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https://github.com/wader/fq.git
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105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
package mpeg
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/bitio"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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var hevcVPSGroup decode.Group
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var hevcPPSGroup decode.Group
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var hevcSPSGroup decode.Group
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func init() {
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interp.RegisterFormat(
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format.HEVC_NALU,
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&decode.Format{
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Description: "H.265/HEVC Network Access Layer Unit",
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DecodeFn: hevcNALUDecode,
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Dependencies: []decode.Dependency{
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{Groups: []*decode.Group{format.HEVC_VPS}, Out: &hevcVPSGroup},
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{Groups: []*decode.Group{format.HEVC_PPS}, Out: &hevcPPSGroup},
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{Groups: []*decode.Group{format.HEVC_SPS}, Out: &hevcSPSGroup},
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},
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})
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}
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const (
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hevcNALNUTVPS = 32
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hevcNALNUTSPS = 33
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hevcNALNUTPPS = 34
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)
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var hevcNALNames = scalar.UintMapSymStr{
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0: "TRAIL_N",
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1: "TRAIL_R",
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2: "TSA_N",
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3: "TSA_R",
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4: "STSA_N",
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5: "STSA_R",
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6: "RADL_N",
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7: "RADL_R",
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8: "RASL_N",
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9: "RASL_R",
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10: "RSV_VCL_N10",
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12: "RSV_VCL_N12",
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14: "RSV_VCL_N14",
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11: "RSV_VCL_R11",
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13: "RSV_VCL_R13",
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15: "RSV_VCL_R15",
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16: "BLA_W_LP",
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17: "BLA_W_RADL",
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18: "BLA_N_LP",
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19: "IDR_W_RADL",
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20: "IDR_N_LP",
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21: "CRA_NUT",
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22: "RSV_IRAP_VCL22",
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23: "RSV_IRAP_VCL23",
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24: "RSV_VCL24",
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25: "RSV_VCL25",
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26: "RSV_VCL26",
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27: "RSV_VCL27",
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28: "RSV_VCL28",
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29: "RSV_VCL29",
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30: "RSV_VCL30",
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31: "RSV_VCL31",
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hevcNALNUTVPS: "VPS_NUT",
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hevcNALNUTSPS: "SPS_NUT",
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hevcNALNUTPPS: "PPS_NUT",
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35: "AUD_NUT",
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36: "EOS_NUT",
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37: "EOB_NUT",
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38: "FD_NUT",
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39: "PREFIX_SEI_NUT",
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40: "SUFFIX_SEI_NUT",
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41: "RSV_NVCL41",
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42: "RSV_NVCL42",
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43: "RSV_NVCL43",
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44: "RSV_NVCL44",
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45: "RSV_NVCL45",
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46: "RSV_NVCL46",
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47: "RSV_NVCL47",
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}
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func hevcNALUDecode(d *decode.D) any {
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d.FieldBool("forbidden_zero_bit")
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nalType := d.FieldU6("nal_unit_type", hevcNALNames)
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d.FieldU6("nuh_layer_id")
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d.FieldU3("nuh_temporal_id_plus1")
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unescapedBR := d.NewBitBufFromReader(nalUnescapeReader{Reader: bitio.NewIOReader(d.BitBufRange(d.Pos(), d.BitsLeft()))})
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switch nalType {
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case hevcNALNUTVPS:
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d.FieldFormatBitBuf("vps", unescapedBR, &hevcVPSGroup, nil)
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case hevcNALNUTPPS:
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d.FieldFormatBitBuf("pps", unescapedBR, &hevcPPSGroup, nil)
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case hevcNALNUTSPS:
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d.FieldFormatBitBuf("sps", unescapedBR, &hevcSPSGroup, nil)
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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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