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