// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT

package codecs

import (
	"reflect"
	"testing"
)

func TestH265_NALU_Header(t *testing.T) {
	tt := [...]struct {
		RawHeader []byte

		FBit    bool
		Type    uint8
		LayerID uint8
		TID     uint8

		IsAP   bool
		IsFU   bool
		IsPACI bool
	}{
		// FBit
		{
			RawHeader: []byte{0x80, 0x00},
			Type:      0,
			LayerID:   0,
			TID:       0,
			FBit:      true,
		},
		// VPS_NUT
		{
			RawHeader: []byte{0x40, 0x01},
			Type:      32,
			LayerID:   0,
			TID:       1,
		},
		// SPS_NUT
		{
			RawHeader: []byte{0x42, 0x01},
			Type:      33,
			LayerID:   0,
			TID:       1,
		},
		// PPS_NUT
		{
			RawHeader: []byte{0x44, 0x01},
			Type:      34,
			LayerID:   0,
			TID:       1,
		},
		// PREFIX_SEI_NUT
		{
			RawHeader: []byte{0x4e, 0x01},
			Type:      39,
			LayerID:   0,
			TID:       1,
		},
		// Fragmentation Unit
		{
			RawHeader: []byte{0x62, 0x01},
			Type:      h265NaluFragmentationUnitType,
			LayerID:   0,
			TID:       1,
			IsFU:      true,
		},
	}

	for _, cur := range tt {
		header := newH265NALUHeader(cur.RawHeader[0], cur.RawHeader[1])

		if header.F() != cur.FBit {
			t.Fatal("invalid F bit")
		}

		if header.Type() != cur.Type {
			t.Fatal("invalid Type")
		}

		// For any type < 32, NAL is a VLC NAL unit.
		if header.IsTypeVCLUnit() != (header.Type() < 32) {
			t.Fatal("invalid IsTypeVCLUnit")
		}

		if header.IsAggregationPacket() != cur.IsAP {
			t.Fatal("invalid Type (aggregation packet)")
		}

		if header.IsFragmentationUnit() != cur.IsFU {
			t.Fatal("invalid Type (fragmentation unit)")
		}

		if header.IsPACIPacket() != cur.IsPACI {
			t.Fatal("invalid Type (PACI)")
		}

		if header.LayerID() != cur.LayerID {
			t.Fatal("invalid LayerID")
		}

		if header.TID() != cur.TID {
			t.Fatal("invalid TID")
		}
	}
}

func TestH265_FU_Header(t *testing.T) {
	tt := [...]struct {
		header H265FragmentationUnitHeader

		S    bool
		E    bool
		Type uint8
	}{
		// Start | IDR_W_RADL
		{
			header: H265FragmentationUnitHeader(0x93),
			S:      true,
			E:      false,
			Type:   19,
		},
		// Continuation | IDR_W_RADL
		{
			header: H265FragmentationUnitHeader(0x13),
			S:      false,
			E:      false,
			Type:   19,
		},
		// End | IDR_W_RADL
		{
			header: H265FragmentationUnitHeader(0x53),
			S:      false,
			E:      true,
			Type:   19,
		},
		// Start | TRAIL_R
		{
			header: H265FragmentationUnitHeader(0x81),
			S:      true,
			E:      false,
			Type:   1,
		},
		// Continuation | TRAIL_R
		{
			header: H265FragmentationUnitHeader(0x01),
			S:      false,
			E:      false,
			Type:   1,
		},
		// End | TRAIL_R
		{
			header: H265FragmentationUnitHeader(0x41),
			S:      false,
			E:      true,
			Type:   1,
		},
	}

	for _, cur := range tt {
		if cur.header.S() != cur.S {
			t.Fatal("invalid S field")
		}

		if cur.header.E() != cur.E {
			t.Fatal("invalid E field")
		}

		if cur.header.FuType() != cur.Type {
			t.Fatal("invalid FuType field")
		}
	}
}

func TestH265_SingleNALUnitPacket(t *testing.T) { //nolint:cyclop
	tt := [...]struct {
		Raw            []byte
		WithDONL       bool
		ExpectedPacket *H265SingleNALUnitPacket
		ExpectedErr    error
	}{
		{
			Raw:         nil,
			ExpectedErr: errNilPacket,
		},
		{
			Raw:         []byte{},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62, 0x01, 0x93},
			ExpectedErr: errShortPacket,
		},
		// FBit enabled in H265NALUHeader
		{
			Raw:         []byte{0x80, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errH265CorruptedPacket,
		},
		// Type '49' in H265NALUHeader
		{
			Raw:         []byte{0x62, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errInvalidH265PacketType,
		},
		// Type '50' in H265NALUHeader
		{
			Raw:         []byte{0x64, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errInvalidH265PacketType,
		},
		{
			Raw: []byte{0x01, 0x01, 0xab, 0xcd, 0xef},
			ExpectedPacket: &H265SingleNALUnitPacket{
				payloadHeader: newH265NALUHeader(0x01, 0x01),
				payload:       []byte{0xab, 0xcd, 0xef},
			},
		},
		// DONL, payload too small
		{
			Raw:         []byte{0x01, 0x01, 0x93, 0xaf},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		{
			Raw: []byte{0x01, 0x01, 0xaa, 0xbb, 0xcc},
			ExpectedPacket: &H265SingleNALUnitPacket{
				payloadHeader: newH265NALUHeader(0x01, 0x01),
				donl:          uint16ptr((uint16(0xaa) << 8) | uint16(0xbb)),
				payload:       []byte{0xcc},
			},
			WithDONL: true,
		},
	}

	for _, cur := range tt {
		parsed := &H265SingleNALUnitPacket{}
		if cur.WithDONL {
			parsed.WithDONL(cur.WithDONL)
		}

		// Just for code coverage sake
		parsed.isH265Packet()

