libavfilter/buffersrc.c@av_buffersrc_add_frame_internal;
libavfilter/buffersink.c@compat_read;
libavfilter/buffersink.c@av_buffersink_get_frame_flags;
libavfilter/buffersink.c@av_buffersink_poll_frame;
libavfilter/buffersink.c@av_buffersink_get_samples;
