ヘッダサイズは固定で7bytes。LPCMデータはビッグエンディアン。
BYTE0 | BYTE1 | BYTE2 | BYTE3 | BYTE4 | BYTE5 | BYTE6 |
10100 | DDD |
NNNNNNNN |
LLLLLLLL |
LLLLLLLL |
E | M | R | NNNNN |
BB | SS | R | CCC |
XXX | YYYYY |
10000DDD(8bits) : sub stream ID 0xA0-A7 (DDD: id) |
NNNNNNNN(8bits) : number of frame headers |
LLL...(16bits) : first access unit pointer (LPCMデータのフレーム先頭位置) |
E : audio emphasis flag (0:off, 1:on) |
M : audio mute flag (0:off, 1:on) |
R : reserved |
NNNNN(5bits) : audio frame number |
BB(2bits) : Bits per sample[bits] (0:16, 1:20, 2:24, 3:reserved) |
SS(2bits) : Sampling frequency[kHz] (0:48, 1:96, etc:reserved) |
CCC(3bits) : number of channels[ch] (CCC + 1) |
XXX(3bits) : dynamic range X (linear gain = 2^(4-(X+(Y/30)))) |
YYYYY(5bits) : dynamic range Y (dB gain = 24.082 - 6.0206 X - 0.2007 Y) |