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LibAudio: Detect and read FLAC metadata

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FLAC uses the very simple vorbis comment metadata format, which we can
now read most standard and non-standard fields from.
This commit is contained in:
kleines Filmröllchen 2023-03-07 16:58:01 +01:00 • committed by Tim Flynn
parent d8e8ddedf3
commit a8963a270f
5 changed files with 160 additions and 1 deletions
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122
Userland/Libraries/LibAudio/VorbisComment.cpp Normal file
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/*
* Copyright (c) 2023, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "VorbisComment.h"
#include <AK/Endian.h>
#include <AK/MemoryStream.h>
#include <AK/Span.h>
#include <AK/String.h>
namespace Audio {
// "Content vector format"
static ErrorOr<void> read_vorbis_field(Metadata& metadata_to_write_into, String const& unparsed_user_comment)
{
// Technically the field name has to be ASCII, but we just accept all UTF-8.
auto field_name_and_contents = TRY(unparsed_user_comment.split_limit('=', 2));
if (field_name_and_contents.size() != 2)
return Error::from_string_view("User comment does not contain '='"sv);
auto contents = field_name_and_contents.take_last();
auto field_name = TRY(field_name_and_contents.take_first().to_uppercase());
// Some of these are taken from https://age.hobba.nl/audio/tag_frame_reference.html
if (field_name == "TITLE"sv) {
if (metadata_to_write_into.title.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.title = contents;
} else if (field_name == "VERSION"sv) {
if (metadata_to_write_into.subtitle.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.subtitle = contents;
} else if (field_name == "ALBUM"sv) {
if (metadata_to_write_into.album.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.album = contents;
} else if (field_name == "COPYRIGHT"sv) {
if (metadata_to_write_into.copyright.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.copyright = contents;
} else if (field_name == "ISRC"sv) {
if (metadata_to_write_into.isrc.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.isrc = contents;
} else if (field_name == "GENRE"sv) {
if (metadata_to_write_into.genre.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.genre = contents;
} else if (field_name == "COMMENT"sv) {
if (metadata_to_write_into.comment.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.comment = contents;
} else if (field_name == "TRACKNUMBER"sv) {
if (metadata_to_write_into.track_number.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else if (auto maybe_number = contents.to_number<unsigned>(); maybe_number.has_value())
metadata_to_write_into.track_number = maybe_number.release_value();
else
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
} else if (field_name == "DATE"sv) {
if (metadata_to_write_into.unparsed_time.has_value())
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
else
metadata_to_write_into.unparsed_time = contents;
} else if (field_name == "PERFORMER"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Performer, contents));
} else if (field_name == "ARTIST"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Artist, contents));
} else if (field_name == "COMPOSER"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Composer, contents));
} else if (field_name == "CONDUCTOR"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Conductor, contents));
} else if (field_name == "LYRICIST"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Lyricist, contents));
} else if (field_name == "ORGANIZATION"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Publisher, contents));
} else if (field_name == "PUBLISHER"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Publisher, contents));
} else if (field_name == "ENCODED-BY"sv) {
TRY(metadata_to_write_into.add_person(Person::Role::Engineer, contents));
} else {
TRY(metadata_to_write_into.add_miscellaneous(field_name, contents));
}
return {};
}
ErrorOr<Metadata, LoaderError> load_vorbis_comment(ByteBuffer const& vorbis_comment)
{
FixedMemoryStream stream { vorbis_comment };
auto vendor_length = TRY(stream.read_value<LittleEndian<u32>>());
Vector<u8> raw_vendor_string;
TRY(raw_vendor_string.try_resize(vendor_length));
TRY(stream.read_entire_buffer(raw_vendor_string));
auto vendor_string = TRY(String::from_utf8(StringView { raw_vendor_string.span() }));
Metadata metadata;
metadata.encoder = move(vendor_string);
auto user_comment_count = TRY(stream.read_value<LittleEndian<u32>>());
for (size_t i = 0; i < user_comment_count; ++i) {
auto user_comment_length = TRY(stream.read_value<LittleEndian<u32>>());
Vector<u8> raw_user_comment;
TRY(raw_user_comment.try_resize(user_comment_length));
TRY(stream.read_entire_buffer(raw_user_comment));
auto unparsed_user_comment = TRY(String::from_utf8(StringView { raw_user_comment.span() }));
TRY(read_vorbis_field(metadata, unparsed_user_comment));
}
return metadata;
}
}