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/*
* Copyright 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_RTPTRANSCEIVERINTERFACE_H_
#define API_RTPTRANSCEIVERINTERFACE_H_
#include <string>
#include <vector>
#include "api/optional.h"
#include "api/rtpreceiverinterface.h"
#include "api/rtpsenderinterface.h"
#include "rtc_base/refcount.h"
namespace webrtc {
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiverdirection
enum class RtpTransceiverDirection {
kSendRecv,
kSendOnly,
kRecvOnly,
kInactive
};
// Structure for initializing an RtpTransceiver in a call to
// PeerConnectionInterface::AddTransceiver.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiverinit
struct RtpTransceiverInit final {
// Direction of the RtpTransceiver. See RtpTransceiverInterface::direction().
RtpTransceiverDirection direction = RtpTransceiverDirection::kSendRecv;
// The added RtpTransceiver will be added to these streams.
// TODO(bugs.webrtc.org/7600): Not implemented.
std::vector<rtc::scoped_refptr<MediaStreamInterface>> streams;
// TODO(bugs.webrtc.org/7600): Not implemented.
std::vector<RtpEncodingParameters> send_encodings;
};
// The RtpTransceiverInterface maps to the RTCRtpTransceiver defined by the
// WebRTC specification. A transceiver represents a combination of an RtpSender
// and an RtpReceiver than share a common mid. As defined in JSEP, an
// RtpTransceiver is said to be associated with a media description if its mid
// property is non-null; otherwise, it is said to be disassociated.
// JSEP: https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-24
//
// Note that RtpTransceivers are only supported when using PeerConnection with
// Unified Plan SDP.
//
// This class is thread-safe.
//
// WebRTC specification for RTCRtpTransceiver, the JavaScript analog:
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver
class RtpTransceiverInterface : public rtc::RefCountInterface {
public:
// The mid attribute is the mid negotiated and present in the local and
// remote descriptions. Before negotiation is complete, the mid value may be
// null. After rollbacks, the value may change from a non-null value to null.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-mid
virtual rtc::Optional<std::string> mid() const = 0;
// The sender attribute exposes the RtpSender corresponding to the RTP media
// that may be sent with the transceiver's mid. The sender is always present,
// regardless of the direction of media.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-sender
virtual rtc::scoped_refptr<RtpSenderInterface> sender() const = 0;
// The receiver attribute exposes the RtpReceiver corresponding to the RTP
// media that may be received with the transceiver's mid. The receiver is
// always present, regardless of the direction of media.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-receiver
virtual rtc::scoped_refptr<RtpReceiverInterface> receiver() const = 0;
// The stopped attribute indicates that the sender of this transceiver will no
// longer send, and that the receiver will no longer receive. It is true if
// either stop has been called or if setting the local or remote description
// has caused the RtpTransceiver to be stopped.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-stopped
virtual bool stopped() const = 0;
// The direction attribute indicates the preferred direction of this
// transceiver, which will be used in calls to CreateOffer and CreateAnswer.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-direction
virtual RtpTransceiverDirection direction() const = 0;
// Sets the preferred direction of this transceiver. An update of
// directionality does not take effect immediately. Instead, future calls to
// CreateOffer and CreateAnswer mark the corresponding media descriptions as
// sendrecv, sendonly, recvonly, or inactive.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-direction
virtual void SetDirection(RtpTransceiverDirection new_direction) = 0;
// The current_direction attribute indicates the current direction negotiated
// for this transceiver. If this transceiver has never been represented in an
// offer/answer exchange, or if the transceiver is stopped, the value is null.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-currentdirection
virtual rtc::Optional<RtpTransceiverDirection> current_direction() const = 0;
// The Stop method irreversibly stops the RtpTransceiver. The sender of this
// transceiver will no longer send, the receiver will no longer receive.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-stop
virtual void Stop() = 0;
// The SetCodecPreferences method overrides the default codec preferences used
// by WebRTC for this transceiver.
// https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-setcodecpreferences
// TODO(steveanton): Not implemented.
virtual void SetCodecPreferences(
rtc::ArrayView<RtpCodecCapability> codecs) = 0;
protected:
virtual ~RtpTransceiverInterface() = default;
};
} // namespace webrtc
#endif // API_RTPTRANSCEIVERINTERFACE_H_
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