dash: Allow SegmentTimeline to be queried for a "S" element.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 8158205e)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_filter/dash/mpd/SegmentTimeline.cpp

@@ -26,6 +26,8 @@
 #include <vlc_common.h>
 #include <vlc_arrays.h>
 
+#include <iostream>
+
 using namespace dash::mpd;
 
 SegmentTimeline::SegmentTimeline() :
@@ -53,6 +55,28 @@ void dash::mpd::SegmentTimeline::addElement(dash::mpd::SegmentTimeline::Element
     this->elements.push_back( e );
 }
 
+const SegmentTimeline::Element*    SegmentTimeline::getElement( mtime_t dts ) const
+{
+    if ( this->elements.size() == 0 )
+        return NULL;
+    int64_t     targetT = dts * this->timescale / 1000000;
+    targetT -= this->elements.front()->t;
+
+    std::list<Element*>::const_iterator     it = this->elements.begin();
+    std::list<Element*>::const_iterator     end = this->elements.end();
+    const Element*  res = NULL;
+
+    while ( it != end )
+    {
+        if ( (*it)->t > targetT )
+            return res;
+        res = *it;
+        ++it;
+    }
+    std::cerr << "No more element to be used." << std::endl;
+    return NULL;
+}
+
 dash::mpd::SegmentTimeline::Element::Element() :
     r( 0 )
 {

modules/stream_filter/dash/mpd/SegmentTimeline.h

@@ -27,6 +27,7 @@
 #include <sys/types.h>
 #include <list>
 #include <stdint.h>
+#include <vlc_common.h>
 
 namespace dash
 {
@@ -47,6 +48,7 @@ namespace dash
                 int                     getTimescale() const;
                 void                    setTimescale( int timescale );
                 void                    addElement( Element* e );
+                const Element*          getElement( mtime_t dts ) const;
 
             private:
                 int                     timescale;