SCAN_t: move to its own header

This is intended to reduce unnecessary transitive includes in
the H.264 and H.265 parsers, particularly "libavcodec/avcodec.h".

mythtv/libs/libmythtv/libmythtv.pro

@@ -148,6 +148,7 @@ HEADERS += recordingfile.h
 HEADERS += driveroption.h
 HEADERS += mythhdrvideometadata.h
 HEADERS += mythhdrtracker.h
+HEADERS += scantype.h
 
 SOURCES += bytereader.cpp
 SOURCES += recordinginfo.cpp

mythtv/libs/libmythtv/mpeg/H2645Parser.h

@@ -30,11 +30,11 @@
 #include "libmythbase/compat.h" // for uint on Darwin, MinGW
 #include "libmythbase/mythconfig.h"
 #include "libmythbase/mythlogging.h"
-#include "libmythtv/recorders/recorderbase.h" // for ScanType
+
+#include "libmythtv/scantype.h"
 
 class BitReader;
 class FrameRate;
-enum class SCAN_t : uint8_t;
 
 class H2645Parser {
   public:

mythtv/libs/libmythtv/recorders/dtvrecorder.h

@@ -17,6 +17,7 @@
 #include "libmythtv/mpeg/H2645Parser.h"
 #include "libmythtv/mpeg/streamlisteners.h"
 #include "libmythtv/recorders/recorderbase.h"
+#include "libmythtv/scantype.h"
 
 class MPEGStreamData;
 class TSPacket;

mythtv/libs/libmythtv/recorders/recorderbase.h

@@ -18,6 +18,7 @@
 #include "libmythtv/mythtvexp.h"
 #include "libmythtv/recordingfile.h"
 #include "libmythtv/recordingquality.h"
+#include "libmythtv/scantype.h"
 
 extern "C"
 {
@@ -52,13 +53,6 @@ class FrameRate
     uint m_den;
 };
 
-enum class SCAN_t : uint8_t {
-    UNKNOWN_SCAN,
-    INTERLACED,
-    PROGRESSIVE,
-    VARIABLE
-};
-
 /** \class RecorderBase
  *  \brief This is the abstract base class for supporting
  *         recorder hardware.

mythtv/libs/libmythtv/scantype.h

@@ -0,0 +1,11 @@
+#ifndef SCAN_TYPE_H_
+#define SCAN_TYPE_H_
+
+enum class SCAN_t : uint8_t {
+    UNKNOWN_SCAN,
+    INTERLACED,
+    PROGRESSIVE,
+    VARIABLE
+};
+
+#endif // SCAN_TYPE_H_