Support and General Use > Audio Playback, Database and Playlists
Enabling 24bit-44.1/48/88.2/96khz playback - iAudio and others?
mcmurray:
I apologise if I have posted this in the wrong section, but I am very new here.
I noticed that the iAudio x5 (and possibly iPod) hardware allows for 24bit playback . My question is, what would need to be done to get Rockbox to play 24bit FLAC files on this player? I'm prepared to do it myself if need be, just need a little guidance on where to look in the source code etc.
Before people ask, yes I can hear and appreciate the difference between 16bit and 24bit, and I have a need for this functionality in a portable player.
Thank you.
saratoga:
--- Quote from: mcmurray on October 15, 2007, 12:03:01 AM ---
I noticed that the iAudio x5 (and possibly iPod) hardware allows for 24bit playback . My question is, what would need to be done to get Rockbox to play 24bit FLAC files on this player? I'm prepared to do it myself if need be, just need a little guidance on where to look in the source code etc.
--- End quote ---
A lot of the codecs already output at 32 bit precision, however I think the playback engine does eventually truncate/dither everything down to 16 bit. You'd have to ask preglow about that to be sure.
That said, no device rockbox runs on (and probably no DAP ever made) has an SNR which is limited by 16 bit resolution, so I don't see a lot of point in using 24 bit sample precision, except maybe a tiny bit of battery saving by eliminating dither for people who actually care about that sort of thing on a DAP. Otherwise there'd be no practical gain that I can see.
--- Quote from: mcmurray on October 15, 2007, 12:03:01 AM ---Before people ask, yes I can hear and appreciate the difference between 16bit and 24bit, and I have a need for this functionality in a portable player.
--- End quote ---
Well, you're out of luck then. However, I am curious where you're getting 24 bit material from.
mcmurray:
My 24bit material is from DVD-Audio and DVD-Video rips, also I have been listening to some taped live music in 24bit format (see www.flacmusic.com) which sounds amazing and more is becoming available every day. I also intend to rip my vinyl collection to 24bit FLAC.
24bit doesn't just provide a better snr than 16 bit, it also provides more resolution (16777216 discrete levels for 24bit as opposed to 65536 levels for 16 bit i.e. much closer to analogue performance), and a higher signal to quantization distortion ratio. Even though the SNR may not be limited by 16bit, the higher resolution will still be noticable (in the same way that vinyl provides very good resolution in spite of poor SNR).
I will try and contact preglow and see what needs to be done.
edit: if you are wondering how I rip DVD-Audio, google "ppcmripper"
lazpete:
Im using and listening to ripped albums at 24 bit 96 khz in flac on my sansa e200. Large but fantastic...
Llorean:
The Sansa still plays back at 16/44, so you're wasting a lot of bits there.
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