Media: harden TrackID handling.

3 files changed, 94 insertions, 27 deletions

diff --git a/dom/media/mediasink/DecodedStream.cpp b/dom/media/mediasink/DecodedStream.cpp
index 9501a6cde..00bc5ea49 100644
--- a/dom/media/mediasink/DecodedStream.cpp
+++ b/dom/media/mediasink/DecodedStream.cpp
@@ -181,17 +181,22 @@ DecodedStreamData::DecodedStreamData(OutputStreamManager* aOutputStreamManager,
   , mOutputStreamManager(aOutputStreamManager)
 {
   mStream->AddListener(mListener);
-  mOutputStreamManager->Connect(mStream);
+  TrackID audioTrack = TRACK_NONE;
+  TrackID videoTrack = TRACK_NONE;
 
   // Initialize tracks.
   if (aInit.mInfo.HasAudio()) {
-    mStream->AddAudioTrack(aInit.mInfo.mAudio.mTrackId,
+    audioTrack = aInit.mInfo.mAudio.mTrackId;
+    mStream->AddAudioTrack(audioTrack,
                            aInit.mInfo.mAudio.mRate,
                            0, new AudioSegment());
   }
   if (aInit.mInfo.HasVideo()) {
-    mStream->AddTrack(aInit.mInfo.mVideo.mTrackId, 0, new VideoSegment());
+    videoTrack = aInit.mInfo.mVideo.mTrackId;
+    mStream->AddTrack(videoTrack, 0, new VideoSegment());
   }
+
+  mOutputStreamManager->Connect(mStream, audioTrack, videoTrack);
 }
 
 DecodedStreamData::~DecodedStreamData()
diff --git a/dom/media/mediasink/OutputStreamManager.cpp b/dom/media/mediasink/OutputStreamManager.cpp
index d5685837a..7ecc203ed 100644
--- a/dom/media/mediasink/OutputStreamManager.cpp
+++ b/dom/media/mediasink/OutputStreamManager.cpp
@@ -13,29 +13,41 @@ OutputStreamData::~OutputStreamData()
 {
   MOZ_ASSERT(NS_IsMainThread());
   // Break the connection to the input stream if necessary.
-  if (mPort) {
-    mPort->Destroy();
+  for (RefPtr<MediaInputPort>& port : mPorts) {
+    port->Destroy();
   }
 }
 
 void
-OutputStreamData::Init(OutputStreamManager* aOwner, ProcessedMediaStream* aStream)
+OutputStreamData::Init(OutputStreamManager* aOwner,
+                       ProcessedMediaStream* aStream,
+                       TrackID aNextAvailableTrackID)
 {
   mOwner = aOwner;
   mStream = aStream;
+  mNextAvailableTrackID = aNextAvailableTrackID;
 }
 
 bool
-OutputStreamData::Connect(MediaStream* aStream)
+OutputStreamData::Connect(MediaStream* aStream,
+                          TrackID aInputAudioTrackID,
+                          TrackID aInputVideoTrackID)
 {
   MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(!mPort, "Already connected?");
+  MOZ_ASSERT(mPorts.IsEmpty(), "Already connected?");
 
   if (mStream->IsDestroyed()) {
     return false;
   }
 
-  mPort = mStream->AllocateInputPort(aStream);
+  for (TrackID tid : {aInputAudioTrackID, aInputVideoTrackID}) {
+    if (tid == TRACK_NONE) {
+      continue;
+    }
+    MOZ_ASSERT(IsTrackIDExplicit(tid));
+    mPorts.AppendElement(mStream->AllocateInputPort(
+        aStream, tid, mNextAvailableTrackID++));
+  }
   return true;
 }
 
@@ -51,11 +63,11 @@ OutputStreamData::Disconnect()
     return false;
   }
 
-  // Disconnect the existing port if necessary.
-  if (mPort) {
-    mPort->Destroy();
-    mPort = nullptr;
+  // Disconnect any existing port.
+  for (RefPtr<MediaInputPort>& port : mPorts) {
+    port->Destroy();
   }
+  mPorts.Clear();
   return true;
 }
 
@@ -71,8 +83,16 @@ OutputStreamData::Graph() const
   return mStream->Graph();
 }
 
+TrackID
+OutputStreamData::NextAvailableTrackID() const
+{
+  return mNextAvailableTrackID;
+}
+
 void
-OutputStreamManager::Add(ProcessedMediaStream* aStream, bool aFinishWhenEnded)
+OutputStreamManager::Add(ProcessedMediaStream* aStream,
+                         TrackID aNextAvailableTrackID,
+                         bool aFinishWhenEnded)
 {
   MOZ_ASSERT(NS_IsMainThread());
   // All streams must belong to the same graph.
@@ -84,12 +104,12 @@ OutputStreamManager::Add(ProcessedMediaStream* aStream, bool aFinishWhenEnded)
   }
 
   OutputStreamData* p = mStreams.AppendElement();
-  p->Init(this, aStream);
+  p->Init(this, aStream, aNextAvailableTrackID);
 
   // Connect to the input stream if we have one. Otherwise the output stream
   // will be connected in Connect().
   if (mInputStream) {
-    p->Connect(mInputStream);
+    p->Connect(mInputStream, mInputAudioTrackID, mInputVideoTrackID);
   }
 }
 
