mirror of https://bitbucket.org/ausocean/av.git
1370 lines
44 KiB
Go
1370 lines
44 KiB
Go
package h264dec
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import (
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"bytes"
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"fmt"
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"math"
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"github.com/ausocean/h264decode/h264/bits"
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"github.com/pkg/errors"
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)
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// Chroma formats as defined in section 6.2, tab 6-1.
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const (
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chromaMonochrome = iota
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chroma420
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chroma422
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chroma444
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)
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type VideoStream struct {
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SPS *SPS
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PPS *PPS
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Slices []*SliceContext
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}
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type SliceContext struct {
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*NalUnit
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*SPS
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*PPS
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*Slice
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}
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type Slice struct {
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Header *SliceHeader
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Data *SliceData
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}
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type SliceHeader struct {
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FirstMbInSlice int
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SliceType int
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PPSID int
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ColorPlaneID int
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FrameNum int
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FieldPic bool
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BottomField bool
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IDRPicID int
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PicOrderCntLsb int
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DeltaPicOrderCntBottom int
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DeltaPicOrderCnt []int
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RedundantPicCnt int
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DirectSpatialMvPred bool
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NumRefIdxActiveOverride bool
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NumRefIdxL0ActiveMinus1 int
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NumRefIdxL1ActiveMinus1 int
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CabacInit int
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SliceQpDelta int
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SpForSwitch bool
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SliceQsDelta int
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DisableDeblockingFilter int
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SliceAlphaC0OffsetDiv2 int
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SliceBetaOffsetDiv2 int
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SliceGroupChangeCycle int
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RefPicListModificationFlagL0 bool
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ModificationOfPicNums int
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AbsDiffPicNumMinus1 int
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LongTermPicNum int
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RefPicListModificationFlagL1 bool
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LumaLog2WeightDenom int
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ChromaLog2WeightDenom int
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ChromaArrayType int
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LumaWeightL0Flag bool
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LumaWeightL0 []int
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LumaOffsetL0 []int
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ChromaWeightL0Flag bool
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ChromaWeightL0 [][]int
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ChromaOffsetL0 [][]int
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LumaWeightL1Flag bool
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LumaWeightL1 []int
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LumaOffsetL1 []int
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ChromaWeightL1Flag bool
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ChromaWeightL1 [][]int
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ChromaOffsetL1 [][]int
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NoOutputOfPriorPicsFlag bool
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LongTermReferenceFlag bool
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AdaptiveRefPicMarkingModeFlag bool
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MemoryManagementControlOperation int
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DifferenceOfPicNumsMinus1 int
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LongTermFrameIdx int
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MaxLongTermFrameIdxPlus1 int
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}
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type SliceData struct {
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BitReader *bits.BitReader
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CabacAlignmentOneBit int
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MbSkipRun int
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MbSkipFlag bool
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MbFieldDecodingFlag bool
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EndOfSliceFlag bool
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MbType int
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MbTypeName string
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SliceTypeName string
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PcmAlignmentZeroBit int
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PcmSampleLuma []int
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PcmSampleChroma []int
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TransformSize8x8Flag bool
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CodedBlockPattern int
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MbQpDelta int
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PrevIntra4x4PredModeFlag []int
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RemIntra4x4PredMode []int
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PrevIntra8x8PredModeFlag []int
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RemIntra8x8PredMode []int
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IntraChromaPredMode int
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RefIdxL0 []int
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RefIdxL1 []int
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MvdL0 [][][]int
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MvdL1 [][][]int
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}
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// Table 7-6
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var sliceTypeMap = map[int]string{
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0: "P",
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1: "B",
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2: "I",
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3: "SP",
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4: "SI",
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5: "P",
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6: "B",
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7: "I",
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8: "SP",
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9: "SI",
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}
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func flagVal(b bool) int {
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if b {
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return 1
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}
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return 0
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}
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// context-adaptive arithmetic entropy-coded element (CABAC)
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// 9.3
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// When parsing the slice date of a slice (7.3.4) the initialization is 9.3.1
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func (d SliceData) ae(v int) int {
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// 9.3.1.1 : CABAC context initialization ctxIdx
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return 0
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}
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// 8.2.2
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func MbToSliceGroupMap(sps *SPS, pps *PPS, header *SliceHeader) []int {
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mbaffFrameFlag := 0
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if sps.MBAdaptiveFrameField && !header.FieldPic {
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mbaffFrameFlag = 1
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}
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mapUnitToSliceGroupMap := MapUnitToSliceGroupMap(sps, pps, header)
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mbToSliceGroupMap := []int{}
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for i := 0; i <= PicSizeInMbs(sps, header)-1; i++ {
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if sps.FrameMbsOnly || header.FieldPic {
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mbToSliceGroupMap = append(mbToSliceGroupMap, mapUnitToSliceGroupMap[i])
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continue
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}
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if mbaffFrameFlag == 1 {
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mbToSliceGroupMap = append(mbToSliceGroupMap, mapUnitToSliceGroupMap[i/2])
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continue
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}
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if !sps.FrameMbsOnly && !sps.MBAdaptiveFrameField && !header.FieldPic {
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mbToSliceGroupMap = append(
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mbToSliceGroupMap,
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mapUnitToSliceGroupMap[(i/(2*PicWidthInMbs(sps)))*PicWidthInMbs(sps)+(i%PicWidthInMbs(sps))])
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}
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}
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return mbToSliceGroupMap
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}
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func PicWidthInMbs(sps *SPS) int {
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return sps.PicWidthInMbsMinus1 + 1
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}
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func PicHeightInMapUnits(sps *SPS) int {
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return sps.PicHeightInMapUnitsMinus1 + 1
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}
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func PicSizeInMapUnits(sps *SPS) int {
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return PicWidthInMbs(sps) * PicHeightInMapUnits(sps)
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}
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func FrameHeightInMbs(sps *SPS) int {
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return (2 - flagVal(sps.FrameMbsOnly)) * PicHeightInMapUnits(sps)
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}
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func PicHeightInMbs(sps *SPS, header *SliceHeader) int {
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return FrameHeightInMbs(sps) / (1 + flagVal(header.FieldPic))
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}
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func PicSizeInMbs(sps *SPS, header *SliceHeader) int {
