Re: Mod music from Fred
- Original Message - From: Stuart Brady [EMAIL PROTECTED] To: sam-users@nvg.ntnu.no Sent: Sunday, March 16, 2003 10:38 PM Subject: Re: Mod music from Fred Ahh, thanks! Does anybody know what was changed in the file formats to allow for this? (I might as well write a converter for it...) As 4 bits of the data was chopped out - i think it will be easier to find the original if you want to play it at full quality.
Re: Mod music from Fred
On Sun, Mar 16, 2003 at 11:31:31PM -, David wrote: - Original Message - From: Stuart Brady [EMAIL PROTECTED] To: sam-users@nvg.ntnu.no Sent: Sunday, March 16, 2003 10:38 PM Subject: Re: Mod music from Fred Ahh, thanks! Does anybody know what was changed in the file formats to allow for this? (I might as well write a converter for it...) As 4 bits of the data was chopped out - i think it will be easier to find the original if you want to play it at full quality. I had already done that - one of them wasn't quite so easy to find. I'm more interested in converting in the other direction. From the sound of it, writing a converter would be a trivial enough task. I'd also like to check all of the modules to see which of them have any 4-bit samples. AFAICS, all I'd really need to know is where each sample is marked as being a 4-bit sample, and which nibble comes first in the sample data. Cheers, -- Stuart Brady
RE: Mod music from Fred
Ged the mod player source and you should find the 'documentation'. If I recall correctly there is a check on the expected file length (number of patterns, number of samples, length of samples) and the actual file length - if the actual file length indicated that it was using 'half' samples then it was treated as such... The reason for chopping down to 4 bits was indeed 'compression' for the unused bits - note that the SAA(I can't even remember its number) actually only produced 3 bit samples... the lowest bit did nothing, so they could have been compressed even more... Stefan -Original Message- From: Stuart Brady [mailto:[EMAIL PROTECTED] Sent: Monday, March 17, 2003 1:35 AM To: sam-users@nvg.ntnu.no Subject: Re: Mod music from Fred On Sun, Mar 16, 2003 at 11:31:31PM -, David wrote: - Original Message - From: Stuart Brady [EMAIL PROTECTED] To: sam-users@nvg.ntnu.no Sent: Sunday, March 16, 2003 10:38 PM Subject: Re: Mod music from Fred Ahh, thanks! Does anybody know what was changed in the file formats to allow for this? (I might as well write a converter for it...) As 4 bits of the data was chopped out - i think it will be easier to find the original if you want to play it at full quality. I had already done that - one of them wasn't quite so easy to find. I'm more interested in converting in the other direction. From the sound of it, writing a converter would be a trivial enough task. I'd also like to check all of the modules to see which of them have any 4-bit samples. AFAICS, all I'd really need to know is where each sample is marked as being a 4-bit sample, and which nibble comes first in the sample data. Cheers, -- Stuart Brady
Re: Mod music from Fred
This is clever, but I have also seen the lossless 1:2 compression of PCM wave data, which would give you the same benefit and keep the 8 bit waves. It works on the basis of derivations and Huffman coding, and obviously it is lossless, so it is not proven to be 1:2, but it usually is. I'd like to see this combined with your 4bit samples. :-) A. - Original Message - From: Stefan Drissen [EMAIL PROTECTED] To: sam-users@nvg.ntnu.no Sent: Monday, March 17, 2003 9:23 AM Subject: RE: Mod music from Fred Ged the mod player source and you should find the 'documentation'. If I recall correctly there is a check on the expected file length (number of patterns, number of samples, length of samples) and the actual file length - if the actual file length indicated that it was using 'half' samples then it was treated as such... The reason for chopping down to 4 bits was indeed 'compression' for the unused bits - note that the SAA(I can't even remember its number) actually only produced 3 bit samples... the lowest bit did nothing, so they could have been compressed even more... Stefan -Original Message- From: Stuart Brady [mailto:[EMAIL PROTECTED] Sent: Monday, March 17, 2003 1:35 AM To: sam-users@nvg.ntnu.no Subject: Re: Mod music from Fred On Sun, Mar 16, 2003 at 11:31:31PM -, David wrote: - Original Message - From: Stuart Brady [EMAIL PROTECTED] To: sam-users@nvg.ntnu.no Sent: Sunday, March 16, 2003 10:38 PM Subject: Re: Mod music from Fred Ahh, thanks! Does anybody know what was changed in the file formats to allow for this? (I might as well write a converter for it...) As 4 bits of the data was chopped out - i think it will be easier to find the original if you want to play it at full quality. I had already done that - one of them wasn't quite so easy to find. I'm more interested in converting in the other direction. From the sound of it, writing a converter would be a trivial enough task. I'd also like to check all of the modules to see which of them have any 4-bit samples. AFAICS, all I'd really need to know is where each sample is marked as being a 4-bit sample, and which nibble comes first in the sample data. Cheers, -- Stuart Brady
Re: Mod music from Fred
Btw, some of the modules seem to have problems on anything but the SAM mod player. Would anyone have any guess as to why this is? Some of the mods were converted to 4 bit samples, to reduce the overall file size as the extra resolution wasn't required at the time when using only the SAA1099 for playback. Colin Quazar : Hardware, Software, Spares and Repairs for the Sam Website: http://www.quazar.clara.net/sam/ Issue Four of Sam Revival Magazine Out Now !
Re: Mod music from Fred
On Sun, Mar 16, 2003 at 09:28:47PM -, Colin Piggot wrote: Btw, some of the modules seem to have problems on anything but the SAM mod player. Would anyone have any guess as to why this is? Some of the mods were converted to 4 bit samples, to reduce the overall file size as the extra resolution wasn't required at the time when using only the SAA1099 for playback. Ahh, thanks! Does anybody know what was changed in the file formats to allow for this? (I might as well write a converter for it...) -- Stuart Brady
