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co64.go
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co64.go
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package mp4
import (
"io"
"io/ioutil"
)
// Co64Box - Chunk Large Offset Box
//
// Contained in : Sample Table box (stbl)
//
// 64-bit version of StcoBox
type Co64Box struct {
Version byte
Flags uint32
ChunkOffset []uint64
}
// DecodeStco - box-specific decode
func DecodeCo64(hdr *boxHeader, startPos uint64, r io.Reader) (Box, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
sr := NewSliceReader(data)
versionAndFlags := sr.ReadUint32()
nrEntries := sr.ReadUint32()
b := &Co64Box{
Version: byte(versionAndFlags >> 24),
Flags: versionAndFlags & flagsMask,
ChunkOffset: make([]uint64, nrEntries),
}
for i := uint32(0); i < nrEntries; i++ {
b.ChunkOffset[i] = sr.ReadUint64()
}
return b, nil
}
// Type - box-specific type
func (b *Co64Box) Type() string {
return "co64"
}
// Size - box-specific size
func (b *Co64Box) Size() uint64 {
return uint64(boxHeaderSize + 8 + len(b.ChunkOffset)*8)
}
// Encode - box-specific encode
func (b *Co64Box) Encode(w io.Writer) error {
err := EncodeHeader(b, w)
if err != nil {
return err
}
buf := makebuf(b)
sw := NewSliceWriter(buf)
versionAndFlags := (uint32(b.Version) << 24) + b.Flags
sw.WriteUint32(versionAndFlags)
sw.WriteUint32(uint32(len(b.ChunkOffset)))
for i := range b.ChunkOffset {
sw.WriteUint64(b.ChunkOffset[i])
}
_, err = w.Write(buf)
return err
}
func (b *Co64Box) Info(w io.Writer, specificBoxLevels, indent, indentStep string) error {
bd := newInfoDumper(w, indent, b, int(b.Version), b.Flags)
level := getInfoLevel(b, specificBoxLevels)
if level >= 1 {
for i := range b.ChunkOffset {
bd.write(" - entry[%d]: chunkOffset=%d", i+1, b.ChunkOffset[i])
}
}
return bd.err
}