MP4/WS protocol support.

Approx. 10% of code originally written by Roxlu, but keeping it split up during cleanup before merge proved practically impossible, so it's all merged into a single commit.

src/output/output_mp4.h

@@ -15,6 +15,9 @@ namespace Mist{
     uint64_t time;
     uint64_t byteOffset; // Stores relative bpos for fragmented MP4
     uint64_t index;
+    size_t sampleSize;
+    uint16_t sampleDuration;
+    uint16_t sampleOffset;
   };
 
   class SortSet{
@@ -95,22 +98,34 @@ namespace Mist{
                                         uint64_t endFragmentTime); // this builds the moof box for fragmented MP4
 
     void findSeekPoint(uint64_t byteStart, uint64_t &seekPoint, uint64_t headerSize);
-
+    void appendSinglePacketMoof(Util::ResizeablePointer& moofOut, size_t extraBytes = 0); 
+    size_t fragmentHeaderSize(std::deque<size_t>& sortedTracks, std::set<keyPart>& trunOrder, uint64_t startFragmentTime, uint64_t endFragmentTime);
     void onHTTP();
     void sendNext();
     void sendHeader();
+    bool doesWebsockets() { return true; }
+    void onWebsocketConnect();
+    void onWebsocketFrame();
+    void onIdle();
     virtual bool onFinish();
-
   protected:
+    void sendWebsocketCodecData(const std::string& type);
+    bool handleWebsocketSeek(JSON::Value& command);
+    bool handleWebsocketSetSpeed(JSON::Value& command);
+    bool stayLive;
+    double target_rate; ///< Target playback speed rate (1.0 = normal, 0 = auto)
+
     uint64_t fileSize;
     uint64_t byteStart;
     uint64_t byteEnd;
     int64_t leftOver;
     uint64_t currPos;
     uint64_t seekPoint;
+    uint64_t forwardTo;
 
     uint64_t nextHeaderTime;
     uint64_t headerSize;
+    size_t prevVidTrack;
 
     // variables for standard MP4
     std::set<keyPart> sortSet; // needed for unfragmented MP4, remembers the order of keyparts
@@ -135,6 +150,7 @@ namespace Mist{
     std::map<size_t, fragSet> currentPartSet;
 
     std::string protectionHeader(size_t idx);
+    Util::ResizeablePointer webBuf;
   };
 }// namespace Mist