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util/MP4/box_afra.cpp

@@ -0,0 +1,75 @@
+#include "box.cpp"
+#include <vector>
+
+struct afra_record {
+  uint32_t Time;
+  uint32_t Offset;
+};//afra_record
+
+class Box_afra {
+  public:
+    Box_afra( );
+    ~Box_afra();
+    Box * GetBox();
+    void SetTimeScale( uint32_t Scale = 1 );
+    void AddEntry( uint32_t Time = 0, uint32_t SampleOffset = 0, uint32_t Offset = 0 );
+    void WriteContent( );
+  private:
+    void SetReserved( );
+    void SetDefaults( );
+    
+    Box * Container;
+    uint32_t CurrentTimeScale;
+    std::vector<afra_record> Entries;
+};//Box_ftyp Class
+
+Box_afra::Box_afra( ) {
+  Container = new Box( 0x61667261 );
+  SetReserved( );
+  SetDefaults( );
+}
+
+Box_afra::~Box_afra() {
+  delete Container;
+}
+
+Box * Box_afra::GetBox() {
+  return Container;
+}
+
+void Box_afra::SetDefaults( ) {
+  SetTimeScale( );
+}
+
+void Box_afra::SetReserved( ) {
+  uint8_t * temp = new uint8_t[1];
+  temp[0] = 0;
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0),1);
+  Container->SetPayload((uint32_t)1,temp);
+}
+
+void Box_afra::SetTimeScale( uint32_t Scale ) {
+  CurrentTimeScale = Scale;
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Scale),5);
+}
+
+void Box_afra::AddEntry( uint32_t Time, uint32_t SampleOffset, uint32_t Offset ) {
+  if(Offset >= Entries.size()) {
+    Entries.resize(Offset+1);
+  }
+  Entries[Offset].Time = Time;
+  Entries[Offset].Offset = SampleOffset;
+}
+
+void Box_afra::WriteContent( ) {
+  Container->ResetPayload();
+  SetReserved( );
+  if(!Entries.empty()) {
+    for(int32_t i = Entries.size() -1; i >= 0; i--) {
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Entries[i].Offset),(i*12)+21);
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Entries[i].Time),(i*12)+17);
+      Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0),(i*12)+13);
+    }
+  }
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(Entries.size()),9);
+}