191 lines
4.3 KiB
Go
191 lines
4.3 KiB
Go
//go:build !disable_format_alac && enable_codec_libalac
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// +build !disable_format_alac,enable_codec_libalac
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package alac
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import (
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"errors"
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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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"git.gammaspectra.live/S.O.N.G/Kirika/cgo"
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go_alac "git.gammaspectra.live/S.O.N.G/go-alac"
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"io"
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"time"
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"unsafe"
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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 "alac"
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}
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func (f Format) Description() string {
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return "libalac (S.O.N.G/go-alac)"
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}
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func (f Format) Open(r io.ReadSeekCloser) (audio.Source, error) {
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mp4Demuxer, err := tryDecodeMP4(r)
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if err != nil {
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return audio.Source{}, err
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}
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decoder := go_alac.NewFrameDecoder(mp4Demuxer.cookie)
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if decoder == nil {
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return audio.Source{}, errors.New("could not decode")
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}
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newChannel := make(chan []float32)
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go func() {
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defer close(newChannel)
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for {
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samples := mp4Demuxer.Read()
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if samples == nil {
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return
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}
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for _, sample := range samples {
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_, pcm := decoder.ReadPacket(sample)
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if pcm == nil {
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return
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}
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newChannel <- cgo.Int32ToFloat32(cgo.BytesToInt32(pcm, decoder.GetBitDepth()), decoder.GetBitDepth())
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}
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}
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}()
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return audio.Source{
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Channels: decoder.GetChannels(),
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SampleRate: decoder.GetSampleRate(),
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Blocks: newChannel,
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}, nil
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}
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func (f Format) OpenAnalyzer(r io.ReadSeekCloser) (audio.Source, format.AnalyzerChannel, error) {
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mp4Demuxer, err := tryDecodeMP4(r)
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if err != nil {
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return audio.Source{}, nil, err
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}
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decoder := go_alac.NewFrameDecoder(mp4Demuxer.cookie)
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if decoder == nil {
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return audio.Source{}, nil, errors.New("could not decode")
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}
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newChannel := make(chan []float32)
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analyzerChannel := make(format.AnalyzerChannel)
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go func() {
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defer close(newChannel)
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defer close(analyzerChannel)
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for {
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samples := mp4Demuxer.Read()
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if samples == nil {
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return
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}
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for _, sample := range samples {
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_, pcm := decoder.ReadPacket(sample)
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if pcm == nil {
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return
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}
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intSamples := cgo.BytesToInt32(pcm, decoder.GetBitDepth())
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newChannel <- cgo.Int32ToFloat32(intSamples, decoder.GetBitDepth())
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analyzerChannel <- &format.AnalyzerPacket{
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Samples: intSamples,
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Channels: decoder.GetChannels(),
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BitDepth: decoder.GetBitDepth(),
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SampleRate: decoder.GetSampleRate(),
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}
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}
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}
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}()
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return audio.Source{
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Channels: decoder.GetChannels(),
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SampleRate: decoder.GetSampleRate(),
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Blocks: newChannel,
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}, analyzerChannel, 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 bitsPerSample = 16
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var fastMode = false
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var segmentDuration = time.Millisecond * 100
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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 boolVal bool
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if val, ok = options["bitdepth"]; ok {
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if intVal, ok = val.(int); ok {
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bitsPerSample = intVal
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} else if int64Val, ok = val.(int64); ok {
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bitsPerSample = int(int64Val)
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}
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}
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if val, ok = options["fast"]; ok {
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if boolVal, ok = val.(bool); ok {
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fastMode = boolVal
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}
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}
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}
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encoder := go_alac.NewFormatEncoder(writer, source.SampleRate, source.Channels, bitsPerSample, fastMode, segmentDuration)
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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.Flush()
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switch bitsPerSample {
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case 32:
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for block := range source.Blocks {
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samples := cgo.Float32ToInt32(block, 32)
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encoder.Write(unsafe.Slice((*byte)(unsafe.Pointer(&samples[0])), len(samples)*4))
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}
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case 24:
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for block := range source.Blocks {
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samples := cgo.Float32ToInt24(block)
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encoder.Write(unsafe.Slice((*byte)(unsafe.Pointer(&samples[0])), len(samples)))
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}
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case 16:
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for block := range source.Blocks {
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samples := cgo.Float32ToInt16(block)
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encoder.Write(unsafe.Slice((*byte)(unsafe.Pointer(&samples[0])), len(samples)*2))
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}
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case 8:
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for block := range source.Blocks {
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samples := cgo.Float32ToInt8(block)
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encoder.Write(unsafe.Slice((*byte)(unsafe.Pointer(&samples[0])), len(samples)))
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}
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default:
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return errors.New("not supported bits per sample")
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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 extension == "alac" || extension == "mp4" || extension == "m4a"
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}
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