(r io.ReadSeeker, _f bool)
| 19 | } |
| 20 | |
| 21 | func decode(r io.ReadSeeker, _f bool) (*Info, error) { |
| 22 | reader := binary.ParseReader(r) |
| 23 | buf := reader.ReadBytes(1) |
| 24 | if utils.B2S(buf) != utils.B2S([]byte{0x23}) { |
| 25 | if !_f { |
| 26 | return decode(r, true) |
| 27 | } |
| 28 | return nil, errors.New("unknown audio type") |
| 29 | } |
| 30 | buf = append(buf, reader.ReadBytes(5)...) |
| 31 | |
| 32 | switch { |
| 33 | case strings.HasPrefix(string(buf), "#!AMR\n"): |
| 34 | return &Info{ |
| 35 | Type: amr, |
| 36 | Time: float32(len(reader.ReadAll())) / 1607.0, |
| 37 | }, nil |
| 38 | case string(buf) == "#!SILK": |
| 39 | ver := reader.ReadBytes(3) |
| 40 | if string(ver) != "_V3" { |
| 41 | return nil, fmt.Errorf("unsupported silk version: %s", utils.B2S(ver)) |
| 42 | } |
| 43 | data := reader.ReadAll() |
| 44 | size := len(data) |
| 45 | |
| 46 | var typ Type |
| 47 | if _f { // txsilk |
| 48 | typ = txSilk |
| 49 | } else { |
| 50 | typ = silkV3 |
| 51 | } |
| 52 | |
| 53 | blks := 0 |
| 54 | pos := 0 |
| 55 | |
| 56 | for pos+2 < size { |
| 57 | length := binary2.LittleEndian.Uint16(data[pos : pos+2]) |
| 58 | if length == 0xFFFF { |
| 59 | break |
| 60 | } |
| 61 | blks++ |
| 62 | pos += int(length) + 2 |
| 63 | } |
| 64 | return &Info{ |
| 65 | Type: typ, |
| 66 | Time: float32(blks) * 0.02, |
| 67 | }, nil |
| 68 | default: |
| 69 | return nil, errors.New("unknown audio type") |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | func Decode(r io.ReadSeeker) (*Info, error) { |
| 74 | defer func() { |
no test coverage detected