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return PicWidthInMbs(sps) * PicHeightInMbs(sps, header)
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}
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// table 6-1
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func SubWidthC(sps *SPS) int {
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n := 17
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if sps.UseSeparateColorPlane {
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if sps.ChromaFormat == chroma444 {
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return n
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}
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}
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switch sps.ChromaFormat {
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case chromaMonochrome:
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return n
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case chroma420:
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n = 2
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case chroma422:
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n = 2
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case chroma444:
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n = 1
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}
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return n
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}
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func SubHeightC(sps *SPS) int {
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n := 17
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if sps.UseSeparateColorPlane {
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if sps.ChromaFormat == chroma444 {
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return n
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}
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}
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switch sps.ChromaFormat {
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case chromaMonochrome:
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return n
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case chroma420:
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n = 2
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case chroma422:
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n = 1
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case chroma444:
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n = 1
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}
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return n
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}
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// 7-36
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func CodedBlockPatternLuma(data *SliceData) int {
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return data.CodedBlockPattern % 16
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}
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func CodedBlockPatternChroma(data *SliceData) int {
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return data.CodedBlockPattern / 16
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}
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// dependencyId see Annex G.8.8.1
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// Also G7.3.1.1 nal_unit_header_svc_extension
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func DQId(nalUnit *NalUnit) int {
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return (nalUnit.DependencyId << 4) + nalUnit.QualityId
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}
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// Annex G p527
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func NumMbPart(nalUnit *NalUnit, sps *SPS, header *SliceHeader, data *SliceData) int {
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sliceType := sliceTypeMap[header.SliceType]
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numMbPart := 0
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if MbTypeName(sliceType, CurrMbAddr(sps, header)) == "B_SKIP" || MbTypeName(sliceType, CurrMbAddr(sps, header)) == "B_Direct_16x16" {
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if DQId(nalUnit) == 0 && nalUnit.Type != 20 {
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numMbPart = 4
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} else if DQId(nalUnit) > 0 && nalUnit.Type == 20 {
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numMbPart = 1
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}
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} else if MbTypeName(sliceType, CurrMbAddr(sps, header)) != "B_SKIP" && MbTypeName(sliceType, CurrMbAddr(sps, header)) != "B_Direct_16x16" {
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numMbPart = CurrMbAddr(sps, header)
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}
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return numMbPart
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}
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func MbPred(sliceContext *SliceContext, br *bits.BitReader, rbsp []byte) error {
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var cabac *CABAC
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sliceType := sliceTypeMap[sliceContext.Slice.Header.SliceType]
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mbPartPredMode, err := MbPartPredMode(sliceContext.Slice.Data, sliceType, sliceContext.Slice.Data.MbType, 0)
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if err != nil {
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return errors.Wrap(err, "could not get mbPartPredMode")
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}
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if mbPartPredMode == intra4x4 || mbPartPredMode == intra8x8 || mbPartPredMode == intra16x16 {
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if mbPartPredMode == intra4x4 {
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for luma4x4BlkIdx := 0; luma4x4BlkIdx < 16; luma4x4BlkIdx++ {
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var v int
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if sliceContext.PPS.EntropyCodingMode == 1 {
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// TODO: 1 bit or ae(v)
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binarization := NewBinarization(
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"PrevIntra4x4PredModeFlag",
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sliceContext.Slice.Data)
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binarization.Decode(sliceContext, br, rbsp)
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cabac = initCabac(binarization, sliceContext)
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_ = cabac
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logger.Printf("TODO: ae for PevIntra4x4PredModeFlag[%d]\n", luma4x4BlkIdx)
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} else {
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b, err := br.ReadBits(1)
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if err != nil {
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return errors.Wrap(err, "could not read PrevIntra4x4PredModeFlag")
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}
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v = int(b)
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}
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sliceContext.Slice.Data.PrevIntra4x4PredModeFlag = append(
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sliceContext.Slice.Data.PrevIntra4x4PredModeFlag,
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v)
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if sliceContext.Slice.Data.PrevIntra4x4PredModeFlag[luma4x4BlkIdx] == 0 {
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if sliceContext.PPS.EntropyCodingMode == 1 {
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// TODO: 3 bits or ae(v)
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binarization := NewBinarization(
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"RemIntra4x4PredMode",
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sliceContext.Slice.Data)
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binarization.Decode(sliceContext, br, rbsp)
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logger.Printf("TODO: ae for RemIntra4x4PredMode[%d]\n", luma4x4BlkIdx)
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} else {
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b, err := br.ReadBits(3)
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if err != nil {
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return errors.Wrap(err, "could not read RemIntra4x4PredMode")
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}
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v = int(b)
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}
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if len(sliceContext.Slice.Data.RemIntra4x4PredMode) < luma4x4BlkIdx {
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sliceContext.Slice.Data.RemIntra4x4PredMode = append(
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sliceContext.Slice.Data.RemIntra4x4PredMode,
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make([]int, luma4x4BlkIdx-len(sliceContext.Slice.Data.RemIntra4x4PredMode)+1)...)
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}
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sliceContext.Slice.Data.RemIntra4x4PredMode[luma4x4BlkIdx] = v
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}
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}
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}
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if mbPartPredMode == intra8x8 {
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for luma8x8BlkIdx := 0; luma8x8BlkIdx < 4; luma8x8BlkIdx++ {
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sliceContext.Update(sliceContext.Slice.Header, sliceContext.Slice.Data)
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var v int
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if sliceContext.PPS.EntropyCodingMode == 1 {
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// TODO: 1 bit or ae(v)
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binarization := NewBinarization("PrevIntra8x8PredModeFlag", sliceContext.Slice.Data)
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binarization.Decode(sliceContext, br, rbsp)
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logger.Printf("TODO: ae for PrevIntra8x8PredModeFlag[%d]\n", luma8x8BlkIdx)
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} else {
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b, err := br.ReadBits(1)
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if err != nil {
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return errors.Wrap(err, "could not read PrevIntra8x8PredModeFlag")
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}
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v = int(b)
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}
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sliceContext.Slice.Data.PrevIntra8x8PredModeFlag = append(
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sliceContext.Slice.Data.PrevIntra8x8PredModeFlag, v)
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if sliceContext.Slice.Data.PrevIntra8x8PredModeFlag[luma8x8BlkIdx] == 0 {
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if sliceContext.PPS.EntropyCodingMode == 1 {
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// TODO: 3 bits or ae(v)
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binarization := NewBinarization(
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"RemIntra8x8PredMode",
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sliceContext.Slice.Data)
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binarization.Decode(sliceContext, br, rbsp)
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logger.Printf("TODO: ae for RemIntra8x8PredMode[%d]\n", luma8x8BlkIdx)
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} else {
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b, err := br.ReadBits(3)
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if err != nil {
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return errors.Wrap(err, "could not read RemIntra8x8PredMode")
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}
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v = int(b)
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}
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if len(sliceContext.Slice.Data.RemIntra8x8PredMode) < luma8x8BlkIdx {
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sliceContext.Slice.Data.RemIntra8x8PredMode = append(
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sliceContext.Slice.Data.RemIntra8x8PredMode,
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make([]int, luma8x8BlkIdx-len(sliceContext.Slice.Data.RemIntra8x8PredMode)+1)...)
