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'''A'''daptive '''T'''ransform '''A'''coustic '''C'''oding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony.
'''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 ==
== Background Music ==
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*Number of channels: 1 or 2 (even when ATRAC9 itself supports mono, stereo, 4.0, 5.1 and 7.1)
*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).
*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 ==
== Format ATRAC9 ==
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{| class="wikitable" style="text-align: center;"
{| class="wikitable" style="text-align: center;"
|-
|-
! style="background-color:#564147; color:#FFFFFF;" |'''Offset'''
| style="background-color:#564147; color:#FFFFFF;" |'''Offset'''
! style="background-color:#564147; color:#FFFFFF;" |'''Size'''
| style="background-color:#564147; color:#FFFFFF;" |'''Size'''
! style="background-color:#564147; color:#FFFFFF;" |'''Example'''
| style="background-color:#564147; color:#FFFFFF;" |'''Example'''
! style="background-color:#564147; color:#FFFFFF;" |'''Value (conversion)'''  
| style="background-color:#564147; color:#FFFFFF;" |'''Value (conversion)'''  
! style="background-color:#564147; color:#FFFFFF;" |'''Notes'''
| style="background-color:#564147; color:#FFFFFF;" |'''Notes'''
|-
|-
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">RIFF chunk descriptor</span>
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">RIFF chunk descriptor</span>
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| 0x00 || 0x04 || 52 49 46 46 || "RIFF" || Magic
| 0x00 || 0x04 || 52 49 46 46 || "RIFF" || Magic
|-
|-
| 0x04 || 0x04 || 20 B3 18 00 || 00 18 B3 20 || File Size
| 0x04 || 0x04 || 20 B3 18 00 || 00 18 B3 20 || File Size (+1 byte 0x00 null terminator)
|-
|-
| 0x08 || 0x04 || 57 41 56 45 || "WAVE" || ID
| 0x08 || 0x04 || 57 41 56 45 || "WAVE" || ID
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|-  
|-  
| 0x18 || 0x04 || 80 BB 00 00 || 48000 (0xBB80) || 48 [http://en.wikipedia.org/wiki/Hertz#SI_multiples kHz] Sample Frequency
| 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)
| 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
Block Align (384) * Sampling Frequency (48000) / Sample per block (1024)
{| 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
| 0x20 || 0x04 || 80 01 00 00 || 384 || block align
|-
|-
|}
|}
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