mirror of
https://github.com/wader/fq.git
synced 2024-11-22 15:45:45 +03:00
143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
package vpx
|
||
|
||
// https://storage.googleapis.com/downloads.webmproject.org/docs/vp9/vp9-bitstream-specification-v0.6-20160331-draft.pdf
|
||
|
||
import (
|
||
"github.com/wader/fq/format"
|
||
"github.com/wader/fq/pkg/decode"
|
||
"github.com/wader/fq/pkg/interp"
|
||
"github.com/wader/fq/pkg/scalar"
|
||
)
|
||
|
||
// TODO: vpx frame?
|
||
|
||
const (
|
||
vp9FeatureProfile = 1
|
||
vp9FeatureLevel = 2
|
||
vp9FeatureBitDepth = 3
|
||
vp9FeatureChromaSubsampling = 4
|
||
)
|
||
|
||
var vp9FeatureIDNames = scalar.UintMapSymStr{
|
||
vp9FeatureProfile: "Profile",
|
||
vp9FeatureLevel: "Level",
|
||
vp9FeatureBitDepth: "Bit Depth",
|
||
vp9FeatureChromaSubsampling: "Chroma Subsampling",
|
||
}
|
||
|
||
const (
|
||
CS_UNKNOWN = 0
|
||
CS_BT_601 = 1
|
||
CS_BT_709 = 2
|
||
CS_SMPTE_170 = 3
|
||
CS_SMPTE_240 = 4
|
||
CS_BT_2020 = 5
|
||
CS_RESERVED = 6
|
||
CS_RGB = 7
|
||
)
|
||
|
||
var vp9ColorSpaceNames = scalar.UintMapSymStr{
|
||
CS_UNKNOWN: "unknown",
|
||
CS_BT_601: "bt_601",
|
||
CS_BT_709: "bt_709",
|
||
CS_SMPTE_170: "smpte_170",
|
||
CS_SMPTE_240: "smpte_240",
|
||
CS_BT_2020: "bt_2020",
|
||
CS_RESERVED: "reserved",
|
||
CS_RGB: "rgb",
|
||
}
|
||
|
||
var vp9ProfilesMap = scalar.UintMapDescription{
|
||
0: "8 bit/sample, chroma subsampling: 4:2:0",
|
||
1: "8 bit, chroma subsampling: 4:2:2, 4:4:0, 4:4:4",
|
||
2: "10–12 bit, chroma subsampling: 4:2:0",
|
||
3: "10–12 bit, chroma subsampling: 4:2:2, 4:4:0, 4:4:4",
|
||
}
|
||
|
||
func init() {
|
||
interp.RegisterFormat(
|
||
format.VP9_Frame,
|
||
&decode.Format{
|
||
Description: "VP9 frame",
|
||
DecodeFn: vp9Decode,
|
||
})
|
||
}
|
||
|
||
func vp9DecodeFrameSyncCode(d *decode.D) {
|
||
d.FieldU8("frame_sync_byte_0")
|
||
d.FieldU8("frame_sync_byte_1")
|
||
d.FieldU8("frame_sync_byte_2")
|
||
}
|
||
|
||
func vp9DecodeColorConfig(d *decode.D, profile int) {
|
||
bitDepth := 8
|
||
if profile >= 2 {
|
||
tenOrTwelveBit := d.FieldBool("ten_or_twelve_bit")
|
||
if tenOrTwelveBit {
|
||
bitDepth = 12
|
||
} else {
|
||
bitDepth = 10
|
||
}
|
||
}
|
||
d.FieldValueUint("bit_depth", uint64(bitDepth))
|
||
colorSpace := d.FieldU3("color_space", vp9ColorSpaceNames)
|
||
_, colorSpaceOk := vp9ColorSpaceNames[colorSpace]
|
||
if !colorSpaceOk || colorSpace != CS_RGB {
|
||
d.FieldU1("color_range")
|
||
if profile == 1 || profile == 3 {
|
||
d.FieldU1("subsampling_x")
|
||
d.FieldU1("subsampling_y")
|
||
d.FieldU1("reserved_zero1")
|
||
} else {
|
||
d.FieldValueUint("subsampling_x", 1)
|
||
d.FieldValueUint("subsampling_y", 1)
|
||
}
|
||
} else {
|
||
d.FieldValueUint("color_range", 1)
|
||
if profile == 1 || profile == 3 {
|
||
d.FieldValueUint("subsampling_x", 0)
|
||
d.FieldValueUint("subsampling_y", 0)
|
||
d.FieldU1("reserved_zero2")
|
||
}
|
||
}
|
||
}
|
||
|
||
func vp9DecodeFrameSize(d *decode.D) {
|
||
d.FieldUintFn("frame_width", func(d *decode.D) uint64 { return d.U16() + 1 })
|
||
d.FieldUintFn("frame_height", func(d *decode.D) uint64 { return d.U16() + 1 })
|
||
}
|
||
|
||
func vp9Decode(d *decode.D) any {
|
||
|
||
// TODO: header_size at end? even for show_existing_frame?
|
||
|
||
d.FieldU2("frame_marker")
|
||
profileLowBit := d.FieldU1("profile_low_bit")
|
||
profileHighBit := d.FieldU1("profile_high_bit")
|
||
profile := int(profileHighBit<<1 + profileLowBit)
|
||
d.FieldValueUint("profile", uint64(profile), vp9ProfilesMap)
|
||
if profile == 3 {
|
||
d.FieldU1("reserved_zero0")
|
||
}
|
||
showExistingFrame := d.FieldBool("show_existing_frame")
|
||
if showExistingFrame {
|
||
d.FieldU2("frame_to_show_map_idx")
|
||
return nil
|
||
}
|
||
|
||
frameType := d.FieldBool("frame_type", scalar.BoolMapSymStr{true: "non_key_frame", false: "key_frame"})
|
||
d.FieldU1("show_frame")
|
||
d.FieldU1("error_resilient_mode")
|
||
|
||
if !frameType {
|
||
// is key frame
|
||
vp9DecodeFrameSyncCode(d)
|
||
vp9DecodeColorConfig(d, profile)
|
||
vp9DecodeFrameSize(d)
|
||
}
|
||
|
||
d.FieldRawLen("data", d.BitsLeft())
|
||
|
||
return nil
|
||
}
|