let info = pkt.get_stream().get_info();
validate!(info.get_properties().is_audio());
let pktbuf = pkt.get_buffer();
let nframes = pktbuf.len() / FRAME_SIZE;
let duration = NBLOCKS * BLOCKSIZE * nframes;
let info = pkt.get_stream().get_info();
validate!(info.get_properties().is_audio());
let pktbuf = pkt.get_buffer();
let nframes = pktbuf.len() / FRAME_SIZE;
let duration = NBLOCKS * BLOCKSIZE * nframes;