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