A "native" ogg vorbis decoder for Go (uses inline stb_vorbis)

vorbis

GoDoc Build Status

This Go package provides a "native" ogg vorbis decoder, but still requires cgo, as it uses inline code from stb_vorbis. Someday, it won't.

The package exports a single function:

var data []byte
…
samples, nchannels, sampleRate, err := vorbis.Decode(data)

This corresponds to stb_vorbis_decode_memory(), but is a little different. Samples is a []int16, corresponding to stb's dynamic array of shorts if you're on the right platforms. The samples seem to be stored native-endian, but I haven't tested many vorbis files. Nchannels is the number of channels, which are interleaved in the samples slice. Err is non-nil if the data is not an ogg vorbis stream according to stb.

Owner
Steve McCoy
Steve McCoy
https://github.com/mccoyst/vorbis
Comments
  • Bug Failed assertion

    Bug Failed assertion

    I ran some fuzzing tests and uncovered a triggered failed assertion. It is reported as: vorbis.go:1063: int compute_codewords(Codebook *, uint8 *, int, uint32 *): Assertion0' failed.`

    See attached crashers: mccoyst-vorbis.zip

  • spell err ?

    spell err ?

    https://github.com/mccoyst/vorbis/blob/9dbc0f6a44d4c242c03121df78584382b6a27061/vorbis.go#L5522

    type Vorbis struct {
	Channels   int
	SampleRate int
	buf        []byte
	r          io.Reader
	v          *_Ctype_struct_stb_vorbis
}

    is _Ctype_struct_stb_vorbis a typo? I can't find it's definition

  • Fixed a few compiler issues in stb_vorbis

    Fixed a few compiler issues in stb_vorbis

    I've tried to get rid of anything that causes compiler warnings for the sake of a clean build, and I don't believe it's had any effect on functionality. Since GCC on Linux requires the -lm flag to include "math.h", I've added that as a #cgo preprocessor to add that when necessary. This has been tested on Windows 8 (64-bit) and Linux Mint 12 (32-bit).

  • A/B test setup

    A/B test setup

    Progress has been slowed partially by my lack of tools for testing decoding (unit tests with raw bytes are a pain). A naive A/B tester + some example audio files should help a lot. This will likely be a separate project so that this one isn't bloated with files.

  • Write a real port

    Write a real port

    This would be good for three reasons:

    • Remove the cgo requirement
    • Improve performance significantly, since the decoded data won't have to be copied from C land.
    • Understand it well enough to write a generalized function that takes a Reader.
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