[FFmpeg-devel] [PATCH v2] avfilter/vf_subtitles: add wrap_unicode option

["zhilizhao(赵志立)"]

> On May 22, 2023, at 19:03, Lance Wang <lance.lmwang at gmail.com> wrote:
> 
> On Mon, May 22, 2023 at 12:05 PM Zhao Zhili <quinkblack at foxmail.com> wrote:
> 
>> From: Zhao Zhili <zhilizhao at tencent.com>
>> 
>> So CJK can be wrapped automatically.
>> 
>> Signed-off-by: Zhao Zhili <zhilizhao at tencent.com>
>> ---
>> v2: Don't overwrite wrap automatically for native ASS
>> 
>> libavfilter/version.h      |  2 +-
>> libavfilter/vf_subtitles.c | 14 ++++++++++++++
>> 2 files changed, 15 insertions(+), 1 deletion(-)
>> 
>> diff --git a/libavfilter/version.h b/libavfilter/version.h
>> index ba8a6fdab2..08779130f5 100644
>> --- a/libavfilter/version.h
>> +++ b/libavfilter/version.h
>> @@ -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,
>> \
>> diff --git a/libavfilter/vf_subtitles.c b/libavfilter/vf_subtitles.c
>> index 82e140e986..48038cde23 100644
>> --- a/libavfilter/vf_subtitles.c
>> +++ b/libavfilter/vf_subtitles.c
>> @@ -61,6 +61,7 @@ typedef struct AssContext {
>>     int original_w, original_h;
>>     int shaping;
>>     FFDrawContext draw;
>> +    int wrap_unicode;
>> } AssContext;
>> 
>> #define OFFSET(x) offsetof(AssContext, x)
>> @@ -271,6 +272,9 @@ 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 (LIBASS_VERSION >= 0x01600010)
>> +    {"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 +436,16 @@ static av_cold int init_subtitles(AVFilterContext
>> *ctx)
>>     if (ret < 0)
>>         goto end;
>> 
>> +    /* 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);
>> 
> 
> ASS_FEATURE_WRAP_UNICODE  is defined if  LIBASS_VERSION < 0x01600010?

Oops, I should just remove the #else branch but keep the #if in patch v1.

Will fixed it in v3.

> 
> 
>> +        if (ret < 0)
>> +            av_log(ctx, AV_LOG_WARNING,
>> +                   "libass wasn't built with ASS_FEATURE_WRAP_UNICODE
>> support\n");
>> +    }
>> +
>>     if (ass->force_style) {
>>         char **list = NULL;
>>         char *temp = NULL;
>> --
>> 2.25.1
>> 
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