mirror of https://git.ffmpeg.org/ffmpeg.git
avfilter/vf_tile: add init_padding option
Signed-off-by: Paul B Mahol <onemda@gmail.com>
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@ -14637,6 +14637,11 @@ is "black".
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@item overlap
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Set the number of frames to overlap when tiling several successive frames together.
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The value must be between @code{0} and @var{nb_frames - 1}.
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@item init_padding
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Set the number of frames to initially be empty before displaying first output frame.
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This controls how soon will one get first output frame.
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The value must be between @code{0} and @var{nb_frames - 1}.
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@end table
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@subsection Examples
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@ -38,6 +38,7 @@ typedef struct TileContext {
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unsigned margin;
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unsigned padding;
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unsigned overlap;
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unsigned init_padding;
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unsigned current;
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unsigned nb_frames;
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FFDrawContext draw;
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@ -62,6 +63,8 @@ static const AVOption tile_options[] = {
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{ "color", "set the color of the unused area", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
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{ "overlap", "set how many frames to overlap for each render", OFFSET(overlap),
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AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
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{ "init_padding", " set how many frames to initially pad", OFFSET(init_padding),
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AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
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{ NULL }
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};
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@ -99,6 +102,12 @@ static av_cold int init(AVFilterContext *ctx)
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tile->overlap = tile->nb_frames - 1;
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}
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if (tile->init_padding >= tile->nb_frames) {
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av_log(ctx, AV_LOG_WARNING, "init_padding must be less than %d\n", tile->nb_frames);
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} else {
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tile->current = tile->init_padding;
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}
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return 0;
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}
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@ -201,11 +210,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
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tile->out_ref->height = outlink->h;
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/* fill surface once for margin/padding */
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if (tile->margin || tile->padding)
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if (tile->margin || tile->padding || tile->init_padding)
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ff_fill_rectangle(&tile->draw, &tile->blank,
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tile->out_ref->data,
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tile->out_ref->linesize,
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0, 0, outlink->w, outlink->h);
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tile->init_padding = 0;
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}
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if (tile->prev_out_ref) {
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