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avfilter/palettegen: allow a minimum of 2 colors

This commit is contained in:
Clément Bœsch 2022-12-27 22:06:23 +01:00
parent c94988a781
commit cad9d7fc85
1 changed files with 6 additions and 1 deletions
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7
libavfilter/vf_palettegen.c
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@ -82,7 +82,7 @@ typedef struct PaletteGenContext {
#define OFFSET(x) offsetof(PaletteGenContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption palettegen_options[] = {
{ "max_colors", "set the maximum number of colors to use in the palette", OFFSET(max_colors), AV_OPT_TYPE_INT, {.i64=256}, 4, 256, FLAGS },
{ "max_colors", "set the maximum number of colors to use in the palette", OFFSET(max_colors), AV_OPT_TYPE_INT, {.i64=256}, 2, 256, FLAGS },
{ "reserve_transparent", "reserve a palette entry for transparency", OFFSET(reserve_transparent), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "transparency_color", "set a background color for transparency", OFFSET(transparency_color), AV_OPT_TYPE_COLOR, {.str="lime"}, 0, 0, FLAGS },
{ "stats_mode", "set statistics mode", OFFSET(stats_mode), AV_OPT_TYPE_INT, {.i64=STATS_MODE_ALL_FRAMES}, 0, NB_STATS_MODE-1, FLAGS, "mode" },
@ -586,6 +586,11 @@ static int init(AVFilterContext *ctx)
if (s->use_alpha && s->reserve_transparent)
s->reserve_transparent = 0;
if (s->max_colors - s->reserve_transparent < 2) {
av_log(ctx, AV_LOG_ERROR, "max_colors=2 is only allowed without reserving a transparent color slot\n");
return AVERROR(EINVAL);
}
return 0;
}