demux: adaptive: pass sequence to chunks

(cherry picked from commit 94e9250b)

modules/demux/adaptive/playlist/Segment.cpp

@@ -88,6 +88,7 @@ SegmentChunk* ISegment::toChunk(SharedResources *res, AbstractConnectionManager
         SegmentChunk *chunk = createChunk(source, rep);
         if(chunk)
         {
+            chunk->sequence = index;
             chunk->discontinuity = discontinuity;
             if(!prepareChunk(res, chunk, rep))
             {

modules/demux/adaptive/playlist/SegmentChunk.hpp

@@ -46,6 +46,7 @@ namespace adaptive
             void         setEncryptionSession(CommonEncryptionSession *);
             StreamFormat getStreamFormat() const;
             bool discontinuity;
+            uint64_t sequence;
 
         protected:
             bool         decrypt(block_t **);