@@ -22440,6 +22440,13 @@ Set subtitles stream index. @code{subtitles} filter only.
@item force_style
Override default style or script info parameters of the subtitles. It accepts a
string containing ASS style format @code{KEY=VALUE} couples separated by ",".
+
+@item wrap_unicode
+Break lines according to the Unicode Line Breaking Algorithm. Only available
+since libass version 0x01600010, and whether it's usable depends on the built
+of libass.
+
+The option is enabled by default except for native ASS.
@end table
If the first key is not specified, it is assumed that the first value
@@ -32,7 +32,7 @@
#include "version_major.h"
#define LIBAVFILTER_VERSION_MINOR 8
-#define LIBAVFILTER_VERSION_MICRO 100
+#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
@@ -45,6 +45,8 @@
#include "formats.h"
#include "video.h"
+#define FF_ASS_FEATURE_WRAP_UNICODE (LIBASS_VERSION >= 0x01600010)
+
typedef struct AssContext {
const AVClass *class;
ASS_Library *library;
@@ -61,6 +63,7 @@ typedef struct AssContext {
int original_w, original_h;
int shaping;
FFDrawContext draw;
+ int wrap_unicode;
} AssContext;
#define OFFSET(x) offsetof(AssContext, x)
@@ -271,6 +274,9 @@ static const AVOption subtitles_options[] = {
{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
{"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
{"force_style", "force subtitle style", OFFSET(force_style), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS},
+#if FF_ASS_FEATURE_WRAP_UNICODE
+ {"wrap_unicode", "break lines according to the Unicode Line Breaking Algorithm", OFFSET(wrap_unicode), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, FLAGS },
+#endif
{NULL},
};
@@ -432,6 +438,18 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
if (ret < 0)
goto end;
+#if FF_ASS_FEATURE_WRAP_UNICODE
+ /* Don't overwrite wrap automatically for native ASS */
+ if (ass->wrap_unicode == -1)
+ ass->wrap_unicode = st->codecpar->codec_id != AV_CODEC_ID_ASS;
+ if (ass->wrap_unicode) {
+ ret = ass_track_set_feature(ass->track, ASS_FEATURE_WRAP_UNICODE, 1);
+ if (ret < 0)
+ av_log(ctx, AV_LOG_WARNING,
+ "libass wasn't built with ASS_FEATURE_WRAP_UNICODE support\n");
+ }
+#endif
+
if (ass->force_style) {
char **list = NULL;
char *temp = NULL;