I implement a streaming player for monophonic Sun (.au) and AIFF (.aif) audio files.
Example of use:
(StreamingMonoSound onFileNamed: 'song.aif') play.

	initialization
	initStream:headerStart:

	other
	closeFile extractFrom:to:

	playing
	millisecondsSinceStart playSampleCount:into:startingAt: reset samplesRemaining

	private
	createMixer currentSampleIndex loadBuffer:compressedSampleCount: loadBuffer:uncompressedSampleCount: loadBuffersForSampleCount: loadFromLeftovers:sampleCount: readAIFFHeader readHeader readSunAudioHeader startOver

	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.

	initialization	top
	initStream:headerStart: Initialize for streaming from the given stream. The audio file header starts at the given stream position.

	other	top
	closeFile Close my stream, if it responds to close.
	extractFrom:to: Extract a portion of this sound between the given start and end times. The current implementation only works if the sound is uncompressed.

	playing	top
	millisecondsSinceStart Answer the number of milliseconds of 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 to be played.

	private	top
	createMixer Create a mixed sound consisting of sampled sounds with one sound buffer's worth of samples.
	currentSampleIndex Answer the index of the current sample.
	loadBuffer:compressedSampleCount: Load the given sound buffer from the compressed sample stream.
	loadBuffer:uncompressedSampleCount: Load the given sound buffer from the uncompressed sample stream.
	loadBuffersForSampleCount: Load the sound buffers from the stream.
	loadFromLeftovers:sampleCount: Load the given sound buffer from the samples leftover from the last frame. Answer the number of samples loaded, which typically is less than sampleCount.
	readAIFFHeader Read an AIFF file header from stream.
	readHeader Read the sound file header from my stream.
	readSunAudioHeader Read a Sun audio file header from my stream.
	startOver Jump back to the first sample.

	instance creation	top
	onFileNamed: Answer an instance of me for playing the file with the given name.
	onFileNamed:headerStart: Answer an instance of me for playing audio data starting at the given position in the file with the given name.