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video-converter: keep a small backlog of lines

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Allow lines to jump backwards slightly, usefull for interlaced content.
This commit is contained in:
Wim Taymans 2014-11-19 09:30:14 +01:00
parent b911434716
commit ac756ba0d9
1 changed files with 9 additions and 5 deletions
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14
gst-libs/gst/video/video-converter.c
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@ -299,15 +299,20 @@ gst_line_cache_set_alloc_line_func (GstLineCache * cache,
cache->alloc_line_notify = notify;
}
/* keep this much backlog */
#define BACKLOG 2
static gpointer *
gst_line_cache_get_lines (GstLineCache * cache, gint out_line, gint in_line,
gint n_lines)
{
if (cache->first < in_line) {
gint to_remove = MIN (in_line - cache->first, cache->lines->len);
if (to_remove > 0)
if (cache->first + BACKLOG < in_line) {
gint to_remove =
MIN (in_line - (cache->first + BACKLOG), cache->lines->len);
if (to_remove > 0) {
g_ptr_array_remove_range (cache->lines, 0, to_remove);
cache->first = in_line;
cache->first += to_remove;
}
} else if (in_line < cache->first) {
gst_line_cache_clear (cache);
cache->first = in_line;
@ -2181,7 +2186,6 @@ video_converter_generic (GstVideoConverter * convert, const GstVideoFrame * src,
l2 = l1 + 1; \
}
static void
convert_I420_YUY2 (GstVideoConverter * convert, const GstVideoFrame * src,
GstVideoFrame * dest)