[FFmpeg-devel] [PATCH] avcodec/h2645_vui: Interpret a degenerate SAR as unspecified.

[Giovanni Mascellani via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

[-- Attachment #1.1.1: Type: text/plain, Size: 1100 bytes --]

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 0e576c1563..7d01354761 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);
-- 
2.51.0


[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

[-- Attachment #2: Type: text/plain, Size: 163 bytes --]

_______________________________________________
ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org
To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org