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}
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sliceContext.Slice.Data.RemIntra8x8PredMode[luma8x8BlkIdx] = v
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}
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}
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}
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if sliceContext.Slice.Header.ChromaArrayType == 1 || sliceContext.Slice.Header.ChromaArrayType == 2 {
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if sliceContext.PPS.EntropyCodingMode == 1 {
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// TODO: ue(v) or ae(v)
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binarization := NewBinarization(
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"IntraChromaPredMode",
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sliceContext.Slice.Data)
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binarization.Decode(sliceContext, br, rbsp)
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logger.Printf("TODO: ae for IntraChromaPredMode\n")
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} else {
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var err error
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sliceContext.Slice.Data.IntraChromaPredMode, err = readUe(br)
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if err != nil {
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return errors.Wrap(err, "could not parse IntraChromaPredMode")
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}
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}
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}
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} else if mbPartPredMode != direct {
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for mbPartIdx := 0; mbPartIdx < NumMbPart(sliceContext.NalUnit, sliceContext.SPS, sliceContext.Slice.Header, sliceContext.Slice.Data); mbPartIdx++ {
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sliceContext.Update(sliceContext.Slice.Header, sliceContext.Slice.Data)
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m, err := MbPartPredMode(sliceContext.Slice.Data, sliceType, sliceContext.Slice.Data.MbType, mbPartIdx)
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if err != nil {
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return errors.Wrap(err, fmt.Sprintf("could not get mbPartPredMode for loop 1 mbPartIdx: %d", mbPartIdx))
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}
|
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if (sliceContext.Slice.Header.NumRefIdxL0ActiveMinus1 > 0 || sliceContext.Slice.Data.MbFieldDecodingFlag != sliceContext.Slice.Header.FieldPic) && m != predL1 {
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logger.Printf("\tTODO: refIdxL0[%d] te or ae(v)\n", mbPartIdx)
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if len(sliceContext.Slice.Data.RefIdxL0) < mbPartIdx {
|
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sliceContext.Slice.Data.RefIdxL0 = append(
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sliceContext.Slice.Data.RefIdxL0, make([]int, mbPartIdx-len(sliceContext.Slice.Data.RefIdxL0)+1)...)
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}
|
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if sliceContext.PPS.EntropyCodingMode == 1 {
|
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// TODO: te(v) or ae(v)
|
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binarization := NewBinarization(
|
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"RefIdxL0",
|
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sliceContext.Slice.Data)
|
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binarization.Decode(sliceContext, br, rbsp)
|
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|
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logger.Printf("TODO: ae for RefIdxL0[%d]\n", mbPartIdx)
|
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} else {
|
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// TODO: Only one reference picture is used for inter-prediction,
|
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// then the value should be 0
|
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if MbaffFrameFlag(sliceContext.SPS, sliceContext.Slice.Header) == 0 || !sliceContext.Slice.Data.MbFieldDecodingFlag {
|
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sliceContext.Slice.Data.RefIdxL0[mbPartIdx], _ = readTe(
|
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br,
|
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uint(sliceContext.Slice.Header.NumRefIdxL0ActiveMinus1))
|
|
} else {
|
|
rangeMax := 2*sliceContext.Slice.Header.NumRefIdxL0ActiveMinus1 + 1
|
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sliceContext.Slice.Data.RefIdxL0[mbPartIdx], _ = readTe(
|
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br,
|
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uint(rangeMax))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for mbPartIdx := 0; mbPartIdx < NumMbPart(sliceContext.NalUnit, sliceContext.SPS, sliceContext.Slice.Header, sliceContext.Slice.Data); mbPartIdx++ {
|
|
m, err := MbPartPredMode(sliceContext.Slice.Data, sliceType, sliceContext.Slice.Data.MbType, mbPartIdx)
|
|
if err != nil {
|
|
return errors.Wrap(err, fmt.Sprintf("could not get mbPartPredMode for loop 2 mbPartIdx: %d", mbPartIdx))
|
|
}
|
|
if m != predL1 {
|
|
for compIdx := 0; compIdx < 2; compIdx++ {
|
|
if len(sliceContext.Slice.Data.MvdL0) < mbPartIdx {
|
|
sliceContext.Slice.Data.MvdL0 = append(
|
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sliceContext.Slice.Data.MvdL0,
|
|
make([][][]int, mbPartIdx-len(sliceContext.Slice.Data.MvdL0)+1)...)
|
|
}
|
|
if len(sliceContext.Slice.Data.MvdL0[mbPartIdx][0]) < compIdx {
|
|
sliceContext.Slice.Data.MvdL0[mbPartIdx][0] = append(
|
|
sliceContext.Slice.Data.MvdL0[mbPartIdx][0],
|
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make([]int, compIdx-len(sliceContext.Slice.Data.MvdL0[mbPartIdx][0])+1)...)
|
|
}
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
// TODO: se(v) or ae(v)
|
|
if compIdx == 0 {
|
|
binarization := NewBinarization(
|
|
"MvdLnEnd0",
|
|
sliceContext.Slice.Data)
|
|
binarization.Decode(sliceContext, br, rbsp)
|
|
|
|
} else if compIdx == 1 {
|
|
binarization := NewBinarization(
|
|
"MvdLnEnd1",
|
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sliceContext.Slice.Data)
|
|
binarization.Decode(sliceContext, br, rbsp)
|
|
|
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}
|
|
logger.Printf("TODO: ae for MvdL0[%d][0][%d]\n", mbPartIdx, compIdx)
|
|
} else {
|
|
sliceContext.Slice.Data.MvdL0[mbPartIdx][0][compIdx], _ = readSe(br)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for mbPartIdx := 0; mbPartIdx < NumMbPart(sliceContext.NalUnit, sliceContext.SPS, sliceContext.Slice.Header, sliceContext.Slice.Data); mbPartIdx++ {
|
|
sliceContext.Update(sliceContext.Slice.Header, sliceContext.Slice.Data)
|
|
m, err := MbPartPredMode(sliceContext.Slice.Data, sliceType, sliceContext.Slice.Data.MbType, mbPartIdx)
|
|
if err != nil {
|
|
return errors.Wrap(err, fmt.Sprintf("could not get mbPartPredMode for loop 3 mbPartIdx: %d", mbPartIdx))
|
|
}
|
|
if m != predL0 {
|
|
for compIdx := 0; compIdx < 2; compIdx++ {
|
|
if len(sliceContext.Slice.Data.MvdL1) < mbPartIdx {
|
|
sliceContext.Slice.Data.MvdL1 = append(
|
|
sliceContext.Slice.Data.MvdL1,
|
|
make([][][]int, mbPartIdx-len(sliceContext.Slice.Data.MvdL1)+1)...)
|
|
}
|
|
if len(sliceContext.Slice.Data.MvdL1[mbPartIdx][0]) < compIdx {
|
|
sliceContext.Slice.Data.MvdL1[mbPartIdx][0] = append(
|
|
sliceContext.Slice.Data.MvdL0[mbPartIdx][0],
|
|
make([]int, compIdx-len(sliceContext.Slice.Data.MvdL1[mbPartIdx][0])+1)...)
