1 files changed, 220 insertions, 0 deletions
diff --git a/dom/media/webrtc/jsep/JsepTransceiver.h b/dom/media/webrtc/jsep/JsepTransceiver.h
new file mode 100644
index 0000000000..45afcee04f
--- /dev/null
+++ b/dom/media/webrtc/jsep/JsepTransceiver.h
@@ -0,0 +1,220 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _JSEPTRANSCEIVER_H_
+#define _JSEPTRANSCEIVER_H_
+
+#include <string>
+
+#include "sdp/SdpAttribute.h"
+#include "sdp/SdpMediaSection.h"
+#include "sdp/Sdp.h"
+#include "jsep/JsepTransport.h"
+#include "jsep/JsepTrack.h"
+
+#include "nsError.h"
+
+namespace mozilla {
+
+class JsepUuidGenerator {
+ public:
+  virtual ~JsepUuidGenerator() = default;
+  virtual bool Generate(std::string* id) = 0;
+  virtual JsepUuidGenerator* Clone() const = 0;
+};
+
+class JsepTransceiver {
+ public:
+  explicit JsepTransceiver(SdpMediaSection::MediaType type,
+                           JsepUuidGenerator& aUuidGen,
+                           SdpDirectionAttribute::Direction jsDirection =
+                               SdpDirectionAttribute::kSendrecv)
+      : mJsDirection(jsDirection),
+        mSendTrack(type, sdp::kSend),
+        mRecvTrack(type, sdp::kRecv) {
+    if (!aUuidGen.Generate(&mUuid)) {
+      MOZ_CRASH();
+    }
+  }
+
+  JsepTransceiver(const JsepTransceiver& orig) = default;
+  JsepTransceiver(JsepTransceiver&& orig) = default;
+  JsepTransceiver& operator=(const JsepTransceiver& aRhs) = default;
+  JsepTransceiver& operator=(JsepTransceiver&& aRhs) = default;
+
+  ~JsepTransceiver() = default;
+
+  void Rollback(JsepTransceiver& oldTransceiver, bool aRemote) {
+    MOZ_ASSERT(oldTransceiver.GetMediaType() == GetMediaType());
+    MOZ_ASSERT(!oldTransceiver.IsNegotiated() || !oldTransceiver.HasLevel() ||
+               !HasLevel() || oldTransceiver.GetLevel() == GetLevel());
+    mTransport = oldTransceiver.mTransport;
+    if (aRemote) {
+      mLevel = oldTransceiver.mLevel;
+      mBundleLevel = oldTransceiver.mBundleLevel;
+      mSendTrack = oldTransceiver.mSendTrack;
+    }
+    mRecvTrack = oldTransceiver.mRecvTrack;
+
+    // Don't allow rollback to re-associate a transceiver.
+    if (!oldTransceiver.IsAssociated()) {
+      Disassociate();
+    }
+  }
+
+  bool IsAssociated() const { return !mMid.empty(); }
+
+  const std::string& GetMid() const {
+    MOZ_ASSERT(IsAssociated());
+    return mMid;
+  }
+
+  void Associate(const std::string& mid) {
+    MOZ_ASSERT(HasLevel());
+    mMid = mid;
+  }
+
+  void Disassociate() { mMid.clear(); }
+
+  bool HasLevel() const { return mLevel != SIZE_MAX; }
+
+  void SetLevel(size_t level) {
+    MOZ_ASSERT(level != SIZE_MAX);
+    MOZ_ASSERT(!HasLevel());
+    MOZ_ASSERT(!IsStopped());
+
+    mLevel = level;
+  }
+
+  void ClearLevel() {
+    MOZ_ASSERT(!IsAssociated());
+    mLevel = SIZE_MAX;
+    mBundleLevel = SIZE_MAX;
+  }
+
+  size_t GetLevel() const {
+    MOZ_ASSERT(HasLevel());
+    return mLevel;
+  }
+
+  void Stop() { mStopping = true; }
+
+  bool IsStopping() const { return mStopping; }
+
+  bool IsStopped() const { return mStopped; }
+
+  void SetStopped() { mStopped = true; }
+
+  bool IsFreeToUse() const { return !mStopping && !mStopped && !HasLevel(); }
