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From: llyyr <llyyr.public@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Cc: llyyr <llyyr.public@gmail.com>
Subject: [FFmpeg-devel] [PATCH v2 1/2] hevc_ps: fix cpb_cnt_minus1 initialization
Date: Sun, 10 Sep 2023 20:55:22 +0530
Message-ID: <20230910152522.27429-2-llyyr.public@gmail.com> (raw)

Fixes: fc429d785e9e24c5520ce716d4bc3b5547e581eb

cpb_cnt used to be initialized to 1 before
fc429d785e9e24c5520ce716d4bc3b5547e581eb so cpb_cnt_minus1 should be
initialized to 0.

Also add +1 to the decode_sublayer_hrd call to account for the change to
the offset
---
 libavcodec/hevc_ps.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index bdd623507d..ac3fe55b07 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -406,8 +406,6 @@ static int decode_hrd(GetBitContext *gb, int common_inf_present,
     for (int i = 0; i < max_sublayers; i++) {
         hdr->flags.fixed_pic_rate_general_flag = get_bits1(gb);
 
-        hdr->cpb_cnt_minus1[i] = 1;
-
         if (!hdr->flags.fixed_pic_rate_general_flag)
             hdr->flags.fixed_pic_rate_within_cvs_flag = get_bits1(gb);
 
@@ -426,11 +424,11 @@ static int decode_hrd(GetBitContext *gb, int common_inf_present,
         }
 
         if (hdr->flags.nal_hrd_parameters_present_flag)
-            decode_sublayer_hrd(gb, hdr->cpb_cnt_minus1[i], &hdr->nal_params[i],
+            decode_sublayer_hrd(gb, hdr->cpb_cnt_minus1[i]+1, &hdr->nal_params[i],
                                 hdr->flags.sub_pic_hrd_params_present_flag);
 
         if (hdr->flags.vcl_hrd_parameters_present_flag)
-            decode_sublayer_hrd(gb, hdr->cpb_cnt_minus1[i], &hdr->vcl_params[i],
+            decode_sublayer_hrd(gb, hdr->cpb_cnt_minus1[i]+1, &hdr->vcl_params[i],
                                 hdr->flags.sub_pic_hrd_params_present_flag);
     }
 
-- 
2.42.0

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             reply	other threads:[~2023-09-10 15:26 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-10 15:25 llyyr [this message]
2023-09-10 15:25 ` [FFmpeg-devel] [PATCH v2 2/2] hevc_ps: fix fixed_rate check llyyr
2023-09-10 15:32   ` Lynne
2023-09-10 19:06     ` Derek Buitenhuis

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