ff_alsa_close     161 libavdevice/alsa-audio-dec.c     .read_close     = ff_alsa_close,
ff_alsa_close     165 libavdevice/alsa-audio-enc.c     .write_trailer  = ff_alsa_close,
ff_alsa_close      88 libavdevice/alsa-audio.h int ff_alsa_close(AVFormatContext *s1);