+
+  void RestartDatachannelTransceiver() {
+    MOZ_RELEASE_ASSERT(GetMediaType() == SdpMediaSection::kApplication);
+    mStopping = false;
+    mStopped = false;
+    mCanRecycleMyMsection = false;
+  }
+
+  void SetRemoved() { mRemoved = true; }
+
+  bool IsRemoved() const { return mRemoved; }
+
+  bool HasBundleLevel() const { return mBundleLevel != SIZE_MAX; }
+
+  size_t BundleLevel() const {
+    MOZ_ASSERT(HasBundleLevel());
+    return mBundleLevel;
+  }
+
+  void SetBundleLevel(size_t aBundleLevel) {
+    MOZ_ASSERT(aBundleLevel != SIZE_MAX);
+    mBundleLevel = aBundleLevel;
+  }
+
+  void ClearBundleLevel() { mBundleLevel = SIZE_MAX; }
+
+  size_t GetTransportLevel() const {
+    MOZ_ASSERT(HasLevel());
+    if (HasBundleLevel()) {
+      return BundleLevel();
+    }
+    return GetLevel();
+  }
+
+  void SetAddTrackMagic() { mAddTrackMagic = true; }
+
+  bool HasAddTrackMagic() const { return mAddTrackMagic; }
+
+  void SetOnlyExistsBecauseOfSetRemote(bool aValue) {
+    mOnlyExistsBecauseOfSetRemote = aValue;
+  }
+
+  bool OnlyExistsBecauseOfSetRemote() const {
+    return mOnlyExistsBecauseOfSetRemote;
+  }
+
+  void SetNegotiated() {
+    MOZ_ASSERT(IsAssociated());
+    MOZ_ASSERT(HasLevel());
+    mNegotiated = true;
+  }
+
+  bool IsNegotiated() const { return mNegotiated; }
+
+  void SetCanRecycleMyMsection() { mCanRecycleMyMsection = true; }
+
+  bool CanRecycleMyMsection() const { return mCanRecycleMyMsection; }
+
+  const std::string& GetUuid() const { return mUuid; }
+
+  // Convenience function
+  SdpMediaSection::MediaType GetMediaType() const {
+    MOZ_ASSERT(mRecvTrack.GetMediaType() == mSendTrack.GetMediaType());
+    return mRecvTrack.GetMediaType();
+  }
+
+  bool HasTransport() const { return mTransport.mComponents != 0; }
+
+  bool HasOwnTransport() const {
+    if (HasTransport() &&
+        (!HasBundleLevel() || (GetLevel() == BundleLevel()))) {
+      return true;
+    }
+    return false;
+  }
+
+  // See Bug 1642419, this can be removed when all sites are working with RTX.
+  void SetRtxIsAllowed(bool aRtxIsAllowed) {
+    mSendTrack.SetRtxIsAllowed(aRtxIsAllowed);
+    mRecvTrack.SetRtxIsAllowed(aRtxIsAllowed);
+  }
+
+  // This is the direction JS wants. It might not actually happen.
+  SdpDirectionAttribute::Direction mJsDirection;
+
+  JsepTrack mSendTrack;
+  JsepTrack mRecvTrack;
+  JsepTransport mTransport;
+
+ private:
+  std::string mUuid;
+  // Stuff that is not negotiated
+  std::string mMid;
+  size_t mLevel = SIZE_MAX;  // SIZE_MAX if no level
+  // Is this track pair sharing a transport with another?
+  size_t mBundleLevel = SIZE_MAX;  // SIZE_MAX if no bundle level
+  // The w3c and IETF specs have a lot of "magical" behavior that happens
+  // when addTrack is used to create a transceiver. This was a deliberate
+  // design choice. Sadface.
+  bool mAddTrackMagic = false;
+  bool mOnlyExistsBecauseOfSetRemote = false;
+  bool mStopping = false;
+  bool mStopped = false;
+  bool mRemoved = false;
+  bool mNegotiated = false;
+  bool mCanRecycleMyMsection = false;
+};
+
+}  // namespace mozilla
+
+#endif  // _JSEPTRANSCEIVER_H_