/** @brief Slot in @ref fds */
int slot;
+ /** @brief Set when playable
+ *
+ * A track becomes playable whenever it fills its buffer or reaches EOF; it
+ * stops being playable when it entirely empties its buffer. Tracks start
+ * out life not playable.
+ */
+ int playable;
+
/** @brief Input buffer
*
* 1Mbyte is enough for nearly 6s of 44100Hz 16-bit stereo