PR #25786 opened by kierank URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25786 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25786.patch
rem6[] and div6[] are sized for qP up to 51 + 4 * 6 = 75 (QpY + QpBdOffset at 12 bits) but list only 74 values, so qP 74 and 75 read the zero padding: 12-bit coefficients at QP 50 and 51 are scaled by levelScale[0] << 0 = 40 instead of 51 << 12 and 57 << 12. Add the two missing entries. Written by AI # Summary of changes Briefly describe what this PR does and why. <!-- If this PR requires new FATE test samples, attach them to the PR and list their target paths below (relative to the fate-suite root). Attached filenames must match the sample's filename: ```fate-samples # e.g. vorbis/new-sample.ogg ``` --> >From f530b3ff1027f67a912655000f0c6d44898ba19e Mon Sep 17 00:00:00 2001 From: Kieran Kunhya <[email protected]> Date: Thu, 5 Nov 2026 08:50:27 +0100 Subject: [PATCH] avcodec/hevc/cabac: complete the dequantisation tables for 12-bit QP 50 and 51 rem6[] and div6[] are sized for qP up to 51 + 4 * 6 = 75 (QpY + QpBdOffset at 12 bits) but list only 74 values, so qP 74 and 75 read the zero padding: 12-bit coefficients at QP 50 and 51 are scaled by levelScale[0] << 0 = 40 instead of 51 << 12 and 57 << 12. Add the two missing entries. --- libavcodec/hevc/cabac.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/hevc/cabac.c b/libavcodec/hevc/cabac.c index 57f43be06f3..74dbcc720c6 100644 --- a/libavcodec/hevc/cabac.c +++ b/libavcodec/hevc/cabac.c @@ -1110,14 +1110,14 @@ void ff_hevc_hls_residual_coding(HEVCLocalContext *lc, const HEVCPPS *pps, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, - 4, 5, 0, 1, 2, 3, 4, 5, 0, 1 + 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3 }; static const uint8_t div6[51 + 4 * 6 + 1] = { 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, - 10, 10, 11, 11, 11, 11, 11, 11, 12, 12 + 10, 10, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12 }; int qp_y = lc->qp_y; -- 2.54.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
