install go2rtc on bob

2026-04-04 19:36:14 +02:00
parent f0b56e63d1
commit ccf88187b8
537 changed files with 69213 additions and 0 deletions
@@ -0,0 +1,20 @@
+## AAC-LD and AAC-ELD
+
+| Codec   | Rate  | QuickTime | ffmpeg | VLC |
+|---------|-------|-----------|--------|-----|
+| AAC-LD  | 8000  | yes       | no     | no  |
+| AAC-LD  | 16000 | yes       | no     | no  |
+| AAC-LD  | 22050 | yes       | yes    | no  |
+| AAC-LD  | 24000 | yes       | yes    | no  |
+| AAC-LD  | 32000 | yes       | yes    | no  |
+| AAC-ELD | 8000  | yes       | no     | no  |
+| AAC-ELD | 16000 | yes       | no     | no  |
+| AAC-ELD | 22050 | yes       | yes    | yes |
+| AAC-ELD | 24000 | yes       | yes    | yes |
+| AAC-ELD | 32000 | yes       | yes    | yes |
+
+## Useful links
+
+- [4.6.20 Enhanced Low Delay Codec](https://csclub.uwaterloo.ca/~ehashman/ISO14496-3-2009.pdf)
+- https://stackoverflow.com/questions/40014508/aac-adts-for-aacobject-eld-packets
+- https://code.videolan.org/videolan/vlc/-/blob/master/modules/packetizer/mpeg4audio.c
@@ -0,0 +1,126 @@
+package aac
+
+import (
+	"encoding/hex"
+	"fmt"
+
+	"github.com/AlexxIT/go2rtc/pkg/bits"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+)
+
+const (
+	TypeAACMain = 1
+	TypeAACLC   = 2  // Low Complexity
+	TypeAACLD   = 23 // Low Delay (48000, 44100, 32000, 24000, 22050)
+	TypeESCAPE  = 31
+	TypeAACELD  = 39 // Enhanced Low Delay
+
+	AUTime = 1024
+
+	// FMTP streamtype=5 - audio stream
+	FMTP = "streamtype=5;profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config="
+)
+
+var sampleRates = [16]uint32{
+	96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350,
+	0, 0, 0, // protection from request sampleRates[15]
+}
+
+func ConfigToCodec(conf []byte) *core.Codec {
+	// https://en.wikipedia.org/wiki/MPEG-4_Part_3#MPEG-4_Audio_Object_Types
+	rd := bits.NewReader(conf)
+
+	codec := &core.Codec{
+		FmtpLine:    FMTP + hex.EncodeToString(conf),
+		PayloadType: core.PayloadTypeRAW,
+	}
+
+	objType := rd.ReadBits(5)
+	if objType == TypeESCAPE {
+		objType = 32 + rd.ReadBits(6)
+	}
+
+	switch objType {
+	case TypeAACLC, TypeAACLD, TypeAACELD:
+		codec.Name = core.CodecAAC
+	default:
+		codec.Name = fmt.Sprintf("AAC-%X", objType)
+	}
+
+	if sampleRateIdx := rd.ReadBits8(4); sampleRateIdx < 0x0F {
+		codec.ClockRate = sampleRates[sampleRateIdx]
+	} else {
+		codec.ClockRate = rd.ReadBits(24)
+	}
+
+	codec.Channels = rd.ReadBits8(4)
+
+	return codec
+}
+
+func DecodeConfig(b []byte) (objType, sampleFreqIdx, channels byte, sampleRate uint32) {
+	rd := bits.NewReader(b)
+
+	objType = rd.ReadBits8(5)
+	if objType == 0b11111 {
+		objType = 32 + rd.ReadBits8(6)
+	}
+
+	sampleFreqIdx = rd.ReadBits8(4)
+	if sampleFreqIdx == 0b1111 {
+		sampleRate = rd.ReadBits(24)
+	} else {
+		sampleRate = sampleRates[sampleFreqIdx]
+	}
+
+	channels = rd.ReadBits8(4)
+	return
+}
+
+func EncodeConfig(objType byte, sampleRate uint32, channels byte, shortFrame bool) []byte {
+	wr := bits.NewWriter(nil)
+
+	if objType < TypeESCAPE {
