@callback close(t()) :: :ok

Release the sink.

@callback open(keyword()) :: {:ok, t()} | {:error, term()}

Open the sink with the stage's options, which always include :rate (samples per second) and :channels (samples per frame). Returns the state the other callbacks receive.

@callback write(t(), binary()) :: :ok | {:error, term()}

Take one chunk of signed 16-bit little-endian PCM.

Must not block for longer than the audio the chunk represents. Must return {:error, reason} when the destination can no longer take samples; the stage then stops feeding this sink.