2015-08-16 23:39:42 +02:00
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# Tag Parser
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2016-05-16 20:56:53 +02:00
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C++ library for reading and writing MP4 (iTunes), ID3, Vorbis, Opus, FLAC and Matroska tags.
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2015-05-19 22:53:17 +02:00
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2015-06-08 22:04:24 +02:00
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## Supported formats
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The tag library can read and write the following tag formats:
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- iTunes-style MP4/M4A tags (MP4-DASH is supported)
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- ID3v1 and ID3v2 tags
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- conversion between ID3v1 and different versions of ID3v2 is possible
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- Vorbis, Opus and FLAC comments in Ogg streams
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- cover art via "METADATA_BLOCK_PICTURE" is supported
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- Vorbis comments and "METADATA_BLOCK_PICTURE" in raw FLAC streams
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- Matroska/WebM tags and attachments
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2015-12-22 23:54:35 +01:00
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## File layout options
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### Tag position
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The library allows you to choose whether tags should be placed at the beginning or at
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the end of an MP4/Matroska file.
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### Padding
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Padding allows adding additional tag information without rewriting the entire file
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or appending the tag. Usage of padding can be configured:
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- minimum/maximum padding: The file is rewritten if the padding would fall below/exceed the specifed limits.
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- preferred padding: If the file needs to be rewritten the preferred padding is used.
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However, it is also possible to force rewriting the entire file.
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2016-09-10 17:17:32 +02:00
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Taking advantage of padding is currently not supported when dealing with Ogg streams (it is supported when dealing with raw FLAC streams).
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2015-12-22 23:54:35 +01:00
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## Additional features
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The library can also display technical information such as the ID, format, language, bitrate,
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duration, size, timestamps, sampling frequency, FPS and other information of the tracks.
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2015-06-08 22:04:24 +02:00
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It also allows to inspect and validate the element structure of MP4 and Matroska files.
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2015-12-27 18:06:01 +01:00
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## Text encoding, Unicode support
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The library is aware of different text encodings and can convert between different encodings using iconv.
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2015-12-22 23:54:35 +01:00
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## Usage
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For examples check out the command line interface of [Tag Editor](https://github.com/Martchus/tageditor).
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API documentation can be generated using Doxygen with `make tagparser_apidoc`.
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2015-06-08 22:04:24 +02:00
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2015-12-27 18:06:01 +01:00
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## Bugs, stability
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- Matroska files composed of more than one segment aren't tested yet and might not work
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- It is recommend you to create backups before editing because I can not test whether the library works with all kind of files
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2015-12-27 18:06:01 +01:00
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2015-05-19 22:53:17 +02:00
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## Build instructions
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The tagparser library depends on c++utilities and is built in the same way.
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It also depends on zlib.
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2015-08-16 23:39:42 +02:00
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## TODO
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2016-09-10 17:17:32 +02:00
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- Support more formats (EXIF, PDF metadata, Theora, ...)
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- Do tests with Matroska files which have multiple segments
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2016-09-14 20:02:08 +02:00
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- Support adding cue-sheet to FLAC files
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