+		wr.WriteBits8(objType, 5)
+	} else {
+		wr.WriteBits8(TypeESCAPE, 5)
+		wr.WriteBits8(objType-32, 6)
+	}
+
+	i := indexUint32(sampleRates[:], sampleRate)
+	if i >= 0 {
+		wr.WriteBits8(byte(i), 4)
+	} else {
+		wr.WriteBits8(0xF, 4)
+		wr.WriteBits(sampleRate, 24)
+	}
+
+	wr.WriteBits8(channels, 4)
+
+	switch objType {
+	case TypeAACLD:
+		// https://github.com/FFmpeg/FFmpeg/blob/67d392b97941bb51fb7af3a3c9387f5ab895fa46/libavcodec/aacdec_template.c#L841
+		wr.WriteBool(shortFrame)
+		wr.WriteBit(0)      // dependsOnCoreCoder
+		wr.WriteBit(0)      // extension_flag
+		wr.WriteBits8(0, 2) // ep_config
+	case TypeAACELD:
+		// https://github.com/FFmpeg/FFmpeg/blob/67d392b97941bb51fb7af3a3c9387f5ab895fa46/libavcodec/aacdec_template.c#L922
+		wr.WriteBool(shortFrame)
+		wr.WriteBits8(0, 3) // res_flags
+		wr.WriteBit(0)      // ldSbrPresentFlag
+		wr.WriteBits8(0, 4) // ELDEXT_TERM
+		wr.WriteBits8(0, 2) // ep_config
+	}
+
+	return wr.Bytes()
+}
+
+func indexUint32(s []uint32, v uint32) int {
+	for i := range s {
+		if v == s[i] {
+			return i
+		}
+	}
+	return -1
+}
@@ -0,0 +1,52 @@
+package aac
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConfigToCodec(t *testing.T) {
+	s := "profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=F8EC3000"
+	s = core.Between(s, "config=", ";")
+	src, err := hex.DecodeString(s)
+	require.Nil(t, err)
+
+	codec := ConfigToCodec(src)
+	require.Equal(t, core.CodecAAC, codec.Name)
+	require.Equal(t, uint32(24000), codec.ClockRate)
+	require.Equal(t, uint16(1), codec.Channels)
+
+	dst := EncodeConfig(TypeAACELD, 24000, 1, true)
+	require.Equal(t, src, dst)
+}
+
+func TestADTS(t *testing.T) {
+	// FFmpeg MPEG-TS AAC (one packet)
+	s := "fff15080021ffc210049900219002380fff15080021ffc212049900219002380" //...
+	src, err := hex.DecodeString(s)
+	require.Nil(t, err)
+
+	codec := ADTSToCodec(src)
+	require.Equal(t, uint32(44100), codec.ClockRate)
+	require.Equal(t, uint16(2), codec.Channels)
+
+	size := ReadADTSSize(src)
+	require.Equal(t, uint16(16), size)
+
+	dst := CodecToADTS(codec)
+	WriteADTSSize(dst, size)
+
+	require.Equal(t, src[:len(dst)], dst)
+}
+
+func TestEncodeConfig(t *testing.T) {
+	conf := EncodeConfig(TypeAACLC, 48000, 1, false)
+	require.Equal(t, "1188", hex.EncodeToString(conf))
+	conf = EncodeConfig(TypeAACLC, 16000, 1, false)
+	require.Equal(t, "1408", hex.EncodeToString(conf))
+	conf = EncodeConfig(TypeAACLC, 8000, 1, false)
+	require.Equal(t, "1588", hex.EncodeToString(conf))
+}
@@ -0,0 +1,148 @@
+package aac
+
+import (
+	"encoding/hex"
+
+	"github.com/AlexxIT/go2rtc/pkg/bits"
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+const ADTSHeaderSize = 7
+
+func ADTSHeaderLen(b []byte) int {
+	if HasCRC(b) {
+		return 9 // 7 bytes header + 2 bytes CRC
+	}
+	return ADTSHeaderSize
+}
+
+func IsADTS(b []byte) bool {
+	// AAAAAAAA AAAABCCD EEFFFFGH HHIJKLMM MMMMMMMM MMMOOOOO OOOOOOPP (QQQQQQQQ QQQQQQQQ)
+	// A	12	Syncword, all bits must be set to 1.
+	// C	2	Layer, always set to 0.
