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 == | ||
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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). | ||
== 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 |