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libavcodec/webp: treat out-of-bound palette index as translucent black

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See https://code.google.com/p/webp/issues/detail?id=206
for a description of the problem/fix.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This patch makes the decoder follow the recommendation of the spec.
There is some disagreement (see "[FFmpeg-devel] [PATCH]: libavcodec/webp")
about what would be best to be written in the spec, so in case the spec
is changed again, this potentially would need to be amended or reverted
This commit is contained in:
Pascal Massimino 2014-09-16 17:01:07 +02:00 committed by Michael Niedermayer
parent 59af5383c1
commit 4fd21d58a7
1 changed files with 5 additions and 5 deletions
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10
libavcodec/webp.c
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@ -1028,7 +1028,7 @@ static int apply_color_indexing_transform(WebPContext *s)
ImageContext *img;
ImageContext *pal;
int i, x, y;
uint8_t *p, *pi;
uint8_t *p;
img = &s->image[IMAGE_ROLE_ARGB];
pal = &s->image[IMAGE_ROLE_COLOR_INDEXING];
@ -1066,11 +1066,11 @@ static int apply_color_indexing_transform(WebPContext *s)
p = GET_PIXEL(img->frame, x, y);
i = p[2];
if (i >= pal->frame->width) {
av_log(s->avctx, AV_LOG_ERROR, "invalid palette index %d\n", i);
return AVERROR_INVALIDDATA;
AV_WB32(p, 0xFF000000);
} else {
const uint8_t *pi = GET_PIXEL(pal->frame, i, 0);
AV_COPY32(p, pi);
}
pi = GET_PIXEL(pal->frame, i, 0);
AV_COPY32(p, pi);
}
}