Flipnote Files/PPM - Revision history

Pbsds: /* Sound data section */

2017-01-08T18:39:13Z

Sound data section

← Older revision		Revision as of 21:39, 8 January 2017
Line 421:		Line 421:


	The sound data ~~seems to be a variant of VOX~~ ADPCM @ ~~around 8KHz~~.		The sound data is 4bit ADPCM with reversed nibbles @ 8kHz.

	~~----~~		You can decode the sound yourself with "sox -t ima -N [input] [output]"

	~~I have yet to figure out how to get rid of~~ the ~~noice when decoding~~ sound~~...~~--[[~~User:Pbsds\|pbsds]~~] ~~17:38, 6 June 2010 (UTC)~~

	==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.

Pbsds: PCM to ADPCM

2014-11-17T20:17:54Z

PCM to ADPCM

← Older revision		Revision as of 23:17, 17 November 2014
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	\|-		\|-
	\| 1		\| 1
	\| ~~Given~~ Framespeed.		\| 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.		\| 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		\| 1
	\| ~~Current~~ Framespeed when BGM was recorded.		\| 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.		\| 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.
	\|-		\|-
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	*Then comes sound effect #3(if used)		*Then comes sound effect #3(if used)

	The sound data ~~appears~~ to be ~~PCM, 1 channel, 8 bits per sample, at 4096 Hz. When played back with these parameters, the audio is quite audible, BUT there is~~ a ~~lot~~ of ~~background hiss~~. ~~Perhaps there is a low pass filter on the DSi audio output?~~
			The sound data seems to be a variant of VOX ADPCM @ around 8KHz.

	----		----

Kfitch42: Remove reference to max size for Background Music. I have found numerous examples with larger sizes.

2013-10-06T12:55:25Z

Remove reference to max size for Background Music. I have found numerous examples with larger sizes.

← Older revision		Revision as of 16:55, 6 October 2013
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	\| 4		\| 4
	\| Size of the background music.		\| Size of the background music.
	\| The size of the background music in bytes in the audio data below~~, max size is 0x2000~~. 0x0 if not used/empty.		\| The size of the background music in bytes in the audio data below. 0x0 if not used/empty.
	\|-		\|-
	\| 4		\| 4

Kfitch42: /* Sound data section */

2013-10-06T12:47:07Z

Sound data section

← Older revision		Revision as of 16:47, 6 October 2013
Line 420:		Line 420:
	*Then comes sound effect #3(if used)		*Then comes sound effect #3(if used)

	~~To decode the~~ sound data, ~~you must multiply each byte by 16 and run it as 32000Hz PCM data~~.		The sound data appears to be PCM, 1 channel, 8 bits per sample, at 4096 Hz. When played back with these parameters, the audio is quite audible, BUT there is a lot of background hiss. Perhaps there is a low pass filter on the DSi audio output?

	----		----

Yellows8: animation offset table sz field is an u16, not u32.

2011-08-17T19:09:50Z

animation offset table sz field is an u16, not u32.

← Older revision		Revision as of 23:09, 17 August 2011
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	\|-		\|-
	\| 0000		\| 0000
	\| 4		\| 2
	\| Size of the offset table		\| Size of the offset table
			\|-
			\| 0002
			\| 2
			\| Padding
	\|-		\|-
	\| 0004		\| 0004

Yellows8: more sound info.

2011-08-17T15:13:46Z

more sound info.

← Older revision		Revision as of 19:13, 17 August 2011
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	\| 4		\| 4
	\| Size of the background music.		\| Size of the background music.
	\| The size of the background music in bytes in the audio data below. ~~0x0000000~~ if not used/~~emtpy~~.		\| The size of the background music in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
	\|-		\|-
	\| 4		\| 4
	\| Size of sound effect #1		\| Size of sound effect #1
	\| The size of the sound effect #1 in bytes in the audio data below. ~~0x0000000~~ if not used/~~emtpy~~.		\| The size of the sound effect #1 in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
	\|-		\|-
	\| 4		\| 4
	\| Size of sound effect #2		\| Size of sound effect #2
	\| The size of the sound effect #3 in bytes in the audio data below. ~~0x0000000~~ if not used/~~emtpy~~.		\| The size of the sound effect #3 in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
	\|-		\|-
	\| 4		\| 4
	\| Size of sound effect #3		\| Size of sound effect #3
	\| The size of the sound effect #3 in bytes in the audio data below. ~~0x0000000~~ if not used/~~emtpy~~.		\| The size of the sound effect #3 in bytes in the audio data below, max size is 0x2000. 0x0 if not used/empty.
	\|-		\|-
	\| 1		\| 1

Yellows8 at 07:14, 17 August 2011

2011-08-17T05:14:02Z

← Older revision		Revision as of 09:14, 17 August 2011
Line 422:		Line 422:
	I have yet to figure out how to get rid of the noice when decoding sound...--[[User:Pbsds\|pbsds]] 17:38, 6 June 2010 (UTC)		I have yet to figure out how to get rid of the noice when decoding sound...--[[User:Pbsds\|pbsds]] 17:38, 6 June 2010 (UTC)

	===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.

Yellows8: signature info added.

2011-08-17T05:13:12Z

signature info added.

← Older revision		Revision as of 09:13, 17 August 2011
Line 421:		Line 421:

	I have yet to figure out how to get rid of the noice when decoding sound...--[[User:Pbsds\|pbsds]] 17:38, 6 June 2010 (UTC)		I have yet to figure out how to get rid of the noice when decoding sound...--[[User:Pbsds\|pbsds]] 17:38, 6 June 2010 (UTC)

			===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.

The2Banned2One at 00:31, 8 September 2010

2010-09-07T22:31:10Z

← Older revision		Revision as of 02:31, 8 September 2010
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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).

Jeroen207: Added brackets. Makes the code more readable.

2010-08-17T17:01:31Z

Added brackets. Makes the code more readable.

← Older revision		Revision as of 21:01, 17 August 2010
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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 ++;

Line 342:		Line 347:

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