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47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
package av1
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// https://aomediacodec.github.io/av1-spec/av1-spec.pdf
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// https://github.com/ietf-wg-cellar/matroska-specification/blob/master/codec/av1.md
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// https://cdn.rawgit.com/AOMediaCodec/av1-isobmff/v1.0.0/
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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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"github.com/wader/fq/pkg/scalar"
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)
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func init() {
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interp.RegisterFormat(decode.Format{
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Name: format.AV1_CCR,
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Description: "AV1 Codec Configuration Record",
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DecodeFn: ccrDecode,
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})
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}
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func ccrDecode(d *decode.D, _ any) any {
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d.FieldU1("marker")
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d.FieldU7("version")
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d.FieldU3("seq_profile")
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d.FieldU5("seq_level_idx_0")
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d.FieldU1("seq_tier_0")
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d.FieldU1("high_bitdepth")
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d.FieldU1("twelve_bit")
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d.FieldU1("monochrome")
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d.FieldU1("chroma_subsampling_x")
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d.FieldU1("chroma_subsampling_y")
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d.FieldU2("chroma_sample_position")
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d.FieldU3("reserved = 0")
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initalPreDelay := d.FieldBool("initial_presentation_delay_present")
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if initalPreDelay {
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d.FieldU4("initial_presentation_delay", scalar.ActualUAdd(1))
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} else {
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d.FieldU4("reserved")
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}
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if d.BitsLeft() > 0 {
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d.FieldRawLen("config_obus", d.BitsLeft())
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}
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return nil
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}
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