SetStreams API of RtpSender wrapped for iOS and Android

Bug: webrtc:10129
Change-Id: I36ea0110de655bbffa2bd18a024abd15a2136838
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/155983
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29405}

sdk/objc/api/peerconnection/RTCRtpSender.h

@@ -35,6 +35,9 @@ RTC_OBJC_EXPORT
  */
 @property(nonatomic, copy, nullable) RTCMediaStreamTrack *track;
 
+/** IDs of streams associated with the RTP sender */
+@property(nonatomic, copy) NSArray<NSString *> *streamIds;
+
 /** The RTCDtmfSender accociated with the RTP sender. */
 @property(nonatomic, readonly, nullable) id<RTCDtmfSender> dtmfSender;
 

sdk/objc/api/peerconnection/RTCRtpSender.mm

@@ -57,6 +57,23 @@
   }
 }
 
+- (NSArray<NSString *> *)streamIds {
+  std::vector<std::string> nativeStreamIds = _nativeRtpSender->stream_ids();
+  NSMutableArray *streamIds = [NSMutableArray arrayWithCapacity:nativeStreamIds.size()];
+  for (const auto &s : nativeStreamIds) {
+    [streamIds addObject:[NSString stringForStdString:s]];
+  }
+  return streamIds;
+}
+
+- (void)setStreamIds:(NSArray<NSString *> *)streamIds {
+  std::vector<std::string> nativeStreamIds;
+  for (NSString *streamId in streamIds) {
+    nativeStreamIds.push_back([streamId UTF8String]);
+  }
+  _nativeRtpSender->SetStreams(nativeStreamIds);
+}
+
 - (NSString *)description {
   return [NSString stringWithFormat:@"RTCRtpSender {\n  senderId: %@\n}",
       self.senderId];