forked from hopesea/godub
/
encode.go
87 lines (73 loc) · 1.55 KB
/
encode.go
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package wav
import (
"encoding/binary"
"io"
)
// Encode encodes wave audio to a given writer.
// WAV file ref: http://www.topherlee.com/software/pcm-tut-wavformat.html
func Encode(w io.Writer, audio *WaveAudio) error {
// Write RIFF header
_, err := w.Write(RiffHeader)
if err != nil {
return err
}
riffSize := 4 + 8 + 16 + 8 + audio.DataSize()
err = binary.Write(w, binary.LittleEndian, uint32(riffSize))
if err != nil {
return err
}
// Write file type
_, err = w.Write(WaveHeader)
if err != nil {
return err
}
// Write format
_, err = w.Write(FmtHeader)
if err != nil {
return err
}
// Write format length
err = binary.Write(w, binary.LittleEndian, uint32(16))
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.Format)
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.Channels)
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.SampleRate)
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.SampleFreq())
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.Sound())
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.BitsPerSample)
if err != nil {
return err
}
// Write data
_, err = w.Write(DataHeader)
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, audio.DataSize())
if err != nil {
return err
}
// Write raw data directly
_, err = w.Write(audio.RawData)
if err != nil {
return err
}
return nil
}