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An audio file can only play sound between two PCM samples (the 'start' and 'end' of section of a wave form). Therefore when calculating duration from a count of PCM samples we need to subtract one first (the 'end' sample which has no duration of its own). This only changes durations by one PCM sample (21us - 22us for 44.1kHz sample rate). PiperOrigin-RevId: 596990306