|
|
}
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
if compIdx == 0 {
|
|
binarization := NewBinarization(
|
|
"MvdLnEnd0",
|
|
sliceContext.Slice.Data)
|
|
binarization.Decode(sliceContext, br, rbsp)
|
|
|
|
} else if compIdx == 1 {
|
|
binarization := NewBinarization(
|
|
"MvdLnEnd1",
|
|
sliceContext.Slice.Data)
|
|
binarization.Decode(sliceContext, br, rbsp)
|
|
|
|
}
|
|
// TODO: se(v) or ae(v)
|
|
logger.Printf("TODO: ae for MvdL1[%d][0][%d]\n", mbPartIdx, compIdx)
|
|
} else {
|
|
sliceContext.Slice.Data.MvdL1[mbPartIdx][0][compIdx], _ = readSe(br)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// 8.2.2.1
|
|
func MapUnitToSliceGroupMap(sps *SPS, pps *PPS, header *SliceHeader) []int {
|
|
mapUnitToSliceGroupMap := []int{}
|
|
picSizeInMapUnits := PicSizeInMapUnits(sps)
|
|
if pps.NumSliceGroupsMinus1 == 0 {
|
|
// 0 to PicSizeInMapUnits -1 inclusive
|
|
for i := 0; i <= picSizeInMapUnits-1; i++ {
|
|
mapUnitToSliceGroupMap = append(mapUnitToSliceGroupMap, 0)
|
|
}
|
|
} else {
|
|
switch pps.SliceGroupMapType {
|
|
case 0:
|
|
// 8.2.2.1
|
|
i := 0
|
|
for i < picSizeInMapUnits {
|
|
// iGroup should be incremented in the pps.RunLengthMinus1 index operation. There may be a bug here
|
|
for iGroup := 0; iGroup <= pps.NumSliceGroupsMinus1 && i < picSizeInMapUnits; i += pps.RunLengthMinus1[iGroup+1] + 1 {
|
|
for j := 0; j < pps.RunLengthMinus1[iGroup] && i+j < picSizeInMapUnits; j++ {
|
|
if len(mapUnitToSliceGroupMap) < i+j {
|
|
mapUnitToSliceGroupMap = append(
|
|
mapUnitToSliceGroupMap,
|
|
make([]int, (i+j)-len(mapUnitToSliceGroupMap)+1)...)
|
|
}
|
|
mapUnitToSliceGroupMap[i+j] = iGroup
|
|
}
|
|
}
|
|
}
|
|
case 1:
|
|
// 8.2.2.2
|
|
for i := 0; i < picSizeInMapUnits; i++ {
|
|
v := ((i % PicWidthInMbs(sps)) + (((i / PicWidthInMbs(sps)) * (pps.NumSliceGroupsMinus1 + 1)) / 2)) % (pps.NumSliceGroupsMinus1 + 1)
|
|
mapUnitToSliceGroupMap = append(mapUnitToSliceGroupMap, v)
|
|
}
|
|
case 2:
|
|
// 8.2.2.3
|
|
for i := 0; i < picSizeInMapUnits; i++ {
|
|
mapUnitToSliceGroupMap = append(mapUnitToSliceGroupMap, pps.NumSliceGroupsMinus1)
|
|
}
|
|
for iGroup := pps.NumSliceGroupsMinus1 - 1; iGroup >= 0; iGroup-- {
|
|
yTopLeft := pps.TopLeft[iGroup] / PicWidthInMbs(sps)
|
|
xTopLeft := pps.TopLeft[iGroup] % PicWidthInMbs(sps)
|
|
yBottomRight := pps.BottomRight[iGroup] / PicWidthInMbs(sps)
|
|
xBottomRight := pps.BottomRight[iGroup] % PicWidthInMbs(sps)
|
|
for y := yTopLeft; y <= yBottomRight; y++ {
|
|
for x := xTopLeft; x <= xBottomRight; x++ {
|
|
idx := y*PicWidthInMbs(sps) + x
|
|
if len(mapUnitToSliceGroupMap) < idx {
|
|
mapUnitToSliceGroupMap = append(
|
|
mapUnitToSliceGroupMap,
|
|
make([]int, idx-len(mapUnitToSliceGroupMap)+1)...)
|
|
mapUnitToSliceGroupMap[idx] = iGroup
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
case 3:
|
|
// 8.2.2.4
|
|
// TODO
|
|
case 4:
|
|
// 8.2.2.5
|
|
// TODO
|
|
case 5:
|
|
// 8.2.2.6
|
|
// TODO
|
|
case 6:
|
|
// 8.2.2.7
|
|
// TODO
|
|
}
|
|
}
|
|
// 8.2.2.8
|
|
// Convert mapUnitToSliceGroupMap to MbToSliceGroupMap
|
|
return mapUnitToSliceGroupMap
|
|
}
|
|
func nextMbAddress(n int, sps *SPS, pps *PPS, header *SliceHeader) int {
|
|
i := n + 1
|
|
// picSizeInMbs is the number of macroblocks in picture 0
|
|
// 7-13
|
|
// PicWidthInMbs = sps.PicWidthInMbsMinus1 + 1
|
|
// PicHeightInMapUnits = sps.PicHeightInMapUnitsMinus1 + 1
|
|
// 7-29
|
|
// picSizeInMbs = PicWidthInMbs * PicHeightInMbs
|
|
// 7-26
|
|
// PicHeightInMbs = FrameHeightInMbs / (1 + header.fieldPicFlag)
|
|
// 7-18
|
|
// FrameHeightInMbs = (2 - ps.FrameMbsOnly) * PicHeightInMapUnits
|
|
picWidthInMbs := sps.PicWidthInMbsMinus1 + 1
|
|
picHeightInMapUnits := sps.PicHeightInMapUnitsMinus1 + 1
|
|
frameHeightInMbs := (2 - flagVal(sps.FrameMbsOnly)) * picHeightInMapUnits
|
|
picHeightInMbs := frameHeightInMbs / (1 + flagVal(header.FieldPic))
|
|
picSizeInMbs := picWidthInMbs * picHeightInMbs
|
|
mbToSliceGroupMap := MbToSliceGroupMap(sps, pps, header)
|
|
for i < picSizeInMbs && mbToSliceGroupMap[i] != mbToSliceGroupMap[i] {
|
|
i++
|
|
}
|
|
return i
|
|
}
|
|
|
|
func CurrMbAddr(sps *SPS, header *SliceHeader) int {
|
|
mbaffFrameFlag := 0
|
|
if sps.MBAdaptiveFrameField && !header.FieldPic {
|
|
mbaffFrameFlag = 1
|
|
}
|
|
|
|
return header.FirstMbInSlice * (1 * mbaffFrameFlag)
|
|
}
|
|
|
|
func MbaffFrameFlag(sps *SPS, header *SliceHeader) int {
|
|
if sps.MBAdaptiveFrameField && !header.FieldPic {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func NewSliceData(sliceContext *SliceContext, br *bits.BitReader) (*SliceData, error) {
|
|
var cabac *CABAC
|
|
var err error
|
|
sliceContext.Slice.Data = &SliceData{BitReader: br}
|
|
// TODO: Why is this being initialized here?
