149 lines
2.9 KiB
Go
149 lines
2.9 KiB
Go
//go:build !disable_format_opus
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// +build !disable_format_opus
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package opus
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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/filter"
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"git.gammaspectra.live/S.O.N.G/Kirika/cgo"
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libopus "git.gammaspectra.live/S.O.N.G/go-pus"
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"io"
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)
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const FixedSampleRate int = 48000
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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 "opus"
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}
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func (f Format) Description() string {
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return "libopus (S.O.N.G/go-pus)"
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}
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func (f Format) Open(r io.ReadSeekCloser) (audio.Source, error) {
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stream, err := libopus.NewStream(r)
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if err != nil {
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return audio.Source{}, err
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}
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newChannel := make(chan []float32)
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go func() {
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defer stream.Close()
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defer close(newChannel)
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buf := make([]int16, 120*FixedSampleRate*2)
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for {
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n, err := stream.ReadStereo(buf)
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if err != nil {
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return
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}
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if n > 0 {
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newChannel <- cgo.Int16ToFloat32(buf[:n*2], 16)
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}
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}
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}()
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//We always get two channels via stereo api
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return audio.Source{
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Channels: 2,
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SampleRate: FixedSampleRate,
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Blocks: newChannel,
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}, 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 = 0
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var resampleQuality = filter.Linear
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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 "auto":
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bitrate = 0
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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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if val, ok = options["resampleQuality"]; ok {
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if typeVal, ok := val.(filter.ResampleQuality); ok {
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resampleQuality = typeVal
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} else if intVal, ok = val.(int); ok {
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resampleQuality = filter.ResampleQuality(intVal)
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} else if int64Val, ok = val.(int64); ok {
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resampleQuality = filter.ResampleQuality(int64Val)
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}
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}
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}
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source = filter.NewResampleFilter(FixedSampleRate, resampleQuality, 0).Process(source)
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encoder, err := libopus.NewEncoder(FixedSampleRate, source.Channels, libopus.AppAudio, writer)
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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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if bitrate == 0 {
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err = encoder.SetBitrateToAuto()
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if err != nil {
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return err
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}
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} else {
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//kbits to bits
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err = encoder.SetBitrate(bitrate * 1024)
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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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for block := range source.Blocks {
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err = encoder.Encode(cgo.Float32ToInt16(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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return nil
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}
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func (f Format) Identify(peek []byte, extension string) bool {
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return bytes.Compare(peek[:4], []byte{'O', 'g', 'g', 'S'}) == 0 || extension == "opus" || extension == "ogg"
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}
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