diff mbox series

[FFmpeg-devel] avfilter/vf_zscale: add support for setting scaling filter parameters

Message ID 20210209210754.7618-1-jeebjp@gmail.com
State Superseded
Headers show
Series [FFmpeg-devel] avfilter/vf_zscale: add support for setting scaling filter parameters | expand

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Commit Message

Jan Ekström Feb. 9, 2021, 9:07 p.m. UTC 
param_a/b are utilized for this.
---
 libavfilter/vf_zscale.c | 7 +++++++
 1 file changed, 7 insertions(+)

Comments

Paul B Mahol Feb. 9, 2021, 9:22 p.m. UTC | #1 
LGTM, please update documentation too.
diff mbox series

Patch

diff --git a/libavfilter/vf_zscale.c b/libavfilter/vf_zscale.c
index 57199a0878..c195cf0591 100644
--- a/libavfilter/vf_zscale.c
+++ b/libavfilter/vf_zscale.c
@@ -101,6 +101,8 @@  typedef struct ZScaleContext {
     char *size_str;
     double nominal_peak_luminance;
     int approximate_gamma;
+    double param_a;
+    double param_b;
 
     char *w_expr;               ///< width  expression string
     char *h_expr;               ///< height expression string
@@ -601,6 +603,8 @@  static int filter_frame(AVFilterLink *link, AVFrame *in)
         s->params.resample_filter_uv = s->filter;
         s->params.nominal_peak_luminance = s->nominal_peak_luminance;
         s->params.allow_approximate_gamma = s->approximate_gamma;
+        s->params.filter_param_a = s->params.filter_param_a_uv = s->param_a;
+        s->params.filter_param_b = s->params.filter_param_b_uv = s->param_b;
 
         format_init(&s->src_format, in, desc, s->colorspace_in,
                     s->primaries_in, s->trc_in, s->range_in, s->chromal_in);
@@ -897,6 +901,9 @@  static const AVOption zscale_options[] = {
     { "cin",        "set input chroma location", OFFSET(chromal_in), AV_OPT_TYPE_INT, {.i64 = -1}, -1, ZIMG_CHROMA_BOTTOM, FLAGS, "chroma" },
     { "npl",       "set nominal peak luminance", OFFSET(nominal_peak_luminance), AV_OPT_TYPE_DOUBLE, {.dbl = NAN}, 0, DBL_MAX, FLAGS },
     { "agamma",       "allow approximate gamma", OFFSET(approximate_gamma),      AV_OPT_TYPE_BOOL,   {.i64 = 1},   0, 1,       FLAGS },
+    { "param_a", "parameter A, which is parameter \"b\" for bicubic, "
+                 "and the number of filter taps for lanczos", OFFSET(param_a), AV_OPT_TYPE_DOUBLE, {.dbl = NAN}, 0, DBL_MAX, FLAGS },
+    { "param_b", "parameter B, which is parameter \"c\" for bicubic", OFFSET(param_b), AV_OPT_TYPE_DOUBLE, {.dbl = NAN}, 0, DBL_MAX, FLAGS },
     { NULL }
 };