int snd_pcm_voice_setup(snd_pcm_t *handle, int channel, snd_pcm_voice_setup_t *setup);
int snd_pcm_all_voices_setup(snd_pcm_t *handle, int channel, snd_pcm_voice_setup_t *setup);
int snd_pcm_channel_status(snd_pcm_t *handle, snd_pcm_channel_status_t *status);
+int snd_pcm_channel_update(snd_pcm_t *handle, int channel);
int snd_pcm_playback_prepare(snd_pcm_t *handle);
int snd_pcm_capture_prepare(snd_pcm_t *handle);
int snd_pcm_channel_prepare(snd_pcm_t *handle, int channel);
int snd_pcm_channel_flush(snd_pcm_t *handle, int channel);
int snd_pcm_playback_pause(snd_pcm_t *handle, int enable);
int snd_pcm_channel_pause(snd_pcm_t *handle, int channel, int enable);
-int snd_pcm_channel_update(snd_pcm_t *handle, int channel);
ssize_t snd_pcm_transfer_size(snd_pcm_t *handle, int channel);
ssize_t snd_pcm_write(snd_pcm_t *handle, const void *buffer, size_t size);
ssize_t snd_pcm_read(snd_pcm_t *handle, void *buffer, size_t size);