Awesome
dca 
dca is a audio file format that uses opus packets and json metadata.
This package implements a decoder, encoder and a helper streamer for dca v0 and v1.
There's also a standalone command you can use here
Usage
Encoding
// Encoding a file and saving it to disk
encodeSession := dca.EncodeFile("path/to/file.mp3", dca.StdEncodeOptions)
// Make sure everything is cleaned up, that for example the encoding process if any issues happened isnt lingering around
defer encodeSession.Cleanup()
output, err := os.Create("output.dca")
if err != nil {
// Handle the error
}
io.Copy(output, encodeSession)
Decoding, the decoder automatically detects dca version aswell as if metadata was available
// inputReader is an io.Reader, like a file for example
decoder := dca.NewDecoder(inputReader)
for {
frame, err := decoder.OpusFrame()
if err != nil {
if err != io.EOF {
// Handle the error
}
break
}
// Do something with the frame, in this example were sending it to discord
select{
case voiceConnection.OpusSend <- frame:
case <-time.After(time.Second):
// We haven't been able to send a frame in a second, assume the connection is borked
return
}
}
Using the helper streamer, the streamer creates a pausable stream to Discord.
// Source is an OpusReader, both EncodeSession and decoder implements opusreader
done := make(chan error)
streamer := dca.NewStreamer(source, voiceConnection, done)
err := <- done
if err != nil && err != io.EOF {
// Handle the error
}
Using this youtube-dl Go package, one can stream music to Discord from Youtube
// Change these accordingly
options := dca.StdEncodeOptions
options.RawOutput = true
options.Bitrate = 96
options.Application = "lowdelay"
videoInfo, err := ytdl.GetVideoInfo(videoURL)
if err != nil {
// Handle the error
}
format := videoInfo.Formats.Extremes(ytdl.FormatAudioBitrateKey, true)[0]
downloadURL, err := videoInfo.GetDownloadURL(format)
if err != nil {
// Handle the error
}
encodingSession, err := dca.EncodeFile(downloadURL.String(), options)
if err != nil {
// Handle the error
}
defer encodingSession.Cleanup()
done := make(chan error)
dca.NewStream(encodingSession, voiceConnection, done)
err := <- done
if err != nil && err != io.EOF {
// Handle the error
}