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45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
package transcode
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import (
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"bytes"
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"io"
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)
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// sniffFormat detects container/codec from file header when the path has no extension.
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func sniffFormat(r io.Reader) string {
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head := make([]byte, 32)
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n, _ := io.ReadFull(r, head)
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head = head[:n]
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if len(head) < 4 {
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return ""
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}
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if bytes.HasPrefix(head, []byte("RIFF")) && len(head) >= 12 && bytes.Equal(head[8:12], []byte("WAVE")) {
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return ".wav"
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}
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if bytes.HasPrefix(head, []byte("ID3")) {
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return ".mp3"
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}
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if len(head) >= 2 && head[0] == 0xFF && (head[1]&0xE0) == 0xE0 {
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return ".mp3"
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}
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if bytes.HasPrefix(head, []byte("fLaC")) {
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return ".flac"
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}
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if bytes.HasPrefix(head, []byte("OggS")) {
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return ".ogg"
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}
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if len(head) >= 8 && bytes.Equal(head[4:8], []byte("ftyp")) {
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return ".m4a"
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}
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if bytes.HasPrefix(head, []byte{0xFF, 0xF1}) || bytes.HasPrefix(head, []byte{0xFF, 0xF9}) {
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return ".aac"
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}
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if bytes.HasPrefix(head, []byte("FORM")) && len(head) >= 12 && bytes.Equal(head[8:12], []byte("AIFF")) {
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return ".aiff"
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}
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if bytes.HasPrefix(head, []byte{0x1A, 0x45, 0xDF, 0xA3}) {
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return ".webm"
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}
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return ""
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}
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