		_, err := parsed.Unmarshal(cur.Raw)

		if cur.ExpectedErr != nil && err == nil {
			t.Fatal("should error")
		} else if cur.ExpectedErr == nil && err != nil {
			t.Fatal("should not error")
		}

		if cur.ExpectedPacket == nil {
			continue
		}

		if cur.ExpectedPacket.PayloadHeader() != parsed.PayloadHeader() {
			t.Fatal("invalid payload header")
		}

		if cur.ExpectedPacket.DONL() != nil && (*parsed.DONL() != *cur.ExpectedPacket.DONL()) {
			t.Fatal("invalid DONL")
		}

		if !reflect.DeepEqual(cur.ExpectedPacket.Payload(), parsed.Payload()) {
			t.Fatal("invalid payload")
		}
	}
}

func TestH265_AggregationPacket(t *testing.T) { //nolint:cyclop
	tt := [...]struct {
		Raw            []byte
		WithDONL       bool
		ExpectedPacket *H265AggregationPacket
		ExpectedErr    error
	}{
		{
			Raw:         nil,
			ExpectedErr: errNilPacket,
		},
		{
			Raw:         []byte{},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62, 0x01, 0x93},
			ExpectedErr: errShortPacket,
		},
		// FBit enabled in H265NALUHeader
		{
			Raw:         []byte{0x80, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errH265CorruptedPacket,
		},
		// Type '48' in H265NALUHeader
		{
			Raw:         []byte{0xE0, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errInvalidH265PacketType,
		},
		// Small payload
		{
			Raw:         []byte{0x60, 0x01, 0x00, 0x1},
			ExpectedErr: errShortPacket,
		},
		// Small payload
		{
			Raw:         []byte{0x60, 0x01, 0x00},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Small payload
		{
			Raw:         []byte{0x60, 0x01, 0x00, 0x1},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Small payload
		{
			Raw:         []byte{0x60, 0x01, 0x00, 0x01, 0x02},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Single Aggregation Unit
		{
			Raw:         []byte{0x60, 0x01, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Incomplete second Aggregation Unit
		{
			Raw: []byte{
				0x60, 0x01, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00,
				// DONL
				0x00,
			},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Incomplete second Aggregation Unit
		{
			Raw: []byte{
				0x60, 0x01, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00,
				// DONL, NAL Unit size (2 bytes)
				0x00, 0x55, 0x55,
			},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Valid Second Aggregation Unit
		{
			Raw: []byte{
				0x60, 0x01, 0xcc, 0xdd, 0x00, 0x02, 0xff, 0xee,
				// DONL, NAL Unit size (2 bytes), Payload
				0x77, 0x00, 0x01, 0xaa,
			},
			WithDONL: true,
			ExpectedPacket: &H265AggregationPacket{
				firstUnit: &H265AggregationUnitFirst{
					donl:        uint16ptr(0xccdd),
					nalUnitSize: 2,
					nalUnit:     []byte{0xff, 0xee},
				},
				otherUnits: []H265AggregationUnit{
					{
						dond:        uint8ptr(0x77),
						nalUnitSize: 1,
						nalUnit:     []byte{0xaa},
					},
				},
			},
		},
	}

	for _, cur := range tt {
		parsed := &H265AggregationPacket{}
		if cur.WithDONL {
			parsed.WithDONL(cur.WithDONL)
		}

		// Just for code coverage sake
		parsed.isH265Packet()

		_, err := parsed.Unmarshal(cur.Raw)

		if cur.ExpectedErr != nil && err == nil {
			t.Fatal("should error")
		} else if cur.ExpectedErr == nil && err != nil {
			t.Fatal("should not error")
		}

		if cur.ExpectedPacket == nil {
			continue
		}

		if cur.ExpectedPacket.FirstUnit() != nil {
			if parsed.FirstUnit().NALUSize() != cur.ExpectedPacket.FirstUnit().NALUSize() {
				t.Fatal("invalid first unit NALUSize")
			}

			if cur.ExpectedPacket.FirstUnit().DONL() != nil &&
				*cur.ExpectedPacket.FirstUnit().DONL() != *parsed.FirstUnit().DONL() {
				t.Fatal("invalid first unit DONL")
			}

			if !reflect.DeepEqual(cur.ExpectedPacket.FirstUnit().NalUnit(), parsed.FirstUnit().NalUnit()) {
				t.Fatal("invalid first unit NalUnit")
			}
		}

		if len(cur.ExpectedPacket.OtherUnits()) != len(parsed.OtherUnits()) {
			t.Fatal("number of other units mismatch")
		}

		for ndx, unit := range cur.ExpectedPacket.OtherUnits() {
			if parsed.OtherUnits()[ndx].NALUSize() != unit.NALUSize() {
				t.Fatal("invalid unit NALUSize")
			}

			if unit.DOND() != nil && *unit.DOND() != *parsed.OtherUnits()[ndx].DOND() {
				t.Fatal("invalid unit DOND")
			}

			if !reflect.DeepEqual(unit.NalUnit(), parsed.OtherUnits()[ndx].NalUnit()) {
				t.Fatal("invalid first unit NalUnit")
			}
		}

		if !reflect.DeepEqual(cur.ExpectedPacket.OtherUnits(), parsed.OtherUnits()) {
			t.Fatal("invalid payload")
		}
	}
}

func TestH265_FragmentationUnitPacket(t *testing.T) { //nolint:cyclop
	tt := [...]struct {
		Raw         []byte
		WithDONL    bool
		ExpectedFU  *H265FragmentationUnitPacket
		ExpectedErr error
	}{
		{
			Raw:         nil,
			ExpectedErr: errNilPacket,
		},
		{
			Raw:         []byte{},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62, 0x01},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62, 0x01, 0x93},
			ExpectedErr: errShortPacket,
		},
		// FBit enabled in H265NALUHeader
		{
			Raw:         []byte{0x80, 0x01, 0x93, 0xaf},
			ExpectedErr: errH265CorruptedPacket,
		},
		// Type not '49' in H265NALUHeader
		{
			Raw:         []byte{0x40, 0x01, 0x93, 0xaf},
			ExpectedErr: errInvalidH265PacketType,
		},
		{
			Raw: []byte{0x62, 0x01, 0x93, 0xaf},
			ExpectedFU: &H265FragmentationUnitPacket{
				payloadHeader: newH265NALUHeader(0x62, 0x01),
				fuHeader:      H265FragmentationUnitHeader(0x93),
				donl:          nil,
				payload:       []byte{0xaf},
			},
		},
		{
			Raw:         []byte{0x62, 0x01, 0x93, 0xcc},
			WithDONL:    true,
			ExpectedErr: errShortPacket,
		},
		{
			Raw:      []byte{0x62, 0x01, 0x93, 0xcc, 0xdd, 0xaf, 0x0d, 0x5a},
			WithDONL: true,
			ExpectedFU: &H265FragmentationUnitPacket{
				payloadHeader: newH265NALUHeader(0x62, 0x01),
				fuHeader:      H265FragmentationUnitHeader(0x93),
				donl:          uint16ptr((uint16(0xcc) << 8) | uint16(0xdd)),
				payload:       []byte{0xaf, 0x0d, 0x5a},
			},
		},
	}

	for _, cur := range tt {
		parsed := &H265FragmentationUnitPacket{}
		if cur.WithDONL {
			parsed.WithDONL(cur.WithDONL)
		}

		// Just for code coverage sake
		parsed.isH265Packet()