+	return len(b) >= ADTSHeaderSize && b[0] == 0xFF && b[1]&0b1111_0110 == 0xF0
+}
+
+func HasCRC(b []byte) bool {
+	// AAAAAAAA AAAABCCD EEFFFFGH HHIJKLMM MMMMMMMM MMMOOOOO OOOOOOPP (QQQQQQQQ QQQQQQQQ)
+	// D	1	Protection absence, set to 1 if there is no CRC and 0 if there is CRC.
+	return b[1]&0b1 == 0
+}
+
+func ADTSToCodec(b []byte) *core.Codec {
+	// 1. Check ADTS header
+	if !IsADTS(b) {
+		return nil
+	}
+
+	// 2. Decode ADTS params
+	// https://wiki.multimedia.cx/index.php/ADTS
+	rd := bits.NewReader(b)
+	_ = rd.ReadBits(12)              // Syncword, all bits must be set to 1
+	_ = rd.ReadBit()                 // MPEG Version, set to 0 for MPEG-4 and 1 for MPEG-2
+	_ = rd.ReadBits(2)               // Layer, always set to 0
+	_ = rd.ReadBit()                 // Protection absence, set to 1 if there is no CRC and 0 if there is CRC
+	objType := rd.ReadBits8(2) + 1   // Profile, the MPEG-4 Audio Object Type minus 1
+	sampleRateIdx := rd.ReadBits8(4) // MPEG-4 Sampling Frequency Index
+	_ = rd.ReadBit()                 // Private bit, guaranteed never to be used by MPEG, set to 0 when encoding, ignore when decoding
+	channels := rd.ReadBits8(3)      // MPEG-4 Channel Configuration
+
+	//_ = rd.ReadBit()    // Originality, set to 1 to signal originality of the audio and 0 otherwise
+	//_ = rd.ReadBit()    // Home, set to 1 to signal home usage of the audio and 0 otherwise
+	//_ = rd.ReadBit()    // Copyright ID bit
+	//_ = rd.ReadBit()    // Copyright ID start
+	//_ = rd.ReadBits(13) // Frame length
+	//_ = rd.ReadBits(11) // Buffer fullness
+	//_ = rd.ReadBits(2)  // Number of AAC frames (Raw Data Blocks) in ADTS frame minus 1
+	//_ = rd.ReadBits(16) // CRC check
+
+	// 3. Encode RTP config
+	wr := bits.NewWriter(nil)
+	wr.WriteBits8(objType, 5)
+	wr.WriteBits8(sampleRateIdx, 4)
+	wr.WriteBits8(channels, 4)
+	conf := wr.Bytes()
+
+	codec := &core.Codec{
+		Name:      core.CodecAAC,
+		ClockRate: sampleRates[sampleRateIdx],
+		Channels:  channels,
+		FmtpLine:  FMTP + hex.EncodeToString(conf),
+	}
+	return codec
+}
+
+func ReadADTSSize(b []byte) uint16 {
+	// AAAAAAAA AAAABCCD EEFFFFGH HHIJKLMM MMMMMMMM MMMOOOOO OOOOOOPP (QQQQQQQQ QQQQQQQQ)
+	_ = b[5] // bounds
+	return uint16(b[3]&0b11)<<11 | uint16(b[4])<<3 | uint16(b[5]>>5)
+}
+
+func WriteADTSSize(b []byte, size uint16) {
+	// AAAAAAAA AAAABCCD EEFFFFGH HHIJKLMM MMMMMMMM MMMOOOOO OOOOOOPP (QQQQQQQQ QQQQQQQQ)
+	_ = b[5] // bounds
+	b[3] |= byte(size >> (8 + 3))
+	b[4] = byte(size >> 3)
+	b[5] |= byte(size << 5)
+	return
+}
+
+func ADTSTimeSize(b []byte) uint32 {
+	var units uint32
+	for len(b) > ADTSHeaderSize {
+		auSize := ReadADTSSize(b)
+		b = b[auSize:]
+		units++
+	}
+	return units * AUTime
+}
+
+func CodecToADTS(codec *core.Codec) []byte {
+	s := core.Between(codec.FmtpLine, "config=", ";")
+	conf, err := hex.DecodeString(s)
+	if err != nil {
+		return nil
+	}
+
+	objType, sampleFreqIdx, channels, _ := DecodeConfig(conf)
+	profile := objType - 1
+
+	wr := bits.NewWriter(nil)
+	wr.WriteAllBits(1, 12)          // Syncword, all bits must be set to 1
+	wr.WriteBit(0)                  // MPEG Version, set to 0 for MPEG-4 and 1 for MPEG-2
+	wr.WriteBits8(0, 2)             // Layer, always set to 0
+	wr.WriteBit(1)                  // Protection absence, set to 1 if there is no CRC and 0 if there is CRC
+	wr.WriteBits8(profile, 2)       // Profile, the MPEG-4 Audio Object Type minus 1
