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avfilter/vf_histogram: add slide modes for thistogram

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This commit is contained in:
Paul B Mahol 2020-09-26 21:57:46 +02:00
parent a162e78cd5
commit 85195f6ae9
2 changed files with 64 additions and 1 deletions
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23
doc/filters.texi
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@ -18270,6 +18270,29 @@ Show envelope. Default is disabled.
@item ecolor, ec
Set envelope color. Default is @code{gold}.
@item slide
Set slide mode.
Available values for slide is:
@table @samp
@item frame
Draw new frame when right border is reached.
@item replace
Replace old columns with new ones.
@item scroll
Scroll from right to left.
@item rscroll
Scroll from left to right.
@item picture
Draw single picture.
@end table
Default is @code{replace}.
@end table
@section threshold

42
libavfilter/vf_histogram.c
View File

@ -34,6 +34,7 @@ typedef struct HistogramContext {
const AVClass *class; ///< AVClass context for log and options purpose
int thistogram;
int envelope;
int slide;
unsigned histogram[256*256];
int histogram_size;
int width;
@ -354,8 +355,25 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
max_hval_log = log2(max_hval + 1);
if (s->thistogram) {
const int bpp = 1 + (s->histogram_size > 256);
int minh = s->histogram_size - 1, maxh = 0;
if (s->slide == 2) {
s->x_pos = out->width - 1;
for (j = 0; j < outlink->h; j++) {
memmove(out->data[p] + j * out->linesize[p] ,
out->data[p] + j * out->linesize[p] + bpp,
(outlink->w - 1) * bpp);
}
} else if (s->slide == 3) {
s->x_pos = 0;
for (j = 0; j < outlink->h; j++) {
memmove(out->data[p] + j * out->linesize[p] + bpp,
out->data[p] + j * out->linesize[p],
(outlink->w - 1) * bpp);
}
}
for (int i = 0; i < s->histogram_size; i++) {
int idx = s->histogram_size - i - 1;
int value = s->start[p];
@ -443,8 +461,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
out->pts = in->pts;
av_frame_free(&in);
s->x_pos++;
if (s->x_pos >= s->width)
if (s->x_pos >= s->width) {
s->x_pos = 0;
if (s->thistogram && (s->slide == 4 || s->slide == 0)) {
s->out = NULL;
goto end;
}
} else if (s->thistogram && s->slide == 4) {
return 0;
}
if (s->thistogram) {
AVFrame *clone = av_frame_clone(out);
@ -453,6 +478,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
return AVERROR(ENOMEM);
return ff_filter_frame(outlink, clone);
}
end:
return ff_filter_frame(outlink, out);
}
@ -491,6 +517,13 @@ AVFilter ff_vf_histogram = {
#if CONFIG_THISTOGRAM_FILTER
static av_cold void uninit(AVFilterContext *ctx)
{
HistogramContext *s = ctx->priv;
av_frame_free(&s->out);
}
static const AVOption thistogram_options[] = {
{ "width", "set width", OFFSET(width), AV_OPT_TYPE_INT, {.i64=0}, 0, 8192, FLAGS},
{ "w", "set width", OFFSET(width), AV_OPT_TYPE_INT, {.i64=0}, 0, 8192, FLAGS},
@ -501,6 +534,12 @@ static const AVOption thistogram_options[] = {
{ "e", "display envelope", OFFSET(envelope), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "ecolor", "set envelope color", OFFSET(envelope_rgba), AV_OPT_TYPE_COLOR, {.str="gold"}, 0, 0, FLAGS },
{ "ec", "set envelope color", OFFSET(envelope_rgba), AV_OPT_TYPE_COLOR, {.str="gold"}, 0, 0, FLAGS },
{ "slide", "set slide mode", OFFSET(slide), AV_OPT_TYPE_INT, {.i64=1}, 0, 4, FLAGS, "slide" },
{"frame", "draw new frames", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "slide"},
{"replace", "replace old columns with new", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "slide"},
{"scroll", "scroll from right to left", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "slide"},
{"rscroll", "scroll from left to right", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "slide"},
{"picture", "display graph in single frame", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "slide"},
{ NULL }
};
@ -513,6 +552,7 @@ AVFilter ff_vf_thistogram = {
.query_formats = query_formats,
.inputs = inputs,
.outputs = outputs,
.uninit = uninit,
.priv_class = &thistogram_class,
};