lavc: Move context_model to codec private options

This option is only used by ffv1 and ffvhuff.
It is a very codec-specific option, so deprecate the global variant.
Improve documentation a little.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/libavcodec/ffv1.h b/libavcodec/ffv1.h
index b44253e94c..34370fa143 100644
--- a/libavcodec/ffv1.h
+++ b/libavcodec/ffv1.h
@@ -103,6 +103,7 @@ typedef struct FFV1Context {
     int ec;
     int slice_damaged;
     int key_frame_ok;
+    int context_model;
 
     int bits_per_raw_sample;
     int packed_at_lsb;