118 lines
2.3 KiB
Go
118 lines
2.3 KiB
Go
//go:build !disable_format_vorbis && !disable_codec_libvorbis && cgo
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package vorbis
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import (
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"bytes"
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"fmt"
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"git.gammaspectra.live/S.O.N.G/Kirika/audio"
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"git.gammaspectra.live/S.O.N.G/Kirika/audio/format"
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libvorbis "git.gammaspectra.live/S.O.N.G/go-vorbis"
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"io"
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)
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type Format struct {
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}
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func NewFormat() Format {
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return Format{}
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}
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func (f Format) Name() string {
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return "vorbis"
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}
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func (f Format) DecoderDescription() string {
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return fmt.Sprintf("%s (S.O.N.G/go-vorbis)", libvorbis.Version())
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}
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func (f Format) EncoderDescription() string {
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return f.DecoderDescription()
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}
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func (f Format) Open(r io.ReadSeekCloser) (audio.Source, error) {
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reader, err := libvorbis.NewSeekCloserDecoder(r)
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if err != nil {
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return nil, err
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}
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info := reader.Information()
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source := audio.NewSource[float32](16, int(info.Rate), info.Channels)
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go func() {
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defer source.Close()
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defer reader.Close()
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for {
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buf, channelCount, err := reader.ReadFloat()
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if err != nil {
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return
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}
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if info.Channels != channelCount {
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//Channel count changed!
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return
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}
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source.IngestFloat32(buf)
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}
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}()
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return source, nil
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}
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func (f Format) Encode(source audio.Source, writer io.WriteCloser, options map[string]interface{}) error {
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var bitrate = 128
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if options != nil {
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var val interface{}
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var ok bool
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var intVal int
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var int64Val int64
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var strVal string
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if val, ok = options["bitrate"]; ok {
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if strVal, ok = val.(string); ok {
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switch strVal {
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case "256k":
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bitrate = 256
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case "192k":
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bitrate = 192
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case "128k":
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bitrate = 128
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default:
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return fmt.Errorf("unknown setting bitrate=%s", strVal)
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}
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} else if intVal, ok = val.(int); ok {
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bitrate = intVal
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} else if int64Val, ok = val.(int64); ok {
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bitrate = int(int64Val)
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}
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}
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}
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encoder, err := libvorbis.NewEncoderCBR(writer, source.GetChannels(), source.GetSampleRate(), -1, int64(bitrate*1000), -1)
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if err != nil {
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return err
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}
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defer encoder.Close()
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for block := range source.ToFloat32().GetBlocks() {
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err = encoder.WriteFloat(block)
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if err != nil {
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return err
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}
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}
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encoder.Flush()
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return nil
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}
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func (f Format) Identify(peek [format.IdentifyPeekBytes]byte, extension string) bool {
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return bytes.Compare(peek[:4], []byte{'O', 'g', 'g', 'S'}) == 0 || extension == "vorbis" || extension == "ogg"
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}
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