		_, err := parsed.Unmarshal(cur.Raw)

		if cur.ExpectedErr != nil && err == nil {
			t.Fatal("should error")
		} else if cur.ExpectedErr == nil && err != nil {
			t.Fatal("should not error")
		}

		if cur.ExpectedFU == nil {
			continue
		}

		if parsed.PayloadHeader() != cur.ExpectedFU.PayloadHeader() {
			t.Fatal("invalid payload header")
		}

		if parsed.FuHeader() != cur.ExpectedFU.FuHeader() {
			t.Fatal("invalid FU header")
		}

		if cur.ExpectedFU.DONL() != nil && (*parsed.DONL() != *cur.ExpectedFU.DONL()) {
			t.Fatal("invalid DONL")
		}

		if !reflect.DeepEqual(parsed.Payload(), cur.ExpectedFU.Payload()) {
			t.Fatal("invalid Payload")
		}
	}
}

func TestH265_TemporalScalabilityControlInformation(t *testing.T) {
	tt := [...]struct {
		Value             H265TSCI
		ExpectedTL0PICIDX uint8
		ExpectedIrapPicID uint8
		ExpectedS         bool
		ExpectedE         bool
		ExpectedRES       uint8
	}{
		{},
		{
			Value:             H265TSCI((uint32(0xCA) << 24) | (uint32(0xFE) << 16)),
			ExpectedTL0PICIDX: 0xCA,
			ExpectedIrapPicID: 0xFE,
		},
		{
			Value:     H265TSCI(uint32(1) << 15),
			ExpectedS: true,
		},
		{
			Value:     H265TSCI(uint32(1) << 14),
			ExpectedE: true,
		},
		{
			Value:       H265TSCI(uint32(0x0A) << 8),
			ExpectedRES: 0x0A,
		},
		// Sets RES, and force sets S and E to 0.
		{
			Value:       H265TSCI((uint32(0xAA) << 8) & ^(uint32(1) << 15) & ^(uint32(1) << 14)),
			ExpectedRES: 0xAA & 0b00111111,
		},
	}

	for _, cur := range tt {
		if cur.Value.TL0PICIDX() != cur.ExpectedTL0PICIDX {
			t.Fatal("invalid TL0PICIDX")
		}

		if cur.Value.IrapPicID() != cur.ExpectedIrapPicID {
			t.Fatal("invalid IrapPicID")
		}

		if cur.Value.S() != cur.ExpectedS {
			t.Fatal("invalid S")
		}

		if cur.Value.E() != cur.ExpectedE {
			t.Fatal("invalid E")
		}

		if cur.Value.RES() != cur.ExpectedRES {
			t.Fatal("invalid RES")
		}
	}
}

func TestH265_PACI_Packet(t *testing.T) { //nolint:cyclop
	tt := [...]struct {
		Raw         []byte
		ExpectedFU  *H265PACIPacket
		ExpectedErr error
	}{
		{
			Raw:         nil,
			ExpectedErr: errNilPacket,
		},
		{
			Raw:         []byte{},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62, 0x01, 0x93},
			ExpectedErr: errShortPacket,
		},
		// FBit enabled in H265NALUHeader
		{
			Raw:         []byte{0x80, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errH265CorruptedPacket,
		},
		// Type not '50' in H265NALUHeader
		{
			Raw:         []byte{0x40, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errInvalidH265PacketType,
		},
		// Invalid header extension size
		{
			Raw:         []byte{0x64, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errInvalidH265PacketType,
		},
		// No Header Extension
		{
			Raw: []byte{0x64, 0x01, 0x64, 0x00, 0xab, 0xcd, 0xef},
			ExpectedFU: &H265PACIPacket{
				payloadHeader:    newH265NALUHeader(0x64, 0x01),
				paciHeaderFields: (uint16(0x64) << 8) | uint16(0x00),
				phes:             nil,
				payload:          []byte{0xab, 0xcd, 0xef},
			},
		},
		// Header Extension 1 byte
		{
			Raw: []byte{0x64, 0x01, 0x64, 0x10, 0xff, 0xab, 0xcd, 0xef},
			ExpectedFU: &H265PACIPacket{
				payloadHeader:    newH265NALUHeader(0x64, 0x01),
				paciHeaderFields: (uint16(0x64) << 8) | uint16(0x10),
				phes:             []byte{0xff},
				payload:          []byte{0xab, 0xcd, 0xef},
			},
		},
		// Header Extension TSCI
		{
			Raw: []byte{0x64, 0x01, 0x64, 0b00111000, 0xaa, 0xbb, 0x80, 0xab, 0xcd, 0xef},
			ExpectedFU: &H265PACIPacket{
				payloadHeader:    newH265NALUHeader(0x64, 0x01),
				paciHeaderFields: (uint16(0x64) << 8) | uint16(0b00111000),
				phes:             []byte{0xaa, 0xbb, 0x80},
				payload:          []byte{0xab, 0xcd, 0xef},
			},
		},
	}

	for _, cur := range tt {
		parsed := &H265PACIPacket{}
		_, err := parsed.Unmarshal(cur.Raw)

		// Just for code coverage sake
		parsed.isH265Packet()

		if cur.ExpectedErr != nil && err == nil {
			t.Fatal("should error")
		} else if cur.ExpectedErr == nil && err != nil {
			t.Fatal("should not error")
		}

		if cur.ExpectedFU == nil {
			continue
		}

		if cur.ExpectedFU.PayloadHeader() != parsed.PayloadHeader() {
			t.Fatal("invalid PayloadHeader")
		}

		if cur.ExpectedFU.A() != parsed.A() {
			t.Fatal("invalid A")
		}

		if cur.ExpectedFU.CType() != parsed.CType() {
			t.Fatal("invalid CType")
		}

		if cur.ExpectedFU.PHSsize() != parsed.PHSsize() {
			t.Fatal("invalid PHSsize")
		}

		if cur.ExpectedFU.F0() != parsed.F0() {
			t.Fatal("invalid F0")
		}

		if cur.ExpectedFU.F1() != parsed.F1() {
			t.Fatal("invalid F1")
		}

		if cur.ExpectedFU.F2() != parsed.F2() {
			t.Fatal("invalid F2")
		}

		if cur.ExpectedFU.Y() != parsed.Y() {
			t.Fatal("invalid Y")
		}

		if !reflect.DeepEqual(cur.ExpectedFU.PHES(), parsed.PHES()) {
			t.Fatal("invalid PHES")
		}

		if !reflect.DeepEqual(cur.ExpectedFU.Payload(), parsed.Payload()) {
			t.Fatal("invalid Payload")
		}

		if cur.ExpectedFU.TSCI() != nil && (*cur.ExpectedFU.TSCI() != *parsed.TSCI()) {
			t.Fatal("invalid TSCI")
		}
	}
}

