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Code Issues Releases Activity

avfilter/vf_libplacebo: add an alpha_mode setting

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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.
This commit is contained in:
Niklas Haas
2025-02-19 21:36:58 +01:00
parent dc02514f6b
commit 1c8ca56a88
2 changed files with 18 additions and 0 deletions
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14
libavfilter/vf_libplacebo.c
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@@ -203,6 +203,7 @@ typedef struct LibplaceboContext {
int color_primaries;
int color_trc;
int rotation;
int alpha_mode;
AVDictionary *extra_opts;
#if PL_API_VER >= 351
@@ -962,6 +963,7 @@ static int output_frame(AVFilterContext *ctx, int64_t pts)
out->height = outlink->h;
out->colorspace = outlink->colorspace;
out->color_range = outlink->color_range;
out->alpha_mode = outlink->alpha_mode;
if (s->deinterlace)
out->flags &= ~(AV_FRAME_FLAG_INTERLACED | AV_FRAME_FLAG_TOP_FIELD_FIRST);
@@ -1339,6 +1341,7 @@ static int libplacebo_query_format(const AVFilterContext *ctx,
RET(ff_formats_ref(infmts, &cfg_in[i]->formats));
RET(ff_formats_ref(ff_all_color_spaces(), &cfg_in[i]->color_spaces));
RET(ff_formats_ref(ff_all_color_ranges(), &cfg_in[i]->color_ranges));
RET(ff_formats_ref(ff_all_alpha_modes(), &cfg_in[i]->alpha_modes));
}
RET(ff_formats_ref(outfmts, &cfg_out[0]->formats));
@@ -1350,6 +1353,10 @@ static int libplacebo_query_format(const AVFilterContext *ctx,
outfmts = s->color_range > 0 ? ff_make_formats_list_singleton(s->color_range)
: ff_all_color_ranges();
RET(ff_formats_ref(outfmts, &cfg_out[0]->color_ranges));
outfmts = s->alpha_mode > 0 ? ff_make_formats_list_singleton(s->alpha_mode)
: ff_all_alpha_modes();
RET(ff_formats_ref(outfmts, &cfg_out[0]->alpha_modes));
return 0;
fail:
@@ -1611,6 +1618,13 @@ 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 },