+	wr.WriteBits8(sampleFreqIdx, 4) // MPEG-4 Sampling Frequency Index
+	wr.WriteBit(0)                  // Private bit, guaranteed never to be used by MPEG, set to 0 when encoding, ignore when decoding
+	wr.WriteBits8(channels, 3)      // MPEG-4 Channel Configuration
+	wr.WriteBit(0)                  // Originality, set to 1 to signal originality of the audio and 0 otherwise
+	wr.WriteBit(0)                  // Home, set to 1 to signal home usage of the audio and 0 otherwise
+	wr.WriteBit(0)                  // Copyright ID bit
+	wr.WriteBit(0)                  // Copyright ID start
+	wr.WriteBits16(0, 13)           // Frame length
+	wr.WriteAllBits(1, 11)          // Buffer fullness (variable bitrate)
+	wr.WriteBits8(0, 2)             // Number of AAC frames (Raw Data Blocks) in ADTS frame minus 1
+
+	return wr.Bytes()
+}
+
+func EncodeToADTS(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc {
+	adts := CodecToADTS(codec)
+
+	return func(packet *rtp.Packet) {
+		if !IsADTS(packet.Payload) {
+			b := make([]byte, ADTSHeaderSize+len(packet.Payload))
+			copy(b, adts)
+			copy(b[ADTSHeaderSize:], packet.Payload)
+			WriteADTSSize(b, uint16(len(b)))
+
+			clone := *packet
+			clone.Payload = b
+			handler(&clone)
+		} else {
+			handler(packet)
+		}
+	}
+}
@@ -0,0 +1,59 @@
+package aac
+
+import (
+	"io"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+type Consumer struct {
+	core.Connection
+	wr *core.WriteBuffer
+}
+
+func NewConsumer() *Consumer {
+	medias := []*core.Media{
+		{
+			Kind:      core.KindAudio,
+			Direction: core.DirectionSendonly,
+			Codecs: []*core.Codec{
+				{Name: core.CodecAAC},
+			},
+		},
+	}
+	wr := core.NewWriteBuffer(nil)
+	return &Consumer{
+		Connection: core.Connection{
+			ID:         core.NewID(),
+			FormatName: "adts",
+			Medias:     medias,
+			Transport:  wr,
+		},
+		wr: wr,
+	}
+}
+
+func (c *Consumer) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error {
+	sender := core.NewSender(media, track.Codec)
+
+	sender.Handler = func(pkt *rtp.Packet) {
+		if n, err := c.wr.Write(pkt.Payload); err == nil {
+			c.Send += n
+		}
+	}
+
+	if track.Codec.IsRTP() {
+		sender.Handler = RTPToADTS(track.Codec, sender.Handler)
+	} else {
+		sender.Handler = EncodeToADTS(track.Codec, sender.Handler)
+	}
+
+	sender.HandleRTP(track)
+	c.Senders = append(c.Senders, sender)
+	return nil
+}
+
+func (c *Consumer) WriteTo(wr io.Writer) (int64, error) {
+	return c.wr.WriteTo(wr)
+}
@@ -0,0 +1,85 @@
+package aac
+
+import (
+	"bufio"
+	"errors"
+	"io"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+type Producer struct {
+	core.Connection
+	rd *bufio.Reader
+}
+
+func Open(r io.Reader) (*Producer, error) {
+	rd := bufio.NewReader(r)
+
+	b, err := rd.Peek(ADTSHeaderSize)
+	if err != nil {
+		return nil, err
+	}
+
+	codec := ADTSToCodec(b)
+	if codec == nil {
+		return nil, errors.New("adts: wrong header")
+	}
+	codec.PayloadType = core.PayloadTypeRAW
+
+	medias := []*core.Media{
+		{
+			Kind:      core.KindAudio,
+			Direction: core.DirectionRecvonly,
+			Codecs:    []*core.Codec{codec},
+		},
+	}
+	return &Producer{
+		Connection: core.Connection{
+			ID:         core.NewID(),
+			FormatName: "adts",
+			Medias:     medias,
+			Transport:  r,
+		},
+		rd: rd,
+	}, nil
+}
+
+func (c *Producer) Start() error {
+	for {
+		// read ADTS header
+		adts := make([]byte, ADTSHeaderSize)
