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video-scaler: Correctly handle interlaced vertical scalers in gst_video_scaler_2d()

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We need to provide twice as many lines as usual to the scaling function
as every second lines would be skipped.

Without this we read from random memory and produce colorful output and
crashes.
This commit is contained in:
Sebastian Dröge 2019-10-21 17:28:46 +03:00
parent 255beae3ec
commit c9f132986c
1 changed files with 3 additions and 0 deletions
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gst-libs/gst/video/video-scaler.c
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@ -1491,6 +1491,9 @@ gst_video_scaler_2d (GstVideoScaler * hscale, GstVideoScaler * vscale,
realloc_tmplines (vscale, n_elems, width); realloc_tmplines (vscale, n_elems, width);
v_taps = vscale->resampler.max_taps; v_taps = vscale->resampler.max_taps;
if (vscale->flags & GST_VIDEO_SCALER_FLAG_INTERLACED)
v_taps *= 2;
lines = g_alloca (v_taps * sizeof (gpointer)); lines = g_alloca (v_taps * sizeof (gpointer));
if (hscale == NULL) { if (hscale == NULL) {