func TestH265_Packet(t *testing.T) {
	tt := [...]struct {
		Raw                []byte
		WithDONL           bool
		ExpectedPacketType reflect.Type
		ExpectedErr        error
	}{
		{
			Raw:         nil,
			ExpectedErr: errNilPacket,
		},
		{
			Raw:         []byte{},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x62, 0x01, 0x93},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x64, 0x01, 0x93, 0xaf},
			ExpectedErr: errShortPacket,
		},
		{
			Raw:         []byte{0x01, 0x01},
			WithDONL:    true,
			ExpectedErr: errShortPacket,
		},
		// FBit enabled in H265NALUHeader
		{
			Raw:         []byte{0x80, 0x01, 0x93, 0xaf, 0xaf, 0xaf, 0xaf},
			ExpectedErr: errH265CorruptedPacket,
		},
		// Valid H265SingleNALUnitPacket
		{
			Raw:                []byte{0x01, 0x01, 0xab, 0xcd, 0xef},
			ExpectedPacketType: reflect.TypeOf((*H265SingleNALUnitPacket)(nil)),
		},
		// Invalid H265SingleNALUnitPacket
		{
			Raw:         []byte{0x01, 0x01, 0x93, 0xaf},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
		// Valid H265PACIPacket
		{
			Raw:                []byte{0x64, 0x01, 0x64, 0b00111000, 0xaa, 0xbb, 0x80, 0xab, 0xcd, 0xef},
			ExpectedPacketType: reflect.TypeOf((*H265PACIPacket)(nil)),
		},
		// Valid H265FragmentationUnitPacket
		{
			Raw:                []byte{0x62, 0x01, 0x93, 0xcc, 0xdd, 0xaf, 0x0d, 0x5a},
			ExpectedPacketType: reflect.TypeOf((*H265FragmentationUnitPacket)(nil)),
			WithDONL:           true,
		},
		// Valid H265AggregationPacket
		{
			Raw:                []byte{0x60, 0x01, 0xcc, 0xdd, 0x00, 0x02, 0xff, 0xee, 0x77, 0x00, 0x01, 0xaa},
			ExpectedPacketType: reflect.TypeOf((*H265AggregationPacket)(nil)),
			WithDONL:           true,
		},
		// Invalid H265AggregationPacket
		{
			Raw:         []byte{0x60, 0x01, 0x00, 0x01, 0x00, 0x02, 0x00, 0x00},
			ExpectedErr: errShortPacket,
			WithDONL:    true,
		},
	}

	for _, cur := range tt {
		pck := &H265Packet{}
		if cur.WithDONL {
			pck.WithDONL(true)
		}

		_, err := pck.Unmarshal(cur.Raw)

		if cur.ExpectedErr != nil && err == nil {
			t.Fatal("should error")
		} else if cur.ExpectedErr == nil && err != nil {
			t.Fatal("should not error")
		}

		if cur.ExpectedErr != nil {
			continue
		}

		if reflect.TypeOf(pck.Packet()) != cur.ExpectedPacketType {
			t.Fatal("invalid packet type")
		}
	}
}

func TestH265IsPartitionHead(t *testing.T) {
	h265 := H265Packet{}

	if h265.IsPartitionHead(nil) {
		t.Fatal("nil must not be a partition head")
	}

	emptyNalu := []byte{}
	if h265.IsPartitionHead(emptyNalu) {
		t.Fatal("empty nalu must not be a partition head")
	}

	singleNalu := []byte{0x01, 0x01, 0xab, 0xcd, 0xef}
	if h265.IsPartitionHead(singleNalu) == false {
		t.Fatal("single nalu must be a partition head")
	}

	fbitNalu := []byte{0x80, 0x00, 0x00}
	if h265.IsPartitionHead(fbitNalu) == false {
		t.Fatal("fbit nalu must be a partition head")
	}

	fuStartNalu := []byte{0x62, 0x01, 0x93}
	if h265.IsPartitionHead(fuStartNalu) == false {
		t.Fatal("fu start nalu must be a partition head")
	}

	fuEndNalu := []byte{0x62, 0x01, 0x53}
	if h265.IsPartitionHead(fuEndNalu) {
		t.Fatal("fu end nalu must not be a partition head")
	}
}

func TestH265_Packet_Real(t *testing.T) {
	// Tests decoding of real H265 payloads extracted from a Wireshark dump.

