#include "global.h"

#include <dlfcn.h>

#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API
#include <alsa/asoundlib.h>

static void *Handle = NULL;

#include "RageUtil.h"
#include "ALSA9Dynamic.h"

/* foo_f dfoo = NULL */
#define FUNC(ret, name, proto) name##_f d##name = NULL
#include "ALSA9Functions.h"
#undef FUNC

static const CString lib = "libasound.so.2";
CString LoadALSA()
{
	ASSERT( Handle == NULL );

	Handle = dlopen( lib, RTLD_NOW );
	if( Handle == NULL )
		return ssprintf("dlopen(%s): %s", lib.c_str(), dlerror());

	CString error;
	/* Eww.  The "new" HW and SW API functions are really prefixed by __,
	 * eg. __snd_pcm_hw_params_set_rate_near. */
#define FUNC(ret, name, proto) \
	d##name = (name##_f) dlsym(Handle, "__" #name); \
	if( !d##name ) { \
		d##name = (name##_f) dlsym(Handle, #name); \
		if( !d##name ) { \
			error="Couldn't load symbol " #name; \
			goto error; \
		} \
	}
#include "ALSA9Functions.h"
#undef FUNC

	return "";
error:
	UnloadALSA();
	return error;
}

void UnloadALSA()
{
	if( Handle )
		dlclose( Handle );
	Handle = NULL;
#define FUNC(ret, name, proto) d##name = NULL;
#include "ALSA9Functions.h"
#undef FUNC
}