+		if _, err := io.ReadFull(c.rd, adts); err != nil {
+			return err
+		}
+
+		auSize := ReadADTSSize(adts) - ADTSHeaderSize
+
+		if HasCRC(adts) {
+			// skip CRC after header
+			if _, err := c.rd.Discard(2); err != nil {
+				return err
+			}
+			auSize -= 2
+		}
+
+		// read AAC payload after header
+		payload := make([]byte, auSize)
+		if _, err := io.ReadFull(c.rd, payload); err != nil {
+			return err
+		}
+
+		c.Recv += int(auSize)
+
+		if len(c.Receivers) == 0 {
+			continue
+		}
+
+		pkt := &rtp.Packet{
+			Header:  rtp.Header{Timestamp: core.Now90000()},
+			Payload: payload,
+		}
+		c.Receivers[0].WriteRTP(pkt)
+	}
+}
@@ -0,0 +1,154 @@
+package aac
+
+import (
+	"encoding/binary"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+const RTPPacketVersionAAC = 0
+
+func RTPDepay(handler core.HandlerFunc) core.HandlerFunc {
+	var timestamp uint32
+
+	return func(packet *rtp.Packet) {
+		// support ONLY 2 bytes header size!
+		// streamtype=5;profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=1408
+		// https://datatracker.ietf.org/doc/html/rfc3640
+		headersSize := binary.BigEndian.Uint16(packet.Payload) >> 3
+
+		//log.Printf("[RTP/AAC] units: %d, size: %4d, ts: %10d, %t", headersSize/2, len(packet.Payload), packet.Timestamp, packet.Marker)
+
+		if len(packet.Payload) < int(2+headersSize) {
+			// In very rare cases noname cameras may send data not according to the standard
+			// https://github.com/AlexxIT/go2rtc/issues/1328
+			if IsADTS(packet.Payload) {
+				clone := *packet
+				clone.Version = RTPPacketVersionAAC
+				clone.Timestamp = timestamp
+				clone.Payload = clone.Payload[ADTSHeaderSize:]
+				handler(&clone)
+			}
+			return
+		}
+
+		headers := packet.Payload[2 : 2+headersSize]
+		units := packet.Payload[2+headersSize:]
+
+		for len(headers) >= 2 {
+			unitSize := binary.BigEndian.Uint16(headers) >> 3
+
+			if len(units) < int(unitSize) {
+				return
+			}
+
+			unit := units[:unitSize]
+
+			headers = headers[2:]
+			units = units[unitSize:]
+
+			timestamp += AUTime
+
+			clone := *packet
+			clone.Version = RTPPacketVersionAAC
+			clone.Timestamp = timestamp
+			if IsADTS(unit) {
+				clone.Payload = unit[ADTSHeaderSize:]
+			} else {
+				clone.Payload = unit
+			}
+			handler(&clone)
+		}
+	}
+}
+
+func RTPPay(handler core.HandlerFunc) core.HandlerFunc {
+	var seq uint16
+	var ts uint32
+
+	return func(packet *rtp.Packet) {
+		if packet.Version != RTPPacketVersionAAC {
+			handler(packet)
+			return
+		}
+
+		// support ONLY one unit in payload
+		auSize := uint16(len(packet.Payload))
+		// 2 bytes header size + 2 bytes first payload size
+		payload := make([]byte, 2+2+auSize)
+		payload[1] = 16 // header size in bits
+		binary.BigEndian.PutUint16(payload[2:], auSize<<3)
+		copy(payload[4:], packet.Payload)
+
+		clone := rtp.Packet{
+			Header: rtp.Header{
+				Version:        2,
+				Marker:         true,
+				SequenceNumber: seq,
+				Timestamp:      ts,
+			},
+			Payload: payload,
+		}
+		handler(&clone)
+
+		seq++
+		ts += AUTime
+	}
+}
+
+func ADTStoRTP(src []byte) (dst []byte) {
+	dst = make([]byte, 2) // header bytes
+	for i, n := 0, len(src)-ADTSHeaderSize; i < n; {
+		auSize := ReadADTSSize(src[i:])
+		dst = append(dst, byte(auSize>>5), byte(auSize<<3)) // size in bits
+		i += int(auSize)
+	}
+	hdrSize := uint16(len(dst) - 2)
+	binary.BigEndian.PutUint16(dst, hdrSize<<3) // size in bits
+	return append(dst, src...)
