From: Giovanni Mascellani <gmascellani@codeweavers.com>
To: ffmpeg-devel@ffmpeg.org
Cc: Giovanni Mascellani <gmascellani@codeweavers.com>
Subject: [FFmpeg-devel] [PATCH v2] avcodec/h2645_vui: Interpret a degenerate SAR as unspecified.
Date: Wed, 31 Jul 2024 11:45:13 +0200
Message-ID: <20240731094513.411877-1-gmascellani@codeweavers.com> (raw)
The specification says that if either the numerator or the
denominator is zero then the SAR is to be intended unspecified.
Internally ffmpeg represents an unspecified SAR as 0/1, while
fractions with a zero denominator are not handled properly;
so we bridge the gap by replacing x/0 with 0/1.
Signed-off-by: Giovanni Mascellani <gmascellani@codeweavers.com>
---
libavcodec/h2645_vui.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/h2645_vui.c b/libavcodec/h2645_vui.c
index e5c7bf46f9..c8df733399 100644
--- a/libavcodec/h2645_vui.c
+++ b/libavcodec/h2645_vui.c
@@ -46,6 +46,8 @@ void ff_h2645_decode_common_vui_params(GetBitContext *gb, H2645VUI *vui, void *l
else if (vui->aspect_ratio_idc == EXTENDED_SAR) {
vui->sar.num = get_bits(gb, 16);
vui->sar.den = get_bits(gb, 16);
+ if (vui->sar.den == 0)
+ vui->sar = (AVRational){ 0, 1 };
} else
av_log(logctx, AV_LOG_WARNING,
"Unknown SAR index: %u.\n", vui->aspect_ratio_idc);
--
2.45.2
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