avcodec/tiff: add initial bayer and sub image support

libavcodec/tiff.h

@@ -70,18 +70,22 @@ enum TiffTags {
     TIFF_TILE_LENGTH        = 0x143,
     TIFF_TILE_OFFSETS       = 0x144,
     TIFF_TILE_BYTE_COUNTS   = 0x145,
+    TIFF_SUB_IFDS           = 0x14A,
     TIFF_EXTRASAMPLES       = 0x152,
     TIFF_YCBCR_COEFFICIENTS = 0x211,
     TIFF_YCBCR_SUBSAMPLING  = 0x212,
     TIFF_YCBCR_POSITIONING  = 0x213,
     TIFF_REFERENCE_BW       = 0x214,
+    TIFF_CFA_PATTERN_DIM    = 0x828D,
+    TIFF_CFA_PATTERN        = 0x828E,
     TIFF_COPYRIGHT          = 0x8298,
     TIFF_MODEL_TIEPOINT     = 0x8482,
     TIFF_MODEL_PIXEL_SCALE  = 0x830E,
     TIFF_MODEL_TRANSFORMATION= 0x8480,
     TIFF_GEO_KEY_DIRECTORY  = 0x87AF,
     TIFF_GEO_DOUBLE_PARAMS  = 0x87B0,
-    TIFF_GEO_ASCII_PARAMS   = 0x87B1
+    TIFF_GEO_ASCII_PARAMS   = 0x87B1,
+    TIFF_WHITE_LEVEL        = 0xC61D,
 };
 
 /** list of TIFF compression types */