Soft Works:
> Root commit for adding subtitle filtering capabilities.
> In detail:
>
> - Add type (AVMediaType) field to AVFrame
> Replaces previous way of distinction which was based on checking
> width and height to determine whether a frame is audio or video
> - Add subtitle fields to AVFrame
> - Add new struct AVSubtitleArea, similar to AVSubtitleRect, but different
> allocation logic. Cannot and must not be used interchangeably, hence
> the new struct
>
> Signed-off-by: softworkz <softwo...@hotmail.com>
> ---
> libavutil/Makefile | 1 +
> libavutil/frame.c | 211 ++++++++++++++++++++++++++++++++++++++++-----
> libavutil/frame.h | 78 ++++++++++++++++-
> libavutil/subfmt.c | 50 +++++++++++
> libavutil/subfmt.h | 48 +++++++++++
> 5 files changed, 364 insertions(+), 24 deletions(-)
> create mode 100644 libavutil/subfmt.c
>
> diff --git a/libavutil/subfmt.c b/libavutil/subfmt.c
> new file mode 100644
> index 0000000000..3998a6d486
> --- /dev/null
> +++ b/libavutil/subfmt.c
> @@ -0,0 +1,50 @@
> +/*
> + * 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 <string.h>
> +#include "common.h"
> +#include "subfmt.h"
> +
> +typedef struct SubtitleFmtInfo {
> + enum AVSubtitleType fmt;
> + const char* name;
> +} SubtitleFmtInfo;
This struct is unused now.
> +
> +static const char sub_fmt_info[AV_SUBTITLE_FMT_NB][24] = {
> + [AV_SUBTITLE_FMT_UNKNOWN] = "Unknown subtitle format",
> + [AV_SUBTITLE_FMT_BITMAP] = "Graphical subtitles",
> + [AV_SUBTITLE_FMT_TEXT] = "Text subtitles (plain)",
> + [AV_SUBTITLE_FMT_ASS] = "Text subtitles (ass)",
> +};
> +
> +const char *av_get_subtitle_fmt_name(enum AVSubtitleType sub_fmt)
> +{
> + if (sub_fmt < 0 || sub_fmt >= AV_SUBTITLE_FMT_NB)
> + return NULL;
> + return sub_fmt_info[sub_fmt];
> +}
> +
> +enum AVSubtitleType av_get_subtitle_fmt(const char *name)
> +{
> + for (int i = 0; i < AV_SUBTITLE_FMT_NB; i++)
> + if (!strcmp(sub_fmt_info[i], name))
> + return i;
> + return AV_SUBTITLE_FMT_NONE;
> +}
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