+ /** Try to fetch some audio from a specific place in this content.
+ * @param frame Frame to start from.
+ * @param length Frames to get.
+ * @param accurate true to try hard to return frames from exactly `frame', false if we don't mind nearby frames.
+ * @return Time-stamped audio data which may or may not be from the location (and of the length) requested.
+ */
+ boost::shared_ptr<ContentAudio> get_audio (AudioFrame time, AudioFrame length, bool accurate);
+