Glenn Maynard
95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
#include "global.h"
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#include <dlfcn.h>
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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#include <alsa/asoundlib.h>
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static void *Handle = NULL;
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#include "RageUtil.h"
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#include "ALSA9Dynamic.h"
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/* foo_f dfoo = NULL */
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#define FUNC(ret, name, proto) name##_f d##name = NULL
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#include "ALSA9Functions.h"
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#undef FUNC
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static const CString lib = "libasound.so.2";
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CString LoadALSA()
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{
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/* If /proc/asound/ doesn't exist, chances are we're on an OSS system. We shouldn't
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* touch ALSA at all, since many OSS systems have old, broken versions of ALSA lying
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* around; we're likely to crash if we go near it. Do this first, before loading
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* the ALSA library, since making any ALSA calls may load ALSA core modules.
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*
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* It's vaguely possible that a module autoloader would load the entire ALSA module set
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* on use, and this would prevent that from happening. I don't know if anyone actually
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* does that, though: they're often configured to load snd (the core module) if ALSA
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* devices are accessed, but hardware drivers are typically loaded on boot. */
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if( !IsADirectory("/proc/asound/") )
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return "/proc/asound/ does not exist";
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ASSERT( Handle == NULL );
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Handle = dlopen( lib, RTLD_NOW );
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if( Handle == NULL )
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return ssprintf("dlopen(%s): %s", lib.c_str(), dlerror());
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CString error;
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/* Eww. The "new" HW and SW API functions are really prefixed by __,
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* eg. __snd_pcm_hw_params_set_rate_near. */
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#define FUNC(ret, name, proto) \
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d##name = (name##_f) dlsym(Handle, "__" #name); \
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if( !d##name ) { \
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d##name = (name##_f) dlsym(Handle, #name); \
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if( !d##name ) { \
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error="Couldn't load symbol " #name; \
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goto error; \
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} \
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}
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#include "ALSA9Functions.h"
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#undef FUNC
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return "";
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error:
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UnloadALSA();
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return error;
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}
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void UnloadALSA()
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{
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if( Handle )
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dlclose( Handle );
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Handle = NULL;
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#define FUNC(ret, name, proto) d##name = NULL;
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#include "ALSA9Functions.h"
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#undef FUNC
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}
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/*
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* (c) 2003-2004 Glenn Maynard
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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