	// nolint: lll
	tt := [...]string{
		"\x40\x01\x0c\x01\xff\xff\x01\x60\x00\x00\x03\x00\xb0\x00\x00\x03\x00\x00\x03\x00\x7b\xac\x09",
		"\x42\x01\x01\x01\x60\x00\x00\x03\x00\xb0\x00\x00\x03\x00\x00\x03\x00\x7b\xa0\x03\xc0\x80\x10\xe5\x8d\xae\x49\x32\xf4\xdc\x04\x04\x04\x02",
		"\x44\x01\xc0\xf2\xf0\x3c\x90",
		"\x4e\x01\xe5\x04\x61\x0c\x00\x00\x80",
		"\x62\x01\x93\xaf\x0d\x5a\xfe\x67\x77\x29\xc0\x74\xf3\x57\x4c\x16\x94\xaa\x7c\x2a\x64\x5f\xe9\xa5\xb7\x2a\xa3\x95\x9d\x94\xa7\xb4\xd3\xc4\x4a\xb1\xb7\x69\xca\xbe\x75\xc5\x64\xa8\x97\x4b\x8a\xbf\x7e\xf0\x0f\xc3\x22\x60\x67\xab\xae\x96\xd6\x99\xca\x7a\x8d\x35\x93\x1a\x67\x60\xe7\xbe\x7e\x13\x95\x3c\xe0\x11\xc1\xc1\xa7\x48\xef\xf7\x7b\xb0\xeb\x35\x49\x81\x4e\x4e\x54\xf7\x31\x6a\x38\xa1\xa7\x0c\xd6\xbe\x3b\x25\xba\x08\x19\x0b\x49\xfd\x90\xbb\x73\x7a\x45\x8c\xb9\x73\x43\x04\xc5\x5f\xda\x0f\xd5\x70\x4c\x11\xee\x72\xb8\x6a\xb4\x95\x62\x64\xb6\x23\x14\x7e\xdb\x0e\xa5\x0f\x86\x31\xe4\xd1\x64\x56\x43\xf6\xb7\xe7\x1b\x93\x4a\xeb\xd0\xa6\xe3\x1f\xce\xda\x15\x67\x05\xb6\x77\x36\x8b\x27\x5b\xc6\xf2\x95\xb8\x2b\xcc\x9b\x0a\x03\x05\xbe\xc3\xd3\x85\xf5\x69\xb6\x19\x1f\x63\x2d\x8b\x65\x9e\xc3\x9d\xd2\x44\xb3\x7c\x86\x3b\xea\xa8\x5d\x02\xe5\x40\x03\x20\x76\x48\xff\xf6\x2b\x0d\x18\xd6\x4d\x49\x70\x1a\x5e\xb2\x89\xca\xec\x71\x41\x79\x4e\x94\x17\x0c\x57\x51\x55\x14\x61\x40\x46\x4b\x3e\x17\xb2\xc8\xbd\x1c\x06\x13\x91\x72\xf8\xc8\xfc\x6f\xb0\x30\x9a\xec\x3b\xa6\xc9\x33\x0b\xa5\xe5\xf4\x65\x7a\x29\x8b\x76\x62\x81\x12\xaf\x20\x4c\xd9\x21\x23\x9e\xeb\xc9\x0e\x5b\x29\x35\x7f\x41\xcd\xce\xa1\xc4\xbe\x01\x30\xb9\x11\xc3\xb1\xe4\xce\x45\xd2\x5c\xb3\x1e\x69\x78\xba\xb1\x72\xe4\x88\x54\xd8\x5d\xd0\xa8\x3a\x74\xad\xe5\xc7\xc1\x59\x7c\x78\x15\x26\x37\x3d\x50\xae\xb3\xa4\x5b\x6c\x7d\x65\x66\x85\x4d\x16\x9a\x67\x74\xad\x55\x32\x3a\x84\x85\x0b\x6a\xeb\x24\x97\xb4\x20\x4d\xca\x41\x61\x7a\xd1\x7b\x60\xdb\x7f\xd5\x61\x22\xcf\xd1\x7e\x4c\xf3\x85\xfd\x13\x63\xe4\x9d\xed\xac\x13\x0a\xa0\x92\xb7\x34\xde\x65\x0f\xd9\x0f\x9b\xac\xe2\x47\xe8\x5c\xb3\x11\x8e\xc6\x08\x19\xd0\xb0\x85\x52\xc8\x5c\x1b\x08\x0a\xce\xc9\x6b\xa7\xef\x95\x2f\xd0\xb8\x63\xe5\x4c\xd4\xed\x6e\x87\xe9\xd4\x0a\xe6\x11\x44\x63\x00\x94\x18\xe9\x28\xba\xcf\x92\x43\x06\x59\xdd\x37\x4f\xd3\xef\x9d\x31\x5e\x9b\x48\xf9\x1f\x3e\x7b\x95\x3a\xbd\x1f\x71\x55\x0c\x06\xf9\x86\xf8\x3d\x39\x16\x50\xb3\x21\x11\x19\x6f\x70\xa9\x48\xe8\xbb\x0a\x11\x23\xf8\xab\xfe\x44\xe0\xbb\xe8\x64\xfa\x85\xe4\x02\x55\x88\x41\xc6\x30\x7f\x10\xad\x75\x02\x4b\xef\xe1\x0b\x06\x3c\x10\x49\x83\xf9\xd1\x3e\x3e\x67\x86\x4c\xf8\x9d\xde\x5a\xc4\xc8\xcf\xb6\xf4\xb0\xd3\x34\x58\xd4\x7b\x4d\xd3\x37\x63\xb2\x48\x8a\x7e\x20\x00\xde\xb4\x42\x8f\xda\xe9\x43\x9e\x0c\x16\xce\x79\xac\x2c\x70\xc1\x89\x05\x36\x62\x6e\xd9\xbc\xfb\x63\xc6\x79\x89\x3c\x90\x89\x2b\xd1\x8c\xe0\xc2\x54\xc7\xd6\xb4\xe8\x9e\x96\x55\x6e\x7b\xd5\x7f\xac\xd4\xa7\x1c\xa0\xdf\x01\x30\xad\xc0\x9f\x69\x06\x10\x43\x7f\xf4\x5d\x62\xa3\xea\x73\xf2\x14\x79\x19\x13\xea\x59\x14\x79\xa8\xe7\xce\xce\x44\x25\x13\x41\x18\x57\xdd\xce\xe4\xbe\xcc\x20\x80\x29\x71\x73\xa7\x7c\x86\x39\x76\xf4\xa7\x1c\x63\x24\x21\x93\x1e\xb5\x9a\x5c\x8a\x9e\xda\x8b\x9d\x88\x97\xfc\x98\x7d\x26\x74\x04\x1f\xa8\x10\x4f\x45\xcd\x46\xe8\x28\xe4\x8e\x59\x67\x63\x4a\xcf\x1e\xed\xdd\xbb\x79\x2f\x8d\x94\xab\xfc\xdb\xc5\x79\x1a\x4d\xcd\x53\x41\xdf\xd1\x7a\x8f\x46\x3e\x1f\x79\x88\xe3\xee\x9f\xc4\xc1\xe6\x2e\x89\x4d\x28\xc9\xca\x28\xc2\x0a\xc5\xc7\xf1\x22\xcd\xb3\x36\xfa\xe3\x7e\xa6\xcd\x95\x55\x5e\x0e\x1a\x75\x7f\x65\x27\xd3\x37\x4f\x23\xc5\xab\x49\x68\x4e\x02\xb5\xbf\xd7\x95\xc0\x78\x67\xbc\x1a\xe9\xae\x6f\x44\x58\x8a\xc2\xce\x42\x98\x4e\x77\xc7\x2a\xa0\xa7\x7d\xe4\x3b\xd1\x20\x82\x1a\xd3\xe2\xc7\x76\x5d\x06\x46\xb5\x24\xd7\xfb\x57\x63\x2b\x19\x51\x48\x65\x6d\xfb\xe0\x98\xd1\x14\x0e\x17\x64\x29\x34\x6f\x6e\x66\x9e\x8d\xc9\x89\x49\x69\xee\x74\xf3\x35\xe6\x8b\x67\x56\x95\x7f\x1b\xe9\xed\x8c\x0f\xe2\x19\x59\xbf\x03\x35\x55\x3c\x04\xbc\x40\x52\x90\x10\x08\xad\xa7\x65\xe0\x31\xcb\xcf\x3d\xd4\x62\x68\x01\x0d\xed\xf5\x28\x64\x2d\xaa\x7c\x99\x15\x8d\x70\x32\x53\xb8\x9d\x0a\x3c\xbf\x91\x02\x04\xd0\xee\x87\xce\x04