avfilter_get_audio_buffer_ref_from_frame 80 libavfilter/avcodec.c return avfilter_get_audio_buffer_ref_from_frame(frame, perms); avfilter_get_audio_buffer_ref_from_frame 53 libavfilter/avcodec.h AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_frame(const AVFrame *frame,