package av1

// matroska "Low Overhead Bitstream Format syntax" format
// "Each Block contains one Temporal Unit containing one or more OBUs. Each OBU stored in the Block MUST contain its header and its payload."
// "The OBUs in the Block follow the [Low Overhead Bitstream Format syntax]. They MUST have the [obu_has_size_field] set to 1 except for the last OBU in the frame, for which [obu_has_size_field] MAY be set to 0, in which case it is assumed to fill the remainder of the frame."

import (
	"github.com/wader/fq/format"
	"github.com/wader/fq/pkg/decode"
	"github.com/wader/fq/pkg/interp"
)

var av1FrameObuGroup decode.Group

func init() {
	interp.RegisterFormat(
		format.Av1Frame,
		&decode.Format{
			Description: "AV1 frame",
			DecodeFn:    frameDecode,
			RootArray:   true,
			RootName:    "frame",
			Dependencies: []decode.Dependency{
				{Groups: []*decode.Group{format.Av1Obu}, Out: &av1FrameObuGroup},
			},
		})
}

func frameDecode(d *decode.D) any {
	for d.NotEnd() {
		d.FieldFormat("obu", &av1FrameObuGroup, nil)
	}

	return nil
}