Add RGGB (Bayer) color space and YDgCoCg-R transformation

Author: JeromeMartinez

ffv1.md

@@ -1021,9 +1021,11 @@ Parameters( ) {                                               |
     colorspace_type                                           | ur
     if (version >= 1)                                         |
         bits_per_raw_sample                                   | ur
-    chroma_planes                                             | br
-    log2_h_chroma_subsample                                   | ur
-    log2_v_chroma_subsample                                   | ur
+    if (colorspace_type <= 1) {                               |
+        chroma_planes                                         | br
+        log2( h_chroma_subsample )                            | ur
+        log2( v_chroma_subsample )                            | ur
+    }                                                         |
     alpha_plane                                               | br
     if (version >= 3) {                                       |
         num_h_slices - 1                                      | ur
@@ -1112,6 +1114,7 @@ If state_transition_delta is not present in the FFV1 bitstream, all Range coder
 |-------|:--------------------------------|:--------------------------------|:--------------------------------|
 | 0     | YCbCr                           | No Pixel transformation         | plane then line                 |
 | 1     | RGB                             | JPEG2000-RCT                    | line then plane                 |
+| 2     | BGGR (Bayer)                    | YDgCoCg-R                       | line then plane                 | 
 | Other | reserved for future use         | reserved for future use         | reserved for future use         |
 
 Restrictions: