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fq/format/av1/av1_ccr.go
Mattias Wadman 2fc0a71a47 decode: Refactor scalar usage
Move scalar into own package.
Split scalar code into decode related scalar code (that reads etc) and
scalar code that just transform the scalar value.
Use a scalar.Mapper interface instead of just a function.
Make mappers, assert and validat impement the interface.
2021-12-02 17:39:26 +01:00

47 lines
1.2 KiB
Go

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