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video-converter: only enable backlog for interlaced video

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Skip lines we don't need.
This commit is contained in:
Wim Taymans 2015-02-10 11:15:22 +01:00
parent c15dfc30e5
commit 622fa74a07
1 changed files with 12 additions and 6 deletions
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18
gst-libs/gst/video/video-converter.c
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@ -271,6 +271,7 @@ typedef gboolean (*GstLineCacheNeedLineFunc) (GstLineCache * cache,
struct _GstLineCache
{
gint first;
gint backlog;
GPtrArray *lines;
GstLineCache *prev;
@ -342,20 +343,22 @@ gst_line_cache_set_alloc_line_func (GstLineCache * cache,
cache->alloc_line_notify = notify;
}
/* keep this much backlog */
/* keep this much backlog for interlaced video */
#define BACKLOG 2
static gpointer *
gst_line_cache_get_lines (GstLineCache * cache, gint out_line, gint in_line,
gint n_lines)
{
if (cache->first + BACKLOG < in_line) {
if (cache->first + cache->backlog < in_line) {
gint to_remove =
MIN (in_line - (cache->first + BACKLOG), cache->lines->len);
MIN (in_line - (cache->first + cache->backlog), cache->lines->len);
if (to_remove > 0) {
g_ptr_array_remove_range (cache->lines, 0, to_remove);
cache->first += to_remove;
}
cache->first += to_remove;
if (cache->first < in_line)
cache->first = in_line;
} else if (in_line < cache->first) {
gst_line_cache_clear (cache);
cache->first = in_line;
@ -1260,6 +1263,7 @@ chain_vscale (GstVideoConverter * convert, GstLineCache * prev)
{
gint method;
guint taps, taps_i = 0;
gint backlog = 0;
method = GET_OPT_RESAMPLER_METHOD (convert);
taps = GET_OPT_RESAMPLER_TAPS (convert);
@ -1270,6 +1274,7 @@ chain_vscale (GstVideoConverter * convert, GstLineCache * prev)
taps, convert->in_height, convert->out_height, convert->config);
gst_video_scaler_get_coeff (convert->v_scaler_i, 0, NULL, &taps_i);
backlog = BACKLOG;
}
convert->v_scaler_p =
gst_video_scaler_new (method, 0, taps, convert->in_height,
@ -1280,9 +1285,10 @@ chain_vscale (GstVideoConverter * convert, GstLineCache * prev)
gst_video_scaler_get_coeff (convert->v_scaler_p, 0, NULL, &taps);
GST_DEBUG ("chain vscale %d->%d, taps %d, method %d",
convert->in_height, convert->out_height, taps, method);
GST_DEBUG ("chain vscale %d->%d, taps %d, method %d, backlog %d",
convert->in_height, convert->out_height, taps, method, backlog);
prev->backlog = backlog;
prev = convert->vscale_lines = gst_line_cache_new (prev);
prev->pass_alloc = (taps == 1);
prev->write_input = FALSE;