Soft Works:
> Analog to avfilter/video.c and avfilter/audio.c
>
> Signed-off-by: softworkz <softwo...@hotmail.com>
> ---
> libavfilter/Makefile | 1 +
> libavfilter/avfilter.c | 4 +++
> libavfilter/internal.h | 1 +
> libavfilter/subtitles.c | 61 +++++++++++++++++++++++++++++++++++++++++
> libavfilter/subtitles.h | 44 +++++++++++++++++++++++++++++
> 5 files changed, 111 insertions(+)
> create mode 100644 libavfilter/subtitles.c
> create mode 100644 libavfilter/subtitles.h
>
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index f059f3fef8..041d3c5382 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -19,6 +19,7 @@ OBJS = allfilters.o
> \
> framequeue.o \
> graphdump.o \
> graphparser.o \
> + subtitles.o \
> video.o \
>
> OBJS-$(HAVE_THREADS) += pthread.o
> diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
> index f325918021..ef349a67f9 100644
> --- a/libavfilter/avfilter.c
> +++ b/libavfilter/avfilter.c
> @@ -43,6 +43,7 @@
> #include "formats.h"
> #include "framepool.h"
> #include "internal.h"
> +#include "subtitles.h"
>
> #include "libavutil/ffversion.h"
> const char av_filter_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
> @@ -1476,6 +1477,9 @@ int ff_inlink_make_frame_writable(AVFilterLink *link,
> AVFrame **rframe)
> case AVMEDIA_TYPE_AUDIO:
> out = ff_get_audio_buffer(link, frame->nb_samples);
> break;
> + case AVMEDIA_TYPE_SUBTITLE:
> + out = ff_get_subtitles_buffer(link, link->format);
> + break;
> default:
> return AVERROR(EINVAL);
> }
> diff --git a/libavfilter/internal.h b/libavfilter/internal.h
> index e7c154aff0..8977dda2b3 100644
> --- a/libavfilter/internal.h
> +++ b/libavfilter/internal.h
> @@ -90,6 +90,7 @@ struct AVFilterPad {
> union {
> AVFrame *(*video)(AVFilterLink *link, int w, int h);
> AVFrame *(*audio)(AVFilterLink *link, int nb_samples);
> + AVFrame *(*subtitle)(AVFilterLink *link, int format);
> } get_buffer;
>
> /**
> diff --git a/libavfilter/subtitles.c b/libavfilter/subtitles.c
> new file mode 100644
> index 0000000000..fd2e7c3c0f
> --- /dev/null
> +++ b/libavfilter/subtitles.c
> @@ -0,0 +1,61 @@
> +/*
> + * Copyright (c) 2021 softworkz
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
> USA
> + */
> +
> +#include "libavutil/common.h"
> +
> +#include "subtitles.h"
> +#include "avfilter.h"
> +#include "internal.h"
> +
> +
> +AVFrame *ff_null_get_subtitles_buffer(AVFilterLink *link, int format)
> +{
> + return ff_get_subtitles_buffer(link->dst->outputs[0], format);
> +}
> +
> +AVFrame *ff_default_get_subtitles_buffer(AVFilterLink *link, int format)
> +{
> + AVFrame *frame;
> +
> + frame = av_frame_alloc();
> + if (!frame)
> + return NULL;
> +
> + frame->format = format;
> + frame->type = AVMEDIA_TYPE_SUBTITLE;
> +
> + if (av_frame_get_buffer2(frame, 0) < 0)
Leak.
> + return NULL;
> +
> + return frame;
> +}
> +
> +AVFrame *ff_get_subtitles_buffer(AVFilterLink *link, int format)
> +{
> + AVFrame *ret = NULL;
> +
> + if (link->dstpad->get_buffer.subtitle)
> + ret = link->dstpad->get_buffer.subtitle(link, format);
> +
> + if (!ret)
> + ret = ff_default_get_subtitles_buffer(link, format);
> +
> + return ret;
> +}
> diff --git a/libavfilter/subtitles.h b/libavfilter/subtitles.h
> new file mode 100644
> index 0000000000..d3d5491652
> --- /dev/null
> +++ b/libavfilter/subtitles.h
> @@ -0,0 +1,44 @@
> +/*
> + * Copyright (c) 2021 softworkz
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
> USA
> + */
> +
> +#ifndef AVFILTER_SUBTITLES_H
> +#define AVFILTER_SUBTITLES_H
> +
> +#include "avfilter.h"
> +#include "internal.h"
> +
> +/** default handler for get_subtitles_buffer() for subtitle inputs */
> +AVFrame *ff_default_get_subtitles_buffer(AVFilterLink *link, int format);
> +
> +/** get_subtitles_buffer() handler for filters which simply pass subtitles
> along */
> +AVFrame *ff_null_get_subtitles_buffer(AVFilterLink *link, int format);
> +
> +/**
> + * Request a subtitles buffer with a specific set of permissions.
> + *
> + * @param link the output link to the filter from which the buffer
> will
> + * be requested
> + * @param format The subtitles format.
> + * @return A reference to the subtitles. This must be
> unreferenced with
> + * avfilter_unref_buffer when you are finished with it.
avfilter_unref_buffer?
> +*/
> +AVFrame *ff_get_subtitles_buffer(AVFilterLink *link, int format);
> +
> +#endif /* AVFILTER_SUBTITLES_H */
>
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