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server/vendor/github.com/pion/srtp/v2/stream_srtcp.go

@@ -0,0 +1,160 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package srtp
+
+import (
+	"errors"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/pion/rtcp"
+	"github.com/pion/transport/v2/packetio"
+)
+
+// Limit the buffer size to 100KB
+const srtcpBufferSize = 100 * 1000
+
+// ReadStreamSRTCP handles decryption for a single RTCP SSRC
+type ReadStreamSRTCP struct {
+	mu sync.Mutex
+
+	isClosed chan bool
+
+	session  *SessionSRTCP
+	ssrc     uint32
+	isInited bool
+
+	buffer io.ReadWriteCloser
+}
+
+func (r *ReadStreamSRTCP) write(buf []byte) (n int, err error) {
+	n, err = r.buffer.Write(buf)
+
+	if errors.Is(err, packetio.ErrFull) {
+		// Silently drop data when the buffer is full.
+		return len(buf), nil
+	}
+
+	return n, err
+}
+
+// Used by getOrCreateReadStream
+func newReadStreamSRTCP() readStream {
+	return &ReadStreamSRTCP{}
+}
+
+// ReadRTCP reads and decrypts full RTCP packet and its header from the nextConn
+func (r *ReadStreamSRTCP) ReadRTCP(buf []byte) (int, *rtcp.Header, error) {
+	n, err := r.Read(buf)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	header := &rtcp.Header{}
+	err = header.Unmarshal(buf[:n])
+	if err != nil {
+		return 0, nil, err
+	}
+
+	return n, header, nil
+}
+
+// Read reads and decrypts full RTCP packet from the nextConn
+func (r *ReadStreamSRTCP) Read(buf []byte) (int, error) {
+	return r.buffer.Read(buf)
+}
+
+// SetReadDeadline sets the deadline for the Read operation.
+// Setting to zero means no deadline.
+func (r *ReadStreamSRTCP) SetReadDeadline(t time.Time) error {
+	if b, ok := r.buffer.(interface {
+		SetReadDeadline(time.Time) error
+	}); ok {
+		return b.SetReadDeadline(t)
+	}
+	return nil
+}
+
+// Close removes the ReadStream from the session and cleans up any associated state
+func (r *ReadStreamSRTCP) Close() error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	if !r.isInited {
+		return errStreamNotInited
+	}
+
+	select {
+	case <-r.isClosed:
+		return errStreamAlreadyClosed
+	default:
+		err := r.buffer.Close()
+		if err != nil {
+			return err
+		}
+
+		r.session.removeReadStream(r.ssrc)
+		return nil
+	}
+}
+
+func (r *ReadStreamSRTCP) init(child streamSession, ssrc uint32) error {
+	sessionSRTCP, ok := child.(*SessionSRTCP)
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if !ok {
+		return errFailedTypeAssertion
+	} else if r.isInited {
+		return errStreamAlreadyInited
+	}
+
+	r.session = sessionSRTCP
+	r.ssrc = ssrc
+	r.isInited = true
+	r.isClosed = make(chan bool)
+
+	if r.session.bufferFactory != nil {
+		r.buffer = r.session.bufferFactory(packetio.RTCPBufferPacket, ssrc)
+	} else {
+		// Create a buffer and limit it to 100KB
+		buff := packetio.NewBuffer()
+		buff.SetLimitSize(srtcpBufferSize)
+		r.buffer = buff
+	}
+
+	return nil
+}
+
+// GetSSRC returns the SSRC we are demuxing for
+func (r *ReadStreamSRTCP) GetSSRC() uint32 {
+	return r.ssrc
+}
+
+// WriteStreamSRTCP is stream for a single Session that is used to encrypt RTCP
+type WriteStreamSRTCP struct {
+	session *SessionSRTCP
+}
+
+// WriteRTCP encrypts a RTCP header and its payload to the nextConn
+func (w *WriteStreamSRTCP) WriteRTCP(header *rtcp.Header, payload []byte) (int, error) {
+	headerRaw, err := header.Marshal()
+	if err != nil {
+		return 0, err
+	}
+
+	return w.session.write(append(headerRaw, payload...))
+}
+
+// Write encrypts and writes a full RTCP packets to the nextConn
+func (w *WriteStreamSRTCP) Write(b []byte) (int, error) {
+	return w.session.write(b)
+}
+
+// SetWriteDeadline sets the deadline for the Write operation.
+// Setting to zero means no deadline.
+func (w *WriteStreamSRTCP) SetWriteDeadline(t time.Time) error {
+	return w.session.setWriteDeadline(t)
+}