resume), + ELEMENT(snd_pcm_state), + + ELEMENT(snd_pcm_readi), + ELEMENT(snd_pcm_start), + ELEMENT(snd_pcm_writei), + + ELEMENT(snd_pcm_hw_params), + ELEMENT(snd_pcm_hw_params_any), + ELEMENT(snd_pcm_hw_params_sizeof), + ELEMENT(snd_pcm_hw_params_get_buffer_size), + ELEMENT(snd_pcm_hw_params_get_buffer_size_min), + ELEMENT(snd_pcm_hw_params_get_period_size_min), + ELEMENT(snd_pcm_hw_params_set_access), + ELEMENT(snd_pcm_hw_params_set_buffer_size_near), + ELEMENT(snd_pcm_hw_params_set_buffer_time_near), + ELEMENT(snd_pcm_hw_params_set_channels_near), + ELEMENT(snd_pcm_hw_params_set_format), + ELEMENT(snd_pcm_hw_params_get_period_size), + ELEMENT(snd_pcm_hw_params_set_period_size_near), + ELEMENT(snd_pcm_hw_params_set_period_time_near), + ELEMENT(snd_pcm_hw_params_set_rate_near), + + ELEMENT(snd_pcm_sw_params), + ELEMENT(snd_pcm_sw_params_current), + ELEMENT(snd_pcm_sw_params_get_start_threshold), + ELEMENT(snd_pcm_sw_params_set_avail_min), + ELEMENT(snd_pcm_sw_params_set_start_threshold), + ELEMENT(snd_pcm_sw_params_sizeof), +}; +#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; +} + |