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133 lines
3.3 KiB
Go
133 lines
3.3 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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)
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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 = map[uint64]string{
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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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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 = map[uint64]string{
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CS_UNKNOWN: "CS_UNKNOWN",
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CS_BT_601: "CS_BT_601",
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CS_BT_709: "CS_BT_709",
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CS_SMPTE_170: "CS_SMPTE_170",
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CS_SMPTE_240: "CS_SMPTE_240",
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CS_BT_2020: "CS_BT_2020",
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CS_RESERVED: "CS_RESERVED",
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CS_RGB: "CS_RGB",
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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, colorSpaceOk := d.FieldStringMapFn("color_space", vp9ColorSpaceNames, "Unknown", d.U3, decode.NumberDecimal)
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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_zero")
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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_zero")
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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() (uint64, decode.DisplayFormat, string) { return d.U16() + 1, decode.NumberDecimal, "" })
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d.FieldUFn("frame_height", func() (uint64, decode.DisplayFormat, string) { return d.U16() + 1, decode.NumberDecimal, "" })
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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), "")
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if profile == 3 {
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d.FieldU1("reserved_zero")
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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.FieldBoolMapFn("frame_type", "non_key_frame", "key_frame", d.Bool)
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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.FieldBitBufLen("data", d.BitsLeft())
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return nil
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}
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