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lavfi/subtitles: load attached fonts to libass.

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Videos with complex typesetting usually have font files embedded
as attachment streams. vf_subtitles now finds all attachment
streams with a MIME type associated with fonts and loads them
to libass so it can use them for rendering.

The code was basically ported from mpv's loadfile.c@929793be7

Signed-off-by: Facundo Gaich <facugaich@gmail.com>
This commit is contained in:
Facundo Gaich 2014-04-09 00:18:35 -03:00 committed by Clément Bœsch
parent 88c4e5a049
commit 7e6b3ad693
1 changed files with 52 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
libavfilter/vf_subtitles.c
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@ -107,7 +107,6 @@ static av_cold int init(AVFilterContext *ctx)
return AVERROR(EINVAL);
}
ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
return 0;
}
@ -218,6 +217,9 @@ static av_cold int init_ass(AVFilterContext *ctx)
if (ret < 0)
return ret;
/* Initialize fonts */
ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
ass->track = ass_read_file(ass->library, ass->filename, NULL);
if (!ass->track) {
av_log(ctx, AV_LOG_ERROR,
@ -249,11 +251,34 @@ static const AVOption subtitles_options[] = {
{NULL},
};
static const char *font_mimetypes[] = {
"application/x-truetype-font",
"application/vnd.ms-opentype",
"application/x-font-ttf",
NULL
};
static int attachment_is_font(AVStream * st)
{
const AVDictionaryEntry *tag = NULL;
int n;
tag = av_dict_get(st->metadata, "mimetype", NULL, AV_DICT_MATCH_CASE);
if (tag) {
for (n = 0; font_mimetypes[n]; n++) {
if (av_strcasecmp(font_mimetypes[n], tag->value) == 0)
return 1;
}
}
return 0;
}
AVFILTER_DEFINE_CLASS(subtitles);
static av_cold int init_subtitles(AVFilterContext *ctx)
{
int ret, sid;
int j, ret, sid;
AVDictionary *codec_opts = NULL;
AVFormatContext *fmt = NULL;
AVCodecContext *dec_ctx = NULL;
@ -293,6 +318,31 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
sid = ret;
st = fmt->streams[sid];
/* Load attached fonts */
for (j = 0; j < fmt->nb_streams; j++) {
AVStream *st = fmt->streams[j];
if (st->codec->codec_type == AVMEDIA_TYPE_ATTACHMENT &&
attachment_is_font(st)) {
const AVDictionaryEntry *tag = NULL;
tag = av_dict_get(st->metadata, "filename", NULL,
AV_DICT_MATCH_CASE);
if (tag) {
av_log(ctx, AV_LOG_DEBUG, "Loading attached font: %s\n",
tag->value);
ass_add_font(ass->library, tag->value,
st->codec->extradata,
st->codec->extradata_size);
} else {
av_log(ctx, AV_LOG_WARNING,
"Font attachment has no filename, ignored.\n");
}
}
}
/* Initialize fonts */
ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
/* Open decoder */
dec_ctx = st->codec;
dec = avcodec_find_decoder(dec_ctx->codec_id);