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/*
* Copyright 2018 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.
*/
#import <Foundation/Foundation.h>
#import "RTCMacros.h"
#import "RTCRtpReceiver.h"
#import "RTCRtpSender.h"
NS_ASSUME_NONNULL_BEGIN
extern NSString *const kRTCRtpTransceiverErrorDomain;
/** https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiverdirection */
typedef NS_ENUM(NSInteger, RTCRtpTransceiverDirection) {
RTCRtpTransceiverDirectionSendRecv,
RTCRtpTransceiverDirectionSendOnly,
RTCRtpTransceiverDirectionRecvOnly,
RTCRtpTransceiverDirectionInactive,
RTCRtpTransceiverDirectionStopped
};
/** Structure for initializing an RTCRtpTransceiver in a call to
* RTCPeerConnection.addTransceiver.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiverinit
*/
RTC_OBJC_EXPORT
@interface RTC_OBJC_TYPE (RTCRtpTransceiverInit) : NSObject
/** Direction of the RTCRtpTransceiver. See RTCRtpTransceiver.direction. */
@property(nonatomic) RTCRtpTransceiverDirection direction;
/** The added RTCRtpTransceiver will be added to these streams. */
@property(nonatomic) NSArray<NSString *> *streamIds;
/** TODO(bugs.webrtc.org/7600): Not implemented. */
@property(nonatomic) NSArray<RTC_OBJC_TYPE(RTCRtpEncodingParameters) *> *sendEncodings;
@end
@class RTC_OBJC_TYPE(RTCRtpTransceiver);
/** The RTCRtpTransceiver maps to the RTCRtpTransceiver defined by the
* WebRTC specification. A transceiver represents a combination of an RTCRtpSender
* and an RTCRtpReceiver that share a common mid. As defined in JSEP, an
* RTCRtpTransceiver is said to be associated with a media description if its
* mid property is non-nil; otherwise, it is said to be disassociated.
* JSEP: https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-24
*
* Note that RTCRtpTransceivers are only supported when using
* RTCPeerConnection with Unified Plan SDP.
*
* WebRTC specification for RTCRtpTransceiver, the JavaScript analog:
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver
*/
RTC_OBJC_EXPORT
@protocol RTC_OBJC_TYPE
(RTCRtpTransceiver)<NSObject>
/** Media type of the transceiver. The sender and receiver will also have this
* type.
*/
@property(nonatomic, readonly) RTCRtpMediaType mediaType;
/** The mid attribute is the mid negotiated and present in the local and
* remote descriptions. Before negotiation is complete, the mid value may be
* nil. After rollbacks, the value may change from a non-nil value to nil.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-mid
*/
@property(nonatomic, readonly) NSString *mid;
/** The sender attribute exposes the RTCRtpSender 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
*/
@property(nonatomic, readonly) RTC_OBJC_TYPE(RTCRtpSender) * sender;
/** The receiver attribute exposes the RTCRtpReceiver 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
*/
@property(nonatomic, readonly) RTC_OBJC_TYPE(RTCRtpReceiver) * receiver;
/** The isStopped 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 RTCRtpTransceiver to be stopped.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-stopped
*/
@property(nonatomic, readonly) BOOL isStopped;
/** 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
*/
@property(nonatomic, readonly) RTCRtpTransceiverDirection direction;
/** The currentDirection 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 not
* present and this method returns NO.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-currentdirection
*/
- (BOOL)currentDirection:(RTCRtpTransceiverDirection *)currentDirectionOut;
/** The stop method irreversibly stops the RTCRtpTransceiver. The sender of
* this transceiver will no longer send, the receiver will no longer receive.
* https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-stop
*/
- (void)stopInternal;
/** 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
*/
- (void)setDirection:(RTCRtpTransceiverDirection)direction error:(NSError **)error;
@end
RTC_OBJC_EXPORT
@interface RTC_OBJC_TYPE (RTCRtpTransceiver) : NSObject <RTC_OBJC_TYPE(RTCRtpTransceiver)>
- (instancetype)init NS_UNAVAILABLE;
@end
NS_ASSUME_NONNULL_END
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