alsa-lib/include/pcm_external.h

#ifndef __ALSA_PCM_EXTERNAL_H
#define __ALSA_PCM_EXTERNAL_H

#include "pcm.h"

#define SND_PCM_PLUGIN_ENTRY(name) _snd_pcm_##name##_open
#define SND_PCM_PLUGIN_SYMBOL(name) SND_DLSYM_BUILD_VERSION(SND_PCM_PLUGIN_ENTRY(name), SND_PCM_DLSYM_VERSION);

#define SND_PCM_PLUGIN_DEFINE_FUNC(plugin) \
int SND_PCM_PLUGIN_ENTRY(plugin) (snd_pcm_t **pcmp, const char *name,\
				  snd_config_t *root, snd_config_t *conf, \
				  snd_pcm_stream_t stream, int mode)

#include "pcm_ioplug.h"
#include "pcm_extplug.h"

#endif /* __ALSA_PCM_EXTERNAL_H */