Adding Java and Obj-C bindings for RtpEncodingParameters.ssrc.

BUG=webrtc:6903

Review-Url: https://codereview.webrtc.org/2581913002
Cr-Commit-Position: refs/heads/master@{#15936}

webrtc/sdk/android/api/org/webrtc/RtpParameters.java

@@ -21,6 +21,7 @@ public class RtpParameters {
     public boolean active = true;
     // A null value means "no maximum bitrate".
     public Integer maxBitrateBps;
+    public Long ssrc;
   }
 
   public static class Codec {

webrtc/sdk/android/src/jni/peerconnection_jni.cc

@@ -2335,8 +2335,12 @@ static void JavaRtpParametersToJsepRtpParameters(
       GetFieldID(jni, j_encoding_parameters_class, "active", "Z");
   jfieldID bitrate_id = GetFieldID(jni, j_encoding_parameters_class,
                                    "maxBitrateBps", "Ljava/lang/Integer;");
+  jfieldID ssrc_id =
+      GetFieldID(jni, j_encoding_parameters_class, "ssrc", "Ljava/lang/Long;");
   jclass j_integer_class = jni->FindClass("java/lang/Integer");
+  jclass j_long_class = jni->FindClass("java/lang/Long");
   jmethodID int_value_id = GetMethodID(jni, j_integer_class, "intValue", "()I");
+  jmethodID long_value_id = GetMethodID(jni, j_long_class, "longValue", "()J");
 
   for (jobject j_encoding_parameters : Iterable(jni, j_encodings)) {
     webrtc::RtpEncodingParameters encoding;
@@ -2350,6 +2354,13 @@ static void JavaRtpParametersToJsepRtpParameters(
     } else {
       encoding.max_bitrate_bps = kBitrateUnlimited;
     }
+    jobject j_ssrc =
+        GetNullableObjectField(jni, j_encoding_parameters, ssrc_id);
+    if (!IsNull(jni, j_ssrc)) {
+      jlong ssrc_value = jni->CallLongMethod(j_ssrc, long_value_id);
+      CHECK_EXCEPTION(jni) << "error during CallLongMethod";
+      encoding.ssrc = rtc::Optional<uint32_t>(ssrc_value);
+    }
     parameters->encodings.push_back(encoding);
   }
 
@@ -2394,9 +2405,13 @@ static jobject JsepRtpParametersToJavaRtpParameters(
       GetFieldID(jni, encoding_class, "active", "Z");
   jfieldID bitrate_id =
       GetFieldID(jni, encoding_class, "maxBitrateBps", "Ljava/lang/Integer;");
+  jfieldID ssrc_id =
+      GetFieldID(jni, encoding_class, "ssrc", "Ljava/lang/Long;");
 
   jclass integer_class = jni->FindClass("java/lang/Integer");
+  jclass long_class = jni->FindClass("java/lang/Long");
   jmethodID integer_ctor = GetMethodID(jni, integer_class, "<init>", "(I)V");
+  jmethodID long_ctor = GetMethodID(jni, long_class, "<init>", "(J)V");
 
   for (const webrtc::RtpEncodingParameters& encoding : parameters.encodings) {
     jobject j_encoding_parameters =
@@ -2411,6 +2426,13 @@ static jobject JsepRtpParametersToJavaRtpParameters(
       jni->SetObjectField(j_encoding_parameters, bitrate_id, j_bitrate_value);
       CHECK_EXCEPTION(jni) << "error during SetObjectField";
     }
+    if (encoding.ssrc) {
+      jobject j_ssrc_value = jni->NewObject(long_class, long_ctor,
+                                            static_cast<jlong>(*encoding.ssrc));
+      CHECK_EXCEPTION(jni) << "error during NewObject";
+      jni->SetObjectField(j_encoding_parameters, ssrc_id, j_ssrc_value);
+      CHECK_EXCEPTION(jni) << "error during SetObjectField";
+    }
     jboolean added = jni->CallBooleanMethod(j_encodings, encodings_add,
                                             j_encoding_parameters);
     CHECK_EXCEPTION(jni) << "error during CallBooleanMethod";

webrtc/sdk/objc/Framework/Classes/RTCRtpEncodingParameters.mm

@@ -14,6 +14,7 @@
 
 @synthesize isActive = _isActive;
 @synthesize maxBitrateBps = _maxBitrateBps;
+@synthesize ssrc = _ssrc;
 
 static const int kBitrateUnlimited = -1;
 
@@ -30,6 +31,9 @@ static const int kBitrateUnlimited = -1;
       _maxBitrateBps =
           [NSNumber numberWithInt:nativeParameters.max_bitrate_bps];
     }
+    if (nativeParameters.ssrc) {
+      _ssrc = [NSNumber numberWithUnsignedLong:*nativeParameters.ssrc];
+    }
   }
   return self;
 }
@@ -40,6 +44,9 @@ static const int kBitrateUnlimited = -1;
   if (_maxBitrateBps != nil) {
     parameters.max_bitrate_bps = _maxBitrateBps.intValue;
   }
+  if (_ssrc != nil) {
+    parameters.ssrc = rtc::Optional<uint32_t>(_ssrc.unsignedLongValue);
+  }
   return parameters;
 }
 

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCRtpEncodingParameters.h

@@ -25,6 +25,9 @@ RTC_EXPORT
  */
 @property(nonatomic, copy, nullable) NSNumber *maxBitrateBps;
 
+/** The SSRC being used by this encoding. */
+@property(nonatomic, readonly, nullable) NSNumber *ssrc;
+
 - (instancetype)init NS_DESIGNATED_INITIALIZER;
 
 @end