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v4l2transform: fix scaling in case of fixed pixel aspect ratio

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To change pixel aspect ratio from DAR to PAR, the necessary scaling factor
is DAR/PAR, not DAR*PAR.
For good measure, add debug output similar to the fixed-width and
fixed-height cases.

https://bugzilla.gnome.org/show_bug.cgi?id=766711
This commit is contained in:
Philipp Zabel 2016-05-20 12:32:25 +02:00 committed by Nicolas Dufresne
parent 616ccbb0db
commit 89a2f0a647
1 changed files with 4 additions and 2 deletions
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6
sys/v4l2/gstv4l2transform.c
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@ -687,9 +687,11 @@ gst_v4l2_transform_fixate_caps (GstBaseTransform * trans,
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d);
/* Calculate scale factor for the PAR change */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_n,
to_par_d, &num, &den)) {
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
to_par_n, &num, &den)) {
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;