Gapless audio playback

A method of gapless playback of audio tracks on a portable media device, the method comprising:

• rendering a plurality of samples of a current audio track to a global audio renderer device handler;
• detecting an end-of-stream soon event via a source filter of a current filter graph corresponding to the current audio track;
• pre-rolling a next filter graph corresponding to a next audio track upon detecting the end-of-stream soon event;
• pausing the next filter graph after pre-rolling the next filter graph;
• detecting an end-of-stream event signaling an end of the current audio track via an audio renderer filter of the current filter graph;
• removing a compression artifact from the current audio track;
• and
• rendering a plurality of samples of the next audio track to the global audio renderer device handler.

A method of gapless playback of audio tracks on a portable media device, the method comprising:

• rendering a plurality of samples of a current audio track;
• detecting an end-of-stream soon event via a source filter corresponding to the current audio track;
• determining a remaining duration of the current audio track;
• verifying that the current audio track is an audio track;
• identifying a next audio track;
• starting a preroll delay timer of a predetermined preroll delay amount;
• upon expiration of the preroll delay timer, pre-rolling a next filter graph corresponding to the next audio track;
• starting a delay timer for a period based upon the remaining duration of the current audio track;
• pausing the next filter graph until the delay timer expires;
• resetting a gapless audio event;
• detecting an end-of-stream event signaling an end of the current audio track;
• upon detecting the end-of-stream event, removing a compression artifact from the current audio track;
• and
• setting the gapless audio event that triggers rendering of a plurality of samples of the next audio track.