[FFmpeg-cvslog] avcodec/ffv1: RCT is only possible with RGB

[Michael Niedermayer]

ffmpeg | branch: release/7.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Oct  3 01:49:09 2024 +0200| [7043ef6828548c64b8e75baa1f6d9ce6fa052a72] | committer: Michael Niedermayer

avcodec/ffv1: RCT is only possible with RGB

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 2542e9296c76524494a2d17a4423d756560b5273)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7043ef6828548c64b8e75baa1f6d9ce6fa052a72
---

 libavcodec/ffv1dec.c | 2 +-
 libavcodec/ffv1enc.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 44b2085f78..79374658ec 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -241,7 +241,7 @@ static int decode_slice_header(const FFV1Context *f,
     if (f->version > 3) {
         sc->slice_reset_contexts = get_rac(c, state);
         sc->slice_coding_mode = get_symbol(c, state, 0);
-        if (sc->slice_coding_mode != 1) {
+        if (sc->slice_coding_mode != 1 && f->colorspace == 1) {
             sc->slice_rct_by_coef = get_symbol(c, state, 0);
             sc->slice_rct_ry_coef = get_symbol(c, state, 0);
             if ((uint64_t)sc->slice_rct_by_coef + (uint64_t)sc->slice_rct_ry_coef > 4) {
diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
index 3e8f6ee445..8e436358ed 100644
--- a/libavcodec/ffv1enc.c
+++ b/libavcodec/ffv1enc.c
@@ -946,7 +946,7 @@ static void encode_slice_header(FFV1Context *f, FFV1SliceContext *sc)
         if (sc->slice_coding_mode == 1)
             ff_ffv1_clear_slice_state(f, sc);
         put_symbol(c, state, sc->slice_coding_mode, 0);
-        if (sc->slice_coding_mode != 1) {
+        if (sc->slice_coding_mode != 1 && f->colorspace == 1) {
             put_symbol(c, state, sc->slice_rct_by_coef, 0);
             put_symbol(c, state, sc->slice_rct_ry_coef, 0);
         }
@@ -1062,7 +1062,7 @@ static int encode_slice(AVCodecContext *c, void *arg)
                                 p->data[3] ? p->data[3] + ps*x + y*p->linesize[3] : NULL};
 
     sc->slice_coding_mode = 0;
-    if (f->version > 3) {
+    if (f->version > 3 && f->colorspace == 1) {
         choose_rct_params(f, sc, planes, p->linesize, width, height);
     } else {
         sc->slice_rct_by_coef = 1;