|
|
// initCabac(sliceContext)
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
for !br.ByteAligned() {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read CabacAlignmentOneBit")
|
|
}
|
|
sliceContext.Slice.Data.CabacAlignmentOneBit = int(b)
|
|
}
|
|
}
|
|
mbaffFrameFlag := 0
|
|
if sliceContext.SPS.MBAdaptiveFrameField && !sliceContext.Slice.Header.FieldPic {
|
|
mbaffFrameFlag = 1
|
|
}
|
|
currMbAddr := sliceContext.Slice.Header.FirstMbInSlice * (1 * mbaffFrameFlag)
|
|
|
|
moreDataFlag := true
|
|
prevMbSkipped := 0
|
|
sliceContext.Slice.Data.SliceTypeName = sliceTypeMap[sliceContext.Slice.Header.SliceType]
|
|
sliceContext.Slice.Data.MbTypeName = MbTypeName(sliceContext.Slice.Data.SliceTypeName, sliceContext.Slice.Data.MbType)
|
|
logger.Printf("debug: \tSliceData: Processing moreData: %v\n", moreDataFlag)
|
|
for moreDataFlag {
|
|
logger.Printf("debug: \tLooking for more sliceContext.Slice.Data in slice type %s\n", sliceContext.Slice.Data.SliceTypeName)
|
|
if sliceContext.Slice.Data.SliceTypeName != "I" && sliceContext.Slice.Data.SliceTypeName != "SI" {
|
|
logger.Printf("debug: \tNonI/SI slice, processing moreData\n")
|
|
if sliceContext.PPS.EntropyCodingMode == 0 {
|
|
sliceContext.Slice.Data.MbSkipRun, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse MbSkipRun")
|
|
}
|
|
|
|
if sliceContext.Slice.Data.MbSkipRun > 0 {
|
|
prevMbSkipped = 1
|
|
}
|
|
for i := 0; i < sliceContext.Slice.Data.MbSkipRun; i++ {
|
|
// nextMbAddress(currMbAdd
|
|
currMbAddr = nextMbAddress(currMbAddr, sliceContext.SPS, sliceContext.PPS, sliceContext.Slice.Header)
|
|
}
|
|
if sliceContext.Slice.Data.MbSkipRun > 0 {
|
|
moreDataFlag = moreRBSPData(br)
|
|
}
|
|
} else {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read MbSkipFlag")
|
|
}
|
|
sliceContext.Slice.Data.MbSkipFlag = b == 1
|
|
|
|
moreDataFlag = !sliceContext.Slice.Data.MbSkipFlag
|
|
}
|
|
}
|
|
if moreDataFlag {
|
|
if mbaffFrameFlag == 1 && (currMbAddr%2 == 0 || (currMbAddr%2 == 1 && prevMbSkipped == 1)) {
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
// TODO: ae implementation
|
|
binarization := NewBinarization("MbFieldDecodingFlag", sliceContext.Slice.Data)
|
|
// TODO: this should take a BitReader where the nil is.
|
|
binarization.Decode(sliceContext, br, nil)
|
|
|
|
logger.Printf("TODO: ae for MbFieldDecodingFlag\n")
|
|
} else {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read MbFieldDecodingFlag")
|
|
}
|
|
sliceContext.Slice.Data.MbFieldDecodingFlag = b == 1
|
|
}
|
|
}
|
|
|
|
// BEGIN: macroblockLayer()
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
// TODO: ae implementation
|
|
binarization := NewBinarization("MbType", sliceContext.Slice.Data)
|
|
cabac = initCabac(binarization, sliceContext)
|
|
_ = cabac
|
|
// TODO: remove bytes parameter from this function.
|
|
binarization.Decode(sliceContext, br, nil)
|
|
if binarization.PrefixSuffix {
|
|
logger.Printf("debug: MBType binarization has prefix and suffix\n")
|
|
}
|
|
bits := []int{}
|
|
for binIdx := 0; binarization.IsBinStringMatch(bits); binIdx++ {
|
|
newBit, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read bit")
|
|
}
|
|
if binarization.UseDecodeBypass == 1 {
|
|
// DecodeBypass
|
|
logger.Printf("TODO: decodeBypass is set: 9.3.3.2.3")
|
|
codIRange, codIOffset, err := initDecodingEngine(sliceContext.Slice.Data.BitReader)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not initialise decoding engine")
|
|
}
|
|
// Initialize the decoder
|
|
// TODO: When should the suffix of MaxBinIdxCtx be used and when just the prefix?
|
|
// TODO: When should the suffix of CtxIdxOffset be used?
|
|
arithmeticDecoder, err := NewArithmeticDecoding(
|
|
sliceContext,
|
|
binarization,
|
|
CtxIdx(
|
|
binarization.binIdx,
|
|
binarization.MaxBinIdxCtx.Prefix,
|
|
binarization.CtxIdxOffset.Prefix,
|
|
),
|
|
codIRange,
|
|
codIOffset,
|
|
)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "error from NewArithmeticDecoding")
|
|
}
|
|
// Bypass decoding
|
|
codIOffset, _, err = arithmeticDecoder.DecodeBypass(
|
|
sliceContext.Slice.Data,
|
|
codIRange,
|
|
codIOffset,
|
|
)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not DecodeBypass")
|
|
}
|
|
// End DecodeBypass
|
|
|
|
} else {
|
|
// DO 9.3.3.1
|
|
ctxIdx := CtxIdx(
|
|
binIdx,
|
|
binarization.MaxBinIdxCtx.Prefix,
|
|
binarization.CtxIdxOffset.Prefix)
|
|
if binarization.MaxBinIdxCtx.IsPrefixSuffix {
|
|
logger.Printf("TODO: Handle PrefixSuffix binarization\n")
|
|
}
|
|
logger.Printf("debug: MBType ctxIdx for %d is %d\n", binIdx, ctxIdx)
|
|
// Then 9.3.3.2
|
|
codIRange, codIOffset, err := initDecodingEngine(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "error from initDecodingEngine")
|
|
}
|
|
logger.Printf("debug: coding engine initialized: %d/%d\n", codIRange, codIOffset)
