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avformat: add option to parse/store ID3 PRIV tags in metadata.

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Enables getting access to ID3 PRIV tags from the command-line or metadata API
when demuxing. The PRIV owner is stored as the metadata key prepended with
"id3v2_priv.", and the data is stored as the metadata value. As PRIV tags may
contain arbitrary data, non-printable characters, including NULL bytes, are
escaped as \xXX.

Similarly, any metadata tags that begin with "id3v2_priv." are inserted as ID3
PRIV tags into the output (assuming the format supports ID3). \xXX sequences in
the value are un-escaped to their byte value.

Signed-off-by: wm4 <nfxjfg@googlemail.com>
This commit is contained in:
Richard Shaffer
2018-01-23 09:39:53 -08:00
committed by wm4
parent f0320afab9
commit 8a4cc0a256
5 changed files with 126 additions and 1 deletions
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2
libavformat/utils.c
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@@ -637,6 +637,8 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
goto fail;
if ((ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0)
goto fail;
if ((ret = ff_id3v2_parse_priv(s, &id3v2_extra_meta)) < 0)
goto fail;
} else
av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
}