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// +build !js
package webrtc
import (
"io"
"sync/atomic"
"time"
"github.com/pion/rtp"
"github.com/pion/srtp/v2"
)
// srtpWriterFuture blocks Read/Write calls until
// the SRTP Session is available
type srtpWriterFuture struct {
rtpSender *RTPSender
rtcpReadStream atomic.Value // *srtp.ReadStreamSRTCP
rtpWriteStream atomic.Value // *srtp.WriteStreamSRTP
}
func (s *srtpWriterFuture) init(returnWhenNoSRTP bool) error {
if returnWhenNoSRTP {
select {
case <-s.rtpSender.stopCalled:
return io.ErrClosedPipe
case <-s.rtpSender.transport.srtpReady:
default:
return nil
}
} else {
select {
case <-s.rtpSender.stopCalled:
return io.ErrClosedPipe
case <-s.rtpSender.transport.srtpReady:
}
}
srtcpSession, err := s.rtpSender.transport.getSRTCPSession()
if err != nil {
return err
}
rtcpReadStream, err := srtcpSession.OpenReadStream(uint32(s.rtpSender.ssrc))
if err != nil {
return err
}
srtpSession, err := s.rtpSender.transport.getSRTPSession()
if err != nil {
return err
}
rtpWriteStream, err := srtpSession.OpenWriteStream()
if err != nil {
return err
}
s.rtcpReadStream.Store(rtcpReadStream)
s.rtpWriteStream.Store(rtpWriteStream)
return nil
}
func (s *srtpWriterFuture) Close() error {
if value := s.rtcpReadStream.Load(); value != nil {
return value.(*srtp.ReadStreamSRTCP).Close()
}
return nil
}
func (s *srtpWriterFuture) Read(b []byte) (n int, err error) {
if value := s.rtcpReadStream.Load(); value != nil {
return value.(*srtp.ReadStreamSRTCP).Read(b)
}
if err := s.init(false); err != nil || s.rtcpReadStream.Load() == nil {
return 0, err
}
return s.Read(b)
}
func (s *srtpWriterFuture) SetReadDeadline(t time.Time) error {
if value := s.rtcpReadStream.Load(); value != nil {
return value.(*srtp.ReadStreamSRTCP).SetReadDeadline(t)
}
if err := s.init(false); err != nil || s.rtcpReadStream.Load() == nil {
return err
}
return s.SetReadDeadline(t)
}
func (s *srtpWriterFuture) WriteRTP(header *rtp.Header, payload []byte) (int, error) {
if value := s.rtpWriteStream.Load(); value != nil {
return value.(*srtp.WriteStreamSRTP).WriteRTP(header, payload)
}
if err := s.init(true); err != nil || s.rtpWriteStream.Load() == nil {
return 0, err
}
return s.WriteRTP(header, payload)
}
func (s *srtpWriterFuture) Write(b []byte) (int, error) {
if value := s.rtpWriteStream.Load(); value != nil {
return value.(*srtp.WriteStreamSRTP).Write(b)
}
if err := s.init(true); err != nil || s.rtpWriteStream.Load() == nil {
return 0, err
}
return s.Write(b)
}
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