A double-buffer stream works as a regular (single-buffer) stream, with the difference that it has two memory pointers.

One pointer is used for reading data from the stream, while the other is used for writing data to the stream. This allows for more efficient data transfer, as data can be read and written simultaneously without any delays or interruptions.

When data is written to a double-buffer stream, it is stored in a separate buffer from the one being read from. Once the write buffer is full, it is swapped with the read buffer, allowing the data to be read while new data is written to the other buffer.

Double-buffering is commonly used in multimedia applications such as video playback and audio recording, where a continuous stream of data must be processed in real-time. By using a double-buffer stream, these applications can ensure a smooth and uninterrupted flow of data, without any glitches or pauses.