DTS Frame Header

This is just a quick and partial reference to the frame header of a DTS stream. There is no intention to fully explain DTS, for that you should obtain the official documentation.

The part of the header of most interest to DVD is the first 10 bytes

byte 0 byte 1 byte 2 byte 3

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

Sync - 7F FE 80 01

byte 4 byte 5 byte 6 byte 7 byte 8 byte 9

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

ftype short cpf nblks fsize amode sfreq rate mix dynf timef auxf hdcd

ftype indicates the frame type, 1 = normal, 0 = termination.

short the number of core samples by which a termination frame falls short of the normal length of 32 samples.
For a normal frame the value must be 31.

cpf A flag that indicates if a CRC is present if TRUE (1).
This will be FALSE for DVD.

nblks The number less 1 of sample blocks.
This will always be 15 for DVD. This means each frame is 16*32 (512) samples.
At a sampling rate of 48K this translates to 10 and 2/3 milliseconds, or 960 ticks of the 90KHz clock.

fsize The size less 1 of the frame in bytes.
For DVD this will be 1005 (0x3ED) for 768 Kbps streams or 2012 (0x7DC) for 1536 Kbps streams.

amode - Audio Channel Arrangement

value channels arrangement

00 1 A

01 2 A + B (dual mono)

02 2 L + R (stereo)

03 2 (L+R) + (L-R) (sum and difference)

04 2 LT + RT (left and right total)

05 3 C + L + R

06 3 L + R + S

07 4 C + L + R + S

08 4 L + R + SL + SR

09 5 C + L + R + SL + SR

0A 6 CL + CR + L + R + SL + SR

0B 6 C + L + R + LR + RR + OV

0C 6 CF + CR + LF + RF + LR + RR

0D 7 CL + C + CR + L + R + SL + SR

0E 8 CL + CR + L + R + SL1 + SL2 + SR1 + SR2

0F 8 CL + C + CR + L + R + SL + S + SR

10-3F user defined

sfreq - audio sampling rate

value sampling rate

0 invalid

1 8 KHz

2 16 KHz

3 32 KHz

4 invalid

5 invalid

6 11025 Hz

7 22050 Hz

8 44100 Hz

9 invalid

A invalid

B 12 KHz

C 24 KHz

D 48 KHz

E invalid

F invalid

rate This is a coded value for the targeted bitrate of the encoded stream.
For DVD only 2 values are possible:
0F - targeted rate is 768 Kbps, actual rate is 754.5 Kbps
18 - targeted rate is 1536 Kbps, actual rate is 1509.75 Kbps

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byte 4								byte 5								byte 6								byte 7								byte 8								byte 9
7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	2	1	0
ftype	short					cpf	nblks							fsize														amode						sfreq				rate					mix	dynf	timef	auxf	hdcd

ftype	indicates the frame type, 1 = normal, 0 = termination.
short	the number of core samples by which a termination frame falls short of the normal length of 32 samples. For a normal frame the value must be 31.
cpf	A flag that indicates if a CRC is present if TRUE (1). This will be FALSE for DVD.
nblks	The number less 1 of sample blocks. This will always be 15 for DVD. This means each frame is 16*32 (512) samples. At a sampling rate of 48K this translates to 10 and 2/3 milliseconds, or 960 ticks of the 90KHz clock.
fsize	The size less 1 of the frame in bytes. For DVD this will be 1005 (0x3ED) for 768 Kbps streams or 2012 (0x7DC) for 1536 Kbps streams.