lavc/tiff: Decode embedded JPEGs in DNG images

Used a technique similar to lavc/tdsc.c for invoking the MJPEG decoder.

This commit adds support for:
- DNG tiles
- DNG tile huffman lossless JPEG decoding
- DNG 8-bpp ("packed" as dcraw calls it) decoding
- DNG color scaling [1]
  - LinearizationTable tag
  - BlackLevel tag

[1]: As specified in the DNG Specification - Chapter 5

Signed-off-by: Nick Renieris <velocityra@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/libavcodec/tiff.h b/libavcodec/tiff.h
index 81913c6b1a..2184c2c829 100644
--- a/libavcodec/tiff.h
+++ b/libavcodec/tiff.h
@@ -101,6 +101,8 @@ enum TiffTags {
 enum DngTags {
     DNG_VERSION             = 0xC612,
     DNG_BACKWARD_VERSION    = 0xC613,
+    DNG_LINEARIZATION_TABLE = 0xC618,
+    DNG_BLACK_LEVEL         = 0xC61A,
     DNG_WHITE_LEVEL         = 0xC61D,
 };