Add priority to RTCRtpEncodingParameters.

Expose two parameters in the Obj-C wrapper.

Bug: webrtc:10438
Change-Id: I3be424720c927d95b0df908ab7cca1bb0613ada8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135122
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27845}

sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h

@@ -51,6 +51,12 @@ RTC_OBJC_EXPORT
 /** The SSRC being used by this encoding. */
 @property(nonatomic, readonly, nullable) NSNumber *ssrc;
 
+/** The relative bitrate priority. */
+@property(nonatomic, assign) double bitratePriority;
+
+/** The relative DiffServ Code Point priority. */
+@property(nonatomic, assign) double networkPriority;
+
 - (instancetype)init NS_DESIGNATED_INITIALIZER;
 
 @end

sdk/objc/api/peerconnection/RTCRtpEncodingParameters.mm

@@ -22,6 +22,8 @@
 @synthesize numTemporalLayers = _numTemporalLayers;
 @synthesize scaleResolutionDownBy = _scaleResolutionDownBy;
 @synthesize ssrc = _ssrc;
+@synthesize bitratePriority = _bitratePriority;
+@synthesize networkPriority = _networkPriority;
 
 - (instancetype)init {
   return [super init];
@@ -55,6 +57,8 @@
     if (nativeParameters.ssrc) {
       _ssrc = [NSNumber numberWithUnsignedLong:*nativeParameters.ssrc];
     }
+    _bitratePriority = nativeParameters.bitrate_priority;
+    _networkPriority = nativeParameters.network_priority;
   }
   return self;
 }
@@ -84,6 +88,8 @@
   if (_ssrc != nil) {
     parameters.ssrc = absl::optional<uint32_t>(_ssrc.unsignedLongValue);
   }
+  parameters.bitrate_priority = _bitratePriority;
+  parameters.network_priority = _networkPriority;
   return parameters;
 }