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video-resampler: Fix lanczos parameters for variable taps

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when using variable taps and when we are limiting the number of taps,
recalculate the lanczos parameters to match the clamped value.
Set the max number of taps to 128
This commit is contained in:
Wim Taymans 2014-11-25 09:11:31 +01:00
parent e5c6f59140
commit 721bbcad34
1 changed files with 17 additions and 13 deletions
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30
gst-libs/gst/video/video-resampler.c
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@ -35,7 +35,7 @@
#define DEFAULT_OPT_SHARPNESS 1.0
#define DEFAULT_OPT_SHARPEN 0.0
#define DEFAULT_OPT_MAX_TAPS 16
#define DEFAULT_OPT_MAX_TAPS 128
typedef struct _ResamplerParams ResamplerParams;
@ -354,6 +354,7 @@ gst_video_resampler_init (GstVideoResampler * resampler,
GST_DEBUG ("%d %u %u->%u", method, n_taps, in_size, out_size);
max_taps = GET_OPT_MAX_TAPS (options);
n_taps = CLAMP (n_taps, 0, max_taps);
switch (method) {
case GST_VIDEO_RESAMPLER_METHOD_NEAREST:
@ -379,22 +380,27 @@ gst_video_resampler_init (GstVideoResampler * resampler,
break;
case GST_VIDEO_RESAMPLER_METHOD_LANCZOS:
{
gdouble resample_inc = in_size / (gdouble) out_size;
params.envelope = GET_OPT_ENVELOPE (options);
params.sharpness = GET_OPT_SHARPNESS (options);
params.sharpen = GET_OPT_SHARPEN (options);
if (resample_inc > 1.0) {
params.fx = (1.0 / resample_inc) * params.sharpness;
} else {
params.fx = (1.0) * params.sharpness;
}
params.ex = params.fx / params.envelope;
params.dx = ceil (params.envelope / params.fx);
if (n_taps == 0) {
gdouble resample_inc = in_size / (gdouble) out_size;
if (resample_inc > 1.0) {
params.fx = (1.0 / resample_inc) * params.sharpness;
} else {
params.fx = (1.0) * params.sharpness;
}
params.ex = params.fx / params.envelope;
params.dx = ceil (params.envelope / params.fx);
n_taps = CLAMP (2 * params.dx, 0, max_taps);
}
params.fx = 2.0 * params.envelope / n_taps;
params.ex = 2.0 / n_taps;
if (n_taps == 0)
n_taps = 2 * params.dx;
params.get_tap = get_lanczos_tap;
break;
}
@ -402,8 +408,6 @@ gst_video_resampler_init (GstVideoResampler * resampler,
break;
}
n_taps = CLAMP (n_taps, 0, max_taps);
if (n_taps > in_size)
n_taps = in_size;