|
|
}
|
|
bits = append(bits, int(newBit))
|
|
}
|
|
|
|
logger.Printf("TODO: ae for MBType\n")
|
|
} else {
|
|
sliceContext.Slice.Data.MbType, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse MbType")
|
|
}
|
|
}
|
|
if sliceContext.Slice.Data.MbTypeName == "I_PCM" {
|
|
for !br.ByteAligned() {
|
|
_, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read PCMAlignmentZeroBit")
|
|
}
|
|
}
|
|
// 7-3 p95
|
|
bitDepthY := 8 + sliceContext.SPS.BitDepthLumaMinus8
|
|
for i := 0; i < 256; i++ {
|
|
s, err := br.ReadBits(bitDepthY)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, fmt.Sprintf("could not read PcmSampleLuma[%d]", i))
|
|
}
|
|
sliceContext.Slice.Data.PcmSampleLuma = append(
|
|
sliceContext.Slice.Data.PcmSampleLuma,
|
|
int(s))
|
|
}
|
|
// 9.3.1 p 246
|
|
// cabac = initCabac(binarization, sliceContext)
|
|
// 6-1 p 47
|
|
mbWidthC := 16 / SubWidthC(sliceContext.SPS)
|
|
mbHeightC := 16 / SubHeightC(sliceContext.SPS)
|
|
// if monochrome
|
|
if sliceContext.SPS.ChromaFormat == chromaMonochrome || sliceContext.SPS.UseSeparateColorPlane {
|
|
mbWidthC = 0
|
|
mbHeightC = 0
|
|
}
|
|
|
|
bitDepthC := 8 + sliceContext.SPS.BitDepthChromaMinus8
|
|
for i := 0; i < 2*mbWidthC*mbHeightC; i++ {
|
|
s, err := br.ReadBits(bitDepthC)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, fmt.Sprintf("could not read PcmSampleChroma[%d]", i))
|
|
}
|
|
sliceContext.Slice.Data.PcmSampleChroma = append(
|
|
sliceContext.Slice.Data.PcmSampleChroma,
|
|
int(s))
|
|
}
|
|
// 9.3.1 p 246
|
|
// cabac = initCabac(binarization, sliceContext)
|
|
|
|
} else {
|
|
noSubMbPartSizeLessThan8x8Flag := 1
|
|
m, err := MbPartPredMode(sliceContext.Slice.Data, sliceContext.Slice.Data.SliceTypeName, sliceContext.Slice.Data.MbType, 0)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not get mbPartPredMode")
|
|
}
|
|
if sliceContext.Slice.Data.MbTypeName == "I_NxN" && m != intra16x16 && NumMbPart(sliceContext.NalUnit, sliceContext.SPS, sliceContext.Slice.Header, sliceContext.Slice.Data) == 4 {
|
|
logger.Printf("\tTODO: subMbPred\n")
|
|
/*
|
|
subMbType := SubMbPred(sliceContext.Slice.Data.MbType)
|
|
for mbPartIdx := 0; mbPartIdx < 4; mbPartIdx++ {
|
|
if subMbType[mbPartIdx] != "B_Direct_8x8" {
|
|
if NumbSubMbPart(subMbType[mbPartIdx]) > 1 {
|
|
noSubMbPartSizeLessThan8x8Flag = 0
|
|
}
|
|
} else if !sliceContext.SPS.Direct8x8Inference {
|
|
noSubMbPartSizeLessThan8x8Flag = 0
|
|
}
|
|
}
|
|
*/
|
|
} else {
|
|
if sliceContext.PPS.Transform8x8Mode == 1 && sliceContext.Slice.Data.MbTypeName == "I_NxN" {
|
|
// TODO
|
|
// 1 bit or ae(v)
|
|
// If sliceContext.PPS.EntropyCodingMode == 1, use ae(v)
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
binarization := NewBinarization("TransformSize8x8Flag", sliceContext.Slice.Data)
|
|
cabac = initCabac(binarization, sliceContext)
|
|
binarization.Decode(sliceContext, br, nil)
|
|
|
|
logger.Println("TODO: ae(v) for TransformSize8x8Flag")
|
|
} else {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read TransformSize8x8Flag")
|
|
}
|
|
sliceContext.Slice.Data.TransformSize8x8Flag = b == 1
|
|
}
|
|
}
|
|
// TODO: fix nil argument for.
|
|
MbPred(sliceContext, br, nil)
|
|
}
|
|
m, err = MbPartPredMode(sliceContext.Slice.Data, sliceContext.Slice.Data.SliceTypeName, sliceContext.Slice.Data.MbType, 0)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not get mbPartPredMode")
|
|
}
|
|
if m != intra16x16 {
|
|
// TODO: me, ae
|
|
logger.Printf("TODO: CodedBlockPattern pending me/ae implementation\n")
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
binarization := NewBinarization("CodedBlockPattern", sliceContext.Slice.Data)
|
|
cabac = initCabac(binarization, sliceContext)
|
|
// TODO: fix nil argument.
|
|
binarization.Decode(sliceContext, br, nil)
|
|
|
|
logger.Printf("TODO: ae for CodedBlockPattern\n")
|
|
} else {
|
|
me, _ := readMe(
|
|
br,
|
|
uint(sliceContext.Slice.Header.ChromaArrayType),
|
|
// TODO: fix this
|
|
//MbPartPredMode(sliceContext.Slice.Data, sliceContext.Slice.Data.SliceTypeName, sliceContext.Slice.Data.MbType, 0)))
|
|
0)
|
|
sliceContext.Slice.Data.CodedBlockPattern = int(me)
|
|
}
|
|
|
|
// sliceContext.Slice.Data.CodedBlockPattern = me(v) | ae(v)
|
|
if CodedBlockPatternLuma(sliceContext.Slice.Data) > 0 && sliceContext.PPS.Transform8x8Mode == 1 && sliceContext.Slice.Data.MbTypeName != "I_NxN" && noSubMbPartSizeLessThan8x8Flag == 1 && (sliceContext.Slice.Data.MbTypeName != "B_Direct_16x16" || sliceContext.SPS.Direct8x8Inference) {
|
|
// TODO: 1 bit or ae(v)
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
binarization := NewBinarization("Transform8x8Flag", sliceContext.Slice.Data)
|
|
cabac = initCabac(binarization, sliceContext)
|
|
// TODO: fix nil argument.
