On Thu, Jul 20, 2017 at 05:42:51PM +0200, Nicolas George wrote:
[...]
> diff --git a/libavfilter/vsrc_testsrc.c b/libavfilter/vsrc_testsrc.c
> index c4a5ae3742..f94c3ed9dd 100644
> --- a/libavfilter/vsrc_testsrc.c
> +++ b/libavfilter/vsrc_testsrc.c
> @@ -66,6 +66,9 @@ typedef struct TestSourceContext {
> /* only used by testsrc */
> int nb_decimals;
>
> + /* only used by testsrc2 */
> + int alpha;
> +
> /* only used by color */
> FFDrawContext draw;
> FFDrawColor color;
> @@ -685,6 +688,7 @@ AVFilter ff_vsrc_testsrc = {
>
> static const AVOption testsrc2_options[] = {
> COMMON_OPTIONS
> + { "alpha", "set global alpha (opacity)", OFFSET(alpha), AV_OPT_TYPE_INT,
> {.i64 = 255}, 0, 255, FLAGS },
> { NULL }
> };
>
> @@ -735,6 +739,7 @@ static void test2_fill_picture(AVFilterContext *ctx,
> AVFrame *frame)
> {
> TestSourceContext *s = ctx->priv;
> FFDrawColor color;
> + unsigned alpha = s->alpha << 24;small note here: i think x<<24 is undefined for x=0xff if x is signed -- Clément B.
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