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h265.go
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h265.go
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package codec
import (
"bytes"
"errors"
"github.com/Monibuca/utils/v3"
"github.com/q191201771/naza/pkg/nazabits"
)
const (
// HEVC_VPS = 0x40
// HEVC_SPS = 0x42
// HEVC_PPS = 0x44
// HEVC_SEI = 0x4E
// HEVC_IDR = 0x26
// HEVC_PSLICE = 0x02
NAL_UNIT_CODED_SLICE_TRAIL_N byte = iota // 0
NAL_UNIT_CODED_SLICE_TRAIL_R // 1
NAL_UNIT_CODED_SLICE_TSA_N // 2
NAL_UNIT_CODED_SLICE_TLA // 3 // Current name in the spec: TSA_R
NAL_UNIT_CODED_SLICE_STSA_N // 4
NAL_UNIT_CODED_SLICE_STSA_R // 5
NAL_UNIT_CODED_SLICE_RADL_N // 6
NAL_UNIT_CODED_SLICE_DLP // 7 // Current name in the spec: RADL_R
NAL_UNIT_CODED_SLICE_RASL_N // 8
NAL_UNIT_CODED_SLICE_TFD // 9 // Current name in the spec: RASL_R
NAL_UNIT_RESERVED_10
NAL_UNIT_RESERVED_11
NAL_UNIT_RESERVED_12
NAL_UNIT_RESERVED_13
NAL_UNIT_RESERVED_14
NAL_UNIT_RESERVED_15
NAL_UNIT_CODED_SLICE_BLA // 16 // Current name in the spec: BLA_W_LP
NAL_UNIT_CODED_SLICE_BLANT // 17 // Current name in the spec: BLA_W_DLP
NAL_UNIT_CODED_SLICE_BLA_N_LP // 18
NAL_UNIT_CODED_SLICE_IDR // 19// Current name in the spec: IDR_W_DLP
NAL_UNIT_CODED_SLICE_IDR_N_LP // 20
NAL_UNIT_CODED_SLICE_CRA // 21
NAL_UNIT_RESERVED_22
NAL_UNIT_RESERVED_23
NAL_UNIT_RESERVED_24
NAL_UNIT_RESERVED_25
NAL_UNIT_RESERVED_26
NAL_UNIT_RESERVED_27
NAL_UNIT_RESERVED_28
NAL_UNIT_RESERVED_29
NAL_UNIT_RESERVED_30
NAL_UNIT_RESERVED_31
NAL_UNIT_VPS // 32
NAL_UNIT_SPS // 33
NAL_UNIT_PPS // 34
NAL_UNIT_ACCESS_UNIT_DELIMITER // 35
NAL_UNIT_EOS // 36
NAL_UNIT_EOB // 37
NAL_UNIT_FILLER_DATA // 38
NAL_UNIT_SEI // 39 Prefix SEI
NAL_UNIT_SEI_SUFFIX // 40 Suffix SEI
NAL_UNIT_RESERVED_41
NAL_UNIT_RESERVED_42
NAL_UNIT_RESERVED_43
NAL_UNIT_RESERVED_44
NAL_UNIT_RESERVED_45
NAL_UNIT_RESERVED_46
NAL_UNIT_RESERVED_47
NAL_UNIT_UNSPECIFIED_48
NAL_UNIT_UNSPECIFIED_49
NAL_UNIT_UNSPECIFIED_50
NAL_UNIT_UNSPECIFIED_51
NAL_UNIT_UNSPECIFIED_52
NAL_UNIT_UNSPECIFIED_53
NAL_UNIT_UNSPECIFIED_54
NAL_UNIT_UNSPECIFIED_55
NAL_UNIT_UNSPECIFIED_56
NAL_UNIT_UNSPECIFIED_57
NAL_UNIT_UNSPECIFIED_58
NAL_UNIT_UNSPECIFIED_59
NAL_UNIT_UNSPECIFIED_60
NAL_UNIT_UNSPECIFIED_61
NAL_UNIT_UNSPECIFIED_62
NAL_UNIT_UNSPECIFIED_63
NAL_UNIT_INVALID
)
var AudNalu = []byte{0x00, 0x00, 0x00, 0x01, 0x46, 0x01, 0x10}
var ErrHevc = errors.New("m7s.hevc: fxxk")
//HVCC
type HVCDecoderConfigurationRecord struct {
PicWidthInLumaSamples uint32 // sps
PicHeightInLumaSamples uint32 // sps
configurationVersion uint8
generalProfileSpace uint8
generalTierFlag uint8
generalProfileIdc uint8
generalProfileCompatibilityFlags uint32
generalConstraintIndicatorFlags uint64
generalLevelIdc uint8
lengthSizeMinusOne uint8
numTemporalLayers uint8
temporalIdNested uint8
chromaFormat uint8
bitDepthLumaMinus8 uint8
bitDepthChromaMinus8 uint8
}
func ParseVpsSpsPpsFromSeqHeaderWithoutMalloc(payload []byte) (vps, sps, pps []byte, err error) {
if len(payload) < 5 {
return nil, nil, nil, ErrHevc
