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From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Date: Mon, 24 Mar 2025 18:39:38 +0100
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Subject: [FFmpeg-devel] [PATCH 04/11] avcodec/ffv1enc: remap table size is
1<<bits_per_raw_sample not fixed 65536
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not a bugfix as this path was only used for float16 but it makes sense
to allow using this for integers too
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/ffv1enc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
index 05b43c12abf..78a9a903039 100644
--- a/libavcodec/ffv1enc.c
+++ b/libavcodec/ffv1enc.c
@@ -1168,6 +1168,7 @@ static void choose_rct_params(const FFV1Context *f, FFV1SliceContext *sc,
static void encode_histogram_remap(FFV1Context *f, FFV1SliceContext *sc)
{
+ int len = 1 << f->bits_per_raw_sample;
int flip = sc->remap == 2 ? 0x7FFF : 0;
for (int p= 0; p < 1 + 2*f->chroma_planes + f->transparency; p++) {
@@ -1179,7 +1180,7 @@ static void encode_histogram_remap(FFV1Context *f, FFV1SliceContext *sc)
memset(state, 128, sizeof(state));
put_symbol(&sc->c, state[0], 0, 0);
memset(state, 128, sizeof(state));
- for (int i= 0; i<65536; i++) {
+ for (int i= 0; i<len; i++) {
int ri = i ^ ((i&0x8000) ? 0 : flip);
int u = sc->fltmap[p][ri];
sc->fltmap[p][ri] = j;
--
2.48.1
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