\xcc\x3e\xa8\x20\xfd\x97\xdf\xbf\x4a\xbc\xfc\xc9\x7c\x77\x21\xcc\x23\x6f\x59\x38\xd8\xd9\xa0\x0e\xb1\x23\x4e\x04\x3f\x14\x9e\xcc\x05\x54\xab\x20\x69\xed\xa4\xd5\x1d\xb4\x1b\x52\xed\x6a\xea\xeb\x7f\xd1\xbc\xfd\x75\x20\xa0\x1c\x59\x8c\x5a\xa1\x2a\x70\x64\x11\xb1\x7b\xc1\x24\x80\x28\x51\x4c\x94\xa1\x95\x64\x72\xe8\x90\x67\x38\x74\x2b\xab\x38\x46\x12\x71\xce\x19\x98\x98\xf7\x89\xd4\xfe\x2f\x2a\xc5\x61\x20\xd0\xa4\x1a\x51\x3c\x82\xc8\x18\x31\x7a\x10\xe8\x1c\xc6\x95\x5a\xa0\x82\x88\xce\x8f\x4b\x47\x85\x7e\x89\x95\x95\x52\x1e\xac\xce\x45\x57\x61\x38\x97\x2b\x62\xa5\x14\x6f\xc3\xaa\x6c\x35\x83\xc9\xa3\x1e\x30\x89\xf4\xb1\xea\x4f\x39\xde\xde\xc7\x46\x5c\x0e\x85\x41\xec\x6a\xa4\xcb\xee\x70\x9c\x57\xd9\xf4\xa1\xc3\x9c\x2a\x0a\xf0\x5d\x58\xb0\xae\xd4\xdc\xc5\x6a\xa8\x34\xfa\x23\xef\xef\x08\x39\xc3\x3d\xea\x11\x6e\x6a\xe0\x1e\xd0\x52\xa8\xc3\x6e\xc9\x1c\xfc\xd0\x0c\x4c\xea\x0d\x82\xcb\xdd\x29\x1a\xc4\x4f\x6e\xa3\x4d\xcb\x7a\x38\x77\xe5\x15\x6e\xad\xfa\x9d\x2f\x02\xb6\x39\x84\x3a\x60\x8f\x71\x9f\x92\xe5\x24\x4f\xbd\x18\x49\xd5\xef\xbf\x70\xfb\xd1\x4c\x2e\xfc\x2f\x36\xf3\x00\x31\x2e\x90\x18\xcc\xf4\x71\xb9\xe4\xf9\xbe\xcb\x5e\xff\xf3\xe7\xf8\xca\x03\x60\x66\xb3\xc9\x5a\xf9\x74\x09\x02\x57\xb6\x90\x94\xfc\x41\x35\xdc\x35\x3f\x32\x7a\xa6\xa5\xcd\x8a\x8f\xc8\x3d\xc8\x81\xc3\xec\x37\x74\x86\x61\x41\x0d\xc5\xe2\xc8\x0c\x84\x2b\x3b\x71\x58\xde\x1b\xe3\x20\x65\x2e\x76\xf4\x98\xd8\xaa\x78\xe6\xeb\xb8\x85\x0d\xa0\xd0\xf5\x57\x64\x01\x58\x55\x82\xd5\x0f\x2d\x9c\x3e\x2a\xa0\x7e\xaf\x42\xf3\x37\xd1\xb3\xaf\xda\x5b\xa9\xda\xe3\x89\x5d\xf1\xca\xa5\x12\x3d\xe7\x91\x95\x53\x21\x72\xca\x7f\xf6\x79\x59\x21\xcf\x30\x18\xfb\x78\x55\x40\x59\xc3\xf9\xf1\xdd\x58\x44\x5e\x83\x11\x5c\x2d\x1d\x91\xf6\x01\x3d\x3f\xd4\x33\x81\x66\x6c\x40\x7a\x9d\x70\x10\x58\xe6\x53\xad\x85\x11\x99\x3e\x4b\xbc\x31\xc6\x78\x9d\x79\xc5\xde\x9f\x2e\x43\xfa\x76\x84\x2f\xfd\x28\x75\x12\x48\x25\xfd\x15\x8c\x29\x6a\x91\xa4\x63\xc0\xa2\x8c\x41\x3c\xf1\xb0\xf8\xdf\x66\xeb\xbd\x14\x88\xa9\x81\xa7\x35\xc4\x41\x40\x6c\x10\x3f\x09\xbd\xb5\xd3\x7a\xee\x4b\xd5\x86\xff\x36\x03\x6b\x78\xde",
		"\x62\x01\x53\x8a\xe9\x25\xe1\x06\x09\x8e\xba\x12\x74\x87\x09\x9a\x95\xe4\x86\x62\x2b\x4b\xf9\xa6\x2e\x7b\x35\x43\xf7\x39\x99\x0f\x3b\x6f\xfd\x1a\x6e\x23\x54\x70\xb5\x1d\x10\x1c\x63\x40\x96\x99\x41\xb6\x96\x0b\x70\x98\xec\x17\xb0\xaa\xdc\x4a\xab\xe8\x3b\xb7\x6b\x00\x1c\x5b\xc3\xe0\xa2\x8b\x7c\x17\xc8\x92\xc9\xb0\x92\xb6\x70\x84\x95\x30",
		"\x4e\x01\xe5\x04\x35\xac\x00\x00\x80",
		"\x62\x01\x41\xb0\x75\x5c\x27\x46\xef\x8a\xe7\x1d\x50\x38\xb2\x13\x33\xe0\x79\x35\x1b\xc2\xb5\x79\x73\xe7\xc2\x6f\xb9\x1a\x8c\x21\x0e\xa9\x54\x17\x6c\x41\xab\xc8\x16\x57\xec\x5e\xeb\x89\x3b\xa9\x90\x8c\xff\x4d\x46\x8b\xf0\xd9\xc0\xd0\x51\xcf\x8b\x88\xf1\x5f\x1e\x9e\xc1\xb9\x1f\xe3\x06\x45\x35\x8a\x47\xe8\x9a\xf2\x4f\x19\x4c\xf8\xce\x68\x1b\x63\x34\x11\x75\xea\xe5\xb1\x0f\x38\xcc\x05\x09\x8b\x3e\x2b\x88\x84\x9d\xc5\x03\xc3\xc0\x90\x32\xe2\x45\x69\xb1\xe5\xf7\x68\x6b\x16\x90\xa0\x40\xe6\x18\x74\xd8\x68\xf3\x34\x38\x99\xf2\x6c\xb7\x1a\x35\x21\xca\x52\x56\x4c\x7f\xb2\xa3\xd5\xb8\x40\x50\x48\x3e\xdc\xdf\x0b\xf5\x54\x5a\x15\x1a\xe2\xc3\xb4\x94\xda\x3f\xb5\x34\xa2\xca\xbc\x2f\xe0\xa4\xe5\x69\xf4\xbf\x62\x4d\x15\x21\x1b\x11\xfc\x39\xaa\x86\x74\x96\x63\xfd\x07\x53\x26\xf6\x34\x72\xeb\x14\x37\x98\x0d\xf4\x68\x91\x2c\x6b\x46\x83\x88\x82\x04\x8b\x9f\xb8\x32\x73\x75\x8b\xf9\xac\x71\x42\xd1\x2d\xb4\x28\x28\xf5\x78\xe0\x32\xf3\xe1\xfc\x43\x6b\xf9\x92\xf7\x48\xfe\x7f\xc0\x17\xbd\xfd\xba\x2f\x58\x6f\xee\x84\x03\x18\xce\xb0\x9d\x8d\xeb\x22\xf1\xfc\xb1\xcf\xff\x2f\xb2\x9f\x6c\xe5\xb4\x69\xdc\xdd\x20\x93\x00\x30\xad\x56\x04\x66\x7e\xa3\x3c\x18\x4b\x43\x66\x00\x27\x1e\x1c\x09\x11\xd8\xf4\x8a\x9e\xc5\x6a\x94\xe5\xae\x0b\x8a\xbe\x84\xda\xe5\x44\x7f\x38\x1c\xe7\xbb\x03\x19\x66\xe1\x5d\x1d\xc1\xbd\x3d\xc6\xb7\xe3\xff\x7f\x8e\xff\x1e\xf6\x9e\x6f\x58\x27\x74\x65\xef\x02\x5d\xa4\xde\x27\x7f\x51\xe3\x4b\x9e\x3f\x79\x83\xbd\x1b\x8f\x0d\x77\xfb\xbc\xc5\x9f\x15\xa7\x4e\x05\x8a\x24\x97\x66\xb2\x7c\xf6\xe1\x84\x54\xdb\x39\x5e\xf6\x1b\x8f\x05\x73\x1d\xb6\x8e\xd7\x09\x9a\xc5\x92\x80",
	}

