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197d2a684b
There are m4a files with regular (non-full) meta atoms. When such a meta atom is not correctly parsed, the subsequent atoms are not recognized and offsets will not be adjusted when atoms are added, which will corrupt the MP4 file. This change will look behind the meta atom to check if the next atom follows directly, i.e. without the four bytes with version and flags as they exist in full atoms. In such a case, these four bytes will not be skipped. Witnesses of this strange format specification are https://leo-van-stee.github.io/ https://github.com/axiomatic-systems/Bento4/blob/v1.6.0-639/Source/C%2B%2B/Core/Ap4ContainerAtom.cpp#L60
TagLib
TagLib Audio Metadata Library
TagLib is a library for reading and editing the metadata of several popular audio formats. Currently it supports both ID3v1 and ID3v2 for MP3 files, Ogg Vorbis comments and ID3 tags in FLAC, MPC, Speex, WavPack, TrueAudio, WAV, AIFF, MP4, APE, and ASF files.
TagLib is distributed under the GNU Lesser General Public License (LGPL) and Mozilla Public License (MPL). Essentially that means that it may be used in proprietary applications, but if changes are made to TagLib they must be contributed back to the project. Please review the licenses if you are considering using TagLib in your project.