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avfilter/vf_fftfilt: make it possible to evaluate expressions per frame

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-09-04 19:29:37 +02:00
parent 4705a80fb0
commit b43cd67862
2 changed files with 55 additions and 17 deletions
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17
doc/filters.texi
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@ -7926,6 +7926,20 @@ Set the frequency domain weight expression for the 1st chroma plane.
@item weight_V
Set the frequency domain weight expression for the 2nd chroma plane.
@item eval
Set when the expressions are evaluated.
It accepts the following values:
@table @samp
@item init
Only evaluate expressions once during the filter initialization.
@item frame
Evaluate expressions for each incoming frame.
@end table
Default value is @samp{init}.
The filter accepts the following variables:
@item X
@item Y
@ -7934,6 +7948,9 @@ The coordinates of the current sample.
@item W
@item H
The width and height of the image.
@item N
The number of input frame, starting from 0.
@end table
@subsection Examples

55
libavfilter/vf_fftfilt.c
View File

@ -33,9 +33,16 @@
#define MAX_PLANES 4
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
typedef struct FFTFILTContext {
const AVClass *class;
int eval_mode;
int depth;
int nb_planes;
int planewidth[MAX_PLANES];
@ -59,8 +66,8 @@ typedef struct FFTFILTContext {
} FFTFILTContext;
static const char *const var_names[] = { "X", "Y", "W", "H", NULL };
enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_VARS_NB };
static const char *const var_names[] = { "X", "Y", "W", "H", "N", NULL };
enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_VARS_NB };
enum { Y = 0, U, V };
@ -74,6 +81,9 @@ static const AVOption fftfilt_options[] = {
{ "weight_Y", "set luminance expression in Y plane", OFFSET(weight_str[Y]), AV_OPT_TYPE_STRING, {.str = "1"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "weight_U", "set chrominance expression in U plane", OFFSET(weight_str[U]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "weight_V", "set chrominance expression in V plane", OFFSET(weight_str[V]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{NULL},
};
@ -195,12 +205,30 @@ static av_cold int initialize(AVFilterContext *ctx)
return ret;
}
static void do_eval(FFTFILTContext *s, AVFilterLink *inlink, int plane)
{
double values[VAR_VARS_NB];
int i, j;
values[VAR_N] = inlink->frame_count_out;
values[VAR_W] = s->planewidth[plane];
values[VAR_H] = s->planeheight[plane];
for (i = 0; i < s->rdft_hlen[plane]; i++) {
values[VAR_X] = i;
for (j = 0; j < s->rdft_vlen[plane]; j++) {
values[VAR_Y] = j;
s->weight[plane][i * s->rdft_vlen[plane] + j] =
av_expr_eval(s->weight_expr[plane], values, s);
}
}
}
static int config_props(AVFilterLink *inlink)
{
FFTFILTContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc;
int rdft_hbits, rdft_vbits, i, j, plane;
double values[VAR_VARS_NB];
int rdft_hbits, rdft_vbits, i, plane;
desc = av_pix_fmt_desc_get(inlink->format);
s->depth = desc->comp[0].depth;
@ -242,21 +270,11 @@ static int config_props(AVFilterLink *inlink)
/*Luminance value - Array initialization*/
for (plane = 0; plane < 3; plane++) {
values[VAR_W] = s->planewidth[plane];
values[VAR_H] = s->planeheight[plane];
if(!(s->weight[plane] = av_malloc_array(s->rdft_hlen[plane], s->rdft_vlen[plane] * sizeof(double))))
return AVERROR(ENOMEM);
for (i = 0; i < s->rdft_hlen[plane]; i++)
{
values[VAR_X] = i;
for (j = 0; j < s->rdft_vlen[plane]; j++)
{
values[VAR_Y] = j;
s->weight[plane][i * s->rdft_vlen[plane] + j] =
av_expr_eval(s->weight_expr[plane], values, s);
}
}
if (s->eval_mode == EVAL_MODE_INIT)
do_eval(s, inlink, plane);
}
return 0;
}
@ -281,6 +299,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
int w = s->planewidth[plane];
int h = s->planeheight[plane];
if (s->eval_mode == EVAL_MODE_FRAME)
do_eval(s, inlink, plane);
rdft_horizontal(s, in, w, h, plane);
rdft_vertical(s, h, plane);