fix usage of non default srtp key

.cproject

@@ -238,6 +238,14 @@
 						<useDefaultCommand>true</useDefaultCommand>
 						<runAllBuilders>true</runAllBuilders>
 					</target>
+					<target name="doc" path="mediastreamer2/help" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
+						<buildCommand>make</buildCommand>
+						<buildArguments/>
+						<buildTarget>all</buildTarget>
+						<stopOnError>true</stopOnError>
+						<useDefaultCommand>true</useDefaultCommand>
+						<runAllBuilders>true</runAllBuilders>
+					</target>
 				</buildTargets>
 			</storageModule>
 		</cconfiguration>

coreapi/linphonecall.c

@@ -1039,7 +1039,15 @@ static bool_t linphone_call_sound_resources_available(LinphoneCall *call){
 	return !linphone_core_is_in_conference(lc) && 
 		(current==NULL || current==call);
 }
-
+static int find_crypto_index_from_tag(SalSrtpCryptoAlgo crypto[],unsigned char tag) {
+	int i;
+	for(i=0; i<SAL_CRYPTO_ALGO_MAX; i++) {
+		if (crypto[i].tag == tag) {
+			return i;
+		}
+	}
+	return -1;
+}
 static void linphone_call_start_audio_stream(LinphoneCall *call, const char *cname, bool_t muted, bool_t send_ringbacktone, bool_t use_arc){
 	LinphoneCore *lc=call->core;
 	int jitt_comp=lc->rtp_conf.audio_jitt_comp;
@@ -1130,11 +1138,10 @@ static void linphone_call_start_audio_stream(LinphoneCall *call, const char *cna
 			if (stream->proto == SalProtoRtpSavp) {
 				const SalStreamDescription *local_st_desc=sal_media_description_find_stream(call->localdesc,
 	    					SalProtoRtpSavp,SalAudio);
-	    					
 				audio_stream_enable_strp(
 					call->audiostream, 
 					stream->crypto[0].algo,
-					local_st_desc->crypto[0].master_key,
+					local_st_desc->crypto[find_crypto_index_from_tag(local_st_desc->crypto,stream->crypto[0].tag)].master_key,
 					stream->crypto[0].master_key);
 				call->audiostream_encrypted=TRUE;
 			}else call->audiostream_encrypted=FALSE;

coreapi/offeranswer.c

@@ -142,8 +142,8 @@ static bool_t match_crypto_algo(const SalSrtpCryptoAlgo* local, const SalSrtpCry
 					strncpy(result->master_key, local[j].master_key, 41);
 					result->tag = local[j].tag;
 				} else {
-					strncpy(result->master_key, remote[j].master_key, 41);
-					result->tag = remote[j].tag;
+					strncpy(result->master_key, remote[i].master_key, 41);
+					result->tag = remote[i].tag;
 				}
 				result->master_key[40] = '\0';
 				return TRUE;

oRTP @ 758150c3

-Subproject commit 070d30dd75940b8c2e5898246437e213a47e834c
+Subproject commit 758150c3cd0f5a3a7a087247d6ff2dd198435fe7