56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
package common
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import "bytes"
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type Sniffer func(header []byte) bool
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var snifferRegistry = map[string]Sniffer{
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".mp3": SnifferMP3,
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".flac": SnifferFLAC,
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".ogg": SnifferOGG,
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".m4a": SnifferM4A,
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".wav": SnifferWAV,
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".wma": SnifferWMA,
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".aac": SnifferAAC,
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".dff": SnifferDFF,
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}
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func SniffAll(header []byte) (string, bool) {
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for ext, sniffer := range snifferRegistry {
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if sniffer(header) {
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return ext, true
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}
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}
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return "", false
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}
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func SnifferM4A(header []byte) bool {
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return len(header) >= 8 && bytes.Equal([]byte("ftyp"), header[4:8])
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}
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func SnifferOGG(header []byte) bool {
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return bytes.HasPrefix(header, []byte("OggS"))
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}
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func SnifferFLAC(header []byte) bool {
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return bytes.HasPrefix(header, []byte("fLaC"))
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}
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func SnifferMP3(header []byte) bool {
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return bytes.HasPrefix(header, []byte("ID3"))
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}
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func SnifferWAV(header []byte) bool {
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return bytes.HasPrefix(header, []byte("RIFF"))
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}
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func SnifferWMA(header []byte) bool {
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return bytes.HasPrefix(header, []byte("\x30\x26\xb2\x75\x8e\x66\xcf\x11\xa6\xd9\x00\xaa\x00\x62\xce\x6c"))
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}
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func SnifferAAC(header []byte) bool {
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return bytes.HasPrefix(header, []byte{0xFF, 0xF1})
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}
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// SnifferDFF sniff a DSDIFF format
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// reference to: https://www.sonicstudio.com/pdf/dsd/DSDIFF_1.5_Spec.pdf
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func SnifferDFF(header []byte) bool {
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return bytes.HasPrefix(header, []byte("FRM8"))
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}
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