Flipnote Files/PPM: Difference between revisions
PCM to ADPCM |
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| Line 421: | Line 421: | ||
The sound data | The sound data is 4bit ADPCM with reversed nibbles @ 8kHz. | ||
You can decode the sound yourself with "sox -t ima -N [input] [output]" | |||
==Signature== | ==Signature== | ||
The last 0x10-bytes in a PPM are all-zero. The 0x80 bytes before that is a RSA-1024 SHA-1 signature over the whole PPM, excluding the last 0x90 bytes with the signature. | The last 0x10-bytes in a PPM are all-zero. The 0x80 bytes before that is a RSA-1024 SHA-1 signature over the whole PPM, excluding the last 0x90 bytes with the signature. | ||