Editing Snd0.at9
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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. | ||
== Background Music == | == Background Music == | ||
Format: ATRAC9: | |||
*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). | ||
{| 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;" |'''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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| 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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| 0x16 || 0x02 || 02 00 || 2 || Number of channels | | 0x16 || 0x02 || 02 00 || 2 || Number of channels | ||
|- | |- | ||
| 0x18 || 0x04 || 80 BB 00 00 || 48000 (0xBB80) || | | 0x18 || 0x04 || 80 BB 00 00 || 48000 (0xBB80) || 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 | ||
|- | |- | ||
|} | |} | ||
{{File Formats}} | {{File Formats}} | ||
<noinclude>[[Category:Main]]</noinclude> | <noinclude>[[Category:Main]]</noinclude> |