+}
+
+func RTPTimeSize(b []byte) uint32 {
+	// convert RTP header size to units count
+	units := binary.BigEndian.Uint16(b) >> 4
+	return uint32(units) * AUTime
+}
+
+func RTPToADTS(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc {
+	adts := CodecToADTS(codec)
+
+	return func(packet *rtp.Packet) {
+		src := packet.Payload
+		dst := make([]byte, 0, len(src))
+
+		headersSize := binary.BigEndian.Uint16(src) >> 3
+		headers := src[2 : 2+headersSize]
+		units := src[2+headersSize:]
+
+		for len(headers) > 0 {
+			unitSize := binary.BigEndian.Uint16(headers) >> 3
+			headers = headers[2:]
+			unit := units[:unitSize]
+			units = units[unitSize:]
+
+			if !IsADTS(unit) {
+				i := len(dst)
+				dst = append(dst, adts...)
+				WriteADTSSize(dst[i:], ADTSHeaderSize+uint16(len(unit)))
+			}
+
+			dst = append(dst, unit...)
+		}
+
+		clone := *packet
+		clone.Version = RTPPacketVersionAAC
+		clone.Payload = dst
+		handler(&clone)
+	}
+}
+
+func RTPToCodec(b []byte) *core.Codec {
+	hdrSize := binary.BigEndian.Uint16(b) / 8
+	return ADTSToCodec(b[2+hdrSize:])
+}
@@ -0,0 +1,33 @@
+package aac
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBuggy_RTSP_AAC(t *testing.T) {
+	// https: //github.com/AlexxIT/go2rtc/issues/1328
+	payload, _ := hex.DecodeString("fff16080431ffc211ad4458aa309a1c0a8761a230502b7c74b2b5499252a010555e32e460128303c8ace4fd3260d654a424f7e7c65eddc96735fc6f1ac0edf94fdefa0e0bd6370da1c07b9c0e77a9d6e86b196a1ac7439dcafadcffcf6d89f60ac67f8884868e931383ad3e40cf5495470d1f606ef6f7624d285b951ebfa0e42641ab98f1371182b237d14f1bd16ad714fa2f1c6a7d23ebde7a0e34a2eca156a608a4caec49d9dca4b6fe2a09e9cdbf762c5b4148a3914abb7959c991228b0837b5988334b9fc18b8fac689b5ca1e4661573bbb8b253a86cae7ec14ace49969a9a76fd571ab6e650764cb59114d61dcedf07ac61b39e4ac66adebfd0d0ab45d518dd3c161049823f150864d977cf0855172ac8482e4b25fe911325d19617558c5405af74aff5492e4599bee53f2dbdf0503730af37078550f84c956b7ee89aae83c154fa2fa6e6792c5ddd5cd5cf6bb96bf055fee7f93bed59ffb039daee5ea7e5593cb194e9091e417c67d8f73026a6a6ae056e808f7c65c03d1b9197d3709ceb63bc7b979f7ba71df5e7c6395d99d6ea229000a6bc16fb4346d6b27d32f5d8d1200736d9366d59c0c9547210813b602473da9c46f9015bbb37594c1dd90cd6a36e96bd5d6a1445ab93c9e65505ec2c722bb4cc27a10600139a48c83594dde145253c386f6627d8c6e5102fe3828a590c709bc87f55b37e97d1ae72b017b09c6bb2c13299817bb45cc67318e10b6822075b97c6a03ec1c0")
+	packet := &rtp.Packet{
+		Header: rtp.Header{
+			Version:        2,
+			Marker:         true,
+			SequenceNumber: 36944,
+			Timestamp:      4217191328,
+			SSRC:           12892774,
+		},
+		Payload: payload,
+	}
+
+	var size int
+
+	RTPDepay(func(packet *core.Packet) {
+		size = len(packet.Payload)
+	})(packet)
+
+	require.Equal(t, len(payload), size+ADTSHeaderSize)
+}