Difference between revisions of "RealAudio atrc"

From MultimediaWiki
Jump to navigation Jump to search
(Create its own page for RealMedia clone of Sony ATRAC3.)
(Tag: Removed redirect)
m (Minor spelling improvements.)
Line 7: Line 7:
 
== Scrambling ==
 
== Scrambling ==
  
In [[RealMedia]] files the 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.
+
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 ==
 
== Extra data format ==
  
In [[RealMedia]] files the extra data is as follows (big-endian order):
+
In [[RealMedia]] files, ATRAC3 extra data has the following format (big-endian order):
  
 
  INT32 id, always 4
 
  INT32 id, always 4

Revision as of 06:31, 29 November 2018

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

Scrambling

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.