Snd0.at9: Difference between revisions
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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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| 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 | ||
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| 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) / Samples per block (1024) = 18000 | ||
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| 0x20 || 0x02 || 80 01 || 384 || Audio block align | | 0x20 || 0x02 || 80 01 || 384 || Audio block align | ||
Latest revision as of 06:16, 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).
Format ATRAC9[edit | edit source]
| Offset | Size | Example | Value (conversion) | Notes | ||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RIFF chunk descriptor | ||||||||||||||||||||||||||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||||||||||||||||||||
| 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
| ||||||||||||||||||||||||||||||||||||||||||||
| 0x1A | 0x04 | 00 00 50 46 | 18000 | Byte rate: 144 kbps (18000/125 bytes per second)
| ||||||||||||||||||||||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||||||||||||||||||||
