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== Background Music == | == Background Music == | ||
*Sampling Frequency: 48kHz | *Sampling Frequency: 48kHz | ||
*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). | ||
== Format ATRAC9 == | |||
{| class="wikitable" style="text-align: center;" | {| class="wikitable" style="text-align: center;" | ||
| Line 33: | Line 34: | ||
| 0x16 || 0x02 || 02 00 || 2 || Number of channels | | 0x16 || 0x02 || 02 00 || 2 || Number of channels | ||
|- | |- | ||
| 0x18 || 0x04 || 80 BB 00 00 || 48000 (0xBB80) || Sample Frequency | | 0x18 || 0x04 || 80 BB 00 00 || 48000 (0xBB80) || 48 [http://en.wikipedia.org/wiki/Hertz#SI_multiples kHz] Sample Frequency | ||
|- | |- | ||
| 0x1A || 0x04 || 00 00 50 46 || 18000 || Byte rate: 144 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) / Sample per block (1024) | Block Align (384) * Sampling Frequency (48000) / Sample per block (1024) | ||
|- | |- | ||
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|} | |} | ||
<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: | |||
*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}} | {{File Formats}} | ||
<noinclude>[[Category:Main]]</noinclude> | <noinclude>[[Category:Main]]</noinclude> | ||
Revision as of 16:35, 30 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 |
