int offset = tag == TIFF_YRES ? 2 : 0;
s->res[offset++] = num;
s->res[offset] = den;
- if (s->res[0] && s->res[1] && s->res[2] && s->res[3])
+ if (s->res[0] && s->res[1] && s->res[2] && s->res[3]) {
+ uint64_t num = s->res[2] * (uint64_t)s->res[1];
+ uint64_t den = s->res[0] * (uint64_t)s->res[3];
+ if (num > INT64_MAX || den > INT64_MAX) {
+ num = num >> 1;
+ den = den >> 1;
+ }
av_reduce(&s->avctx->sample_aspect_ratio.num, &s->avctx->sample_aspect_ratio.den,
- s->res[2] * (uint64_t)s->res[1], s->res[0] * (uint64_t)s->res[3], INT32_MAX);
+ num, den, INT32_MAX);
+ if (!s->avctx->sample_aspect_ratio.den)
+ s->avctx->sample_aspect_ratio = (AVRational) {0, 1};
+ }
}
static int tiff_decode_tag(TiffContext *s, AVFrame *frame)