From f45fef29d841e052e5625792b49581ec67b59f3e Mon Sep 17 00:00:00 2001
From: Alex X <alexey.khit@gmail.com>
Date: Tue, 8 Apr 2025 19:55:51 +0300
Subject: [PATCH] Add support eseecloud source #1690

---
 internal/eseecloud/eseecloud.go |  10 ++
 main.go                         |   2 +
 pkg/eseecloud/eseecloud.go      | 180 ++++++++++++++++++++++++++++++++
 3 files changed, 192 insertions(+)
 create mode 100644 internal/eseecloud/eseecloud.go
 create mode 100644 pkg/eseecloud/eseecloud.go

diff --git a/internal/eseecloud/eseecloud.go b/internal/eseecloud/eseecloud.go
new file mode 100644
index 00000000..bb4d9d31
--- /dev/null
+++ b/internal/eseecloud/eseecloud.go
@@ -0,0 +1,10 @@
+package eseecloud
+
+import (
+	"github.com/AlexxIT/go2rtc/internal/streams"
+	"github.com/AlexxIT/go2rtc/pkg/eseecloud"
+)
+
+func Init() {
+	streams.HandleFunc("eseecloud", eseecloud.Dial)
+}
diff --git a/main.go b/main.go
index f3589ebf..0f36cafb 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ import (
 	"github.com/AlexxIT/go2rtc/internal/doorbird"
 	"github.com/AlexxIT/go2rtc/internal/dvrip"
 	"github.com/AlexxIT/go2rtc/internal/echo"
+	"github.com/AlexxIT/go2rtc/internal/eseecloud"
 	"github.com/AlexxIT/go2rtc/internal/exec"
 	"github.com/AlexxIT/go2rtc/internal/expr"
 	"github.com/AlexxIT/go2rtc/internal/ffmpeg"
@@ -90,6 +91,7 @@ func main() {
 	doorbird.Init() // doorbird source
 	v4l2.Init()     // v4l2 source
 	flussonic.Init()
+	eseecloud.Init()
 
 	// 6. Helper modules
 
diff --git a/pkg/eseecloud/eseecloud.go b/pkg/eseecloud/eseecloud.go
new file mode 100644
index 00000000..05209d22
--- /dev/null
+++ b/pkg/eseecloud/eseecloud.go
@@ -0,0 +1,180 @@
+package eseecloud
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net/http"
+	"regexp"
+	"strings"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/h264/annexb"
+	"github.com/pion/rtp"
+)
+
+type Producer struct {
+	core.Connection
+	rd *core.ReadBuffer
+
+	videoPT, audioPT uint8
+}
+
+func Dial(rawURL string) (core.Producer, error) {
+	rawURL, _ = strings.CutPrefix(rawURL, "eseecloud")
+	res, err := http.Get("http" + rawURL)
+	if err != nil {
+		return nil, err
+	}
+
+	prod, err := Open(res.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if info, ok := prod.(core.Info); ok {
+		info.SetProtocol("http")
+		info.SetURL(rawURL)
+	}
+
+	return prod, nil
+}
+
+func Open(r io.Reader) (core.Producer, error) {
+	prod := &Producer{
+		Connection: core.Connection{
+			ID:         core.NewID(),
+			FormatName: "eseecloud",
+			Transport:  r,
+		},
+		rd: core.NewReadBuffer(r),
+	}
+
+	if err := prod.probe(); err != nil {
+		return nil, err
+	}
+
+	return prod, nil
+}
+
+func (p *Producer) probe() error {
+	b, err := p.rd.Peek(1024)
+	if err != nil {
+		return err
+	}
+
+	i := bytes.Index(b, []byte("\r\n\r\n"))
+	if i == -1 {
+		return io.EOF
+	}
+
+	b = make([]byte, i+4)
+	_, _ = p.rd.Read(b)
+
+	re := regexp.MustCompile(`m=(video|audio) (\d+) (\w+)/(\d+)\S*`)
+	for _, item := range re.FindAllStringSubmatch(string(b), 2) {
+		p.SDP += item[0] + "\n"
+
+		switch item[3] {
+		case "H264", "H265":
+			p.Medias = append(p.Medias, &core.Media{
+				Kind:      core.KindVideo,
+				Direction: core.DirectionRecvonly,
+				Codecs: []*core.Codec{
+					{
+						Name:        item[3],
+						ClockRate:   90000,
+						PayloadType: core.PayloadTypeRAW,
+					},
+				},
+			})
+			p.videoPT = byte(core.Atoi(item[2]))
+
+		case "G711":
+			p.Medias = append(p.Medias, &core.Media{
+				Kind:      core.KindAudio,
+				Direction: core.DirectionRecvonly,
+				Codecs: []*core.Codec{
+					{
+						Name:      core.CodecPCMA,
+						ClockRate: 8000,
+					},
+				},
+			})
+			p.audioPT = byte(core.Atoi(item[2]))
+		}
+	}
+
+	return nil
+}
+
+func (p *Producer) Start() error {
+	receivers := make(map[uint8]*core.Receiver)
+
+	for _, receiver := range p.Receivers {
+		switch receiver.Codec.Kind() {
+		case core.KindVideo:
+			receivers[p.videoPT] = receiver
+		case core.KindAudio:
+			receivers[p.audioPT] = receiver
+		}
+	}
+
+	for {
+		pkt, err := p.readPacket()
+		if err != nil {
+			return err
+		}
+
+		if recv := receivers[pkt.PayloadType]; recv != nil {
+			switch recv.Codec.Name {
+			case core.CodecH264, core.CodecH265:
+				// timestamp = seconds x 1000000
+				pkt = &rtp.Packet{
+					Header: rtp.Header{
+						Timestamp: uint32(uint64(pkt.Timestamp) * 90000 / 1000000),
+					},
+					Payload: annexb.EncodeToAVCC(pkt.Payload),
+				}
+			case core.CodecPCMA:
+				pkt = &rtp.Packet{
+					Header: rtp.Header{
+						Version:        2,
+						SequenceNumber: pkt.SequenceNumber,
+						Timestamp:      uint32(uint64(pkt.Timestamp) * 8000 / 1000000),
+					},
+					Payload: pkt.Payload,
+				}
+			}
+			recv.WriteRTP(pkt)
+		}
+	}
+}
+
+func (p *Producer) readPacket() (*core.Packet, error) {
+	b := make([]byte, 8)
+
+	if _, err := io.ReadFull(p.rd, b); err != nil {
+		return nil, err
+	}
+
+	if b[0] != '$' {
+		return nil, errors.New("eseecloud: wrong start byte")
+	}
+
+	size := binary.BigEndian.Uint32(b[4:])
+	b = make([]byte, size)
+	if _, err := io.ReadFull(p.rd, b); err != nil {
+		return nil, err
+	}
+
+	pkt := &core.Packet{}
+	if err := pkt.Unmarshal(b); err != nil {
+		return nil, err
+	}
+
+	p.Recv += int(size)
+
+	return pkt, nil
+}