Snd0.at9: Difference between revisions

Latest revision as of 07:16, 3 August 2015

Adaptive Transform Acoustic Coding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony.

Audio middleware such as FMOD and Audiokinetic Wwise support it.

Background Music[edit | edit source]

Sampling Frequency: 48kHz
Number of channels: 1 or 2 (even when ATRAC9 itself supports mono, stereo, 4.0, 5.1 and 7.1)
Limitations: maximum 2MB filesize (similar to PS Vita).

http://gs2-sec.ww.prod.dl.playstation.net/gs2-sec/appkgo/prod/CUSA00001_00/1/i_f10c33e5f30e3b3900a201af324a2a0e3912e843c1090d66e13f378151c1afa1/i/snd0.at9 sample

Format ATRAC9[edit | edit source]

Offset

Size

Example

Value (conversion)

Notes

RIFF chunk descriptor

0x00

0x04

52 49 46 46

"RIFF"

Magic

0x04

20 B3 18 00

00 18 B3 20

File Size

0x08

0x04

57 41 56 45

"WAVE"

ID

fmt sub-chunk

0x0C

0x04

66 6D 74 20

"fmt "

chunk specifying the data format

0x10

0x04

34 00 00 00

52 bytes

fmt chunk size

0x14

0x02

FE FF

FF FE

format tag

0x16

0x02

02 00

2

Number of channels

0x18

0x04

80 BB 00 00

48000 (0xBB80)

48 kHz Sample Frequency

Supported (kHz)
12	24	48 kHz

0x1A

0x04

00 00 50 46

18000

Byte rate: 144 kbps (18000/125 bytes per second)

Block Align (384) * Sampling Frequency (48000) / Samples per block (1024) = 18000

Supported (kilobits per second)
PS4	48	60	72	84	96	120	144	168	192	240	288	300	336	360	420	504
PSVITA	48	60	72	84	96	120	144	168	192

0x20

0x02

80 01

384

Audio block align

0x22

0x02

00 00

0

Quantifying bit number

0x24

0x02

22 00

34

Extension number

0x26

0x02

00 04

1024

Samples per block

0x28

0x04

03 00 00 00

0x03 (00000011)

Channel Mask (position of the speakers)

0x2C

0x10

-

Codec identifier: GUID

0x3C

0x04

01 00 00 00

-

Version

References:

Grey literature:

http://www.minidisc.org/aes_atrac.html

@@ Line 1: / Line 1: @@
+'''A'''daptive '''T'''ransform '''A'''coustic '''C'''oding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony.
+Audio middleware such as FMOD and Audiokinetic Wwise support it.
 == Background Music ==
-Format: ATRAC9 46kHz, 1 or 2 channel (even when ATRAC9 itself supports mono, stereo, 4.0, 5.1 and 7.1)
+*Sampling Frequency: 48kHz
+*Number of channels: 1 or 2 (even when ATRAC9 itself supports mono, stereo, 4.0, 5.1 and 7.1)
+*Limitations: maximum 2MB filesize (similar to PS Vita).
+*http://gs2-sec.ww.prod.dl.playstation.net/gs2-sec/appkgo/prod/CUSA00001_00/1/i_f10c33e5f30e3b3900a201af324a2a0e3912e843c1090d66e13f378151c1afa1/i/snd0.at9 sample
+== Format ATRAC9 ==
+{| class="wikitable" style="text-align: center;"
+|-
+! style="background-color:#564147; color:#FFFFFF;" |'''Offset'''
+! style="background-color:#564147; color:#FFFFFF;" |'''Size'''
+! style="background-color:#564147; color:#FFFFFF;" |'''Example'''
+! style="background-color:#564147; color:#FFFFFF;" |'''Value (conversion)'''
+! style="background-color:#564147; color:#FFFFFF;" |'''Notes'''
+|-
+|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">RIFF chunk descriptor</span>
+|-
+| 0x00 || 0x04 || 52 49 46 46 || "RIFF" || Magic
+|-
+| 0x04 || 0x04 || 20 B3 18 00 || 00 18 B3 20 || File Size
+|-
+| 0x08 || 0x04 || 57 41 56 45 || "WAVE" || ID
+|-
+|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">fmt sub-chunk</span>
+|-
+| 0x0C || 0x04 || 66 6D 74 20 || "fmt " || chunk specifying the data format
+|-
+| 0x10 || 0x04 || 34 00 00 00 || 52 bytes || fmt chunk size
+|-
+| 0x14 || 0x02 || FE FF || FF FE || format tag
+|-
+| 0x16 || 0x02 || 02 00 || 2 || Number of channels
+|-
+| 0x18 || 0x04 || 80 BB 00 00 || 48000 (0xBB80) || 48 [http://en.wikipedia.org/wiki/Hertz#SI_multiples kHz] Sample Frequency
+{| class="wikitable" style="text-align: center;"
+|-
+! colspan="3"| Supported (kHz)
+|-
+| 12 || 24 || 48 kHz
+|-
+|}
+|-
+| 0x1A || 0x04 || 00 00 50 46 || 18000 || Byte rate: 144 [http://en.wikipedia.org/wiki/Data_rate_units#Kilobit_per_second kbps] (18000/125 bytes per second)
+*Block Align (384) * Sampling Frequency (48000) / Samples per block (1024) = 18000
+{| class="wikitable" style="text-align: center;"
+|-
+! colspan="17"| Supported (kilobits per second)
+|-
+| PS4 || 48 || 60 || 72 || 84 || 96 || 120 || 144 || 168 || 192 || 240 || 288 || 300 || 336 || 360 || 420 || 504
+|-
+| PSVITA || 48 || 60 || 72 || 84 || 96 || 120 || 144 || 168 || 192
+|-
+|}
+|-
+| 0x20 || 0x02 || 80 01 || 384 || Audio block align
+|-
+| 0x22 || 0x02 || 00 00 || 0 || Quantifying bit number
+|-
+| 0x24 || 0x02 || 22 00 || 34 || Extension number
+|-
+| 0x26 || 0x02 || 00 04 || 1024 || Samples per block
+|-
+| 0x28 || 0x04 || 03 00 00 00 || 0x03 (00000011) || [[Template:Wave Channel Mask|Channel Mask]] (position of the speakers)
+|-
+| 0x2C || 0x10 || - || - || Codec identifier: {{G|GUID}}
+|-
+| 0x3C || 0x04 || 01 00 00 00 || - || Version
+|-
+|}
+<div style="float:left; width:100%;">
+  <div style="float: left; width: 70px;">[[image:Main allpages.png|References|64x64px|left]]</div>
+  <div style="float:left; width:90%;"><strong>References:</strong><br /><hr><br />
+<div style="border-width: 1px; border-style:dashed; border-color:#000FFF; padding: 10px; background-color:#FFFFF0; color:#000000; ">
+Grey literature:
-Limitations: maximum 2MB filesize, simular to PS Vita
+*http://www.minidisc.org/aes_atrac.html
+</div></div></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
 {{File Formats}}
 <noinclude>[[Category:Main]]</noinclude>

Snd0.at9: Difference between revisions

Latest revision as of 07:16, 3 August 2015

Background Music[edit | edit source]

Format ATRAC9[edit | edit source]

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