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Implement robust parsing in aspect filters.

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Originally committed as revision 25802 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-11-22 22:03:30 +00:00
parent eee0ef5e4f
commit 7de19a3264
1 changed files with 11 additions and 9 deletions
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12
libavfilter/vf_aspect.c
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@ -34,23 +34,25 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
AspectContext *aspect = ctx->priv;
double ratio;
int64_t gcd;
char c = 0;
if (args) {
if (sscanf(args, "%d:%d", &aspect->aspect.num, &aspect->aspect.den) < 2) {
if (sscanf(args, "%lf", &ratio) < 1) {
if (sscanf(args, "%d:%d%c", &aspect->aspect.num, &aspect->aspect.den, &c) != 2)
if (sscanf(args, "%lf%c", &ratio, &c) == 1)
aspect->aspect = av_d2q(ratio, 100);
if (c || aspect->aspect.num <= 0 || aspect->aspect.den <= 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid string '%s' for aspect ratio.\n", args);
return AVERROR(EINVAL);
}
aspect->aspect = av_d2q(ratio, 100);
} else {
gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
if (gcd) {
aspect->aspect.num /= gcd;
aspect->aspect.den /= gcd;
}
}
}
if (aspect->aspect.den == 0)
aspect->aspect = (AVRational) {0, 1};