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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2015-06-08 22:04:24 +02:00
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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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2016-05-14 00:24:01 +02:00
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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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2016-05-16 20:56:53 +02:00
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- Vorbis comments and "METADATA_BLOCK_PICTURE" in raw FLAC streams
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2015-06-08 22:04:24 +02:00
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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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2016-11-18 17:09:26 +01:00
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Default value for minimum and maximum padding is zero. Hence the library will almost always have to rewrite
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the entire file to apply changes. To prevent this, set at least the maximum padding to a higher value.
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It is also possible to force rewriting the entire file always.
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2015-12-22 23:54:35 +01:00
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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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2016-01-17 21:38:27 +01:00
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2015-12-22 23:54:35 +01:00
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## Additional features
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2015-08-16 23:36:49 +02:00
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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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2016-08-04 00:16:19 +02:00
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The library is aware of different text encodings and can convert between different encodings using iconv.
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2017-08-21 01:29:32 +02:00
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### Windows specific
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A workaround to support filenames containing non-ASCII characters (despite the lack of an UTF-8
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supporting `std::fstream` under Windows) can be enabled by adding `-DUSE_NATIVE_FILE_BUFFER=ON`
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to the CMake arguments **when building `c++utilities`**. It is *not* sufficient to specify this
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option only when building `tagparser`.
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2015-12-22 23:54:35 +01:00
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## Usage
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2016-08-04 00:16:19 +02:00
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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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2017-05-24 20:00:44 +02:00
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It is recommend to create backups before editing because I can not test whether the library
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works with all kinds of files (when forcing rewrite a backup is always created).
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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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2017-05-06 08:59:57 +02:00
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The tagparser library depends on [c++utilities](https://github.com/Martchus/cpp-utilities) and is built
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in the same way.
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2017-04-15 23:21:16 +02:00
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It also depends on zlib. For checking integrity of testfiles, the OpenSSL crypto
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library is required.
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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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2016-09-14 20:02:08 +02:00
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- Support adding cue-sheet to FLAC files
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