| 14 | } |
| 15 | |
| 16 | func (e *Encoder) WriteHeader() error { |
| 17 | if err := writeLe(e.Output, []byte("RIFF")); err != nil { |
| 18 | return err |
| 19 | } |
| 20 | |
| 21 | if err := writeLe(e.Output, uint32(0)); err != nil { // Placeholder for file size |
| 22 | return err |
| 23 | } |
| 24 | |
| 25 | if err := writeLe(e.Output, []byte("WAVE")); err != nil { |
| 26 | return err |
| 27 | } |
| 28 | |
| 29 | if err := writeLe(e.Output, []byte("fmt ")); err != nil { |
| 30 | return err |
| 31 | } |
| 32 | if err := writeLe(e.Output, uint32(16)); err != nil { |
| 33 | return err |
| 34 | } |
| 35 | |
| 36 | if err := writeLe(e.Output, uint16(1)); err != nil { // Audio format: PCM |
| 37 | return err |
| 38 | } |
| 39 | if err := writeLe(e.Output, uint16(1)); err != nil { // Number of channels: 1 (mono) |
| 40 | return err |
| 41 | } |
| 42 | if err := writeLe(e.Output, uint32(e.SampleRate)); err != nil { |
| 43 | return err |
| 44 | } |
| 45 | |
| 46 | if err := writeLe(e.Output, uint32(e.SampleRate*e.BitDepth/8)); err != nil { |
| 47 | return err |
| 48 | } |
| 49 | |
| 50 | if err := writeLe(e.Output, uint16(e.BitDepth/8)); err != nil { |
| 51 | return err |
| 52 | } |
| 53 | if err := writeLe(e.Output, uint16(e.BitDepth)); err != nil { |
| 54 | return err |
| 55 | } |
| 56 | |
| 57 | if err := writeLe(e.Output, []byte("data")); err != nil { |
| 58 | return err |
| 59 | } |
| 60 | |
| 61 | if err := writeLe(e.Output, uint32(0)); err != nil { //Placeholder for data size |
| 62 | return err |
| 63 | } |
| 64 | e.isHeaderWritten = true |
| 65 | return nil |
| 66 | } |
| 67 | |
| 68 | func writeLe[T []byte | uint32 | uint16 | uint8](w io.Writer, data T) error { |
| 69 | return binary.Write(w, binary.LittleEndian, data) |