audio: Decode and RegisterFormat

[hajimehoshi]

Operating System

• Windows
• macOS
• Linux
• FreeBSD
• OpenBSD
• Android
• iOS
• Nintendo Switch
• PlayStation 5
• Xbox
• Web Browsers

What feature would you like to be added?

I propose these APIs for audio:

// RegisterFromat registers audio format for Decode.
func RegisterFromat(name string, magic string, decode func(src io.Reader) (sampleRate int, length int, err error))

// Decode decodes an audio stream and returns a decoded string in 32bit float little-endian format.
// The format is detected by the magic bytes.
func Decode(src io.Reader) (stream io.Reader, format string, sampleRate int, length int, err error)

This is like image.RegisterFormat and sql.Register.

Why is this needed?

This enables to decode audio streams more easily. Users don't have to care which decoder is used.

[hajimehoshi]

The problem is that a magic string is not enough: an Ogg container might have various data, not only Vorbis.