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feat: use 64 bits offset if needed #18

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nikoresu wants to merge 1 commit into from
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feat: use 64 bits offset if needed #18

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39 changes: 33 additions & 6 deletions tables.go
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Original file line number Diff line number Diff line change
Expand Up @@ -203,12 +203,39 @@ func (b *StcoBox) Encode() []byte {
}

func buildStco(offsets []uint64) []byte {
entries := make([]uint32, len(offsets))
for i, offset := range offsets {
entries[i] = uint32(offset)
}
box := StcoBox{Offsets: entries}
return box.Encode()
// If any offset doesn't fit in 32 bits, emit a co64 box instead
for _, off := range offsets {
if off >= 0x100000000 {
box := Co64Box{Offsets: offsets}
return box.Encode()
}
}
entries := make([]uint32, len(offsets))
for i, offset := range offsets {
entries[i] = uint32(offset)
}
box := StcoBox{Offsets: entries}
return box.Encode()
}

// --- CO64 ---
type Co64Box struct {
Header BoxHeader
Offsets []uint64
}

func (b *Co64Box) Encode() []byte {
buffer := make([]byte, 16)
binary.BigEndian.PutUint32(buffer[12:16], uint32(len(b.Offsets)))
tempBuffer := make([]byte, 8)
for _, offset := range b.Offsets {
binary.BigEndian.PutUint64(tempBuffer, offset)
buffer = append(buffer, tempBuffer...)
}
b.Header.Size = uint32(len(buffer))
b.Header.Type = [4]byte{'c', 'o', '6', '4'}
b.Header.Put(buffer)
return buffer
}

// --- STSS ---
Expand Down