RealAudio atrc

From MultimediaWiki
Jump to navigation Jump to search

Found in some old RealMedia files. The same as the ATRAC3.


In RealMedia files, the ATRAC3 bitstream is scrambled. To unscramble the stream, perform a XOR on every 32 bits in the frame. The hex value to XOR with is 0x537F6103.

Extra data format

In RealMedia files, ATRAC3 extra data has the following format (big-endian order):

INT32	id, always 4
INT16	samples per frame, always 1024 * 2
INT16	delay, not used but always 0x88E
INT16	stereo coding mode, 2 - normal stereo, 0x12 - joint stereo

The length of this data is always 10 bytes.