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143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
package vpx
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// https://storage.googleapis.com/downloads.webmproject.org/docs/vp9/vp9-bitstream-specification-v0.6-20160331-draft.pdf
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/registry"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/scalar"
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)
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// TODO: vpx frame?
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const (
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vp9FeatureProfile = 1
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vp9FeatureLevel = 2
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vp9FeatureBitDepth = 3
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vp9FeatureChromaSubsampling = 4
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)
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var vp9FeatureIDNames = scalar.UToSymStr{
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vp9FeatureProfile: "Profile",
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vp9FeatureLevel: "Level",
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vp9FeatureBitDepth: "Bit Depth",
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vp9FeatureChromaSubsampling: "Chroma Subsampling",
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}
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//nolint:revive
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const (
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CS_UNKNOWN = 0
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CS_BT_601 = 1
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CS_BT_709 = 2
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CS_SMPTE_170 = 3
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CS_SMPTE_240 = 4
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CS_BT_2020 = 5
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CS_RESERVED = 6
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CS_RGB = 7
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)
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var vp9ColorSpaceNames = scalar.UToSymStr{
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CS_UNKNOWN: "unknown",
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CS_BT_601: "bt_601",
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CS_BT_709: "bt_709",
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CS_SMPTE_170: "smpte_170",
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CS_SMPTE_240: "smpte_240",
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CS_BT_2020: "bt_2020",
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CS_RESERVED: "reserved",
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CS_RGB: "rgb",
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}
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var vp9ProfilesMap = scalar.UToDescription{
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0: "8 bit/sample, chroma subsampling: 4:2:0",
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1: "8 bit, chroma subsampling: 4:2:2, 4:4:0, 4:4:4",
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2: "10–12 bit, chroma subsampling: 4:2:0",
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3: "10–12 bit, chroma subsampling: 4:2:2, 4:4:0, 4:4:4",
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}
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.VP9_FRAME,
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Description: "VP9 frame",
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DecodeFn: vp9Decode,
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})
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}
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func vp9DecodeFrameSyncCode(d *decode.D) {
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d.FieldU8("frame_sync_byte_0")
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d.FieldU8("frame_sync_byte_1")
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d.FieldU8("frame_sync_byte_2")
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}
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func vp9DecodeColorConfig(d *decode.D, profile int) {
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bitDepth := 8
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if profile >= 2 {
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tenOrTwelveBit := d.FieldBool("ten_or_twelve_bit")
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if tenOrTwelveBit {
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bitDepth = 12
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} else {
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bitDepth = 10
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}
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}
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d.FieldValueU("bit_depth", uint64(bitDepth))
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colorSpace := d.FieldU3("color_space", vp9ColorSpaceNames)
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_, colorSpaceOk := vp9ColorSpaceNames[colorSpace]
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if !colorSpaceOk || colorSpace != CS_RGB {
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d.FieldU1("color_range")
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if profile == 1 || profile == 3 {
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d.FieldU1("subsampling_x")
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d.FieldU1("subsampling_y")
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d.FieldU1("reserved_zero1")
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} else {
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d.FieldValueU("subsampling_x", 1)
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d.FieldValueU("subsampling_y", 1)
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}
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} else {
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d.FieldValueU("color_range", 1)
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if profile == 1 || profile == 3 {
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d.FieldValueU("subsampling_x", 0)
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d.FieldValueU("subsampling_y", 0)
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d.FieldU1("reserved_zero2")
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}
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}
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}
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func vp9DecodeFrameSize(d *decode.D) {
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d.FieldUFn("frame_width", func(d *decode.D) uint64 { return d.U16() + 1 })
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d.FieldUFn("frame_height", func(d *decode.D) uint64 { return d.U16() + 1 })
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}
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func vp9Decode(d *decode.D, in interface{}) interface{} {
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// TODO: header_size at end? even for show_existing_frame?
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d.FieldU2("frame_marker")
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profileLowBit := d.FieldU1("profile_low_bit")
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profileHighBit := d.FieldU1("profile_high_bit")
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profile := int(profileHighBit<<1 + profileLowBit)
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d.FieldValueU("profile", uint64(profile), vp9ProfilesMap)
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if profile == 3 {
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d.FieldU1("reserved_zero0")
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}
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showExistingFrame := d.FieldBool("show_existing_frame")
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if showExistingFrame {
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d.FieldU2("frame_to_show_map_idx")
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return nil
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}
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frameType := d.FieldBool("frame_type", scalar.BoolToSymStr{true: "non_key_frame", false: "key_frame"})
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d.FieldU1("show_frame")
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d.FieldU1("error_resilient_mode")
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if !frameType {
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// is key frame
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vp9DecodeFrameSyncCode(d)
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vp9DecodeColorConfig(d, profile)
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vp9DecodeFrameSize(d)
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}
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d.FieldRawLen("data", d.BitsLeft())
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return nil
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}
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