Added genre parsing for mp4 (atom) file metadata #83
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| @@ -201,7 +640,7 @@ func (m metadataMP4) readAtomData(r io.ReadSeeker, name string, size uint32, pro | |||
| if len(b) < 1 { | |||
| return fmt.Errorf("invalid encoding: expected at least %d bytes, for integer tag data, got %d", 1, len(b)) | |||
| } | |||
| data = getInt(b[:1]) | |||
| data = getInt(b[len(b)-1:]) | |||
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Is there some padding in front that we need to jump over? Might be best to explicitly say that (for future reference!)
| if len(b) < 4 { | ||
| return fmt.Errorf("invalid encoding: expected at least %d bytes, for class, got %d", 4, len(b)) | ||
| } | ||
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| if name == "gnre" { | ||
| m.data[name] = getInt(b[len(b)-1:]) |
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The genre identifier in the "gnre" tag is stored at the end of the byte array, subsequent processing is redundant, we only need id
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Ah ok. But then b[len(b)-1:] is going to be 1 byte, so the number will only ever be between 0 and 255 (which will not hit any of the genres added). Is this is in the spec somewhere?
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Yes, the identifier is stored in one byte.
Sorry, couldn't find an explanation / specification.
I can provide an example.
Co-authored-by: David Howden <dhowden@gmail.com>
| if len(b) < 4 { | ||
| return fmt.Errorf("invalid encoding: expected at least %d bytes, for class, got %d", 4, len(b)) | ||
| } | ||
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| if name == "gnre" { | ||
| m.data[name] = getInt(b[len(b)-1:]) |
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Ah ok. But then b[len(b)-1:] is going to be 1 byte, so the number will only ever be between 0 and 255 (which will not hit any of the genres added). Is this is in the spec somewhere?
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