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avformat/rmdec.c: fix left shift of negative value in rm_sync()

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Fixes ticket 8143.

Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2019-09-15 00:06:34 -03:00
parent 5a9560dfc6
commit 78f52b4fe3
1 changed files with 2 additions and 2 deletions
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libavformat/rmdec.c
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@ -724,8 +724,8 @@ static int rm_sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stre
num = avio_rb16(pb);
*timestamp = avio_rb32(pb);
mlti_id = (avio_r8(pb)>>1)-1<<16;
mlti_id = FFMAX(mlti_id, 0);
mlti_id = avio_r8((pb) >> 1) - 1;
mlti_id = FFMAX(mlti_id, 0) << 16;
*flags = avio_r8(pb); /* flags */
}
for(i=0;i<s->nb_streams;i++) {