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video/converter: increase the number of cache lines for resampling

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The exising hardcoded max default does not account for the possible
-1 offset when retrieving lines for resampling.  As a result, when
another chain has the same number of cache lines (4), the resample
operation would be attempting to generate 5 lines with a cache size
of 4 and would overwrite the first cache line.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/821

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/938>
This commit is contained in:
Matthew Waters 2020-11-20 16:51:09 +11:00 committed by GStreamer Merge Bot
parent 831199a808
commit d4ff62700d
1 changed files with 4 additions and 2 deletions
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6
gst-libs/gst/video/video-converter.c
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@ -851,7 +851,8 @@ chain_upsample (GstVideoConverter * convert, GstLineCache * prev, gint idx)
prev = convert->upsample_lines[idx] = gst_line_cache_new (prev);
prev->write_input = TRUE;
prev->pass_alloc = TRUE;
prev->n_lines = 4;
/* XXX: why this hardcoded value? */
prev->n_lines = 5;
prev->stride = convert->current_pstride * convert->current_width;
gst_line_cache_set_need_line_func (prev,
do_upsample_lines, idx, convert, NULL);
@ -1959,7 +1960,8 @@ chain_downsample (GstVideoConverter * convert, GstLineCache * prev, gint idx)
prev = convert->downsample_lines[idx] = gst_line_cache_new (prev);
prev->write_input = TRUE;
prev->pass_alloc = TRUE;
prev->n_lines = 4;
/* XXX: why this hardcoded value? */
prev->n_lines = 5;
prev->stride = convert->current_pstride * convert->current_width;
gst_line_cache_set_need_line_func (prev,
do_downsample_lines, idx, convert, NULL);