Snd0.at9: Difference between revisions
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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 (+1 byte 0x00 null terminator) | | 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 | ||
Revision as of 14:39, 31 July 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)
Block Align (384) * Sampling Frequency (48000) / Sample per block (1024) |
| 0x20 | 0x04 | 80 01 00 00 | 384 | block align |