	for _, cur := range tt {
		pck := &H265Packet{}
		_, err := pck.Unmarshal([]byte(cur))
		if err != nil {
			t.Fatal("invalid packet type")
		}
	}
}

func TestH265Payloader_Payload(t *testing.T) {
	tt := []struct {
		Name            string
		Data            []byte
		MTU             uint16
		AddDONL         bool
		SkipAggregation bool
		ExpectedLen     int
		ExpectedData    *[][]byte
		Msg             string
	}{
		{
			Name:        "Positive MTU, nil payload",
			MTU:         1,
			Data:        nil,
			ExpectedLen: 0,
			Msg:         "Generated payload must be empty",
		},
		{
			Name:        "Positive MTU, empty NAL",
			MTU:         1,
			Data:        []byte{},
			ExpectedLen: 0,
			Msg:         "Generated payload should be empty",
		},
		{
			Name:        "Zero MTU, start code",
			MTU:         0,
			Data:        []byte{0x00, 0x00, 0x01},
			ExpectedLen: 0,
			Msg:         "Generated payload should be empty",
		},
		{
			Name:        "Positive MTU, 1 byte payload",
			MTU:         1,
			Data:        []byte{0x90},
			ExpectedLen: 0,
			Msg:         "Generated payload should be empty. H.265 nal unit too small",
		},
		{
			Name:        "MTU:1, 2 byte payload",
			MTU:         1,
			Data:        []byte{0x46, 0x01},
			ExpectedLen: 0,
			Msg:         "Generated payload should be empty. H.265 nal unit too small",
		},
		{
			Name:        "MTU:2, 2 byte payload.",
			MTU:         2,
			Data:        []byte{0x46, 0x01},
			ExpectedLen: 0,
			Msg:         "Generated payload should be empty. min MTU is 4",
		},
		{
			Name:         "MTU:4, 2 byte payload.",
			MTU:          4,
			Data:         []byte{0x46, 0x01},
			ExpectedData: &[][]byte{{0x46, 0x01}},
			Msg:          "AUD packetization failed",
		},
		{
			Name:        "Negative MTU, small payload",
			MTU:         0,
			Data:        []byte{0x90, 0x90, 0x90},
			ExpectedLen: 0,
		},
		{
			Name:        "Negative MTU, small payload",
			MTU:         0,
			Data:        []byte{0x90, 0x90, 0x90},
			ExpectedLen: 0,
		},
		{
			Name:        "Negative MTU, small payload",
			MTU:         1,
			Data:        []byte{0x90, 0x90, 0x90},
			ExpectedLen: 0,
		},
		{
			Name:         "Negative MTU, small payload",
			MTU:          5,
			Data:         []byte{0x90, 0x90, 0x90},
			ExpectedData: &[][]byte{{0x90, 0x90, 0x90}},
		},
		{
			Name: "Large payload",
			MTU:  5,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00,
				0x01, 0x02, 0x03, 0x04,
				0x05, 0x06, 0x07, 0x08,
				0x09, 0x10, 0x11, 0x12,
				0x13, 0x14, 0x15,
			},
			ExpectedData: &[][]byte{
				{0x62, 0x01, 0x80, 0x02, 0x03},
				{0x62, 0x01, 0x00, 0x04, 0x05},
				{0x62, 0x01, 0x00, 0x06, 0x07},
				{0x62, 0x01, 0x00, 0x08, 0x09},
				{0x62, 0x01, 0x00, 0x10, 0x11},
				{0x62, 0x01, 0x00, 0x12, 0x13},
				{0x62, 0x01, 0x40, 0x14, 0x15},
			},
			Msg: "Large payload split across fragmentation Packets",
		},
		{
			Name: "Short MTU, multiple NALUs flushed in single packet",
			MTU:  5,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
			},
			ExpectedData: &[][]byte{{0x00, 0x01}, {0x02, 0x03}},
			Msg:          "multiple Single NALUs packetization should succeed",
		},
		{
			Name: "Enough MUT, multiple NALUs create Signle Packet",
			MTU:  10,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
			},
			ExpectedData: &[][]byte{{0x60, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0x02, 0x03}},
			Msg:          "Aggregation packetization should succeed",
		},
		{
			Name: "Enough MUT, multiple NALUs flushed two Packets, don't aggregate",
			MTU:  5,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
				0x00, 0x00, 0x01, 0x04, 0x05,
			},
			ExpectedData: &[][]byte{{0x00, 0x01}, {0x02, 0x03}, {0x04, 0x05}},
			Msg:          "multiple Single NALUs packetization should succeed",
		},
		{
			Name: "Enough MUT, multiple NALUs flushed two Packets, aggregate",
			MTU:  15,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
				0x00, 0x00, 0x01, 0x04, 0x05,
			},
			ExpectedData: &[][]byte{{0x60, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0x02, 0x03, 0x00, 0x02, 0x04, 0x05}},
			Msg:          "Aggregation packetization should succeed",
		},
		// Add DONL = true
		{
			Name:        "DONL, invalid MTU:1",
			MTU:         1,
			Data:        []byte{0x01},
			AddDONL:     true,
			ExpectedLen: 0,
			Msg:         "Generated payload must be empty",
		},
		{
			Name:        "DONL MTU:4, 2 byte payload.",
			MTU:         4,
			Data:        []byte{0x00, 0x01},
			AddDONL:     true,
			ExpectedLen: 0,
			Msg:         "Generated payload must be empty",
		},
		{
			Name:         "DONL single NALU minimum payload",
			MTU:          6,
			Data:         []byte{0x00, 0x01},
			AddDONL:      true,
			ExpectedData: &[][]byte{{0x00, 0x01, 0x00, 0x00}},
			Msg:          "single NALU should be packetized",
		},
		{
			Name: "DONL multiple NALU",
			MTU:  6,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
				0x00, 0x00, 0x01, 0x04, 0x05,
			},
			AddDONL: true,
			ExpectedData: &[][]byte{
				{0x00, 0x01, 0x00, 0x00},
				{0x02, 0x03, 0x00, 0x01},
				{0x04, 0x05, 0x00, 0x02},
			},
			Msg: "DONL should be incremented",
		},
		{
			Name: "DONL aggregation minimum payload",
			MTU:  18,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
				0x00, 0x00, 0x01, 0x04, 0x05,
			},
			AddDONL: true,
			ExpectedData: &[][]byte{
				{
					0x60, 0x01, // NALU Header + Layer ID + TID
					0x00, 0x00, // DONL
					0x00, 0x02, 0x00, 0x01,
					0x00, // DONL
					0x00, 0x02, 0x02, 0x03,
					0x01, // DONL
					0x00, 0x02, 0x04, 0x05,
				},
			},
			Msg: "DONL Aggregation packetization should succeed",
		},
		{
			Name: "DONL Large payload",
			MTU:  7,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00,
				0x01, 0x02, 0x03, 0x04,
				0x05, 0x06, 0x07, 0x08,
				0x09, 0x10, 0x11, 0x12,
				0x13, 0x14, 0x15,
			},
			AddDONL: true,
			ExpectedData: &[][]byte{
				{0x62, 0x01, 0x80, 0x00, 0x00, 0x02, 0x03},
				{0x62, 0x01, 0x00, 0x00, 0x01, 0x04, 0x05},
				{0x62, 0x01, 0x00, 0x00, 0x02, 0x06, 0x07},
				{0x62, 0x01, 0x00, 0x00, 0x03, 0x08, 0x09},
				{0x62, 0x01, 0x00, 0x00, 0x04, 0x10, 0x11},
				{0x62, 0x01, 0x00, 0x00, 0x05, 0x12, 0x13},
				{0x62, 0x01, 0x40, 0x00, 0x06, 0x14, 0x15},
			},
			Msg: "DONL Large payload split across fragmentation Packets",
		},
		// SkipAggregation = true
		{
			Name: "SkipAggregation Enough MUT, multiple NALUs",
			MTU:  4,
			Data: []byte{
				0x00, 0x00, 0x01, 0x00, 0x01,
				0x00, 0x00, 0x01, 0x02, 0x03,
				0x00, 0x00, 0x01, 0x04, 0x05,
			},
			SkipAggregation: true,
			ExpectedData:    &[][]byte{{0x00, 0x01}, {0x02, 0x03}, {0x04, 0x05}},
			Msg:             "Aggregation packetization should be skipped",
		},
	}