|
|
binarization.Decode(sliceContext, br, nil)
|
|
|
|
logger.Printf("TODO: ae for TranformSize8x8Flag\n")
|
|
} else {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "coult not read TransformSize8x8Flag")
|
|
}
|
|
sliceContext.Slice.Data.TransformSize8x8Flag = b == 1
|
|
}
|
|
}
|
|
}
|
|
m, err = MbPartPredMode(sliceContext.Slice.Data, sliceContext.Slice.Data.SliceTypeName, sliceContext.Slice.Data.MbType, 0)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not get mbPartPredMode")
|
|
}
|
|
if CodedBlockPatternLuma(sliceContext.Slice.Data) > 0 || CodedBlockPatternChroma(sliceContext.Slice.Data) > 0 || m == intra16x16 {
|
|
// TODO: se or ae(v)
|
|
if sliceContext.PPS.EntropyCodingMode == 1 {
|
|
binarization := NewBinarization("MbQpDelta", sliceContext.Slice.Data)
|
|
cabac = initCabac(binarization, sliceContext)
|
|
// TODO; fix nil argument
|
|
binarization.Decode(sliceContext, br, nil)
|
|
|
|
logger.Printf("TODO: ae for MbQpDelta\n")
|
|
} else {
|
|
sliceContext.Slice.Data.MbQpDelta, _ = readSe(br)
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
} // END MacroblockLayer
|
|
if sliceContext.PPS.EntropyCodingMode == 0 {
|
|
moreDataFlag = moreRBSPData(br)
|
|
} else {
|
|
if sliceContext.Slice.Data.SliceTypeName != "I" && sliceContext.Slice.Data.SliceTypeName != "SI" {
|
|
if sliceContext.Slice.Data.MbSkipFlag {
|
|
prevMbSkipped = 1
|
|
} else {
|
|
prevMbSkipped = 0
|
|
}
|
|
}
|
|
if mbaffFrameFlag == 1 && currMbAddr%2 == 0 {
|
|
moreDataFlag = true
|
|
} else {
|
|
// TODO: ae implementation
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read EndOfSliceFlag")
|
|
}
|
|
sliceContext.Slice.Data.EndOfSliceFlag = b == 1
|
|
moreDataFlag = !sliceContext.Slice.Data.EndOfSliceFlag
|
|
}
|
|
}
|
|
currMbAddr = nextMbAddress(currMbAddr, sliceContext.SPS, sliceContext.PPS, sliceContext.Slice.Header)
|
|
} // END while moreDataFlag
|
|
return sliceContext.Slice.Data, nil
|
|
}
|
|
|
|
func (c *SliceContext) Update(header *SliceHeader, data *SliceData) {
|
|
c.Slice = &Slice{Header: header, Data: data}
|
|
}
|
|
func NewSliceContext(videoStream *VideoStream, nalUnit *NalUnit, rbsp []byte, showPacket bool) (*SliceContext, error) {
|
|
var err error
|
|
sps := videoStream.SPS
|
|
pps := videoStream.PPS
|
|
logger.Printf("debug: %s RBSP %d bytes %d bits == \n", NALUnitType[nalUnit.Type], len(rbsp), len(rbsp)*8)
|
|
logger.Printf("debug: \t%#v\n", rbsp[0:8])
|
|
var idrPic bool
|
|
if nalUnit.Type == 5 {
|
|
idrPic = true
|
|
}
|
|
header := SliceHeader{}
|
|
if sps.UseSeparateColorPlane {
|
|
header.ChromaArrayType = 0
|
|
} else {
|
|
header.ChromaArrayType = sps.ChromaFormat
|
|
}
|
|
br := bits.NewBitReader(bytes.NewReader(rbsp))
|
|
|
|
header.FirstMbInSlice, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse FirstMbInSlice")
|
|
}
|
|
|
|
header.SliceType, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse SliceType")
|
|
}
|
|
|
|
sliceType := sliceTypeMap[header.SliceType]
|
|
logger.Printf("debug: %s (%s) slice of %d bytes\n", NALUnitType[nalUnit.Type], sliceType, len(rbsp))
|
|
header.PPSID, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse PPSID")
|
|
}
|
|
|
|
if sps.UseSeparateColorPlane {
|
|
b, err := br.ReadBits(2)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read ColorPlaneID")
|
|
}
|
|
header.ColorPlaneID = int(b)
|
|
}
|
|
// TODO: See 7.4.3
|
|
// header.FrameNum = b.NextField("FrameNum", 0)
|
|
if !sps.FrameMbsOnly {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read FieldPic")
|
|
}
|
|
header.FieldPic = b == 1
|
|
if header.FieldPic {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read BottomField")
|
|
}
|
|
header.BottomField = b == 1
|
|
}
|
|
}
|
|
if idrPic {
|
|
header.IDRPicID, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse IDRPicID")
|
|
}
|
|
}
|
|
if sps.PicOrderCountType == 0 {
|
|
b, err := br.ReadBits(sps.Log2MaxPicOrderCntLSBMin4 + 4)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read PicOrderCntLsb")
|
|
}
|
|
header.PicOrderCntLsb = int(b)
|
|
|
|
if pps.BottomFieldPicOrderInFramePresent && !header.FieldPic {
|
|
header.DeltaPicOrderCntBottom, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse DeltaPicOrderCntBottom")
|
|
}
|
|
}
|
|
}
|
|
if sps.PicOrderCountType == 1 && !sps.DeltaPicOrderAlwaysZero {
|
|
header.DeltaPicOrderCnt[0], err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse DeltaPicOrderCnt")
|
|
}
|
|
|
|
if pps.BottomFieldPicOrderInFramePresent && !header.FieldPic {
|
|
header.DeltaPicOrderCnt[1], err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse DeltaPicOrderCnt")
|
|
}
|
|
}
|
|
}
|
|
if pps.RedundantPicCntPresent {
|
|
header.RedundantPicCnt, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse RedundantPicCnt")
|
|
}
|
|
}
|
|
if sliceType == "B" {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read DirectSpatialMvPred")
|
|
}
|
|
header.DirectSpatialMvPred = b == 1
|
|
}
|
|
if sliceType == "B" || sliceType == "SP" {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read NumRefIdxActiveOverride")
|
|
}
|
|
header.NumRefIdxActiveOverride = b == 1
|
|
|
|
if header.NumRefIdxActiveOverride {
|
|
header.NumRefIdxL0ActiveMinus1, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse NumRefIdxL0ActiveMinus1")
|
|
}
|
|
if sliceType == "B" {
|
|
header.NumRefIdxL1ActiveMinus1, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse NumRefIdxL1ActiveMinus1")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if nalUnit.Type == 20 || nalUnit.Type == 21 {
|
|
// Annex H
|
|
// H.7.3.3.1.1
|
|
// refPicListMvcModifications()
|
|
} else {
|
|
// 7.3.3.1
|
|
if header.SliceType%5 != 2 && header.SliceType%5 != 4 {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read RefPicListModificationFlagL0")
|
|
}
|
|
header.RefPicListModificationFlagL0 = b == 1
|
|
|
|
if header.RefPicListModificationFlagL0 {
|
|
for header.ModificationOfPicNums != 3 {
|
|
header.ModificationOfPicNums, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ModificationOfPicNums")
|
|
}
|
|
|
|
if header.ModificationOfPicNums == 0 || header.ModificationOfPicNums == 1 {
|
|
header.AbsDiffPicNumMinus1, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse AbsDiffPicNumMinus1")
|
|
}
|
|
} else if header.ModificationOfPicNums == 2 {
|
|
header.LongTermPicNum, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LongTermPicNum")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
if header.SliceType%5 == 1 {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read RefPicListModificationFlagL1")
|
|
}
|
|
header.RefPicListModificationFlagL1 = b == 1
|
|
|
|
if header.RefPicListModificationFlagL1 {
|
|
for header.ModificationOfPicNums != 3 {
|
|
header.ModificationOfPicNums, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ModificationOfPicNums")
|
|
}
|
|
|
|
if header.ModificationOfPicNums == 0 || header.ModificationOfPicNums == 1 {
|
|
