Snd0.at9: Difference between revisions
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{| class="wikitable" style="text-align: center;" | {| class="wikitable" style="text-align: center;" | ||
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! 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> | |colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">RIFF chunk descriptor</span> | ||
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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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{| 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) / | *Block Align (384) * Sampling Frequency (48000) / Samples per block (1024) = 18000 | ||
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{| 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 | ||
|- | |- | ||
|} | |} | ||
Revision as of 09:10, 13 October 2014
Adaptive Transform Acoustic Coding (ATRAC) is a family of proprietary audio compression algorithms developed by Sony.
Background Music
- 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
| 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 (+1 byte 0x00 null terminator?) |
| 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 |
