Change NAL unit type defines to an enum and move to a header file for usage

in other code.

Originally committed as revision 7226 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -165,20 +165,6 @@ typedef struct H264Context{
     MpegEncContext s;
     int nal_ref_idc;
     int nal_unit_type;
-#define NAL_SLICE                1
-#define NAL_DPA                  2
-#define NAL_DPB                  3
-#define NAL_DPC                  4
-#define NAL_IDR_SLICE            5
-#define NAL_SEI                  6
-#define NAL_SPS                  7
-#define NAL_PPS                  8
-#define NAL_AUD                  9
-#define NAL_END_SEQUENCE        10
-#define NAL_END_STREAM          11
-#define NAL_FILLER_DATA         12
-#define NAL_SPS_EXT             13
-#define NAL_AUXILIARY_SLICE     19
     uint8_t *rbsp_buffer;
     unsigned int rbsp_buffer_size;
 

libavcodec/h264data.h

@@ -53,6 +53,24 @@
 
 #define EXTENDED_SAR          255
 
+/* NAL unit types */
+enum {
+NAL_SLICE=1,
+NAL_DPA,
+NAL_DPB,
+NAL_DPC,
+NAL_IDR_SLICE,
+NAL_SEI,
+NAL_SPS,
+NAL_PPS,
+NAL_AUD,
+NAL_END_SEQUENCE,
+NAL_END_STREAM,
+NAL_FILLER_DATA,
+NAL_SPS_EXT,
+NAL_AUXILIARY_SLICE=19
+};
+
 static const AVRational pixel_aspect[14]={
  {0, 1},
  {1, 1},