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package mpeg
// ISO/IEC 14496-15, 5.3.3.1.2 Syntax
import (
"github.com/wader/fq/format"
"github.com/wader/fq/pkg/decode"
"github.com/wader/fq/pkg/interp"
)
var avcNALUFormat decode.Group
func init() {
interp.RegisterFormat(
format.AVC_AU,
&decode.Format{
Description: "H.264/AVC Access Unit",
DecodeFn: avcAUDecode,
DefaultInArg: format.AVC_AU_In{
LengthSize: 0,
},
RootArray: true,
RootName: "access_unit",
Dependencies: []decode.Dependency{
{Groups: []*decode.Group{format.AVC_NALU}, Out: &avcNALUFormat},
},
})
}
func avcAUDecode(d *decode.D) any {
var ai format.AVC_AU_In
d.ArgAs(&ai)
if ai.LengthSize == 0 {
// TODO: is annexb the correct name?
annexBDecode(d, avcNALUFormat)
return nil
}
for d.NotEnd() {
d.FieldStruct("nalu", func(d *decode.D) {
l := int64(d.FieldU("length", int(ai.LengthSize)*8)) * 8
d.FieldFormatLen("nalu", l, &avcNALUFormat, nil)
})
}
return nil
}
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