header.AbsDiffPicNumMinus1, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse AbsDiffPicNumMinus1")
|
|
}
|
|
} else if header.ModificationOfPicNums == 2 {
|
|
header.LongTermPicNum, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LongTermPicNum")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// refPicListModification()
|
|
}
|
|
|
|
if (pps.WeightedPred && (sliceType == "P" || sliceType == "SP")) || (pps.WeightedBipred == 1 && sliceType == "B") {
|
|
// predWeightTable()
|
|
header.LumaLog2WeightDenom, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LumaLog2WeightDenom")
|
|
}
|
|
|
|
if header.ChromaArrayType != 0 {
|
|
header.ChromaLog2WeightDenom, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ChromaLog2WeightDenom")
|
|
}
|
|
}
|
|
for i := 0; i <= header.NumRefIdxL0ActiveMinus1; i++ {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read LumaWeightL0Flag")
|
|
}
|
|
header.LumaWeightL0Flag = b == 1
|
|
|
|
if header.LumaWeightL0Flag {
|
|
se, err := readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LumaWeightL0")
|
|
}
|
|
header.LumaWeightL0 = append(header.LumaWeightL0, se)
|
|
|
|
se, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LumaOffsetL0")
|
|
}
|
|
header.LumaOffsetL0 = append(header.LumaOffsetL0, se)
|
|
}
|
|
if header.ChromaArrayType != 0 {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read ChromaWeightL0Flag")
|
|
}
|
|
header.ChromaWeightL0Flag = b == 1
|
|
|
|
if header.ChromaWeightL0Flag {
|
|
header.ChromaWeightL0 = append(header.ChromaWeightL0, []int{})
|
|
header.ChromaOffsetL0 = append(header.ChromaOffsetL0, []int{})
|
|
for j := 0; j < 2; j++ {
|
|
se, err := readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ChromaWeightL0")
|
|
}
|
|
header.ChromaWeightL0[i] = append(header.ChromaWeightL0[i], se)
|
|
|
|
se, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ChromaOffsetL0")
|
|
}
|
|
header.ChromaOffsetL0[i] = append(header.ChromaOffsetL0[i], se)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if header.SliceType%5 == 1 {
|
|
for i := 0; i <= header.NumRefIdxL1ActiveMinus1; i++ {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read LumaWeightL1Flag")
|
|
}
|
|
header.LumaWeightL1Flag = b == 1
|
|
|
|
if header.LumaWeightL1Flag {
|
|
se, err := readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LumaWeightL1")
|
|
}
|
|
header.LumaWeightL1 = append(header.LumaWeightL1, se)
|
|
|
|
se, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LumaOffsetL1")
|
|
}
|
|
header.LumaOffsetL1 = append(header.LumaOffsetL1, se)
|
|
}
|
|
if header.ChromaArrayType != 0 {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read ChromaWeightL1Flag")
|
|
}
|
|
header.ChromaWeightL1Flag = b == 1
|
|
|
|
if header.ChromaWeightL1Flag {
|
|
header.ChromaWeightL1 = append(header.ChromaWeightL1, []int{})
|
|
header.ChromaOffsetL1 = append(header.ChromaOffsetL1, []int{})
|
|
for j := 0; j < 2; j++ {
|
|
se, err := readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ChromaWeightL1")
|
|
}
|
|
header.ChromaWeightL1[i] = append(header.ChromaWeightL1[i], se)
|
|
|
|
se, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse ChromaOffsetL1")
|
|
}
|
|
header.ChromaOffsetL1[i] = append(header.ChromaOffsetL1[i], se)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} // end predWeightTable
|
|
if nalUnit.RefIdc != 0 {
|
|
// devRefPicMarking()
|
|
if idrPic {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read NoOutputOfPriorPicsFlag")
|
|
}
|
|
header.NoOutputOfPriorPicsFlag = b == 1
|
|
|
|
b, err = br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read LongTermReferenceFlag")
|
|
}
|
|
header.LongTermReferenceFlag = b == 1
|
|
} else {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read AdaptiveRefPicMarkingModeFlag")
|
|
}
|
|
header.AdaptiveRefPicMarkingModeFlag = b == 1
|
|
|
|
if header.AdaptiveRefPicMarkingModeFlag {
|
|
header.MemoryManagementControlOperation, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse MemoryManagementControlOperation")
|
|
}
|
|
for header.MemoryManagementControlOperation != 0 {
|
|
if header.MemoryManagementControlOperation == 1 || header.MemoryManagementControlOperation == 3 {
|
|
header.DifferenceOfPicNumsMinus1, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse MemoryManagementControlOperation")
|
|
}
|
|
}
|
|
if header.MemoryManagementControlOperation == 2 {
|
|
header.LongTermPicNum, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LongTermPicNum")
|
|
}
|
|
}
|
|
if header.MemoryManagementControlOperation == 3 || header.MemoryManagementControlOperation == 6 {
|
|
header.LongTermFrameIdx, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse LongTermFrameIdx")
|
|
}
|
|
}
|
|
if header.MemoryManagementControlOperation == 4 {
|
|
header.MaxLongTermFrameIdxPlus1, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse MaxLongTermFrameIdxPlus1")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} // end decRefPicMarking
|
|
}
|
|
if pps.EntropyCodingMode == 1 && sliceType != "I" && sliceType != "SI" {
|
|
header.CabacInit, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse CabacInit")
|
|
}
|
|
}
|
|
header.SliceQpDelta, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse SliceQpDelta")
|
|
}
|
|
|
|
if sliceType == "SP" || sliceType == "SI" {
|
|
if sliceType == "SP" {
|
|
b, err := br.ReadBits(1)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read SpForSwitch")
|
|
}
|
|
header.SpForSwitch = b == 1
|
|
}
|
|
header.SliceQsDelta, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse SliceQsDelta")
|
|
}
|
|
}
|
|
if pps.DeblockingFilterControlPresent {
|
|
header.DisableDeblockingFilter, err = readUe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse DisableDeblockingFilter")
|
|
}
|
|
|
|
if header.DisableDeblockingFilter != 1 {
|
|
header.SliceAlphaC0OffsetDiv2, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse SliceAlphaC0OffsetDiv2")
|
|
}
|
|
|
|
header.SliceBetaOffsetDiv2, err = readSe(br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not parse SliceBetaOffsetDiv2")
|
|
}
|
|
}
|
|
}
|
|
if pps.NumSliceGroupsMinus1 > 0 && pps.SliceGroupMapType >= 3 && pps.SliceGroupMapType <= 5 {
|
|
b, err := br.ReadBits(int(math.Ceil(math.Log2(float64(pps.PicSizeInMapUnitsMinus1/pps.SliceGroupChangeRateMinus1 + 1)))))
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not read SliceGruopChangeCycle")
|
|
}
|
|
header.SliceGroupChangeCycle = int(b)
|
|
}
|
|
|
|
sliceContext := &SliceContext{
|
|
NalUnit: nalUnit,
|
|
SPS: sps,
|
|
PPS: pps,
|
|
Slice: &Slice{
|
|
Header: &header,
|
|
},
|
|
}
|
|
sliceContext.Slice.Data, err = NewSliceData(sliceContext, br)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "could not create slice data")
|
|
}
|
|
if showPacket {
|
|
debugPacket("debug: Header", sliceContext.Slice.Header)
|
|
debugPacket("debug: Data", sliceContext.Slice.Data)
|
|
}
|
|
return sliceContext, nil
|
|
}
|