	for _, cur := range tt {
		t.Run(cur.Name, func(t *testing.T) {
			pck := H265Payloader{AddDONL: cur.AddDONL, SkipAggregation: cur.SkipAggregation}
			res := pck.Payload(cur.MTU, cur.Data)
			if cur.ExpectedData != nil {
				if !reflect.DeepEqual(res, *cur.ExpectedData) {
					t.Fatal(cur.Msg)
				}
			} else {
				if len(res) != cur.ExpectedLen {
					t.Fatal(cur.Msg)
				}
			}
		})
	}
}

func TestH265Payloader_Real(t *testing.T) {
	// curl -LO "https://test-videos.co.uk/vids/bigbuckbunny/mp4/h265/1080/Big_Buck_Bunny_1080_10s_1MB.mp4"
	// ffmpeg -i Big_Buck_Bunny_1080_10s_1MB.mp4 -c:v copy Big_Buck_Bunny_1080_10s_1MB.h265
	// hexdump -v -e '1/1 "0x%02x, "' Big_Buck_Bunny_1080_10s_1MB.h265 > aaa

	// nolint: lll
	payload := []byte{
		0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x01, 0x60, 0x00, 0x00, 0x03, 0x00, 0x90, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00, 0x78, 0x95, 0x98, 0x09,
		0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01, 0x01, 0x60, 0x00, 0x00, 0x03, 0x00, 0x90, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00, 0x78, 0xa0, 0x03, 0xc0, 0x80, 0x10, 0xe5, 0x96, 0x56, 0x69, 0x24, 0xca, 0xf0, 0x10, 0x10, 0x00, 0x00, 0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x01, 0xe0, 0x80,
		0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72, 0xb4, 0x62, 0x40,
		0x00, 0x00, 0x00, 0x01, 0x4e, 0x01, 0x05, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x71, 0x2c, 0xa2, 0xde, 0x09, 0xb5, 0x17, 0x47, 0xdb, 0xbb, 0x55, 0xa4, 0xfe, 0x7f, 0xc2, 0xfc, 0x4e, 0x78, 0x32, 0x36, 0x35, 0x20, 0x28, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x20, 0x31, 0x35, 0x31, 0x29, 0x20, 0x2d, 0x20, 0x32, 0x2e, 0x36, 0x2b, 0x34, 0x39, 0x2d, 0x37, 0x32, 0x31, 0x39, 0x33, 0x37, 0x36, 0x64, 0x65, 0x34, 0x32, 0x61, 0x3a, 0x5b, 0x57, 0x69, 0x6e, 0x64, 0x6f, 0x77, 0x73, 0x5d, 0x5b, 0x47, 0x43, 0x43, 0x20, 0x37, 0x2e, 0x33, 0x2e, 0x30, 0x5d, 0x5b, 0x36, 0x34, 0x20, 0x62, 0x69, 0x74, 0x5d, 0x20, 0x38, 0x62, 0x69, 0x74, 0x2b, 0x31, 0x30, 0x62, 0x69, 0x74, 0x20, 0x2d, 0x20, 0x48, 0x2e, 0x32, 0x36, 0x35, 0x2f, 0x48, 0x45, 0x56, 0x43, 0x20, 0x63, 0x6f, 0x64, 0x65, 0x63, 0x20, 0x2d, 0x20, 0x43, 0x6f, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74, 0x20, 0x32, 0x30, 0x31, 0x33, 0x2d, 0x32, 0x30, 0x31, 0x38, 0x20, 0x28, 0x63, 0x29, 0x20, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x63, 0x6f, 0x72, 0x65, 0x77, 0x61, 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	}
	pck := H265Payloader{}
	res := pck.Payload(1400, payload)
	if len(res) != 3 {
		// 1. Aggregating three NALUs into a single payload
		// 2. Fragmented packets divided by MTU=1400
		// 3. Remaining fragment packets split by MTU
		t.Fatal("Generated payload should be 3")
	}
}

func uint8ptr(v uint8) *uint8 {
	return &v
}

func uint16ptr(v uint16) *uint16 {
	return &v
}