I implement a streaming player for MPEG or MP3 files.
Example of use:
(StreamingMP3Sound onFileNamed: 'song.mp3') play.

	converting
	storeSunAudioOn:compressionType:

	file ops
	closeFile mpegFileIsOpen

	initialization
	initMPEGFile:streamIndex:

	playing
	millisecondsSinceStart playSampleCount:into:startingAt: reset samplesRemaining

	private
	createMixer loadBuffersForSampleCount:

	accessing	top
	duration Answer the duration of this sound in seconds.
	repeat Answer the repeat flag.
	repeat: Set the repeat flag. If true, this sound will loop back to the beginning when it gets to the end.
	soundPosition Answer the relative position of sound playback as a number between 0.0 and 1.0.
	soundPosition: Jump to the position the given fraction through the sound file. The argument is a number between 0.0 and 1.0.
	streamSamplingRate Answer the sampling rate of the MP3 stream.
	volume Answer my volume.
	volume: Set my volume to the given number between 0.0 and 1.0.

	converting	top
	storeSunAudioOn:compressionType: Store myself on the given stream as a monophonic sound compressed with the given type of compression. The sampling rate is reduced to 22050 samples/second if it is higher.

	file ops	top
	closeFile Close the MP3 or MPEG file.
	mpegFileIsOpen Answer true if I have an open, valid MPEG file handle. If the handle is not valid, try to re-open the file.

	initialization	top
	initMPEGFile:streamIndex: Initialize for playing the given stream of the given MPEG or MP3 file.

	playing	top
	millisecondsSinceStart Answer the number of milliseconds since this sound started playing.
	playSampleCount:into:startingAt: Mix the next n samples of this sound into the given buffer starting at the given index
	reset Reset my internal state for a replay. Methods that override this method should do super reset.
	samplesRemaining Answer the number of samples remaining until the end of this sound. A sound with an indefinite ending time should answer some large integer such as 1000000.

	private	top
	createMixer Create a mixed sound consisting of sampled sounds with one sound buffer's worth of samples. The sound has the same sampling rate and number of channels as the MPEG or MP3 file.
	loadBuffersForSampleCount: Load the sound buffers for all tracks with the next count samples from the MPEG file sound track.

	instance creation	top
	onFileNamed: Answer an instance of me for playing the sound track of the MPEG or MP3 file with the given name. Answer nil the file is not a valid MPEG or MP3 file.