}
if payload[0] != 0x1c || payload[1] != 0x00 || payload[2] != 0 || payload[3] != 0 || payload[4] != 0 {
return nil, nil, nil, ErrHevc
}
if len(payload) < 33 {
return nil, nil, nil, ErrHevc
}
index := 27
if numOfArrays := payload[index]; numOfArrays != 3 && numOfArrays != 4 {
return nil, nil, nil, ErrHevc
}
index++
if payload[index] != byte(NAL_UNIT_VPS)&0x3f {
return nil, nil, nil, ErrHevc
}
if numNalus := int(utils.BigEndian.Uint16(payload[index+1:])); numNalus != 1 {
return nil, nil, nil, ErrHevc
}
vpsLen := int(utils.BigEndian.Uint16(payload[index+3:]))
if len(payload) < 33+vpsLen {
return nil, nil, nil, ErrHevc
}
vps = payload[index+5 : index+5+vpsLen]
index += 5 + vpsLen
if len(payload) < 38+vpsLen {
return nil, nil, nil, ErrHevc
}
if payload[index] != byte(NAL_UNIT_SPS)&0x3f {
return nil, nil, nil, ErrHevc
}
if numNalus := int(utils.BigEndian.Uint16(payload[index+1:])); numNalus != 1 {
return nil, nil, nil, ErrHevc
}
spsLen := int(utils.BigEndian.Uint16(payload[index+3:]))
if len(payload) < 38+vpsLen+spsLen {
return nil, nil, nil, ErrHevc
}
sps = payload[index+5 : index+5+spsLen]
index += 5 + spsLen
if len(payload) < 43+vpsLen+spsLen {
return nil, nil, nil, ErrHevc
}
if payload[index] != byte(NAL_UNIT_PPS)&0x3f {
return nil, nil, nil, ErrHevc
}
if numNalus := int(utils.BigEndian.Uint16(payload[index+1:])); numNalus != 1 {
return nil, nil, nil, ErrHevc
}
ppsLen := int(utils.BigEndian.Uint16(payload[index+3:]))
if len(payload) < 43+vpsLen+spsLen+ppsLen {
return nil, nil, nil, ErrHevc
}
pps = payload[index+5 : index+5+ppsLen]
return
}
func BuildH265SeqHeaderFromVpsSpsPps(vps, sps, pps []byte) ([]byte, error) {
sh := make([]byte, 43+len(vps)+len(sps)+len(pps))
sh[0] = 0x1c
sh[1] = 0x0
sh[2] = 0x0
sh[3] = 0x0
sh[4] = 0x0
// unsigned int(8) configurationVersion = 1;
sh[5] = 0x1
ctx := HVCDecoderConfigurationRecord{
configurationVersion: 1,
lengthSizeMinusOne: 3, // 4 bytes
generalProfileCompatibilityFlags: 0xffffffff,
generalConstraintIndicatorFlags: 0xffffffffffff,
}
if err := ctx.ParseVps(vps); err != nil {
return nil, err
}
if err := ctx.ParseSps(sps); err != nil {
return nil, err
}
// unsigned int(2) general_profile_space;
// unsigned int(1) general_tier_flag;
// unsigned int(5) general_profile_idc;
sh[6] = ctx.generalProfileSpace<<6 | ctx.generalTierFlag<<5 | ctx.generalProfileIdc
// unsigned int(32) general_profile_compatibility_flags
utils.BigEndian.PutUint32(sh[7:], ctx.generalProfileCompatibilityFlags)
// unsigned int(48) general_constraint_indicator_flags
utils.BigEndian.PutUint32(sh[11:], uint32(ctx.generalConstraintIndicatorFlags>>16))
utils.BigEndian.PutUint16(sh[15:], uint16(ctx.generalConstraintIndicatorFlags))
// unsigned int(8) general_level_idc;
sh[17] = ctx.generalLevelIdc
// bit(4) reserved = ‘1111’b;
// unsigned int(12) min_spatial_segmentation_idc;
// bit(6) reserved = ‘111111’b;
// unsigned int(2) parallelismType;
// TODO chef: 这两个字段没有解析
utils.BigEndian.PutUint16(sh[18:], 0xf000)
sh[20] = 0xfc
// bit(6) reserved = ‘111111’b;
