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Flipnote Files/PPM: Difference between revisions

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/private/ds/app/4B475556/001 - European location
/private/ds/app/4B475556/001 - European location
/private/ds/app/4B475545/001 - North American location


You can save your images in a user folder as long as it's on the same level as the 001 folder.  Clicking on the Choose Folder icon on the top of the View Flipnote / SD Card option gives you a list of normal folders, and you can swap to user folders by selecting the normal button again.  This could possibly be to overcome a limitation in one of the files (possibly the dirmemo2.lst file).
You can save your images in a user folder as long as it's on the same level as the 001 folder.  Clicking on the Choose Folder icon on the top of the View Flipnote / SD Card option gives you a list of normal folders, and you can swap to user folders by selecting the normal button again.  This could possibly be to overcome a limitation in one of the files (possibly the dirmemo2.lst file).
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| 0x0010
| 0x0010
| 2
| 2
| Is locked? - 0 open, 1 locked
| Lock - 0 open, 1 locked
|-
|-
| 0x0012
| 0x0012
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|-  
|-  
| 0x009A
| 0x009A
| 6
| 4
| Unknown - possibly date information
| Date stored as the number of seconds since midnight 1 Jan 2000.
|-  
|-
| 0x009E
| 2
| Filler - 00 00
|-
| 0x00A0
| 0x00A0
| 1536
| 1536
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[[Image:ppm_1.png]] [[Image:ppm_2.png]]
[[Image:ppm_1.png]] [[Image:ppm_2.png]]


You can use pbsds's [[User:Pbsds/PPMtool|PPMtool]] to extract the preview image yourself


==Animation Data Section==
==Animation Data Section==
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|-
|-
| 0000
| 0000
| 4
| 2
| Size of the offset table
| Size of the offset table
|-
| 0002
| 2
| Padding
|-
|-
| 0004
| 0004
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if( useByte == 0 ) // Set the full line to the current paper colour
if( useByte == 0 ) // Set the full line to the current paper colour
        {
memset( outB, paper, 256 );
memset( outB, paper, 256 );
        }
else // Bytes in this line, read and deal with them
else // Bytes in this line, read and deal with them
{
{
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{
{
if( ( data & 0x01 ) == 0x01 )
if( ( data & 0x01 ) == 0x01 )
                                        {
outB[ x ] = invflag == 0 ? pen : paper;
outB[ x ] = invflag == 0 ? pen : paper;
                                        }
else
else
                                        {
outB[ x ] = invflag == 0 ? paper : pen;
outB[ x ] = invflag == 0 ? paper : pen;
 
                                        }
x ++;
x ++;


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if( x < 256 )
if( x < 256 )
                {
memset( &outB[ x ], paper, 256 - x );
memset( &outB[ x ], paper, 256 - x );
                }
}
}


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The outB and inB are pointers to pre-allocated memory blocks, the inB is a pointer to the file, and the outB is the output data block.  The useByte is the 4 bytes that is at the start of the line, if your reading a type 3 line (full raw data) just pass in 0xFFFFFFFF.  The pen and paper values are what was read from the pen and paper information block.
The outB and inB are pointers to pre-allocated memory blocks, the inB is a pointer to the file, and the outB is the output data block.  The useByte is the 4 bytes that is at the start of the line, if your reading a type 3 line (full raw data) just pass in 0xFFFFFFFF.  The pen and paper values are what was read from the pen and paper information block.
==Sound data section==
The position of the sound header is 0x6A0 + AnimationDataSize
{| class="wikitable"
|- style="background-color: #ddd;"
! Length
! Function
! Description
|-
| Framecount
| Sound effect usage.
| Each byte represents a frame. bit #1(from Right to Left) represents Sound effect 1, bit #2 represents Sound effect 2 and bit #3 represents Sound effect 3. the last 5 bits is padding.
|-
| 0 - 3
| Padding
| 0x00 * (0 to 3). Makes the offset to the next value dividable by 4.
|-
| 4
| Size of the background music.
| The size of the background music in bytes in the audio data below. 0x0 if not used/empty.
|-
| 4
| Size of sound effect #1
| The size of the sound effect #1 in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
|-
| 4
| Size of sound effect #2
| The size of the sound effect #3 in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
|-
| 4
| Size of sound effect #3
| The size of the sound effect #3 in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
|-
| 1
| Current Framespeed.
| This is the speed of the flipnote. It's in the range of 1-8. To get the correct value, you must take 8, and subtract the decimal value of this byte.
|-
| 1
| Given Framespeed when BGM was recorded.
| This is the speed of the flipnote when the BGM was recorded/modified. It's in the range of 1-8. This is used to resample the sound to the new speed. To get the correct value, you must take 8, and subtract the decimal value of this byte.
|-
| 14
| Padding
| 0x00 * 14
|}
Then comes the audio data.
*First comes the BGM(if used)
*Then comes sound effect #1(if used)
*Then comes sound effect #2(if used)
*Then comes sound effect #3(if used)
The sound data is 4bit ADPCM with reversed nibbles @ 8kHz.
You can decode the sound yourself with "sox -t ima -N [input] [output]"
==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.
Retrieved from "https://dsibrew.org/wiki/Flipnote_Files/PPM"