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avfilter/ass: add shaping option 

The documentation is mostly based on ass.h public header.
This commit is contained in:
Clément Bœsch 2014-09-11 21:10:43 +02:00
parent 8a9c5db29e
commit 4b58349bc8
3 changed files with 28 additions and 1 deletions
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20
doc/filters.texi
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@ -2552,6 +2552,26 @@ Same as the @ref{subtitles} filter, except that it doesn't require libavcodec
and libavformat to work. On the other hand, it is limited to ASS (Advanced
Substation Alpha) subtitles files.
This filter accepts the following option in addition to the common options from
the @ref{subtitles} filter:
@table @option
@item shaping
Set the shaping engine
Available values are:
@table @samp
@item auto
The default libass shaping engine, which is the best available.
@item simple
Fast, font-agnostic shaper that can do only substitutions
@item complex
Slower shaper using OpenType for substitutions and positioning
@end table
The default is @code{auto}.
@end table
@section bbox
Compute the bounding box for the non-black pixels in the input frame

2
libavfilter/version.h
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@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 5
#define LIBAVFILTER_VERSION_MINOR 1
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

7
libavfilter/vf_subtitles.c
View File

@ -55,6 +55,7 @@ typedef struct {
uint8_t rgba_map[4];
int pix_step[4]; ///< steps per pixel for each plane of the main output
int original_w, original_h;
int shaping;
FFDrawContext draw;
} AssContext;
@ -141,6 +142,8 @@ static int config_input(AVFilterLink *inlink)
if (ass->original_w && ass->original_h)
ass_set_aspect_ratio(ass->renderer, (double)inlink->w / inlink->h,
(double)ass->original_w / ass->original_h);
if (ass->shaping != -1)
ass_set_shaper(ass->renderer, ass->shaping);
return 0;
}
@ -207,6 +210,10 @@ static const AVFilterPad ass_outputs[] = {
static const AVOption ass_options[] = {
COMMON_OPTIONS
{"shaping", "set shaping engine", OFFSET(shaping), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, FLAGS, "shaping_mode"},
{"auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
{"simple", "simple shaping", 0, AV_OPT_TYPE_CONST, {.i64 = ASS_SHAPING_SIMPLE}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
{"complex", "complex shaping", 0, AV_OPT_TYPE_CONST, {.i64 = ASS_SHAPING_COMPLEX}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
{NULL},
};