Fix stats hud in AppRTC Demo for iOS.

webrtc/examples/objc/AppRTCDemo/ARDStatsBuilder.m

 /*
  *  Copyright 2015 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.
  */
 
@@ skipping 178 matching lines @@
     } else if ([key isEqualToString:@"bytesSent"]) {
       NSInteger byteCount = value.integerValue;
       [_connSendBitrateTracker updateBitrateWithCurrentByteCount:byteCount];
       _connSendBitrate = _connSendBitrateTracker.bitrateString;
     }
   }];
 }
 
 - (void)parseSendSsrcStatsReport:(RTCStatsReport *)statsReport {
   NSDictionary *values = statsReport.values;
-  NSString *trackId = values[@"googTrackId"];
-  if (trackId.length && [trackId hasPrefix:@"ARDAMSv0"]) {
+  if ([values objectForKey:@"googFrameRateSent"]) {
     // Video track.
     [self parseVideoSendStatsReport:statsReport];
-  } else {
+  } else if ([values objectForKey:@"audioInputLevel"]) {
     // Audio track.
     [self parseAudioSendStatsReport:statsReport];
   }
 }
 
 - (void)parseAudioSendStatsReport:(RTCStatsReport *)statsReport {
   [statsReport.values enumerateKeysAndObjectsUsingBlock:^(
       NSString *key, NSString *value, BOOL *stop) {
     if ([key isEqualToString:@"googCodecName"]) {
       _audioSendCodec = value;
@@ skipping 27 matching lines @@
     } else if ([key isEqualToString:@"bytesSent"]) {
       NSInteger byteCount = value.integerValue;
       [_videoSendBitrateTracker updateBitrateWithCurrentByteCount:byteCount];
       _videoSendBitrate = _videoSendBitrateTracker.bitrateString;
     }
   }];
 }
 
 - (void)parseRecvSsrcStatsReport:(RTCStatsReport *)statsReport {
   NSDictionary *values = statsReport.values;
-  if (values[@"googFrameWidthReceived"]) {
+  if ([values objectForKey:@"googFrameWidthReceived"]) {
+    // Video track.
     [self parseVideoRecvStatsReport:statsReport];
-  } else {
+  } else if ([values objectForKey:@"audioOutputLevel"]) {
+    // Audio track.
     [self parseAudioRecvStatsReport:statsReport];
   }
 }
 
 - (void)parseAudioRecvStatsReport:(RTCStatsReport *)statsReport {
   [statsReport.values enumerateKeysAndObjectsUsingBlock:^(
       NSString *key, NSString *value, BOOL *stop) {
     if ([key isEqualToString:@"googCodecName"]) {
       _audioRecvCodec = value;
     } else if ([key isEqualToString:@"bytesReceived"]) {
@@ skipping 26 matching lines @@
     } else if ([key isEqualToString:@"bytesReceived"]) {
       NSInteger byteCount = value.integerValue;
       [_videoRecvBitrateTracker updateBitrateWithCurrentByteCount:byteCount];
       _videoRecvBitrate = _videoRecvBitrateTracker.bitrateString;
     }
   }];
 }
 
 @end