// unsigned int(2) chromaFormat;
sh[21] = ctx.chromaFormat | 0xfc
// bit(5) reserved = ‘11111’b;
// unsigned int(3) bitDepthLumaMinus8;
sh[22] = ctx.bitDepthLumaMinus8 | 0xf8
// bit(5) reserved = ‘11111’b;
// unsigned int(3) bitDepthChromaMinus8;
sh[23] = ctx.bitDepthChromaMinus8 | 0xf8
// bit(16) avgFrameRate;
utils.BigEndian.PutUint16(sh[24:], 0)
// bit(2) constantFrameRate;
// bit(3) numTemporalLayers;
// bit(1) temporalIdNested;
// unsigned int(2) lengthSizeMinusOne;
sh[26] = 0<<6 | ctx.numTemporalLayers<<3 | ctx.temporalIdNested<<2 | ctx.lengthSizeMinusOne
// num of vps sps pps
sh[27] = 0x03
i := 28
sh[i] = byte(NAL_UNIT_VPS)
// num of vps
utils.BigEndian.PutUint16(sh[i+1:], 1)
// length
utils.BigEndian.PutUint16(sh[i+3:], uint16(len(vps)))
copy(sh[i+5:], vps)
i = i + 5 + len(vps)
sh[i] = byte(NAL_UNIT_SPS)
utils.BigEndian.PutUint16(sh[i+1:], 1)
utils.BigEndian.PutUint16(sh[i+3:], uint16(len(sps)))
copy(sh[i+5:], sps)
i = i + 5 + len(sps)
sh[i] = byte(NAL_UNIT_PPS)
utils.BigEndian.PutUint16(sh[i+1:], 1)
utils.BigEndian.PutUint16(sh[i+3:], uint16(len(pps)))
copy(sh[i+5:], pps)
return sh, nil
}
func (ctx *HVCDecoderConfigurationRecord) ParseVps(vps []byte) error {
if len(vps) < 2 {
return ErrHevc
}
rbsp := nal2rbsp(vps[2:])
br := nazabits.NewBitReader(rbsp)
// skip
// vps_video_parameter_set_id u(4)
// vps_reserved_three_2bits u(2)
// vps_max_layers_minus1 u(6)
if _, err := br.ReadBits16(12); err != nil {
return ErrHevc
}
vpsMaxSubLayersMinus1, err := br.ReadBits8(3)
if err != nil {
return ErrHevc
}
if vpsMaxSubLayersMinus1+1 > ctx.numTemporalLayers {
ctx.numTemporalLayers = vpsMaxSubLayersMinus1 + 1
}
// skip
// vps_temporal_id_nesting_flag u(1)
// vps_reserved_0xffff_16bits u(16)
if _, err := br.ReadBits32(17); err != nil {
return ErrHevc
}
return ctx.parsePtl(&br, vpsMaxSubLayersMinus1)
}
func (ctx *HVCDecoderConfigurationRecord) ParseSps(sps []byte) error {
var err error
if len(sps) < 2 {
return ErrHevc
}
rbsp := nal2rbsp(sps[2:])
br := nazabits.NewBitReader(rbsp)
// sps_video_parameter_set_id
if _, err = br.ReadBits8(4); err != nil {
return err
}
spsMaxSubLayersMinus1, err := br.ReadBits8(3)
if err != nil {
return err
}
if spsMaxSubLayersMinus1+1 > ctx.numTemporalLayers {
ctx.numTemporalLayers = spsMaxSubLayersMinus1 + 1
}
// sps_temporal_id_nesting_flag
if ctx.temporalIdNested, err = br.ReadBit(); err != nil {
return err
}
if err = ctx.parsePtl(&br, spsMaxSubLayersMinus1); err != nil {
return err
}
// sps_seq_parameter_set_id
if _, err = br.ReadGolomb(); err != nil {
return err
}
var cf uint32
if cf, err = br.ReadGolomb(); err != nil {
return err
}
ctx.chromaFormat = uint8(cf)
if ctx.chromaFormat == 3 {
if _, err = br.ReadBit(); err != nil {
return err
}
}
if ctx.PicWidthInLumaSamples, err = br.ReadGolomb(); err != nil {
return err
}
if ctx.PicHeightInLumaSamples, err = br.ReadGolomb(); err != nil {
return err
}
conformanceWindowFlag, err := br.ReadBit()
if err != nil {
return err
}
if conformanceWindowFlag != 0 {
