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avcodec/dvbsubenc: fix 256 color rle decoding

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The end of 8-bit/pixel_code_string() is signalled with two zero bytes, so we
should read those from the buffer instead of one. We keep supporting though our
own buggy encoder which only put one zero byte there.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2025-08-03 01:12:20 +02:00
parent aeb6ea51f5
commit d5f7a428b1
1 changed files with 4 additions and 0 deletions
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4
libavcodec/dvbsubdec.c
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@ -660,6 +660,10 @@ static int dvbsub_read_8bit_string(AVCodecContext *avctx,
if (bytestream2_get_byte(gb)) if (bytestream2_get_byte(gb))
av_log(avctx, AV_LOG_ERROR, "line overflow\n"); av_log(avctx, AV_LOG_ERROR, "line overflow\n");
/* Workaround our own buggy encoder which only put one zero at the end */
if (!bytestream2_peek_byte(gb))
bytestream2_get_byte(gb);
*srcbuf += bytestream2_tell(gb); *srcbuf += bytestream2_tell(gb);
return pixels_read; return pixels_read;
} }