Revert of Rename AppRTCDemo on Android and iOS to AppRTCMobile

webrtc/examples/objc/AppRTCDemo/ARDSDPUtils.m

Index: webrtc/examples/objc/AppRTCDemo/ARDSDPUtils.m
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDSDPUtils.m b/webrtc/examples/objc/AppRTCDemo/ARDSDPUtils.m
new file mode 100644
index 0000000000000000000000000000000000000000..3a8a578dc68fccf47cab303d315866749a494893
--- /dev/null
+++ b/webrtc/examples/objc/AppRTCDemo/ARDSDPUtils.m
@@ -0,0 +1,92 @@
+/*
+ *  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.
+ */
+
+#import "ARDSDPUtils.h"
+
+#import "WebRTC/RTCLogging.h"
+#import "WebRTC/RTCSessionDescription.h"
+
+@implementation ARDSDPUtils
+
++ (RTCSessionDescription *)
+    descriptionForDescription:(RTCSessionDescription *)description
+          preferredVideoCodec:(NSString *)codec {
+  NSString *sdpString = description.sdp;
+  NSString *lineSeparator = @"\n";
+  NSString *mLineSeparator = @" ";
+  // Copied from PeerConnectionClient.java.
+  // TODO(tkchin): Move this to a shared C++ file.
+  NSMutableArray *lines =
+      [NSMutableArray arrayWithArray:
+          [sdpString componentsSeparatedByString:lineSeparator]];
+  NSInteger mLineIndex = -1;
+  NSString *codecRtpMap = nil;
+  // a=rtpmap:<payload type> <encoding name>/<clock rate>
+  // [/<encoding parameters>]
+  NSString *pattern =
+      [NSString stringWithFormat:@"^a=rtpmap:(\\d+) %@(/\\d+)+[\r]?$", codec];
+  NSRegularExpression *regex =
+      [NSRegularExpression regularExpressionWithPattern:pattern
+                                                options:0
+                                                  error:nil];
+  for (NSInteger i = 0; (i < lines.count) && (mLineIndex == -1 || !codecRtpMap);
+       ++i) {
+    NSString *line = lines[i];
+    if ([line hasPrefix:@"m=video"]) {
+      mLineIndex = i;
+      continue;
+    }
+    NSTextCheckingResult *codecMatches =
+        [regex firstMatchInString:line
+                          options:0
+                            range:NSMakeRange(0, line.length)];
+    if (codecMatches) {
+      codecRtpMap =
+          [line substringWithRange:[codecMatches rangeAtIndex:1]];
+      continue;
+    }
+  }
+  if (mLineIndex == -1) {
+    RTCLog(@"No m=video line, so can't prefer %@", codec);
+    return description;
+  }
+  if (!codecRtpMap) {
+    RTCLog(@"No rtpmap for %@", codec);
+    return description;
+  }
+  NSArray *origMLineParts =
+      [lines[mLineIndex] componentsSeparatedByString:mLineSeparator];
+  if (origMLineParts.count > 3) {
+    NSMutableArray *newMLineParts =
+        [NSMutableArray arrayWithCapacity:origMLineParts.count];
+    NSInteger origPartIndex = 0;
+    // Format is: m=<media> <port> <proto> <fmt> ...
+    [newMLineParts addObject:origMLineParts[origPartIndex++]];
+    [newMLineParts addObject:origMLineParts[origPartIndex++]];
+    [newMLineParts addObject:origMLineParts[origPartIndex++]];
+    [newMLineParts addObject:codecRtpMap];
+    for (; origPartIndex < origMLineParts.count; ++origPartIndex) {
+      if (![codecRtpMap isEqualToString:origMLineParts[origPartIndex]]) {
+        [newMLineParts addObject:origMLineParts[origPartIndex]];
+      }
+    }
+    NSString *newMLine =
+        [newMLineParts componentsJoinedByString:mLineSeparator];
+    [lines replaceObjectAtIndex:mLineIndex
+                     withObject:newMLine];
+  } else {
+    RTCLogWarning(@"Wrong SDP media description format: %@", lines[mLineIndex]);
+  }
+  NSString *mangledSdpString = [lines componentsJoinedByString:lineSeparator];
+  return [[RTCSessionDescription alloc] initWithType:description.type
+                                                 sdp:mangledSdpString];
+}
+
+@end