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
}
var bdlm8 uint32
if bdlm8, err = br.ReadGolomb(); err != nil {
return err
}
ctx.bitDepthChromaMinus8 = uint8(bdlm8)
var bdcm8 uint32
if bdcm8, err = br.ReadGolomb(); err != nil {
return err
}
ctx.bitDepthChromaMinus8 = uint8(bdcm8)
_, err = br.ReadGolomb()
if err != nil {
return err
}
spsSubLayerOrderingInfoPresentFlag, err := br.ReadBit()
if err != nil {
return err
}
var i uint8
if spsSubLayerOrderingInfoPresentFlag != 0 {
i = 0
} else {
i = spsMaxSubLayersMinus1
}
for ; i <= spsMaxSubLayersMinus1; i++ {
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
if _, err = br.ReadGolomb(); err != nil {
return err
}
return nil
}
func (ctx *HVCDecoderConfigurationRecord) parsePtl(br *nazabits.BitReader, maxSubLayersMinus1 uint8) error {
var err error
var ptl HVCDecoderConfigurationRecord
if ptl.generalProfileSpace, err = br.ReadBits8(2); err != nil {
return err
}
if ptl.generalTierFlag, err = br.ReadBit(); err != nil {
return err
}
if ptl.generalProfileIdc, err = br.ReadBits8(5); err != nil {
return err
}
if ptl.generalProfileCompatibilityFlags, err = br.ReadBits32(32); err != nil {
return err
}
if ptl.generalConstraintIndicatorFlags, err = br.ReadBits64(48); err != nil {
return err
}
if ptl.generalLevelIdc, err = br.ReadBits8(8); err != nil {
return err
}
ctx.updatePtl(&ptl)
if maxSubLayersMinus1 == 0 {
return nil
}
subLayerProfilePresentFlag := make([]uint8, maxSubLayersMinus1)
subLayerLevelPresentFlag := make([]uint8, maxSubLayersMinus1)
for i := uint8(0); i < maxSubLayersMinus1; i++ {
if subLayerProfilePresentFlag[i], err = br.ReadBit(); err != nil {
return err
}
if subLayerLevelPresentFlag[i], err = br.ReadBit(); err != nil {
return err
}
}
if maxSubLayersMinus1 > 0 {
for i := maxSubLayersMinus1; i < 8; i++ {
if _, err = br.ReadBits8(2); err != nil {
return err
}
}
}
for i := uint8(0); i < maxSubLayersMinus1; i++ {
if subLayerProfilePresentFlag[i] != 0 {
if _, err = br.ReadBits32(32); err != nil {
return err
}
if _, err = br.ReadBits32(32); err != nil {
return err
}
if _, err = br.ReadBits32(24); err != nil {
return err
}
}
if subLayerLevelPresentFlag[i] != 0 {
if _, err = br.ReadBits8(8); err != nil {
return err
}
}
}
return nil
}
func (ctx *HVCDecoderConfigurationRecord) updatePtl(ptl *HVCDecoderConfigurationRecord) {
ctx.generalProfileSpace = ptl.generalProfileSpace
if ptl.generalTierFlag > ctx.generalTierFlag {
ctx.generalLevelIdc = ptl.generalLevelIdc
ctx.generalTierFlag = ptl.generalTierFlag
} else {
if ptl.generalLevelIdc > ctx.generalLevelIdc {
ctx.generalLevelIdc = ptl.generalLevelIdc
}
}
if ptl.generalProfileIdc > ctx.generalProfileIdc {
ctx.generalProfileIdc = ptl.generalProfileIdc
}
ctx.generalProfileCompatibilityFlags &= ptl.generalProfileCompatibilityFlags
ctx.generalConstraintIndicatorFlags &= ptl.generalConstraintIndicatorFlags
}
func nal2rbsp(nal []byte) []byte {
// TODO chef:
// 1. 输出应该可由外部申请
// 2. 替换性能
// 3. 该函数应该放入avc中
return bytes.Replace(nal, []byte{0x0, 0x0, 0x3}, []byte{0x0, 0x0}, -1)
}