From: Niklas Haas <g...@haasn.dev>
Chooses the desired output alpha mode. Note that this depends on
an upstream version of libplacebo new enough to respect the corresponding
AVFrame field in pl_map_avframe_ex.
---
doc/filters.texi | 4 ++++
libavfilter/vf_libplacebo.c | 13 +++++++++++++
2 files changed, 17 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 13ca065f85..d4566cb594 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -16380,6 +16380,10 @@ leading to no change. For any other value, conversion
will be performed.
See the @ref{setparams} filter for a list of possible values.
+@item alpha_mode
+Choose the desired output alpha mode, when the output format has an alpha
+channel. See the @ref{setparams} filter for a list of possible values.
+
@item apply_filmgrain
Apply film grain (e.g. AV1 or H.274) if present in source frames, and strip
it from the output. Enabled by default.
diff --git a/libavfilter/vf_libplacebo.c b/libavfilter/vf_libplacebo.c
index 475030c80d..bb73350da5 100644
--- a/libavfilter/vf_libplacebo.c
+++ b/libavfilter/vf_libplacebo.c
@@ -195,6 +195,7 @@ typedef struct LibplaceboContext {
int color_primaries;
int color_trc;
int rotation;
+ int alpha_mode;
AVDictionary *extra_opts;
#if PL_API_VER >= 351
@@ -920,6 +921,11 @@ static int output_frame(AVFilterContext *ctx, int64_t pts)
if (s->color_primaries >= 0)
out->color_primaries = s->color_primaries;
+ if (outdesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
+ if (s->alpha_mode >= 0)
+ out->alpha_mode = s->alpha_mode;
+ }
+
/* Strip side data if no longer relevant */
if (out->width != ref->width || out->height != ref->height)
changed |= AV_SIDE_DATA_PROP_SIZE_DEPENDENT;
@@ -1475,6 +1481,13 @@ static const AVOption libplacebo_options[] = {
{"270", NULL, 0, AV_OPT_TYPE_CONST,
{.i64=PL_ROTATION_270}, .flags = STATIC, .unit = "rotation"},
{"360", NULL, 0, AV_OPT_TYPE_CONST,
{.i64=PL_ROTATION_360}, .flags = STATIC, .unit = "rotation"},
+ {"alpha_mode", "select alpha moda", OFFSET(alpha_mode), AV_OPT_TYPE_INT,
{.i64=-1}, -1, AVALPHA_MODE_NB-1, DYNAMIC, .unit = "alpha_mode"},
+ {"auto", "keep the same alpha mode", 0, AV_OPT_TYPE_CONST, {.i64=-1},
0, 0, DYNAMIC, .unit = "alpha_mode"},
+ {"unspecified", NULL, 0, AV_OPT_TYPE_CONST,
{.i64=AVALPHA_MODE_UNSPECIFIED}, 0, 0, DYNAMIC, .unit = "alpha_mode"},
+ {"unknown", NULL, 0, AV_OPT_TYPE_CONST,
{.i64=AVALPHA_MODE_UNSPECIFIED}, 0, 0, DYNAMIC, .unit = "alpha_mode"},
+ {"premultiplied", NULL, 0, AV_OPT_TYPE_CONST,
{.i64=AVALPHA_MODE_PREMULTIPLIED}, 0, 0, DYNAMIC, .unit = "alpha_mode"},
+ {"straight", NULL, 0, AV_OPT_TYPE_CONST,
{.i64=AVALPHA_MODE_STRAIGHT}, 0, 0, DYNAMIC, .unit = "alpha_mode"},
+
{ "upscaler", "Upscaler function", OFFSET(upscaler), AV_OPT_TYPE_STRING,
{.str = "spline36"}, .flags = DYNAMIC },
{ "downscaler", "Downscaler function", OFFSET(downscaler),
AV_OPT_TYPE_STRING, {.str = "mitchell"}, .flags = DYNAMIC },
{ "frame_mixer", "Frame mixing function", OFFSET(frame_mixer),
AV_OPT_TYPE_STRING, {.str = "none"}, .flags = DYNAMIC },
--
2.50.1
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