Oma
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- Extension: oma, omg
- Company: Sony
Container format used to encapsulate ATRAC3 and ATRAC3+ for use with Sony's portable players. Files ending with .omg are protected with the OpenMG DRM system.
The OMA file format contains a payload scrambled with a 32-bit value [1]. The format is known to carry MP3 and ATRAC3 audio. The metadata format is a variant of ID3v2 and uses standard ID3v2 frame types, such as TIT2, TPE1, TALB and TCON. In addition to these standard frame types, TXXX and GEOB frames contain OpenMG-specific metadata.
TXX OMG_TRACK "track number (ASCII)" TXX OMG_AGENR "content description (ASCII)" TXX OMG_ATPE1 "leader performer (ASCII)" GEOB OMG_BLKSI contains a metadata structure. observed strings include: KEYRING EKB SHARE_P_SID REFID GEOB OMG_OLINF binary blob