115 lines
2.2 KiB
Go
115 lines
2.2 KiB
Go
//go:build !disable_format_mp3 && !disable_codec_lame
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// +build !disable_format_mp3,!disable_codec_lame
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package mp3
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import (
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"errors"
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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/cgo"
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"github.com/viert/go-lame"
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"io"
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"unsafe"
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)
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func (f Format) Description() string {
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return "kvark128/minimp3, LAME (viert/go-lame)"
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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 vbr = true
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var bitrate = 0
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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 "v0":
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vbr = true
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bitrate = 0
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case "v1":
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vbr = true
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bitrate = 1
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case "v2":
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vbr = true
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bitrate = 2
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case "v3":
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vbr = true
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bitrate = 3
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case "320k":
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vbr = false
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bitrate = 320
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case "256k":
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vbr = false
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bitrate = 256
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case "192k":
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vbr = false
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bitrate = 192
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case "128k":
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vbr = false
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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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vbr = false
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bitrate = intVal
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} else if int64Val, ok = val.(int64); ok {
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vbr = false
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bitrate = int(int64Val)
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}
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}
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}
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encoder := lame.NewEncoder(writer)
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if encoder == nil {
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return errors.New("could not create encoder")
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}
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defer encoder.Close()
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if err := encoder.SetNumChannels(source.Channels); err != nil {
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return err
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}
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if err := encoder.SetInSamplerate(source.SampleRate); err != nil {
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return err
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}
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encoder.SetWriteID3TagAutomatic(false)
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if vbr {
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if err := encoder.SetVBR(lame.VBRDefault); err != nil {
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return err
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}
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if err := encoder.SetVBRQuality(float64(bitrate)); err != nil {
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return err
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}
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} else {
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if err := encoder.SetVBR(lame.VBROff); err != nil {
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return err
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}
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if err := encoder.SetBrate(bitrate); 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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samples := cgo.Float32ToInt16(block)
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_, err := encoder.Write(unsafe.Slice((*byte)(unsafe.Pointer(&samples[0])), len(samples)*2))
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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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