Remove cricket::RtpTransceiverDirection

Replaces cricket::RtpTransceiverDirection with
webrtc::RtpTransceiverDirection, which is part of the public API.

Bug: webrtc:8558
Change-Id: Ibfc9373e25187e98fb969e7ac937a1371c8fa4c7
Reviewed-on: https://webrtc-review.googlesource.com/24129
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Reviewed-by: Zhi Huang <zhihuang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20899}

pc/rtpmediautils.cc

@@ -0,0 +1,53 @@
+/*
+ *  Copyright 2017 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.
+ */
+
+#include "pc/rtpmediautils.h"
+
+namespace webrtc {
+
+RtpTransceiverDirection RtpTransceiverDirectionFromSendRecv(bool send,
+                                                            bool recv) {
+  if (send && recv) {
+    return RtpTransceiverDirection::kSendRecv;
+  } else if (send && !recv) {
+    return RtpTransceiverDirection::kSendOnly;
+  } else if (!send && recv) {
+    return RtpTransceiverDirection::kRecvOnly;
+  } else {
+    return RtpTransceiverDirection::kInactive;
+  }
+}
+
+bool RtpTransceiverDirectionHasSend(RtpTransceiverDirection direction) {
+  return direction == RtpTransceiverDirection::kSendRecv ||
+         direction == RtpTransceiverDirection::kSendOnly;
+}
+
+bool RtpTransceiverDirectionHasRecv(RtpTransceiverDirection direction) {
+  return direction == RtpTransceiverDirection::kSendRecv ||
+         direction == RtpTransceiverDirection::kRecvOnly;
+}
+
+RtpTransceiverDirection RtpTransceiverDirectionReversed(
+    RtpTransceiverDirection direction) {
+  switch (direction) {
+    case RtpTransceiverDirection::kSendRecv:
+    case RtpTransceiverDirection::kInactive:
+      return direction;
+    case RtpTransceiverDirection::kSendOnly:
+      return RtpTransceiverDirection::kRecvOnly;
+    case RtpTransceiverDirection::kRecvOnly:
+      return RtpTransceiverDirection::kSendOnly;
+  }
+  RTC_NOTREACHED();
+  return direction;
+}
+
+}  // namespace webrtc