@@ -106,12 +126,35 @@ OutputStreamManager::Remove(MediaStream* aStream)
 }
 
 void
-OutputStreamManager::Connect(MediaStream* aStream)
+OutputStreamManager::Clear()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  mStreams.Clear();
+}
+
+TrackID
+OutputStreamManager::NextAvailableTrackIDFor(MediaStream* aOutputStream) const
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  for (const OutputStreamData& out : mStreams) {
+    if (out.Equals(aOutputStream)) {
+      return out.NextAvailableTrackID();
+    }
+  }
+  return TRACK_INVALID;
+}
+
+void
+OutputStreamManager::Connect(MediaStream* aStream,
+                             TrackID aAudioTrackID,
+                             TrackID aVideoTrackID)
 {
   MOZ_ASSERT(NS_IsMainThread());
   mInputStream = aStream;
+  mInputAudioTrackID = aAudioTrackID;
+  mInputVideoTrackID = aVideoTrackID;
   for (int32_t i = mStreams.Length() - 1; i >= 0; --i) {
-    if (!mStreams[i].Connect(aStream)) {
+    if (!mStreams[i].Connect(aStream, mInputAudioTrackID, mInputVideoTrackID)) {
       // Probably the DOMMediaStream was GCed. Clean up.
       mStreams.RemoveElementAt(i);
     }
@@ -123,6 +166,8 @@ OutputStreamManager::Disconnect()
 {
   MOZ_ASSERT(NS_IsMainThread());
   mInputStream = nullptr;
+  mInputAudioTrackID = TRACK_INVALID;
+  mInputVideoTrackID = TRACK_INVALID;
   for (int32_t i = mStreams.Length() - 1; i >= 0; --i) {
     if (!mStreams[i].Disconnect()) {
       // Probably the DOMMediaStream was GCed. Clean up.
diff --git a/dom/media/mediasink/OutputStreamManager.h b/dom/media/mediasink/OutputStreamManager.h
index 7f91a60c1..941a86cf0 100644
--- a/dom/media/mediasink/OutputStreamManager.h
+++ b/dom/media/mediasink/OutputStreamManager.h
@@ -9,6 +9,7 @@
 
 #include "mozilla/RefPtr.h"
 #include "nsTArray.h"
+#include "MediaSegment.h"
 
 namespace mozilla {
 
@@ -21,11 +22,13 @@ class ProcessedMediaStream;
 class OutputStreamData {
 public:
   ~OutputStreamData();
-  void Init(OutputStreamManager* aOwner, ProcessedMediaStream* aStream);
+  void Init(OutputStreamManager* aOwner,
+            ProcessedMediaStream* aStream,
+            TrackID aNextAvailableTrackID);
 
-  // Connect mStream to the input stream.
+  // Connect the given input stream's audio and video tracks to mStream.
   // Return false is mStream is already destroyed, otherwise true.
-  bool Connect(MediaStream* aStream);
+  bool Connect(MediaStream* aStream, TrackID aAudioTrackID, TrackID aVideoTrackID);
   // Disconnect mStream from its input stream.
   // Return false is mStream is already destroyed, otherwise true.
   bool Disconnect();
@@ -34,12 +37,16 @@ public:
   bool Equals(MediaStream* aStream) const;
   // Return the graph mStream belongs to.
   MediaStreamGraph* Graph() const;
+  // The next TrackID that will not cause a collision in mStream.
+  TrackID NextAvailableTrackID() const;
 
 private:
   OutputStreamManager* mOwner;
   RefPtr<ProcessedMediaStream> mStream;
-  // mPort connects our mStream to an input stream.
-  RefPtr<MediaInputPort> mPort;
+  // mPort connects an input stream to our mStream.
+  nsTArray<RefPtr<MediaInputPort>> mPorts;
+  // For guaranteeing TrackID uniqueness in our mStream.
+  TrackID mNextAvailableTrackID = TRACK_INVALID;
 };
 
 class OutputStreamManager {
@@ -47,18 +54,26 @@ class OutputStreamManager {
 
 public:
   // Add the output stream to the collection.
-  void Add(ProcessedMediaStream* aStream, bool aFinishWhenEnded);
+  void Add(ProcessedMediaStream* aStream,
+           TrackID aNextAvailableTrackID,
+           bool aFinishWhenEnded);
   // Remove the output stream from the collection.
   void Remove(MediaStream* aStream);
+  // Clear all output streams from the collection.
+  void Clear();
+  // The next TrackID that will not cause a collision in aOutputStream.
+  TrackID NextAvailableTrackIDFor(MediaStream* aOutputStream) const;
   // Return true if the collection empty.
   bool IsEmpty() const
   {
     MOZ_ASSERT(NS_IsMainThread());
     return mStreams.IsEmpty();
   }
-  // Connect all output streams in the collection to the input stream.
-  void Connect(MediaStream* aStream);
-  // Disconnect all output streams from the input stream.
+  // Connect the given input stream's tracks to all output streams.
+  void Connect(MediaStream* aStream,
+               TrackID aAudioTrackID,
+               TrackID aVideoTrackID);
+  // Disconnect the input stream to all output streams.
   void Disconnect();
   // Return the graph these streams belong to or null if empty.
   MediaStreamGraph* Graph() const
@@ -72,6 +87,8 @@ private:
   // Keep the input stream so we can connect the output streams that
   // are added after Connect().
   RefPtr<MediaStream> mInputStream;
+  TrackID mInputAudioTrackID = TRACK_INVALID;
+  TrackID mInputVideoTrackID = TRACK_INVALID;
   nsTArray<OutputStreamData> mStreams;
 };